Query/classes/db_sql.php

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<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
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* @author Timothy J. Warren
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* @copyright Copyright (c) 2012
* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
* @package Query
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*/
// --------------------------------------------------------------------------
/**
* Abstract parent for database manipulation subclasses
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*
* @package Query
* @subpackage Query
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*/
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abstract class DB_SQL {
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// --------------------------------------------------------------------------
// ! Methods to override
// --------------------------------------------------------------------------
/**
* Get the max keyword sql
*
* @return string
*/
public function max()
{
return ' MAX';
}
// --------------------------------------------------------------------------
/**
* Get the min keyword sql
*
* @return string
*/
public function min()
{
return ' MIN';
}
// --------------------------------------------------------------------------
/**
* Get the 'distinct' keyword
*
* @return string
*/
public function distinct()
{
return ' DISTINCT ';
}
// --------------------------------------------------------------------------
/**
* Get the 'average' keyword
*
* @return string
*/
public function avg()
{
return ' AVG';
}
// --------------------------------------------------------------------------
/**
* Get the 'sum' keyword
*
* @return string
*/
public function sum()
{
return ' SUM';
}
// --------------------------------------------------------------------------
// ! Abstract Methods
// --------------------------------------------------------------------------
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/**
* Get database specific sql for limit clause
*
* @abstract
* @param string $sql
* @param int $limit
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* @param int $offset
* @return string
*/
abstract public function limit($sql, $limit, $offset=FALSE);
/**
* Get the sql for random ordering
*
* @abstract
* @return string
*/
abstract public function random();
/**
* Returns sql to list other databases
*
* @return string
*/
abstract public function db_list();
/**
* Returns sql to list tables
*
* @return string
*/
abstract public function table_list();
/**
* Returns sql to list system tables
*
* @return string
*/
abstract public function system_table_list();
/**
* Returns sql to list views
*
* @return string
*/
abstract public function view_list();
/**
* Returns sql to list triggers
*
* @return string
*/
abstract public function trigger_list();
/**
* Return sql to list functions
*
* @return FALSE
*/
abstract public function function_list();
/**
* Return sql to list stored procedures
*
* @return string
*/
abstract public function procedure_list();
/**
* Return sql to list sequences
*
* @return string
*/
abstract public function sequence_list();
/**
* Return sql to list database field types
*
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* @return mixed
*/
abstract public function type_list();
/**
* Get information about the columns in the
* specified table
*
* @param string
* @return string
*/
abstract public function column_list($table);
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}
// End of db_sql.php