Execute EXCLUSIVE LOCK

# TableSelect::lockExclusive

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TableSelect::lockExclusive — Execute EXCLUSIVE LOCK

### Description

public function mysql_xdevapi\TableSelect::lockExclusive(int `$lock_waiting_option` = ?): mysql_xdevapi\TableSelect

Execute a read operation with EXCLUSIVE LOCK. Only one lock can be active at a time.

### Parameters

`lock_waiting_option`

  The optional waiting option that defaults to `MYSQLX_LOCK_DEFAULT`. Valid values are:

  - `MYSQLX_LOCK_DEFAULT`

  - `MYSQLX_LOCK_NOWAIT`

  - `MYSQLX_LOCK_SKIP_LOCKED`

### Return Values

TableSelect object.

### Examples

Example #1 mysql_xdevapi\TableSelect::lockExclusive() example

    <?php
    $session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");

    $schema = $session->getSchema("addressbook");
    $table  = $schema->getTable("names");

    $session->startTransaction();

    $result = $table->select('name', 'age')
      ->lockExclusive(MYSQLX_LOCK_NOWAIT)
      ->execute();

    $session->commit();

    $row = $result->fetchAll();
    print_r($row);
    ?>

The above example will output something similar to:

    Array
    (
        [0] => Array
            (
                [name] => John
                [age] => 42
            )
        [1] => Array
            (
                [name] => Sam
                [age] => 42
            )
    )

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