MySQL Functions (PDO_MYSQL)

소개

PDO_MYSQL is a driver that implements the PHP Data Objects (PDO) interface to enable access from PHP to MySQL 3.x, 4.x and 5.x databases.

PDO_MYSQL will take advantage of native prepared statement support present in MySQL 4.1 and higher. If you're using an older version of the mysql client libraries, PDO will emulate them for you.

Warning

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.

설치

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 than 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. As of PHP 5.4, 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 constants, 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.

변경점
버전 설명
5.4.0 mysqlnd became the default MySQL library when compiling PDO_MYSQL. Previously, libmysqlclient was the default MySQL library.
5.4.0 MySQL client libraries 4.1 and below are no longer supported.
5.3.9 Added SSL support with mysqlnd and OpenSSL.
5.3.7 Added SSL support with libmysqlclient and OpenSSL.

예약 상수

아래 상수는 이 드라이버에서 정의된 것으로, 확장을 PHP에 컴파일하였거나 실행중에 동적 로드하였을 때만 사용할 수 있습니다. 추가로, 드라이버-특정 상수는 이 드라이버를 사용할 때만 사용할 수 있습니다. mysql-특정 속성를 postgres 드라이버에서 사용하면 기대하지 않은 작동을 할 수 있습니다. 코드에서 여러 드라이버를 실행한다면, PDO::getAttribute()를 사용하여 PDO_ATTR_DRIVER_NAME 속성으로 드라이버를 확인할 수 있습니다.

PDO::MYSQL_ATTR_USE_BUFFERED_QUERY (integer)
If this attribute is set to TRUE on a PDOStatement, the MySQL driver will use the buffered versions of the MySQL API. If you're writing portable code, you should use PDOStatement::fetchAll() instead.

Example #1 Forcing queries to be buffered in mysql

<?php
if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') {
    
$stmt $db->prepare('select * from foo',
        array(
PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true));
} else {
    die(
"my application only works with mysql; I should use \$stmt->fetchAll() instead");
}
?>

PDO::MYSQL_ATTR_LOCAL_INFILE (integer)

Enable LOAD LOCAL INFILE.

Note, this constant can only be used in the driver_options array when constructing a new database handle.

PDO::MYSQL_ATTR_INIT_COMMAND (integer)

Command to execute when connecting to the MySQL server. Will automatically be re-executed when reconnecting.

Note, this constant can only be used in the driver_options array when constructing a new database handle.

PDO::MYSQL_ATTR_READ_DEFAULT_FILE (integer)

Read options from the named option file instead of from my.cnf. This option is not available if mysqlnd is used, because mysqlnd does not read the mysql configuration files.

PDO::MYSQL_ATTR_READ_DEFAULT_GROUP (integer)

Read options from the named group from my.cnf or the file specified with MYSQL_READ_DEFAULT_FILE. This option is not available if mysqlnd is used, because mysqlnd does not read the mysql configuration files.

PDO::MYSQL_ATTR_MAX_BUFFER_SIZE (integer)

Maximum buffer size. Defaults to 1 MiB. This constant is not supported when compiled against mysqlnd.

PDO::MYSQL_ATTR_DIRECT_QUERY (integer)

Perform direct queries, don't use prepared statements.

PDO::MYSQL_ATTR_FOUND_ROWS (integer)

Return the number of found (matched) rows, not the number of changed rows.

PDO::MYSQL_ATTR_IGNORE_SPACE (integer)

Permit spaces after function names. Makes all functions names reserved words.

PDO::MYSQL_ATTR_COMPRESS (integer)

Enable network communication compression. This is also supported when compiled against mysqlnd as of PHP 5.3.11.

PDO::MYSQL_ATTR_SSL_CA (integer)

The file path to the SSL certificate authority.

다음부터 존재: PHP 5.3.7.

PDO::MYSQL_ATTR_SSL_CAPATH (integer)

The file path to the directory that contains the trusted SSL CA certificates, which are stored in PEM format.

다음부터 존재: PHP 5.3.7.

PDO::MYSQL_ATTR_SSL_CERT (integer)

The file path to the SSL certificate.

다음부터 존재: PHP 5.3.7.

PDO::MYSQL_ATTR_SSL_CIPHER (integer)

A list of one or more permissible ciphers to use for SSL encryption, in a format understood by OpenSSL. For example: DHE-RSA-AES256-SHA:AES128-SHA

다음부터 존재: PHP 5.3.7.

