Executes a SQL query, but fetches only the the specificed count of rows. It is an emulation of the MySQL LIMIT option.
the SQL query
the row to start to fetch. Note that 0 returns the first row, 1 returns the second row, etc.
the numbers of rows to fetch
array, string or numeric data to be added to the prepared statement. Quantity of items passed must match quantity of placeholders in the prepared statement: meaning 1 placeholder for non-array parameters or 1 placeholder per array element.
mixed - a new DB_result object for queries that return results (such as SELECT queries), DB_OK for queries that manipulate data (such as INSERT queries) or a DB_Error object on failure
Tabel 34-1. Mogelijke PEAR_Error waarden
Error code | Error message | Reason | Solution |
---|---|---|---|
DB_ERROR_NODBSELECTED | no database selected | 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. |
Deze functie kan niet statisch worden aangeroepen.
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.
Voorbeeld 34-1. Using limitQuery()
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