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MDB_Common::limitQuery()

MDB_Common::limitQuery() -- send a limited query to the database

Synopsis

require_once 'MDB.php';

mixed &limitQuery (string $query, array [$types], integer $from, integer $count)

Description

Executes a SQL query, but fetches only the the specificed count of rows. It is an emulation of the MySQL LIMIT option.

Parameter

string $query: the SQL query
array $types: if supplied, the types of the columns in the result set will be set for fetching
integer $from: the row to start to fetch
integer $count: the numbers of rows to fetch

Return value

mixed - a new a resource id/MDB_OK or a MDB_Error, if fail

Throws

Table 21-1. Possible PEAR_Error values

Error code	Error message	Reason	Solution
`MDB_ERROR_NO_DB_SELECTED`	`NULL`	No database was choosen.	Check the DSN in connect() .
every other error code		Database specific error	Check the database related section of PHP-Manual to detect the reason for this error. In the most cases a misformed SQL statment. Ie. using LIMIT in a SQL-Statment for an Oracle database.

Note

This function can not be called statically.

Warning

This module is EXPERIMENTAL. That means that the behaviour of these functions, these function names, in concreto ANYTHING documented here can change in a future release of this package WITHOUT NOTICE. Be warned, and use this module at your own risk.

Depending on the database you will not really get more speed compared to query() . The advantage of limitQuery() is the deleting of unneeded rows in the resultset, as early as possible. So this can decrease memory usage.

See

query()

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