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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Schema\ChangeItem;
defined('JPATH_PLATFORM') or die;
use Joomla\CMS\Schema\ChangeItem;
/**
* Checks the database schema against one PostgreSQL DDL query to see if it has been run.
*
* @since 3.0
*/
class PostgresqlChangeItem extends ChangeItem
{
/**
* Checks a DDL query to see if it is a known type
* If yes, build a check query to see if the DDL has been run on the database.
* If successful, the $msgElements, $queryType, $checkStatus and $checkQuery fields are populated.
* The $msgElements contains the text to create the user message.
* The $checkQuery contains the SQL query to check whether the schema change has
* been run against the current database. The $queryType contains the type of
* DDL query that was run (for example, CREATE_TABLE, ADD_COLUMN, CHANGE_COLUMN_TYPE, ADD_INDEX).
* The $checkStatus field is set to zero if the query is created
*
* If not successful, $checkQuery is empty and , and $checkStatus is -1.
* For example, this will happen if the current line is a non-DDL statement.
*
* @return void
*
* @since 3.0
*/
protected function buildCheckQuery()
{
// Initialize fields in case we can't create a check query
$this->checkStatus = -1; // change status to skipped
$result = null;
$splitIntoWords = "~'[^']*'(*SKIP)(*F)|\s+~";
$splitIntoActions = "~'[^']*'(*SKIP)(*F)|\([^)]*\)(*SKIP)(*F)|,~";
// Remove any newlines
$this->updateQuery = str_replace("\n", '', $this->updateQuery);
// Remove trailing whitespace and semicolon
$this->updateQuery = rtrim($this->updateQuery, "; \t\n\r\0\x0B");
// Fix up extra spaces around () and in general
$find = array('#((\s*)\(\s*([^)\s]+)\s*)(\))#', '#(\s)(\s*)#');
$replace = array('($3)', '$1');
$updateQuery = preg_replace($find, $replace, $this->updateQuery);
$wordArray = preg_split($splitIntoWords, $updateQuery, -1, PREG_SPLIT_NO_EMPTY);
$totalWords = count($wordArray);
// First, make sure we have an array of at least 6 elements
// if not, we can't make a check query for this one
if ($totalWords < 6)
{
// Done with method
return;
}
// We can only make check queries for alter table and create table queries
$command = strtoupper($wordArray[0] . ' ' . $wordArray[1]);
if ($command === 'ALTER TABLE')
{
// Check only the last action
$actions = ltrim(substr($updateQuery, strpos($updateQuery, $wordArray[2]) + strlen($wordArray[2])));
$actions = preg_split($splitIntoActions, $actions);
// Get the last action
$lastActionArray = preg_split($splitIntoWords, end($actions), -1, PREG_SPLIT_NO_EMPTY);
// Replace all actions by the last one
array_splice($wordArray, 3, $totalWords, $lastActionArray);
$alterCommand = strtoupper($wordArray[3] . ' ' . $wordArray[4]);
if ($alterCommand === 'ADD COLUMN')
{
$result = 'SELECT column_name'
. ' FROM information_schema.columns'
. ' WHERE table_name='
. $this->fixQuote($wordArray[2])
. ' AND column_name=' . $this->fixQuote($wordArray[5]);
$this->queryType = 'ADD_COLUMN';
$this->msgElements = array(
$this->fixQuote($wordArray[2]),
$this->fixQuote($wordArray[5])
);
}
elseif ($alterCommand === 'DROP COLUMN')
{
$result = 'SELECT column_name'
. ' FROM information_schema.columns'
. ' WHERE table_name='
. $this->fixQuote($wordArray[2])
. ' AND column_name=' . $this->fixQuote($wordArray[5]);
$this->queryType = 'DROP_COLUMN';
$this->checkQueryExpected = 0;
$this->msgElements = array(
$this->fixQuote($wordArray[2]),
$this->fixQuote($wordArray[5])
);
}
elseif ($alterCommand === 'ALTER COLUMN')
{
$alterAction = strtoupper($wordArray[6]);
if ($alterAction === 'TYPE')
{
$type = implode(' ', array_slice($wordArray, 7));
if ($pos = stripos($type, ' USING '))
{
$type = substr($type, 0, $pos);
}
if ($pos = strpos($type, '('))
{
$datatype = substr($type, 0, $pos);
}
else
{
$datatype = $type;
}
$result = 'SELECT column_name, data_type '
. 'FROM information_schema.columns WHERE table_name='
. $this->fixQuote($wordArray[2]) . ' AND column_name='
. $this->fixQuote($wordArray[5])
. ' AND data_type=' . $this->fixQuote($datatype);
if ($datatype === 'character varying')
{
$result .= ' AND character_maximum_length = ' . (int) substr($type, $pos + 1);
}
$this->queryType = 'CHANGE_COLUMN_TYPE';
$this->msgElements = array(
$this->fixQuote($wordArray[2]),
$this->fixQuote($wordArray[5]),
$type
);
}
elseif ($alterAction === 'SET')
{
$alterType = strtoupper($wordArray[7]);
if ($alterType === 'NOT' && strtoupper($wordArray[8]) === 'NULL')
{
$result = 'SELECT column_name, data_type, is_nullable'
. ' FROM information_schema.columns'
