php MySQL数据库操作类源代码：
<?php
class MySQL{
private $host; //服务器地址
private $name; //登录账号
private $pwd; //登录密码
private $dBase; //数据库名称
private $conn; //数据库链接资源
private $result; //结果集
private $msg; //返回结果
private $fields; //返回字段
private $fieldsNum; //返回字段数
private $rowsNum; //返回结果数
private $rowsRst; //返回单条记录的字段数组
private $filesArray = array(); //返回字段数组
private $rowsArray = array(); //返回结果数组
private $charset='utf8'; //设置操作的字符集
private $query_count=; //查询结果次数
static private $_instance; //存储对象
//初始化类
private function __construct($host='',$name='',$pwd='',$dBase=''){
if($host != '') $this->host = $host;
if($name != '') $this->name = $name;
if($pwd != '') $this->pwd = $pwd;
if($dBase != '') $this->dBase = $dBase;
$this->init_conn();
}
//防止被克隆
private function __clone(){}
public static function getInstance($host='',$name='',$pwd='',$dBase=''){
if(FALSE == (self::$_instance instanceof self)){
self::$_instance = new self($host,$name,$pwd,$dBase);
}
return self::$_instance;
}
public function __set($name,$value){
$this->$name=$value;
}
public function __get($name){
return $this->$name;
}
//链接数据库
function init_conn(){
$this->conn=@mysql_connect($this->host,$this->name,$this->pwd) or die('connect db fail !');
@mysql_select_db($this->dBase,$this->conn) or die('select db fail !');
mysql_query("set names ".$this->charset);
}
//查询结果
function mysql_query_rst($sql){
if($this->conn == '') $this->init_conn();
$this->result = @mysql_query($sql,$this->conn);
$this->query_count++;
}
//取得字段数
function getFieldsNum($sql){
$this->mysql_query_rst($sql);
$this->fieldsNum = @mysql_num_fields($this->result);
}
//取得查询结果数
function getRowsNum($sql){
$this->mysql_query_rst($sql);
if(mysql_errno() == ){
return @mysql_num_rows($this->result);
}else{
return '';
}
}
//取得记录数组（单条记录）
function getRowsRst($sql,$type=MYSQL_BOTH){
$this->mysql_query_rst($sql);
if(empty($this->result)) return '';
if(mysql_error() == ){
$this->rowsRst = mysql_fetch_array($this->result,$type);
return $this->rowsRst;
}else{
return '';
}
}
//取得记录数组（多条记录）
function getRowsArray($sql,$type=MYSQL_BOTH){
!empty($this->rowsArray) ? $this->rowsArray=array() : '';
$this->mysql_query_rst($sql);
if(mysql_errno() == ){
while($row = mysql_fetch_array($this->result,$type)) {
$this->rowsArray[] = $row;
}
return $this->rowsArray;
}else{
return '';
}
}
//更新、删除、添加记录数
function uidRst($sql){
if($this->conn == ''){
$this->init_conn();
}
@mysql_query($sql);
$this->rowsNum = @mysql_affected_rows();
if(mysql_errno() == ){
return $this->rowsNum;
}else{
return '';
}
}
//返回最近插入的一条数据库的id值
function returnRstId($sql){
if($this->conn == ''){
$this->init_conn();
}
@mysql_query($sql);
if(mysql_errno() == ){
return mysql_insert_id();
}else{
return '';
}
}
//获取对应的字段值
function getFields($sql,$fields){
$this->mysql_query_rst($sql);
if(mysql_errno() == ){
if(mysql_num_rows($this->result) > ){
$tmpfld = @mysql_fetch_row($this->result);
$this->fields = $tmpfld[$fields]; }
return $this->fields;
}else{
return '';
}
}
//错误信息
function msg_error(){
if(mysql_errno() != ) {
$this->msg = mysql_error();
}
return $this->msg;
}
//释放结果集
function close_rst(){
mysql_free_result($this->result);
$this->msg = '';
$this->fieldsNum = ;
$this->rowsNum = ;
$this->filesArray = '';
$this->rowsArray = '';
}
//关闭数据库
function close_conn(){
$this->close_rst();
mysql_close($this->conn);
$this->conn = '';
}
//取得数据库版本
function db_version() {
return mysql_get_server_info();
}
}
调用方法如下：
include_once('mysql.class.php');
$db = MySQL::getInstance($db_host,$db_user,$db_pass,$db_data);
$sql = $db->getRowsArray("SELECT * FROM pre_forum_post WHERE fid=2 limit 0,5"); //选择数据
print_r($sql);