Archive for the ‘Linux’ Category
Linux User-Group Console
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
- You navigate to the Applications menu, and choose Sundry from the menu list and Users and Groups from the menu item to continue.
- You will be prompted for the sudoer’s password in this dialog.
- 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.
Fix VMware Networking
Occasionally, my students loose their network connection when copying their virtual machines. This article shows you how to rebuild your Internet connection.
The first step requires you to identify the port number on your host operating system, which is typically Windows OS or Mac OS X. You can find that by running the following search from a Mac OS X Terminal session or Windows OS Command session.
If you’re on the Mac OS X, you launch a Terminal session and then use the sudo command to open a shell as the root super user, like this:
sudo sh |
As the root super user on Mac OS X , you run the netstat command like this:
sh-3.2# netstat -a | grep 1.ntp | grep -v grep udp4 0 0 192.168.147.1.ntp *.* |
VMware uses the same subdomain with one difference for the gateway, it uses node 2:
192.168.147.2 |
The alternate syntax to find Vmware’s subdomain requires you to use an Administrator account on Windows, like this:
C:\> netstat -a | findstr /C:.ntp |
After you determine the subdomain, you need to ensure VMware is configured correctly. You navigate to the menu and choose Virtual Machine and then Settings from the dropdown menu. The software shows you the following:
Then, click on the Network Adapter under the Removable Devices, and you see the following screen:
You need to make sure that you’re using Internet Sharing, or Share with my Mac. If you’re not using it select it now.
Launch the hosted Linux OS and open a Terminal seesion. Inside the Terminal, you should find the machine’s address as the root address with the ifconfig utility. The technique follows:
[student@localhost ~]$ sudo sh [sudo] password for student: sh-4.2# ifconfig eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 00:0c:29:70:77:64 txqueuelen 1000 (Ethernet) RX packets 34 bytes 4190 (4.0 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 0 (Local Loopback) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 |
Next, you need to edit some files, they assume the VMware Network Gateway is 192.168.147.2 and the machine’s address is “00:0c:29:70:77:64“. The first file you need to edit is the /etc/resolv.conf file, and it should look like this:
domain localdomain search localdomain nameserver 192.168.147.2 |
The second file you need to edit is the /etc/sysconfig/network file. It should look like this:
# Created by anaconda NETWORKING=yes HOSTNAME=localhost.localdomain GATEWAY=192.168.147.2 |
The third file you need to edit is the /etc/sysconfig/network-scripts/ifcfg-eth0 file. It should look like this:
DEVICE=eth0 HWADDR=00:0c:29:70:77:64 ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=dhcp TYPE=Ethernet DNS1=192.168.147.2 USERCTL=no PEERDNS=yes IPV6INIT=no |
The last step requires that you reboot the machine or run the /etc/rc.d/init.d/network to restart the network. I hope this helps those trying to restore their VMware hosted operating systems network connection.
Fedora LAMP Steps
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:
- Go to this blog post and install the
httpdandphplibraries with theyuminstaller. - In the same blog post as step 1 (you can put the sample PHP code into the
/var/www/htmldirectory for testing), connect to theyumshell and remove thephp-mysqllibrary and then install themysqlndlibrary. - Go to this blog post and install the
php-gdlibraries, which enable you to render PNG images stored as binary streams in MySQL.
As always, I hope that helps.
Mac SQL Developer Install
This how you install SQL Developer on Mac OS Yosemite. The first thing you need to do is download and install Java 8, not Java 7 on your Mac OS Yosemite as suggested on some web sites. You can determine whether or not Java is installed by running the following command:
Mac-Pro-3:~ username$ java -version No Java runtime present, requesting install. |
You must accept the Java license to install Java 8 on the Mac OS X operating system:
You have the option of installing the Java SDK or JDK. I’ve opted to install Netbeans 8 with JDK 8u45, as you can tell from the screen capture after you launched the file:
It is a standard Mac OS installation, which is why I didn’t bother showing any dialog messages. After installing the Java JDK or SDK, you should download SQL Developer 4.1 from Oracle’s web site. Below is a screen shot of the Oracle download web page where I’ve accepted the license agreement:
If you attempt to launch the installation and you’ve set your Mac Security to the “Mac App Store and identified developers” setting, you should raise the following exception:
If you reset the Mac Security to an “Anywhere” setting, you can install Oracle SQL Developer on Yosemite. Just make sure you reset it to the “Mac App Store and identified developers” setting after you install SQL Developer.
If you launch SQL Developer with the Security “Anywhere” setting, it displays the following dialog:
After you launch the program, you will see the following progress dialog:
The last step of the installation launches SQL Developer, as shown below:
Click the Connections icon to create an initial connection, like the following:
After connecting to the database, you can write and execute a query as shown in the next screen capture:
As always, I hope that this helps those who require an example to install SQL Server on a Mac OS.
Run X11 Apps on Mac
It’s possible folks didn’t notice but Mac OS X no longer includes XQuartz by default from Maverick forward. You need to download XQuartz and install it. I’d recommend after you install Xcode.
Launch XQuartz and then either use the bash shell it opens or open a Terminal bash shell session. Inside the shell, you might start Secure Shell (ssh) like this:
Mac-Pro-3:~ michaelmclaughlin$ ssh student@192.168.2.170 student@192.168.2.170's password: Last login: Thu Jun 4 14:33:37 2015 [student@localhost ~]$ xclock & [1] 10422 [student@localhost ~]$ Error: Can't open display: |
Granted that’s a trivial error and running the xclock X11 applications isn’t crucial, an error that makes it more important is the following from Oracle’s old Designer/2000 application:
FRM-91111: Internal Error: window system startup failure. FRM-10039: Unable to start up the Form Builder. |
This is the desired behavior. Secure shell (ssh) can’t run it unless you make the connection with the -Y flag. You should use the following syntax:
Mac-Pro-3:~ michaelmclaughlin$ ssh -Y student@192.168.2.170 student@192.168.2.170's password: Last login: Tue Jun 9 14:56:55 2015 from 192.168.2.1 /usr/bin/xauth: file /home/student/.Xauthority does not exist [student@localhost ~]$ xclock & [1] 10760 |
You can safely ignore the .Xauthority does not exist warning message because it’ll create a .Xauthority file and store the magic cookie after the warning message. You should see the xclock program running in the upper left hand corner of your console, like:
It’s terrific that you don’t get a font warning like you typically would using UTF-8 on Linux. Nice that the Mac OS fonts are so well done that there isn’t a raised exception.
