掌握Thinkphp3.2.0----连贯操作

1 //数组操作
2 $user = M(‘User‘);
3 var_dump($user->select( array(‘where‘=>‘id in (1,2,3,4)‘, ‘limit‘=>‘2‘,//不是连贯操作
4 ‘order‘=>‘date DESC‘)));
5 //CURD处理，CURD会在专门章节讲解
6 $user = M(‘User‘);
7 var_dump($user->where(‘id=1‘)->find());
8 var_dump($user->where(‘id=7‘)->delete());

 1 //倒序
 2 $user = M(‘User‘);
 3 $map[‘id‘] =  array(‘eq‘, 1);
 4 var_dump($user->order(‘id desc‘)->select()); //正序默认或 ASC
 5 //第二排序
 6 var_dump($user->order(‘id desc,email desc‘)->select());
 7 PS：先按 id 倒序，再按 email 倒序
 8 //数组形式防止字段和mysql关键字冲突
 9 $user = M(‘User‘);
10 $map[‘id‘] =  array(‘eq‘, 1);
11 var_dump($user->order( array(‘id‘=>‘DESC‘))->select());

 1 //只显示id和user两个字段
 2 $user = M(‘User‘);
 3 var_dump($user->field(‘id, user‘)->select());
 4 //使用SQL函数和别名
 5 $user = M(‘User‘);
 6 var_dump($user->field(‘SUM(id) as count, user‘)->select());
 7 //使用数组参数结合SQL函数
 8 $user = M(‘User‘);
 9 var_dump($user->field( array(‘id‘,‘LEFT(user,3)‘=>‘left_user‘))->sele
10 ct());
11 //获取所有字段
12 $user = M(‘User‘);
13 var_dump($user->field()->select()); //可以传入*号，或者省略方法
14 //用于写入
15 $user = M(‘User‘);
16 $user->field(‘user,email‘)->create(); //CURD 将在专门的章节学习

1 $user = M(‘User‘);
2 var_dump($user->limit(2)->select());
3 //分页查询
4 $user = M(‘User‘);
5 var_dump($user->limit(0,2)->select()); //2,2、,4,2

1 //page分页
2 $user = M(‘User‘);
3 var_dump($user->page(1,2)->select()); //2,2、3,2

 1 //切换数据表
 2 $user = M(‘User‘);
 3 var_dump($user->table(‘think_info‘)->select());
 4 //获取简化表名
 5 $user = M(‘User‘);
 6 var_dump($user->table(‘__USER__‘)->select()); //__INFO__尚可
 7 //多表查询
 8 $user = M(‘User‘);
 9 var_dump($user->field(‘a.id,b.id‘)->table(‘__USER__ a,__INFO__
10 b‘)->select());
11 //多表查询，使用数组形式避免关键字冲突
12 $user = M(‘User‘);
13 var_dump($user->field(‘a.id,b.id‘)->table( array(‘think_user‘=>‘a‘,
14 ‘think_info‘=>‘b‘))->select());

1 alias 用于设置数据表别名
2 //设置别名
3 $user = M(‘User‘);
4 var_dump($user->alias(‘a‘)->select());

1 //group 方法通常用于对结合函数统计的结果集分组。
2 //分组统计
3 $user = M(‘User‘);
4 var_dump($user->field(‘user,max(id)‘)->group(‘id‘)->select());

1 //having 方法一般用于配合 group 方法完成从分组的结果中再筛选数据。
2 //分组统计结合having
3 $user = M(‘User‘);
4 var_dump($user->field(‘user,max(id)‘)->group(‘id‘)->having(‘id>2‘)->
5 select());

1 //comment 方法用于对 SQL 语句进行注释
2 //SQL注释
3 $user = M(‘User‘);
4 var_dump($user->comment(‘所有用户‘)->select());

1 //join 方法用于多表的连接查询。
2 //JOIN多表关联，默认是INNER JOIN
3 $user = M(‘User‘);
4 var_dump($user->join(‘think_user ON think_info.id =
5 think_user.id‘)->select()); //__USER__和__INFO__代替
6 //RIGHT、LEFT、FULL
7 var_dump($user->join(‘think_user ON think_info.id =
8 think_user.id‘,‘RIGHT‘)->select());

1 //union 方法用于合并多个 SELECT 的结果集
2 //合并多个SELECT结果集
3 $user = M(‘User‘);
4 var_dump($user->union("SELECT * FROM think_info")->select());

1 //distinct 方法用于返回唯一不同的值
2 //返回不重复的列
3 $user = M(‘User‘);
4 var_dump($user->distinct( true)->field(‘user‘)->select());

1 //cache 用于查询缓存操作
2 //查询缓存，第二次读取缓存内容
3 $user = M(‘User‘);
4 var_dump($user->cache( true)->select());