<"true");
   }else{
    echo json_encode("false");
   }
   //test
   //$test='{"keychartid":"2","keyid":"2","keychartname":"2","level":"2","showtype":"2","helptips":"2","keylevel":"2","ishmap":"2"}';
   //$a->insertData($test,'t_prekeychart');
  }
  if($key=='3')
  { 
   $prekey=$_REQUEST['keychartid'];
   $prekeyname='keychartname';
   if($a->delData($prekey,$prekeyname,'t_prekeychart'))
   {
    echo json_encode("true");
   }else{
    echo json_encode("false");
   }
  }
  if($key=='4')
  {
   $objectstr=$_REQUEST['object'];
   $prekeyname='keychartid';
   if($a->updData($objectstr,$prekeyname,'t_prekeychart'))
   {
    echo json_encode("true");
   }else{
    echo json_encode("false");
   }
  }
"htmlcode">

/*
   * 添加信息
   * @param:$objstr:json风格的数据库插入信息字符串
   *   $tablename:表名
   */
  function insertData($objstr,$tablename)
  {
    $dbc=$this->conData();
    if($dbc)
    { 
     $columnname=array();
     $columnname=$this->getColumns($tablename);
     //echo $columnname[0];
     $clos=implode(',',$columnname); //将列名数组转换为字符串
     //echo $clos;
     $data=json_decode($objstr,true); //将json格式的字符串转换为关联数组
     //echo $value['keychartname'];
     $values=array();
     foreach($columnname as $value)
     {
       //按照查询到的列名查询数据，数据为空的，赋值为NULL，防止数据库插入数值错位
       //echo $data[$value]."<br>";
       if(isset($data[$value]))
       {
         array_push($values,$data[$value]);
       }else{
        $data[$value]=NULL;
        array_push($value,$data[$value]);
       }
     }
     $strvalue=implode(',',$values);
     //echo $strvalue;
     /*
     * SQL： insert into $tablename($clos) values(...)
     */
     $sql=<<<SQL
     insert into $tablename($clos) values($strvalue);
SQL;
     //echo $sql;
     $res=mysqli_query($dbc,$sql);
     if($res)
     {
      return true;
     }else{
       return false;
     }
    }else{
      echo "连接错误!";
    } 
  }
/*
   *更新信息 
   *@param: $objstr:json风格的数据库更新信息字符串
   *   $tablename:表名
   *   $prekeyname:主键名  
   * */
  function updData($objstr,$prekeyname,$tablename)
  {
    $dbc=$this->conData();
    if($dbc)
    {
     $columnname=array();
     $columnname=$this->getColumns($tablename); 
     //$clos=implode(',',$columnname); //将列名数组转换为字符串
     $data=json_decode($objstr,true); //将json格式的字符串转换为关联数组
     $sets=array();
     foreach($columnname as $value)
     { 
      //列名不等于主键名获取值
      if($prekeyname!=$value)
      {
        //set $value=$data[$value];
        array_push($sets,"$value=$data[$value]");//接好的set语句部分
      }
     }
     //$sets数组转化为字符串
     $stringsets=implode(',',$sets);
     //echo $stringsets;
     /*
     * SQL:update $tablename set ..... where $prekeyname=$data[$prekeyname]; 
     * */
     $sql=<<<SQL
      update $tablename set $stringsets where $prekeyname=$data[$prekeyname];
SQL;
     $res=mysqli_query($dbc,$sql);
     if($res)
     {
      return true;
     }else{
      return false;
     }
    }else{
      echo "连接错误";
    }
  }
/*
   *获取表的所有列名
   *@param:$tablename:表名
   */
  function getColumns($tablename)
  { 
   $dbc=@mysqli_connect('localhost','root','1234','information_schema');
   if(!$dbc)
   {
    echo "Connect Error".mysqli_connect_error($dbc);
   }else
   {
    //连接成功,从表COLUMNS获取表的所有列名
    $sql="select COLUMN_NAME from columns where TABLE_NAME='$tablename'";
    $res=@mysqli_query($dbc,$sql);
    $items=array();
    if($res)
    {
     while($row=mysqli_fetch_array($res,MYSQLI_ASSOC))
     {
      $columnname=$row['COLUMN_NAME'];
      array_push($items,$columnname);
     }
    return $items;
    mysqli_close($dbc);
    }
    else{
     echo "查询失败，请检查SQL语句!";
     }
   }
  }




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