<?php
class mysql extends PDO{
  public $server;
  public $database;
  public $user;
  public $password;
  public $sql;
  public function __construct($server,$database,$user,$password,$port=3306){
    $this->server = $server;
    $this->database = $database;
    $this->user = $user;
    $this->password = $password;
    parent::__construct(\"mysql:host=$server;port=$port;dbname=$database\",$user,$password);
    $this->query(\'SET NAMES utf8\');
  }
  public function drop($table){
    $sql = \'DROP TABLE \'.$table.\';\';
    $re = $this->query($sql);
    if($re){
      return true;
    }else{
      return false;
    }
  }
  public function insert($table,$name,$value=null){
    $sql = \"INSERT INTO \".$table.\'(\';
    if($value == null){
    $arrname = array_keys($name);
    $arrvalue = array_values($name);
    }else{
    $arrname = explode(\'|\', $name);
    $arrvalue = explode(\'|\', $value);
    }
    for($i=0;$i<count($arrname);$i++){
      if($i==count($arrname)-1){
        $sql = $sql.$arrname[$i];
      }else{
        $sql = $sql.$arrname[$i].\",\";
      }
    }
    $sql = $sql.\")VALUES(\";
    for($i=0;$i<count($arrvalue);$i++){
      if($i==count($arrvalue)-1){
        $sql = $sql.\"\'\".$arrvalue[$i].\"\'\";
      }else{
        $sql = $sql.\"\'\".$arrvalue[$i].\"\',\";
      }
    }
    $sql .=\");\";
    $re = $this->query($sql);
    if($re){
      return true;
    }else{
      return false;
    }
  }
  public function delete($table,$Conditionsname,$Conditionsvalue=null){
    if($Conditionsvalue!=null){
      $sql = \"DELETE FROM \".$table.\" WHERE \".$Conditionsname.\"=\'\".$Conditionsvalue.\"\';\";
    }else{
      $sql = \"DELETE FROM \".$table.\" WHERE \";
      $arrname = array_keys($Conditionsname);
      $arrvalue = array_values($Conditionsname);
      for($i=0;$i<count($arrname);$i++){
        if($i==count($arrname)-1){
          $sql.=$arrname[$i].\'=\'.\"\'\".$arrvalue[$i].\"\'\";
        }else{
          $sql.=$arrname[$i].\'=\'.\"\'\".$arrvalue[$i].\"\',\";
        }
      }
      $sql.=\';\';
    }
    $re = $this->query($sql);
    if($re){
      return true;
    }else{
      return false;
    }
  }
  public function select($table,$name,$Conditionsname,$Conditionsvalue=null){
    if($Conditionsvalue!=null){
      $sql = \"SELECT \".$name.\" FROM \".$table.\" WHERE \".$Conditionsname.\"=\'\".$Conditionsvalue.\"\';\";
    }else{
      $sql = \"SELECT \".$name.\" FROM \".$table.\" WHERE \";
      $arrname = array_keys($Conditionsname);
      $arrvalue = array_values($Conditionsname);
      for($i=0;$i<count($arrname);$i++){
        if($i==count($arrname)-1){
          $sql.=$arrname[$i].\'=\'.\"\'\".$arrvalue[$i].\"\'\";
        }else{
          $sql.=$arrname[$i].\'=\'.\"\'\".$arrvalue[$i].\"\' and \";
        }
      }
      $sql.=\';\';
    }
    $re = $this->query($sql);
    $row = $re->fetch();
    return $row[$name];
  }
  public function update($table,$name,$value,$Conditionsname,$Conditionsvalue=null){
    if($Conditionsvalue!=null){
      $sql = \"UPDATE \".$table.\" SET \".$name.\"= \'\".$value.\"\' WHERE \".$Conditionsname.\"=\'\".$Conditionsvalue.\"\';\";
    }else{
      $sql = \"UPDATE \".$table.\" SET \".$name.\"= \'\".$value.\"\' WHERE \";
      $arrname = array_keys($Conditionsname);
      $arrvalue = array_values($Conditionsname);
      for($i=0;$i<count($arrname);$i++){
        if($i==count($arrname)-1){
          $sql.=$arrname[$i].\'=\'.\"\'\".$arrvalue[$i].\"\'\";
        }else{
          $sql.=$arrname[$i].\'=\'.\"\'\".$arrvalue[$i].\"\' and \";
        }
      }
      $sql.=\';\';
    }
    $re = $this->query($sql);
    if($re){
      return true;
    }else{
      return false;
    }
  }
  public function group($table,$name){
    $sql = \"SELECT \".$name.\" FROM \".$table.\";\";
    $return = array();
    $re = $this->query($sql);
    while($row = $re->fetch(PDO::FETCH_ASSOC)){
      array_push($return,$row[$name]);
    }
    return $return;
  }
  public function fetchall($sql){
    $return = array();
    $re = $this->query($sql);
    while($row = $re->fetch(PDO::FETCH_ASSOC)){
      array_push($return,$row);
    }
    return $return;
  }
}