# TableSelect::lockExclusive

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TableSelect::lockExclusive — Execute EXCLUSIVE LOCK

### 说明

public 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.

### 参数

`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`

### 返回值

TableSelect object.

### 示例

示例 #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);
?>`

以上示例的输出类似于：

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

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