php下mysql数据库操作类(改自discuz)

复制代码 代码如下:



$pt_mysql = new dbQuery;



class dbQuery {

var $querynum = 0;

var $link;


function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0) {
if($pconnect) {
if(!$this->link = @mysql_pconnect($dbhost, $dbuser, $dbpw)) {
$this->halt('Can not connect to MySQL server');
}
} else {
if(!$this->link = @mysql_connect($dbhost, $dbuser, $dbpw)) {
$this->halt('Can not connect to MySQL server');
}
}
if($this->version() > '4.1') {
global $dbcharset;
if($dbcharset) {
mysql_query("SET character_set_connection=$dbcharset, character_set_results=$dbcharset, character_set_client=binary", $this->link);
mysql_query("set names 'GBK'");
}

if($this->version() > '5.0.1') {
mysql_query("SET sql_mode=''", $this->link);
mysql_query("set names 'GBK'");
}
}

if($dbname) {
mysql_select_db($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 query($sql, $type = '') {

$func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ?
'mysql_unbuffered_query' : 'mysql_query';
if(!($query = $func($sql, $this->link)) && $type != 'SILENT') {
$this->halt('MySQL Query Error', $sql);
}

$this->querynum++;
return $query;
}

function affected_rows() {
return mysql_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) {
$query = @mysql_result($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("SELECT last_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() {
return mysql_get_server_info($this->link);
}

function close() {
return mysql_close($this->link);
}

function halt($message = '', $sql = '') {
echo $message . ' ' . $sql;
exit;

}
}

?>