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<?php
// HyperDB
// This file should be installed at ABSPATH/wp-content/db.php
/** Load the wpdb class while preventing instantiation **/
$wpdb = true;
if ( defined('WPDB_PATH') )
require_once(WPDB_PATH);
else
require_once( ABSPATH . WPINC . '/wp-db.php' );
if ( defined('DB_CONFIG_FILE') && file_exists( DB_CONFIG_FILE ) ) {
/** The config file was defined earlier. **/
} elseif ( file_exists( ABSPATH . 'db-config.php') ) {
/** The config file resides in ABSPATH. **/
define( 'DB_CONFIG_FILE', ABSPATH . 'db-config.php' );
} elseif ( file_exists( dirname(ABSPATH) . '/db-config.php' ) && ! file_exists( dirname(ABSPATH) . '/wp-settings.php' ) ) {
/** The config file resides one level above ABSPATH but is not part of another install. **/
define( 'DB_CONFIG_FILE', dirname(ABSPATH) . '/db-config.php' );
} else {
/** Lacking a config file, revert to the standard database class. **/
$wpdb = new wpdb( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );
return;
}
/**
* Common definitions
*/
define( 'HYPERDB_LAG_OK', 1 );
define( 'HYPERDB_LAG_BEHIND', 2 );
define( 'HYPERDB_LAG_UNKNOWN', 3 );
class hyperdb extends wpdb {
/**
* The last table that was queried
* @var string
*/
var $last_table;
/**
* After any SQL_CALC_FOUND_ROWS query, the query "SELECT FOUND_ROWS()"
* is sent and the mysql result resource stored here. The next query
* for FOUND_ROWS() will retrieve this. We do this to prevent any
* intervening queries from making FOUND_ROWS() inaccessible. You may
* prevent this by adding "NO_SELECT_FOUND_ROWS" in a comment.
* @var resource
*/
var $last_found_rows_result;
/**
* Whether to store queries in an array. Useful for debugging and profiling.
* @var bool
*/
var $save_queries = false;
/**
* The current mysql link resource
* @var resource
*/
var $dbh;
/**
* Associative array (dbhname => dbh) for established mysql connections
* @var array
*/
var $dbhs;
/**
* The multi-dimensional array of datasets and servers
* @var array
*/
var $hyper_servers = array();
/**
* Optional directory of tables and their datasets
* @var array
*/
var $hyper_tables = array();
/**
* Optional directory of callbacks to determine datasets from queries
* @var array
*/
var $hyper_callbacks = array();
/**
* Custom callback to save debug info in $this->queries
* @var callable
*/
var $save_query_callback = null;
/**
* Whether to use mysql_pconnect instead of mysql_connect
* @var bool
*/
var $persistent = false;
/**
* The maximum number of db links to keep open. The least-recently used
* link will be closed when the number of links exceeds this.
* @var int
*/
var $max_connections = 10;
/**
* Whether to check with fsockopen prior to mysql_connect.
* @var bool
*/
var $check_tcp_responsiveness = true;
/**
* Minimum number of connections to try before bailing
* @var int
*/
var $min_tries = 3;
/**
* Send Reads To Masters. This disables slave connections while true.
* Otherwise it is an array of written tables.
* @var array
*/
var $srtm = array();
/**
* The log of db connections made and the time each one took
* @var array
*/
var $db_connections;
/**
* The list of unclosed connections sorted by LRU
*/
var $open_connections = array();
/**
* Lookup array (dbhname => host:port)
* @var array
*/
var $dbh2host = array();
/**
* The last server used and the database name selected
* @var array
*/
var $last_used_server;
/**
* Lookup array (dbhname => (server, db name) ) for re-selecting the db
* when a link is re-used.
* @var array
*/
var $used_servers = array();
/**
* Whether to save debug_backtrace in save_query_callback. You may wish
* to disable this, e.g. when tracing out-of-memory problems.
*/
var $save_backtrace = true;
/**
* Maximum lag in seconds. Set null to disable. Requires callbacks.
