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Basic Python Object

without comments

One of my students wanted a quick example of a Python object with getters and setters. So, I wrote a little example that I’ll share.

You define this file in a physical directory that is in your $PYTHONPATH, like this:

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# Define Coordinate class.
class Coordinate:
  # The method that initializes the Coordinate class.
  def __init__ (self, x, y):
    self.x = x
    self.y = y
 
  # Gets the x value from the instance.
  def getX (self):
    return self.x
 
  # Gets the y value from the instance.
  def getY (self):
    return self.y
 
  # Sets the x value in the instance.
  def setX (self, x):
    self.x = x
 
  # Sets the y value in the instance.    
  def setY (self, y):
    self.y = y
 
  # Prints the coordinate pair.
  def printCoordinate(self):
    print (self.x, self.y)

Assuming the file name is Coordinate.py, you can put it into the Python Idle environment with the following command:

from Coordinate import Coordinate

You initialize the class, like this:

g = Coordinate(49,49)

Then, you can access the variables of the class or it’s methods as shown below:

# Print the retrieved value of x from the g instance of the Coordinate class.
print g.getX()
 
# Print the formatted and retrieved value of x from the g instance of the Coordinate class.
print "[" + str(g.getX()) + "]"
 
# Set the value of x inside the g instance of the Coordinate class.
print g.setX(39)
 
# Print the Coordinates as a set.
g.printCoordinate()

You would see the following results:

49
[49]
(39,49)

As always, I hope that helps those looking for a solution.

Written by maclochlainn

October 30th, 2016 at 6:23 pm

Can’t Display 256 Colors

without comments

If you’re reading this post, you most likely are trying to run the Oracle Database 11g or 12c runInstaller program, and it’s failing a critical dependency check and displaying an error like the one below. If so, choose n because if you choose y it won’t launch the Oracle Installer.

Starting Oracle Universal Installer...
 
Checking Temp space: must be greater than 500 MB.   Actual 30824 MB    Passed
Checking swap space: must be greater than 150 MB.   Actual 3967 MB    Passed
Checking monitor: must be configured to display at least 256 colors
    >>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.    Failed <<<<
 
Some requirement checks failed. You must fulfill these requirements before
 
continuing with the installation,
 
Continue? (y/n) [n] n

The first thing to check is whether you’ve the $TERM environment variable. It’ll be set in your env list but may not be set in your .bashrc file. You can see whether it’s set by running the following command:

echo $TERM

It should return a value, like this:

xterm-256color

If you didn’t get that value, use the env command to lookup the $TERM. The correct value can be found by running the env command like this:

env | grep -i term

Add $TERM environment variable to your .bashrc file and source it after the change or reboot the user’s session:

export TERM=xterm-256color

If it still doesn’t work, some posts ask you to run xclock but you don’t generally install the xhost clients. Those articles assumes you’ve installed the xorg-x11-apps package library. That’s more or less a choice you made when installing the Linux OS. You can check for the presence of the library with the following command as the root user:

rpm -qa xorg-x11-apps

If the command fails to return a result from the search of Red Hat Package Manager (RPM) libraries, you haven’t installed it. You can install it as the root superuser with this syntax:

yum install -y xorg-x11-apps

It should display the following result when successful:

Loaded plugins: langpacks
Resolving Dependencies
--> Running transaction check
---> Package xorg-x11-apps.x86_64 0:7.7-6.el7 will be installed
--> Processing Dependency: libXaw.so.7()(64bit) for package: xorg-x11-apps-7.7-6.el7.x86_64
--> Running transaction check
---> Package libXaw.x86_64 0:1.0.12-5.el7 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
=================================================================================
 Package              Arch          Version              Repository         Size
=================================================================================
Installing:
 xorg-x11-apps        x86_64        7.7-6.el7            ol7_latest        304 k
Installing for dependencies:
 libXaw               x86_64        1.0.12-5.el7         ol7_latest        190 k
 
Transaction Summary
=================================================================================
Install  1 Package (+1 Dependent package)
 
Total download size: 494 k
Installed size: 1.2 M
Downloading packages:
(1/2): libXaw-1.0.12-5.el7.x86_64.rpm                     | 190 kB  00:00:00     
(2/2): xorg-x11-apps-7.7-6.el7.x86_64.rpm                 | 304 kB  00:00:00     
---------------------------------------------------------------------------------
Total                                            690 kB/s | 494 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : libXaw-1.0.12-5.el7.x86_64                                    1/2 
  Installing : xorg-x11-apps-7.7-6.el7.x86_64                                2/2 
  Verifying  : libXaw-1.0.12-5.el7.x86_64                                    1/2 
  Verifying  : xorg-x11-apps-7.7-6.el7.x86_64                                2/2 
 
Installed:
  xorg-x11-apps.x86_64 0:7.7-6.el7                                               
 
Dependency Installed:
  libXaw.x86_64 0:1.0.12-5.el7                                                   
 
Complete!

After installing the xorg-x11-apps library packages, you can retry running the Oracle installer. You should now see the following successful message set:

Starting Oracle Universal Installer...
 
Checking Temp space: must be greater than 500 MB.   Actual 30809 MB    Passed
Checking swap space: must be greater than 150 MB.   Actual 3967 MB    Passed
Checking monitor: must be configured to display at least 256 colors.    Actual 16777216    Passed
Preparing to launch Oracle Universal Installer from /tmp/OraInstall2016-06-01_01-50-54AM. Please wait ...

As always, I hope this helps my students and anybody looking for a solution to a less than explicit error message.

Written by maclochlainn

June 1st, 2016 at 2:12 am

Oracle 12c Pre-requisites

without comments

Installing any Oracle database is tedious, but the installing the prerequisites can be especially tedious. This post tries to simplify the process by creating a single prereq.sh file for all the prerequisite libraries, except for the oracle-rdbms-server-12cR1-preinstall, which you should run after the prerequisite file.

The prerequisite file should contain the following:

yum install -y binutils \
               compat-libstdc++-33 \
               compat-libstdc++-33.i686 \
               gcc \
               gcc-c++ \
               glibc \
               glibc.i686 \
               glibc-devel \
               glibc-devel.i686 \
               ksh \
               libgcc \
               libgcc.i686 \
               libstdc++ \
               libstdc++.i686 \
               libstdc++-devel \
               libstdc++-devel.i686 \
               libaio \
               libaio.i686 \
               libaio-devel \
               libaio-devel.i686 \
               libXext \
               libXext.i686 \
               libXtst \
               libXtst.i686 \
               libX11 \
               libX11.i686 \
               libXau \
               libXau.i686 \
               libxcb \
               libxcb.i686 \
               libXi \
               libXi.i686 \
               make \
               sysstat \
               unixODBC \
               unixODBC-devel \
               zlib-devel \
               zlib-devel.i686

You can run the prereq.sh script as the root user like you would source an environment file:

. ./prereq.sh

Dependent upon what you installed when creating the Oracle Linux 7.1 operating system, you should see something like this in the output console:

