1 <insert id="insert" keyProperty="id" useGeneratedKeys="true"? parameterType="com.demo.domain.User">?
2 insert into User_t(name,age,addr) values(#{name},#{age},#{addr})
3 </insert>

/**
在service中獲取 在controller中不起作用(大坑)
**/

public int insert(User user) {
        int insertNum = Integer.parseInt(userMapper.insert(user) + "");
        Long id = user.getId();//該對象的自增ID
        return id;
    }

mybatis返回自增主鍵問題踩坑