* @var integer
*/
var $default_lag_threshold = null;
/**
* Gets ready to make database connections
* @param array db class vars
*/
function __construct( $args = null ) {
if ( is_array($args) )
foreach ( get_class_vars(__CLASS__) as $var => $value )
if ( isset($args[$var]) )
$this->$var = $args[$var];
$this->init_charset();
}
/**
* Triggers __construct() for backwards compatibility with PHP4
*/
function hyperdb( $args = null ) {
return $this->__construct($args);
}
/**
* Sets $this->charset and $this->collate
*/
function init_charset() {
if ( function_exists('is_multisite') && is_multisite() ) {
$this->charset = 'utf8';
if ( defined( 'DB_COLLATE' ) && DB_COLLATE )
$this->collate = DB_COLLATE;
else
$this->collate = 'utf8_general_ci';
} elseif ( defined( 'DB_COLLATE' ) ) {
$this->collate = DB_COLLATE;
}
if ( defined( 'DB_CHARSET' ) )
$this->charset = DB_CHARSET;
}
/**
* Add the connection parameters for a database
*/
function add_database( $db ) {
extract($db, EXTR_SKIP);
isset($dataset) or $dataset = 'global';
isset($read) or $read = 1;
isset($write) or $write = 1;
unset($db['dataset']);
if ( $read )
$this->hyper_servers[ $dataset ][ 'read' ][ $read ][] = $db;
if ( $write )
$this->hyper_servers[ $dataset ][ 'write' ][ $write ][] = $db;
}
/**
* Specify the dateset where a table is found
*/
function add_table( $dataset, $table ) {
$this->hyper_tables[ $table ] = $dataset;
}
/**
* Add a callback to a group of callbacks.
* The default group is 'dataset', used to examine
* queries and determine dataset.
*/
function add_callback( $callback, $group = 'dataset' ) {
$this->hyper_callbacks[ $group ][] = $callback;
}
/**
* Find the first table name referenced in a query
* @param string query
* @return string table
*/
function get_table_from_query ( $q ) {
// Remove characters that can legally trail the table name
$q = rtrim($q, ';/-#');
// allow (select...) union [...] style queries. Use the first queries table name.
$q = ltrim($q, "\t (");
// Quickly match most common queries
if ( preg_match('/^\s*(?:'
. 'SELECT.*?\s+FROM'
. '|INSERT(?:\s+IGNORE)?(?:\s+INTO)?'
. '|REPLACE(?:\s+INTO)?'
. '|UPDATE(?:\s+IGNORE)?'
. '|DELETE(?:\s+IGNORE)?(?:\s+FROM)?'
. ')\s+`?([\w-]+)`?/is', $q, $maybe) )
return $maybe[1];
// Refer to the previous query
if ( preg_match('/^\s*SELECT.*?\s+FOUND_ROWS\(\)/is', $q) )
return $this->last_table;
// SHOW TABLE STATUS and SHOW TABLES
if ( preg_match('/^\s*(?:'
. 'SHOW\s+TABLE\s+STATUS.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)'
. '|SHOW\s+(?:FULL\s+)?TABLES.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)'
. ')\W([\w-]+)\W/is', $q, $maybe) )
return $maybe[1];
// Big pattern for the rest of the table-related queries in MySQL 5.0
if ( preg_match('/^\s*(?:'
. '(?:EXPLAIN\s+(?:EXTENDED\s+)?)?SELECT.*?\s+FROM'
. '|INSERT(?:\s+LOW_PRIORITY|\s+DELAYED|\s+HIGH_PRIORITY)?(?:\s+IGNORE)?(?:\s+INTO)?'
. '|REPLACE(?:\s+LOW_PRIORITY|\s+DELAYED)?(?:\s+INTO)?'
. '|UPDATE(?:\s+LOW_PRIORITY)?(?:\s+IGNORE)?'
. '|DELETE(?:\s+LOW_PRIORITY|\s+QUICK|\s+IGNORE)*(?:\s+FROM)?'
. '|DESCRIBE|DESC|EXPLAIN|HANDLER'
. '|(?:LOCK|UNLOCK)\s+TABLE(?:S)?'