sh-4.2# . ./prereq.sh
Loaded plugins: langpacks
Package compat-libstdc++-33-3.2.3-72.el7.x86_64 already installed and latest version
Package libXtst-1.2.2-2.1.el7.x86_64 already installed and latest version
Package libXau-1.0.8-2.1.el7.x86_64 already installed and latest version
Package 1:make-3.82-21.el7.x86_64 already installed and latest version
Package sysstat-10.1.5-7.el7.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package binutils.x86_64 0:2.23.52.0.1-30.el7_1.2 will be updated
---> Package binutils.x86_64 0:2.23.52.0.1-55.el7 will be an update
---> Package compat-libstdc++-33.i686 0:3.2.3-72.el7 will be installed
---> Package gcc.x86_64 0:4.8.3-9.el7 will be updated
--> Processing Dependency: gcc = 4.8.3-9.el7 for package: gcc-gfortran-4.8.3-9.el7.x86_64
--> Processing Dependency: gcc = 4.8.3-9.el7 for package: libquadmath-devel-4.8.3-9.el7.x86_64
---> Package gcc.x86_64 0:4.8.5-4.el7 will be an update
--> Processing Dependency: cpp = 4.8.5-4.el7 for package: gcc-4.8.5-4.el7.x86_64
--> Processing Dependency: libgomp = 4.8.5-4.el7 for package: gcc-4.8.5-4.el7.x86_64
---> Package gcc-c++.x86_64 0:4.8.3-9.el7 will be updated
---> Package gcc-c++.x86_64 0:4.8.5-4.el7 will be an update
---> Package glibc.x86_64 0:2.17-78.0.1.el7 will be updated
--> Processing Dependency: glibc = 2.17-78.0.1.el7 for package: glibc-headers-2.17-78.0.1.el7.x86_64
--> Processing Dependency: glibc = 2.17-78.0.1.el7 for package: glibc-common-2.17-78.0.1.el7.x86_64
---> Package glibc.i686 0:2.17-106.0.1.el7_2.6 will be installed
--> Processing Dependency: libfreebl3.so for package: glibc-2.17-106.0.1.el7_2.6.i686
--> Processing Dependency: libfreebl3.so(NSSRAWHASH_3.12.3) for package: glibc-2.17-106.0.1.el7_2.6.i686
---> Package glibc.x86_64 0:2.17-106.0.1.el7_2.6 will be an update
---> Package glibc-devel.x86_64 0:2.17-78.0.1.el7 will be updated
---> Package glibc-devel.i686 0:2.17-106.0.1.el7_2.6 will be installed
---> Package glibc-devel.x86_64 0:2.17-106.0.1.el7_2.6 will be an update
---> Package ksh.x86_64 0:20120801-22.el7_1.3 will be installed
---> Package libX11.x86_64 0:1.6.0-2.1.el7 will be updated
---> Package libX11.i686 0:1.6.3-2.el7 will be installed
--> Processing Dependency: libX11-common >= 1.6.3-2.el7 for package: libX11-1.6.3-2.el7.i686
---> Package libX11.x86_64 0:1.6.3-2.el7 will be an update
---> Package libXau.i686 0:1.0.8-2.1.el7 will be installed
---> Package libXext.x86_64 0:1.3.2-2.1.el7 will be updated
---> Package libXext.i686 0:1.3.3-3.el7 will be installed
---> Package libXext.x86_64 0:1.3.3-3.el7 will be an update
---> Package libXi.x86_64 0:1.7.2-2.1.el7 will be updated
---> Package libXi.i686 0:1.7.4-2.el7 will be installed
---> Package libXi.x86_64 0:1.7.4-2.el7 will be an update
---> Package libXtst.i686 0:1.2.2-2.1.el7 will be installed
---> Package libaio.x86_64 0:0.3.109-12.el7 will be updated
---> Package libaio.i686 0:0.3.109-13.el7 will be installed
---> Package libaio.x86_64 0:0.3.109-13.el7 will be an update
---> Package libaio-devel.i686 0:0.3.109-13.el7 will be installed
---> Package libaio-devel.x86_64 0:0.3.109-13.el7 will be installed
---> Package libgcc.x86_64 0:4.8.3-9.el7 will be updated
---> Package libgcc.i686 0:4.8.5-4.el7 will be installed
---> Package libgcc.x86_64 0:4.8.5-4.el7 will be an update
---> Package libstdc++.x86_64 0:4.8.3-9.el7 will be updated
---> Package libstdc++.i686 0:4.8.5-4.el7 will be installed
---> Package libstdc++.x86_64 0:4.8.5-4.el7 will be an update
---> Package libstdc++-devel.x86_64 0:4.8.3-9.el7 will be updated
---> Package libstdc++-devel.i686 0:4.8.5-4.el7 will be installed
---> Package libstdc++-devel.x86_64 0:4.8.5-4.el7 will be an update
---> Package libxcb.x86_64 0:1.9-5.el7 will be updated
---> Package libxcb.i686 0:1.11-4.el7 will be installed
---> Package libxcb.x86_64 0:1.11-4.el7 will be an update
---> Package unixODBC.x86_64 0:2.3.1-11.el7 will be installed
---> Package unixODBC-devel.x86_64 0:2.3.1-11.el7 will be installed
---> Package zlib-devel.i686 0:1.2.7-15.el7 will be installed
--> Processing Dependency: zlib = 1.2.7-15.el7 for package: zlib-devel-1.2.7-15.el7.i686
--> Processing Dependency: libz.so.1 for package: zlib-devel-1.2.7-15.el7.i686
---> Package zlib-devel.x86_64 0:1.2.7-15.el7 will be installed
--> Running transaction check
---> Package cpp.x86_64 0:4.8.3-9.el7 will be updated
---> Package cpp.x86_64 0:4.8.5-4.el7 will be an update
---> Package gcc-gfortran.x86_64 0:4.8.3-9.el7 will be updated
---> Package gcc-gfortran.x86_64 0:4.8.5-4.el7 will be an update
--> Processing Dependency: libgfortran = 4.8.5-4.el7 for package: gcc-gfortran-4.8.5-4.el7.x86_64
--> Processing Dependency: libquadmath = 4.8.5-4.el7 for package: gcc-gfortran-4.8.5-4.el7.x86_64
---> Package glibc-common.x86_64 0:2.17-78.0.1.el7 will be updated
---> Package glibc-common.x86_64 0:2.17-106.0.1.el7_2.6 will be an update
---> Package glibc-headers.x86_64 0:2.17-78.0.1.el7 will be updated
---> Package glibc-headers.x86_64 0:2.17-106.0.1.el7_2.6 will be an update
---> Package libX11-common.noarch 0:1.6.0-2.1.el7 will be updated
---> Package libX11-common.noarch 0:1.6.3-2.el7 will be an update
---> Package libgomp.x86_64 0:4.8.3-9.el7 will be updated
---> Package libgomp.x86_64 0:4.8.5-4.el7 will be an update
---> Package libquadmath-devel.x86_64 0:4.8.3-9.el7 will be updated
---> Package libquadmath-devel.x86_64 0:4.8.5-4.el7 will be an update
---> Package nss-softokn-freebl.x86_64 0:3.16.2.3-12.el7_1 will be updated
---> Package nss-softokn-freebl.i686 0:3.16.2.3-14.2.el7_2 will be installed
---> Package nss-softokn-freebl.x86_64 0:3.16.2.3-14.2.el7_2 will be an update
---> Package zlib.x86_64 0:1.2.7-13.el7 will be updated
---> Package zlib.i686 0:1.2.7-15.el7 will be installed
---> Package zlib.x86_64 0:1.2.7-15.el7 will be an update
--> Running transaction check
---> Package libgfortran.x86_64 0:4.8.3-9.el7 will be updated
---> Package libgfortran.x86_64 0:4.8.5-4.el7 will be an update
---> Package libquadmath.x86_64 0:4.8.3-9.el7 will be updated
---> Package libquadmath.x86_64 0:4.8.5-4.el7 will be an update
--> Finished Dependency Resolution
 
Dependencies Resolved
 
================================================================================
 Package                Arch      Version                   Repository     Size
================================================================================
Installing:
 compat-libstdc++-33    i686      3.2.3-72.el7              ol7_latest    196 k
 glibc                  i686      2.17-106.0.1.el7_2.6      ol7_latest    4.2 M
 glibc-devel            i686      2.17-106.0.1.el7_2.6      ol7_latest    1.0 M
 ksh                    x86_64    20120801-22.el7_1.3       ol7_latest    880 k
 libX11                 i686      1.6.3-2.el7               ol7_latest    609 k
 libXau                 i686      1.0.8-2.1.el7             ol7_latest     28 k
 libXext                i686      1.3.3-3.el7               ol7_latest     38 k
 libXi                  i686      1.7.4-2.el7               ol7_latest     39 k
 libXtst                i686      1.2.2-2.1.el7             ol7_latest     19 k
 libaio                 i686      0.3.109-13.el7            ol7_latest     24 k
 libaio-devel           i686      0.3.109-13.el7            ol7_latest     12 k
 libaio-devel           x86_64    0.3.109-13.el7            ol7_latest     12 k
 libgcc                 i686      4.8.5-4.el7               ol7_latest    102 k
 libstdc++              i686      4.8.5-4.el7               ol7_latest    310 k
 libstdc++-devel        i686      4.8.5-4.el7               ol7_latest    1.5 M
 libxcb                 i686      1.11-4.el7                ol7_latest    201 k
 unixODBC               x86_64    2.3.1-11.el7              ol7_latest    412 k
 unixODBC-devel         x86_64    2.3.1-11.el7              ol7_latest     54 k
 zlib-devel             i686      1.2.7-15.el7              ol7_latest     49 k
 zlib-devel             x86_64    1.2.7-15.el7              ol7_latest     49 k
Updating:
 binutils               x86_64    2.23.52.0.1-55.el7        ol7_latest    5.0 M
 gcc                    x86_64    4.8.5-4.el7               ol7_latest     16 M
 gcc-c++                x86_64    4.8.5-4.el7               ol7_latest    7.2 M
 glibc                  x86_64    2.17-106.0.1.el7_2.6      ol7_latest    3.6 M
 glibc-devel            x86_64    2.17-106.0.1.el7_2.6      ol7_latest    1.0 M
 libX11                 x86_64    1.6.3-2.el7               ol7_latest    605 k
 libXext                x86_64    1.3.3-3.el7               ol7_latest     38 k
 libXi                  x86_64    1.7.4-2.el7               ol7_latest     39 k
 libaio                 x86_64    0.3.109-13.el7            ol7_latest     24 k
 libgcc                 x86_64    4.8.5-4.el7               ol7_latest     94 k
 libstdc++              x86_64    4.8.5-4.el7               ol7_latest    297 k
 libstdc++-devel        x86_64    4.8.5-4.el7               ol7_latest    1.5 M
 libxcb                 x86_64    1.11-4.el7                ol7_latest    189 k
Installing for dependencies:
 nss-softokn-freebl     i686      3.16.2.3-14.2.el7_2       ol7_latest    187 k
 zlib                   i686      1.2.7-15.el7              ol7_latest     90 k
Updating for dependencies:
 cpp                    x86_64    4.8.5-4.el7               ol7_latest    5.9 M
 gcc-gfortran           x86_64    4.8.5-4.el7               ol7_latest    6.6 M
 glibc-common           x86_64    2.17-106.0.1.el7_2.6      ol7_latest     11 M
 glibc-headers          x86_64    2.17-106.0.1.el7_2.6      ol7_latest    662 k
 libX11-common          noarch    1.6.3-2.el7               ol7_latest    161 k
 libgfortran            x86_64    4.8.5-4.el7               ol7_latest    292 k
 libgomp                x86_64    4.8.5-4.el7               ol7_latest    130 k
 libquadmath            x86_64    4.8.5-4.el7               ol7_latest    182 k
 libquadmath-devel      x86_64    4.8.5-4.el7               ol7_latest     45 k
 nss-softokn-freebl     x86_64    3.16.2.3-14.2.el7_2       ol7_latest    203 k
 zlib                   x86_64    1.2.7-15.el7              ol7_latest     89 k
 
Transaction Summary
================================================================================
Install  20 Packages (+ 2 Dependent packages)
Upgrade  13 Packages (+11 Dependent packages)
 
