+---------------------------------- * @version   1.2 (2013-5-31)  +---------------------------------- */include (dirname(__FILE__) . DIRECTORY_SEPARATOR . 'config.php');define('CLIENT_MULTI_RESULTS', 131072);class mysql {    /* 主机地址 */    private $Host = '127.0.0.1';     /* 数据库名称 */    private $dbName = DB_NAME;    /* 用户名 */    private $UserName = DB_USER;    /* 连接密码 */    private $Password = DB_PWD;    /* 数据库编码 */    private $dbCharSet = 'utf8';    /* 错误信息 */    private $errorMsg;    /* 最后一次执行的SQL */    private $lastSql;    /* 字段信息 */    private $fields = array();    /* 最后一次插入的ID */    public $lastInsID = null;    /* 数据库连接ID */    private $linkID = 0;    /* 当前查询ID */    private $queryID = null;        /*主键*/    private $pk = null;    public function __construct($DBName = '') {        if ($DBName != '')            $this->dbName = $DBName;        $this->connect();    }    /**      +----------------------------------------------------------     * 连接数据库方法      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */    public function connect() {        if ($this->linkID == 0) {            $this->linkID = mysql_connect($this->Host, $this->UserName, $this->Password, true, CLIENT_MULTI_RESULTS);            if (!$this->linkID) {                $this->errorMsg = '数据库连接错误\r\n' . mysql_error();                $this->halt();            }        }        if (!mysql_select_db($this->dbName, $this->linkID)) {            $this->errorMsg = '打开数据库失败' . mysql_error($this->linkID);            $this->halt('打开数据库失败');        }        $dbVersion = mysql_get_server_info($this->linkID);        if ($dbVersion >= "4.1") {            //使用UTF8存取数据库 需要mysql 4.1.0以上支持            mysql_query("SET NAMES '" . $this->dbCharSet . "'", $this->linkID);        }        //设置CharSet        mysql_query('set character set \'' . $this->dbCharSet . '\'', $this->linkID);        //设置 sql_model        if ($dbVersion > '5.0.1') {            mysql_query("SET sql_mode=''", $this->linkID);        }    }    /**      +----------------------------------------------------------     * 释放查询结果      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */    public function free() {        if($this->queryID != null)            mysql_free_result($this->queryID);        $this->queryID = null;    }    /**      +----------------------------------------------------------     * 执行语句      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     * @param string $sql  sql指令      +----------------------------------------------------------     * @return bool or resource      +----------------------------------------------------------     */    public function execute($sql) {        if ($this->linkID == 0)            $this->connect();        $this->lastSql = $sql;        $this->queryID = mysql_query($sql);        if (false == $this->queryID) {            $this->errorMsg = 'SQL语句执行失败\r\n' . mysql_error($this->linkID);            return false;        } else {            return $this->queryID;        }    }    /**      +----------------------------------------------------------     * 获取记录集的行数      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     * @param string $sql  sql指令 可为空     * 如为空：返回上一结果集记录数     * 如不为空：返回当前sql语句的记录数       +----------------------------------------------------------     * @return integer      +----------------------------------------------------------     */    public function getRowsNum($sql = '') {        if ($this->linkID == 0) {            $this->connect();        }        if ($sql != '') {            $this->execute($sql);        }        return mysql_num_rows($this->queryID);    }    /**      +----------------------------------------------------------     * 表单数据直接插入到数据表中      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     * @param string $tableName 数据表名      +----------------------------------------------------------     * @return 执行成功返回插入记录的索引记录，失败返回false      +----------------------------------------------------------     */    public function form2db($tableName) {        $_POST["add_time"] = date('Y-m-d H:i:s');        $data = $_POST;        $this->fields = $this->getFields($tableName);        $data = $this->_facade($data);        if ($this->insert($tableName, $data)) {            return $this->lastInsID;        } else {            return false;        }    }    /**      +----------------------------------------------------------     * 数据直接插入到数据表中      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     * @param string $tableName 数据表名      +----------------------------------------------------------     * @param array $data 插入的数据 数据键名对应字段名，键值对应值      +----------------------------------------------------------     * @return boolean      +----------------------------------------------------------     */    public function insert($tableName, $data) {        $values = $fields = array();        foreach ($data as $key => $val) {            $value = '\'' . addslashes($val) . '\'';            if (is_scalar($value)) { // 过滤非标量数据                $values[] = $value;                $fields[] = $key;            }        }        $sql = 'INSERT INTO ' . trim($tableName) . '(' . implode(',', $fields) . ') VALUES(' . implode(',', $values) . ')';        if ($this->execute($sql)) {            $this->errorMsg = '插入失败\r\n' . mysql_error($this->linkID);            $this->lastInsID = mysql_insert_id($this->linkID);            return true;        } else {            return false;        }    }    /**      +----------------------------------------------------------     * 更新操作      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     * @param string $tableName 数据表名      +----------------------------------------------------------     * @param array $data 插入的数据 数据键名对应字段名，键值对应值      +----------------------------------------------------------     * @param array $condition 更新条件，为安全起见，不能为空      +----------------------------------------------------------     * @param array $isForm 可为空，缺省为true     * 如果为true，会当成表单更新数据表来处理，自动映射字段     * 如果为false，会当成普通的更新来处理，不会自动映射字段      +----------------------------------------------------------     * @return boolean      +----------------------------------------------------------     */    public function update($tableName, $data, $condition, $isForm = true) {        if (empty($condition)) {            $this->errorMsg = '没有设置更新条件';            return false;        }        //处理分解condition        if(is_array($condition)){            $condition = self::_parseCondition($condition);        }        if ($isForm) {            $this->fields = $this->getFields($tableName);            $data = $this->_facade($data);        }        $sql = 'UPDATE ' . trim($tableName) . ' SET ';        foreach ($data as $key => $val) {            $sql .