(no version information, might be only in CVS)
Execute an SQL statement and return the number of affected rows
( string statement )
PDO::exec() executes an SQL statement in
a single function call, returning the number of rows affected by the
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().
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.
This function may
return Boolean FALSE, but may also return a non-Boolean value which
evaluates to FALSE, such as 0 or
"". Please read the section on Booleans for more
information. Use the ===
operator for testing the return value of this
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():
$db->exec() or die($db->errorInfo());