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The PHP manual text and comments are covered by the Creative Commons Attribution 3.0 License © the PHP Documentation Group - Impressum - mail("TO:Reinhard Neidl",...)
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.
Die folgenden Konstanten werden vom Treiber definiert und sind nur verfügbar, wenn die Extension entweder in PHP einkompiliert oder dynamisch zur Laufzeit geladen wurde. Weiterhin sind diese Konstanten treiberspezifisch und sollten nur mit diesem Treiber benutzt werden. MySQL-spezifische Attribute mit dem PostgreSQL Treiber zu nutzen, kann zu unerwarteten Ergebnissen führen. Kann Ihr Code mit verschiedenen Treibern arbeiten, so können Sie PDO::getAttribute() benutzen, um mit PDO_ATTR_DRIVER_NAME den aktuellen Treiber zu ermitteln.
Beispiel #3 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");
}
?>
Enable LOAD LOCAL INFILE.
Note, this constant can only be used in the driver_options array when constructing a new database handle.
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.
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.
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.
Maximum buffer size. Defaults to 1 MiB. This constant is not supported when compiled against mysqlnd.
Perform direct queries, don't use prepared statements.
Return the number of found (matched) rows, not the number of changed rows.
Permit spaces after function names. Makes all functions names reserved words.
Enable network communication compression. This is not supported when compiled against mysqlnd.
Das Verhalten dieser Funktionen wird durch Einstellungen in der php.ini beeinflusst.
| Name | Default | Changeable |
|---|---|---|
| pdo_mysql.default_socket | "/tmp/mysql.sock" | PHP_INI_SYSTEM |
| pdo_mysql.debug | NULL | PHP_INI_SYSTEM |
Hier eine kurze Erklärung der Konfigurationsoptionen:
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.
Enables debugging for PDO_MYSQL. This setting is only available when PDO_MYSQL is compiled against mysqlnd and in PDO debug mode.
Note that the MySQL option PDO::MYSQL_ATTR_LOCAL_INFILE can only be set during the initial construction of your PDO object.
It is not supported by PDO::getAttribute() nor PDO::setAttribute() for MySQL PDO objects.
This is the way to force mysql PDO driver to use UTF-8 for the connection :
<?php
$pdo = new PDO(
'mysql:host=hostname;dbname=defaultDbName',
'username',
'password',
array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8")
);
?>
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.
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.
On Windows, with Apache, it would not load php_pdo_mysql.dll until I put libmysql.dll in Apache's dll path (e.g. apache/bin)
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!: " . $e->getMessage() . "<br/>";
die();
}
?>
Davey wrote:
> To use "PDO::MYSQL_ATTR_USE_BUFFERED_QUERY" you should call
> PDO::setAttribute("PDO::MYSQL_ATTR_USE_BUFFERED_QUERY", true);
>
>It will not work when passed into PDO::prepare()
>
> - Davey
Almost correct. It should be:
PDO::setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);
so, without the quotes.
otherwise it still won't work :)
> konrads dot smelkovs at gmail dot com
> 18-Jul-2007 03:39
> A note for the eager:
>> There is no way how to get returned row count from an executed prepared statement without fetching the rows.
Sure there is, just do something like this:
if ($sth = $pdo->prepare($sql)) {
$sth->execute($values);
$sth->fetch();
// get count of rows in result set
if ($sth_rc = $this->getDataset()->query('SELECT FOUND_ROWS()')) {
$row_count = $sth_rc->fetchColumn(0);
}
}
A note for the eager:
There is no way how to get returned row count from an executed prepared statement without fetching the rows.
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
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();
}
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