mybatis利用注解实现增删改查

public interface UserMapper {

@Insert("insert into users(name, age) values(#{name}, #{age})")
public int add(Users user);

@Delete("delete from users where id = #{id}")
public int deleteById(int id);

@Update("update users set name = #{name}, age = #{age} where id = #{id}")
public int update(Users user);

@Select("select * from users where id = #{id}")
public Users getUserById(int id);

@Select("select * from users")
public List<Users> getAllUsers();
}

public interface UserMapper {
@Select("select * from blog_db.user where id=#{id}")
@Results(
{
@Result(id = true, column = "id", property = "id"),
@Result(column = "name", property = "name"),
@Result(column = "email", property = "email"),
@Result(column = "password", property = "password")
})
User findById(int id);
@Insert("INSERT INTO blog_db.user (name, email, password) " +
"VALUES (#{name}, #{email}, #{password} )")
@Options(useGeneratedKeys=true, keyProperty="id")
void insertUser1(User user);
@Insert("INSERT INTO blog_db.user (name, email, password) " +
"VALUES ( #{user.name}, #{user.email}, CONCAT(#{user.password}, #{passwordSuffix}) )")
void insertUser2(@Param("user")User user, @Param("passwordSuffix")String passwordSuffix);
}