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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.
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.
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.
版本 | 说明 |
---|---|
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. |
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
( integer )
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.
自以下版本起 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.
自以下版本起 PHP 5.3.7.
PDO::MYSQL_ATTR_SSL_CERT
( integer )
The file path to the SSL certificate.
自以下版本起 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
自以下版本起 PHP 5.3.7.
PDO::MYSQL_ATTR_SSL_KEY
( integer )
The file path to the SSL key.
自以下版本起 PHP 5.3.7.
这些函数的行为受 php.ini 中的设置影响。
名字 | 默认 | 可修改范围 |
---|---|---|
pdo_mysql.default_socket | "/tmp/mysql.sock" | PHP_INI_SYSTEM |
pdo_mysql.debug | NULL | PHP_INI_SYSTEM |
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
boolean Enables debugging for PDO_MYSQL. This setting is only available when PDO_MYSQL is compiled against mysqlnd and in PDO debug mode.
[#1] info at westgatesearch dot com [2014-10-31 23:39:29]
Here is a real world example of a PHP PDO MySQL Data Entry App with SQL Insert and redirect to a report to show the data "just entered" as auto-generated by an expert system, WizzyWeb
$handler = new PDO('mysql:host=localhost;dbname=db', 'username', 'password');
$sql = "INSERT INTO Employees (EmployeeFirstName, EmployeeLastName, EmployeeOffice, EmployeeDepartment, EmployeeEmailAddress, EmployeeExtension, EmployeeTitle) VALUES (:EmployeeFirstName, :EmployeeLastName, :EmployeeOffice, :EmployeeDepartment, :EmployeeEmailAddress, :EmployeeExtension, :EmployeeTitle)";
$query = $handler->prepare($sql);
$query->execute(array(
':EmployeeFirstName' => $EmployeeFirstName,
':EmployeeLastName' => $EmployeeLastName,
':EmployeeOffice' => $EmployeeOffice,
':EmployeeDepartment' => $EmployeeDepartment,
':EmployeeEmailAddress' => $EmployeeEmailAddress,
':EmployeeExtension' => $EmployeeExtension,
':EmployeeTitle' => $EmployeeTitle
));
// You can uncomment this code to see which PDO drivers are available and troubleshoot the PDO database connection
//try {
// print_r(PDO::getAvailableDrivers()); # Enumerates available PDO drivers available
// $handler = new PDO('mysql:host=localhost;dbname=db1', 'username', 'password');
// $handler->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
//} catch(PDOException $e) {
// echo $e->getMessage();
// die();
//}
header("Location: http://www.wizzyweb.com/php/report.php");
[#2] georgy dot garnov at gmail dot com [2014-10-14 10:27:04]
PDO::MYSQL_ATTR_LOCAL_INFILE - will not work if you have
open_basedir in your php.ini
[#3] kat dot shupe dot work at gmail dot com [2014-04-16 14:07:49]
So, I'm trying to get one PHP file to be able to call from two SQL databases at the same time. How can I do that? Or rather, how can I close a connection being made by SqltoAssoc PDO function so I can start a second one with a completely different SQL database?
Thanks in advanced!
[#4] Gerald Schneider [2013-11-09 08:25:54]
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.
[#5] david at manifestwebdesign dot com [2011-10-27 02:22:13]
The SSL options are silently ignored in PHP 5.3.8, see https://bugs.php.net/bug.php?id=55870
Looks like it's addressed upstream, I just want to save others the hour and a half I just wasted :)
[#6] curt at webmasterbond dot com [2011-04-15 17:54:24]
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'
)
);
?>
[#7] brian at diamondsea dot com [2008-07-25 11:26:51]
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.
[#8] miller_kurt_e at yahoo dot com [2008-07-20 14:03:04]
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.
[#9] rmottey at gmail dot com [2008-01-09 03:51:29]
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);)
<?php
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();
}
?>
[#10] marty at excudo dot net [2007-10-17 05:13:22]
Davey wrote:
> 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()
>
> - Davey
Almost correct. It should be:
PDO::setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);
so, without the quotes.
otherwise it still won't work :)
[#11] konrads dot smelkovs at gmail dot com [2007-07-18 03:39:35]
A note for the eager:
There is no way how to get returned row count from an executed prepared statement without fetching the rows.
[#12] davey at php dot net [2007-06-06 13:46:51]
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()
- Davey
[#13] dibakar at talash dot net [2006-09-11 23:31:46]
PDO is much better option for calling procedures, views or triggers of mysql 5.x versions from PHP instead of using mysqli extension. Following is a simple demo script which can help anybody on how to call and use mysql procedures through php
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
$stmt->execute();
echo "<B>outputting...</B><BR>";
while ($rs = $stmt->fetch(PDO::FETCH_OBJ)) {
echo "output: ".$rs->name."<BR>";
}
echo "<BR><B>".date("r")."</B>";
} catch (PDOException $e) {
print "Error!: " . $e->getMessage() . "<br/>";
die();
}