TableSelect::lockShared

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TableSelect::lockShared — Execute SHARED LOCK

说明

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

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 = mysql_xdevapi\getSession("mysqlx://user:password@localhost");

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

$session->startTransaction();

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

$session->commit();

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

以上例程的输出类似于：

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