Using xclock or xeyes isn’t very useful as a rule, but this method also lets you run any of the Linux GUI applications. For example, the following gedit command lets you run the gedit utility from a Mac OS console. If you’ve installed the gedit plug-ins, you also can use the Terminal console on the remote system.
The process sequence for the command-line is shown below:
1030 1 /usr/sbin/sshd -D - The root process launches the ssh daemon 3145 1030 sshd: student [priv] - The sshd launches a ssh session to manage a student ssh session 3152 3145 sshd: student@pts/1 - The ssh session launched to manage the ssh session 3166 3152 -bash - The bash shell launched by connecting through the ssh session 3240 3166 gedit - The gedit command issued inside a ssh session 3166 3240 gnome-pty-helper - Launching the gedit session across X11 3169 3240 /bin/bash - Launching the Terminal session inside the gedit session across X11 3269 3884 ps -ef - Command run inside the gedit Terminal session |
Hope that helps those who want to use X11 applications on the Mac OS.
Fedora X11 Install
While working through getting my Mac OS X to work with X11, I stumbled on some interesting errors and misdirection solutions. Like most things, the solution was straightforward. Then, it struck me that I hadn’t installed it on my Fedora image. This blog post show you the errors I got the way to get it to work, and how to install X11 on Fedora.
The first step requires discovering the package. If you remember xclock or xeyes are X-Windows programs, it’s quite easy with this command (though it may take a moment or two to run):
repoquery -q -f */xclock |
It will return something like this:
xorg-x11-apps-0:7.7-7.fc20.x86_64 |
You can then install X11 as a sudoer user with the yum utility like this:
sudo yum -y install xorg-x11-apps |
It should return this to your console:
Loaded plugins: langpacks, refresh-packagekit Resolving Dependencies --> Running transaction check ---> Package xorg-x11-apps.x86_64 0:7.7-7.fc20 will be installed --> Processing Dependency: xorg-x11-xbitmaps for package: xorg-x11-apps-7.7-7.fc20.x86_64 --> Running transaction check ---> Package xorg-x11-xbitmaps.noarch 0:1.1.1-6.fc20 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: xorg-x11-apps x86_64 7.7-7.fc20 fedora 305 k Installing for dependencies: xorg-x11-xbitmaps noarch 1.1.1-6.fc20 fedora 37 k Transaction Summary ================================================================================ Install 1 Package (+1 Dependent package) Total download size: 341 k Installed size: 949 k Downloading packages: (1/2): xorg-x11-apps-7.7-7.fc20.x86_64.rpm | 305 kB 00:01 (2/2): xorg-x11-xbitmaps-1.1.1-6.fc20.noarch.rpm | 37 kB 00:00 -------------------------------------------------------------------------------- Total 252 kB/s | 341 kB 00:01 Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : xorg-x11-xbitmaps-1.1.1-6.fc20.noarch 1/2 Installing : xorg-x11-apps-7.7-7.fc20.x86_64 2/2 Verifying : xorg-x11-apps-7.7-7.fc20.x86_64 1/2 Verifying : xorg-x11-xbitmaps-1.1.1-6.fc20.noarch 2/2 Installed: xorg-x11-apps.x86_64 0:7.7-7.fc20 Dependency Installed: xorg-x11-xbitmaps.noarch 0:1.1.1-6.fc20 Complete! |
After you install the xorg-x11-apps libraries, you can launch xclock. You should use the following syntax:
xclock & |
It should display something like the following on your console:
The warning message is typically because you’re running something like en_US.UTF-8 mode. You can find suitable X11 character sets by using the following command:
sudo yum search xorg-x11-fonts |
You can install all of them with the following command:
sudo yum -y install xorg-x11-fonts* |
However, at the end of the day the warning doesn’t go way. You should just ignore it.
Hope this helps those who want to install X11 on Fedora.
Bash Arrays & Oracle
Last week, I wrote about how to use bash arrays and the MySQL database to create unit and integration test scripts. While the MySQL example was nice for some users, there were some others who wanted me to show how to write bash shell scripts for Oracle unit and integration testing. That’s what this blog post does.
If you don’t know much about bash shell, you should start with the prior post to learn about bash arrays, if-statements, and for-loops. In this blog post I only cover how to implement a bash shell script that runs SQL scripts in silent mode and then queries the database in silent mode and writes the output to an external file.
I’ve copied the basic ERD for the example because of a request from a reader. In their opinion it makes cross referencing the two posts unnecessary.
To run the bash shell script, you’ll need the following SQL files, which you can see by clicking not he title below. There are several differences. For example, Oracle doesn’t support a DROP IF EXISTS syntax and requires you to write anonymous blocks in their PL/SQL language; and you must explicitly issue a QUIT; statement even when running in silent mode unlike MySQL, which implicitly issues an exit.
