MyBatis通过注解方式批量添加、修改、删除

1 public class User implements Serializable {
2     private Long     　id;     //用户ID
3     private String     name;   //用户姓名
4     private Integer    age;    //用户年龄
5     .......
6 }

1     @Insert("<script>"  +
2                 "insert into user(id, name, age) VALUES " +
3                 "<foreach collection=‘list‘ item=‘item‘ index=‘index‘ separator=‘,‘> " +
4                     "(#{item.id},#{item.name},#{item.age}) " +
5                 "</foreach>" +
6             "</script>")
7     void batchInsert(@Param("list")List<User> list); //批量添加用户

1     @Update({"<script>"  +
2                 "<foreach collection=‘list‘ item=‘item‘ index=‘index‘ open=‘(‘ separator=‘,‘ close=‘)‘> " +
3                     "update user set name= #{item.name}, age= #{item.age} " +
4                     "where id = #{item.id} " +
5                 "</foreach>" +
6             "</script>"})
7     void batchUpdate(@Param("list")List<User> list);//批量修改用户

 1     @Delete("<script>"  +
 2                 "delete from user where id in " +
 3                 "<foreach collection=‘array‘ item=‘id‘ open=‘(‘separator=‘,‘ close=‘)‘> " +
 4                     "#{id}" +
 5                 "</foreach>" +
 6             "</script>")
 7     void batchDelete(long[] ids);//批量删除用户
 8     
 9     //☆☆☆ 如何获取 long[] ids ？？？
10     //1、获取要删除用户的集合
11     List<User> user = userMapper.selectAll();//用的是tk.mybatis下获取所有用户
12     //2、根据集合获取 long[] ids
13          //朋友，如果你还在用遍历、创建数组等 SAO 操作.....你 OUT 了
14          //让我们看看jdk8的stream流是怎么搞的：
15         List<Long> idList = user.stream.map(User::getId).collect(Collectors.toList());//获取id集合     
16         long[] ids = idList.stream.mapToLong(i -> i).toArray();// 获的long[] ids
17        
18         就两步就实现了（其实就一步），它不香吗？？？