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libraries/cms/schema/changeitem/sqlsrv.php
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148
libraries/cms/schema/changeitem/sqlsrv.php
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<?php
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/**
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* @package Joomla.Libraries
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* @subpackage Schema
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*
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* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE
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*/
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defined('_JEXEC') or die;
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/**
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* Checks the database schema against one SQL Server DDL query to see if it has been run.
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*
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* @package Joomla.Libraries
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* @subpackage Schema
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* @since 2.5
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*/
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class JSchemaChangeitemSqlsrv extends JSchemaChangeitem
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{
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/**
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* Checks a DDL query to see if it is a known type
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* If yes, build a check query to see if the DDL has been run on the database.
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* If successful, the $msgElements, $queryType, $checkStatus and $checkQuery fields are populated.
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* The $msgElements contains the text to create the user message.
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* The $checkQuery contains the SQL query to check whether the schema change has
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* been run against the current database. The $queryType contains the type of
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* DDL query that was run (for example, CREATE_TABLE, ADD_COLUMN, CHANGE_COLUMN_TYPE, ADD_INDEX).
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* The $checkStatus field is set to zero if the query is created
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*
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* If not successful, $checkQuery is empty and , and $checkStatus is -1.
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* For example, this will happen if the current line is a non-DDL statement.
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*
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* @return void
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*
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* @since 2.5
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*/
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protected function buildCheckQuery()
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{
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// Initialize fields in case we can't create a check query
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$this->checkStatus = -1; // change status to skipped
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$result = null;
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// Remove any newlines
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$this->updateQuery = str_replace("\n", '', $this->updateQuery);
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// Fix up extra spaces around () and in general
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$find = array('#((\s*)\(\s*([^)\s]+)\s*)(\))#', '#(\s)(\s*)#');
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$replace = array('($3)', '$1');
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$updateQuery = preg_replace($find, $replace, $this->updateQuery);
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$wordArray = explode(' ', $updateQuery);
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// First, make sure we have an array of at least 6 elements
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// if not, we can't make a check query for this one
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if (count($wordArray) < 6)
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{
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// Done with method
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return;
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}
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// We can only make check queries for alter table and create table queries
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$command = strtoupper($wordArray[0] . ' ' . $wordArray[1]);
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if ($command === 'ALTER TABLE')
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{
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$alterCommand = strtoupper($wordArray[3] . ' ' . $wordArray[4]);
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if ($alterCommand == 'ADD')
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{
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$result = 'SELECT * FROM INFORMATION_SCHEMA.Columns ' . $wordArray[2] . ' WHERE COLUMN_NAME = ' . $this->fixQuote($wordArray[5]);
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$this->queryType = 'ADD';
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$this->msgElements = array($this->fixQuote($wordArray[2]), $this->fixQuote($wordArray[5]));
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}
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elseif ($alterCommand == 'CREATE INDEX')
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{
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$index = $this->fixQuote(substr($wordArray[5], 0, strpos($wordArray[5], '(')));
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$result = 'SELECT * FROM SYS.INDEXES ' . $wordArray[2] . ' WHERE name = ' . $index;
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$this->queryType = 'CREATE INDEX';
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$this->msgElements = array($this->fixQuote($wordArray[2]), $index);
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}
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elseif (strtoupper($wordArray[3]) == 'MODIFY' || strtoupper($wordArray[3]) == 'CHANGE')
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{
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$result = 'SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = ' . $this->fixQuote($wordArray[2]);
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$this->queryType = 'ALTER COLUMN COLUMN_NAME =' . $this->fixQuote($wordArray[4]);
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$this->msgElements = array($this->fixQuote($wordArray[2]), $this->fixQuote($wordArray[4]));
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}
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}
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if ($command == 'CREATE TABLE')
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{
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$table = $wordArray[5];
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$result = 'SELECT * FROM sys.TABLES WHERE NAME = ' . $this->fixQuote($table);
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$this->queryType = 'CREATE_TABLE';
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$this->msgElements = array($this->fixQuote($table));
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}
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// Set fields based on results
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if ($this->checkQuery = $result)
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{
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// Unchecked status
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$this->checkStatus = 0;
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}
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else
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{
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// Skipped
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$this->checkStatus = -1;
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}
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}
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/**
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* Fix up integer. Fixes problem with MySQL integer descriptions.
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* If you change a column to "integer unsigned" it shows
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* as "int(10) unsigned" in the check query.
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*
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* @param string $type1 the column type
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* @param string $type2 the column attributes
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*
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* @return string The original or changed column type.
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*
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* @since 2.5
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*/
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private function fixInteger($type1, $type2)
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{
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$result = $type1;
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if (strtolower($type1) == 'integer' && strtolower(substr($type2, 0, 8)) == 'unsigned')
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{
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$result = 'int';
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}
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return $result;
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}
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/**
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* Fixes up a string for inclusion in a query.
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* Replaces name quote character with normal quote for literal.
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* Drops trailing semi-colon. Injects the database prefix.
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*
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* @param string $string The input string to be cleaned up.
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*
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* @return string The modified string.
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*
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* @since 2.5
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*/
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private function fixQuote($string)
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{
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$string = str_replace('`', '', $string);
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$string = str_replace(';', '', $string);
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$string = str_replace('#__', $this->db->getPrefix(), $string);
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return $this->db->quote($string);
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}
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}
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