_initialize(); if(!isset($host)||!isset($user)||!isset($passowrd)||!isset($database)){ return false; }else{ $this->_host = $host; $this->_user = $user; $this->_password = $passowrd; $this->_database = $database; $this->_port = $port; $_dbObj = new mysqli($host,$user,$passowrd,$database,$port); if($_dbObj->connect_errno){$this->error = $_dbObj->connect_error;return false; }else{$this->_dbObj = $_dbObj;return $this; } } } /** * 错误信息函数 * 返回数据库操作过程中最后一次执行时的错误信息 * @access public * @return mixed 数据库连接错误信息(正常返回'') */ public function error(){ return $this->error; } // 回调方法 初始化模型 protected function _initialize() {} /** * 设置数据对象的值 * @access public * @param string $name 名称 * @param mixed $value 值 * @return void */ public function __set($name,$value) { // 设置数据对象属性 $this->data[$name] = $value; } /** * 获取数据对象的值 * @access public * @param string $name 名称 * @return mixed */ public function __get($name) { return isset($this->data[$name])?$this->data[$name]:null; } /** * 检测数据对象的值 * @access public * @param string $name 名称 * @return boolean */ public function __isset($name) { return isset($this->data[$name]); } /** * 销毁数据对象的值 * @access public * @param string $name 名称 * @return void */ public function __unset($name) { unset($this->data[$name]); } /** * 利用__call方法实现一些特殊的方法(对于调用类中不存在方法的解决方案) * @access public * @param string $method 方法名称 * @param array $args 调用参数 * @return mixed */ public function __call($method,$args) { /*if(in_array(strtolower($method),$this->methods,true)) { // 连贯操作的实现 $this->options[strtolower($method)] = $args[0]; return $this; }elseif(in_array(strtolower($method),array('count','sum','min','max','avg'),true)){ // 统计查询的实现 $field = isset($args[0])?$args[0]:'*'; return ; }elseif(strtolower(substr($method,0,5))=='getby') { // 根据某个字段获取记录 $field = parse_name(substr($method,5)); $where[$field] = $args[0]; return ; }elseif(strtolower(substr($method,0,10))=='getfieldby') { // 根据某个字段获取记录的某个值 $name = parse_name(substr($method,10)); $where[$name] =$args[0]; return ; }elseif(isset($this->_scope[$method])){// 命名范围的单独调用支持 return ; }else{ }*/ } /* * 选择数据库 * @access public * @param string $database 选择的数据库名称 * @return mixed 数据库连接信息 * */ public function select_db($database){ $select_db = mysqli_select_db($this->_dbObj,$database); if($select_db){ $this->_database = $database; $_dbObj = new mysqli($this->_host,$this->_user,$this->_password,$database,$this->_port); $this->_dbObj = $_dbObj; return $this; }else{ $this->error = mysqli_error($this->_dbObj); return false; } } /* * 数据库用户更换 * @access public * @param string $user 数据库用户名称 * @param string $password 数据库用户密码 * @return mixed 数据库连接信息 * */ public function change_user($user,$password){ $change_user = mysqli_change_user($this->_dbObj,$user,$password,$this->_database); if($change_user){ $this->_user = $user; $this->_password = $password; $_dbObj = new mysqli($this->_host,$this->_user,$this->_password,$this->_database,$this->_port); $this->_dbObj = $_dbObj; return $this; }else{ $this->error = mysqli_error($this->_dbObj); return false; } } /* * 查询数据库中所有的表名 * @access public * @return array 数据表的数量和表名 * */ public function tables(){ $sql = 'show tables'; $search_res = mysqli_query($this->_dbObj,$sql); if($search_res){ $num_rows = $search_res->num_rows; $tables_msg = array('count'=>$num_rows,'tables'=>array() ); for($i=0;$ifetch_assoc();$key = 'Tables_in_'.$this->_database;array_push($tables_msg['tables'],$row[$key]); } mysqli_free_result($search_res); return $tables_msg; }else{ mysqli_free_result($search_res); return false; } } /* * 获取指定表中所有信息 * @access public * @param string $table 数据表名称 * @return array 数据表的详细信息 * */ public function select_table($table){ $sql = 'select * from '.$table; $search_res = mysqli_query($this->_dbObj,$sql); if($search_res){ $this->_table = $table; $table_msg = self::query_handle($search_res); $this->_tableObj = $table_msg; mysqli_free_result($search_res); return $table_msg; }else{ mysqli_free_result($search_res); return false; } } /* * 获取指定表的字段详细信息 * @access public * @param string $table 数据表名称 * @return array 数据表的字段详细信息 * */ public function select_table_fields($table){ $sql = 'show fields from '.