MDB_Common::limitQuery()
Synopsis
mixed &limitQuery
(
string $query
,
array
$types
, integer $from
, integer $count
)
Описание
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
Throws
| Error code | Error message | Reason | Solution |
|---|---|---|---|
| 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-Руководство 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. |
Замечание
This function can not be called statically.
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.