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  • mybatis实现插入数据是自动获取插入数据的ID值并封装到Bean对象中

    XML方式的配置实现插入数据是自动获取插入数据的ID值并封装到Bean对象中

     <insert id="add" parameterType="com.itheima.domain.User">
            <selectKey keyProperty="id" keyColumn="id"  order="AFTER" resultType="int">
                select last_insert_id()
            </selectKey>
            insert into user(username,birthday,sex,address)values (#{username},null,'男','xian')
        </insert>

    test测试

    Bean对象的id属性就不需要手动去set了 配置了上面的代码就会自动从数据库获取并封装到Bean的id属性中

    public static void main(String[] args) throws Exception {
    
            InputStream in = Resources.getResourceAsStream("mybatis.xml");
            SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
            SqlSessionFactory s = builder.build(in);
            SqlSession sqlSession = s.openSession();
    
            //通过SqlSession创建Dao接口的代理对象
            IUserDao userdao = sqlSession.getMapper(IUserDao.class);
    
            User uu = new User();
            uu.setUsername("hhaaaah2");
            System.out.println(uu+"保存前");
            userdao.add(uu);
            sqlSession.commit();
    
            System.out.println(uu+"保存后");

    坚持
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  • 原文地址:https://www.cnblogs.com/gaoSJ/p/13073623.html
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