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db.php
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db.php
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<?php
/*
Plugin Name: Multi-DB
Plugin URI: https://premium.wpmudev.org/project/multi-db/
Description: Allows you to scale your standard Multisite install to allow for millions of blogs and segment your database across multiple physical servers.
Author: WPMU DEV
Version: 3.2.5
Author URI: http://premium.wpmudev.org/
WDP ID: 1
Extends WordPress DB Class
ORIGINAL CODE FROM:
Justin Vincent (justin@visunet.ie)
http://php.justinvincent.com
*/
// +----------------------------------------------------------------------+
// | Copyright Incsub (http://incsub.com/) |
// +----------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify |
// | it under the terms of the GNU General Public License, version 2, as |
// | published by the Free Software Foundation. |
// | |
// | This program is distributed in the hope that it will be useful, |
// | but WITHOUT ANY WARRANTY; without even the implied warranty of |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
// | GNU General Public License for more details. |
// | |
// | You should have received a copy of the GNU General Public License |
// | along with this program; if not, write to the Free Software |
// | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
// | MA 02110-1301 USA |
// +----------------------------------------------------------------------+
global $wpdb, $table_prefix;
global $original_table_prefix, $db_servers, $global_tables, $vip_blogs, $vip_blogs_datasets, $dc_ips;
$original_table_prefix = $table_prefix;
$db_servers = $global_tables = $vip_blogs = $vip_blogs_datasets = $dc_ips = array();
/**
* Adds database server.
*
* @global array $db_servers
* @param type $ds
* @param type $dc
* @param type $read
* @param type $write
* @param type $host
* @param type $lhost
* @param type $name
* @param type $user
* @param type $password
*/
function add_db_server( $ds, $dc, $read, $write, $host, $lhost, $name, $user, $password ) {
global $db_servers;
$server = compact( 'ds', 'dc', 'read', 'write', 'host', 'name', 'user', 'password' );
if ( !empty( $lhost ) ) {
$server['lhost'] = $lhost;
}
$db_servers[$ds][] = $server;
}
/**
* Adds global database table.
*
* @global type $global_tables
* @param type $table_name
*/
function add_global_table( $table_name ) {
global $global_tables;
$global_tables[$table_name] = $table_name;
}
/**
* Adds vip blog.
*
* @global array $vip_blogs
* @global array $vip_blogs_datasets
* @param type $blog_id
* @param type $dataset
*/
function add_vip_blog( $blog_id, $dataset ) {
global $vip_blogs, $vip_blogs_datasets;
$vip_blogs[] = $blog_id;
$vip_blogs_datasets[$blog_id] = $dataset;
}
/**
* Adds data center ip.
*
* @global type $dc_ips
* @param type $ip
* @param type $dc
*/
function add_dc_ip( $ip, $dc ) {
global $dc_ips;
$dc_ips[$ip] = $dc;
}
// setup the list of known global database tables
add_global_table( 'blogs' );
add_global_table( 'blog_versions' );
add_global_table( 'registration_log' );
add_global_table( 'signups' );
add_global_table( 'site' );
add_global_table( 'sitecategories' );
add_global_table( 'sitemeta' );
add_global_table( 'usermeta' );
add_global_table( 'users' );
add_global_table( 'bp_activity_sitewide' );
add_global_table( 'bp_activity_user_activity' );
add_global_table( 'bp_activity_user_activity_cached' );
add_global_table( 'bp_friends' );
add_global_table( 'bp_groups' );
add_global_table( 'bp_groups_groupmeta' );
add_global_table( 'bp_groups_members' );
add_global_table( 'bp_groups_wire' );
add_global_table( 'bp_messages_messages' );
add_global_table( 'bp_messages_notices' );
add_global_table( 'bp_messages_notices' );
add_global_table( 'bp_messages_recipients' );
add_global_table( 'bp_messages_threads' );
add_global_table( 'bp_messages_threads' );
add_global_table( 'bp_notifications' );
add_global_table( 'bp_user_blogs' );
add_global_table( 'bp_user_blogs_blogmeta' );
add_global_table( 'bp_user_blogs_comments' );
add_global_table( 'bp_user_blogs_posts' );