Total download size: 71 M
Downloading packages:
No Presto metadata available for ol7_latest
(1/46): compat-libstdc++-33-3.2.3-72.el7.i686.rpm          | 196 kB   00:00     
(2/46): binutils-2.23.52.0.1-55.el7.x86_64.rpm             | 5.0 MB   00:01     
(3/46): cpp-4.8.5-4.el7.x86_64.rpm                         | 5.9 MB   00:01     
(4/46): gcc-c++-4.8.5-4.el7.x86_64.rpm                     | 7.2 MB   00:02     
(5/46): gcc-4.8.5-4.el7.x86_64.rpm                         |  16 MB   00:03     
(6/46): glibc-2.17-106.0.1.el7_2.6.i686.rpm                | 4.2 MB   00:01     
(7/46): gcc-gfortran-4.8.5-4.el7.x86_64.rpm                | 6.6 MB   00:02     
(8/46): glibc-2.17-106.0.1.el7_2.6.x86_64.rpm              | 3.6 MB   00:01     
(9/46): glibc-devel-2.17-106.0.1.el7_2.6.i686.rpm          | 1.0 MB   00:00     
(10/46): glibc-devel-2.17-106.0.1.el7_2.6.x86_64.rpm       | 1.0 MB   00:00     
(11/46): glibc-headers-2.17-106.0.1.el7_2.6.x86_64.rpm     | 662 kB   00:00     
(12/46): ksh-20120801-22.el7_1.3.x86_64.rpm                | 880 kB   00:00     
(13/46): libX11-1.6.3-2.el7.i686.rpm                       | 609 kB   00:00     
(14/46): libX11-1.6.3-2.el7.x86_64.rpm                     | 605 kB   00:00     
(15/46): libX11-common-1.6.3-2.el7.noarch.rpm              | 161 kB   00:00     
(16/46): libXau-1.0.8-2.1.el7.i686.rpm                     |  28 kB   00:00     
(17/46): libXext-1.3.3-3.el7.i686.rpm                      |  38 kB   00:00     
(18/46): libXext-1.3.3-3.el7.x86_64.rpm                    |  38 kB   00:00     
(19/46): libXi-1.7.4-2.el7.i686.rpm                        |  39 kB   00:00     
(20/46): libXi-1.7.4-2.el7.x86_64.rpm                      |  39 kB   00:00     
(21/46): libXtst-1.2.2-2.1.el7.i686.rpm                    |  19 kB   00:00     
(22/46): libaio-0.3.109-13.el7.i686.rpm                    |  24 kB   00:00     
(23/46): libaio-0.3.109-13.el7.x86_64.rpm                  |  24 kB   00:00     
(24/46): libaio-devel-0.3.109-13.el7.i686.rpm              |  12 kB   00:00     
(25/46): glibc-common-2.17-106.0.1.el7_2.6.x86_64.rpm      |  11 MB   00:04     
(26/46): libaio-devel-0.3.109-13.el7.x86_64.rpm            |  12 kB   00:00     
(27/46): libgcc-4.8.5-4.el7.i686.rpm                       | 102 kB   00:00     
(28/46): libgfortran-4.8.5-4.el7.x86_64.rpm                | 292 kB   00:00     
(29/46): libgomp-4.8.5-4.el7.x86_64.rpm                    | 130 kB   00:00     
(30/46): libgcc-4.8.5-4.el7.x86_64.rpm                     |  94 kB   00:00     
(31/46): libquadmath-4.8.5-4.el7.x86_64.rpm                | 182 kB   00:00     
(32/46): libquadmath-devel-4.8.5-4.el7.x86_64.rpm          |  45 kB   00:00     
(33/46): libstdc++-4.8.5-4.el7.i686.rpm                    | 310 kB   00:00     
(34/46): libstdc++-4.8.5-4.el7.x86_64.rpm                  | 297 kB   00:00     
(35/46): libstdc++-devel-4.8.5-4.el7.i686.rpm              | 1.5 MB   00:00     
(36/46): libstdc++-devel-4.8.5-4.el7.x86_64.rpm            | 1.5 MB   00:00     
(37/46): libxcb-1.11-4.el7.x86_64.rpm                      | 189 kB   00:00     
(38/46): libxcb-1.11-4.el7.i686.rpm                        | 201 kB   00:00     
(39/46): nss-softokn-freebl-3.16.2.3-14.2.el7_2.x86_64.rpm | 203 kB   00:00     
(40/46): nss-softokn-freebl-3.16.2.3-14.2.el7_2.i686.rpm   | 187 kB   00:00     
(41/46): unixODBC-devel-2.3.1-11.el7.x86_64.rpm            |  54 kB   00:00     
(42/46): unixODBC-2.3.1-11.el7.x86_64.rpm                  | 412 kB   00:00     
(43/46): zlib-1.2.7-15.el7.i686.rpm                        |  90 kB   00:00     
(44/46): zlib-1.2.7-15.el7.x86_64.rpm                      |  89 kB   00:00     
(45/46): zlib-devel-1.2.7-15.el7.x86_64.rpm                |  49 kB   00:00     
(46/46): zlib-devel-1.2.7-15.el7.i686.rpm                  |  49 kB   00:00     
--------------------------------------------------------------------------------
Total                                              5.2 MB/s |  71 MB  00:13     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Updating   : libgcc-4.8.5-4.el7.x86_64                                   1/70 
  Updating   : glibc-common-2.17-106.0.1.el7_2.6.x86_64                    2/70 
  Updating   : nss-softokn-freebl-3.16.2.3-14.2.el7_2.x86_64               3/70 
  Updating   : glibc-2.17-106.0.1.el7_2.6.x86_64                           4/70 
  Updating   : zlib-1.2.7-15.el7.x86_64                                    5/70 
  Updating   : libquadmath-4.8.5-4.el7.x86_64                              6/70 
  Updating   : libstdc++-4.8.5-4.el7.x86_64                                7/70 
  Updating   : glibc-headers-2.17-106.0.1.el7_2.6.x86_64                   8/70 
  Updating   : libX11-common-1.6.3-2.el7.noarch                            9/70 
  Installing : nss-softokn-freebl-3.16.2.3-14.2.el7_2.i686                10/70 
  Installing : glibc-2.17-106.0.1.el7_2.6.i686                            11/70 
  Installing : libgcc-4.8.5-4.el7.i686                                    12/70 
  Installing : glibc-devel-2.17-106.0.1.el7_2.6.i686                      13/70 
  Updating   : libgfortran-4.8.5-4.el7.x86_64                             14/70 
  Updating   : cpp-4.8.5-4.el7.x86_64                                     15/70 
  Updating   : binutils-2.23.52.0.1-55.el7.x86_64                         16/70 
  Updating   : libaio-0.3.109-13.el7.x86_64                               17/70 
  Installing : unixODBC-2.3.1-11.el7.x86_64                               18/70 
  Updating   : libgomp-4.8.5-4.el7.x86_64                                 19/70 
  Updating   : gcc-4.8.5-4.el7.x86_64                                     20/70 
  Updating   : libquadmath-devel-4.8.5-4.el7.x86_64                       21/70 
  Updating   : libxcb-1.11-4.el7.x86_64                                   22/70 
  Updating   : libX11-1.6.3-2.el7.x86_64                                  23/70 
  Updating   : libXext-1.3.3-3.el7.x86_64                                 24/70 
  Updating   : libXi-1.7.4-2.el7.x86_64                                   25/70 
  Updating   : gcc-gfortran-4.8.5-4.el7.x86_64                            26/70 
  Installing : unixODBC-devel-2.3.1-11.el7.x86_64                         27/70 
  Installing : libaio-devel-0.3.109-13.el7.x86_64                         28/70 
  Updating   : glibc-devel-2.17-106.0.1.el7_2.6.x86_64                    29/70 
  Updating   : libstdc++-devel-4.8.5-4.el7.x86_64                         30/70 
  Installing : zlib-devel-1.2.7-15.el7.x86_64                             31/70 
  Installing : ksh-20120801-22.el7_1.3.x86_64                             32/70 
  Installing : libstdc++-4.8.5-4.el7.i686                                 33/70 
  Installing : libstdc++-devel-4.8.5-4.el7.i686                           34/70 
  Installing : libXau-1.0.8-2.1.el7.i686                                  35/70 
  Installing : libxcb-1.11-4.el7.i686                                     36/70 
  Installing : libX11-1.6.3-2.el7.i686                                    37/70 
  Installing : libXext-1.3.3-3.el7.i686                                   38/70 
  Installing : libXi-1.7.4-2.el7.i686                                     39/70 
  Installing : libaio-0.3.109-13.el7.i686                                 40/70 
  Installing : zlib-1.2.7-15.el7.i686                                     41/70 
  Installing : zlib-devel-1.2.7-15.el7.i686                               42/70 
  Installing : libaio-devel-0.3.109-13.el7.i686                           43/70 
  Updating   : gcc-c++-4.8.5-4.el7.x86_64                                 44/70 
  Installing : libXtst-1.2.2-2.1.el7.i686                                 45/70 
  Installing : compat-libstdc++-33-3.2.3-72.el7.i686                      46/70 
  Cleanup    : gcc-gfortran-4.8.3-9.el7.x86_64                            47/70 
  Cleanup    : gcc-c++-4.8.3-9.el7.x86_64                                 48/70 
  Cleanup    : libgfortran-4.8.3-9.el7.x86_64                             49/70 
  Cleanup    : libXi-1.7.2-2.1.el7.x86_64                                 50/70 
  Cleanup    : libquadmath-devel-4.8.3-9.el7.x86_64                       51/70 
  Cleanup    : libstdc++-devel-4.8.3-9.el7.x86_64                         52/70 
  Cleanup    : gcc-4.8.3-9.el7.x86_64                                     53/70 
  Cleanup    : glibc-devel-2.17-78.0.1.el7.x86_64                         54/70 
  Cleanup    : binutils-2.23.52.0.1-30.el7_1.2.x86_64                     55/70 
  Cleanup    : cpp-4.8.3-9.el7.x86_64                                     56/70 
  Cleanup    : libstdc++-4.8.3-9.el7.x86_64                               57/70 
  Cleanup    : libXext-1.3.2-2.1.el7.x86_64                               58/70 
  Cleanup    : glibc-headers-2.17-78.0.1.el7.x86_64                       59/70 
  Cleanup    : libX11-1.6.0-2.1.el7.x86_64                                60/70 
  Cleanup    : libxcb-1.9-5.el7.x86_64                                    61/70 
  Cleanup    : zlib-1.2.7-13.el7.x86_64                                   62/70 
  Cleanup    : libgomp-4.8.3-9.el7.x86_64                                 63/70 
  Cleanup    : libquadmath-4.8.3-9.el7.x86_64                             64/70 
  Cleanup    : libaio-0.3.109-12.el7.x86_64                               65/70 
  Cleanup    : libX11-common-1.6.0-2.1.el7.noarch                         66/70 
  Cleanup    : glibc-common-2.17-78.0.1.el7.x86_64                        67/70 
  Cleanup    : nss-softokn-freebl-3.16.2.3-12.el7_1.x86_64                68/70 
  Cleanup    : glibc-2.17-78.0.1.el7.x86_64                               69/70 
  Cleanup    : libgcc-4.8.3-9.el7.x86_64                                  70/70 
  Verifying  : libXext-1.3.3-3.el7.x86_64                                  1/70 
  Verifying  : libgcc-4.8.5-4.el7.i686                                     2/70 
  Verifying  : gcc-4.8.5-4.el7.x86_64                                      3/70 
  Verifying  : glibc-devel-2.17-106.0.1.el7_2.6.i686                       4/70 
  Verifying  : libXext-1.3.3-3.el7.i686                                    5/70 
  Verifying  : libstdc++-4.8.5-4.el7.i686                                  6/70 
  Verifying  : glibc-2.17-106.0.1.el7_2.6.x86_64                           7/70 
  Verifying  : libxcb-1.11-4.el7.i686                                      8/70 
  Verifying  : gcc-c++-4.8.5-4.el7.x86_64                                  9/70 
  Verifying  : zlib-devel-1.2.7-15.el7.x86_64                             10/70 
  Verifying  : libaio-devel-0.3.109-13.el7.i686                           11/70 
  Verifying  : libX11-1.6.3-2.el7.x86_64                                  12/70 
  Verifying  : glibc-common-2.17-106.0.1.el7_2.6.x86_64                   13/70 
  Verifying  : unixODBC-devel-2.3.1-11.el7.x86_64                         14/70 
  Verifying  : libXau-1.0.8-2.1.el7.i686                                  15/70 
  Verifying  : libaio-0.3.109-13.el7.i686                                 16/70 
  Verifying  : zlib-1.2.7-15.el7.x86_64                                   17/70 
  Verifying  : ksh-20120801-22.el7_1.3.x86_64                             18/70 
  Verifying  : libaio-0.3.109-13.el7.x86_64                               19/70 
  Verifying  : libXtst-1.2.2-2.1.el7.i686                                 20/70 
  Verifying  : glibc-2.17-106.0.1.el7_2.6.i686                            21/70 
  Verifying  : libstdc++-4.8.5-4.el7.x86_64                               22/70 
  Verifying  : libX11-common-1.6.3-2.el7.noarch                           23/70 
  Verifying  : zlib-devel-1.2.7-15.el7.i686                               24/70 
  Verifying  : unixODBC-2.3.1-11.el7.x86_64                               25/70 
  Verifying  : libgfortran-4.8.5-4.el7.x86_64                             26/70 
  Verifying  : libstdc++-devel-4.8.5-4.el7.i686                           27/70 
  Verifying  : gcc-gfortran-4.8.5-4.el7.x86_64                            28/70 
  Verifying  : libaio-devel-0.3.109-13.el7.x86_64                         29/70 
  Verifying  : nss-softokn-freebl-3.16.2.3-14.2.el7_2.x86_64              30/70 
  Verifying  : glibc-headers-2.17-106.0.1.el7_2.6.x86_64                  31/70 
  Verifying  : zlib-1.2.7-15.el7.i686                                     32/70 
  Verifying  : libstdc++-devel-4.8.5-4.el7.x86_64                         33/70 
  Verifying  : libXi-1.7.4-2.el7.x86_64                                   34/70 
  Verifying  : cpp-4.8.5-4.el7.x86_64                                     35/70 
  Verifying  : compat-libstdc++-33-3.2.3-72.el7.i686                      36/70 
  Verifying  : libX11-1.6.3-2.el7.i686                                    37/70 
  Verifying  : libgomp-4.8.5-4.el7.x86_64                                 38/70 
  Verifying  : libgcc-4.8.5-4.el7.x86_64                                  39/70 
  Verifying  : binutils-2.23.52.0.1-55.el7.x86_64                         40/70 
  Verifying  : libquadmath-devel-4.8.5-4.el7.x86_64                       41/70 
  Verifying  : libXi-1.7.4-2.el7.i686                                     42/70 
  Verifying  : glibc-devel-2.17-106.0.1.el7_2.6.x86_64                    43/70 
  Verifying  : nss-softokn-freebl-3.16.2.3-14.2.el7_2.i686                44/70 
  Verifying  : libquadmath-4.8.5-4.el7.x86_64                             45/70 
  Verifying  : libxcb-1.11-4.el7.x86_64                                   46/70 
  Verifying  : glibc-common-2.17-78.0.1.el7.x86_64                        47/70 
  Verifying  : libX11-common-1.6.0-2.1.el7.noarch                         48/70 
  Verifying  : libxcb-1.9-5.el7.x86_64                                    49/70 
  Verifying  : libgfortran-4.8.3-9.el7.x86_64                             50/70 
  Verifying  : glibc-2.17-78.0.1.el7.x86_64                               51/70 
  Verifying  : libaio-0.3.109-12.el7.x86_64                               52/70 
  Verifying  : cpp-4.8.3-9.el7.x86_64                                     53/70 
  Verifying  : libstdc++-devel-4.8.3-9.el7.x86_64                         54/70 
  Verifying  : libX11-1.6.0-2.1.el7.x86_64                                55/70 
  Verifying  : gcc-gfortran-4.8.3-9.el7.x86_64                            56/70 
  Verifying  : libquadmath-devel-4.8.3-9.el7.x86_64                       57/70 
  Verifying  : libXi-1.7.2-2.1.el7.x86_64                                 58/70 
  Verifying  : glibc-devel-2.17-78.0.1.el7.x86_64                         59/70 
  Verifying  : gcc-c++-4.8.3-9.el7.x86_64                                 60/70 
  Verifying  : nss-softokn-freebl-3.16.2.3-12.el7_1.x86_64                61/70 
  Verifying  : libgcc-4.8.3-9.el7.x86_64                                  62/70 
  Verifying  : binutils-2.23.52.0.1-30.el7_1.2.x86_64                     63/70 
  Verifying  : glibc-headers-2.17-78.0.1.el7.x86_64                       64/70 
  Verifying  : gcc-4.8.3-9.el7.x86_64                                     65/70 
  Verifying  : zlib-1.2.7-13.el7.x86_64                                   66/70 
  Verifying  : libXext-1.3.2-2.1.el7.x86_64                               67/70 
  Verifying  : libstdc++-4.8.3-9.el7.x86_64                               68/70 
  Verifying  : libgomp-4.8.3-9.el7.x86_64                                 69/70 
  Verifying  : libquadmath-4.8.3-9.el7.x86_64                             70/70 
 