$table; $search_res = mysqli_query($this->_dbObj,$sql); if($search_res){ $this->_table = $table; $fields_msg = self::query_handle($search_res); mysqli_free_result($search_res); return $fields_msg; }else{ mysqli_free_result($search_res); return false; } } /* * 获取数据表中指定字段信息(允许多字段同时查询) * @access public * @param mixed $field 指定字段(字符串传入使用,间隔) * @return array 数据表中指定字段信息 * */ public function getField($field){ $fields = self::param_handle($field); $count = count($fields); for($i=0;$i_table; $res = mysqli_query($this->_dbObj,$sql); $field_msg[$index] = self::query_handle($res); } return $field_msg; } /* * mysqli_query函数结果处理函数 * @access protected * @param object $obj mysqli_query函数结果 * @return array 数据表中指定字段信息 * */ protected function query_handle($obj){ $res = array(); for($i=0;$inum_rows;$i++){ $row = $obj->fetch_assoc(); array_push($res,$row); } return $res; } /* * 传入参数处理函数 * @access protected * @param mixed $param 传入参数 * @return array 处理后数组数据 * */ public function param_handle($param){ if(is_string($param)&&!empty($param)){ $params = explode(',',$param); }elseif(is_array($param)&&!empty($param)){ $params = $param; }else{ return false; } return $params; } /* * 查询表达式参数处理函数 * @access protected * @param mixed $param 传入参数(where limit order) * @return string 处理后字符串数据 * */ public function options_handle($param){ if(is_numeric($param)){ $option = $param; }elseif(is_string($param)&&!empty($param)&&!is_numeric($param)){ $params = explode(',',$param); $count = count($params); $option = implode(' and ',$params); }elseif(is_array($param)&&!empty($param)){ $params = $param; $count = count($params); $arr = array(); foreach($param as $key=>$value){$tip = "$key=$value ";array_push($arr,$tip); } $option = implode(' and ',$arr); }else{ return false; } return $option; } /* * 查询表达式$options处理函数 * @access protected * @return string 处理后字符串数据 * */ protected function option(){ $optiOns= $this->options; $option = ''; if(isset($options['where'])){ $option .= 'where '.$options['where'].' '; } if(isset($options['order'])){ $option .= 'order by '.$options['order'].' '.$options['order_type'].' '; } if(isset($options['limit'])){ $option .= 'limit '.$options['limit']; } return $option; } /* * 根据查询表达式查询数据(符合条件的所有记录) * @access public * @return array 满足查询表达式的特定数据 * */ public function find(){ $option = self::option(); $sql = 'select * from '.$this->_table.' '.$option; $search_res = mysqli_query($this->_dbObj,$sql); $msg = self::query_handle($search_res); return $msg; } /* * 查询表达式 where处理函数 * @access public * @param mixed $where where查询条件 * @return object $this * */ public function where($where){ $this->options['where'] = self::options_handle($where); return $this; } /* * 查询表达式 limit处理函数 * @access public * @param mixed $limit limit查询条件(数字) * @return object $this * */ public function limit($limit){ $this->options['limit'] = self::options_handle($limit); return $this; } /* * 查询表达式 order处理函数 * @access public * @param string $order order查询条件 * @param string $type order查询条件的顺序(默认降序) * @return object $this * */ public function order($order,$type='desc'){ $this->options['order'] = $order; $this->options['order_type'] = $type; return $this; } /* * 数据处理函数(最多处理二维数据) * @access public * @param array $data 需要插入的数据 * @return object $this * */ public function data(array $data){ $values = array(); $fields = array(); if(is_array($data)){ foreach($data as $key=>$value){if(is_array($value)){ //二维数组 $tip = 1; array_push($values,'('.implode(',',array_values($value)).')'); array_push($fields,'('.implode(',',array_keys($value)).')');}else{ //一维数组 $tip = 0;} } }else{ return false; } if(!$tip){ array_push($values,'('.implode(',',array_values($data)).')'); array_push($fields,'('.implode(',',array_keys($data)).')'); } $this->data['fields'] = $fields[0]; $this->data['values'] = implode(',',$values); return $this; } /* * 数据新增函数 * @access public * @return mixed 数据库新增信息 * */ public function add(){ $fields = $this->data['fields']; $values = $this->data['values']; $sql = 'INSERT INTO '.$this->_table.$fields.'VALUES'.