PHP uses ORM for database operations

composer require catfan/Medoo
composer update

<?php
      //使用Composer安装的这样引入
      //require &#39;vendor/autoload.php&#39;;
      // 直接下载的这样引入
      require_once &#39;medoo.php&#39;; 
      // 初始化
      $db = new medoo([    
                  &#39;database_type&#39; => &#39;mysql&#39;,    
                  &#39;database_name&#39; => &#39;test&#39;,    
                  &#39;server&#39; => &#39;localhost&#39;,    
                  &#39;username&#39; => &#39;root&#39;,    
                  &#39;password&#39; => &#39;123456&#39;,    
                  &#39;charset&#39; => &#39;utf8&#39;,    
                //可选：端口
                &#39;port&#39; => 3306, 
                //可选：表前缀
                &#39;prefix&#39; => &#39;&#39;, 
                // PDO驱动选项 http://www.php.net/manual/en/pdo.setattribute.php
                &#39;option&#39; => [ PDO::ATTR_CASE => PDO::CASE_NATURAL ]
      ]);

$database = new medoo([    'database_type' => 'sqlite',    'database_file' => 'my/database/path/database.db']);

select($table, $columns, $where) //获取所有记录
    - table [string] 表名
    - columns [string/array] 字段
    - where (可选) [array] 查询条件get($table, $columns, $where) //仅获取一条数据select($table, $join, $columns, $where)
    - table [string] 表名
    - join [array] 关联查询，如果没有可以忽略
    - columns [string/array] 字段
    - where (可选) [array] 查询条件

$user = $db->select('user', '*'); 
//返回所有数据
$user = $db->get('user', '*'); 
//返回一条数据
$user = $db->select('user','*', array('name ' => 'joy'));
$user = $db->select('user','name', array('age[>] ' => 20)); 
$user = $db->select(&#39;user&#39;,[&#39;name&#39;,&#39;age&#39;], array(&#39;age[<=] &#39; => 20));

insert($table, $data)

$db->insert('user', array('name'=> 't3', 'age'=>22)); //返回自增id

update($table, $data, $where)

$db->update('user', array('name'=> 't5'), array('id'=> 23)); //返回受影响的行数

delete($table, $where)

$db->update('user',  array('id'=> 23)); //返回受影响的行数

$db->has('user',  array('id'=> 23)); //记录是否存在
$db->count('user',  array('id[>]'=> 23));//统计
$db->max('user', 'age', array('gender'=> 1));//最大值
$db->min('user', 'age', array('gender'=> 2)); //最小值
$db->avg('user',  'age', array('gender'=> 2)); //平均值
$db->sum('user',  'age', array('gender'=> 2)); //求和

$db->action(function($db) {    
      try{
        $db->insert("account", [ "name" => "foo", "email" => "bar@abc.com" ]);
        $db->delete("account", [ "user_id" => 2312 ]);
    }catch(Exception $e){        
          // 返回false就会回滚事务
        return false;
    }
});

//查询
$data = $db->query("SELECT * FROM user")->fetchAll();
print_r($data);
//删除
$db->query("DELETE FROM user where name='t5' ");

$pdo = $db->pdo;

$stmt = $pdo->query('select * from user limit 2'); //返回一个PDOStatement对象
//$row = $stmt->fetch(); //从结果集中获取下一行，用于while循环
$rows = $stmt->fetchAll(); //获取所有
print_r($rows);

$pdo->beginTransaction();//开启事务处理
    try{//PDO预处理以及执行语句...
        $pdo->commit();//提交事务
    }catch(PDOException $e){
    $pdo->rollBack();//事务回滚
    //相关错误处理
    throw $e;
}

$user = $db->debug()->select('user', '*'); 
//SELECT "name","age" FROM "user" WHERE "age" <= 20

$db->select('user3', '*'); 
var_dump($db->error());

$db->select('user', '*'); 
var_dump($db->log());

$db->select('user', '*'); 
var_dump($db->last_query());