Installed:
  compat-libstdc++-33.i686 0:3.2.3-72.el7  glibc.i686 0:2.17-106.0.1.el7_2.6    
  glibc-devel.i686 0:2.17-106.0.1.el7_2.6  ksh.x86_64 0:20120801-22.el7_1.3     
  libX11.i686 0:1.6.3-2.el7                libXau.i686 0:1.0.8-2.1.el7          
  libXext.i686 0:1.3.3-3.el7               libXi.i686 0:1.7.4-2.el7             
  libXtst.i686 0:1.2.2-2.1.el7             libaio.i686 0:0.3.109-13.el7         
  libaio-devel.i686 0:0.3.109-13.el7       libaio-devel.x86_64 0:0.3.109-13.el7 
  libgcc.i686 0:4.8.5-4.el7                libstdc++.i686 0:4.8.5-4.el7         
  libstdc++-devel.i686 0:4.8.5-4.el7       libxcb.i686 0:1.11-4.el7             
  unixODBC.x86_64 0:2.3.1-11.el7           unixODBC-devel.x86_64 0:2.3.1-11.el7 
  zlib-devel.i686 0:1.2.7-15.el7           zlib-devel.x86_64 0:1.2.7-15.el7     
 
Dependency Installed:
  nss-softokn-freebl.i686 0:3.16.2.3-14.2.el7_2     zlib.i686 0:1.2.7-15.el7    
 
Updated:
  binutils.x86_64 0:2.23.52.0.1-55.el7                                          
  gcc.x86_64 0:4.8.5-4.el7                                                      
  gcc-c++.x86_64 0:4.8.5-4.el7                                                  
  glibc.x86_64 0:2.17-106.0.1.el7_2.6                                           
  glibc-devel.x86_64 0:2.17-106.0.1.el7_2.6                                     
  libX11.x86_64 0:1.6.3-2.el7                                                   
  libXext.x86_64 0:1.3.3-3.el7                                                  
  libXi.x86_64 0:1.7.4-2.el7                                                    
  libaio.x86_64 0:0.3.109-13.el7                                                
  libgcc.x86_64 0:4.8.5-4.el7                                                   
  libstdc++.x86_64 0:4.8.5-4.el7                                                
  libstdc++-devel.x86_64 0:4.8.5-4.el7                                          
  libxcb.x86_64 0:1.11-4.el7                                                    
 
Dependency Updated:
  cpp.x86_64 0:4.8.5-4.el7                                                      
  gcc-gfortran.x86_64 0:4.8.5-4.el7                                             
  glibc-common.x86_64 0:2.17-106.0.1.el7_2.6                                    
  glibc-headers.x86_64 0:2.17-106.0.1.el7_2.6                                   
  libX11-common.noarch 0:1.6.3-2.el7                                            
  libgfortran.x86_64 0:4.8.5-4.el7                                              
  libgomp.x86_64 0:4.8.5-4.el7                                                  
  libquadmath.x86_64 0:4.8.5-4.el7                                              
  libquadmath-devel.x86_64 0:4.8.5-4.el7                                        
  nss-softokn-freebl.x86_64 0:3.16.2.3-14.2.el7_2                               
  zlib.x86_64 0:1.2.7-15.el7                                                    
 
Complete!