. '|(?:RENAME|OPTIMIZE|BACKUP|RESTORE|CHECK|CHECKSUM|ANALYZE|OPTIMIZE|REPAIR).*\s+TABLE'
. '|TRUNCATE(?:\s+TABLE)?'
. '|CREATE(?:\s+TEMPORARY)?\s+TABLE(?:\s+IF\s+NOT\s+EXISTS)?'
. '|ALTER(?:\s+IGNORE)?\s+TABLE'
. '|DROP\s+TABLE(?:\s+IF\s+EXISTS)?'
. '|CREATE(?:\s+\w+)?\s+INDEX.*\s+ON'
. '|DROP\s+INDEX.*\s+ON'
. '|LOAD\s+DATA.*INFILE.*INTO\s+TABLE'
. '|(?:GRANT|REVOKE).*ON\s+TABLE'
. '|SHOW\s+(?:.*FROM|.*TABLE)'
. ')\s+`?([\w-]+)`?/is', $q, $maybe) )
return $maybe[1];
}
/**
* Determine the likelihood that this query could alter anything
* @param string query
* @return bool
*/
function is_write_query( $q ) {
// Quick and dirty: only SELECT statements are considered read-only.
$q = ltrim($q, "\r\n\t (");
return !preg_match('/^(?:SELECT|SHOW|DESCRIBE|DESC|EXPLAIN)\s/i', $q);
}
/**
* Return true if the specified table is read only. This is not as safe as locking the
* database in code, but in cases where database locks are not possible (i.e., Percona
* xdbc) it is necessary to have some facility for locking that occurs outside of the
* database.
*
* To use this file, drop a file into the DOCROOT named '_wpeprivate/.wpdbreadonly'
* containing one table name per line of the tables that should be read only.
*
* @param string $table the name of the table.
* @return bool true if the table is marked read only.
*/
function is_table_read_only( $table ) {
static $tables = null;
if ( $tables === null ) {
$file = ABSPATH . '/_wpeprivate/.wpdbreadonly';
if ( file_exists( $file ) ) {
$contents = file( $file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES );
if ( $contents === false ) {
return false;
}
$this->tables = array_fill_keys( $contents, true );
}
}
return isset( $this->tables[$table] );
}
/**
* Set a flag to prevent reading from slaves which might be lagging after a write
*/
function send_reads_to_masters() {
$this->srtm = true;
}
/**
* Callbacks are executed in the order in which they are registered until one
* of them returns something other than null.
*/
function run_callbacks( $group, $args = null) {
if ( !isset( $this->hyper_callbacks[ $group ] ) || !is_array( $this->hyper_callbacks[ $group ] ) )
return null;
if ( !isset($args) ) {
$args = array( &$this );
} elseif ( is_array( $args ) ) {
$args[] = &$this;
} else {
$args = array( $args, &$this );
}
foreach ( $this->hyper_callbacks[ $group ] as $func ) {
$result = call_user_func_array($func, $args);
if ( isset($result) )
return $result;
}
}
/**
* Figure out which database server should handle the query, and connect to it.