PDO::MYSQL_ATTR_SSL_KEY (integer)

The file path to the SSL key.

다음부터 존재: PHP 5.3.7.

PDO::MYSQL_ATTR_MULTI_STATEMENTS (integer)

Disables multi query execution in both PDO::prepare() and PDO::query() when set to FALSE.

Note, this constant can only be used in the driver_options array when constructing a new database handle.

다음부터 존재: PHP 5.5.21 and PHP 5.6.5.

실행시 설정

이 함수의 작동은 php.ini 설정에 영향을 받습니다.

PDO_MYSQL Configuration Options
이름 기본값 가변성
pdo_mysql.default_socket "/tmp/mysql.sock" PHP_INI_SYSTEM
pdo_mysql.debug NULL PHP_INI_SYSTEM
PHP_INI_* 모드에 대한 상세와 정의는 Where a configuration setting may be set를 참고하십시오.

위 설정 지시어에 대한 간단한 설명입니다.

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 boolean

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

Table of Contents

add a note add a note

User Contributed Notes 8 notes

up
6
Desislav Kamenov
4 years ago
There is an important undocumented attribute which disables certificate CN verification available after
5.6.22 (not sure), 7.0.18 (verified) and 7.1.15 (not sure)

PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT

possible values: true, false
default value: true

Related PHP bugs:
https://bugs.php.net/bug.php?id=71845
https://bugs.php.net/bug.php?id=71003

and github PR: https://github.com/php/php-src/pull/1913
up
9
brian at diamondsea dot com
13 years ago
SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. ...

After spending hours trying to track down why we were getting this error on a new server, after the same code ran fine on other servers, we found the problem to be an old MySQL _client_ library running on our web server, and a latest-version MySQL _server_ running on the database server's box.

Upgraded the MySQL client on the web server to the current revision and the problem went away.
up
2
davey at php dot net
14 years ago
To use "PDO::MYSQL_ATTR_USE_BUFFERED_QUERY" you should call
PDO::setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);

It will not work when passed into PDO::prepare()
up
1
rmottey at gmail dot com
14 years ago
I have been getting the error below when performing multiple queries within a single page.

Setting the attribute below did not seem to work for me.

So building on previous example i am initilizing my stmt  variable on every query and a fetch all into an array. Seems to be working for me.

Error:
PDO Error 1.1: Array ( [0] => xxx[1] => yyy[2] => Lost connection to MySQL server during query )

Fix:

(PDO::setAttribute("PDO::MYSQL_ATTR_USE_BUFFERED_QUERY", true);)

<?

try {
        $dbh = new PDO('mysql:host=xxx;port=xxx;dbname=xxx', 'xxx', 'xxx', array( PDO::ATTR_PERSISTENT => false));
$stmt = $dbh->prepare("CALL getname()");

        // call the stored procedure
        $stmt->execute();
      // fetch all rows into an array.
       $rows = $stmt->fetchAll();
       foreach ($rows as $rs)
    {
          $id = $rs['id'];
         }
//initilise the statement
unset($stmt);
$stmt = $dbh->prepare("call secondprocedure(?);");
$stmt->bindValue(1, $id);
if ( ! $stmt->execute() )
{
    echo "PDO Error 1.1:\n";
    print_r($stmt->errorInfo());
    exit;
}
unset($stmt);
} catch (PDOException $e) {
        print "Error!: " . $e->getMessage() . "<br/>";
        die();
    }
?>
up
0
curt at webmasterbond dot com
11 years ago
Today's PHP snapshot now has SSL support for PDO. Follow the directions here ( http://dev.mysql.com/doc/refman/5.0/en/secure-create-certs.html ) to set up MySQL and then use the following connection options:

<?php
$pdo
= new PDO(
   
'mysql:host=hostname;dbname=ssldb',
   
'username',
   
'password',
    array(
       
PDO::MYSQL_ATTR_SSL_KEY    =>'/path/to/client-key.pem',
       
PDO::MYSQL_ATTR_SSL_CERT=>'/path/to/client-cert.pem',
       
PDO::MYSQL_ATTR_SSL_CA    =>'/path/to/ca-cert.pem'
   
)
);
?>
up
-3
miller_kurt_e at yahoo dot com
13 years ago
SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. ...

This one can be a royal pain to deal with.  Never stack statements to be executed in one go.  Nobody ever mentions this possibility in all the posts I've seen dealing with this error.

