mysql 数据库操作类

mysql 数据库操作类 本款是利用php mysql 数据库操作类函数，他可以删除，修改，增加，备份等对数据库的操作哦，同时还支持两种数据库连接方式 哦，以前数据库编码等的设置。

mysql教程 数据库教程操作类
本款是利用php教程 mysql 数据库操作类函数，他可以删除，修改，增加，备份等对数据库的操作哦，同时还支持两种数据库连接方式 哦，以前数据库编码等的设置。
*/

class dbstuff {
var $querynum = 0;
var $link;
var $sqlid;
var $record;
var $dbcharset='utf-8';
var $charset='utf-8';
function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $halt = true) {
if($pconnect) {
if(!$this->link = @mysql_pconnect($dbhost, $dbuser, $dbpw)) {
$halt && $this->halt('can not connect to mysql server');
}
} else {
if(!$this->link = @mysql_connect($dbhost, $dbuser, $dbpw, 1)) {
$halt && $this->halt('can not connect to mysql server');
}
}

if($this->version() > '4.1') {
global $charset, $dbcharset;
if(!$dbcharset && in_array(strtolower($charset), array('gbk', 'big5', 'utf-8'))) {
$dbcharset = str_replace('-', '', $charset);
}

if($dbcharset) {
@mysql_query("set character_set_connection=$dbcharset, character_set_results=$dbcharset, character_set_client=binary", $this->link);
}

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

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 = '') {
global $debug, $discuz_starttime, $sqldebug, $sqlspenttimes;

$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();
$this->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect);
$this->query($sql, 'retry'.$type);
} elseif($type != 'silent' && substr($type, 5) != 'silent') {
$this->halt('mysql query error', $sql);
}
}

$this->querynum++;
$this->sqlid=$query;
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 result_first($sql) {
return $this->result($this->query($sql), 0);
}

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 nr($sql_id="") {
if(!$sql_id) $sql_id=$this->sqlid;
return mysql_num_rows($sql_id);
}

function nf($sql_id="") {
if(!$sql_id) $sql_id=$this->sqlid;
return mysql_num_fields($sql_id);
}

function nextrecord($sql_id="") {
if(!$sql_id) $sql_id=$this->sqlid;
if($this->record=mysql_fetch_array($sql_id)) return $this->record;
else return false;
}

function f($name) {
if($this->record[$name]) return $this->record[$name];
else return false;
}

function lock($tblname,$op="write") {
if(mysql_query("lock tables ".$tblname." ".$op)) return true;
else return false;
}

function unlock()
{if(mysql_query("unlock tables")) return true; else return false;}

function ar() {
return @mysql_affected_rows($this->link);
}

function i_id() {
return mysql_insert_id();
}

function halt($message = '', $sql = '') {
define('cache_forbidden', true);
include('db_mysql_error.inc.php');
}
}

?>