CollectionFind::lockShared
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CollectionFind::lockShared — Execute operation with SHARED LOCK
说明
$lock_waiting_option = ?): mysql_xdevapi\CollectionFindAllows to share the documents between multiple transactions which are locking in shared mode.
Other sessions can read the rows, but cannot modify them until your transaction commits.
If any of these rows were changed by another transaction that hasn't been committed, the query will wait until that transaction has ended to be able to use the latest values.
参数
-
lock_waiting_option -
Optional waiting option. By default it is
MYSQLX_LOCK_DEFAULT. Valid values are these constants:MYSQLX_LOCK_DEFAULTMYSQLX_LOCK_NOWAITMYSQLX_LOCK_SKIP_LOCKED
返回值
A CollectionFind object that can be used for further processing
示例
示例 #1 mysql_xdevapi\CollectionFind::lockShared() example
<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");
$schema = $session->getSchema("addressbook");
$collection = $schema->createCollection("people");
$session->startTransaction();
$result = $collection
->find("age > 50")
->lockShared()
->execute();
// ... read the object in shared mode
// Complete the transaction and unlock the document
$session->commit();
?>
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