Query/docs/files/drivers/mysql/mysql_sql.php.txt

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<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
* @package Query
* @author Timothy J. Warren
* @copyright Copyright (c) 2012 - 2014
* @link https://github.com/aviat4ion/Query
* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
namespace Query\Driver;
/**
* MySQL specifc SQL
*
* @package Query
* @subpackage Drivers
*/
class MySQL_SQL extends Abstract_SQL {
/**
* Limit clause
*
* @param string $sql
* @param int $limit
* @param int $offset
* @return string
*/
public function limit($sql, $limit, $offset=FALSE)
{
if ( ! is_numeric($offset))
{
return $sql." LIMIT {$limit}";
}
return $sql." LIMIT {$offset}, {$limit}";
}
// --------------------------------------------------------------------------
/**
* Get the query plan for the sql query
*
* @param string $sql
* @return string
*/
public function explain($sql)
{
return "EXPLAIN EXTENDED {$sql}";
}
// --------------------------------------------------------------------------
/**
* Random ordering keyword
*
* @return string
*/
public function random()
{
return ' RAND() DESC';
}
// --------------------------------------------------------------------------
/**
* Returns sql to list other databases
*
* @return string
*/
public function db_list()
{
return "SHOW DATABASES WHERE `Database` NOT IN ('information_schema','mysql')";
}
// --------------------------------------------------------------------------
/**
* Returns sql to list tables
*
* @param string $database
* @return string
*/
public function table_list($database='')
{
if ( ! empty($database)) return "SHOW TABLES FROM `{$database}`";
return 'SHOW TABLES';
}
// --------------------------------------------------------------------------
/**
* Overridden in MySQL class
*
* @return string
*/
public function system_table_list()
{
return 'SELECT `TABLE_NAME` FROM `information_schema`.`TABLES`
WHERE `TABLE_SCHEMA`=\'information_schema\'';
}
// --------------------------------------------------------------------------
/**
* Returns sql to list views
*
* @return string
*/
public function view_list()
{
return 'SELECT `table_name` FROM `information_schema`.`views`';
}
// --------------------------------------------------------------------------
/**
* Returns sql to list triggers
*
* @return string
*/
public function trigger_list()
{
return 'SHOW TRIGGERS';
}
// --------------------------------------------------------------------------
/**
* Return sql to list functions
*
* @return string
*/
public function function_list()
{
return 'SHOW FUNCTION STATUS';
}
// --------------------------------------------------------------------------
/**
* Return sql to list stored procedures
*
* @return string
*/
public function procedure_list()
{
return 'SHOW PROCEDURE STATUS';
}
// --------------------------------------------------------------------------
/**
* Return sql to list sequences
*
* @return NULL
*/
public function sequence_list()
{
return NULL;
}
// --------------------------------------------------------------------------
/**
* SQL to show list of field types
*
* @return string
*/
public function type_list()
{
return "SELECT DISTINCT `DATA_TYPE` FROM `information_schema`.`COLUMNS`";
}
// --------------------------------------------------------------------------
/**
* SQL to show infromation about columns in a table
*
* @param string $table
* @return string
*/
public function column_list($table)
{
return "SHOW FULL COLUMNS FROM {$table}";
}
// --------------------------------------------------------------------------
/**
* Get the list of foreign keys for the current
* table
*
* @param string $table
* @return string
*/
public function fk_list($table)
{
return <<<SQL
SELECT DISTINCT `kcu`.`COLUMN_NAME` as `child_column`,
`kcu`.`REFERENCED_TABLE_NAME` as `parent_table`,
`kcu`.`REFERENCED_COLUMN_NAME` as `parent_column`
FROM `INFORMATION_SCHEMA`.`TABLE_CONSTRAINTS` `tc`
INNER JOIN `INFORMATION_SCHEMA`.`KEY_COLUMN_USAGE` `kcu`
ON `kcu`.`CONSTRAINT_NAME`=`tc`.`CONSTRAINT_NAME`
WHERE `tc`.`CONSTRAINT_TYPE`='FOREIGN KEY'
AND `tc`.`TABLE_NAME`='{$table}'
-- AND `parent_table` IS NOT NULL
-- AND `parent_column` IS NOT NULL
SQL;
}
// --------------------------------------------------------------------------
/**
* Get the list of indexes for the current table
*
* @param string $table
* @return array
*/
public function index_list($table)
{
return "SHOW INDEX IN {$table}";
}
}
//End of mysql_sql.php