add_global_table( 'bp_xprofile_data' );
add_global_table( 'bp_xprofile_fields' );
add_global_table( 'bp_xprofile_groups' );
add_global_table( 'bp_xprofile_wire' );
add_global_table( 'bp_activity' );
add_global_table( 'bp_activity_meta' );
require_once WP_CONTENT_DIR . '/db-config.php';
if ( !defined( 'DATACENTER' ) ) {
foreach ( $dc_ips as $dc_ip => $dc ) {
if ( substr( $_SERVER['SERVER_ADDR'], 0, strlen( $dc_ip ) ) == $dc_ip ) {
define( 'DATACENTER', $dc );
break;
}
}
}
if ( file_exists( WP_CONTENT_DIR . '/db-list.php' ) ) {
require_once WP_CONTENT_DIR . '/db-list.php';
}
// To allow extending of database class
$wpdb = 'we-need-to-pre-populate-this-variable';
require_once ABSPATH . WPINC . '/wp-db.php';
if ( !defined( 'MULTI_DB_VERSION' ) ) define( 'MULTI_DB_VERSION', '3.2.2' );
if ( !defined( 'WP_USE_MULTIPLE_DB' ) ) define( 'WP_USE_MULTIPLE_DB', false );
if ( !defined( 'DB_SCALING' ) ) define( 'DB_SCALING', '16' );
if ( !defined( 'EZSQL_VERSION' ) ) define( 'EZSQL_VERSION', 'WP1.25' );
if ( !defined( 'OBJECT' ) ) define( 'OBJECT', 'OBJECT', true );
if ( !defined( 'OBJECT_K' ) ) define( 'OBJECT_K', 'OBJECT_K', false );
if ( !defined( 'ARRAY_A' ) ) define( 'ARRAY_A', 'ARRAY_A', false );
if ( !defined( 'ARRAY_N' ) ) define( 'ARRAY_N', 'ARRAY_N', false );
/**
* Multi-DB database access abstraction class.
*/
class m_wpdb extends wpdb {
/**
* The array of open connections.
*
* @access protected
* @var array
*/
var $dbh_connections = array();
/**
* The maximum number of open connections.
*
* @access protected
* @var type
*/
var $max_connections = 10;
/**
* Current database handle
*
* @access protected
* @var resource
*/
var $dbh;
/**
* Global database handle
*
* @access protected
* @var resource
*/
var $dbhglobal;
/**
* The array containing the last query data received from analyze_query method.
*
* @access protected
* @var array
*/
protected $_last_query_data;
/**
* Connects to the database server and selects a database
*
* @access public
* @param string $dbuser MySQL database user
* @param string $dbpassword MySQL database password
* @param string $dbname MySQL database name
* @param string $dbhost MySQL database host
*/
public function __construct( $dbuser, $dbpassword, $dbname, $dbhost ) {
register_shutdown_function( array( $this, '__destruct' ) );
if ( WP_DEBUG && WP_DEBUG_DISPLAY ) {
$this->show_errors();
}
$this->init_charset();
$this->dbuser = $dbuser;
$this->dbpassword = $dbpassword;
$this->dbname = $dbname;
$this->dbhost = $dbhost;
// Try to connect to the database
$global = $this->_get_global_read();
$this->dbhglobal = @mysql_connect( $global['host'], $global['user'], $global['password'], true );
$this->dbh = @mysql_connect( $global['host'], $global['user'], $global['password'], true );
if ( !$this->dbhglobal ) {
$this->_bail_db_connection_error();
}
$this->set_charset( $this->dbhglobal );
$this->ready = true;
$this->select( $global['name'], $this->dbhglobal );
}
/**
* Wraps database connection error in a nice header and footer and dies.
* Will not die if wpdb::$show_errors is false.
*
* @access private
* @return false|void
*/
private function _bail_db_connection_error() {
return $this->bail( sprintf( /*WP_I18N_DB_CONN_ERROR*/"
<h1>Error finding a global database</h1>
<p>This either means that the username and password information in your <code>db-config.php</code> file is incorrect, you haven't declared a global database or we can't contact the global database server. This could mean your host's database server is down.</p>
<ul>
<li>Are you sure you have the correct username and password?</li>
<li>Are you sure that you have typed the correct hostname?</li>
<li>Are you sure that the database server is running?</li>
</ul>
<p>If you're unsure what these terms mean you should probably contact your host. If you still need help you can always visit the <a href='http://wordpress.org/support/'>WordPress Support Forums</a>.</p>
"/*/WP_I18N_DB_CONN_ERROR*/ ), 'db_connect_fail' );
}
/**
* Returns global database information
*
* @access private
* @global array $db_servers The array of databases.
