MacLochlainns Weblog

errors () 
{ 
  label="File Name:Line Number:Error Code";
  list=`ls ./*.$1 | wc -l`;
  if [[ ${list} -eq 1 ]]; then
    echo ${label};
    echo "----------------------------------------";
    filename=`ls *.txt`;
    echo ${filename}:`find . -type f | grep -in *.txt -e ora\- -e pls\- -e sp2\-`;
  else
    if [[ ${list} -gt 1 ]]; then
      echo ${label};
      echo "----------------------------------------";
      find . -type f | grep --color=auto -in *.txt -e ora\- -e pls\- -e sp2\-;
    fi;
  fi
}

# A local function for verbose reporting.
function Get-Message ($param, $value = $null) {
  if (!($value)) {
    Write-Host "Evaluate swtich    [" $param "]" } 	  
  else {
    Write-Host "Evaluate parameter [" $param "] and [" $value "]" } 
}
 
# Read SQLStatement file and minimally parse it.
function Get-SQLStatement ($sqlStatement) {
  # Set localvariable for return string value.
  $statement = ""
 
  # Read a file line-by-line.
  foreach ($line in Get-Content $sqlStatement) {
    # Use regular expression to replace multiple whitespace.
    $line = $line -replace '\s+', ' '
 
    # Add a whitespace to avoid joining keywords from different lines;
    # and remove trailing semicolons which are unneeded.
    if (!($line.endswith(";"))) {
      $statement += $line + " " }
    else {
      $statement += $line.trimend(";") }
  }
  # Returned minimally parsed statement.
  return $statement
}
 
# Set default type of SQL statement value to a query.
$stmt = "select"
 
# Set a variable to hold a SQL statement from a file.
$query = ""
 
# Set default values for SQL input and output files.
$outFile = "output.csv"
$sqlFile = "query.sql"
 
# Set default path to: %USERPROFILE%\AppData\Local\Temp folder, but ir 
# the tilde (~) in lieu of the %USERPROFILE% environment variable value.
$path = "~\AppData\Local\Temp"
 
# Set a verbose switch.
$verbose = $false
 
# Wrap the Parameter call to avoid a type casting warning.
try {
  param (
    [Parameter(Mandatory)][hashtable]$args
  )
}
catch {}
 
# Check for switches and parameters with arguments.
for ($i = 0; $i -lt $args.count; $i += 1) {
  if (($args[$i].startswith("-")) -and ($args[$i + 1].startswith("-"))) {
    if ($args[$i] = "-v") {
      $verbose = $true }
      # Print to verbose console.
    if ($verbose) { Get-Message $args[$i] }}
  elseif ($args[$i].startswith("-")) {
    # Print to verbose console.
    if ($verbose) { Get-Message $args[$i] $args[$i + 1] }
 
    # Evaluate and take action on parameters and values.
    if ($args[$i] -eq "-o") {
      $outfile = $args[$i + 1] }
    elseif ($args[$i] -eq "-q") {
      $sqlFile = $args[$i + 1] }
    elseif ($args[$i] -eq "-p") {
      $path = $args[$i + 1] }
  }
}
 
# Set a PowerShell Virtual Drive.
New-PSDrive -Name folder -PSProvider FileSystem -Description 'Forder Location' `
            -Root $path | Out-Null
 
# Remove the file only when it exists.
if (Test-Path folder:$outFile) {
  Remove-Item -Path folder:$outFile }
 
# Read SQL file into minimally parsed string.
if (Test-Path folder:$sqlFile) {
  $query = Get-SQLStatement $sqlFile }
 
# Set a ODBC DSN connection string.
$ConnectionString = 'DSN=OracleGeneric'
 
# Set an Oracle Command Object for a query.
$Connection = New-Object System.Data.Odbc.OdbcConnection;
$Connection.ConnectionString = $ConnectionString
 
