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Database: Fall back from ext/mysqli to ext/mysql if the connection fails.

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This allows us to avoid breaking a site that works under ext/mysql but is misconfigured for ext/mysqli.

props pento.
see #21663.


git-svn-id: https://develop.svn.wordpress.org/trunk@27935 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Andrew Nacin 2014-04-03 21:57:22 +00:00
parent 641f9f9a93
commit ccb4f3714a
1 changed files with 30 additions and 0 deletions
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30
src/wp-includes/wp-db.php
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@ -548,6 +548,15 @@ class wpdb {
*/
private $use_mysqli = false;
/**
* Whether we've managed to successfully connect at some point
*
* @since 3.9.0
* @access private
* @var bool
*/
private $has_connected = false;
/**
* Connects to the database server and selects a database
*
@ -1336,6 +1345,26 @@ class wpdb {
if ( $this->dbh->connect_errno ) {
$this->dbh = null;
/* It's possible ext/mysqli is misconfigured. Fall back to ext/mysql if:
* - We haven't previously connected, and
* - USE_EXT_MYSQL isn't set to false, and
* - ext/mysql is loaded.
*/
$attempt_fallback = true;
if ( $this->has_connected ) {
$attempt_fallback = false;
} else if ( defined( 'USE_EXT_MYSQL' ) && ! USE_EXT_MYSQL ) {
$attempt_fallback = false;
} else if ( ! function_exists( 'mysql_connect' ) ) {
$attempt_fallback = false;
}
if ( $attempt_fallback ) {
$this->use_mysqli = false;
$this->db_connect();
}
}
} else {
if ( WP_DEBUG ) {
@ -1367,6 +1396,7 @@ class wpdb {
return false;
} else if ( $this->dbh ) {
$this->has_connected = true;
$this->set_charset( $this->dbh );
$this->set_sql_mode();
$this->ready = true;