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<?php
/**
* QueryBuilder class file.
*
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2012 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db\dao\mysql;
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use yii\db\Exception;
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/**
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* QueryBuilder is the query builder for MySQL databases.
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*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class QueryBuilder extends \yii\db\dao\QueryBuilder
{
/**
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* @var array mapping from abstract column types (keys) to physical column types (values).
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*/
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public $typeMap = array(
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Driver::TYPE_PK => 'int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY',
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Driver::TYPE_STRING => 'varchar(255)',
Driver::TYPE_TEXT => 'text',
Driver::TYPE_SMALLINT => 'smallint(6)',
Driver::TYPE_INTEGER => 'int(11)',
Driver::TYPE_BIGINT => 'bigint(20)',
Driver::TYPE_FLOAT => 'float',
Driver::TYPE_DECIMAL => 'decimal',
Driver::TYPE_DATETIME => 'datetime',
Driver::TYPE_TIMESTAMP => 'timestamp',
Driver::TYPE_TIME => 'time',
Driver::TYPE_DATE => 'date',
Driver::TYPE_BINARY => 'blob',
Driver::TYPE_BOOLEAN => 'tinyint(1)',
Driver::TYPE_MONEY => 'decimal(19,4)',
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);
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/**
* Builds a SQL statement for renaming a column.
* @param string $table the table whose column is to be renamed. The name will be properly quoted by the method.
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* @param string $oldName the old name of the column. The name will be properly quoted by the method.
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* @param string $newName the new name of the column. The name will be properly quoted by the method.
* @return string the SQL statement for renaming a DB column.
*/
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public function renameColumn($table, $oldName, $newName)
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{
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$quotedTable = $this->quoteTableName($table);
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$row = $this->connection->createCommand('SHOW CREATE TABLE ' . $quotedTable)->queryRow();
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if ($row === false) {
throw new Exception("Unable to find '$oldName' in table '$table'.");
}
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if (isset($row['Create Table'])) {
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$sql = $row['Create Table'];
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} else {
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$row = array_values($row);
$sql = $row[1];
}
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if (preg_match_all('/^\s*`(.*?)`\s+(.*?),?$/m', $sql, $matches)) {
foreach ($matches[1] as $i => $c) {
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if ($c === $oldName) {
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return "ALTER TABLE $quotedTable CHANGE "
. $this->quoteColumnName($oldName, true) . ' '
. $this->quoteColumnName($newName, true) . ' '
. $matches[2][$i];
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}
}
}
// try to give back a SQL anyway
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return "ALTER TABLE $quotedTable CHANGE "
. $this->quoteColumnName($oldName, true) . ' '
. $this->quoteColumnName($newName, true);
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}
/**
* Builds a SQL statement for dropping a foreign key constraint.
* @param string $name the name of the foreign key constraint to be dropped. The name will be properly quoted by the method.
* @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
* @return string the SQL statement for dropping a foreign key constraint.
*/
public function dropForeignKey($name, $table)
{
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return 'ALTER TABLE ' . $this->quoteTableName($table)
. ' DROP FOREIGN KEY ' . $this->quoteColumnName($name);
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}
}