mybatis学习笔记-实现添加修改删除用户功能

<!-- 添加用户 --><!-- parameterType:指定输入参数类型是pojo --><!-- #{}中指定pojo的属性名，接收到pojo对象的属性值，mybatis通过OGNL获取对象属性值 --><insert id="insertUser" parameterType="sys.mybatis.pojo.User">insert intouser(username,birthday,sex,address)value(#{username},#{birthday},#{sex},#{address})</insert><!-- 添加用户，自动返回主键方式一 --><insert id="insertUser1" parameterType="sys.mybatis.pojo.User"><!-- 自动返回主键方式一：将插入数据的主键返回，返回到user对象中 SELECT LAST_INSERT_ID()：得到刚insert进去记录的主键值，只适用与自增主键keyProperty：将查询到主键值设置到parameterType指定的对象的哪个属性 order：SELECT LAST_INSERT_ID()执行顺序，相对于insert语句来说它的执行顺序resultType：指定SELECT LAST_INSERT_ID()的结果类型 --><selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">SELECTLAST_INSERT_ID()</selectKey>insert into user(username,birthday,sex,address)value(#{username},#{birthday},#{sex},#{address})</insert><!-- 添加用户，自动返回主键方式二 --><insert id="insertUser2" parameterType="sys.mybatis.pojo.User"><!-- 使用mysql的uuid（）生成主键 执行过程： 首先通过uuid()得到主键，将主键设置到user对象的id属性中 其次在insert执行时，从user对象中取出id属性值 --><selectKey keyProperty="id" order="BEFORE" resultType="java.lang.String">SELECT uuid()</selectKey>insert into user(id,username,birthday,sex,address)value(#{id},#{username},#{birthday},#{sex},#{address})</insert><!-- 添加用户，自动返回主键方式三 --><insert id="insertUser3" parameterType="sys.mybatis.pojo.User"useGeneratedKeys="true" keyProperty="id">insert intouser(username,birthday,sex,address)value(#{username},#{birthday},#{sex},#{address})</insert><!-- 修改用户 --><update id="updateUser" parameterType="sys.mybatis.pojo.User">update user set username =#{username},birthday=#{birthday},sex=#{sex},address=#{address} whereid=#{id}</update><!-- 删除用户 --><delete id="deleteUser" parameterType="java.lang.Integer">delete from user where id=#{value}</delete>

@Testpublic void insertUserTest() throws IOException {SqlSession sqlSession = null;try {String resource = "SqlMapConfig.xml";InputStream inputStream = Resources.getResourceAsStream(resource);SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);sqlSession = sessionFactory.openSession();User user = new User();user.setUsername("小君");user.setBirthday(new Date());user.setSex("1");user.setAddress("河北");sqlSession.insert("test.insertUser1", user);sqlSession.commit();// 返回主键System.out.println(user.getId());} catch (Exception e) {System.out.println(e);e.printStackTrace();} finally {if (sqlSession != null) {// 释放资源sqlSession.close();}}}@Testpublic void updateUserTest() throws IOException {SqlSession sqlSession = null;try {String resource = "SqlMapConfig.xml";InputStream inputStream = Resources.getResourceAsStream(resource);SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);sqlSession = sessionFactory.openSession();User user = new User();// 修改必须指定主键IDuser.setId(10);user.setUsername("小君");user.setBirthday(new Date());user.setSex("1");user.setAddress("河北");sqlSession.update("test.updateUser", user);sqlSession.commit();} catch (Exception e) {System.out.println(e);e.printStackTrace();} finally {if (sqlSession != null) {// 释放资源sqlSession.close();}}}@Testpublic void deleteUserTest() throws IOException {SqlSession sqlSession = null;try {String resource = "SqlMapConfig.xml";InputStream inputStream = Resources.getResourceAsStream(resource);SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);sqlSession = sessionFactory.openSession();sqlSession.delete("test.deleteUser", 16);sqlSession.commit();} catch (Exception e) {System.out.println(e);e.printStackTrace();} finally {if (sqlSession != null) {// 释放资源sqlSession.close();}}}