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