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krtmn/includes/class-mysql.php

139 lines
3.8 KiB
PHP
Executable File

<?php
/**
* Pick the right DB class and return an instance
*
* @since 1.7
* @param string $extension Optional: user defined choice
* @return class $ydb DB class instance
*/
function yourls_set_DB_driver( ) {
// Auto-pick the driver. Priority: user defined, then PDO, then mysqli, then mysql
if ( defined( 'YOURLS_DB_DRIVER' ) ) {
$driver = strtolower( YOURLS_DB_DRIVER ); // accept 'MySQL', 'mySQL', etc
} elseif ( extension_loaded( 'pdo_mysql' ) ) {
$driver = 'pdo';
} elseif ( extension_loaded( 'mysqli' ) ) {
$driver = 'mysqli';
} elseif ( extension_loaded( 'mysql' ) ) {
$driver = 'mysql';
} else {
$driver = '';
}
// Set the new driver
if ( in_array( $driver, array( 'mysql', 'mysqli', 'pdo' ) ) ) {
$class = yourls_require_db_files( $driver );
}
global $ydb;
if ( !class_exists( $class, false ) ) {
$ydb = new stdClass();
yourls_die(
yourls__( 'YOURLS requires the mysql, mysqli or pdo_mysql PHP extension. No extension found. Check your server config, or contact your host.' ),
yourls__( 'Fatal error' ),
503
);
}
yourls_do_action( 'set_DB_driver', $driver );
$ydb = new $class( YOURLS_DB_USER, YOURLS_DB_PASS, YOURLS_DB_NAME, YOURLS_DB_HOST );
$ydb->DB_driver = $driver;
yourls_debug_log( "DB driver: $driver" );
}
/**
* Load required DB class files
*
* This goes in its own function to allow easier unit tests
*
* @since 1.7.1
* @param string $driver DB driver
* @return string name of the DB class to instantiate
*/
function yourls_require_db_files( $driver ) {
require_once( YOURLS_INC . '/ezSQL/ez_sql_core.php' );
require_once( YOURLS_INC . '/ezSQL/ez_sql_core_yourls.php' );
require_once( YOURLS_INC . '/ezSQL/ez_sql_' . $driver . '.php' );
require_once( YOURLS_INC . '/ezSQL/ez_sql_' . $driver . '_yourls.php' );
return 'ezSQL_' . $driver . '_yourls';
}
/**
* Connect to DB
*
* @since 1.0
*/
function yourls_db_connect() {
global $ydb;
if ( !defined( 'YOURLS_DB_USER' )
or !defined( 'YOURLS_DB_PASS' )
or !defined( 'YOURLS_DB_NAME' )
or !defined( 'YOURLS_DB_HOST' )
) yourls_die ( yourls__( 'Incorrect DB config, or could not connect to DB' ), yourls__( 'Fatal error' ), 503 );
// Are we standalone or in the WordPress environment?
if ( class_exists( 'wpdb', false ) ) {
/* TODO: should we deprecate this? Follow WP dev in that area */
$ydb = new wpdb( YOURLS_DB_USER, YOURLS_DB_PASS, YOURLS_DB_NAME, YOURLS_DB_HOST );
} else {
yourls_set_DB_driver();
}
return $ydb;
}
/**
* Return true if DB server is responding
*
* This function is supposed to be called right after yourls_get_all_options() has fired. It is not designed (yet) to
* check for a responding server after several successful operation to check if the server has gone MIA
*
* @since 1.7.1
*/
function yourls_is_db_alive() {
global $ydb;
$alive = false;
switch( $ydb->DB_driver ) {
case 'pdo' :
$alive = isset( $ydb->dbh );
break;
case 'mysql' :
$alive = ( isset( $ydb->dbh ) && false !== $ydb->dbh );
break;
case 'mysqli' :
$alive = ( null == mysqli_connect_error() );
break;
// Custom DB driver & class : delegate check
default:
$alive = yourls_apply_filter( 'is_db_alive_custom', false );
}
return $alive;
}
/**
* Die with a DB error message
*
* @TODO in version 1.8 : use a new localized string, specific to the problem (ie: "DB is dead")
*
* @since 1.7.1
*/
function yourls_db_dead() {
// Use any /user/db_error.php file
if( file_exists( YOURLS_USERDIR . '/db_error.php' ) ) {
include_once( YOURLS_USERDIR . '/db_error.php' );
die();
}
yourls_die( yourls__( 'Incorrect DB config, or could not connect to DB' ), yourls__( 'Fatal error' ), 503 );
}