* @return boolean|array The global database information on success, otherwise FALSE.
*/
private function _get_global_read() {
global $db_servers;
if ( is_array( $db_servers['global'] ) ) {
if ( count( $db_servers['global'] ) > 1 ) {
$dc = defined( 'DATACENTER' ) ? DATACENTER : false;
foreach ( $db_servers['global'] as $global ) {
if ( $global['dc'] == $dc && $global['read'] > 0 ) {
return $global;
}
}
// If still here we can't find a local readable global database so return first readable one
foreach ( $db_servers['global'] as $global ) {
if ( $global['read'] > 0 ) {
return $global;
}
}
// Nope, none of those either so exit.
return false;
} else {
return $db_servers['global'][0];
}
}
return false;
}
/**
* Real escapes, using mysql_real_escape_string() or addslashes()
*
* @see mysql_real_escape_string()
* @see addslashes()
*
* @access private
* @param string $string The string to escape.
* @return string Escaped string.
*/
function _real_escape( $string ) {
if ( is_resource( $this->dbhglobal ) )
return mysql_real_escape_string( $string, $this->dbhglobal );
else
return addslashes( $string );
}
/**
* Returns global database version number.
*
* @access public
* @return false|string The version number on success, otherwise FALSE.
*/
public function db_version() {
return is_resource( $this->dbhglobal )
? preg_replace( '/[^0-9.].*/', '', @mysql_get_server_info( $this->dbhglobal ) )
: false;
}
/**
* Returns all tables available in the database.
*
* @filter tables_to_repair
*
* @access public
* @param array $tables The initial array of tables.
* @return array The array of database tables.
*/
public function get_all_tables( $tables ) {
$blogs_ids = $this->get_col( "SELECT blog_id FROM {$this->base_prefix}blogs WHERE deleted = 0 AND spam = 0 AND archived = '0'" );
foreach ( $blogs_ids as $blog_id ) {
$new_tables = $this->get_col( "SHOW TABLES LIKE '{$this->base_prefix}{$blog_id}_%';" );
if ( $new_tables && is_array( $new_tables ) && count( $new_tables ) > 0 ) {
$tables = array_merge( $tables, $new_tables );
}
}
return $tables;
}
/**
* Connects to database based on incoming query.
*
* @access public
* @param string $query The query which will be executed.
* @return boolean|resource The database connection resource on success, otherwise FALSE.
*/
public function db_connect( $query = 'SELECT 1' ) {
if ( empty( $query ) ) {
return false;
}
$dbh = false;
$this->_last_query_data = $query_data = $this->analyze_query( $query );
$this->last_table = $query_data['table_name'];
$this->last_db_used = $query_data['query_type'];
$operation = $query_data['query_type'] == 'write' ? 'write' : 'read';
// Return a global read database as if already have it connected
if ( $operation == 'read' && $query_data['dataset'] == 'global' && is_resource( $this->dbhglobal ) ) {
return $this->dbhglobal;
}
if ( $query_data['query_type'] == 'write' && defined( 'MASTER_DB_DEAD' ) ) {
die( "We're updating the database, please try back in 5 minutes. If you are posting to your blog please hit the refresh button on your browser in a few minutes to post the data again. It will be posted as soon as the database is back online again." );
}
// check if we're already connected.
$dataset_key = "{$query_data['dataset']}.{$operation}";
if ( isset( $this->dbh_connections[$dataset_key] ) && is_resource( $this->dbh_connections[$dataset_key]['connection'] ) ) {
return $this->dbh_connections[$dataset_key]['connection'];
}
foreach ( self::_get_servers( $query_data['dataset'], $operation ) as $server ) {
if ( ( $dbh = $this->_connect_to_server( $server, $query_data['dataset'], $operation ) ) ) {
return $dbh;
}
}
$this->_bail_db_connection_error();
return false;
}
/**
* Closes MySQL connection to a database.
*
* @access public
* @param string $dbhname The database name to close connection to.
*/
public function disconnect( $dbhname ) {
if ( isset( $this->dbh_connections[$dbhname]['connection'] ) && is_resource( $this->dbh_connections[$dbhname]['connection'] ) ) {
@mysql_close( $this->dbh_connections[$dbhname]['connection'] );
unset( $this->dbh_connections[$dbhname] );
}
}
/**
* Sanitizes select query's table names by adding database prefixes.
