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class="channel_top_line"><div class="cn_t_l"></div><div class="cn_t_r"></div></div><div class="article_channel_info">当前位置: <a href="/article/list/1">article</a> > 正文 </div></div><div class="article_title"><h1>订单防重（幂等性）_幂等性和支付订单防重复</h1></div><div class="article_info"><div class="article_c_info"> 作者：凡人多烦事01 | 2024-03-14 13:10:07</div><div class="article_click" style="width: 140px;"><p class="operation-b-img operation-b-img-active"><i class="img-up txclick" attc="upclick" attn="0"></i><span class="num"> 赞</span></p><p class="operation-b-img operation-b-img-active"><i class="img-down txclick" attc="downclick" attn="0"></i><span class="num">踩</span></p></div></div><div class="article_intro">幂等性和支付订单防重复</div><div class="article_content article_contentheight"> <link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/kdoc_html_views-1a98987dfd.css"> <link rel="stylesheet" href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/ck_htmledit_views-044f2cf1dc.css"> <div id="content_views" class="markdown_views prism-atom-one-dark"> <svg xmlns="http://www.w3.org/2000/svg" style="display: none;"> <path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"></path> </svg> <p><strong>幂等性需要唯一的业务订单号来保证，插入类接口</strong></p> <h3><a name="t0"></a><a id="_2"></a>情况一：并发+单表</h3> <pre data-index="0" class="set-code-show prettyprint"><code class="has-numbering" onclick="mdcp.signin(event)" style="position: unset;"> 1.先select后insert——>再参数校验是否支付过——>在执行支付；缺点：1多一次select，高并发下性能低； 2.由于是两个操作，不具备原子性，存在事务问题，需要加@Transaction 2.乐观锁只适合update类接口； sql如下 <div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li></ul></pre> <pre data-index="1" class="set-code-show prettyprint"><code class="has-numbering" onclick="mdcp.signin(event)" style="position: unset;"> <update id="updateByLock" parameterType="com.example.demo.dal.domain.User"> update t_g7_test <set> <if test="age != null"> age=#{age,jdbcType=INTEGER}, </if> state=1 </set> where id=#{id} and state=0 </update> <div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li><li style="color: rgb(153, 153, 153);">11</li></ul></pre> <pre data-index="2" class="set-code-show prettyprint"><code class="has-numbering" onclick="mdcp.signin(event)" style="position: unset;"> 3.mysql唯一索引 4.利用redis的原子性实现分布式锁将orderID作为key，setnx成功这进行insert/update， 5.或者支付系统使用uuid-生成token响应给订单系统，并把token放在redis中，订单系统依据此token来实现 <div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li></ul></pre> <p>情况一：并发+分库分表</p> <pre data-index="3" class="set-code-show prettyprint"><code class="has-numbering" onclick="mdcp.signin(event)" style="position: unset;"> 这里就不光要考虑集群高并发了，还需要路由策略，将orderID经过hash保证每次落到同一个表中；比如Mycat配置路由算法函数 <schema name="lyz" checkSQLschema="false" sqlMaxLimit="100"> <table name="travelrecord" dataNode="dn1,dn2,dn3" rule="auto-sharding-long"></table> </schema> <tableRule name="auto-sharding-long"> <rule> <columns>id</columns> <algorithm>rang-long</algorithm> </rule> </tableRule> <div class="hljs-button signin active" data-title="登录复制" data-report-click="{"spm":"1001.2101.3001.4334"}"></div></code><ul class="pre-numbering" style=""><li style="color: rgb(153, 153, 153);">1</li><li style="color: rgb(153, 153, 153);">2</li><li style="color: rgb(153, 153, 153);">3</li><li style="color: rgb(153, 153, 153);">4</li><li style="color: rgb(153, 153, 153);">5</li><li style="color: rgb(153, 153, 153);">6</li><li style="color: rgb(153, 153, 153);">7</li><li style="color: rgb(153, 153, 153);">8</li><li style="color: rgb(153, 153, 153);">9</li><li style="color: rgb(153, 153, 153);">10</li><li style="color: rgb(153, 153, 153);">11</li><li style="color: rgb(153, 153, 153);">12</li></ul></pre> </div><div data-report-view="{"mod":"1585297308_001","spm":"1001.2101.3001.6548","dest":"https://blog.csdn.net/weixin_42752859/article/details/88033260","extend1":"pc","ab":"new"}"><div></div></div> <link href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/editerView/markdown_views-f23dff6052.css" rel="stylesheet"> <link href="https://csdnimg.cn/release/blogv2/dist/mdeditor/css/style-c216769e99.css" rel="stylesheet"> <div><div><span>声明：</span>本文内容由网友自发贡献，不代表【wpsshop博客】立场，版权归原作者所有，本站不承担相应法律责任。如您发现有侵权的内容，请联系我们。转载请注明出处：<a href="https://www.wpsshop.cn/w/凡人多烦事01/article/detail/234682">https://www.wpsshop.cn/w/凡人多烦事01/article/detail/234682</a></div></div></div><div class="article_recommend"><div class="list_top">推荐阅读</div><div class="ListItems"><ul class="NewsList"><li><div class="NewTitle"><a title="article" class="cat" href="/article/list/1" target="_blank">article<i></i></a><a title="Linux基础环境开发工具的使用(yum,vim,gcc,g++)_yum g++" 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