使用MyBatis(七)使用java注解完成CRUD

1.修改UserMapper

注意：

 List<User> selectAllUser();

这个必须写成泛型里面具体的User类型。

package com.yw.test05;import java.util.List;import org.apache.ibatis.annotations.Delete;import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Select;import org.apache.ibatis.annotations.Update;public interface UserMapper{    @Select("SELECT * FROM user WHERE id = #{id}")    User selectUser(int id);        @Select("select * from user")    List<User> selectAllUser();        @Insert("insert into user(name,age) values(#{name},#{age})")    void insertUser(User u);        @Update("update user set name=#{name} ,age=#{age} where id=#{id}")    void updateUser(User u);        @Delete("delete from user where id=#{id}")    void deleteUser(int id);}

2.修改测试类