https://ruby-china.org/lichcnpul Less is more, more is more en-us <p>现有一数据库表 random，表结构如下：</p> <table class="table table-bordered table-striped"> <tbody><tr> <th>字段</th> <th>user_id</th> <th>code</th> </tr> <tr> <td>类型</td> <td>bigInt</td> <td>varchar(64)</td> </tr> </tbody></table> <hr> <p>其中 user_id 是唯一索引，现在需要生成 code，code 是字符串类型，同样要求唯一。那么如何根据 user_id 来生成随机字符串呢？</p> <p>数据表示例如下：</p> <table class="table table-bordered table-striped"> <tbody><tr> <th>字段</th> <th>user_id</th> <th>code</th> </tr> <tr> <td></td> <td>12345782</td> <td>"待定"</td> </tr> <tr> <td></td> <td>12345793</td> <td>"待定"</td> </tr> <tr> <td></td> <td>...</td> <td>...</td> </tr> </tbody></table> <hr> <p>【问题补充】</p> <p>经过参考网上这篇文章：<a href="http://www.blogjava.net/BearRui/archive/2010/10/19/unique_random_code.html" rel="nofollow" target="_blank" title="">产生唯一随机码的方法分析</a>，但是仍然觉得产生的方法不够自然啊 QwQ</p> lichcnpul Fri, 29 Apr 2016 17:17:16 +0800 https://ruby-china.org/topics/29884 https://ruby-china.org/topics/29884