# Attempt connection.
try {
  $Connection.Open()
 
  # Create a SQL command.
  $Command = $Connection.CreateCommand();
  $Command.CommandText = $query;
 
  # Attempt to read SQL command.
  try {
    $row = $Command.ExecuteReader();
 
    # Read while records are found.
    while ($row.Read()) {
      # Initialize output for each row.
      $output = ""
 
      # Navigate across all columns (only two in this example).
      for ($column = 0; $column -lt $row.FieldCount; $column += 1) {
        # Mechanic for comma-delimit between last and first name.  
        if ($output.length -eq 0) { 
          $output += $row[$column] }
        else {
          $output += ", " + $row[$column] }
      }
      # Write the output from the database to a file.
      Add-Content -Value $output -Path folder:$outFile
    }
  } catch {
    Write-Error "Message: $($_.Exception.Message)"
    Write-Error "StackTrace: $($_.Exception.StackTrace)"
    Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
  } finally {
    # Close the reader.
    $row.Close() }
} catch {
  Write-Error "Message: $($_.Exception.Message)"
  Write-Error "StackTrace: $($_.Exception.StackTrace)"
  Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
} finally {
  $Connection.Close() }

powershell ./OracleContact.ps1 -v -o output.csv -q script.sql -p .

Evaluate swtich    [ -v ]
Evaluate parameter [ -o ] and [ output.csv ]
Evaluate parameter [ -q ] and [ script.sql ]
Evaluate parameter [ -p ] and [ . ]

-- Drop table one.
DROP TABLE one;
 
-- Crete table one.
CREATE TABLE one
( one_id    NUMBER
, one_text  VARCHAR2(10));
 
-- Drop sequence one_s.
DROP SEQUENCE one_s;
 
-- Create sequence one_s.
CREATE SEQUENCE one_s;

@unconditional.sql

DROP TABLE one
           *
ERROR at line 1:
ORA-00942: table or view does not exist
 
Table created.
 
DROP SEQUENCE one_s
              *
ERROR at line 1:
ORA-02289: sequence does not exist
 
Sequence created.

-- Conditionally drop a table and sequence.
BEGIN
  FOR i IN (SELECT   object_name
            ,        object_type
            FROM     user_objects
            WHERE    object_name IN ('ONE','ONE_S')
            ORDER BY object_type ) LOOP
    IF i.object_type = 'TABLE' THEN
      EXECUTE IMMEDIATE 'DROP TABLE '||i.object_name||' CASCADE CONSTRAINTS';
    ELSE
      EXECUTE IMMEDIATE 'DROP SEQUENCE '||i.object_name;
    END IF;
  END LOOP;
END;
/
 
-- Crete table one.
CREATE TABLE one
( one_id    NUMBER
, one_text  VARCHAR2(10));
 
-- Create sequence one_s.
CREATE SEQUENCE one_s;

PL/SQL procedure successfully completed.
 
Table created.
 
Sequence created.

powershell .\MySQLODBC.ps1 > output.csv

param (
  [Parameter(Mandatory)][string]$fileName
)

New-PSDrive -Name test -PSProvider FileSystem -Description 'Test area' `
            -Root C:\Data\cit225\mysql\test

Name           Used (GB)     Free (GB) Provider      Root                                                                                 CurrentLocation
----           ---------     --------- --------      ----                                                                                 ---------------
test                0.00         28.74 FileSystem    C:\Data\cit225\mysql\test

New-PSDrive -Name test -PSProvider FileSystem -Description 'Test area' `
            -Root C:\Data\cit225\mysql\test | Out-Null

if (Test-Path test:$fileName) {
  Remove-Item -Path test:$fileName }

Add-Content -Value $output -Path test:$fileName

powershell MySQLContact.ps1 output.csv

# Define parameter list for mandatory file name.
param (
  [Parameter(Mandatory)][string]$fileName
)
 
# Define a PowerShell Virtual Drive.
New-PSDrive -Name test -PSProvider FileSystem -Description 'Test area' `
            -Root C:\Data\cit225\mysql\test | Out-Null
 