* @param string query
* @return resource mysql database connection
*/
function db_connect( $query = '' ) {
$connect_function = $this->persistent ? 'mysql_pconnect' : 'mysql_connect';
if ( empty( $query ) )
return false;
$this->last_table = $this->table = $this->get_table_from_query($query);
if ( isset($this->hyper_tables[$this->table]) ) {
$dataset = $this->hyper_tables[$this->table];
$this->callback_result = null;
} elseif ( null !== $this->callback_result = $this->run_callbacks( 'dataset', $query ) ) {
if ( is_array($this->callback_result) )
extract( $this->callback_result, EXTR_OVERWRITE );
else
$dataset = $this->callback_result;
}
if ( ! isset($dataset) )
$dataset = 'global';
if ( ! $dataset )
return $this->bail("Unable to determine which dataset to query. ($this->table)");
else
$this->dataset = $dataset;
$this->run_callbacks( 'dataset_found', $dataset );
if ( empty( $this->hyper_servers ) ) {
if ( is_resource( $this->dbh ) )
return $this->dbh;
if (
!defined('DB_HOST')
|| !defined('DB_USER')
|| !defined('DB_PASSWORD')
|| !defined('DB_NAME') )
return $this->bail("We were unable to query because there was no database defined.");
$this->dbh = @ $connect_function(DB_HOST, DB_USER, DB_PASSWORD, true);
if ( ! is_resource( $this->dbh ) )
return $this->bail("We were unable to connect to the database. (DB_HOST)");
if ( ! mysql_select_db(DB_NAME, $this->dbh) )
return $this->bail("We were unable to select the database.");
if ( ! empty( $this->charset ) ) {
$_collate = ! empty( $this->collate ) ? $this->collate : null;
$this->set_charset( $this->dbh, $this->charset, $_collate );
}
return $this->dbh;
}
// Determine whether the query must be sent to the master (a writable server)
if ( !empty( $use_master ) || $this->srtm === true || isset($this->srtm[$this->table]) ) {
$use_master = true;
} elseif ( $is_write = $this->is_write_query($query) ) {
$use_master = true;
if ( is_array($this->srtm) )
$this->srtm[$this->table] = true;
} elseif ( !isset($use_master) && is_array($this->srtm) && !empty($this->srtm) ) {
// Detect queries that have a join in the srtm array.
$use_master = false;
$query_match = substr( $query, 0, 1000 );
foreach ( $this->srtm as $key => $value ) {
if ( false !== stripos( $query_match, $key ) ) {
$use_master = true;
break;
}
}
} else {
$use_master = false;
}
if ( $use_master ) {
$this->dbhname = $dbhname = $dataset . '__w';
$operation = 'write';
} else {
$this->dbhname = $dbhname = $dataset . '__r';
$operation = 'read';
}
// Try to reuse an existing connection
while ( isset( $this->dbhs[$dbhname] ) && is_resource( $this->dbhs[$dbhname] ) ) {
// Find the connection for incrementing counters
foreach ( array_keys($this->db_connections) as $i )
if ( $this->db_connections[$i]['dbhname'] == $dbhname )
$conn =& $this->db_connections[$i];
if ( isset($server['name']) ) {
$name = $server['name'];
// A callback has specified a database name so it's possible the existing connection selected a different one.
if ( $name != $this->used_servers[$dbhname]['name'] ) {
if ( !mysql_select_db($name, $this->dbhs[$dbhname]) ) {
// this can happen when the user varies and lacks permission on the $name database
if ( isset( $conn['disconnect (select failed)'] ) )
++$conn['disconnect (select failed)'];
else
$conn['disconnect (select failed)'] = 1;
$this->disconnect($dbhname);
break;
}
$this->used_servers[$dbhname]['name'] = $name;
}
} else {
$name = $this->used_servers[$dbhname]['name'];
}
$this->current_host = $this->dbh2host[$dbhname];
// Keep this connection at the top of the stack to prevent disconnecting frequently-used connections
if ( $k = array_search($dbhname, $this->open_connections) ) {
unset($this->open_connections[$k]);
$this->open_connections[] = $dbhname;
}
$this->last_used_server = $this->used_servers[$dbhname];
$this->last_connection = compact('dbhname', 'name');
if ( !mysql_ping($this->dbhs[$dbhname]) ) {
if ( isset( $conn['disconnect (ping failed)'] ) )
++$conn['disconnect (ping failed)'];
else
$conn['disconnect (ping failed)'] = 1;
$this->disconnect($dbhname);
break;
}
if ( isset( $conn['queries'] ) )
++$conn['queries'];
else
$conn['queries'] = 1;
return $this->dbhs[$dbhname];
}
if ( $use_master && defined( "MASTER_DB_DEAD" ) ) {
return $this->bail("We're updating the database, please try back in 5 minutes. If you are posting to your blog please hit the refresh button on your browser in a few minutes to post the data again. It will be posted as soon as the database is back online again.");
}
if ( empty($this->hyper_servers[$dataset][$operation]) )
return $this->bail("No databases available with $this->table ($dataset)");
// Put the groups in order by priority
ksort($this->hyper_servers[$dataset][$operation]);
// Make a list of at least $this->min_tries connections to try, repeating as necessary.
