PDO::exec
(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0)
PDO::exec — Execute an SQL statement and return the number of affected rows
Description
$statement): int|falsePDO::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().
Parameters
-
statement -
The SQL statement to prepare and execute.
Data inside the query should be properly escaped.
Return Values
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. Please read the section on Booleans for more
information. Use the ===
operator for testing the return value of this
function.
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():
<?php
$db->exec() or die(print_r($db->errorInfo(), true)); // incorrect
?>
Examples
Example #1 Issuing a DELETE statement
Count the number of rows deleted by a DELETE statement with no WHERE clause.
<?php
$dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2');
/* Delete all rows from the FRUIT table */
$count = $dbh->exec("DELETE FROM fruit");
/* Return number of rows that were deleted */
print("Deleted $count rows.\n");
?>
The above example will output:
Deleted 1 rows.
See Also
- PDO::prepare() - Prepares a statement for execution and returns a statement object
- PDO::query() - Prepares and executes an SQL statement without placeholders
- PDOStatement::execute() - Executes a prepared statement