# Remove the file only when it exists.
if (Test-Path test:$fileName) {
  Remove-Item -Path test:$fileName }
 
# Define a ODBC DSN connection string.
$ConnectionString = 'DSN=MySQLODBC2'
 
# Define a MySQL Command Object for a non-query.
$Connection = New-Object System.Data.Odbc.OdbcConnection;
$Connection.ConnectionString = $ConnectionString
 
# Attempt connection.
try {
  $Connection.Open()
 
  # Create a SQL command.
  $Command = $Connection.CreateCommand();
  $Command.CommandText = "SELECT last_name " + 
                         ",      first_name " +
                         "FROM   contact " +
                         "ORDER BY 1, 2";
 
  # Attempt to read SQL command.
  try {
    $row = $Command.ExecuteReader();
 
    # Read while records are found.
    while ($row.Read()) {
      # Initialize output for each row.
      $output = ""
 
      # Navigate across all columns (only two in this example).
      for ($column = 0; $column -lt $row.FieldCount; $column += 1) {
        # Mechanic for comma-delimit between last and first name.  
        if ($output.length -eq 0) { 
          $output += $row[$column] }
        else {
          $output += ", " + $row[$column] }
      }
        # Write the output from the database to a file.
        Add-Content -Value $output -Path test:$fileName
    }
 
  } catch {
    Write-Error "Message: $($_.Exception.Message)"
    Write-Error "StackTrace: $($_.Exception.StackTrace)"
    Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
  } finally {
    # Close the reader.
    $row.Close() }
 
} catch {
  Write-Error "Message: $($_.Exception.Message)"
  Write-Error "StackTrace: $($_.Exception.StackTrace)"
  Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
} finally {
  $Connection.Close() }

$ConnectionString = 'DSN=MySQLODBC;Uid=student;Pwd=student'

$ConnectionString = 'DSN=MySQLODBC'

# Define a ODBC DSN connection string.
$ConnectionString = 'DSN=MySQLODBC'
 
# Define a MySQL Command Object for a non-query.
$Connection = New-Object System.Data.Odbc.OdbcConnection;
$Connection.ConnectionString = $ConnectionString
 
# Attempt connection.
try {
  $Connection.Open()
 
  # Create a SQL command.
  $Command = $Connection.CreateCommand();
  $Command.CommandText = "SELECT database();";
 
  # Attempt to read SQL command.
  try {
    $Reader = $Command.ExecuteReader();
 
    # Read while records are found.
    while ($Reader.Read()) {
      Write-Host "Current Database [" $Reader[0] "]"}
 
  } catch {
    Write-Host "Message: $($_.Exception.Message)"
    Write-Host "StackTrace: $($_.Exception.StackTrace)"
    Write-Host "LoaderExceptions: $($_.Exception.LoaderExceptions)"
  } finally {
    # Close the reader.
    $Reader.Close() }
 
} catch {
  Write-Host "Message: $($_.Exception.Message)"
  Write-Host "StackTrace: $($_.Exception.StackTrace)"
  Write-Host "LoaderExceptions: $($_.Exception.LoaderExceptions)"
} finally {
  $Connection.Close() }

powershell .\MySQLCursor.ps1

Current Database [ studentdb ]

# Define a ODBC DSN connection string.
$ConnectionString = 'DSN=MySQLODBC'
 
# Define a MySQL Command Object for a non-query.
$Connection = New-Object System.Data.Odbc.OdbcConnection;
$Connection.ConnectionString = $ConnectionString
 
# Attempt connection.
try {
  $Connection.Open()
 
  # Create a SQL command.
  $Command = $Connection.CreateCommand();
  $Command.CommandText = "SELECT last_name, first_name FROM contact ORDER BY 1, 2";
 
  # Attempt to read SQL command.
  try {
    $row = $Command.ExecuteReader();
 
    # Read while records are found.
    while ($row.Read()) {
      # Initialize output for each row.
      $output = ""
 
      # Navigate across all columns (only two in this example).
      for ($column = 0; $column -lt $row.FieldCount; $column += 1) {
        # Mechanic for comma-delimit between last and first name.  
        if ($output.length -eq 0) { 
          $output += $row[$column] }
        else {
          $output += ", " + $row[$column] }
        }
        # Write the output from the database.
        Write-Host $output
      }
 