Setup SQL Files ↓
The actor.sql file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | -- Drop actor table and actor_s sequence. BEGIN FOR i IN (SELECT object_name , object_type FROM user_objects WHERE object_name IN ('ACTOR','ACTOR_S')) LOOP IF i.object_type = 'TABLE' THEN EXECUTE IMMEDIATE 'DROP TABLE ' || i.object_name || ' CASCADE CONSTRAINTS'; ELSIF i.object_type = 'SEQUENCE' THEN EXECUTE IMMEDIATE 'DROP SEQUENCE ' || i.object_name; END IF; END LOOP; END; / -- Create an actor table. CREATE TABLE actor ( actor_id NUMBER CONSTRAINT actor_pk PRIMARY KEY , actor_name VARCHAR(30) NOT NULL ); -- Create an actor_s sequence. CREATE SEQUENCE actor_s; -- Insert two rows. INSERT INTO actor VALUES (actor_s.NEXTVAL,'Chris Hemsworth'); INSERT INTO actor VALUES (actor_s.NEXTVAL,'Chris Pine'); INSERT INTO actor VALUES (actor_s.NEXTVAL,'Chris Pratt'); -- Quit session. QUIT; |
The film.sql file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | -- Drop film table and film_s sequence. BEGIN FOR i IN (SELECT object_name , object_type FROM user_objects WHERE object_name IN ('FILM','FILM_S')) LOOP IF i.object_type = 'TABLE' THEN EXECUTE IMMEDIATE 'DROP TABLE ' || i.object_name || ' CASCADE CONSTRAINTS'; ELSIF i.object_type = 'SEQUENCE' THEN EXECUTE IMMEDIATE 'DROP SEQUENCE ' || i.object_name; END IF; END LOOP; END; / -- Create a film table. CREATE TABLE film ( film_id NUMBER CONSTRAINT film_pk PRIMARY KEY , film_name VARCHAR(30) NOT NULL ); -- Create an actor_s sequence. CREATE SEQUENCE film_s; -- Insert four rows. INSERT INTO film VALUES (film_s.NEXTVAL,'Thor'); INSERT INTO film VALUES (film_s.NEXTVAL,'Thor: The Dark World'); INSERT INTO film VALUES (film_s.NEXTVAL,'Star Trek'); INSERT INTO film VALUES (film_s.NEXTVAL,'Star Trek into Darkness'); INSERT INTO film VALUES (film_s.NEXTVAL,'Guardians of the Galaxy'); -- Quit session. QUIT; |
The movie.sql file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | -- Drop movie table and movie_s sequence. BEGIN FOR i IN (SELECT object_name , object_type FROM user_objects WHERE object_name IN ('MOVIE','MOVIE_S')) LOOP IF i.object_type = 'TABLE' THEN EXECUTE IMMEDIATE 'DROP TABLE ' || i.object_name || ' CASCADE CONSTRAINTS'; ELSIF i.object_type = 'SEQUENCE' THEN EXECUTE IMMEDIATE 'DROP SEQUENCE ' || i.object_name; END IF; END LOOP; END; / -- Create an movie table. CREATE TABLE movie ( movie_id NUMBER CONSTRAINT movie_pk PRIMARY KEY , actor_id NUMBER CONSTRAINT movie_nn1 NOT NULL , film_id NUMBER CONSTRAINT movie_nn2 NOT NULL , CONSTRAINT actor_fk FOREIGN KEY (actor_id) REFERENCES actor (actor_id) , CONSTRAINT film_fk FOREIGN KEY (film_id) REFERENCES film(film_id)); -- Create table constraint. CREATE SEQUENCE movie_s; -- Insert translation rows. INSERT INTO movie VALUES ( movie_s.NEXTVAL ,(SELECT actor_id FROM actor WHERE actor_name = 'Chris Hemsworth') ,(SELECT film_id FROM film WHERE film_name = 'Thor')); INSERT INTO movie VALUES ( movie_s.NEXTVAL ,(SELECT actor_id FROM actor WHERE actor_name = 'Chris Hemsworth') ,(SELECT film_id FROM film WHERE film_name = 'Thor: The Dark World')); INSERT INTO movie VALUES ( movie_s.NEXTVAL ,(SELECT actor_id FROM actor WHERE actor_name = 'Chris Pine') ,(SELECT film_id FROM film WHERE film_name = 'Star Trek')); INSERT INTO movie VALUES ( movie_s.NEXTVAL ,(SELECT actor_id FROM actor WHERE actor_name = 'Chris Pine') ,(SELECT film_id FROM film WHERE film_name = 'Star Trek into Darkness')); INSERT INTO movie VALUES ( movie_s.NEXTVAL ,(SELECT actor_id FROM actor WHERE actor_name = 'Chris Pratt') ,(SELECT film_id FROM film WHERE film_name = 'Guardians of the Galaxy')); -- Quit session. QUIT; |
The tables.sql file, lets you verify the creation of the actor, film, and movie tables:
1 2 3 4 5 6 7 8 9 | -- Set Oracle column width. COL table_name FORMAT A30 HEADING "Table Name" -- Query the tables. SELECT table_name FROM user_tables; -- Exit SQL*Plus. QUIT; |
The results.sql file, lets you see join results from actor, film, and movie tables:
1 2 3 4 5 6 7 8 9 10 11 | -- Format query. COL film_actors FORMAT A40 HEADING "Actors in Films" -- Diagnostic query. SELECT a.actor_name || ', ' || f.film_name AS film_actors FROM actor a INNER JOIN movie m ON a.actor_id = m.actor_id INNER JOIN film f ON m.film_id = f.film_id; -- Quit the session. QUIT; |
If you don’t have a sample test schema to use to test this script, you can create a sample schema with the following create_user.sql file. The file depends on the existence of a users and temp tablespace.
Click the link below to see the source code for a script that let’s you create a sample user account as the system user:
Create sample User SQL File ↓
You can use the dbms_metadata.get_ddl function to discover the existence of the tablespaces. The following SQL syntax returns the SQL DDL statement that created a users or temp tablespace:
1 2 | SET LONG 200000 SELECT dbms_metadata.get_ddl('TABLESPACE','USERS') FROM dual; |
You create the sample database with the following SQL statements:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | -- Drop the sample user table. BEGIN FOR i IN (SELECT username FROM dba_users WHERE username = 'SAMPLE') LOOP EXECUTE IMMEDIATE 'DROP USER ' || i.username || ' CASCADE'; END LOOP; END; / -- Create the sample user table. CREATE USER sample IDENTIFIED BY sample DEFAULT TABLESPACE users TEMPORARY TABLESPACE temp QUOTA 50M ON users; -- Grant privileges to sample user. GRANT CREATE CLUSTER, CREATE INDEXTYPE, CREATE OPERATOR , CREATE PROCEDURE, CREATE SEQUENCE, CREATE SESSION , CREATE TABLE, CREATE TRIGGER, CREATE TYPE , CREATE VIEW TO sample; |
The following list_oracle.sh shell script expects to receive the username, password, and fully qualified path in that specific order. The script names are entered manually in the array because this should be a unit test script.