$values; $res = mysqli_query($this->_dbObj,$sql); return $res; } /* * 数据更新函数(一维数组) * @access public * @param array $data 需要更新的数据 * @return mixed 数据库新增信息 * */ function save(array $data){ $tip = array(); if(is_array($data)){ foreach($data as $key=>$value){array_push($tip,"$key=$value"); } }else{ return false; } $set_msg = implode(',',$tip); $sql = 'UPDATE '.$this->_table.' SET '.$set_msg.' WHERE '.$this->options['where']; $res = mysqli_query($this->_dbObj,$sql); return $res; } /* * 数据删除函数 * @access public * @return mixed 数据库删除信息 * */ public function delete(){ $sql = 'DELETE FROM '.$this->_table.' WHERE '.$this->options['where']; $res = mysqli_query($this->_dbObj,$sql); return $res; } /* * SQL语句查询 * */ public function query($sql){ $search_res = mysqli_query($this->_dbObj,$sql); return $search_res; } /* * mysql中查询语句 * */ protected function sql(){ /* * 基本SQL语句 * 插入数据:INSERT INTO tb_name(id,name,score)VALUES(NULL,'张三',140),(NULL,'张四',178),(NULL,'张五',134); * 更新语句:UPDATE tb_name SET score=189 WHERE id=2; * 删除数据:DELETE FROM tb_name WHERE id=3; * WHERE语句:SELECT * FROM tb_name WHERE id=3; * HAVING 语句:SELECT * FROM tb_name GROUP BY score HAVING count(*)>2 * 相关条件控制符:=、>、<、、IN(1,2,3......)、BETWEEN a AND b、NOT AND 、OR Linke()用法中 % 为匹配任意、 _ 匹配一个字符(可以是汉字)IS NULL 空值检测 * MySQL的正则表达式:SELECT * FROM tb_name WHERE name REGEXP '^[A-D]' //找出以A-D 为开头的name * */ } /* * 关闭连接 * */ public function close(){ $close = mysqli_close($this->_dbObj); if($close){ return true; }else{ return false; } } function __destruct(){ mysqli_close($this->_dbObj); }}
操作示例:
首先实例化此类,其中需要输入host(数据库地址)、user(数据库用户)、password(数据库用户密码)、database(数据库名称)此四种信息,进行数据库的连接,然后即可调用select_table()方法,其中传入数据表名,从而设置对指定表的操作,从而即可利用连贯操作进行相应数据的增删改查。 其中参数基本均支持字符串和数组两种形式。
include '/classes/db.php'; $db = new \Database('localhost', 'root', '901230', 'weixin'); //$db = new \mysqli('localhost','root','901230','weixin'); //$db->select_db('visitor'); //dump($db->error()); //$db->change_user('helen','901230'); $table = 'zyd_fuweng_user'; //dump($db->select_table_fields($table)); //dump($db->error()); $db->select_table($table); $param1 = '123'; $param2 = 'id>1,record>100'; $param3 = array(/*array('count'=>1,'openid'=>'123','record'=>'100'),array('count'=>2,'openid'=>'234','record'=>'200'),*/array('count' => 4, 'openid' => '456', 'record' => '500') ); $param4 = array('count' => 4, 'openid' => '456', 'record' => '500'); //dump($db->where('id=4')->save($param4)); dump($db->where('count=4')->delete()); die; dump($db->data($param3)->add()); dump(array_keys($param3)); dump(array_values($param3)); dump(implode(',', array_values($param3))); dump(implode(',', array_keys($param3))); dump($db->where($param2)->order('id')->limit(2)->find()); dump($db->options_handle($param1)); dump($db->options_handle($param2)); dump($db->options_handle($param3)); $array = array('id', 'count'); $num = '123'; if (is_string($num)) {echo 'true'; } dump($db->getField($array)); dump($db->select_table_fields($table)); /*$array = array('a','b'); $array1 = array(); dump($db->getField('a,b')); dump($db->getField($array)); dump($db->getField($array1)); dump($db->getField(''));*/ /*$str = ''; if(empty($str)){echo 'true'; }*/ /*$model = M('zyd_fuweng_user'); $res = $model->getField('create_time,count'); dump($res);*/ die; // $table = 'zyd_fuweng_user'; //选择指定的数据库,并返回其中全部信息 $table_msg = $db->select_table($table); //选择指定数据库,返回数据库的字段信息 $table_field_msg = $db->select_table_fields($table); //条件搜索,传入条件均为数据 $where = array('id' => 1 ); $data = array('headimgurl' => 'helen.jpg' ); dump($db->where($where)->field('field')); dump($table); /*$dbObj = new \mysqli('localhost','helen','901230','weixin','3306'); //$query = 'select * from zyd_fuweng_user'; $query = 'show fields from zyd_fuweng_user'; $tables = mysqli_query($dbObj,$query); //dump($tables); $count = $tables->num_rows; $arr = array(); for($i=0;$ifetch_assoc();//dump($row);array_push($arr,$row); } mysqli_free_result($tables); dump($arr); die; $query1 = 'select * from zyd_fuweng_user'; $table_msg = mysqli_query($dbObj,$query1); //输出查询结果 $num = $table_msg->num_rows; for($i=0;$ifetch_assoc();dump($row); } dump($dbObj); dump($tables); dump($table_msg); $res = mysqli_close($dbObj); dump($res);*/