  } catch {
    Write-Host "Message: $($_.Exception.Message)"
    Write-Host "StackTrace: $($_.Exception.StackTrace)"
    Write-Host "LoaderExceptions: $($_.Exception.LoaderExceptions)"
  } finally {
    # Close the reader.
    $row.Close() }
 
} catch {
  Write-Host "Message: $($_.Exception.Message)"
  Write-Host "StackTrace: $($_.Exception.StackTrace)"
  Write-Host "LoaderExceptions: $($_.Exception.LoaderExceptions)"
} finally {
  $Connection.Close() }

powershell .\MySQLContact.ps1

Clinton, Goeffrey
Gretelz, Simon
Moss, Wendy
Potter, Ginny
Potter, Harry
Potter, Lily
Royal, Elizabeth
Smith, Brian
Sweeney, Ian
Sweeney, Matthew
Sweeney, Meaghan
Vizquel, Doreen
Vizquel, Oscar
Winn, Brian
Winn, Randi

$ConnectionString = 'DSN=PostgreSQL35W;Uid=student;Pwd=student'

$ConnectionString = 'DSN=PostgreSQL35W'

# Define a ODBC DSN connection string.
$ConnectionString = 'DSN=PostgreSQL35W'
 
# Define a MySQL Command Object for a non-query.
$Connection = New-Object System.Data.Odbc.OdbcConnection;
$Connection.ConnectionString = $ConnectionString
 
# Attempt connection.
try {
  $Connection.Open()
 
  # Create a SQL command.
  $Command = $Connection.CreateCommand();
  $Command.CommandText = "SELECT current_database();";
 
  # Attempt to read SQL command.
  try {
    $Reader = $Command.ExecuteReader();
 
    # Read while records are found.
    while ($Reader.Read()) {
      Write-Host "Current Database [" $Reader[0] "]"}
 
  } catch {
    Write-Error "Message: $($_.Exception.Message)"
    Write-Error "StackTrace: $($_.Exception.StackTrace)"
    Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
  } finally {
    # Close the reader.
    $Reader.Close() }
 
} catch {
  Write-Error "Message: $($_.Exception.Message)"
  Write-Error "StackTrace: $($_.Exception.StackTrace)"
  Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
} finally {
  $Connection.Close() }

powershell .\readcursor.ps1

Current Database [ videodb ]

# Define a ODBC DSN connection string.
$ConnectionString = 'DSN=PostgreSQL35W'
 
# Define a MySQL Command Object for a non-query.
$Connection = New-Object System.Data.Odbc.OdbcConnection;
$Connection.ConnectionString = $ConnectionString
 
# Attempt connection.
try {
  $Connection.Open()
 
  # Create a SQL command.
  $Command = $Connection.CreateCommand();
  $Command.CommandText = "SELECT last_name, first_name FROM contact ORDER BY 1, 2";
 
  # Attempt to read SQL command.
  try {
    $row = $Command.ExecuteReader();
 
    # Read while records are found.
    while ($row.Read()) {
      # Initialize output for each row.
      $output = ""
 
      # Navigate across all columns (only two in this example).
      for ($column = 0; $column -lt $row.FieldCount; $column += 1) {
        # Mechanic for comma-delimit between last and first name.  
        if ($output.length -eq 0) { 
          $output += $row[$column] }
        else {
          $output += ", " + $row[$column] }
        }
        # Write the output from the database.
        Write-Host $output
      }
 
  } catch {
    Write-Error "Message: $($_.Exception.Message)"
    Write-Error "StackTrace: $($_.Exception.StackTrace)"
    Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
  } finally {
    # Close the reader.
    $row.Close() }
 