*
* This function solves the issue when we have JOINs in a select query,
* which connects global tables from global database. For instance:
*
* SELECT * FROM {$wpdb->posts} AS p LEFT JOIN {$wpdb->users} AS u ON u.ID = p.post_author WHERE p.ID = 2;
*
* @since 3.1.2
* @filter query
*
* @access public
* @global array $global_tables The array of globals tables.
* @param string $query The initial query.
* @return string Sanitized query.
*/
public function sanitize_multidb_query_tables( $query ) {
global $global_tables;
// look through all local tables and add blog database prefix if it has been found
if ( $this->blogid > 1 ) {
// add whitespace at the end of the query to make our patterns working properly
$query = trim( $query ) . ' ';
$blog_database = self::_get_servers( self::_get_blog_dataset( $this->blogid ), 'read' );
if ( empty( $blog_database ) ) {
return $query;
}
$global = $this->_get_global_read();
//if not on same physical mysql server, and same username, we can't do joins
if ( $global[0]['host'] != $blog_database[0]['host'] || $global[0]['user'] != $blog_database[0]['user']) {
return $query;
}
// don't touch non select queries.
if ( !preg_match( '/^SELECT\s+/is', $query ) ) {
return $query;
}
$global_prefix = isset( $this->base_prefix ) ? $this->base_prefix : $this->prefix;
// look through all global tables and add global database prefix if it has been found
foreach ( $global_tables as $table ) {
$query = preg_replace( "/\s{$global_prefix}{$table}(\s|\.|,)/", " {$global['name']}.{$global_prefix}{$table}$1", $query );
}
$blog_database = $blog_database[0]['name'];
$query = preg_replace( "/\s{$this->prefix}(.*?)(\s|\.|,|\()/", " {$blog_database}.{$this->prefix}$1$2", $query );
}
return trim( $query );
}
/**
* Performs a MySQL database query, using current database connection.
*
* @access public
* @param string $query Database query to execute.
* @return int|false Number of rows affected/selected or false on error
*/
public function query( $query ) {
if ( !$this->ready ) {
return false;
}
// some queries are made before the plugins have been loaded, and thus cannot be filtered with this method
if ( function_exists( 'apply_filters' ) ) {
$query = apply_filters( 'query', $query );
}
$return_val = 0;
$this->flush();
// use $this->dbh for read ops, and $this->dbhwrite for write ops
// use $this->dbhglobal for gloal table ops
//unset( $dbh );
// Test the global is set and if not then set it
$dbh = $this->db_connect( $query );
if ( !is_resource( $dbh ) ) {
$this->_bail_db_connection_error();
return false;
}
// Log how the function was called
$this->func_call = '$db->query("' . $query . '")';
// Keep track of the last query for debug..
$this->last_query = $query;
if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) {
$this->timer_start();
}
$this->result = @mysql_query( $query, $dbh );
$this->num_queries++;
if ( defined( 'SAVEQUERIES' ) && SAVEQUERIES ) {
$this->queries[] = array( $query, $this->timer_stop(), $this->get_caller() );
}
// If there is an error then take note of it..
if ( is_resource( $dbh ) && ( $this->last_error = mysql_error( $dbh ) ) ) {
$this->print_error( $this->last_error );
return false;
}
if ( preg_match( "/^\\s*(insert|delete|update|replace|alter) /i", $query ) ) {
$this->rows_affected = mysql_affected_rows( $dbh );
// Take note of the insert_id
if ( preg_match( "/^\\s*(insert|replace) /i", $query ) ) {
$this->insert_id = mysql_insert_id( $dbh );
}
// Return number of rows affected
$return_val = $this->rows_affected;
} else {
$i = 0;
while ( $i < @mysql_num_fields( $this->result ) ) {
$this->col_info[$i] = @mysql_fetch_field( $this->result );
$i++;
}
$num_rows = 0;
while ( $row = @mysql_fetch_object( $this->result ) ) {
$this->last_result[$num_rows] = $row;
$num_rows++;
}
@mysql_free_result( $this->result );
// Log number of rows the query returned and return number of rows selected
$this->num_rows = $num_rows;
$return_val = $num_rows;
}
return $return_val;
}
/**
* Returns connection information based on incoming query.
*
* @access public
* @global type $original_table_prefix
* @global type $global_tables
* @param string $query The query string to analyze.
* @return array The connection information array.