This is an insecure version of the list_oracle.sh script because you provide the password on the command line. It’s better to provide the password as you run the script.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | #!/usr/bin/bash # Assign user and password username="${1}" password="${2}" directory="${3}" echo "User name:" ${username} echo "Password: " ${password} echo "Directory:" ${directory} # Define an array. declare -a cmd # Assign elements to an array. cmd[0]="actor.sql" cmd[1]="film.sql" cmd[2]="movie.sql" # Call the array elements. for i in ${cmd[*]}; do sqlplus -s ${username}/${password} @${directory}/${i} > /dev/null done # Connect and pipe the query result minus errors and warnings to the while loop. sqlplus -s ${username}/${password} @${directory}/tables.sql 2>/dev/null | # Read through the piped result until it's empty. while IFS='\n' read actor_name; do echo $actor_name done # Connect and pipe the query result minus errors and warnings to the while loop. sqlplus -s ${username}/${password} @${directory}/result.sql 2>/dev/null | # Read through the piped result until it's empty. while IFS='\n' read actor_name; do echo $actor_name done |
The IFS (Internal Field Separator) works with whitespace by default. The IFS on lines 29 and 37 sets the IFS to a line return ('\n'). That’s the trick to display the data, and you can read more about the IFS in this question and answer post.
You can run the shell script with the following syntax:
./list_oracle.sh sample sample /home/student/Code/bash/oracle > output.txt |
You can then display the results from the output.txt file with the following command:
cat output.txt command: |
It will display the following output:
User name: sample Password: sample Directory: /home/student/Code/bash/oracle Table Name ------------------------------ MOVIE FILM ACTOR Actors in Films ---------------------------------------- Chris Hemsworth, Thor Chris Hemsworth, Thor: The Dark World Chris Pine, Star Trek Chris Pine, Star Trek into Darkness Chris Pratt, Guardians of the Galaxy |
As always, I hope this helps those looking for a solution.
Bash Arrays & MySQL
Student questions are always interesting! They get me to think and to write. The question this time is: “How do I write a Bash Shell script to process multiple MySQL script files?” This post builds the following model (courtesy of MySQL Workbench) by using a bash shell script and MySQL script files, but there’s a disclaimer on this post. It shows both insecure and secure approaches and you should avoid the insecure ones.
It seems a quick refresher on how to use arrays in bash shell may be helpful. While it’s essential in a Linux environment, it’s seems not everyone masters the bash shell.
Especially, since I checked my Learning the Bash Shell (2nd Edition) and found a typo on how you handle arrays in the bash shell, and it’s a mistake that could hang newbies up (on page 161). Perhaps I should update my copy because I bought it in 1998. 😉 It was good then, and the new edition is probably better. The error is probably corrected in the current Learning the Bash Shell, but if not, the following examples show you how to use arrays in loops.
Naturally, these do presume some knowledge of working with bash shell, like the first line always is the same in any bash shell script. That you open an if-statement with an if and close it with a fi, and that you else-if is elif; and that a semicolon between a for-statement and the do statement is required when they’re on the same line because they’re two statements.
If you’re new to bash shell arrays, click on the link below to expand a brief tutorial. It takes you through three progressive examples of working with bash arrays.
Working with bash Arrays ↓
A basic example of working with an array in bash shell is the following list1.sh script:
1 2 3 4 5 6 7 8 9 10 11 12 13 | #!/usr/bin/bash # Print script name. echo $0 #!/usr/bin/bash # Define an array. declare -a cmd=("one" "two" "three") # Call the array elements. for i in ${cmd[*]}; do echo ${i} done |
Line 8 declares the cmd array by assigning three strings. Line 12 returns the elements of the array to the ${i} variable, which lets you manage them one at a time. You use the chmod command to make the list1.sh executable, like this:
chmod 755 list1.sh |
Then, you can run it like this from the present working directory (pwd):
./list1.sh |
It should print:
one two three |
The list2.sh example changes the cmd array declaration from list1.sh. It declares the cmd array as an empty array, and then it assigns elements by index numbers (using a zero-based index), as shown below:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/usr/bin/bash # Define an array. declare -a cmd # Assign elements to an array. cmd[0]="one" cmd[1]="two" cmd[2]="three" # Call the array elements. for i in ${cmd[*]}; do echo ${i} done |
Lines 7 through 9 assign values to the elements of the cmd array. You would chmod the file, and run the file as qualified above for the list1.sh script.
The last pre-implementation example requires that you create three demonstration scripts, the one.sh, two.sh, and three.sh scripts. You should put them in the same directory as the list3.sh script.
The demonstration scripts should all have the same code, like this:
1 2 3 4 | #!/usr/bin/bash # Print script name. echo $0 |
Line 4 returns command line parameter $0 or ${0}, which is always the command line program’s file name. The file name may be provided as a relative or absolute file name, and if that’s new to you please check out The Linux Command Line: A Complete Introduction (also downloadable as a PDF for free).
The list3.sh script should contain the following:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/usr/bin/bash <code> # Define an array. declare -a cmd # Assign elements to an array. cmd[0]="one.sh" cmd[1]="two.sh" cmd[2]="three.sh" # Call the array elements. for i in ${cmd[*]}; do `pwd`/${i} done |
When you run the list3.sh script from the /home/student/Code/bash directory with a local syntax, the script should return the fully qualified file names of the subshell programs. The output should look like this:
/home/student/Code/bash/one.sh /home/student/Code/bash/two.sh /home/student/Code/bash/three.sh |
The list3.sh script provides the present working directory (pwd) and the one.sh, two.sh, and three.sh scripts return only their executable name. For example, if you ran one.sh with the following syntax:
./one.sh |
It returns
./one.sh |
Only one more trick needs to be qualified before our main MySQL examples. That trick is how you pass parameters to a bash shell script. For reference, this is the part that’s insecure because user command histories are available inside the Linux OS.
