Last updated: Fri, 22 Aug 2008

MySQL Functions (PDO_MYSQL)

Wstęp

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.

Ostrzeżenie

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.

Stałe predefiniowane

Poniższe stałe są definiowane przez ten sterownik, i będą dostępne tylko kiedy to rozszerzenie będzie skompilowane z PHP lub załadowane dynamicznie przy starcie. Dodatkowo, te specyficzne dla sterownika stałe powinny być używane tylko przy użyciu tego konkretnego sterownika. Używanie atrybutów bazy MySQL przy użyciu sterownika PostgreSQL może prowadzić do nieprzewidzianego zachowania. Jeśli skrypt korzysta z wielu sterowników, do pobrania atrybutu PDO_ATTR_DRIVER_NAME, zawierającego nazwę sterownika, można zastosować funkcję PDO::getAttribute().

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.

PDO::MYSQL_ATTR_INIT_COMMAND (integer)

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

PDO::MYSQL_ATTR_READ_DEFAULT_FILE (integer)

Read options from the named option file instead of from my.cnf.

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.

PDO::MYSQL_ATTR_MAX_BUFFER_SIZE (integer)

Maximum buffer size. Defaults to 1 MiB.

PDO::MYSQL_ATTR_DIRECT_QUERY (integer)

Perform direct queries, don't use prepared statements.

Spis treści

PDO_MYSQL DSN — Connecting to MySQL databases

PDO_MYSQL DSN

PDO_INFORMIX DSN

Last updated: Fri, 22 Aug 2008

add a note User Contributed Notes
MySQL (PDO)

brian at diamondsea dot com
25-Jul-2008 08:26


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.

miller_kurt_e at yahoo dot com
20-Jul-2008 11:03


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.

practicegoodtheory at gmail dot com
19-Jun-2008 08:56


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)

rmottey at gmail dot com
09-Jan-2008 12:51


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();

    }

?>

marty at excudo dot net
17-Oct-2007 02:13


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 :)

bratwizard at yahoo dot com
22-Sep-2007 09:59


> 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);

        }

    }

konrads dot smelkovs at gmail dot com
18-Jul-2007 12:39


A note for the eager:

There is no way how to get returned row count from an executed prepared statement without fetching the rows.

davey at php dot net
06-Jun-2007 10:46


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

dibakar at talash dot net
12-Sep-2006 08:31


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();

    }

add a note

PDO_MYSQL DSN

PDO_INFORMIX DSN

Last updated: Fri, 22 Aug 2008