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PDO->exec() --  Execute an SQL statement and return the number of affected rows


class PDO {

int exec ( string statement )


PDO->exec() executes an SQL statement in a single function call, returning the number of rows affected by the statement.

PDO->exec() does not return results from a SELECT statement. For a SELECT statement that you only need to issue once during your program, consider issuing PDO->query(). For a statement that you need to issue multiple times, prepare a PDOStatement object with PDO->prepare() and issue the statement with PDOStatement->execute().

Seznam parametrů


The SQL statement to prepare and execute.

Návratové hodnoty

PDO->exec() returns the number of rows that were modified or deleted by the SQL statement you issued. If no rows were affected, PDO->exec() returns 0.


Tato funkce může vracet booleovskou hodnotu FALSE, ale také nebooleovskou hodnotu odpovídající ohodnocení FALSE, například 0 nebo "". Čtěte prosím sekci o typu Boolean, kde najdete více informací. Pro testování návratové hodnoty této funkce použijte operátor ===.

The following example incorrectly relies on the return value of PDO->exec(), wherein a statement that affected 0 rows results in a call to die():

->exec() or die($db->errorInfo());


Příklad 1. Issuing a DELETE statement

Count the number of rows deleted by a DELETE statement with no WHERE clause.

= new PDO('odbc:sample', 'db2inst1', 'ibmdb2');

/* Delete all rows from the FRUIT table */
$count = $dbh->exec("DELETE FROM fruit WHERE colour = 'red'");

/* Return number of rows that were deleted */
print("Deleted $count rows.\n");

Výše uvedený příklad vypíše:

Deleted 1 rows.