Here’s a hello_whom.sh script to demonstrates the concept of parameter passing:
1 2 3 4 5 6 7 8 9 10 | #!/usr/bin/bash # This says hello to the argument while managing no argument. if [[ ${#} = 1 ]]; then echo 'The '${0}' program says: "Hello '${1}'!"' elif [[ ${#} > 1 ]]; then echo 'The '${0}' program wants to know if you have more than one name?' else echo 'The '${0}' program wants to know if you have a name?' fi |
If you need more on how parameters are passed and managed, you can check a prior blob post on Handling bash Parameters, or check the bash help pages. The following leverages bash arrays to run scripts and query the MySQL database from the command line.
You will need the three batch SQL files first, so here they are:
Setup SQL Files ↓
The actor.sql file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | -- Use the sampledb database. USE sampledb; -- Disable foreign key checking. SET foreign_key_checks = 0; -- Drop an actor table. DROP TABLE IF EXISTS actor; -- Create an actor table. CREATE TABLE actor ( actor_id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT , actor_name VARCHAR(30) NOT NULL ); -- Insert two rows. INSERT INTO actor (actor_name) VALUES ('Chris Hemsworth'); INSERT INTO actor (actor_name) VALUES ('Chris Pine'); INSERT INTO actor (actor_name) VALUES ('Chris Pratt'); |
The film.sql file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | -- Use the sampledb database. USE sampledb; -- Disable foreign key checking. SET foreign_key_checks = 0; -- Drop a film table. DROP TABLE IF EXISTS film; -- Create a film table. CREATE TABLE film ( film_id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT , film_name VARCHAR(30) NOT NULL ); -- Insert rows. INSERT INTO film (film_name) VALUES ('Thor'); INSERT INTO film (film_name) VALUES ('Thor: The Dark World'); INSERT INTO film (film_name) VALUES ('Star Trek'); INSERT INTO film (film_name) VALUES ('Star Trek into Darkness'); INSERT INTO film (film_name) VALUES ('Guardians of the Galaxy'); |
The movie.sql file:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | -- Use the sampledb database. USE sampledb; -- Disable foreign key checking. SET foreign_key_checks = 0; -- Drop an movie table. DROP TABLE IF EXISTS movie; -- Create an movie table. CREATE TABLE movie ( movie_id int unsigned PRIMARY KEY AUTO_INCREMENT , actor_id int unsigned NOT NULL , film_id int unsigned NOT NULL , CONSTRAINT actor_fk FOREIGN KEY (actor_id) REFERENCES actor (actor_id) , CONSTRAINT film_fk FOREIGN KEY (film_id) REFERENCES film(film_id)); -- Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actor_id , film_id ) VALUES ((SELECT actor_id FROM actor WHERE actor_name = 'Chris Hemsworth') ,(SELECT film_id FROM film WHERE film_name = 'Thor')); -- Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actor_id , film_id ) VALUES ((SELECT actor_id FROM actor WHERE actor_name = 'Chris Hemsworth') ,(SELECT film_id FROM film WHERE film_name = 'Thor: The Dark World')); -- Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actor_id , film_id ) VALUES ((SELECT actor_id FROM actor WHERE actor_name = 'Chris Pine') ,(SELECT film_id FROM film WHERE film_name = 'Star Trek')); -- Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actor_id , film_id ) VALUES ((SELECT actor_id FROM actor WHERE actor_name = 'Chris Pine') ,(SELECT film_id FROM film WHERE film_name = 'Star Trek into Darkness')); -- Use scalar subqueries to discover surrogate keys by using the faux natural key. INSERT INTO movie ( actor_id , film_id ) VALUES ((SELECT actor_id FROM actor WHERE actor_name = 'Chris Pratt') ,(SELECT film_id FROM film WHERE film_name = 'Guardians of the Galaxy')); |
The following list_mysql.sh shell script expects to receive the username, password, database and fully qualified path in that specific order. The script names are entered manually because this should be a unit test script. Naturally, you can extend the script to manage those parameters but as mentioned I see this type of solution as a developer machine only script to simplify unit testing. Anything beyond that is risky!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #!/usr/bin/bash # Assign user and password username="${1}" password="${2}" database="${3}" directory="${4}" # List the parameter values passed. echo "Username: " ${username} echo "Password: " ${password} echo "Database: " ${database} echo "Directory: " ${directory} echo "" # Define an array. declare -a cmd # Assign elements to an array. cmd[0]="actor.sql" cmd[1]="film.sql" cmd[2]="movie.sql" # Call the array elements. for i in ${cmd[*]}; do mysql -s -u${username} -p${password} -D${database} < ${directory}/${i} > /dev/null 2>/dev/null done # Connect and pipe the query result minus errors and warnings to the while loop. mysql -u${username} -p${password} -D${database} <<<'show tables' 2>/dev/null | # Read through the piped result until it's empty but format the title. while IFS='\n' read list; do if [[ ${list} = "Tables_in_sampledb" ]]; then echo $list echo "----------------------------------------" else echo $list fi done echo "" # Connect and pipe the query result minus errors and warnings to the while loop. mysql -u${username} -p${password} -D${database} <<<'SELECT CONCAT(a.actor_name," in ",f.film_name) AS "Actors in Films" FROM actor a INNER JOIN movie m ON a.actor_id = m.actor_id INNER JOIN film f ON m.film_id = f.film_id' 2>/dev/null | # Read through the piped result until it's empty but format the title. while IFS='\n' read actor_name; do if [[ ${actor_name} = "Actors in Films" ]]; then echo $actor_name echo "----------------------------------------" else echo $actor_name fi done |
The IFS (Internal Field Separator) works with whitespace by default. The IFS on lines 33 and 47 sets the IFS to a line return ('\n'). That’s the trick to display the data, and you can read more about the IFS in this question and answer post.
You can run this script with the following input parameters from the local directory where you deploy it. The a parameters are: (1) username, (2) password, (3) database, and (4) a fully qualified path to the SQL setup files.
