一：字符串条件查询

1.   //直接实例化Model
2.   $user=M('user1');
3.   var_dump($user->where ('id=1 OR age=55')->select())

   二：使用索引数组作为查询条件

   1. $user=M('user1'); 
   2. $condition['age']='55';
   3.  $condition['name']='zs';
   4.  // 索引数组查询的默认逻辑关系是 AND，如果想改变为 OR，可以使用_logic 定义查询逻辑
   5.  $condition['_logic'] = 'OR';
   6.  var_dump($user->where($condition)->select());
   7. 组合查询
   1. //字符串查询(_string)
   2.  $user = M('user1');
   3. $map['name'] = array('eq', 'zs');
   4.  $map['_string'] ='age="30" AND email="[email protected]"';
   5.  var_dump($user->where($map)->select());
   6.  //请求字符串查询(_query)
   7.  $user = M('user1');
   8.  $map['id'] = array('eq', "1");
   9.  $map['_query'] ='name=zs&[email protected]&_logic=OR';
   10.  var_dump($user->where($map)->select());
   11.  //复合查询(_complex)
   12.  $user = M('user1');
   13.  $where['name'] = array('like', 'z');
   14.  $where['id'] = 1;
   15.  $where['_logic'] = 'OR';
   16.  $map['_complex'] = $where;
   17.  $map['id'] = 3;
   18.  $map['_logic'] = 'OR';
   19.  var_dump($user->where($map)->select());