Manuál PHP | ||
---|---|---|
PÅ™edcházejÃcà | Dalšà |
PDO->query()
(no version information, might be only in CVS)
PDO->query() -- Executes an SQL statement, returning a result set as a PDOStatement objectPopis
class PDO {PDOStatement query ( string statement )
}class PDO {
bool query ( string statement, int PDO::FETCH_COLUMN, int colno )
}class PDO {
bool query ( string statement, int PDO::FETCH_CLASS, string classname, array ctorargs )
}class PDO {
bool query ( string statement, int PDO::FETCH_INTO, object object )
}
PDO->query() executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object.
For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO->prepare() and issue the statement with multiple calls to PDOStatement->execute().
If you do not fetch all of the data in a result set before issuing your next call to PDO->query(), your call may fail. Call PDOStatement->closeCursor() to release the database resources associated with the PDOStatement object before issuing your next call to PDO->query().
Poznámka: Although this function is only documented as having a single parameter, you may pass additional arguments to this function. They will be treated as though you called PDOStatement->setFetchMode() on the resultant statement object.
PÅ™Ãklady
PÅ™Ãklad 1. Demonstrate PDO::query A nice feature of PDO->query() is that it enables you to iterate over the rowset returned by a successfully executed SELECT statement.
Výše uvedený pÅ™Ãklad vypÃÅ¡e:
|
PÅ™edcházejÃcà | Domů | Dalšà |
PDO->prepare() | Nahoru |