After you have installed the prerequisites, you install the oracle-dbms-server-12cR1-preinstall library as the root user. You run the command as the root user like this:

yum install -y oracle-dbms-server-12cR1-preinstall

You should see the following when it’s successful:

Loaded plugins: langpacks
adobe-linux-x86_64                                       |  951 B     00:00     
ol7_UEKR3                                                | 1.2 kB     00:00     
ol7_latest                                               | 1.4 kB     00:00     
(1/2): ol7_latest/x86_64/updateinfo                      | 829 kB     00:00     
(2/2): ol7_latest/x86_64/primary                         |  16 MB     00:02     
ol7_latest                                                          14500/14500
Resolving Dependencies
--> Running transaction check
---> Package oracle-rdbms-server-12cR1-preinstall.x86_64 0:1.0-4.el7 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
================================================================================
 Package                                Arch     Version     Repository    Size
================================================================================
Installing:
 oracle-rdbms-server-12cR1-preinstall   x86_64   1.0-4.el7   ol7_latest    18 k
 
Transaction Summary
================================================================================
Install  1 Package
 
Total download size: 18 k
Installed size: 43 k
Downloading packages:
oracle-rdbms-server-12cR1-preinstall-1.0-4.el7.x86_64.rpm  |  18 kB   00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : oracle-rdbms-server-12cR1-preinstall-1.0-4.el7.x86_64        1/1 
  Verifying  : oracle-rdbms-server-12cR1-preinstall-1.0-4.el7.x86_64        1/1 
 
Installed:
  oracle-rdbms-server-12cR1-preinstall.x86_64 0:1.0-4.el7                       
 
Complete!

After running the oracle-dbms-server-12cR1-preinstall library, you can navigate through the Applications, Sundry, and Users and Groups to see the following dialog:

OracleUserCreated

It’s hard to tell from the GUI the oracle user’s group. You can find oracle primary user’s group by checking the /etc/passwd file. You will find that oinstall is the primary user’s group.

As always, I hope this helps those trying to install an Oracle Database 12c instance. Please post a comment if you have a better way to load the pre-requisite packages.

Written by maclochlainn

May 31st, 2016 at 2:44 am

Linux User-Group Console

without comments

This post shows you how to add the menu option and GUI to set users and groups. It’s quite a bit easier than mastering all the command-line syntax. It makes setting up the required user and group accounts for an Oracle Enterprise or MySQL database solution much easier.

You add the utility by calling the yum (Yellowdog Updater, Modified) utility like this:

yum installed -y system-config_users

You should see the following:

Loaded plugins: langpacks
adobe-linux-x86_64                                       |  951 B     00:00     
ol7_UEKR3                                                | 1.2 kB     00:00     
ol7_latest                                               | 1.4 kB     00:00     
Resolving Dependencies
--> Running transaction check
---> Package system-config-users.noarch 0:1.3.5-2.el7 will be installed
--> Processing Dependency: system-config-users-docs for package: system-config-users-1.3.5-2.el7.noarch
--> Running transaction check
---> Package system-config-users-docs.noarch 0:1.0.9-6.el7 will be installed
--> Processing Dependency: rarian-compat for package: system-config-users-docs-1.0.9-6.el7.noarch
--> Running transaction check
---> Package rarian-compat.x86_64 0:0.8.1-11.el7 will be installed
--> Processing Dependency: rarian = 0.8.1-11.el7 for package: rarian-compat-0.8.1-11.el7.x86_64
--> Processing Dependency: rarian for package: rarian-compat-0.8.1-11.el7.x86_64
--> Processing Dependency: librarian.so.0()(64bit) for package: rarian-compat-0.8.1-11.el7.x86_64
--> Running transaction check
---> Package rarian.x86_64 0:0.8.1-11.el7 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
================================================================================
 Package                      Arch       Version           Repository      Size
================================================================================
Installing:
 system-config-users          noarch     1.3.5-2.el7       ol7_latest     337 k
Installing for dependencies:
 rarian                       x86_64     0.8.1-11.el7      ol7_latest      97 k
 rarian-compat                x86_64     0.8.1-11.el7      ol7_latest      65 k
 system-config-users-docs     noarch     1.0.9-6.el7       ol7_latest     307 k
 
Transaction Summary
================================================================================
Install  1 Package (+3 Dependent packages)
 
Total download size: 805 k
Installed size: 3.9 M
Downloading packages:
(1/4): rarian-0.8.1-11.el7.x86_64.rpm                      |  97 kB   00:00     
(2/4): rarian-compat-0.8.1-11.el7.x86_64.rpm               |  65 kB   00:00     
(3/4): system-config-users-1.3.5-2.el7.noarch.rpm          | 337 kB   00:00     
(4/4): system-config-users-docs-1.0.9-6.el7.noarch.rpm     | 307 kB   00:00     
--------------------------------------------------------------------------------
Total                                              830 kB/s | 805 kB  00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : rarian-0.8.1-11.el7.x86_64                                   1/4 
  Installing : rarian-compat-0.8.1-11.el7.x86_64                            2/4 
  Installing : system-config-users-1.3.5-2.el7.noarch                       3/4 
  Installing : system-config-users-docs-1.0.9-6.el7.noarch                  4/4 
  Verifying  : rarian-compat-0.8.1-11.el7.x86_64                            1/4 
  Verifying  : system-config-users-1.3.5-2.el7.noarch                       2/4 
  Verifying  : rarian-0.8.1-11.el7.x86_64                                   3/4 
  Verifying  : system-config-users-docs-1.0.9-6.el7.noarch                  4/4 
 
Installed:
  system-config-users.noarch 0:1.3.5-2.el7                                      
 
Dependency Installed:
  rarian.x86_64 0:0.8.1-11.el7                                                  
  rarian-compat.x86_64 0:0.8.1-11.el7                                           
  system-config-users-docs.noarch 0:1.0.9-6.el7                                 
 
Complete!

After successfully installing the radian, rarian-compat, system-config-users, and system-config-users-docs packages, you will find that there’s now a Users and Groups option when you navigate by clicking on Applications and then clicking on Sundry from the menu.

Menu Instructions

SQLDeveloper1

  1. You navigate to the Applications menu, and choose Sundry from the menu list and Users and Groups from the menu item to continue.

SQLDeveloper1

  1. You will be prompted for the sudoer’s password in this dialog.

SQLDeveloper1

  1. At this point, you can use the GUI interface to set users and groups.

As always, I hope this helps those trying to set users and passwords without mastering the command-line syntax.

Written by maclochlainn

May 29th, 2016 at 4:32 pm

Fedora LAMP Steps

without comments

I posted earlier in the year how to configure a Fedora instance to test PHP code on a local VM. However, I’ve got a few questions on how to find those posts. Here’s a consolidation with links on those steps:

  1. Go to this blog post and install the httpd and php libraries with the yum installer.
  2. In the same blog post as step 1 (you can put the sample PHP code into the /var/www/html directory for testing), connect to the yum shell and remove the php-mysql library and then install the mysqlnd library.
  3. Go to this blog post and install the php-gd libraries, which enable you to render PNG images stored as binary streams in MySQL.

As always, I hope that helps.

Written by maclochlainn

December 9th, 2015 at 9:44 am

MySQL OCP Exams

with 6 comments

Planning out my year, I decided to take the Oracle OCP and MySQL OCP exams. I checked for review books and was pleasantly surprised to find the soon to be released OCP MySQL Database Administrator Exam Guide (Exam 1Z0-883). However, I noticed that the book was actually prepared for the obsolete and discountinued Exams 1Z0-870, 1Z0-873, and 1Z0-874. As it turns out, Steve O’Hearn has informed me that there isn’t a book and that the posting in Amazon.com is in error.

There isn’t an alternative review book for the OCP MySQL 5.6 Developer or Database Administrator Exams. The question that I have is simple: “How relevant is this book because it was prepared for the older exams?” There isn’t a table of content published on the Amazon.com site. If there was a table of contents it could help me determine how close the book’s content is to the new exam.

As a preparation to figure out the value of the book as a study guide, I’ve reviewed the current Oracle MySQL Training Objectives (listed below). The new MySQL OCP Developer and Administrator exams have the following descriptions and objectives:

  • MySQL 5.6 Developer 1Z0-882. Oracle provides the following outline for their MySQL for Developer (Ed 3) training course:

    Course Objectives

    • Describe the MySQL client/server architecture
    • Use MySQL client programs and common options
    • Program MySQL applications with Java and PHP connectors
    • Use a “NoSQL” approach to store and retrieve data
    • Design efficient tables
    • Create and delete database objects
    • Use expressions in SQL statements
    • Examine database metadata
    • Use SQL statements to modify table data
    • Maintain database integrity with transactions
    • Write multiple table queries
    • Create “virtual tables” containing specific data
    • Create user-defined variables, prepared statements, and stored routines
    • Create and manage triggers
    • Identify and deal with errors and exceptions in client programs
    • Write queries that are fast and effective, even under heavy loads
  • MySQL 5.6 Database Administrator 1Z0-883. Oracle provides the following outline for their MySQL for Database Administrators (Ed 3.1) training course:

    Course Objectives

    • Describe the MySQL Architecture
    • Install and Upgrade MySQL
    • Use the INFORMATION_SCHEMA database to access metadata
    • Perform the MySQL start and shutdown operations
    • Configure MySQL server options at runtime
    • Use available tools including MySQL Workbench
    • Evaluate data types and character sets for performance issues
    • Understand data locking in MySQL
    • Understand the use of the InnoDB storage engine with MySQL
    • Maintain integrity of a MySQL installation
    • Use triggers for administration tasks
    • Use Enterprise Audit and Pluggable Authentication
    • Configure advanced replication topologies for high availability
    • Describe introductory performance tuning techniques
    • Perform backup and restore operations
    • Automate administrative tasks with scheduled events

    As always, I hope this helps those who read it; and, in this case I hope it helps you make an effective decision on preparation resources for the MySQL 5.6 OCP exams.

Written by maclochlainn

April 24th, 2015 at 12:39 am

Add zsh to Fedora

with one comment

One of my students requested an option to the bash shell. It was interesting to hear that he wanted me to instal the zsh in my Fedora image. There’s only one book that I’m aware of that’s been published on the Z Shell, and it is From Bash to Z Shell.

