# sqlsrv_rollback

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sqlsrv_rollback — Rolls back a transaction that was begun with sqlsrv_begin_transaction()

### 说明

sqlsrv_rollback ( resource `$conn` ) : bool

Rolls back a transaction that was begun with sqlsrv_begin_transaction() and returns the connection to auto-commit mode.

### 参数

`conn`

  The connection resource returned by a call to sqlsrv_connect().

### 返回值

成功时返回 `TRUE`， 或者在失败时返回 `FALSE`。

### 范例

Example #1 sqlsrv_rollback() example

The following example demonstrates how to use sqlsrv_begin_transaction() together with sqlsrv_commit() and sqlsrv_rollback().

    <?php
    $serverName = "serverName\sqlexpress";
    $connectionInfo = array( "Database"=>"dbName", "UID"=>"userName", "PWD"=>"password");
    $conn = sqlsrv_connect( $serverName, $connectionInfo);
    if( $conn === false ) {
        die( print_r( sqlsrv_errors(), true ));
    }

    /* Begin the transaction. */
    if ( sqlsrv_begin_transaction( $conn ) === false ) {
         die( print_r( sqlsrv_errors(), true ));
    }

    /* Initialize parameter values. */
    $orderId = 1; $qty = 10; $productId = 100;

    /* Set up and execute the first query. */
    $sql1 = "INSERT INTO OrdersTable (ID, Quantity, ProductID)
             VALUES (?, ?, ?)";
    $params1 = array( $orderId, $qty, $productId );
    $stmt1 = sqlsrv_query( $conn, $sql1, $params1 );

    /* Set up and execute the second query. */
    $sql2 = "UPDATE InventoryTable
             SET Quantity = (Quantity - ?)
             WHERE ProductID = ?";
    $params2 = array($qty, $productId);
    $stmt2 = sqlsrv_query( $conn, $sql2, $params2 );

    /* If both queries were successful, commit the transaction. */
    /* Otherwise, rollback the transaction. */
    if( $stmt1 && $stmt2 ) {
         sqlsrv_commit( $conn );
         echo "Transaction committed.<br />";
    } else {
         sqlsrv_rollback( $conn );
         echo "Transaction rolled back.<br />";
    }
    ?>

### 参见

- sqlsrv_begin_transaction() - Begins a database transaction
- sqlsrv_commit() - Commits a transaction that was begun with sqlsrv_begin_transaction