. ' WHERE table_name=' . $this->fixQuote($wordArray[2])
. ' AND column_name=' . $this->fixQuote($wordArray[5])
. ' AND is_nullable=' . $this->fixQuote('NO');
$this->queryType = 'CHANGE_COLUMN_TYPE';
$this->msgElements = array(
$this->fixQuote($wordArray[2]),
$this->fixQuote($wordArray[5]),
'NOT NULL'
);
}
elseif ($alterType === 'DEFAULT')
{
$result = 'SELECT column_name, data_type, is_nullable'
. ' FROM information_schema.columns'
. ' WHERE table_name=' . $this->fixQuote($wordArray[2])
. ' AND column_name=' . $this->fixQuote($wordArray[5])
. ' AND (CASE (position(' . $this->db->quote('::') . ' in column_default))'
. ' WHEN 0 THEN '
. ' column_default = ' . $this->db->quote($wordArray[8])
. ' ELSE '
. ' substring(column_default, 1, (position(' . $this->db->quote('::')
. ' in column_default) -1)) = ' . $this->db->quote($wordArray[8])
. ' END)';
$this->queryType = 'CHANGE_COLUMN_TYPE';
$this->msgElements = array(
$this->fixQuote($wordArray[2]),
$this->fixQuote($wordArray[5]),
'DEFAULT ' . $wordArray[8]
);
}
}
elseif ($alterAction === 'DROP')
{
$alterType = strtoupper($wordArray[7]);
if ($alterType === 'DEFAULT')
{
$result = 'SELECT column_name, data_type, is_nullable , column_default'
. ' FROM information_schema.columns'
. ' WHERE table_name=' . $this->fixQuote($wordArray[2])
. ' AND column_name=' . $this->fixQuote($wordArray[5])
. ' AND column_default IS NOT NULL';
$this->queryType = 'CHANGE_COLUMN_TYPE';
$this->checkQueryExpected = 0;
$this->msgElements = array(
$this->fixQuote($wordArray[2]),
$this->fixQuote($wordArray[5]),
'NOT DEFAULT'
);
}
elseif ($alterType === 'NOT' && strtoupper($wordArray[8]) === 'NULL')
{
$result = 'SELECT column_name, data_type, is_nullable , column_default'
. ' FROM information_schema.columns'
. ' WHERE table_name=' . $this->fixQuote($wordArray[2])
. ' AND column_name=' . $this->fixQuote($wordArray[5])
. ' AND is_nullable = ' . $this->fixQuote('NO');
$this->queryType = 'CHANGE_COLUMN_TYPE';
$this->checkQueryExpected = 0;
$this->msgElements = array(
$this->fixQuote($wordArray[2]),
$this->fixQuote($wordArray[5]),
'NULL'
);
}
}
}
}
elseif ($command === 'DROP INDEX')
{
if (strtoupper($wordArray[2] . $wordArray[3]) === 'IFEXISTS')
{
$idx = $this->fixQuote($wordArray[4]);
}
else
{
$idx = $this->fixQuote($wordArray[2]);
}
$result = 'SELECT * FROM pg_indexes WHERE indexname=' . $idx;
$this->queryType = 'DROP_INDEX';
$this->checkQueryExpected = 0;
$this->msgElements = array($this->fixQuote($idx));
}
elseif ($command === 'CREATE INDEX' || (strtoupper($command . $wordArray[2]) === 'CREATE UNIQUE INDEX'))
{
if ($wordArray[1] === 'UNIQUE')
{
$idx = $this->fixQuote($wordArray[3]);
$table = $this->fixQuote($wordArray[5]);
}
else
{
$idx = $this->fixQuote($wordArray[2]);
$table = $this->fixQuote($wordArray[4]);
}
$result = 'SELECT * FROM pg_indexes WHERE indexname=' . $idx . ' AND tablename=' . $table;
$this->queryType = 'ADD_INDEX';
$this->checkQueryExpected = 1;
$this->msgElements = array($table, $idx);
}
if ($command === 'CREATE TABLE')
{
if (strtoupper($wordArray[2] . $wordArray[3] . $wordArray[4]) === 'IFNOTEXISTS')
{
$table = $this->fixQuote($wordArray[5]);
}
else
{
$table = $this->fixQuote($wordArray[2]);
}
$result = 'SELECT table_name FROM information_schema.tables WHERE table_name=' . $table;
$this->queryType = 'CREATE_TABLE';
$this->checkQueryExpected = 1;
$this->msgElements = array($table);
}
// Set fields based on results
if ($this->checkQuery = $result)
{
// Unchecked status
$this->checkStatus = 0;
}
else
{
// Skipped
$this->checkStatus = -1;
}
}
/**
* Fix up integer. Fixes problem with PostgreSQL integer descriptions.
* If you change a column to "integer unsigned" it shows
* as "int(10) unsigned" in the check query.
*
* @param string $type1 the column type
* @param string $type2 the column attributes
*
* @return string The original or changed column type.
*
* @since 3.0
*/
private function fixInteger($type1, $type2)
{
$result = $type1;
if (strtolower($type1) === 'integer' && strtolower(substr($type2, 0, 8)) === 'unsigned')
{
$result = 'unsigned int(10)';
}
return $result;
}
/**
* Fixes up a string for inclusion in a query.
* Replaces name quote character with normal quote for literal.
* Drops trailing semicolon. Injects the database prefix.
*
* @param string $string The input string to be cleaned up.
*
* @return string The modified string.
*
* @since 3.0
*/
private function fixQuote($string)
{
$string = str_replace('"', '', $string);
$string = str_replace(';', '', $string);
$string = str_replace('#__', $this->db->getPrefix(), $string);
return $this->db->quote($string);
}
}