This post shows how to add the zsh to my Fedora image because I already release a new one for the term without the zsh shell. You use the yum utility as the root user to install the zsh library:

yum install -y zsh

It should produce an output stream like the following, which required accessing the alternate mirror site:

Loaded plugins: langpacks, refresh-packagekit
mysql-connectors-community                                  | 2.5 kB  00:00     
mysql-tools-community                                       | 2.5 kB  00:00     
mysql56-community                                           | 2.5 kB  00:00     
pgdg93                                                      | 3.6 kB  00:00     
updates/20/x86_64/metalink                                  |  14 kB  00:00     
updates                                                     | 4.9 kB  00:00     
(1/3): mysql-connectors-community/20/x86_64/primary_db      | 8.8 kB  00:00     
(2/3): pgdg93/20/x86_64/primary_db                          |  83 kB  00:01     
(3/3): updates/20/x86_64/primary_db                         |  13 MB  00:13     
updates/20/x86_64/pkgtags      FAILED                                           
http://mirror.utexas.edu/fedora/linux/updates/20/x86_64/repodata/1ea83dc402a2bcba53f9b0011ecfa0d579b5a316e4c7f01ec5f1166dcdca138f-pkgtags.sqlite.gz: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
(1/2): updates/20/x86_64/updateinfo                         | 1.9 MB  00:07     
(2/2): updates/20/x86_64/pkgtags                            | 1.4 MB  00:01     
Resolving Dependencies
--> Running transaction check
---> Package zsh.x86_64 0:5.0.7-6.fc20 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
================================================================================
 Package       Arch             Version                 Repository         Size
================================================================================
Installing:
 zsh           x86_64           5.0.7-6.fc20            updates           2.5 M
 
Transaction Summary
================================================================================
Install  1 Package
 
Total download size: 2.5 M
Installed size: 5.9 M
Downloading packages:
zsh-5.0.7-6.fc20.x86_64.rpm                                 | 2.5 MB  00:03     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction (shutdown inhibited)
  Installing : zsh-5.0.7-6.fc20.x86_64                                      1/1 
  Verifying  : zsh-5.0.7-6.fc20.x86_64                                      1/1 
 
Installed:
  zsh.x86_64 0:5.0.7-6.fc20                                                     
 
Complete!

Once you’ve installed the zsh, you can configure like you would the bash shell. You make edits to individual .zshrc files and generic changes to the /etc/zshrc file. You can find the documentation to edit the zsh in the User’s Guide to the Z-Shell.

The following is a modified .zshrc file. The changes enable the up-arrow in Oracle’s sqlplus and provides you with a color prompt, like this:

# Source global definitions
if [ -f /etc/zshrc ]; then
  . /etc/zshrc
fi
 
# Uncomment the following line if you don't like systemctl's auto-paging feature:
# export SYSTEMD_PAGER=
 
# Set the JAVA_HOME path.
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75-2.5.4.2.fc20.x86_64
 
# Set the CLASSPATH path.
export CLASSPATH=/usr/share/java/mysql-connector-java.jar:.
 
# User specific aliases and functions
. /u01/app/oracle/product/11.2.0/xe/bin/oracle_env.sh
 
# Wrap sqlplus with rlwrap to edit prior lines with the
# up, down, left and right keys.
sqlplus()
{
  if [ "$RLWRAP" = "0" ]; then
    sqlplus "$@"
  else
    rlwrap sqlplus "$@"
  fi
}
 
# Set the bindkey.
bindkey -v
bindkey "^R" history-incremental-search-backward
export EDITOR="vim"
 
# history stuff
HISTFILE=~/.zsh-histfile
HISTSIZE=2000
 
# Set vi as a command line editor.
set -o vi
 
autoload -U colors && colors
PS1="[%{$fg[red]%}%n%{$reset_color%}@%{$fg[blue]%}%m %{$fg[yellow]%}%~%{$reset_color%}% ]$ "

The zsh prompt looks like the following:

[student@localhost ~]$

If you’re configured with a bash shell, you can change your shell to a zsh with the following command:

chsh -s /bin/zsh

As always, I hope this helps those looking for this type of information.

Written by maclochlainn

April 22nd, 2015 at 11:09 pm

Find a string in files

with 2 comments

From time to time, folks ask questions about how to solve common problems in Linux or Unix. Today, the question is: “How do I find a list of files that contain a specific string?” There are two alternatives with the find command, and the following sample searches look for files that contain a sqlite3 string literal.

  • Search for only the file names:
find . -type f | xargs grep -li sqlite3

Or, the more verbose:

find . -type f -exec grep -li sqlite3 /dev/null {} +
  • Search for the file names and text line:
find . -type f | xargs grep -i sqlite3

Or, the more verbose:

find . -type f -exec grep -i sqlite3 /dev/null {} +

Don’t exclude the /dev/null from the verbose syntax or you’ll get the things you lack permissions to inspect or that raise other errors. I don’t post a lot of Linux or Unix tips and techniques, and you may find this site more useful to answer these types of questions:

Unix & Linux Stack Exchange web site

As always, I hope this helps those you land on the blog page.

Written by maclochlainn

April 18th, 2015 at 2:39 pm

Ruby-MySQL Columns

with one comment

Last week I posted how to configure and test Ruby and MySQL. Somebody asked me how to handle a dynamic list of columns. So, here’s a quick little program to show you how to read the dynamic list of column:

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require 'rubygems'
require 'mysql'
 
# Begin block.
begin
  # Create a new connection resource.
  db = Mysql.new('localhost','student','student','studentdb')
 
  # Create a result set.
  rs = db.query('SELECT item_title, item_rating FROM item')
  # Read through the result set hash.
  rs.each do | row |
    out = ""
    i = 0
    while i < db.field_count
      # Check if not last column.
      if i < db.field_count - 1
        out += "#{row[i]}, "
      else
        out += "#{row[i]}"
      end
      i += 1
    end
    puts "#{out}"
  end
  # Release the result set resources.
  rs.free
rescue Mysql::Error => e
  # Print the error.
  puts "ERROR #{e.errno} (#{e.sqlstate}): #{e.error}"
  puts "Can't connect to MySQL database specified."
  # Signal an error.
  exit 1
ensure
  # Close the connection when it is open.
  db.close if db
end

The new logic on lines 13 through 22 reads the list of columns into a comma delimited list of values. The if-block checks to make sure it doesn’t append a comma to the last column in the list. It prints output like:

The Hunt for Red October, PG
Star Wars I, PG
Star Wars II, PG
Star Wars II, PG
Star Wars III, PG13
The Chronicles of Narnia, PG
RoboCop, Mature
Pirates of the Caribbean, Teen
The Chronicles of Narnia, Everyone
MarioKart, Everyone
Splinter Cell, Teen
Need for Speed, Everyone
The DaVinci Code, Teen
Cars, Everyone
Beau Geste, PG
I Remember Mama, NR
Tora! Tora! Tora!, G
A Man for All Seasons, G
Hook, PG
Around the World in 80 Days, G
Harry Potter and the Sorcerer's Stone, PG
Camelot, G

As always, I hope this helps those looking for a solution.

Written by maclochlainn

April 18th, 2015 at 2:25 am

Java-MySQL Program

with one comment

It turns out that configuring Perl wasn’t the last step for my student instance. It appears that I neglected to configure my student instance to support Java connectivity to MySQL. This post reviews the configuration of Java to run programs against MySQL. It also covers the new syntax on how you register a DriverManager, and avoid Java compilation errors with the older syntax.

In prior posts, I’ve shown how to use Perl , PHP, Python, and Ruby languages to query a MySQL database on Linux.

You need to install the Open JDK libraries with the yum utility command:

yum install -y java-1.7.0-openjdk*

It should generate the following log output:

Loaded plugins: langpacks, refresh-packagekit
Package 1:java-1.7.0-openjdk-1.7.0.75-2.5.4.2.fc20.x86_64 already installed and latest version
Package 1:java-1.7.0-openjdk-headless-1.7.0.75-2.5.4.2.fc20.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package java-1.7.0-openjdk-accessibility.x86_64 1:1.7.0.75-2.5.4.2.fc20 will be installed
--> Processing Dependency: java-atk-wrapper for package: 1:java-1.7.0-openjdk-accessibility-1.7.0.75-2.5.4.2.fc20.x86_64
---> Package java-1.7.0-openjdk-demo.x86_64 1:1.7.0.75-2.5.4.2.fc20 will be installed
---> Package java-1.7.0-openjdk-devel.x86_64 1:1.7.0.75-2.5.4.2.fc20 will be installed
---> Package java-1.7.0-openjdk-javadoc.noarch 1:1.7.0.75-2.5.4.2.fc20 will be installed
---> Package java-1.7.0-openjdk-src.x86_64 1:1.7.0.75-2.5.4.2.fc20 will be installed
--> Running transaction check
---> Package java-atk-wrapper.x86_64 0:0.30.4-4.fc20 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
================================================================================
 Package                          Arch   Version                  Repository
                                                                           Size
================================================================================
Installing:
 java-1.7.0-openjdk-accessibility x86_64 1:1.7.0.75-2.5.4.2.fc20  updates  32 k
 java-1.7.0-openjdk-demo          x86_64 1:1.7.0.75-2.5.4.2.fc20  updates 1.9 M
 java-1.7.0-openjdk-devel         x86_64 1:1.7.0.75-2.5.4.2.fc20  updates 9.2 M
 java-1.7.0-openjdk-javadoc       noarch 1:1.7.0.75-2.5.4.2.fc20  updates  14 M
 java-1.7.0-openjdk-src           x86_64 1:1.7.0.75-2.5.4.2.fc20  updates  39 M
Installing for dependencies:
 java-atk-wrapper                 x86_64 0.30.4-4.fc20            fedora   71 k
 
Transaction Summary
================================================================================
Install  12 Packages (+1 Dependent package)
 