= $key . '=\'' . $val . '\',';        }        $sql = substr($sql, 0, strlen($sql) - 1);        $sql .= ' WHERE ' . $condition;        if ($this->execute($sql)) {            return true;        } else {            $this->errorMsg = '更新失败\r\n' . mysql_error($this->linkID);            return false;        }    }    /**      +----------------------------------------------------------     *  删除操作      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     * @param string $tableName 数据表名      +----------------------------------------------------------     * @param array $condition 更新条件，为安全起见，不能为空      +----------------------------------------------------------     * @return boolean      +----------------------------------------------------------     */    public function delete($tableName, $condition) {        //处理分解condition        if(is_array($condition)){            $condition = self::_parseCondition($condition);        }        $sql = 'delete from ' . $tableName . ' where 1=1 and ' . $condition;        if (!$this->execute($sql))            return false;        return true;    }        /**     +----------------------------------------------------------     * 利用__call魔术方法实现一些特殊的Model方法     +----------------------------------------------------------     * @access public     +----------------------------------------------------------     * @param string $method 方法名称     * @param array $args 调用参数     +----------------------------------------------------------     * @return mixed     +----------------------------------------------------------     */    public function __call($method,$args){                /*根据某个字段获取记录字段的值         * 例1：getFieldByid(student_info,100,name)---获取学生表中id为100的学生姓名         * 例2：getFieldByxh(student_info,201215030223,address)---获取学生表中学号为201015030223的地址         * 注："getFieldBy"不区分大小写，后面的字段名区分大小写         * 返回值：string         */        if(strtolower(substr($method,0,10)) == 'getfieldby'){            $name = substr($method,10);            $sql = 'select `'.$args[2].'` from '.$args[0].' where '.$name.'=\''.$args[1].'\'';            if($this->execute($sql)){                $row = mysql_fetch_array($this->queryID);                return $row[0];            }else{                return false;            }        }         /*根据某个字段和值获取某条记录         * 例1：getByid(student_info,100)---获取学生表中id为100的学生信息         * 例2：getByxh(student_info,201215030223)---获取学生表中学号为201015030223的学生信息         * 注："getBy"不区分大小写，后面的字段名区分大小写         * 返回值：array         */        elseif(strtolower(substr($method,0,5)) == 'getby'){            $ret = array();            $name = substr($method,5);            $sql = 'select * from '.$args[0].' where '.$name.'=\''.$args[1].'\'';            if($this->execute($sql)){                $row = mysql_fetch_array($this->queryID);                return $row;            }else{                return false;            }        }    }    /**      +----------------------------------------------------------     *  弹出错误提示，并终止运行      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     * @param string $msg 错误消息，可为空      +----------------------------------------------------------     */    public static function halt($msg = '') {        if ($msg != '') {            $msg .= '\r\n';        }        $error = mysql_error();        die($msg);    }    /**      +----------------------------------------------------------     *  获取最后一次查询ID      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */     public function getQueryId(){         return $this->queryID;     }          /**      +----------------------------------------------------------     *  获取最后一次数据库操作错误信息      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */    public function getLastError() {        return $this->errorMsg;    }    /**      +----------------------------------------------------------     *  获取最后一次执行的SQL语句      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */    public function getLastSql() {        return $this->lastSql;    }    /**      +----------------------------------------------------------     *  获取最后一次插入数据库记录的索引ID号      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */    public function getLastInsID() {        return $this->lastInsID;    }    /**      +----------------------------------------------------------     *  获取上一次操作影响的行数      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */    public function getAffectedRows() {        return mysql_affected_rows($this->linkID);    }    /**      +----------------------------------------------------------     * 取得数据表的字段信息      +----------------------------------------------------------     * @access public      +----------------------------------------------------------     */    public function getFields($tableName) {        $result = array();        $this->execute('SHOW COLUMNS FROM ' . $this->parseKey($tableName));        while ($row = mysql_fetch_array($this->queryID)) {            $result[] = $row;        }        $info = array();        if ($result) {            foreach ($result as $key => $val) {                $info[$val['Field']] = array(                    'name' => $val['Field'],                    'type' => $val['Type'],                    'notnull' => (bool) ($val['Null'] === ''), // not null is empty, null is yes                    'default' => $val['Default'],                    'primary' => (strtolower($val['Key']) == 'pri'),                    'autoinc' => (strtolower($val['Extra']) == 'auto_increment'),                );            }        }        return $info;    }    /**      +----------------------------------------------------------     * 字段和表名处理添加`      +----------------------------------------------------------     * @access protected      +----------------------------------------------------------     * @param string $key      +----------------------------------------------------------     * @return string      +----------------------------------------------------------     */    protected function parseKey(&$key) {        $key = trim($key);        if (false !== strpos($key, ' ') || false !== strpos($key, ',') || false !== strpos($key, '*') || false !== strpos($key, '(') || false !== strpos($key, '.') || false !== strpos($key, '`')) {            //如果包含* 或者 使用了sql方法 则不作处理        } else {            $key = '`' . $key . '`';        }        return $key;    }    /**      +----------------------------------------------------------     * 对保存到数据库的数据进行处理      +----------------------------------------------------------     * @access protected      +----------------------------------------------------------     * @param mixed $data 要操作的数据      +----------------------------------------------------------     * @return boolean      +----------------------------------------------------------     */    private function _facade($data) {        // 检查非数据字段        if (!empty($this->fields)) {            foreach ($data as $key => $val) {                if (!array_key_exists($key, $this->fields)) {                    unset($data[$key]);                }            }        }        return $data;    }        public function close(){        mysql_close($this->linkID);    }        public function __destruct(){        $this->close();            }    /*    ** 2013.5.25新增    */        public function getPk($table){        //将pk置为空        $this->pk = null;        $result = $this->getFields($table);        foreach($result as $key => $val){            if($val['primary']){                $this->pk = $key;                break;            }        }        return $this->pk;    }        public function fetch(&$rst = null , $array_type = MYSQL_ASSOC){        if($rst == null){            $rst = $this->queryID;        }        if($this->queryID)            return mysql_fetch_array($rst , $array_type);        else            return false;    }    //分解条件    private function _parseCondition($condition , $operator='AND'){        $return = '';        if (is_array($condition)) {            $index = 0;            foreach ($condition as $key => $value) {                if ($index) {                    $return .= " ".$operator;                }                $return .= "`{
   $key}`='{
   $value}'";                $index++;            }            return $return;        }else{            return false;        }    }    /*事务处理开始*/    public function beginTransaction(){        $this->execute("START TRANSACTION");    }    public function commit(){        $this->execute("COMMIT");      }    public function rollback(){        $this->execute("ROLLBACK");    }    /*事务处理结束*/        //根据条件查找一条记录    public function find($table,$condition = null,$field = null){        if(is_array($condition)){            $condition = self::_parseCondition($condition);        }        //处理condition和field        $condition = $condition == null ? null : (is_array($condition) ? self::_parseCondition($condition) : $condition);        $field = $field == null ? '*' : (is_array($field) ? implode(",",$field) : $field);        $sql = 'SELECT ' . $field . ' FROM '.$table;        if($condition != null){            $sql .= " WHERE " . $condition;        }        return $this->findOneBySql($sql);    }        //查找所有记录    public function findAll($table,$condition = null,$field = null){        if(is_array($condition)){            $condition = self::_parseCondition($condition);        }        //处理condition和field        $condition = $condition == null ? null : (is_array($condition) ? self::_parseCondition($condition) : $condition);        $field = $field == null ? '*' : (is_array($field) ? implode(",",$field) : $field);        $sql = 'SELECT ' . $field . ' FROM '.$table;        if($condition != null){            $sql .= " WHERE " . $condition;        }        return $this->findallBySql($sql);    }        public function findOneBySql($sql){        $sql .= " LIMIT 1";        $this->execute($sql);        return $this->fetch();    }        public function findAllBySql($sql){        $rows = array();        $this->execute($sql);        while($row = $this->fetch()){            $rows[] = $row;        }        return $rows;    }        public function findByPk($table,$_pk){        $pk = $this->getPk($table);        if($pk == null){            $this->errorMsg = "未找到该表的主键";            return false;        }else{            return $this->find($table,array(                $pk => $_pk            ));        }    }        public function deleteByPk($table,$_pk){        $pk = $this->getPk($table);        if($pk == null){            $this->errorMsg = "未找到该表的主键";            return false;        }else{            $sql = "DELETE FROM ".$table." WHERE `{
   $pk}`='{
   $_pk}'";            return $this->delete($table,array(                $pk => $_pk            ));        }    }    }/* * 类库更新日志  2013.5.25  * 1、update delete操作中的条件可以设置为数组形式$key=>$value * 2、增加事务处理功能（只针对innodb引擎） * 3、增加根据条件查找一条记录 * 4、增加根据条件查找所有记录 * 5、增加根据主键查找记录 * 6、增加根据主键删除记录 */?>