./list_mysql.sh student student sampledb "/home/student/Code/bash/mysql" |
With valid input values, the list_mysql.sh bash script generates the following output, which confirms inputs and verifies actions taken by the scripts with queries:
Username: student Password: student Database: sampledb Directory: /home/student/Code/bash/mysql Tables_in_sampledb ---------------------------------------- actor film movie Actors in Films ---------------------------------------- Chris Hemsworth in Thor Chris Hemsworth in Thor: The Dark World Chris Pine in Star Trek Chris Pine in Star Trek into Darkness Chris Pine in Guardians of the Galaxy |
If you forgot to provide the required inputs to the list_mysql.sh bash script, it alternatively returns the following output:
Username: Password: Database: Directory: ./list_mysql.sh: line 25: /actor.sql: No such file or directory ./list_mysql.sh: line 25: /film.sql: No such file or directory ./list_mysql.sh: line 25: /movie.sql: No such file or directory |
The secure way removes the password at a minimum! The refactored program will require you to manually enter the password for all elements of the array (three in this sample), and twice for the two queries. Here’s the refactored code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | #!/usr/bin/bash # Assign user and password username="${1}" database="${2}" directory="${3}" # List the parameter values passed. echo "Username: " ${username} echo "Database: " ${database} echo "Directory: " ${directory} echo "" # Define an array. declare -a cmd # Assign elements to an array. cmd[0]="actor.sql" cmd[1]="film.sql" cmd[2]="movie.sql" # Call the array elements. for i in ${cmd[*]}; do mysql -s -u${username} -p -D${database} < ${directory}/${i} > /dev/null 2>/dev/null done # Connect and pipe the query result minus errors and warnings to the while loop. mysql -u${username} -p -D${database} <<<'show tables' 2>/dev/null | # Read through the piped result until it's empty. while IFS='\n' read list; do if [[ ${list} = "Tables_in_sampledb" ]]; then echo $list echo "----------------------------------------" else echo $list fi done echo "" # Connect and pipe the query result minus errors and warnings to the while loop. mysql -u${username} -p -D${database} <<<'SELECT CONCAT(a.actor_name," in ",f.film_name) AS "Actors in Films" FROM actor a INNER JOIN movie m ON a.actor_id = m.actor_id INNER JOIN film f ON m.film_id = f.film_id' 2>/dev/null | # Read through the piped result until it's empty. while IFS='\n' read actor_name; do if [[ ${actor_name} = "Actors in Films" ]]; then echo $actor_name echo "----------------------------------------" else echo $actor_name fi done |
Please let me know if you think there should be any more scaffolding for newbies in this post. As always, I hope this helps those looking for this type of solution.
Add Gedit Plugins
Fedora comes with vim and gedit installed but the gedit installation is bare bones. You can update gedit to include supplemental Plug-ins with the following yum command as the root user:
yum install -y gedit-plugins |
It generates the following log file:
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 (1/2): pgdg93/20/x86_64/primary_db | 86 kB 00:00 (2/2): updates/20/x86_64/primary_db | 11 MB 00:03 (1/2): updates/20/x86_64/pkgtags | 1.5 MB 00:00 (2/2): updates/20/x86_64/updateinfo | 2.0 MB 00:01 Resolving Dependencies --> Running transaction check ---> Package gedit-plugins.x86_64 0:3.10.1-1.fc20 will be installed --> Processing Dependency: libgit2-glib for package: gedit-plugins-3.10.1-1.fc20.x86_64 --> Running transaction check ---> Package libgit2-glib.x86_64 0:0.0.6-2.fc20 will be installed --> Processing Dependency: libgit2.so.0()(64bit) for package: libgit2-glib-0.0.6-2.fc20.x86_64 --> Running transaction check ---> Package libgit2.x86_64 0:0.19.0-2.fc20 will be installed --> Processing Dependency: libxdiff.so.1()(64bit) for package: libgit2-0.19.0-2.fc20.x86_64 --> Processing Dependency: libhttp_parser.so.2()(64bit) for package: libgit2-0.19.0-2.fc20.x86_64 --> Running transaction check ---> Package http-parser.x86_64 0:2.0-5.20121128gitcd01361.fc20 will be installed ---> Package libxdiff.x86_64 0:1.0-3.fc20 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: gedit-plugins x86_64 3.10.1-1.fc20 updates 830 k Installing for dependencies: http-parser x86_64 2.0-5.20121128gitcd01361.fc20 fedora 23 k libgit2 x86_64 0.19.0-2.fc20 fedora 281 k libgit2-glib x86_64 0.0.6-2.fc20 fedora 82 k libxdiff x86_64 1.0-3.fc20 fedora 33 k Transaction Summary ================================================================================ Install 1 Package (+4 Dependent packages) Total download size: 1.2 M Installed size: 5.2 M Downloading packages: (1/5): http-parser-2.0-5.20121128gitcd01361.fc20.x86_64.rpm | 23 kB 00:00 (2/5): libgit2-0.19.0-2.fc20.x86_64.rpm | 281 kB 00:00 (3/5): libgit2-glib-0.0.6-2.fc20.x86_64.rpm | 82 kB 00:00 (4/5): libxdiff-1.0-3.fc20.x86_64.rpm | 33 kB 00:00 (5/5): gedit-plugins-3.10.1-1.fc20.x86_64.rpm | 830 kB 00:01 -------------------------------------------------------------------------------- Total 899 kB/s | 1.2 MB 00:01 Running transaction check Running transaction test Transaction test succeeded Running transaction (shutdown inhibited) Installing : libxdiff-1.0-3.fc20.x86_64 1/5 Installing : http-parser-2.0-5.20121128gitcd01361.fc20.x86_64 2/5 Installing : libgit2-0.19.0-2.fc20.x86_64 3/5 Installing : libgit2-glib-0.0.6-2.fc20.x86_64 4/5 Installing : gedit-plugins-3.10.1-1.fc20.x86_64 5/5 Verifying : libgit2-0.19.0-2.fc20.x86_64 1/5 Verifying : libgit2-glib-0.0.6-2.fc20.x86_64 2/5 Verifying : gedit-plugins-3.10.1-1.fc20.x86_64 3/5 Verifying : http-parser-2.0-5.20121128gitcd01361.fc20.x86_64 4/5 Verifying : libxdiff-1.0-3.fc20.x86_64 5/5 Installed: gedit-plugins.x86_64 0:3.10.1-1.fc20 Dependency Installed: http-parser.x86_64 0:2.0-5.20121128gitcd01361.fc20 libgit2.x86_64 0:0.19.0-2.fc20 libgit2-glib.x86_64 0:0.0.6-2.fc20 libxdiff.x86_64 0:1.0-3.fc20 Complete! |
When you launch the gedit utility, you click on the
Gedit Plug-in Installation
- After you install the Gedit Plug-ins, you can configure the plug-ins by launching Gedit and then click on the
geditmenu option. Then, click on the Preferences menu option to enable the new plugins, like the Embedded Terminal plug-in.
