Discuz7.2的数据库连接与读取的函数
文件db_mysql.class.php
<?php
classdbstuff {
var $version = '';
var $querynum = 0;
var $link = null;
function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect =0, $halt = TRUE, $dbcharset2 = '') {
$func = empty($pconnect) ? 'mysql_connect' :'mysql_pconnect';
if(!$this->link = @$func($dbhost, $dbuser, $dbpw,1)) {
$halt &&$this->halt('Can not connect to MySQLserver');
} else {
if($this->version() > '4.1'){
global $charset, $dbcharset;
$dbcharset = $dbcharset2 ? $dbcharset2 :$dbcharset;
$dbcharset = !$dbcharset &&in_array(strtolower($charset), array('gbk', 'big5', 'utf-8')) ?str_replace('-', '', $charset) :$dbcharset;
$serverset = $dbcharset ? 'character_set_connection='.$dbcharset.',character_set_results='.$dbcharset.', character_set_client=binary': '';
$serverset .= $this->version() >'5.0.1' ? ((empty($serverset) ? '' : ',').'sql_mode=\'\'') :'';
$serverset && mysql_query("SET$serverset", $this->link);
}
$dbname &&@mysql_select_db($dbname,$this->link);
}
}
function select_db($dbname) {
return mysql_select_db($dbname,$this->link);
}
function fetch_array($query, $result_type = MYSQL_ASSOC){
return mysql_fetch_array($query,$result_type);
}
function fetch_first($sql) {
return$this->fetch_array($this->query($sql));
}
function result_first($sql) {
return$this->result($this->query($sql),0);
}
function query($sql, $type = '') {
global $debug, $discuz_starttime, $sqldebug,$sqlspenttimes;
if(defined('SYS_DEBUG') &&SYS_DEBUG) {
@include_onceDISCUZ_ROOT.'./include/debug.func.php';
sqldebug($sql);
}
$func = $type == 'UNBUFFERED' &&@function_exists('mysql_unbuffered_query')?
'mysql_unbuffered_query' : 'mysql_query';
if(!($query = $func($sql, $this->link))){
if(in_array($this->errno(), array(2006, 2013))&& substr($type, 0, 5) != 'RETRY'){
$this->close();
require DISCUZ_ROOT.'./config.inc.php';
$this->connect($dbhost, $dbuser, $dbpw, $dbname,$pconnect, true, $dbcharset);
return $this->query($sql,'RETRY'.$type);
} elseif($type != 'SILENT' &&substr($type, 5) != 'SILENT') {
$this->halt('MySQL Query Error',$sql);
}
}
$this->querynum++;
return $query;
}
function affected_rows() {
returnmysql_affected_rows($this->link);
}
function error() {
return (($this->link) ?mysql_error($this->link) :mysql_error());
}
function errno() {
return intval(($this->link) ?mysql_errno($this->link) :mysql_errno());
}
function result($query, $row = 0) {
$query = @mysql_result($query, $row);
return $query;
}
function num_rows($query) {
$query = mysql_num_rows($query);
return $query;
}
function num_fields($query) {
return mysql_num_fields($query);
}
function free_result($query) {
return mysql_free_result($query);
}
function insert_id() {
return ($id = mysql_insert_id($this->link))>= 0 ? $id :$this->result($this->query("SELECTlast_insert_id()"), 0);
}
function fetch_row($query) {
$query = mysql_fetch_row($query);
return $query;
}
function fetch_fields($query) {
return mysql_fetch_field($query);
}
function version() {
if(empty($this->version)) {
$this->version =mysql_get_server_info($this->link);
}
return $this->version;
}
function close() {
returnmysql_close($this->link);
}
function halt($message = '', $sql = '') {
define('CACHE_FORBIDDEN', TRUE);
require_onceDISCUZ_ROOT.'./include/db_mysql_error.inc.php';
}
}
?>