} catch {
  Write-Error "Message: $($_.Exception.Message)"
  Write-Error "StackTrace: $($_.Exception.StackTrace)"
  Write-Error "LoaderExceptions: $($_.Exception.LoaderExceptions)"
} finally {
  $Connection.Close() }

powershell .\readcontact.ps1

Clinton, Goeffrey
Gretelz, Simon
Moss, Wendy
Royal, Elizabeth
Smith, Brian
Sweeney, Ian
Sweeney, Matthew
Sweeney, Meaghan
Vizquel, Doreen
Vizquel, Oscar
Winn, Brian
Winn, Randi

import psycopg2

Traceback (most recent call last):
  File "python_new_hire.sql", line 1, in <module>
    import psycopg2
ModuleNotFoundError: No module named 'psycopg2'

yum install python3-psycopg2

====================================================================================
 Package                  Architecture   Version               Repository      Size
====================================================================================
Installing:
 python3-psycopg2         x86_64         2.7.7-1.fc30          fedora         160 k
 
Transaction Summary
====================================================================================
Install  1 Package
 
Total download size: 160 k
Installed size: 593 k
Is this ok [y/N]: y
Downloading Packages:
python3-psycopg2-2.7.7-1.fc30.x86_64.rpm            364 kB/s | 160 kB     00:00    
------------------------------------------------------------------------------------
Total                                               167 kB/s | 160 kB     00:00     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                            1/1 
  Installing       : python3-psycopg2-2.7.7-1.fc30.x86_64                       1/1 
  Running scriptlet: python3-psycopg2-2.7.7-1.fc30.x86_64                       1/1 
  Verifying        : python3-psycopg2-2.7.7-1.fc30.x86_64                       1/1 
 
Installed:
  python3-psycopg2-2.7.7-1.fc30.x86_64                                              
 
Complete!

-- Environment settings for the script.
SET SESSION "videodb.table_name" = 'new_hire';
SET CLIENT_MIN_MESSAGES TO ERROR;
 
--  Verify table name.
SELECT current_setting('videodb.table_name');
 
-- ------------------------------------------------------------------
--  Conditionally drop table.
-- ------------------------------------------------------------------
DROP TABLE IF EXISTS new_hire CASCADE;
 
-- ------------------------------------------------------------------
--  Create table.
-- -------------------------------------------------------------------
CREATE TABLE new_hire
( new_hire_id  SERIAL
, first_name   VARCHAR(20)  NOT NULL
, middle_name  VARCHAR(20)
, last_name    VARCHAR(20)  NOT NULL
, hire_date    TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP
, PRIMARY KEY (new_hire_id));
 
-- Alter the sequence by restarting it at 1001.
ALTER SEQUENCE new_hire_new_hire_id_seq RESTART WITH 1001;
 
-- Display the table organization.
SELECT   tc.table_catalog || '.' || tc.constraint_name AS constraint_name
,        tc.table_catalog || '.' || tc.table_name AS table_name
,        kcu.column_name
,        ccu.table_catalog || '.' || ccu.table_name AS foreign_table_name
,        ccu.column_name AS foreign_column_name
FROM     information_schema.table_constraints AS tc JOIN information_schema.key_column_usage AS kcu
ON       tc.constraint_name = kcu.constraint_name
AND      tc.table_schema = kcu.table_schema JOIN information_schema.constraint_column_usage AS ccu
ON       ccu.constraint_name = tc.constraint_name
AND      ccu.table_schema = tc.table_schema
WHERE    tc.constraint_type = 'FOREIGN KEY'
AND      tc.table_name = current_setting('videodb.table_name')
ORDER BY 1;
 