$servers = array();
do {
foreach ( $this->hyper_servers[$dataset][$operation] as $group => $items ) {
$keys = array_keys($items);
shuffle($keys);
foreach ( $keys as $key )
$servers[] = compact('group', 'key');
}
if ( !$tries_remaining = count( $servers ) )
return $this->bail("No database servers were found to match the query. ($this->table, $dataset)");
if ( !isset( $unique_servers ) )
$unique_servers = $tries_remaining;
} while ( $tries_remaining < $this->min_tries );
// Connect to a database server
do {
$unique_lagged_slaves = array();
$success = false;
foreach ( $servers as $group_key ) {
--$tries_remaining;
// If all servers are lagged, we need to start ignoring the lag and retry
if ( count( $unique_lagged_slaves ) == $unique_servers )
break;
// $group, $key
extract($group_key, EXTR_OVERWRITE);
// $host, $user, $password, $name, $read, $write [, $lag_threshold, $connect_function, $timeout ]
extract($this->hyper_servers[$dataset][$operation][$group][$key], EXTR_OVERWRITE);
$port = null;
// Split host:port into $host and $port
if ( strpos($host, ':') )
list($host, $port) = explode(':', $host);
// Overlay $server if it was extracted from a callback
if ( isset($server) && is_array($server) )
extract($server, EXTR_OVERWRITE);
// Split again in case $server had host:port
if ( strpos($host, ':') )
list($host, $port) = explode(':', $host);
// Make sure there's always a port number
if ( empty($port) )
$port = 3306;
// Use a default timeout of 200ms
if ( !isset($timeout) )
$timeout = 0.2;
// Get the minimum group here, in case $server rewrites it
if ( !isset( $min_group ) || $min_group > $group )
$min_group = $group;
// Can be used by the lag callbacks
$this->lag_cache_key = "$host:$port";
$this->lag_threshold = isset($lag_threshold) ? $lag_threshold : $this->default_lag_threshold;
// Check for a lagged slave, if applicable
if ( !$use_master && !$write && !isset( $ignore_slave_lag )
&& isset($this->lag_threshold) && !isset( $server['host'] )
&& ( $lagged_status = $this->get_lag_cache() ) === HYPERDB_LAG_BEHIND
) {
// If it is the last lagged slave and it is with the best preference we will ignore its lag
if ( !isset( $unique_lagged_slaves["$host:$port"] )
&& $unique_servers == count( $unique_lagged_slaves ) + 1
&& $group == $min_group )
{
$this->lag_threshold = null;
} else {
$unique_lagged_slaves["$host:$port"] = $this->lag;
continue;
}
}
$this->timer_start();
// Connect if necessary or possible
$tcp = null;
if ( $use_master || !$tries_remaining || !$this->check_tcp_responsiveness
|| true === $tcp = $this->check_tcp_responsiveness($host, $port, $timeout) )
{
$this->dbhs[$dbhname] = @ $connect_function( "$host:$port", $user, $password, true );
} else {
$this->dbhs[$dbhname] = false;
}
$elapsed = $this->timer_stop();
if ( is_resource( $this->dbhs[$dbhname] ) ) {
/**
* If we care about lag, disconnect lagged slaves and try to find others.
* We don't disconnect if it is the last lagged slave and it is with the best preference.
