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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<reference xml:id="ref.pdo-mysql" xmlns="http://docbook.org/ns/docbook">
<?phpdoc extension-membership="bundledexternal" ?>
<title>MySQL Functions (PDO_MYSQL)</title>
<titleabbrev>MySQL (PDO)</titleabbrev>
<partintro>
<section xml:id="ref.pdo-mysql.intro">
&reftitle.intro;
<para>
PDO_MYSQL is a driver that implements the <link linkend="intro.pdo">PHP
Data Objects (PDO) interface</link>
to enable access from PHP to MySQL databases.
</para>
<para>
PDO_MYSQL uses emulated prepares by default.
</para>
<para>
<emphasis role="bold">MySQL 8</emphasis>
</para>
<para>
When running a PHP version before 7.1.16, or PHP 7.2 before 7.2.4, set
MySQL 8 Server's default password plugin to <emphasis>mysql_native_password</emphasis>
or else you will see errors similar to
<emphasis>The server requested authentication method unknown to the client [caching_sha2_password]</emphasis>
even when <emphasis>caching_sha2_password</emphasis> is not used.
</para>
<para>
This is because MySQL 8 defaults to caching_sha2_password, a plugin that is
not recognized by the older PHP (mysqlnd) releases. Instead, change it by
setting <literal>default_authentication_plugin=mysql_native_password</literal>
in <filename>my.cnf</filename>. The <emphasis>caching_sha2_password</emphasis>
plugin is fully supported as of PHP 7.4.4. For older releases, the
<link linkend="book.mysql-xdevapi">mysql_xdevapi</link> extension does
support it.
</para>
<warning>
<para>
Beware: Some MySQL table types (storage engines) do not support transactions. When
writing transactional database code using a table type that does not support
transactions, MySQL will pretend that a transaction was initiated successfully.
In addition, any DDL queries issued will implicitly
commit any pending transactions.
</para>
</warning>
<note>
<para>
The MySQL driver does not properly support <constant>PDO::PARAM_INPUT_OUTPUT</constant>
via <methodname>PDOStatement::bindParam</methodname>; while such parameters can be used,
they are not updated (i.e. the actual output is ignored).
</para>
</note>
</section>
&reference.pdo-mysql.configure;
&reference.pdo-mysql.constants;
&reference.pdo-mysql.ini;
</partintro>
<refentry xml:id="ref.pdo-mysql.connection">
<refnamediv>
<refname>PDO_MYSQL DSN</refname>
<refpurpose>Connecting to MySQL databases</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<para>
The PDO_MYSQL Data Source Name (DSN) is composed of the following elements:
<variablelist>
<varlistentry>
<term>DSN prefix</term>
<listitem>
<para>
The DSN prefix is <userinput>mysql:</userinput>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>host</literal></term>
<listitem>
<para>
The hostname on which the database server resides.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>port</literal></term>
<listitem>
<para>
The port number where the database server is listening.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>dbname</literal></term>
<listitem>
<para>
The name of the database.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>unix_socket</literal></term>
<listitem>
<para>
The MySQL Unix socket (shouldn't be used with <literal>host</literal>
or <literal>port</literal>).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>charset</literal></term>
<listitem>
<para>
The character set. See the <link linkend="mysqlinfo.concepts.charset">character set</link>
concepts documentation for more information.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>PDO_MYSQL DSN examples</title>
<para>
The following example shows a PDO_MYSQL DSN for connecting to
MySQL databases:
<programlisting>
<![CDATA[
mysql:host=localhost;dbname=testdb
]]>
</programlisting>
More complete examples:
<programlisting>
<![CDATA[
mysql:host=localhost;port=3307;dbname=testdb
mysql:unix_socket=/tmp/mysql.sock;dbname=testdb
]]>
</programlisting>
</para>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<title>Unix only:</title>
<para>
When the host name is set to <literal>"localhost"</literal>, then the connection to the
server is made through a domain socket. If PDO_MYSQL is compiled against libmysqlclient then the
location of the socket file is at libmysqlclient's compiled in location. If PDO_MYSQL is compiled
against mysqlnd a default socket can be set through the <link linkend="ini.pdo-mysql.default-socket">
pdo_mysql.default_socket</link> setting.
</para>
</note>
</refsect1>
</refentry>
</reference>
&reference.pdo-mysql.pdo-mysql;
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