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PHP : Function Reference : MySQL Functions (PDO_MYSQL)

MySQL Functions (PDO_MYSQL)


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.

Predefined Constants

The constants below are defined by this driver, and will only be available when the extension has been either compiled into PHP or dynamically loaded at runtime. In addition, these driver-specific constants should only be used if you are using this driver. Using mysql-specific attributes with the postgres driver may result in unexpected behaviour. PDO::getAttribute() may be used to obtain the PDO_ATTR_DRIVER_NAME attribute to check the driver, if your code can run against multiple drivers.


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 1466. Forcing queries to be buffered in mysql

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




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


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


Read options from the named group from my.cnf or the file specified with MYSQL_READ_DEFAULT_FILE.


Maximum buffer size. Defaults to 1 MiB.


Perform direct queries, don't use prepared statements.

Table of Contents

PDO_MYSQL DSN — Connecting to MySQL databases

Code Examples / Notes » ref.pdo_mysql


Well, if you want to get the number of rows returned by a select statement, select COUNT(1) as count in the columns list.


To use "PDO::MYSQL_ATTR_USE_BUFFERED_QUERY" you should call
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 = $dbh->prepare("CALL getname()");
// call the stored procedure
echo "<B>outputting...</B>
while ($rs = $stmt->fetch(PDO::FETCH_OBJ)) {
echo "output: ".$rs->name."
echo "

} catch (PDOException $e) {
print "Error!: " . $e->getMessage() . "<br/>";


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:
so, without the quotes.
otherwise it still won't work :)

konrads dot smelkovs

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


> 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)) {
   // get count of rows in result set
  if ($sth_rc = $this->getDataset()->query('SELECT FOUND_ROWS()')) {
       $row_count = $sth_rc->fetchColumn(0);

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