PHP 5.6.0beta1 released

PDOStatement::closeCursor

(PHP 5 >= 5.1.0, PECL pdo >= 0.9.0)

PDOStatement::closeCursor Closes the cursor, enabling the statement to be executed again.

Description

public bool PDOStatement::closeCursor ( void )

PDOStatement::closeCursor() frees up the connection to the server so that other SQL statements may be issued, but leaves the statement in a state that enables it to be executed again.

This method is useful for database drivers that do not support executing a PDOStatement object when a previously executed PDOStatement object still has unfetched rows. If your database driver suffers from this limitation, the problem may manifest itself in an out-of-sequence error.

PDOStatement::closeCursor() is implemented either as an optional driver specific method (allowing for maximum efficiency), or as the generic PDO fallback if no driver specific function is installed. The PDO generic fallback is semantically the same as writing the following code in your PHP script:

<?php
do {
    while (
$stmt->fetch())
        ;
    if (!
$stmt->nextRowset())
        break;
} while (
true);
?>

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 A PDOStatement::closeCursor() example

In the following example, the $stmt PDOStatement object returns multiple rows but the application fetches only the first row, leaving the PDOStatement object in a state of having unfetched rows. To ensure that the application will work with all database drivers, the author inserts a call to PDOStatement::closeCursor() on $stmt before executing the $otherStmt PDOStatement object.

<?php
/* Create a PDOStatement object */
$stmt $dbh->prepare('SELECT foo FROM bar');

/* Create a second PDOStatement object */
$otherStmt $dbh->prepare('SELECT foobaz FROM foobar');

/* Execute the first statement */
$stmt->execute();

/* Fetch only the first row from the results */
$stmt->fetch();

/* The following call to closeCursor() may be required by some drivers */
$stmt->closeCursor();

/* Now we can execute the second statement */
$otherStmt->execute();
?>

See Also

add a note add a note

User Contributed Notes 2 notes

up
1
jhill9693 at gmail dot com
2 years ago
If you ran a SQL statement (vs a query that returns data) such as UPDATE, try unsetting your PDOStatement object instead of calling PDOStatement::closeCursor().
up
0
narada dot sage at googlemail dot com
7 years ago
When running multiple queries one after another especially when stored procedures are involved one must release all result sets and fetch all rows in each result set for a stored procedure before moving onto the next query.  This is important because a stored procedure returns an extra (empty) result set as a result of having called the procedure itself.

In my case calling PDOStatement :: closeCursor() did not work (on php-5.1.3-rc2) and I was presented with the following error message: "SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query" upon trying to PDO :: prepare() my second query.  So I used the following drop in replacement within one of my classes which fixed the issue.

<?php
/**
 * @param PDOStatement $oStm
 */
public static function closeCursor($oStm) {
    do
$oStm->fetchAll();
    while (
$oStm->nextRowSet());
}
?>
To Top