Mysql sql语句自动拼接方法

<?php

/*燕十八 公益PHP培训  

课堂地址:YY频道88354001  

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class Mysql{

            //拼接sql语句

        public function autoExecute($data='',$table,$mode = "insert",$where = "where 1 limit 1"){        

            //insert 和 update 语句需要传入数组判断

            if(is_array($data)){

                //Update语句的拼接

                if($mode == "update"){

                    $sql="update $table set ";

                    foreach($data as $key=>$val){

                        $sql.=$key ." = "."'$val'".',';

                    }

                    //循环后语句是$sql updata $table set filed1 = value1,filed2=value2,filed3=values3,

                    $sql=substr(trim($sql),0,-1).' '.$where;

                     //先将sql语句的首位空格去掉,然后将后面的','给去掉拼接$where条件

                     return $this->query($sql);

                }

                    //insert 语句的拼接,默认是insert

                    $sql = $mode . " into ".$table ." ( " . implode(',',array_keys($data));

                    $sql.=" ) value "."('".implode("','",array_values($data))."')";

                    return $this->query($sql);

            

            }else{

                    //delete 语句的拼接

                    //当语句为delete时候,此时$data传入是表名,$table传入的是delete $mode传入是where条件

                    if($table = 'delete'){

                        $sql="delete from ".$data.' '.$mode;

                        $this->query($sql);

                        return $this->affected_rows();                    

                    }else{

                            return false;

                    }

            }

        }



        //query方法

        public function query($sql){

            $res = mysql_query($sql);

            return $res;

        }

    }

        //+++++++++++++++自动拼接sql语句使用方法+++++++++++++++++++//



        $mysql = new Mysql();

        //insert 语句

        $data=array(

            'username'=>'demo',

            'password'=>'admin'

        );

        $mysql->autoExecute($data,'user表');



        //updata 语句

        $where = "where id > 10;";

        $mysql->autoExecute($data,'user表','update',$where);

        

        //delete 语句

        $mysql->autoExecute('user表','delete',$where);