*/
public function analyze_query( $query ) {
global $original_table_prefix, $global_tables;
// trim query
$query = rtrim( trim( $query ), ';' );
// Set initial force local stuff.
$forcelocal = false;
$maybe = $return = array();
$table_name = 'unknown';
if ( preg_match( '/^SELECT.*?\s+FROM\s+`?([0-9,a-z,A-Z$_\.]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^UPDATE IGNORE\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^UPDATE\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^INSERT.*?\s+INTO\s+`?([0-9,a-z,A-Z$_]+)`?[\(\s]/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^REPLACE.*?\s+INTO\s+`?([0-9,a-z,A-Z$_]+)`?[\(\s]/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^DELETE.*?\s+FROM\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^(?:TRUNCATE|RENAME|OPTIMIZE|LOCK|UNLOCK)\s+TABLE\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^(?:TRUNCATE|RENAME|OPTIMIZE|LOCK|UNLOCK)\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^SHOW TABLE STATUS (LIKE|FROM) \'?`?([0-9,a-z,A-Z$_]+)\'?`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^SHOW TABLES LIKE \'?`?([0-9,a-z,A-Z$_]+)\'?`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^SHOW TABLES/is', $query, $maybe ) ) {
$forcelocal = true;
} else if ( preg_match( '/^SHOW INDEX FROM `?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^SHOW\s+\w*\s*COLUMNS (?:FROM|IN) `?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^CREATE\s+TABLE\s+IF\s+NOT\s+EXISTS\s+`?([0-9,a-z,A-Z$_]+)`?\s+/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^SHOW CREATE TABLE `?([0-9,a-z,A-Z$_]+?)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^CREATE\s+TABLE\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^DROP\s+TABLE\s+IF\s+EXISTS\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^DROP\s+TABLE\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^DESCRIBE\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^ALTER\s+TABLE\s+`?([0-9,a-z,A-Z$_]+)`?\s+/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^CHECK\s+TABLE\s+?([0-9,a-z,A-Z$_]+)?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else if ( preg_match( '/^ANALYZE\s+TABLE\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query, $maybe ) ) {
$table_name = $maybe[1];
} else {
$select_without_from = preg_match( '/^SELECT\s+/is', $query ) && !preg_match( '/^SELECT.*?\s+FROM\s+`?([0-9,a-z,A-Z$_]+)`?\s*/is', $query );
$transaction_stuff = preg_match( '/^(START TRANSACTION|BEGIN|COMMIT|ROLLBACK)/is', $query );
$set = preg_match( '/^SET\s+/is', $query );
if ( $select_without_from || $transaction_stuff || $set ) {
if ( $this->_last_query_data ) {
return $this->_last_query_data;
}
}
}
$table_name = explode( '.', $table_name );
$table_name = array_pop( $table_name );
// determine whether global or blog table type is
$blog_id = false;
if ( $forcelocal == true ) {
$table_type = 'blog';
$blog_id = $this->blogid;
} else {
$base_table_name = substr( $table_name, strlen( $original_table_prefix ) );
if ( in_array( $base_table_name, $global_tables ) ) {
// This is a global table
$table_type = 'global';
$blog_id = 'global';
} else {
// Should be a blog related table
$table_type = 'blog';
$base_match = array();
if ( preg_match( "|^[0-9]{1,20}_?|", $base_table_name, $base_match ) && isset( $base_match[0] ) ) {
$base_table_name = str_replace( $base_match[0], '', $base_table_name );
}
if ( preg_match( "|^{$original_table_prefix}([0-9]{1,20})_?{$base_table_name}|", $table_name, $match ) ) {
$blog_id = absint( $match[1] );
}
}
}
$query_type = 'read';
$patterns = array(
'/^UPDATE/is',
'/^INSERT/is',
'/^REPLACE/is',
'/^DELETE/is',
'/^OPTIMIZE/is',
'/^SHOW\s+TABLE\s+STATUS/is',
'/^CREATE\s+TABLE/is',
'/^TRUNCATE\s+TABLE/is',
'/^SHOW\s+CREATE\s+TABLE/is',
'/^DROP\s+TABLE/is',
'/^ALTER\s+TABLE/is',
'/^RENAME\s+TABLE/i',
);
foreach ( $patterns as $pattern ) {
if ( preg_match( $pattern, $query ) ) {
$query_type = 'write';
break;
}
}
// dataset
if ( $table_type == 'global' ) {
$dataset = 'global';
} elseif ( $table_type == 'blog' ) {
// check if the blog_id is set.
if ( empty( $blog_id ) ) {
// we are on a multi-site blog without a number, or we have an unidentified global table
$blog_id = 'global';
$dataset = 'global';
} else {
$dataset = self::_get_blog_dataset( $blog_id );
}
}
$return['table_name'] = $table_name;
$return['table_type'] = $table_type;
$return['blog_id'] = $blog_id;
$return['query_type'] = $query_type;
$return['dataset'] = $dataset;
return $return;
}
/**
* Returns blog dataset.
