lockexclusive.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 86e6094e86b84a51d00ab217ac50ce8dde33d82a Maintainer: mumumu Status: ready -->

<refentry xml:id="mysql-xdevapi-tableselect.lockexclusive" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>TableSelect::lockExclusive</refname>
  <refpurpose>EXCLUSIVE LOCK を実行する</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type>mysql_xdevapi\TableSelect</type><methodname>mysql_xdevapi\TableSelect::lockExclusive</methodname>
   <methodparam choice="opt"><type>int</type><parameter>lock_waiting_option</parameter></methodparam>
  </methodsynopsis>
  <para>
   EXCLUSIVE LOCK 付きで読み取り操作を実行します。
   一度にアクティブになれるロックはひとつだけです。
  </para>

 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>lock_waiting_option</parameter></term>
    <listitem>
     <para>
      オプションで指定できる、ロック待ちのオプション。
      デフォルトは <constant>MYSQLX_LOCK_DEFAULT</constant> です。
      有効な値は以下のとおりです:
     </para>
     <itemizedlist>
      <listitem><para><constant>MYSQLX_LOCK_DEFAULT</constant></para></listitem>
      <listitem><para><constant>MYSQLX_LOCK_NOWAIT</constant></para></listitem>
      <listitem><para><constant>MYSQLX_LOCK_SKIP_LOCKED</constant></para></listitem>
     </itemizedlist>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   TableSelect オブジェクトを返します。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>mysql_xdevapi\TableSelect::lockExclusive</function> の例</title>
   <programlisting role="php">
<![CDATA[
<?php
$session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");

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

$session->startTransaction();

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

$session->commit();

$row = $result->fetchAll();
print_r($row);
?>
]]>
   </programlisting>
   &example.outputs.similar;
   <screen>
<![CDATA[
Array
(
    [0] => Array
        (
            [name] => John
            [age] => 42
        )
    [1] => Array
        (
            [name] => Sam
            [age] => 42
        )
)
]]>
   </screen>
  </example>
 </refsect1>

</refentry>

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