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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 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 39-1. Possible PEAR_Error values

Error codeError messageReasonSolution
MDB_ERROR_NO_DB_SELECTED NULL No database was chosen. 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 statement. Ie. using LIMIT in a SQL-Statement 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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