*
* @since 3.2.0
*
* @static
* @access protected
* @param int $blog_id The blog ID.
* @return string The dataset string.
*/
protected static function _get_blog_dataset( $blog_id ) {
global $vip_blogs_datasets;
//check if this is a VIP blog
if ( isset( $vip_blogs_datasets[ $blog_id ] ) ) {
return $vip_blogs_datasets[ $blog_id ];
}
$hash_value = md5( $blog_id );
if ( defined( 'DB_SCALING' ) ) {
if ( DB_SCALING == 4096 ) {
return substr( $hash_value, 0, 3 );
} elseif ( DB_SCALING == 256 ) {
return substr( $hash_value, 0, 2 );
}
}
return substr( $hash_value, 0, 1 );
}
/**
* Returns the array of appropriate servers to connect to.
*
* @since 3.2.0
*
* @static
* @access protected
* @global array $db_servers The array of database servers.
* @param string $dataset The current dataset to use.
* @param string $operation The operation type (read/write).
* @return array The array of servers to connect to.
*/
protected static function _get_servers( $dataset, $operation ) {
global $db_servers;
$dc = defined( 'DATACENTER' ) ? DATACENTER : false;
// Group eligible servers by R (plus 10,000 if remote)
$server_groups = array();
if ( isset( $db_servers[$dataset] ) ) {
foreach ( $db_servers[$dataset] as $server ) {
if ( $server[$operation] ) {
// Add a penality to those dbs not in our datacenter
if ( $server['dc'] != $dc ) {
$server[$operation] += 10000;
}
// Try the local hostname first when connecting within the DC
if ( $server['dc'] == $dc ) {
$lserver = $server;
if ( isset( $lserver['lhost'] ) ) {
$lserver['host'] = $lserver['lhost'];
}
$priority = $server[$operation] - 0.5;
$server_groups["{$priority}"][] = $lserver;
}
$priority = $server[$operation];
$server_groups["{$priority}"][] = $server;
}
}
}
// Randomize each group and add its members to
$servers = array();
ksort( $server_groups );
foreach ( $server_groups as $group ) {
if ( count( $group ) > 1 ) {
shuffle( $group );
}
$servers = array_merge( $servers, $group );
}
return $servers;
}
/**
* Connects to the server.
*
* @since 3.2.0
*
* @access protected
* @param array $server The server configuration info.
* @param string $dataset The current dataset to use.
* @param string $operation The operation type (read/write).
* @return resource|boolean The MySQL connection on success, otherwise FALSE.
*/
protected function _connect_to_server( $server, $dataset, $operation ) {
$dbh = @mysql_connect( $server['host'], $server['user'], $server['password'], true );
if ( !is_resource( $dbh ) ) {
return false;
}
$this->set_charset( $dbh );
$this->select( $server['name'], $dbh );
// save connection
$this->dbh_connections["{$dataset}.{$operation}"] = array(
'connection' => $dbh,
'name' => $server['name'],
'ds' => $server['ds'],
'dc' => $server['dc'],
'read' => $server['read'],
'write' => $server['write'],
'host' => $server['host'],
'user' => $server['user'],
'password' => $server['password'],
'lhost' => isset( $server['lhost'] ) ? $server['lhost'] : '',
);
// disconnect old connection if total number of connections more then allowed one
while ( $this->max_connections > 0 && count( $this->dbh_connections ) > $this->max_connections ) {
reset( $this->dbh_connections );
$this->disconnect( key( $this->dbh_connections ) );
}
return $dbh;
}
}
// redefine database connection class
$wpdb = new m_wpdb( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );
add_filter( 'tables_to_repair', array( $wpdb, 'get_all_tables' ) );
//add_filter( 'query', array( $wpdb, 'sanitize_multidb_query_tables' ) );