MySQL PDO Driver (PDO_MYSQL)

简介

PDO_MYSQL is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to MySQL databases.

PDO_MYSQL uses emulated prepares by default.

MySQL 8

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 mysql_native_password or else you will see errors similar to The server requested authentication method unknown to the client [caching_sha2_password] even when caching_sha2_password is not used.

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 default_authentication_plugin=mysql_native_password in my.cnf. The caching_sha2_password plugin is fully supported as of PHP 7.4.4. For older releases, the mysql_xdevapi extension does support it.

注意:

The MySQL driver does not properly support PDO::PARAM_INPUT_OUTPUT via PDOStatement::bindParam(); while such parameters can be used, they are not updated (i.e. the actual output is ignored).

安装

The common Unix distributions include binary versions of PHP that can be installed. Although these binary versions are typically built with support for the MySQL extensions, the extension libraries themselves may need to be installed using an additional package. Check the package manager that comes with your chosen distribution for availability.

For example, on Ubuntu the php5-mysql package installs the ext/mysql, ext/mysqli, and PDO_MYSQL PHP extensions. On CentOS, the php-mysql package also installs these three PHP extensions.

Alternatively, you can compile this extension yourself. Building PHP from source allows you to specify the MySQL extensions you want to use, as well as your choice of client library for each extension.

When compiling, use --with-pdo-mysql[=DIR] to install the PDO MySQL extension, where the optional [=DIR] is the MySQL base library. Mysqlnd is the default library. For details about choosing a library, see Choosing a MySQL library.

Optionally, the --with-mysql-sock[=DIR] sets to location to the MySQL unix socket pointer for all MySQL extensions, including PDO_MYSQL. If unspecified, the default locations are searched.

Optionally, the --with-zlib-dir[=DIR] is used to set the path to the libz install prefix.

$ ./configure --with-pdo-mysql --with-mysql-sock=/var/mysql/mysql.sock

SSL support is enabled using the appropriate Pdo\Mysql::ATTR_SSL_*, which is equivalent to calling the » MySQL C API function mysql_ssl_set(). Also, SSL cannot be enabled with PDO::setAttribute() because the connection already exists. See also the MySQL documentation about » connecting to MySQL with SSL.

预定义常量

下列常量由此驱动定义，且仅在扩展编译入 PHP 或在运行时动态载入时可用。另外，使用此驱动时，仅会使用这些驱动特定的常量。使用其他驱动的驱动特定的常量可能会导致不可预见的情况。如果代码可运行于多个驱动，PDO::getAttribute() 可被用于获取 PDO_ATTR_DRIVER_NAME 属性以检查驱动。

PDO::MYSQL_ATTR_USE_BUFFERED_QUERY (int)

别名 Pdo\Mysql::ATTR_USE_BUFFERED_QUERY

PDO::MYSQL_ATTR_LOCAL_INFILE (int)

别名 Pdo\Mysql::ATTR_LOCAL_INFILE

PDO::MYSQL_ATTR_LOCAL_INFILE_DIRECTORY (int)

别名 Pdo\Mysql::ATTR_LOCAL_INFILE_DIRECTORY. Available as of PHP 8.1.0.

PDO::MYSQL_ATTR_INIT_COMMAND (int)

别名 Pdo\Mysql::ATTR_INIT_COMMAND

PDO::MYSQL_ATTR_READ_DEFAULT_FILE (int)

别名 Pdo\Mysql::ATTR_READ_DEFAULT_FILE

PDO::MYSQL_ATTR_READ_DEFAULT_GROUP (int)

别名 Pdo\Mysql::ATTR_READ_DEFAULT_GROUP

PDO::MYSQL_ATTR_MAX_BUFFER_SIZE (int)

别名 Pdo\Mysql::ATTR_MAX_BUFFER_SIZE

PDO::MYSQL_ATTR_DIRECT_QUERY (int)

别名 PDO::ATTR_EMULATE_PREPARES

PDO::MYSQL_ATTR_FOUND_ROWS (int)

别名 Pdo\Mysql::ATTR_FOUND_ROWS

PDO::MYSQL_ATTR_IGNORE_SPACE (int)

别名 Pdo\Mysql::ATTR_IGNORE_SPACE

PDO::MYSQL_ATTR_COMPRESS (int)

别名 Pdo\Mysql::ATTR_COMPRESS

PDO::MYSQL_ATTR_SERVER_PUBLIC_KEY (int)

别名 Pdo\Mysql::ATTR_SERVER_PUBLIC_KEY

PDO::MYSQL_ATTR_SSL_CA (int)

别名 Pdo\Mysql::ATTR_SSL_CA

PDO::MYSQL_ATTR_SSL_CAPATH (int)

别名 Pdo\Mysql::ATTR_SSL_CAPATH

PDO::MYSQL_ATTR_SSL_CERT (int)

别名 Pdo\Mysql::ATTR_SSL_CERT

PDO::MYSQL_ATTR_SSL_CIPHER (int)

别名 Pdo\Mysql::ATTR_SSL_CIPHER

PDO::MYSQL_ATTR_SSL_KEY (int)

别名 Pdo\Mysql::ATTR_SSL_KEY

PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT (int)

别名 Pdo\Mysql::ATTR_SSL_VERIFY_SERVER_CERT Available as of PHP 7.0.18 and PHP 7.1.4.

PDO::MYSQL_ATTR_MULTI_STATEMENTS (int)

别名 Pdo\Mysql::ATTR_MULTI_STATEMENTS

运行时配置

这些函数的行为受 php.ini 中的设置影响。

PDO_MYSQL Configuration Options

名字	默认	可修改范围
pdo_mysql.default_socket	"/tmp/mysql.sock"	INI_SYSTEM
pdo_mysql.debug	NULL	INI_SYSTEM

有关 INI_* 样式的更多详情与定义，见 配置可被设定范围。

这是配置指令的简短说明。

pdo_mysql.default_socket string

Sets a Unix domain socket. This value can either be set at compile time if a domain socket is found at configure. This ini setting is Unix only.

pdo_mysql.debug bool

Enables debugging for PDO_MYSQL. This setting is only available when PDO_MYSQL is compiled against mysqlnd and in PDO debug mode.