- PHP Manual
- mysql_xdevapi\CollectionFind
- Execute operation with SHARED LOCK
CollectionFind::lockShared
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CollectionFind::lockShared — Execute operation with SHARED LOCK
Description
$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 has not yet committed,
your query waits until that transaction ends and then uses the latest values.
Parameters
-
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
Return Values
A CollectionFind object that can be used for further processing
Examples
Example #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();
?>