*/
if ( !$use_master && !$write && !isset( $ignore_slave_lag )
&& isset($this->lag_threshold) && !isset( $server['host'] )
&& $lagged_status !== HYPERDB_LAG_OK
&& ( $lagged_status = $this->get_lag() ) === HYPERDB_LAG_BEHIND
&& !(
!isset( $unique_lagged_slaves["$host:$port"] )
&& $unique_servers == count( $unique_lagged_slaves ) + 1
&& $group == $min_group
)
) {
$success = false;
$unique_lagged_slaves["$host:$port"] = $this->lag;
$this->disconnect( $dbhname );
$this->dbhs[$dbhname] = false;
$msg = "Replication lag of {$this->lag}s on $host:$port ($dbhname)";
$this->print_error( $msg );
continue;
} elseif ( mysql_select_db( $name, $this->dbhs[ $dbhname ] ) ) {
$success = true;
$this->current_host = "$host:$port";
$this->dbh2host[$dbhname] = "$host:$port";
$queries = 1;
$lag = isset( $this->lag ) ? $this->lag : 0;
$this->last_connection = compact('dbhname', 'host', 'port', 'user', 'name', 'tcp', 'elapsed', 'success', 'queries', 'lag');
$this->db_connections[] = $this->last_connection;
$this->open_connections[] = $dbhname;
break;
}
}
$success = false;
$this->last_connection = compact('dbhname', 'host', 'port', 'user', 'name', 'tcp', 'elapsed', 'success');
$this->db_connections[] = $this->last_connection;
$msg = date( "Y-m-d H:i:s" ) . " Can't select $dbhname - \n";
$msg .= "'referrer' => '{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}',\n";
$msg .= "'server' => {$server},\n";
$msg .= "'host' => {$host},\n";
$msg .= "'error' => " . mysql_error() . ",\n";
$msg .= "'errno' => " . mysql_errno() . ",\n";
$msg .= "'tcp_responsive' => " . ( $tcp === true ? 'true' : $tcp ) . ",\n";
$msg .= "'lagged_status' => " . ( isset( $lagged_status ) ? $lagged_status : HYPERDB_LAG_UNKNOWN );
$this->print_error( $msg );
}
if ( !$success || !isset($this->dbhs[$dbhname]) || !is_resource( $this->dbhs[$dbhname] ) ) {
if ( !isset( $ignore_slave_lag ) && count( $unique_lagged_slaves ) ) {
// Lagged slaves were not used. Ignore the lag for this connection attempt and retry.
$ignore_slave_lag = true;
$tries_remaining = count( $servers );
continue;
}
$error_details = array(
'host' => $host,
'port' => $port,
'operation' => $operation,
'table' => $this->table,
'dataset' => $dataset,
'dbhname' => $dbhname
);
$this->run_callbacks( 'db_connection_error', $error_details );
return $this->bail( "Unable to connect to $host:$port to $operation table '$this->table' ($dataset)" );
}
break;
} while ( true );
if ( !isset( $charset ) )
$charset = null;
if ( !isset( $collate ) )
$collate = null;
$this->set_charset($this->dbhs[$dbhname], $charset, $collate);
$this->dbh = $this->dbhs[$dbhname]; // needed by $wpdb->_real_escape()
$this->last_used_server = compact('host', 'user', 'name', 'read', 'write');
$this->used_servers[$dbhname] = $this->last_used_server;
while ( !$this->persistent && count($this->open_connections) > $this->max_connections ) {
$oldest_connection = array_shift($this->open_connections);
if ( $this->dbhs[$oldest_connection] != $this->dbhs[$dbhname] )
$this->disconnect($oldest_connection);
}
return $this->dbhs[$dbhname];
}
/*
* Force addslashes() for the escapes.
*
* HyperDB makes connections when a query is made
* which is why we can't use mysql_real_escape_string() for escapes.
* This is also the reason why we don't allow certain charsets. See set_charset().
*/
function _real_escape( $string ) {
return addslashes( $string );
}
/**
* Sets the connection's character set.