- You have four tab options when working with the Preferences menu. The first tab is the View tab, as shown to the left.
- The second tab is the Editor tab, as shown to the left.
- The third tab is the Font & Colors tab, as shown to the left.
- The fourth tab is the Plugins tab, as shown to the left. Scroll down the list and check the Embedded Terminal and Python Console plug-ins’ checkbox. The Embedded Terminal lets you edit a file and have command line access to a Terminal session from the
geditmenu; and the Python Console session from thegeditmenu.
- Click on the View menu, and then choose the Bottom Panel menu option.
- After enabling the Bottom Panel in the Gedit menu, you can edit a file and click on the Terminal by simply clicking on the subpanel. You can see the split image on the left. There’s also a set of bottom tabs that lets you switch from a Linux Terminal session to the Python console.
As always, I hope this helps those working with gedit on the Fedora operating system.
Eclipse, Java, MySQL
While I previously blogged about installing Netbeans 8, some of my students would prefer to use the Eclipse IDE. This post shows how to install and configure Eclipse IDE, include the mysql-connector-java.jar, and write Java to access the MySQL.
You can download Eclipse IDE and then open it in Fedora’s Archive Manager. You can use the Archive Manager to Extract the Eclipse IDE to a directory of your choice. I opted to extract it into my student user’s home directory, which is /home/student.
After extracting the Eclipse IDE, you can check the contents of the eclipse directory with the following command:
ls -al eclipse |
You should see the following:
drwxrwxr-x. 8 student student 4096 May 8 22:16 . drwx------. 33 student student 4096 May 8 21:57 .. -rw-rw-r--. 1 student student 119194 Mar 20 07:10 artifacts.xml drwxrwxr-x. 11 student student 4096 May 8 22:16 configuration drwxrwxr-x. 2 student student 4096 Mar 20 07:10 dropins -rwxr-xr-x. 1 student student 78782 Mar 20 07:08 eclipse -rw-rw-r--. 1 student student 315 Mar 20 07:10 eclipse.ini -rw-rw-r--. 1 student student 60 Mar 17 15:11 .eclipseproduct drwxrwxr-x. 41 student student 4096 Mar 20 07:10 features -rwxr-xr-x. 1 student student 140566 Mar 20 07:08 icon.xpm drwxrwxr-x. 4 student student 4096 Mar 20 07:09 p2 drwxrwxr-x. 12 student student 40960 Mar 20 07:10 plugins drwxrwxr-x. 2 student student 4096 Mar 20 07:10 readme |
You can launch the Eclipse IDE with the following command-line from the eclipse directory:
./eclipse & |
While you can run this from the /home/student/eclipse directory, it’s best to create an alias for the Eclipse IDE in the student user’s .bashrc file:
# Set alias for Eclipse IDE tool. alias eclipse="/home/student/eclipse/eclipse" |
The next time you start the student user account, you can launch the Eclipse IDE by entering eclipse in the search box opened by clicking on the Activities menu.
The following steps take you through installing Eclipse on Fedora Linux, which is more or less the same as any Linux distribution. It’s very similar on Windows platforms too.
Eclipse Installation
- Navigate to eclipse.org/downloads web page to download the current version of the Eclipse software. Click the Linux 32 Bit or Linux 64 Bit link, as required for your operating system.
- Click the Green Arrow to download the Eclipse software.
- The next dialog gives you an option to open or save the software. Click the Open with radio button to open the archive file.
- This the Linux Archive Manager. Click the Extract button from the menu tab to open the archive file.
- This extract button on file chooser dialog to install Eclipse into the /home/student/eclipse directory. Click the Extract button to let the Archive Manager create a copy of those files.
- The Archive Manager presents a completion dialog. Click the Close button to close the Archive Manager.
After installing the Eclipse software, you can configure Eclipse. There are sixteen steps to setup the Eclipse product. You can launch the product with the
Eclipse Setup
You need to launch the Eclipse application to perform the following steps. The syntax is the following when you did create the alias mentioned earlier in the blog post:
eclipse & |
The following steps cover setting up your workspace, project, and adding the MySQL JDBC Java archive.
- The branding dialog may display for 30 or more seconds before the Eclipse software application launches.
- The Workspace Launcher opens first on a new installation. You need to designate a starting folder. I’m using
/home/student/workspaceas my Workspace. Click the OK button when you enter a confirmed workspace.
- After setting the Workspace Launcher, you open to the Eclipse Welcome page. Click second of the two icons on the left to open a working Eclipse environment. Alternatively, you can connect to Tutorials on the same page.
- From the developer view, click on the File menu option, the New option on the list, and the Java Project option on the floating menu. Eclipse will now create a new Java project.
- The New Java Project dialog lets you enter a project name and it also gives you the ability to set some basic configuration details. As a rule, you simply enter the Project Name and accept the defaults before clicking the Finish button.
- After creating the new Java project, Eclipse returns you to the Welcome page. Click second of the two icons on the left to open a working Eclipse environment.
- Now you should see the working environment. Sometimes it takes the full screen but initially it doesn’t. Navigate to the lower right hand side, and expand the window to full size.
- Now you should see the full screen view of the Eclipse working environment.
- Now you create a new Java class by navigating to the File menu options, then the New menu option, and finally choosing the Class floating menu.
- The New Java Class dialog requires you to provide some information about the Java object you’re creating. The most important thing is the Java class name.
- The only difference in this copy of the New Java Class dialog is that I’ve entered
HelloWorldas the Java Class’s name. Click the Finish button when you’re done.