SELECT c1.table_name
,      c1.ordinal_position
,      c1.column_name
,      CASE
         WHEN c1.is_nullable = 'NO' AND c2.column_name IS NOT NULL THEN 'PRIMARY KEY'
         WHEN c1.is_nullable = 'NO' AND c2.column_name IS NULL THEN 'NOT NULL'
       END AS is_nullable
,      CASE
         WHEN data_type = 'character varying' THEN
           data_type||'('||character_maximum_length||')'
         WHEN data_type = 'numeric' THEN
           CASE
             WHEN numeric_scale != 0 AND numeric_scale IS NOT NULL THEN
               data_type||'('||numeric_precision||','||numeric_scale||')'
             ELSE
               data_type||'('||numeric_precision||')'
             END
         ELSE
           data_type
        END AS data_type
FROM    information_schema.columns c1 LEFT JOIN
          (SELECT trim(regexp_matches(column_default,current_setting('videodb.table_name'))::text,'{}')||'_id' column_name
           FROM   information_schema.columns) c2
ON       c1.column_name = c2.column_name
WHERE    c1.table_name = current_setting('videodb.table_name')
ORDER BY c1.ordinal_position;
 
-- Display primary key and unique constraints.
SELECT constraint_name
,      lower(constraint_type) AS constraint_type
FROM   information_schema.table_constraints
WHERE  table_name = current_setting('videodb.table_name')
AND    constraint_type IN ('PRIMARY KEY','UNIQUE');
 
-- Insert two test records.
INSERT INTO new_hire
( first_name, middle_name, last_name, hire_date )
VALUES
 ('Malcolm','Jacob','Lewis','2018-2-14')
,('Henry',null,'Chabot','1990-07-31');

\i new_hire.sql

# Import the PostgreSQL connector library.
import psycopg2
 
try:
  # Open a connection to the database.
  connection = psycopg2.connect( user="student"
                               , password="student"
                               , port="5432"
                               , dbname="videodb")
 
  # Open a cursor.
  cursor = connection.cursor()
 
  # Assign a static query.
  query = "SELECT new_hire_id, first_name, last_name " \
          "FROM new_hire"
 
  # Parse and execute the query.
  cursor.execute(query)
 
  # Fetch all rows from a table.
  records = cursor.fetchall()
 
  # Read through and print the rows as tuples.
  for row in range(0, len(records)):
    print(records[row]) 
 
except (Exception, psycopg2.Error) as error :
  print("Error while fetching data from PostgreSQL", error)
 
finally:
  # Close the database connection.
  if (connection):
    cursor.close()
    connection.close()

python3 ./new_hire.py

(1001, 'Malcolm', 'Lewis')
(1002, 'Henry', 'Chabot')

SELECT   f.title AS film
,        fp.title AS prequel
FROM     film f LEFT JOIN film fp
ON       f.prequel_id = fp.film_id
WHERE    f.series_name = 'Harry Potter'
ORDER BY f.series_number;

+----------------------------------------------+----------------------------------------------+
| film                                         | prequel                                      |
+----------------------------------------------+----------------------------------------------+
| Harry Potter and the Chamber of Secrets      | Harry Potter and the Sorcerer's Stone        |
| Harry Potter and the Prisoner of Azkaban     | Harry Potter and the Chamber of Secrets      |
| Harry Potter and the Goblet of Fire          | Harry Potter and the Prisoner of Azkaban     |
| Harry Potter and the Order of the Phoenix    | Harry Potter and the Goblet of Fire          |
| Harry Potter and the Half Blood Prince       | Harry Potter and the Order of the Phoenix    |
| Harry Potter and the Deathly Hallows: Part 1 | Harry Potter and the Half Blood Prince       |
| Harry Potter and the Deathly Hallows: Part 2 | Harry Potter and the Deathly Hallows: Part 1 |
+----------------------------------------------+----------------------------------------------+
7 rows in set (0.00 sec)

SELECT   f.title AS film
,        IFNULL(
           CASE
             WHEN NOT f.film_id = fp.film_id
             AND      f.prequel_id = fp.film_id THEN fp.title		   
           END,'None') AS prequel
FROM     film f LEFT JOIN film fp
ON       f.prequel_id = fp.film_id
WHERE    f.series_name = 'Harry Potter'
ORDER BY f.series_number;

+----------------------------------------------+----------------------------------------------+
| film                                         | prequel                                   |
+----------------------------------------------+----------------------------------------------+
| Harry Potter and the Sorcerer's Stone        | NULL                                         |
+----------------------------------------------+----------------------------------------------+

