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CollectionFind::lockShared

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CollectionFind::lockShared — Execute operation with SHARED LOCK

Description

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

Allows 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.

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Parameters

lock_waiting_option

Optional waiting option. By default it is MYSQLX_LOCK_DEFAULT. Valid values are these constants:

  • MYSQLX_LOCK_DEFAULT

  • MYSQLX_LOCK_NOWAIT

  • MYSQLX_LOCK_SKIP_LOCKED

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Return Values

A CollectionFind object that can be used for further processing

PHP: CollectionFind::lockShared - Manual Home of Manuel PHP  Contents Haut

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();
?>
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-mysql-xdevapi-collectionfind.lockshared.html

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References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

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