Total download size: 163 M
Installed size: 765 M
Downloading packages:
(1/6): java-1.7.0-openjdk-accessibility-1.7.0.75-2.5.4.2.f |  32 kB  00:00     
(2/6): java-1.7.0-openjdk-demo-1.7.0.75-2.5.4.2.fc20.x86_6 | 1.9 MB  00:02     
(3/6): java-1.7.0-openjdk-devel-1.7.0.75-2.5.4.2.fc20.x86_ | 9.2 MB  00:05     
(4/6): java-1.7.0-openjdk-javadoc-1.7.0.75-2.5.4.2.fc20.no |  14 MB  00:04     
(5/6): java-atk-wrapper-0.30.4-4.fc20.x86_64.rpm           |  71 kB  00:00     
(6/6): java-1.7.0-openjdk-src-1.7.0.75-2.5.4.2.fc20.x86_6  |  39 MB  00:23     
--------------------------------------------------------------------------------
Total                                             4.5 MB/s | 163 MB  00:36     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction (shutdown inhibited)
  Installing : java-atk-wrapper-0.30.4-4.fc20.x86_64                       3/13 
  Installing : 1:java-1.7.0-openjdk-accessibility-1.7.0.75-2.5.4.2.fc20    4/13 
  Installing : 1:java-1.7.0-openjdk-devel-1.7.0.75-2.5.4.2.fc20.x86_64     9/13 
  Installing : 1:java-1.7.0-openjdk-src-1.7.0.75-2.5.4.2.fc20.x86_64      10/13 
  Installing : 1:java-1.7.0-openjdk-javadoc-1.7.0.75-2.5.4.2.fc20.noarc   12/13 
  Installing : 1:java-1.7.0-openjdk-demo-1.7.0.75-2.5.4.2.fc20.x86_64     13/13 
  Verifying  : 1:java-1.7.0-openjdk-demo-1.7.0.75-2.5.4.2.fc20.x86_64      2/13 
  Verifying  : 1:java-1.7.0-openjdk-javadoc-1.7.0.75-2.5.4.2.fc20.noarc    3/13 
  Verifying  : java-atk-wrapper-0.30.4-4.fc20.x86_64                       5/13 
  Verifying  : 1:java-1.7.0-openjdk-accessibility-1.7.0.75-2.5.4.2.fc20    6/13 
  Verifying  : 1:java-1.7.0-openjdk-devel-1.7.0.75-2.5.4.2.fc20.x86_64     8/13 
  Verifying  : 1:java-1.7.0-openjdk-src-1.7.0.75-2.5.4.2.fc20.x86_64      12/13 
 
Installed:
  java-1.7.0-openjdk-accessibility.x86_64 1:1.7.0.75-2.5.4.2.fc20               
  java-1.7.0-openjdk-demo.x86_64 1:1.7.0.75-2.5.4.2.fc20                        
  java-1.7.0-openjdk-devel.x86_64 1:1.7.0.75-2.5.4.2.fc20                       
  java-1.7.0-openjdk-javadoc.noarch 1:1.7.0.75-2.5.4.2.fc20                     
  java-1.7.0-openjdk-src.x86_64 1:1.7.0.75-2.5.4.2.fc20                         
 
Dependency Installed:
  java-atk-wrapper.x86_64 0:0.30.4-4.fc20                                       
 
Complete!

You can find the Java compiler’s version with the following command:

javac -version

It should show you the following Java version:

javac 1.7.0_75

Next, you need to install the mysql-connector-java library with yum like this:

yum install -y mysql-connector-java

It should generate the following installation output:

Loaded plugins: langpacks, refresh-packagekit
mysql-connectors-community                                  | 2.5 kB  00:00     
mysql-tools-community                                       | 2.5 kB  00:00     
mysql56-community                                           | 2.5 kB  00:00     
pgdg93                                                      | 3.6 kB  00:00     
updates/20/x86_64/metalink                                  |  15 kB  00:00     
Resolving Dependencies
--> Running transaction check
---> Package mysql-connector-java.noarch 1:5.1.28-1.fc20 will be installed
--> Processing Dependency: jta >= 1.0 for package: 1:mysql-connector-java-5.1.28-1.fc20.noarch
--> Processing Dependency: slf4j for package: 1:mysql-connector-java-5.1.28-1.fc20.noarch
--> Running transaction check
---> Package geronimo-jta.noarch 0:1.1.1-15.fc20 will be installed
---> Package slf4j.noarch 0:1.7.5-3.fc20 will be installed
--> Processing Dependency: mvn(log4j:log4j) for package: slf4j-1.7.5-3.fc20.noarch
--> Processing Dependency: mvn(javassist:javassist) for package: slf4j-1.7.5-3.fc20.noarch
--> Processing Dependency: mvn(commons-logging:commons-logging) for package: slf4j-1.7.5-3.fc20.noarch
--> Processing Dependency: mvn(commons-lang:commons-lang) for package: slf4j-1.7.5-3.fc20.noarch
--> Processing Dependency: mvn(ch.qos.cal10n:cal10n-api) for package: slf4j-1.7.5-3.fc20.noarch
--> Running transaction check
---> Package apache-commons-lang.noarch 0:2.6-13.fc20 will be installed
---> Package apache-commons-logging.noarch 0:1.1.3-8.fc20 will be installed
--> Processing Dependency: mvn(logkit:logkit) for package: apache-commons-logging-1.1.3-8.fc20.noarch
--> Processing Dependency: mvn(avalon-framework:avalon-framework-api) for package: apache-commons-logging-1.1.3-8.fc20.noarch
---> Package cal10n.noarch 0:0.7.7-3.fc20 will be installed
---> Package javassist.noarch 0:3.16.1-6.fc20 will be installed
---> Package log4j.noarch 0:1.2.17-14.fc20 will be installed
--> Processing Dependency: mvn(org.apache.geronimo.specs:geronimo-jms_1.1_spec) for package: log4j-1.2.17-14.fc20.noarch
--> Processing Dependency: mvn(javax.mail:mail) for package: log4j-1.2.17-14.fc20.noarch
--> Running transaction check
---> Package avalon-framework.noarch 0:4.3-9.fc20 will be installed
--> Processing Dependency: xalan-j2 for package: avalon-framework-4.3-9.fc20.noarch
---> Package avalon-logkit.noarch 0:2.1-13.fc20 will be installed
--> Processing Dependency: tomcat-servlet-3.0-api for package: avalon-logkit-2.1-13.fc20.noarch
---> Package geronimo-jms.noarch 0:1.1.1-17.fc20 will be installed
---> Package javamail.noarch 0:1.5.0-6.fc20 will be installed
--> Running transaction check
---> Package tomcat-servlet-3.0-api.noarch 0:7.0.52-2.fc20 will be installed
---> Package xalan-j2.noarch 0:2.7.1-22.fc20 will be installed
--> Processing Dependency: xerces-j2 for package: xalan-j2-2.7.1-22.fc20.noarch
--> Processing Dependency: osgi(org.apache.xerces) for package: xalan-j2-2.7.1-22.fc20.noarch
--> Running transaction check
---> Package xerces-j2.noarch 0:2.11.0-17.fc20 will be installed
--> Processing Dependency: xml-commons-resolver >= 1.2 for package: xerces-j2-2.11.0-17.fc20.noarch
--> Processing Dependency: xml-commons-apis >= 1.4.01 for package: xerces-j2-2.11.0-17.fc20.noarch
--> Processing Dependency: osgi(org.apache.xml.resolver) for package: xerces-j2-2.11.0-17.fc20.noarch
--> Processing Dependency: osgi(javax.xml) for package: xerces-j2-2.11.0-17.fc20.noarch
--> Running transaction check
---> Package xml-commons-apis.noarch 0:1.4.01-14.fc20 will be installed
---> Package xml-commons-resolver.noarch 0:1.2-14.fc20 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
================================================================================
 Package                    Arch       Version                Repository   Size
================================================================================
Installing:
 mysql-connector-java       noarch     1:5.1.28-1.fc20        updates     1.3 M
Installing for dependencies:
 apache-commons-lang        noarch     2.6-13.fc20            fedora      281 k
 apache-commons-logging     noarch     1.1.3-8.fc20           updates      78 k
 avalon-framework           noarch     4.3-9.fc20             fedora       87 k
 avalon-logkit              noarch     2.1-13.fc20            fedora       87 k
 cal10n                     noarch     0.7.7-3.fc20           fedora       37 k
 geronimo-jms               noarch     1.1.1-17.fc20          fedora       32 k
 geronimo-jta               noarch     1.1.1-15.fc20          fedora       21 k
 javamail                   noarch     1.5.0-6.fc20           fedora      606 k
 javassist                  noarch     3.16.1-6.fc20          fedora      626 k
 log4j                      noarch     1.2.17-14.fc20         fedora      449 k
 slf4j                      noarch     1.7.5-3.fc20           fedora      173 k
 tomcat-servlet-3.0-api     noarch     7.0.52-2.fc20          updates     207 k
 xalan-j2                   noarch     2.7.1-22.fc20          updates     1.9 M
 xerces-j2                  noarch     2.11.0-17.fc20         updates     1.1 M
 xml-commons-apis           noarch     1.4.01-14.fc20         fedora      227 k
 xml-commons-resolver       noarch     1.2-14.fc20            fedora      108 k
 
Transaction Summary
================================================================================
Install  1 Package (+16 Dependent packages)
 
