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本文实例讲述了PHP基于ORM方式操作MySQL数据库。分享给大家供大家参考,具体如下:

ORM----Oriented Relationship Mapper,即用面向对象的方式来操作数据库。归根结底,还是对于SQL语句的封装。

首先,我们的数据库有如下一张表:

PHP基于ORM方式操作MySQL数据库实例

我们希望能够对这张表,利用setUserid("11111"),即可以设置userid;getUserid()既可以获得对象的userid。所以,我们需要建立model对象,与数据库中的表对应。

由于每张表所对应的model都应该是有set/get操作,所以,我们用一个父类BasicModel进行定义。其他model都是继承至这个model。

BasicModel的代码如下:

<"htmlcode">
<"BasicModel.php");
  class TbUser extends BasicModel{
  }
"htmlcode">
<"htmlcode">
<"IBasicDAO.php");
  class BasicDAO implements IBasicDAO{
    protected $modelName = null;
    private $tableName = null;
    private $h = "localhost";
    private $user = "root";
    private $pass = "root";
    private $db = "db_toilet";
    //获得连接
    public function getConnection(){
      $conn = mysqli_connect($this->h,$this->user,$this->pass,$this->db);
      return $conn;
    }
    //初始化
    public function init() {
      //根据model的名字得到表的名字
      $this->tableName = strtolower(substr($this->modelName,0,2))."_".strtolower(substr($this->modelName,2));
    }
    //获得一个表的列名
    public function getColumn($tableName) {
      $sql = "show columns from ".$tableName;
      $conn = $this->getConnection();
      $columns = array();
      if($conn!=null){
        $rtn = mysqli_query($conn,$sql);
        while($rtn!==false&&($row=mysqli_fetch_array($rtn))!=null){
          $columns[] = $row[0];
        }
        mysqli_close($conn);
      }
      return $columns;
    }
    //条件查询
    public function findByWhere($where){
      //获得数据表的列名
      $columns = $this->getColumn($this->tableName);
      //拼接sql语句
      $sql = "select * from ".$this->tableName." where ".$where;
      $conn = $this->getConnection();
      $arr = array();
      if($conn!=null){
        $rtn = mysqli_query($conn,$sql);
        while($rtn!==false&&($row=mysqli_fetch_array($rtn))!=null){
          $index = -1;
          $obj = new $this->modelName();
          foreach($columns as $column){
            $obj->{"set".ucfirst($column)}($row[++$index]);
          }
          $arr[] = $obj;
        }
        mysqli_close($conn);
      }
      return $arr;
    }
    //分页查询;支持排序
    public function findWhereOrderBy($where,$order,$start=null,$limit=null){
      //获得数据表的列名
      $columns = $this->getColumn($this->tableName);
      //拼接sql语句
      $sql = "select * from ".$this->tableName." where ".$where." order by ".$order;
      if($start!=null&&$limit!=null){
        $sql .= "limit ".$start.",".$limit;
      }
      $conn = $this->getConnection();
      $arr = array();
      if($conn!=null){
        $rtn = mysqli_query($conn,$sql);
        while($rtn!==false&&($row=mysqli_fetch_array($rtn))!=null){
          $index = -1;
          $obj = new $this->modelName();
          foreach($columns as $column){
            $obj->{"set".ucfirst($column)}($row[++$index]);
          }
          $arr[] = $obj;
        }
        mysqli_close($conn);
      }
      return $arr;
    }
    //保存操作
    public function save($obj){
      $columns = $this->getColumn($this->tableName);
      $conn = $this->getConnection();
      $tag = false;
      if($conn!=null){
        $sql = "insert into ".$this->tableName."(";
        foreach($columns as $column){
          $sql .= $column.",";
        }
        $sql = substr($sql,0,strlen($sql)-1).") values(";
        foreach($columns as $column){
          $value = $obj->{"get".ucfirst($column)}();
          //判断$value的类型
          if($value==null){
            $sql .= "null,";
          }else if(preg_match("/^[0-9]*$/", $value)){
            //是数字
            $sql .= $value.",";
          }else{
            $sql .= "'".$value."',";
          }
        }
        $sql = substr($sql,0,strlen($sql)-1);
        $sql .= ")";
        //执行sql语句
        mysqli_query($conn,$sql);
        $tag = true;
        mysqli_close($conn);
      }
      return $tag;
    }
    //删除操作
    public function delete($obj){
      $conn = $this->getConnection();
      $tag = false;
      if($conn!=null){
        $sql = "delete from ".$this->tableName." where ";
        $columns = $this->getColumn($this->tableName);
        $value = $obj->{"get".ucfirst($columns[0])}();
        if($value!=null){
          //是数字
          if(preg_match("/^[0-9]*$/", $value)){
            $sql .= $columns[0]."=".$value;
          }else{
            $sql .= $columns[0]."='".$value."'";
          }
          //执行
          mysqli_query($conn,$sql);
          $tag = true;
        }
        mysqli_close($conn);
      }
      return $tag;
    }
    //更新操作
    public function update($obj){
      $conn = $this->getConnection();
      $columns = $this->getColumn($this->tableName);
      $tag = false;
      if($conn!=null){
        $sql = "update ".$this->tableName." set ";
        for($i=1;$i<count($columns);$i++){
          $column = $columns[$i];
          $value = $obj->{"get".ucfirst($columns[$i])}();
          if($value==null){
            $sql .= $column."=null,";
          }else if(preg_match("/^[0-9]*$/",$value)){
            $sql .= $column."=".$value.",";
          }else{
            $sql .= $column."='".$value."',";
          }
        }
        $sql = substr($sql,0,strlen($sql)-1);
        $sql .= " where ";
        $tempColumn = $columns[0];
        $tempValue = $obj->{"get".ucfirst($columns[0])}();
        if(preg_match("/^[0-9]*$/", $tempValue)){
          $sql .= $tempColumn."=".$tempValue;
        }else{
          $sql .= $tempColumn."='".$tempValue."'";
        }
        //执行操作
        mysqli_query($conn,$sql);
        $tag = true;
        mysqli_close($conn);
      }
      return $tag;
    }
  }
"TbUser",代码就得知操作的表为tb_user,然后就可以进行一系列操作了。

<"BasicDAO.php");
  require_once("../model/TbUser.php");
  class TbUserDAO extends BasicDAO{
    function TbUserDAO(){
      $this->modelName = 'TbUser';
      parent::init();
    }
  }
"htmlcode">
$tbUserDAO = new TbUserDAO();
$tbUser = new TbUser();
$tbUser->setUserid("fetchingsoft@163.com");
$tbUser->setUsername("fetching");
$tbUserDAO->update($tbUser);
echo "执行成功!";
print_r($list);

这样对数据库中的记录进行更新。

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希望本文所述对大家PHP程序设计有所帮助。

标签:
PHP,ORM,操作,MySQL,数据库

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