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MDB_Common::limitQuery()
Descripción
Executes a SQL query, but fetches only the the specificed count of rows. It is an emulation of the MySQL LIMIT option.
Parámetro
- 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
Lanza
Tabla 35-1. Posibles valores de PEAR_Error
| 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. |
Nota
Esta función no puede ser llamada estáticamente.
| Aviso |
Este módulo es EXPERIMENTAL. Esto significa que el comportamiento de estasfunciones, sus nombres, más concretamente: CUALQUIER cosa de lo que hemos documentado aquí puede cambiar en futuras versiones del paqueteSIN AVISAR. Queda advertido, y usa este módulo bajo tu propio riesgo. |
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.
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