Detailed explanation of PHP encapsulation of Mysql operation class

The full version of the mysql operation class implemented by PHP has already been used, and this simplified version is a simplified version after modifying the full version. It is suitable for general PHP applications and can realize basic additions, deletions, modifications and queries. I feel good about operating and printing MYSQL errors. If the website application is not very powerful, it is enough to apply this MYSQL operation class. I hope to be helpful.

The Mysql simple operation class encapsulated by myself has been stuffed into the Ben framework and is written based on PDO. The code style is somewhat nonsensical. . .

mysql.class.php

<?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);
    $this->query(&#39;SET NAMES utf8&#39;);
  }
  public function drop($table){
    $sql = &#39;DROP TABLE &#39;.$table.&#39;;&#39;;
    $re = $this->query($sql);
    if($re){
      return true;
    }else{
      return false;
    }
  }
  public function insert($table,$name,$value=null){
    $sql = "INSERT INTO ".$table.&#39;(&#39;;
    if($value == null){
    $arrname = array_keys($name);
    $arrvalue = array_values($name);
    }else{
    $arrname = explode(&#39;|&#39;, $name);
    $arrvalue = explode(&#39;|&#39;, $value);
    }
    for($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 = $sql."&#39;".$arrvalue[$i]."&#39;";
      }else{
        $sql = $sql."&#39;".$arrvalue[$i]."&#39;,";
      }
    }
    $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 ".$Conditionsname."=&#39;".$Conditionsvalue."&#39;;";
    }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[$i].&#39;=&#39;."&#39;".$arrvalue[$i]."&#39;";
        }else{
          $sql.=$arrname[$i].&#39;=&#39;."&#39;".$arrvalue[$i]."&#39;,";
        }
      }
      $sql.=&#39;;&#39;;
    }
    $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."=&#39;".$Conditionsvalue."&#39;;";
    }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[$i].&#39;=&#39;."&#39;".$arrvalue[$i]."&#39;";
        }else{
          $sql.=$arrname[$i].&#39;=&#39;."&#39;".$arrvalue[$i]."&#39; and ";
        }
      }
      $sql.=&#39;;&#39;;
    }
    $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 ".$name."= &#39;".$value."&#39; WHERE ".$Conditionsname."=&#39;".$Conditionsvalue."&#39;;";
    }else{
      $sql = "UPDATE ".$table." SET ".$name."= &#39;".$value."&#39; WHERE ";
      $arrname = array_keys($Conditionsname);
      $arrvalue = array_values($Conditionsname);
      for($i=0;$i<count($arrname);$i++){
        if($i==count($arrname)-1){
          $sql.=$arrname[$i].&#39;=&#39;."&#39;".$arrvalue[$i]."&#39;";
        }else{
          $sql.=$arrname[$i].&#39;=&#39;."&#39;".$arrvalue[$i]."&#39; and ";
        }
      }
      $sql.=&#39;;&#39;;
    }
    $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;
  }
}

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