+----------------------------------------------+----------------------------------------------+
| film                                         | prequel                                      |
+----------------------------------------------+----------------------------------------------+
| Harry Potter and the Sorcerer's Stone        | None                                         |
| Harry Potter and the Chamber of Secrets      | Harry Potter and the Sorcerer's Stone        |
| Harry Potter and the Prisoner of Azkaban     | Harry Potter and the Chamber of Secrets      |
| Harry Potter and the Goblet of Fire          | Harry Potter and the Prisoner of Azkaban     |
| Harry Potter and the Order of the Phoenix    | Harry Potter and the Goblet of Fire          |
| Harry Potter and the Half Blood Prince       | Harry Potter and the Order of the Phoenix    |
| Harry Potter and the Deathly Hallows: Part 1 | Harry Potter and the Half Blood Prince       |
| Harry Potter and the Deathly Hallows: Part 2 | Harry Potter and the Deathly Hallows: Part 1 |
+----------------------------------------------+----------------------------------------------+
8 rows in set (0.01 sec)

+----------------------+---------------------------------------------------------------------+------+-----+-------------------+-----------------------------------------------+
| Field                | Type                                                                | Null | Key | Default           | Extra                                         |
+----------------------+---------------------------------------------------------------------+------+-----+-------------------+-----------------------------------------------+
| film_id              | smallint unsigned                                                   | NO   | PRI | NULL              | auto_increment                                |
| title                | varchar(255)                                                        | NO   | MUL | NULL              |                                               |
| description          | text                                                                | YES  |     | NULL              |                                               |
| release_year         | year                                                                | YES  |     | NULL              |                                               |
| language_id          | tinyint unsigned                                                    | NO   | MUL | NULL              |                                               |
| original_language_id | tinyint unsigned                                                    | YES  | MUL | NULL              |                                               |
| rental_duration      | tinyint unsigned                                                    | NO   |     | 3                 |                                               |
| rental_rate          | decimal(4,2)                                                        | NO   |     | 4.99              |                                               |
| length               | smallint unsigned                                                   | YES  |     | NULL              |                                               |
| replacement_cost     | decimal(5,2)                                                        | NO   |     | 19.99             |                                               |
| rating               | enum('G','PG','PG-13','R','NC-17')                                  | YES  |     | G                 |                                               |
| special_features     | set('Trailers','Commentaries','Deleted Scenes','Behind the Scenes') | YES  |     | NULL              |                                               |
| last_update          | timestamp                                                           | NO   |     | CURRENT_TIMESTAMP | DEFAULT_GENERATED on update CURRENT_TIMESTAMP |
| series_name          | varchar(20)                                                         | YES  |     | NULL              |                                               |
| series_number        | int unsigned                                                        | YES  |     | NULL              |                                               |
| prequel              | int unsigned                                                        | YES  |     | NULL              |                                               |
+----------------------+---------------------------------------------------------------------+------+-----+-------------------+-----------------------------------------------+
16 rows in set (0.21 sec)

-- Use sakila database.
USE sakila;
 
-- Add a prequel_id column to the sakila.film table.
ALTER TABLE film
ADD (series_name    varchar(20)),
ADD (series_number  int unsigned),
ADD (prequel_id     int unsigned);
 
-- Set primary to foreign key local variable.
SET @sv_film_id = 0;
 
-- Insert Harry Potter films in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Sorcerer''s Stone'
,'A film about a young boy who on his eleventh birthday discovers, he is the orphaned boy of two powerful wizards and has unique magical powers.'
, 2001
, 1
, NULL
, 3
, 0.99
, 152
, 19.99
,'PG'
,'Trailers'
,'2001-11-04'
,'Harry Potter'
, 1
, NULL );
 
-- Assign the last generated primary key value to the local variable.
SET @sv_film_id := last_insert_id();
 