* @param resource $dbh The resource given by mysql_connect
* @param string $charset The character set (optional)
* @param string $collate The collation (optional)
*/
function set_charset($dbh, $charset = null, $collate = null) {
if ( ! isset( $charset ) )
$charset = $this->charset;
if ( ! isset( $collate ) )
$collate = $this->collate;
if ( ! in_array( strtolower( $charset ), array( 'utf8', 'latin1' ) ) )
wp_die( "$charset charset isn't supported in HyperDB for security reasons" );
if ( $this->has_cap( 'collation', $dbh ) && !empty( $charset ) ) {
if ( function_exists( 'mysql_set_charset' ) && $this->has_cap( 'set_charset', $dbh ) ) {
mysql_set_charset( $charset, $dbh );
$this->real_escape = true;
} else {
$query = $this->prepare( 'SET NAMES %s', $charset );
if ( ! empty( $collate ) )
$query .= $this->prepare( ' COLLATE %s', $collate );
mysql_query( $query, $dbh );
}
}
}
/**
* Disconnect and remove connection from open connections list
* @param string $tdbhname
*/
function disconnect($dbhname) {
if ( $k = array_search($dbhname, $this->open_connections) )
unset($this->open_connections[$k]);
if ( is_resource($this->dbhs[$dbhname]) )
mysql_close($this->dbhs[$dbhname]);
unset($this->dbhs[$dbhname]);
}
/**
* Kill cached query results
*/
function flush() {
$this->last_error = '';
$this->num_rows = 0;
parent::flush();
}
/**
* Basic query. See docs for more details.
* @param string $query
* @return int number of rows
*/
function query($query) {
// 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);
// can we write to the table in question?
if ( $this->is_write_query( $query ) && $this->is_table_read_only( $this->get_table_from_query( $query ) ) ) {
return false;
}
// initialise return
$return_val = 0;
$this->flush();
// 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 ( preg_match('/^\s*SELECT\s+FOUND_ROWS(\s*)/i', $query) && is_resource($this->last_found_rows_result) ) {
$this->result = $this->last_found_rows_result;
$elapsed = 0;
} else {
$this->dbh = $this->db_connect( $query );
if ( ! is_resource($this->dbh) )
return false;
$this->timer_start();
$this->result = mysql_query($query, $this->dbh);
$elapsed = $this->timer_stop();
++$this->num_queries;
if ( preg_match('/^\s*SELECT\s+SQL_CALC_FOUND_ROWS\s/i', $query) ) {
if ( false === strpos($query, "NO_SELECT_FOUND_ROWS") ) {
$this->timer_start();
$this->last_found_rows_result = mysql_query("SELECT FOUND_ROWS()", $this->dbh);
$elapsed += $this->timer_stop();
++$this->num_queries;
$query .= "; SELECT FOUND_ROWS()";
}
} else {
$this->last_found_rows_result = null;
}
if ( $this->save_queries ) {
if ( is_callable($this->save_query_callback) )
$this->queries[] = call_user_func_array( $this->save_query_callback, array( $query, $elapsed, $this->save_backtrace ? debug_backtrace( false ) : null, &$this ) );
else
$this->queries[] = array( $query, $elapsed, $this->get_caller() );
}
}
// If there is an error then take note of it
if ( $this->last_error = mysql_error($this->dbh) ) {
$this->print_error($this->last_error);
return false;
}
if ( preg_match("/^\\s*(insert|delete|update|replace|alter) /i",$query) ) {
$this->rows_affected = mysql_affected_rows($this->dbh);
// Take note of the insert_id
if ( preg_match("/^\\s*(insert|replace) /i",$query) ) {
$this->insert_id = mysql_insert_id($this->dbh);
}
// Return number of rows affected
$return_val = $this->rows_affected;
} else {
$i = 0;
$this->col_info = array();
while ($i < @mysql_num_fields($this->result)) {
$this->col_info[$i] = @mysql_fetch_field($this->result);
$i++;
}
$num_rows = 0;
$this->last_result = array();
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
$this->num_rows = $num_rows;
// Return number of rows selected
$return_val = $this->num_rows;
}
return $return_val;
}
/**
* Whether or not MySQL database is at least the required minimum version.
* The additional argument allows the caller to check a specific database.
*
* @since 2.5.0
* @uses $wp_version
*
* @return WP_Error
*/
function check_database_version( $dbh_or_table = false ) {
global $wp_version;
// Make sure the server has MySQL 4.1.2
$mysql_version = preg_replace( '|[^0-9\.]|', '', $this->db_version( $dbh_or_table ) );
if ( version_compare($mysql_version, '4.1.2', '<') )
return new WP_Error( 'database_version', sprintf(__('<strong>ERROR</strong>: WordPress %s requires MySQL 4.1.2 or higher'), $wp_version) );
}
/**
* This function is called when WordPress is generating the table schema to determine wether or not the current database
* supports or needs the collation statements.
