Mybatis的@Param注解的作用，我个人感觉就俩作用：1.便于传多个参数；2.类似于别名之类的功能
- 1
1.便于传多个参数
dao层示例：
Public User selectUser(@param(“userName”) String name,
@param(“userpassword”) String password);
对应的mapper.xml
select * from user_user_t where user_name = #{userName} and user_password=#{userPassword}
不使用@Param注解时，参数只能有一个，而且是JavaBean，在sql中只能引用JavaBean的属性。
2.类似于别名之类的功能
数据库中字段为：user_name、user_password;
pojo类中字段为：name、password;
传参时别名字段为：userName,userPassword
本人才疏学浅，写这些是便于自己记住，有不足的地方请大佬指正，谢谢。
</div>
<link href="https://csdnimg.cn/release/phoenix/mdeditor/markdown_views-b6c3c6d139.css" rel="stylesheet">
<div class="more-toolbox">
<div class="left-toolbox">
<ul class="toolbox-list">
<li class="tool-item tool-active is-like "><a href="javascript:;"><svg class="icon" aria-hidden="true">
<use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#csdnc-thumbsup"></use>
</svg><span class="name">点赞</span>
<span class="count">1</span>
</a></li>
<li class="tool-item tool-active is-collection "><a href="javascript:;" data-report-click="{"mod":"popu_824"}"><svg class="icon" aria-hidden="true">
<use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-csdnc-Collection-G"></use>
</svg><span class="name">收藏</span></a></li>
<li class="tool-item tool-active is-share"><a href="javascript:;"><svg class="icon" aria-hidden="true">
<use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-csdnc-fenxiang"></use>
</svg>分享</a></li>
<!--打赏开始-->
<!--打赏结束-->
<li class="tool-item tool-more">
<a>
<svg t="1575545411852" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5717" xmlns:xlink="http://www.w3.org/1999/xlink" width="200" height="200"><defs><style type="text/css"></style></defs><path d="M179.176 499.222m-113.245 0a113.245 113.245 0 1 0 226.49 0 113.245 113.245 0 1 0-226.49 0Z" p-id="5718"></path><path d="M509.684 499.222m-113.245 0a113.245 113.245 0 1 0 226.49 0 113.245 113.245 0 1 0-226.49 0Z" p-id="5719"></path><path d="M846.175 499.222m-113.245 0a113.245 113.245 0 1 0 226.49 0 113.245 113.245 0 1 0-226.49 0Z" p-id="5720"></path></svg>
</a>
<ul class="more-box">
<li class="item"><a class="article-report">文章举报</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="person-messagebox">
<div class="left-message"><a href="https://blog.csdn.net/xxy275448403">
<img src="https://profile.csdnimg.cn/E/3/6/3_xxy275448403" class="avatar_pic" username="xxy275448403">
<img src="https://g.csdnimg.cn/static/user-reg-year/1x/2.png" class="user-years">
</a></div>
<div class="middle-message">
<div class="title"><span class="tit"><a href="https://blog.csdn.net/xxy275448403" data-report-click="{"mod":"popu_379"}" target="_blank">旺财你不是人</a></span>
</div>
<div class="text"><span>发布了4 篇原创文章</span> · <span>获赞 1</span> · <span>访问量 3889</span></div>
</div>
<div class="right-message">
<a href="https://im.csdn.net/im/main.html?userName=xxy275448403" target="_blank" class="btn btn-sm btn-red-hollow bt-button personal-letter">私信
</a>
<a class="btn btn-sm bt-button personal-watch" data-report-click="{"mod":"popu_379"}">关注</a>
</div>
</div>
</div>
Mybatis的@Param注解的作用，我个人感觉就俩作用：1.便于传多个参数；2.类似于别名之类的功能
- 1
1.便于传多个参数
dao层示例：
Public User selectUser(@param(“userName”) String name,
@param(“userpassword”) String password);
对应的mapper.xml
select * from user_user_t where user_name = #{userName} and user_password=#{userPassword}
不使用@Param注解时，参数只能有一个，而且是JavaBean，在sql中只能引用JavaBean的属性。
2.类似于别名之类的功能
数据库中字段为：user_name、user_password;
pojo类中字段为：name、password;
传参时别名字段为：userName,userPassword
本人才疏学浅，写这些是便于自己记住，有不足的地方请大佬指正，谢谢。
</div>
<link href="https://csdnimg.cn/release/phoenix/mdeditor/markdown_views-b6c3c6d139.css" rel="stylesheet">
<div class="more-toolbox">
<div class="left-toolbox">
<ul class="toolbox-list">
<li class="tool-item tool-active is-like "><a href="javascript:;"><svg class="icon" aria-hidden="true">
<use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#csdnc-thumbsup"></use>
</svg><span class="name">点赞</span>
<span class="count">1</span>
</a></li>
<li class="tool-item tool-active is-collection "><a href="javascript:;" data-report-click="{"mod":"popu_824"}"><svg class="icon" aria-hidden="true">
<use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-csdnc-Collection-G"></use>
</svg><span class="name">收藏</span></a></li>
<li class="tool-item tool-active is-share"><a href="javascript:;"><svg class="icon" aria-hidden="true">
<use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#icon-csdnc-fenxiang"></use>
</svg>分享</a></li>
<!--打赏开始-->
<!--打赏结束-->
<li class="tool-item tool-more">
<a>
<svg t="1575545411852" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5717" xmlns:xlink="http://www.w3.org/1999/xlink" width="200" height="200"><defs><style type="text/css"></style></defs><path d="M179.176 499.222m-113.245 0a113.245 113.245 0 1 0 226.49 0 113.245 113.245 0 1 0-226.49 0Z" p-id="5718"></path><path d="M509.684 499.222m-113.245 0a113.245 113.245 0 1 0 226.49 0 113.245 113.245 0 1 0-226.49 0Z" p-id="5719"></path><path d="M846.175 499.222m-113.245 0a113.245 113.245 0 1 0 226.49 0 113.245 113.245 0 1 0-226.49 0Z" p-id="5720"></path></svg>
</a>
<ul class="more-box">
<li class="item"><a class="article-report">文章举报</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="person-messagebox">
<div class="left-message"><a href="https://blog.csdn.net/xxy275448403">
<img src="https://profile.csdnimg.cn/E/3/6/3_xxy275448403" class="avatar_pic" username="xxy275448403">
<img src="https://g.csdnimg.cn/static/user-reg-year/1x/2.png" class="user-years">
</a></div>
<div class="middle-message">
<div class="title"><span class="tit"><a href="https://blog.csdn.net/xxy275448403" data-report-click="{"mod":"popu_379"}" target="_blank">旺财你不是人</a></span>
</div>
<div class="text"><span>发布了4 篇原创文章</span> · <span>获赞 1</span> · <span>访问量 3889</span></div>
</div>
<div class="right-message">
<a href="https://im.csdn.net/im/main.html?userName=xxy275448403" target="_blank" class="btn btn-sm btn-red-hollow bt-button personal-letter">私信
</a>
<a class="btn btn-sm bt-button personal-watch" data-report-click="{"mod":"popu_379"}">关注</a>
</div>
</div>
</div>
来源：CSDN
作者：别抢我蓝buff
链接：https://blog.csdn.net/qq_44813090/article/details/104141535