This example is a Zend Framework example but the theory is the same.

As in:

<?php
$sql
= <<<____SQL
     CREATE TABLE IF NOT EXISTS `ticket_hist` (
       `tid` int(11) NOT NULL,
       `trqform` varchar(40) NOT NULL,
       `trsform` varchar(40) NOT NULL,
       `tgen` datetime NOT NULL,
       `tterm` datetime,
       `tstatus` tinyint(1) NOT NULL
     ) ENGINE=ARCHIVE COMMENT='ticket archive';
     CREATE TABLE IF NOT EXISTS `request_hist` (
       `rqid` int(11) NOT NULL,
       `rqtid` int(11) NOT NULL,
       `rqsid` int(11) NOT NULL,
       `rqdate` datetime NOT NULL,
       `rqcode` tinyint(1) NOT NULL,
       `rssid` int(11) NOT NULL,
       `rsdate` datetime,
       `rscode` tinyint(1)
     ) ENGINE=ARCHIVE COMMENT='request archive';
     CREATE TABLE IF NOT EXISTS `relay_hist` (
       `rqid` int(5) NOT NULL,
       `sdesc` varchar(40) NOT NULL,
       `rqemail` varchar(40) NOT NULL,
       `sid` int(11) NOT NULL,
       `rlsid` int(11) NOT NULL,
       `dcode` varchar(5) NOT NULL
     ) ENGINE=ARCHIVE COMMENT='relay archive';
____SQL;
$result = $this->db->getConnection()->exec($sql);
?>

This will run fine but PDO will balk with the 'unbuffered' error if you follow this with another query.

Instead do:

<?php
$sql
= <<<____SQL
     CREATE TABLE IF NOT EXISTS `ticket_hist` (
       `tid` int(11) NOT NULL,
       `trqform` varchar(40) NOT NULL,
       `trsform` varchar(40) NOT NULL,
       `tgen` datetime NOT NULL,
       `tterm` datetime,
       `tstatus` tinyint(1) NOT NULL
     ) ENGINE=ARCHIVE COMMENT='ticket archive';
____SQL;
$result = $this->db->getConnection()->exec($sql);

$sql = <<<____SQL
     CREATE TABLE IF NOT EXISTS `request_hist` (
       `rqid` int(11) NOT NULL,
       `rqtid` int(11) NOT NULL,
       `rqsid` int(11) NOT NULL,
       `rqdate` datetime NOT NULL,
       `rqcode` tinyint(1) NOT NULL,
       `rssid` int(11) NOT NULL,
       `rsdate` datetime,
       `rscode` tinyint(1)
     ) ENGINE=ARCHIVE COMMENT='request archive';
____SQL;
$result = $this->db->getConnection()->exec($sql);

$sql = <<<____SQL
     CREATE TABLE IF NOT EXISTS `relay_hist` (
       `rqid` int(5) NOT NULL,
       `sdesc` varchar(40) NOT NULL,
       `rqemail` varchar(40) NOT NULL,
       `sid` int(11) NOT NULL,
       `rlsid` int(11) NOT NULL,
       `dcode` varchar(5) NOT NULL
     ) ENGINE=ARCHIVE COMMENT='relay archive';
____SQL;
$result = $this->db->getConnection()->exec($sql);
?>

Chopping it into individual queries fixes the problem.
up
-3
vafa ghoreyshi atgmailcom
4 years ago
If you have the error 'could not find driver' and won't able to install driver for newer linux(Fedora, Redhat, CentOS) with latest PHP7/MariaDB10/Apache2.4 get this package installed and get every things smooth.
First download latest version of epel and remi for your distribution. This links is for Fedora 26:

wget https://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
wget https://rpms.remirepo.net/fedora/remi-release-26.rpm

Than install them

rpm -Uvh remi-release-26.rpm
rpm -Uvh epel-release-6-8.noarch.rpm

Know you can use remi repository to gest php-pdo and php-mysql.

yum --enablerepo=remi install php-pdo
yum --enablerepo=remi install php-mysql

Restart the Apache

systemctl stop httpd
systemctl start httpd

Good to go!
up
-28
Gerald Schneider
8 years ago
This page suggests that the constant PDO::MYSQL_ATTR_FOUND_ROWS  was always available (no note "exists as of X.X"), but I found the constant missing on an installation with PHP 5.2. After switching the PHP version to 5.3.27 on the webspace the constant was available.
To Top