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标题 php数据库连接配合memcache
范文
    采用memcache与数据库连接查询的方式进行数据缓存目前是采用单个的memcache服务器，以后会添加多个的
    <?php
    /**
    * @author
    * @name data link class and memcache class
    * //使用memcache的查询结果
    * 传送sql语句，返回是查询后的数组，数组有可能为空
    * $dataArrayName = $db->get_Date($sql);
    * 如果查询的是单条数据，则要进行输出时采用
    * $dataArrayName[0]['字段名']的格式
    */
    class Datelink
    {
    private $DateServer = "localhost";//mysql数据库地址
    private $DateBase = "basename";//mysql中的数据库
    private $DateUser = "username";//mysql数据库连接帐号
    private $Datepwd = "userpwd";//mysql数据库连接密码
    private $dbLink;//连接对象
    private $result;//数据查询结果
    private $insert_id;//定义插入序号
    private $affected_rows;//定义影响行数
    static $data_obj;
    private $mem_obj;
    #采用单例模式,实例化时进行数据库连接
    function __construct(){
    $this->dbLink=@mysql_connect($this->DateServer,$this->DateUser,$this->Datepwd)or die(mysql_error());
    if(!$this->dbLink)$this->dbhalt("exsiting error when connecting!");
    if(!@mysql_select_db($this->DateBase,$this->dbLink))$this->dbhalt("can't use this database,please check database!");
    mysql_query("set names utf-8",$this->dbLink);//如果是utf-8可以改为utf-8
    $this->mem_obj = Mem::__GetObj();
    }
    private function __clone(){}
    static function contect_data(){
    if(!self::$data_obj instanceof self){
    self::$data_obj = new self();
    }
    return self::$data_obj;
    }
    function __set($name,$value){//设置属性
    $this->$name=$value;
    }
    function __get($name){//获取属性
    return $this->$name;
    }
    function dbhalt($errmsg){//错误反馈
    die($errmsg);
    }
    function get_Date($sql){//仅针对select 查询进行缓存
    if(preg_match("/^select/i",$sql)){//如果是select这里增加memcache内容的判断
    if($this->mem_obj->cache_Obj){//进行mem 查询看是否存在缓存
    if($temp=$this->mem_obj->get($sql)){
    $this->result=$temp;
    return $temp;
    }else{
    $this->execute($sql);
    $rows = $this->num_rows();
    $temp = array();
    for ($i=0;$i<$rows;$i++) {
    $fields = mysql_num_fields($this->result);
    $row = mysql_fetch_array($this->result);
    for ($j=0;$j<$fields;$j++) {
    if ($i == 0) {
    $columns[$j] = mysql_field_name($this->result,$j);
    }
    $temp[$i][$columns[$j]] = $row[$j];
    }
    }
    //$temp = $this->fetch_array();
    $this->mem_obj->set($sql,$temp);
    return $temp;
    }
    }//如果不是select 或者没有memcache
    }
    //如果以上没有进行 memcache的查询，则进行普通查询并返回
    $this->execute($sql);
    $rows = $this->num_rows();
    $temp = array();
    for ($i=0;$i<$rows;$i++) {
    $fields = mysql_num_fields($this->result);
    $row = mysql_fetch_array($this->result);
    for ($j=0;$j<$fields;$j++) {
    if ($i == 0) {
    $columns[$j] = mysql_field_name($this->result,$j);
    }
    $temp[$i][$columns[$j]] = $row[$j];
    }
    }
    return $temp;
    }
    function fetch_array(){
    return mysql_fetch_array($this->result);
    }
    function execute($sql){//执行sql
    $this->result = mysql_query($sql,$this->dbLink);
    }
    function num_rows(){//返回行数,参数记录集
    return mysql_num_rows($this->result);
    }
    function get_rows($sql){//返回行数,参数为sql
    $this->execute($sql);
    return $this->num_rows($this->result);
    }
    function insert($sql){//插入sql-有自动增长序号,返回新建序号
    $this->execute($sql);
    $this->insert_id = mysql_insert_id($this->dbLink);
    $this->free_result($this->result);
    return $this->insert_id;
    }
    function insert_($sql){//插入sql-没有自动增长序号,返回影响行数
    $this->execute($sql);
    $this->affected_rows = mysql_affected_rows($this->dbLink);
    $this->free_result($this->result);
    return $this->affected_rows;
    }
    function update($sql){//更新sql
    $this->execute($sql);
    $this->affected_rows=mysql_affected_rows($this->dbLink);
    $this->free_result($this->result);
    return $this->affected_rows;
    }
    function del($sql){//删除sql
    $this->execute($sql);
    $this->affected_rows=mysql_affected_rows($this->dbLink);
    $this->free_result($this->result);
    return $this->affected_rows;
    }
    function free_result(){//释放记录集
    @mysql_free_result($this->result);
    }
    function close(){//关闭当前数据库
    @mysql_close($this->dbLink);
    }
    }//结束class的括号
    class Mem{//memcache设置
    private $server_ip="";
    private $server_port="11211";//默认端口
    static $mem_Obj;
    public $cache_Obj;
    function __construct(){
    if($this->cache_Obj=@new Memcache){
    if(!@$this->cache_Obj->connect($this->server_ip,$this->server_port))$this->cache_Obj=false; }
    }
    private function __clone(){}
    static function __GetObj(){
    if(!self::$mem_Obj instanceof self)self::$mem_Obj = new self;
    return self::$mem_Obj;
    }
    public function set($sql,$tempSource){//设置cache
    return $this->cache_Obj->set(md5($sql),$tempSource);
    }
    public function add($sql,$tmpSource){//add添加cache，如果存在则删除后添加
    if($this->get($sql))$this->del($sql);
    return $this->set($sql,$tmpSource);
    }
    public function get($sql){//获取cache
    if($temp=$this->cache_Obj->get(md5($sql))){
    return $temp;
    }
    return false;
    }
    public function del($sql){//删除某个数据
    return $this->cache_Obj->delete(md5($sql));
    }
    public function delAll(){//让所有cache失效，并不清空，会有新数据取代
    return $this->cache_Obj->flush();
    }
    }
    $db=Datelink::contect_data(); //这里是调用数据库连接
    // $db->mem_obj->delAll();//这里可以其清除全部缓存
    ?>
    Memcache与mysql配合查询，进行数据缓存
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更新时间：2025/5/20 10:43:56