TableSelect::lockShared

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TableSelect::lockShared — Execute SHARED LOCK

说明

public mysql_xdevapi\TableSelect mysql_xdevapi\TableSelect::lockShared ([ integer $lock_waiting_option ] )

Execute a read operation with SHARED 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

A TableSelect object.

范例

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


<?php

$session->startTransaction();
$res = $table->select('ordinal', 'n')->where("ordinal like '3'")->lockShared(MYSQLX_LOCK_NOWAIT)->execute();
$session->commit();

?>