PHP的SqlHelp

pre = $pre;                $this->connect($host, $user, $pwd, $db);                Mysql::$self =  $this;        }                /**         * @param string $host         * @param string $host         * @param string $pwd         * @param string $db         * @param string $pre         * @return DB         */        public static function init($host='', $user='', $pwd='', $db='', $pre = '') {                if(!(Mysql::$self instanceof DB)){                          Mysql::$self = new Mysql($host, $user, $pwd, $db, $pre);                }                return Mysql::$self;        }        /**         * 创建连接         */        private function connect($host, $user, $pwd, $db, $pre = '') {                $this->pre = $pre;                if(! $this->link = mysql_connect($host, $user, $pwd)) die(                        'Connection to mysql server could not be established.');                if(! mysql_select_db($db, $this->link)) die(                        'Database could not be selected.');        }        /**         * 执行sql         * @param  string $sql         * @return Mysql          */        public function query($sql) {                $this->times ++;                $this->begintime = microtime();                mysql_query('SET NAMES '.self::$charset, $this->link);                $this->sql = $sql;                $this->q = mysql_query($sql, $this->link);                $this->alltime[] = array('t' => microtime() - $this->begintime,                        's' => $sql);                return $this;        }        /**         * 获取单个查询值         * @param  string $sql         * @return mixed         */        public function getOne($sql = '') {                if(strlen(trim($sql)) > 0){                        $this->query($sql);                }                if($this->check()){                        $result = mysql_fetch_array($this->q, MYSQL_NUM);                        mysql_free_result($this->q);                        return $result[0];                }                return false;        }        /**         * 获取一条记录         * @param  string $sql         * @return array         */        public function getRow($sql = '') {                if(strlen(trim($sql)) > 0){                        $this->query($sql);                }                if($this->check()){                        $result = mysql_fetch_assoc($this->q);                        mysql_free_result($this->q);                        return $result;                }else{                        return array();                }        }        /**         * 获取所有查询         * @param  string $sql         * @return array         */        public function getAll($sql = '') {                if(strlen(trim($sql)) > 0){                        $this->query($sql);                }                $return = array();                if($this->check()){                        while($temp = mysql_fetch_assoc($this->q))                                $return[] = $temp;                        $this->rows = mysql_num_rows($this->q);                        mysql_free_result($this->q);                        return $return;                }else{                        return array();                }        }        /**         * 获取插入ID         * @return int         */        public function InsertId($seq=0) {                return mysql_insert_id($this->link);        }        /**         * 获取影响行数         * @return  int         */        public function rowNummber() {                return $this->rows;        }        /**         * 检查查询是否成功         * @return bool         */        public function check() {                return $this->q === false ? false : true;        }                /**         * 获得连接         * @return resource         */        public function getLink() {                return $this->link;        }        /**         * 获得本次连接的查询语句         * @return string         */        public function getSQL() {                return $this->sql;        }        /**         * 获得类名         * @return string         */        public function __toString() {                return __CLASS__;        }        /**         * 获得执行时间         * @return float         */        public function getTimeInfo() {                return $this->alltime;        }        /**         * 获得执行次数         * @return Int         */        public function getTimes() {                return $this->times;        }        /**         * 获得结果行数         * @return Int         */        public function getResultRows() {                $rows = mysql_num_rows($this->q);                mysql_free_result($this->q);                return $rows;        }        /**         * $Id: Mysql.php 685 2009-12-03 10:49:04Z HH.Sun $         * 获得最后执行语句的错误         * @desc         getLastError         * @access       public         * @return        string         * @version      $Revision: 685 $         */        public function getLastError(){                return mysql_error($this->link);        }        /**         * $Id: Mysql.php 685 2009-12-03 10:49:04Z HH.Sun $         * mysql_real_escape_string 调用         * @desc          escape         * @access      public         * @param       string $sql         * @return       string         *         * @since         2009-9-25 下午02:06:41         * @version     $Revision: 685 $         */        public function escape($sql){                return mysql_real_escape_string($sql,$this->link);        }}?>  初始化:getOne($sql);$line  = $db->getRow($sql);$all    = $db->getAll($sql);//其他文件global $db;$sql = "................................................";$one = $db->getOne($sql);$line  = $db->getRow($sql);$all    = $db->getAll($sql);?>