namespace中的包名要和Dao/mapper接口的包名一致!
选择，查询语句；
1.编写接口
//根据id查询用户 User getUserById(int id);
2.编写对应的mapper.xml中的sql语句
<select id="getUserById" parameterType="int" resultType="com.kuang.pojo.User">
select * from mybatis.user where id = #{id}
</select>
3.测试
@Test
public void getUserLike(){
SqlSession sqlSession = MybatisUtils.getSqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> userList = mapper.getUserLike("李");
for (User user : userList) {
System.out.println(user);
}
sqlSession.close();
}
<!--对象中的属性，可以直接取出来-->
<insert id="addUser" parameterType="com.kuang.pojo.User">
insert into mybatis.user (id,name,pwd) values (#{id},#{name},#{pwd});
</insert>
<update id="updateUser" parameterType="com.kuang.pojo.User">
update mybatis.user set name = #{name},pwd=#{pwd} where id = #{id};
</update>
<delete id="deleteUser" parameterType="int">
delete from mybatis.user where id = #{id};
</delete>
注意点：
增删改需要提交事务(sqlSession.commit())