-- Insert 2nd film in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Chamber of Secrets'
,'A film where Harry returning to Hogwarts, still famous and a hero, when strange things start to happen ... people are turning to stone and no-one knows what, or who, is doing it.'
, 2002
, 1
, NULL
, 3
, 0.99
, 160
, 19.99
,'PG'
,'Trailers'
,'2002-11-15'
,'Harry Potter'
, 2
, @sv_film_id );
 
-- Assign the last generated primary key value to the local variable.
SET @sv_film_id := last_insert_id();
 
-- Insert 3rd film in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Prisoner of Azkaban'
,'A film where Harry, Ron, and Hermione return for their third year at Hogwarts and are forced to face escaped prisoner, Sirius Black.'
, 2004
, 1
, NULL
, 3
, 0.99
, 141
, 19.99
,'PG'
,'Trailers'
,'2004-06-04'
,'Harry Potter'
, 3
, @sv_film_id );
 
-- Assign the last generated primary key value to the local variable.
SET @sv_film_id := last_insert_id();
 
-- Insert 4th film in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Goblet of Fire'
,'A film where where Harry Potter''s name emerges from the Goblet of Fire, and he becomes a competitor in a grueling battle for glory among three wizarding schools - the Triwizard Tournament.'
, 2005
, 1
, NULL
, 3
, 0.99
, 157
, 19.99
,'PG'
,'Trailers'
,'2005-11-18'
,'Harry Potter'
, 4
, @sv_film_id );
 
-- Assign the last generated primary key value to the local variable.
SET @sv_film_id := last_insert_id();
 
-- Insert 5th film in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Order of the Phoenix'
,'A film where Lord Voldemort has returned, but the Ministry of Magic is doing everything it can to keep the wizarding world from knowing the truth.'
, 2007
, 1
, NULL
, 3
, 0.99
, 138
, 19.99
,'PG-13'
,'Trailers'
,'2007-07-12'
,'Harry Potter'
, 5
, @sv_film_id );
 
-- Assign the last generated primary key value to the local variable.
SET @sv_film_id := last_insert_id();
 
-- Insert 6th film in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Half Blood Prince'
,'A film where Voldemort is tightening his grip on Hogwarts and it is no longer the safe haven it once was. Harry and Dumbledore work to find the key to unlock the Dark Lord''s defenses.'
, 2009
, 1
, NULL
, 3
, 0.99
, 153
, 19.99
,'PG'
,'Trailers'
,'2009-07-15'
,'Harry Potter'
, 6
, @sv_film_id );
 
-- Assign the last generated primary key value to the local variable.
SET @sv_film_id := last_insert_id();
 
-- Insert 7th film in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Deathly Hallows: Part 1'
,'A film where Harry, Ron and Hermione set out on their perilous mission to track down and destroy the Horcruxes - the keys to Voldemort''s immortality.'
, 2010
, 1
, NULL
, 3
, 0.99
, 146
, 19.99
,'PG-13'
,'Trailers'
,'2010-11-19'
,'Harry Potter'
, 7
, @sv_film_id );
 
-- Assign the last generated primary key value to the local variable.
SET @sv_film_id := last_insert_id();
 
-- Insert 8th film in sakila.film table with classic values clause.
INSERT INTO film
( title
, description
, release_year
, language_id
, original_language_id
, rental_duration
, rental_rate
, length
, replacement_cost
, rating
, special_features
, last_update
, series_name
, series_number
, prequel_id )
VALUES
('Harry Potter and the Deathly Hallows: Part 2'
,'A film where Harry, Ron and Hermione set out on their perilous mission to track down and destroy the Horcruxes - the keys to Voldemort''s immortality.'
, 2011
, 1
, NULL
, 3
, 0.99
, 130
, 19.99
,'PG-13'
,'Trailers'
,'2011-07-15'
,'Harry Potter'
, 8
, @sv_film_id );

DELETE FROM film WHERE film_id > 1000;
ALTER TABLE film DROP COLUMN series_name;
ALTER TABLE film DROP COLUMN series_number;
ALTER TABLE film DROP COLUMN prequel_id;
ALTER TABLE film AUTO_INCREMENT = 1000;