Mybatis新增save結束后自動返回主鍵id

 <!-- 插入數據:返回記錄主鍵id值 -->
<insert id="insert" useGeneratedKeys="true" keyProperty="id"  keyColumn="id">
        insert  into stu (name,age) values (#{name},#{age})
</insert>

https://www.cnblogs.com/charlypage/p/11253610.html

https://blog.csdn.net/xy405580364/article/details/102837263

注：並不是返回的數據里獲取id，而是添加的對象里添加成功后會自動添加id