PDO_MYSQL DSN

(PECL PDO_MYSQL >= 0.1.0)

PDO_MYSQL DSN — Connecting to MySQL databases

Description

The PDO_MYSQL Data Source Name (DSN) is composed of the following elements:

DSN prefix: The DSN prefix is mysql: .
host: The hostname on which the database server resides.
port: The port number where the database server is listening.
dbname: The name of the database.
unix_socket: The MySQL Unix socket (shouldn't be used with host or port).

Examples

Example #1 PDO_MYSQL DSN examples

The following example shows a PDO_MYSQL DSN for connecting to MySQL databases:

mysql:host=localhost;dbname=testdb

More complete examples:

mysql:host=localhost;port=3307;dbname=testdb
mysql:unix_socket=/tmp/mysql.sock;dbname=testdb

Oracle (PDO)

MySQL (PDO)

Last updated: Fri, 12 Mar 2010

add a note User Contributed Notes
PDO_MYSQL DSN

rustamabd at gmail dot com
15-Mar-2009 08:18


Even though pdo_mysql accepts an additional "charset" parameter in the DSN (see mysql_driver.c:442), as of PHP 5.2.9 it does not do anything with it.



A possible workaround to set the charset to UTF-8, for example, could be:

<?php



    $dbh = new PDO("mysql:$connstr",  $user, $password);



    $dbh -> exec("set names utf8");



?>

codeslinger at compsalot dot com
11-Mar-2009 03:07


Here is a function that provides a generic interface to connect


 to a mySQL PDO.  This takes care of the default values automatically 


and deals with the difference between a host name and a socket path.





The advantage of using LOCALHOST for the default is that you don't have


 to worry about IPv4 vs IPv6.  But keep in mind that mySQL login security 


does not treat the name as being interchangeable with the ip address.  


You could of course change the default to use a socket path instead.





Enjoy!


Codeslinger





P.S. This form forces you to limit the length of your lines, so I had to


split a couple of things.





<?php





//pppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp


//


//  Creates a new mySQL database connection


//


//  Returns a PDO object or an error message  


//  Use: is_object()  to verify the result


//


//


//  If $DBHost starts with a '/' then it is treated as a Socket


//


//  if $DBHost is empty it will default to LOCALHOST which is NOT the 


//  same as 127.0.0.1


//


//  $DBPort is optional and will use the standard mySQL default if not 


//  specified


//


//  The database name ($DBName) is optional, but if it is specified 


//  it must exist or an error results


//


//  2009-03-11  Created: by codeslinger at compsalot.com


//


//          Released to the Public Domain free to use and modify


//


//


function dbPDO_Connect_mySQL($DBUser, $DBPass, $DBName = false, 


                            $DBHost = false, $DBPort = false)


{





    $DBNameEq = empty($DBName) ? '' : ";dbname=$DBName";


    


    if (empty($DBHost)) $DBHost = 'localhost';


    


    If ($DBHost[0] === '/')


    {


        $Connection = "unix_socket=$DBHost";


    }


    else


    {


        if (empty($DBPort)) $DBPort = 3306;


        $Connection = "host=$DBHost;port=$DBPort";


    }


    


    //======================


    


    try


    {


        $dbh     = new PDO("mysql:$Connection$DBNameEq"


                                  ,  $DBUser, $DBPass);


    }


    catch (PDOException $e)


    {


        return $e->getMessage();


    }





    return $dbh;


}





//================================


//================================


//


//Example of use:





  //connects to the default (localhost)





  $dbh = dbPDO_Connect_mySQL('user', 'password', 'database');





  //............................................................


  //error handler goes here





  if (!is_object($dbh)) trigger_error("Failed to connect to 'database' "


       ." | Error = $dbh", E_USER_ERROR);





  //............................................................


  //get a record





  $sql = "select * from SomeTable limit 1;";


    


  $dbRS = $dbh->query($sql);


  $row = empty($dbRS) ? false : $dbRS->fetch(PDO::FETCH_ASSOC);


  if (!empty($dbRS)) $dbRS->closeCursor();





  //............................................................


  //do something with the data





  if (!empty($row)) print_r($row);    


  else echo "Error? no data found\n";





?>

codeslinger at compsalot dot com
11-Mar-2009 11:00


I have tested this and found that the "dbname" field is optional.  Which is a good thing if you must first create the db.



After creating a db be sure to exec a "use dbname;"  command, or else use fully specified table references.

add a note

Oracle (PDO)

MySQL (PDO)

Last updated: Fri, 12 Mar 2010