- Eclipse should show you the following
HelloWorld.javafile. It’s missing amain()method. Add a static main() method to theHelloWorld.javaclass source file.
- This form shows the changes to the
HelloWorld.javafile. Specifically, it adds the It’s missing amain()method. Add a static main() method to theHelloWorld.javaclass source file.
- You can click the green arrow from the tool panel or you can click the Run menu option and Run submenu choice to test your program.
1 2 3 4
// Class definition. public class HelloWorld { public static void main(String args[]) { System.out.println("Hello World."); }}
- The Save and Launch dialog tells you that you’re ready to test creating a copy of the Java class file. Click the OK button to continue.
- The results from your program are written to the Console portion of the Eclipse IDE. This concludes the setup of a workspace, project, and deployment of actual Java classes.
Hello World.
Add MySQL JDBC Library
The following instructions add the MySQL Library and demonstrate how to write Java programs that connect to the MySQL database. They also use the mysql project.
- Navigate to the Project menu and choose the Properties menu option.
- The Properties menu option opens the Properties for the
mysqlproject on the Order and Export tab. Click the Libraries tab to add an external library.
- In the Libraries tab click the Add Library… button on the right to add an external library.
- In the JAR Selection dialog, click on Computer in the Places list, then click on usr, click on share, and click on java. The Name list should now include
mysql-connector-java.jarfile, and you should click on it before clicking on the OK button.
- You create new Java class file by clicking on the File menu. Then, you choose the New menu option and the Class menu option from the floating menu.
- Enter
MysqlConnectoras the name of the new Java class file and click the Finish button to continue.
- Eclipse generates the shell of the
MysqlConnectorclass as shown in the illustration to the left.
- You should replace the
MysqlConnectorclass shell with the code below. Then, click the green arrow or the Run menu and Run menu option to compile and run the new MysqlConnector Java class file.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class MysqlConnector extends Object { public static void main(String[] args) { try { /* The newInstance() call is a work around for some broken Java implementations. */ Class.forName("com.mysql.jdbc.Driver").newInstance(); /* Verify the Java class path. */ System.out.println("===================="); System.out.println("CLASSPATH [" + System.getProperty("java.class.path") + "]"); System.out.println("===================="); } catch (Exception e) {} finally { /* Verify the Java class path. */ System.out.println("===================="); System.out.println("CLASSPATH [" + System.getProperty("java.class.path") + "]"); System.out.println("===================="); } } }
- The Save and Launch dialog informs you are saving a
MysqlConnector.javafile to yourmysqlproject. Click the OK button to continue.
- The next screen shows that the program successfully connected to the MySQL database by printing the following information to the Console output tab.
==================== CLASSPATH [/home/student/Code/workspace/MySQL/bin:/usr/share/java/mysql-connector-java.jar] ==================== ==================== CLASSPATH [/home/student/Code/workspace/MySQL/bin:/usr/share/java/mysql-connector-java.jar] ====================
- Instead of repeating steps #5 through #10, the image displays the testing of the MysqlResults class file. The code follows below:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76
/* Import the java.sql.* package. */ import java.sql.*; /* You can't include the following on Linux without raising an exception. */ // import com.mysql.jdbc.Driver; public class MySQLResult { public MySQLResult() { /* 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, relies on *_ri2.sql scripts. sql = "SELECT i.item_title, ra.rating FROM item i INNER JOIN rating_agency ra ON i.item_rating_id = ra.rating_agency_id"; 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(rset.getString(1) + ", " + rset.getString(2)); } } catch (SQLException e) { System.err.println ("Cannot connect to database server (SQLException):"); System.out.println(e.getMessage()); } catch (ClassNotFoundException e) { System.err.println ("Cannot connect to database server (ClassNotFoundException)"); System.out.println(e.getMessage()); } catch (InstantiationException e) { System.err.println ("Cannot connect to database server (InstantiationException)"); System.out.println(e.getMessage()); } catch (IllegalAccessException e) { System.err.println ("Cannot connect to database server (IllegalAccesException)"); 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 MySQLResult(); } }
After you click the green arrow or the Run menu and Run menu option to compile and run the program, you should see the following output. That is if you’re using my
create_mysql_store_ri2.sqlandseed_mysql_store_ri2.sqlfiles.Database connection established I Remember Mama, NR Tora! Tora! Tora!, G A Man for All Seasons, G Around the World in 80 Days, G Camelot, G Christmas Carol, G I Remember Mama, G The Hunt for Red October, PG Star Wars I, PG Star Wars II, PG Star Wars II, PG The Chronicles of Narnia, PG Beau Geste, PG Hook, PG Harry Potter and the Sorcerer's Stone, PG Scrooge, PG Harry Potter and the Sorcer's Stone, PG Harry Potter and the Sorcer's Stone, PG Harry Potter and the Chamber of Secrets, PG Harry Potter and the Chamber of Secrets, PG Harry Potter and the Prisoner of Azkaban, PG Harry Potter and the Prisoner of Azkaban, PG Harry Potter and the Half Blood Prince, PG Star Wars III, PG-13 Casino Royale, PG-13 Casino Royale, PG-13 Die Another Day, PG-13 Die Another Day, PG-13 Die Another Day, PG-13 Golden Eye, PG-13 Golden Eye, PG-13 Tomorrow Never Dies, PG-13 Tomorrow Never Dies, PG-13 The World Is Not Enough, PG-13 Clear and Present Danger, PG-13 Clear and Present Danger, PG-13 Harry Potter and the Goblet of Fire, PG-13 Harry Potter and the Goblet of Fire, PG-13 Harry Potter and the Goblet of Fire, PG-13 Harry Potter and the Order of the Phoenix, PG-13 Harry Potter and the Deathly Hallows, Part 1, PG-13 Harry Potter and the Deathly Hallows, Part 2, PG-13 Brave Heart, R The Chronicles of Narnia, E MarioKart, E Need for Speed, E Cars, E RoboCop, M Pirates of the Caribbean, T Splinter Cell, T The DaVinci Code, T Database connection terminated
As always, I hope the note helps those trying to work with the Eclipse product.
Subscribe via RSS