* The additional argument allows the caller to check a specific database.
* @return bool
*/
function supports_collation( $dbh_or_table = false ) {
return $this->has_cap( 'collation', $dbh_or_table );
}
/**
* Generic function to determine if a database supports a particular feature
* The additional argument allows the caller to check a specific database.
* @param string $db_cap the feature
* @param false|string|resource $dbh_or_table the databaese (the current database, the database housing the specified table, or the database of the mysql resource)
* @return bool
*/
function has_cap( $db_cap, $dbh_or_table = false ) {
$version = $this->db_version( $dbh_or_table );
switch ( strtolower( $db_cap ) ) :
case 'collation' :
case 'group_concat' :
case 'subqueries' :
return version_compare($version, '4.1', '>=');
case 'set_charset' :
return version_compare($version, '5.0.7', '>=');
endswitch;
return false;
}
/**
* The database version number
* @param false|string|resource $dbh_or_table the databaese (the current database, the database housing the specified table, or the database of the mysql resource)
* @return false|string false on failure, version number on success
*/
function db_version( $dbh_or_table = false ) {
if ( !$dbh_or_table && $this->dbh )
$dbh =& $this->dbh;
elseif ( is_resource( $dbh_or_table ) )
$dbh =& $dbh_or_table;
else
$dbh = $this->db_connect( "SELECT FROM $dbh_or_table $this->users" );
if ( $dbh )
return preg_replace('/[^0-9.].*/', '', mysql_get_server_info( $dbh ));
return false;
}
/**
* Get the name of the function that called wpdb.
* @return string the name of the calling function
*/
function get_caller() {
// requires PHP 4.3+
if ( !is_callable('debug_backtrace') )
return '';
$bt = debug_backtrace( false );
$caller = '';
foreach ( (array) $bt as $trace ) {
if ( isset($trace['class']) && is_a( $this, $trace['class'] ) )
continue;
elseif ( !isset($trace['function']) )
continue;
elseif ( strtolower($trace['function']) == 'call_user_func_array' )
continue;
elseif ( strtolower($trace['function']) == 'apply_filters' )
continue;
elseif ( strtolower($trace['function']) == 'do_action' )
continue;
if ( isset($trace['class']) )
$caller = $trace['class'] . '::' . $trace['function'];
else
$caller = $trace['function'];
break;
}
return $caller;
}
/**
* Check the responsiveness of a tcp/ip daemon
* @return (bool) true when $host:$post responds within $float_timeout seconds, else (bool) false
*/
function check_tcp_responsiveness( $host, $port, $float_timeout ) {
if ( function_exists( 'apc_store' ) ) {
$use_apc = true;
$apc_key = "{$host}{$port}";
$apc_ttl = 10;
} else {
$use_apc = false;
}
if ( $use_apc ) {
$cached_value = apc_fetch( $apc_key );
switch ( $cached_value ) {
case 'up':
$this->tcp_responsive = 'true';
return true;
case 'down':
$this->tcp_responsive = 'false';
return false;
}
}
$socket = @ fsockopen( $host, $port, $errno, $errstr, $float_timeout );
if ( $socket === false ) {
if ( $use_apc )
apc_store( $apc_key, 'down', $apc_ttl );
return "[ > $float_timeout ] ($errno) '$errstr'";
}
fclose( $socket );
if ( $use_apc )
apc_store( $apc_key, 'up', $apc_ttl );
return true;
}
function get_lag_cache() {
$this->lag = $this->run_callbacks( 'get_lag_cache' );
return $this->check_lag();
}
function get_lag() {
$this->lag = $this->run_callbacks( 'get_lag' );
return $this->check_lag();
}
function check_lag() {
if ( $this->lag === false )
return HYPERDB_LAG_UNKNOWN;
if ( $this->lag > $this->lag_threshold )
return HYPERDB_LAG_BEHIND;
return HYPERDB_LAG_OK;
}
// Helper functions for configuration
} // class hyperdb
$wpdb = new hyperdb();
require( DB_CONFIG_FILE );
?>
