浅谈PHP值mysql操作类

<?php

/**

 * created by phpstorm.

 * user: administrator

 * date: 2016/6/27

 * time: 18:55

 */

 

class mysqls{

 

  private $table; //表

  private $opt;

 

  public function __construct($host,$user,$pwd,$name,$table_names)

  {

    $this->db=new mysqli($host,$user,$pwd,$name); //数据库连接

 

    if(mysqli_connect_errno()){

      echo "数据库连接错误".mysqli_connect_errno();

      exit();

    }

    $this->db->query("set names utf8");

    $this->table=$table_names;

    $this->opt['field']="*";

    $this->opt['where']=$this->opt['order']=$this->opt['limit']=$this->opt['group']='';

//    var_dump($this->opt['where']);

    //$this->m($table_names);

 

  }

 

  //数据库连接

//  protected function m($table_name){

//    $this->db=new mysqli(dbhost,dbuser,dbpwd,dbname);

//

//    if(mysqli_connect_errno()){

//      echo "数据库连接错误".mysqli_connect_errno();

//      exit();

//    }

//    $this->db->query("set names utf8");

//    $this->table=$table_name;

//  }

 

  //表中的字段

 

  public function tbfield(){

    $desc=$this->db->query("desc {$this->table}");

    $fieldarr=array();

    while(($row=$desc->fetch_assoc())!=false){

      $fieldarr[]=$row['field'];

    }

    // var_dump($fieldarr);

    return $fieldarr;

  }

 

  //查询字段

  public function field($filed){

    //拆分字段

    $filedarr=is_string($filed)?explode(",",$filed):$filed;

    if(is_array($filedarr)){

      $filed='';

      foreach($filedarr as $v){

        $filed.="'".$v."'".",";

      }

    }

    //var_dump($filed);

    return rtrim($filed,",");

 

  }

 

  //判断字段是否存在

  public function isfield($fileds)

  {

    $filedarr=is_string($fileds)?explode(",",$fileds):$fileds;

    $tbfiled=$this->tbfield();

    //var_dump( $tbfiled);

    foreach($filedarr as $v){

      if(!in_array($v,$tbfiled)){

         echo "字段输入发错";

      }

    }

 

  }

  //条件语句

  public function where($where){

     $this->opt['where']=is_string($where)?" where {$where}":"不是字符串";

    return $this;

 

 

 

  }

  //limit

  public function limit($limit){

     $this->opt['limit']=is_string($limit)?" limit {$limit}":"不是字符串";

    return $this;

 

 

  }

  public function order($order){

     $this->opt['order']=is_string($order)?" order by {$order}":"不是字符串";

    return $this;

 

 

  }

  public function group($group){

    $this->opt['group']=is_string($group)?" group by {$group}":"不是字符串";

    return $this;

 

 

  }

 

  // 查询字符串

  public function select(){

    $sql="select * from {$this->table} {$this->opt['where']} {$this->opt['group']} {$this->opt['limit']} {$this->opt['order']}";

    return $this->fetch($sql);

  }

  //结果集查询

  public function fetch($sql){

    $result=$this->db->query($sql);

    $sqlarr=array();

    while(($row=$result->fetch_assoc())!=false){

      $sqlarr[]=$row;

    }

    // var_dump($sqlarr);

    return $sqlarr;

  }

  //无结果集查询

  public function querys($sql){

    $sqls=$this->db->query($sql);

    return $this->db->affected_rows;

  }

 

  //删除语句

  public function delete($where=array()){

    if($where=="" && empety($this->opt['where'])) die(" 不能为空");

    if($where!=""){

      if(is_array($where)){

        $where=implode(",",$where);

      }

      $this->opt['where']=" where id in({$where})";

    }

    $sql="delete from {$this->table} {$this->opt['where']} {$this->opt['limit']}";

    var_dump($sql);

    //return $this->query($sql);

  }

  //数组键名

  public function key($key){

    if(!is_array($key))die("非法数组");

    $keys="";

    foreach($key as $v){

      $keys.=$v.",";

 

    }

    return rtrim($keys,",");

  }

  //数组值

  public function value($value){

    if(!is_array($value))die("非法数组");

    $strvalue="";

    foreach($value as $v){

      $strvalue.="'".$v."'".",";

    }

    return rtrim($strvalue,",");

  }

 

  //添加语句

  public function add($filed){

    if(!is_array($filed)) die("非法数组");

    $fileds=$this->key(array_keys($filed)); //返回数组中的键名

    //var_dump($fileds);

    $values=$this->value(array_values($filed));

    $sql="insert into {$this->table}({$fileds})values($values)";

    //var_dump($sql);

    return $this->querys($sql);

  }

 

  //查找单条记录

  public function find($field,$id){

    $sql="select {$this->opt['field']} from {$this->table} {$this->where($field.'='."'".$id."'")}";

    var_dump($sql);

    return $this->fetch($sql);

 

  }

  //更新语句

  public function save($arrs){

    if(!is_array($arrs))die("非法的数组");

    //if(empty($this->opt['where']))die("条件不能为空");

    $str="";

    while(list($k,$v)=each($arrs))

    {

      $str="{$k}="."'{$v}',";

    }

    $str=rtrim($str,",");

    $sql="update {$this->table} set {$str}{$this->opt['where']}";

 

    return $this->querys($sql);

 

 

  }

  //获取总记录数

  public function counts(){

 

    $sql="select 'id' from {$this->table}{$this->opt['where']}";

    //var_dump($sql);

    return $this->querys($sql);

  }

 

 

}

 

$db=new mysqls('127.0.0.1','root','','mysql','user');