自己封装的Mysql简易操作类

 
<?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;
    }
}