Query/drivers/mysql/mysql_sql.php

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2012-04-10 14:06:34 -04:00
<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
* @author Timothy J. Warren
* @copyright Copyright (c) 2012
* @link https://github.com/aviat4ion/Query
* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
/**
* MySQL specifc SQL
*/
class MySQL_SQL extends DB_SQL{
/**
* Convienience public function for creating a new MySQL table
*
* @param string $name
* @param array $columns
* @param array $constraints=array()
* @param array $indexes=array()
*
* @return string
*/
public function create_table($name, $columns, array $constraints=array(), array $indexes=array())
{
$column_array = array();
// Reorganize into an array indexed with column information
// Eg $column_array[$colname] = array(
// 'type' => ...,
// 'constraint' => ...,
// 'index' => ...,
// )
foreach($columns as $colname => $type)
{
if(is_numeric($colname))
{
$colname = $type;
}
$column_array[$colname] = array();
$column_array[$colname]['type'] = ($type !== $colname) ? $type : '';
}
if( ! empty($constraints))
{
foreach($constraints as $col => $const)
{
$column_array[$col]['constraint'] = "{$const} ({$col})";
}
}
// Join column definitons together
$columns = array();
foreach($column_array as $n => $props)
{
$n = trim($n, '`');
$str = "`{$n}` ";
$str .= (isset($props['type'])) ? "{$props['type']} " : "";
$columns[] = $str;
}
// Add constraints
foreach($column_array as $n => $props)
{
if (isset($props['constraint']))
{
$columns[] = $props['constraint'];
}
}
// Generate the sql for the creation of the table
$sql = "CREATE TABLE IF NOT EXISTS `{$name}` (";
$sql .= implode(", ", $columns);
$sql .= ")";
return $sql;
}
// --------------------------------------------------------------------------
/**
* Convience public function for droping a MySQL table
*
* @param string $name
* @return string
*/
public function delete_table($name)
{
return "DROP TABLE `{$name}`";
}
// --------------------------------------------------------------------------
/**
* 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}";
}
// --------------------------------------------------------------------------
/**
* Random ordering keyword
*
* @return string
*/
public function random()
{
return ' RAND()';
}
// --------------------------------------------------------------------------
/**
* Create an SQL backup file for the current database's structure
*
* @return string
*/
public function backup_structure()
{
// @todo Implement Backup function
return '';
}
// --------------------------------------------------------------------------
/**
* Create an SQL backup file for the current database's data
*
* @return string
*/
public function backup_data()
{
// @todo Implement Backup function
return '';
}
// --------------------------------------------------------------------------
/**
* Returns sql to list other databases
*
* @return string
*/
public function db_list()
{
return "SHOW DATABASES WHERE `Database` !='information_schema'";
}
// --------------------------------------------------------------------------
/**
* Returns sql to list tables
*
* @return string
*/
public function table_list()
{
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\'';
2012-04-10 14:06:34 -04:00
}
// --------------------------------------------------------------------------
/**
* 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 FALSE
*/
public function sequence_list()
{
return FALSE;
}
}
//End of mysql_sql.php