php封装的mysqli类完整实例

本文实例讲述了php封装的mysqli类。分享给大家供大家参考，具体如下：

类：

host = $config['host'] ? $config['host'] : 'localhost';
    $this->port = $config['port'] ? $config['port'] : '3306';
    $this->user = $config['user'] ? $config['user'] : 'root';
    $this->pass = $config['pass'] ? $config['pass'] : 'root';
    $this->db = $config['db'] ? $config['db'] : 'small2';
    $this->charset=isset($arr['charset']) ? $arr['charset'] : 'utf8';
    //连接数据库
    $this->db_connect();
    //选择数据库
    $this->db_usedb();
    //设置字符集
    $this->db_charset();
   }
   //连接数据库
   private function db_connect(){
    $this->link=mysqli_connect($this->host.':'.$this->port,$this->user,$this->pass);
    if(!$this->link){
      echo "数据库连接失败
";
      echo "错误编码".mysqli_errno($this->link)."
";
      echo "错误信息".mysqli_error($this->link)."
";
      exit;
    }
   }
   //设置字符集
    private function db_charset(){
     mysqli_query($this->link,"set names {$this->charset}");
    }
    //选择数据库
   private function db_usedb(){
     mysqli_query($this->link,"use {$this->db}");
   }
   //私有的克隆
   private function __clone(){
     die('clone is not allowed');
   }
   //公用的静态方法
   public static function getIntance(){
     if(self::$dbcon==false){
      self::$dbcon=new self;
     }
     return self::$dbcon;
   }
   //执行sql语句的方法
    public function query($sql){
     $res=mysqli_query($this->link,$sql);
     if(!$res){
      echo "sql语句执行失败
";
      echo "错误编码是".mysqli_errno($this->link)."
";
      echo "错误信息是".mysqli_error($this->link)."
";
     }
     return $res;
   }
   //打印数据
    public function p($arr){
      echo "
";
      print_r($arr);
      echo "
";
    }
    public function v($arr){
    echo "
";
      var_dump($arr);
      echo "
";
    }
    //获得最后一条记录id
    public function getInsertid(){
     return mysqli_insert_id($this->link);
    }
   
    public function getOne($sql){
     $query=$this->query($sql);
      return mysqli_free_result($query);
    }
    //获取一行记录,return array 一维数组
    public function getRow($sql,$type="assoc"){
     $query=$this->query($sql);
     if(!in_array($type,array("assoc",'array',"row"))){
die("mysqli_query error");
     }
     $funcname="mysqli_fetch_".$type;
     return $funcname($query);
    }
    //获取一条记录,前置条件通过资源获取一条记录
    public function getFormSource($query,$type="assoc"){
    if(!in_array($type,array("assoc","array","row")))
    {
      die("mysqli_query error");
    }
    $funcname="mysqli_fetch_".$type;
    return $funcname($query);
    }
    //获取多条数据，二维数组
    public function getAll($sql){
     $query=$this->query($sql);
     $list=array();
     while ($r=$this->getFormSource($query)) {
      $list[]=$r;
     }
     return $list;
    }
     
     public function insert($table,$data){
     //遍历数组，得到每一个字段和字段的值
     $key_str='';
     $v_str='';
     foreach($data as $key=>$v){
      if(empty($v)){
die("error");
     }
 //$key的值是每一个字段s一个字段所对应的值
 $key_str.=$key.',';
 $v_str.="'$v',";
     }
     $key_str=trim($key_str,',');
     $v_str=trim($v_str,',');
     //判断数据是否为空
     $sql="insert into $table ($key_str) values ($v_str)";
     $this->query($sql);
    //返回上一次增加操做产生ID值
     return $this->getInsertid();
   }
   
    public function deleteOne($table, $where){
      if(is_array($where)){
 foreach ($where as $key => $val) {
   $condition = $key.'='.$val;
 }
      } else {
 $condition = $where;
      }
      $sql = "delete from $table where $condition";
      $this->query($sql);
      //返回受影响的行数
      return mysqli_affected_rows($this->link);
    }
    
    public function deleteAll($table, $where){
      if(is_array($where)){
 foreach ($where as $key => $val) {
   if(is_array($val)){
     $condition = $key.' in ('.implode(',', $val) .')';
   } else {
     $condition = $key. '=' .$val;
   }
 }
      } else {
 $condition = $where;
      }
      $sql = "delete from $table where $condition";
      $this->query($sql);
      //返回受影响的行数
      return mysqli_affected_rows($this->link);
    }
   
   public function update($table,$data,$where){
     //遍历数组，得到每一个字段和字段的值
     $str='';
    foreach($data as $key=>$v){
     $str.="$key='$v',";
    }
    $str=rtrim($str,',');
    //修改SQL语句
    $sql="update $table set $str where $where";
    $this->query($sql);
    //返回受影响的行数
    return mysqli_affected_rows($this->link);
   }
}
?>

用法测试：

//mysqli测试
$db=ConnectMysqli::getIntance();
//var_dump($db);



//$list=$db->insert("users",$_POST);
//$del=$db->deleteOne("users","id=29");
//$del=$db->deleteAll("users","id in(27,28)");
//$up=$db->update("users",$_POST,"id=27");
//print_R($list);

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php+mysqli数据库程序设计技巧总结》、《php面向对象程序设计入门教程》、《PHP数组(Array)操作技巧大全》、《PHP基本语法入门教程》、《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。