Total download size: 7.3 M
Installed size: 10 M
Downloading packages:
(1/17): apache-commons-logging-1.1.3-8.fc20.noarch.rpm      |  78 kB  00:00     
(2/17): apache-commons-lang-2.6-13.fc20.noarch.rpm          | 281 kB  00:00     
(3/17): avalon-framework-4.3-9.fc20.noarch.rpm              |  87 kB  00:00     
(4/17): avalon-logkit-2.1-13.fc20.noarch.rpm                |  87 kB  00:00     
(5/17): cal10n-0.7.7-3.fc20.noarch.rpm                      |  37 kB  00:00     
(6/17): geronimo-jms-1.1.1-17.fc20.noarch.rpm               |  32 kB  00:00     
(7/17): geronimo-jta-1.1.1-15.fc20.noarch.rpm               |  21 kB  00:00     
(8/17): javamail-1.5.0-6.fc20.noarch.rpm                    | 606 kB  00:00     
(9/17): javassist-3.16.1-6.fc20.noarch.rpm                  | 626 kB  00:00     
(10/17): log4j-1.2.17-14.fc20.noarch.rpm                    | 449 kB  00:00     
(11/17): slf4j-1.7.5-3.fc20.noarch.rpm                      | 173 kB  00:00     
(12/17): mysql-connector-java-5.1.28-1.fc20.noarch.rpm      | 1.3 MB  00:01     
(13/17): tomcat-servlet-3.0-api-7.0.52-2.fc20.noarch.rpm    | 207 kB  00:00     
(14/17): xalan-j2-2.7.1-22.fc20.noarch.rpm                  | 1.9 MB  00:00     
(15/17): xerces-j2-2.11.0-17.fc20.noarch.rpm                | 1.1 MB  00:00     
(16/17): xml-commons-apis-1.4.01-14.fc20.noarch.rpm         | 227 kB  00:00     
(17/17): xml-commons-resolver-1.2-14.fc20.noarch.rpm        | 108 kB  00:00     
--------------------------------------------------------------------------------
Total                                              1.3 MB/s | 7.3 MB  00:05     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction (shutdown inhibited)
  Installing : xml-commons-apis-1.4.01-14.fc20.noarch                      1/17 
  Installing : geronimo-jms-1.1.1-17.fc20.noarch                           2/17 
  Installing : xml-commons-resolver-1.2-14.fc20.noarch                     3/17 
  Installing : xerces-j2-2.11.0-17.fc20.noarch                             4/17 
  Installing : xalan-j2-2.7.1-22.fc20.noarch                               5/17 
  Installing : javamail-1.5.0-6.fc20.noarch                                6/17 
  Installing : log4j-1.2.17-14.fc20.noarch                                 7/17 
  Installing : tomcat-servlet-3.0-api-7.0.52-2.fc20.noarch                 8/17 
  Installing : avalon-framework-4.3-9.fc20.noarch                          9/17 
  Installing : avalon-logkit-2.1-13.fc20.noarch                           10/17 
  Installing : apache-commons-logging-1.1.3-8.fc20.noarch                 11/17 
  Installing : javassist-3.16.1-6.fc20.noarch                             12/17 
  Installing : cal10n-0.7.7-3.fc20.noarch                                 13/17 
  Installing : apache-commons-lang-2.6-13.fc20.noarch                     14/17 
  Installing : slf4j-1.7.5-3.fc20.noarch                                  15/17 
  Installing : geronimo-jta-1.1.1-15.fc20.noarch                          16/17 
  Installing : 1:mysql-connector-java-5.1.28-1.fc20.noarch                17/17 
  Verifying  : geronimo-jta-1.1.1-15.fc20.noarch                           1/17 
  Verifying  : geronimo-jms-1.1.1-17.fc20.noarch                           2/17 
  Verifying  : xalan-j2-2.7.1-22.fc20.noarch                               3/17 
  Verifying  : apache-commons-lang-2.6-13.fc20.noarch                      4/17 
  Verifying  : slf4j-1.7.5-3.fc20.noarch                                   5/17 
  Verifying  : log4j-1.2.17-14.fc20.noarch                                 6/17 
  Verifying  : avalon-framework-4.3-9.fc20.noarch                          7/17 
  Verifying  : xerces-j2-2.11.0-17.fc20.noarch                             8/17 
  Verifying  : cal10n-0.7.7-3.fc20.noarch                                  9/17 
  Verifying  : avalon-logkit-2.1-13.fc20.noarch                           10/17 
  Verifying  : 1:mysql-connector-java-5.1.28-1.fc20.noarch                11/17 
  Verifying  : xml-commons-resolver-1.2-14.fc20.noarch                    12/17 
  Verifying  : xml-commons-apis-1.4.01-14.fc20.noarch                     13/17 
  Verifying  : javassist-3.16.1-6.fc20.noarch                             14/17 
  Verifying  : tomcat-servlet-3.0-api-7.0.52-2.fc20.noarch                15/17 
  Verifying  : javamail-1.5.0-6.fc20.noarch                               16/17 
  Verifying  : apache-commons-logging-1.1.3-8.fc20.noarch                 17/17 
 
Installed:
  mysql-connector-java.noarch 1:5.1.28-1.fc20                                   
 
Dependency Installed:
  apache-commons-lang.noarch 0:2.6-13.fc20                                      
  apache-commons-logging.noarch 0:1.1.3-8.fc20                                  
  avalon-framework.noarch 0:4.3-9.fc20                                          
  avalon-logkit.noarch 0:2.1-13.fc20                                            
  cal10n.noarch 0:0.7.7-3.fc20                                                  
  geronimo-jms.noarch 0:1.1.1-17.fc20                                           
  geronimo-jta.noarch 0:1.1.1-15.fc20                                           
  javamail.noarch 0:1.5.0-6.fc20                                                
  javassist.noarch 0:3.16.1-6.fc20                                              
  log4j.noarch 0:1.2.17-14.fc20                                                 
  slf4j.noarch 0:1.7.5-3.fc20                                                   
  tomcat-servlet-3.0-api.noarch 0:7.0.52-2.fc20                                 
  xalan-j2.noarch 0:2.7.1-22.fc20                                               
  xerces-j2.noarch 0:2.11.0-17.fc20                                             
  xml-commons-apis.noarch 0:1.4.01-14.fc20                                      
  xml-commons-resolver.noarch 0:1.2-14.fc20                                     
 
Complete!

I must write too much Java code for the Windows platform because I didn’t notice the change in how the DriverManager should be instantiated. Initially, I wrote the program using the following declaration for the DriverManager class:

30
      DriverManager.registerDriver(new com.mysql.jdbc.Driver());

While it worked on Windows, the same syntax in the MySQL.java program raised two errors on the Linux server. One for the declaration of the com.mysql.jdbc.Driver class and another trying to declare an instance of Driver class.

These are the two errors:

MySQL.java:5: error: package com.mysql.jdbc does not exist
import com.mysql.jdbc.Driver;
                     ^
MySQL.java:31: error: package com.mysql.jdbc does not exist
      DriverManager.registerDriver(new com.mysql.jdbc.Driver());
                                                     ^

I rewrote the MySQL.java program as follows, and it works on both implementations:

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// Import classes.
import java.sql.*;
 
/* You can't include the following on Linux without raising an exception. */
// import com.mysql.jdbc.Driver;
 
public class MySQL {
  public MySQL() {
    /* Declare variables that require explicit assignments because
       they're addressed in the finally block. */
    Connection conn = null;
    Statement stmt = null;
    ResultSet rset = null;
 
    /* Declare other variables. */
    String url;
    String username = "student";
    String password = "student";
    String database = "studentdb";
    String hostname = "localhost";
    String port = "3306";
    String sql;
 
    /* Attempt a connection. */
    try {
      // Set URL.
      url = "jdbc:mysql://" + hostname + ":" + port + "/" + database;
 
      // Create instance of MySQL.
      Class.forName ("com.mysql.jdbc.Driver").newInstance();
      conn = DriverManager.getConnection (url, username, password);
 
      // Query the version of the database.
      sql = "SELECT version()";
      stmt = conn.createStatement();
      rset = stmt.executeQuery(sql);
 
      System.out.println ("Database connection established");
 
      // Read row returns for one column.
      while (rset.next()) {
        System.out.println("MySQL Version [" + rset.getString(1) + "]"); }
 
    }
    catch (SQLException e) {
      System.err.println ("Cannot connect to database server:");
      System.out.println(e.getMessage());
    }
    catch (ClassNotFoundException e) {
      System.err.println ("Cannot connect to database server:");
      System.out.println(e.getMessage());
    }
    catch (InstantiationException e) {
      System.err.println ("Cannot connect to database server:");
      System.out.println(e.getMessage());
    }
    catch (IllegalAccessException e) {
      System.err.println ("Cannot connect to database server:");
      System.out.println(e.getMessage());
    }
    finally {
      if (conn != null) {
        try {
          rset.close();
          stmt.close();
          conn.close();
          System.out.println ("Database connection terminated");
        }
        catch (Exception e) { /* ignore close errors */ }
      }
    }
  }
  /* Unit test. */
  public static void main(String args[]) {
    new MySQL();
  }
}

The old approach to the DriverManager and Driver classes disallows the use of three of the exceptions in the sample code: ClassNotFoundException, InstantiationException, and IllegalAccessException classes. The new syntax works on Linux, Mac OS X, and Windows. If you’re running on Mac OS X, you need to import the following additional library in the MySQL.java program:

import com.apple.eawt.*;

Before you compile the MySQL.java program, you need to put the mysql-connector-java.jar and your present working directory into your environment’s $CLASSPATH variable. You can set the $CLASSPATH variable at the command-line or embed the following in your .bashrc file:

export CLASSPATH=/usr/share/java/mysql-connector-java.jar:.

If you embedded it in the .bashrc file, you need to source that file or restart your terminal session, which resources the .bashrc for you. You can source your .bashrc file from an active Terminal session in your home directory with this syntax:

. ./.bashrc

If you’re new to Java and the MySQL Connector/J, you compile the MySQL.java program with the following syntax. At least, it works when you have the MySQL.java source file in the present working directory and want to create the class file in the same directory. You can find more about the javac command-line at the www.tutorialpoint.com web site>

javac -verbose -cp . MySQL.java

Then, you can run it with the class file with this syntax:

java MySQL

It should return the following:

Database connection established
MySQL Version [5.6.24]
Database connection terminated

If you’d prefer to return data, you can replace line 34 in the MySQL.java program with a query against a table, like:

34
      sql = "SELECT item_title, item_rating FROM item";

Then, change line 42 in the MySQL.java program with syntax to manage the output, like:

42
        System.out.println(rset.getString(1) + ", " + rset.getString(2)); }

Recompile it, and rerun the MySQL class file with this syntax:

java MySQL

It should return the following:

Database connection established
The Hunt for Red October, PG
Star Wars I, PG
Star Wars II, PG
Star Wars II, PG
Star Wars III, PG13
The Chronicles of Narnia, PG
RoboCop, Mature
Pirates of the Caribbean, Teen
The Chronicles of Narnia, Everyone
MarioKart, Everyone
Splinter Cell, Teen
Need for Speed, Everyone
The DaVinci Code, Teen
Cars, Everyone
Beau Geste, PG
I Remember Mama, NR
Tora! Tora! Tora!, G
A Man for All Seasons, G
Hook, PG
Around the World in 80 Days, G
Harry Potter and the Chamber of Secrets, PG
Camelot, G
Database connection terminated

As always, I hope this helps those looking for a solution.

Written by maclochlainn

April 17th, 2015 at 5:16 pm