<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[HHSUVV的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/HHSUVV</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; HHSUVV]]></copyright><item><title><![CDATA[StringUtils--isEmpty、isBlank]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/84937137</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/84937137</guid><author>HHSUVV</author><pubDate>Mon, 10 Dec 2018 14:21:25 +0800</pubDate><description><![CDATA[isEmpty  和  isBlank



 isEmpty(str) 等价于 str == null || str.length == 0

 isBlank(str)  等价于 str == null || str.length == 0 || str.trim().length == 0
 

//同理


 isNotEmpty(str)等价于 str != null &amp;amp;&amp;amp...]]></description><category></category></item><item><title><![CDATA[MySql中将一个字段的值设置为主键ID的值]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/83964243</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/83964243</guid><author>HHSUVV</author><pubDate>Sun, 11 Nov 2018 23:38:56 +0800</pubDate><description><![CDATA[相当于把一列的数据复制给另一列


语法 ：UPDATE 表名 SET 需要数据的列名 = 被复制的列名

例：
      UPDATE d_inspection SET sortno = id 

需要注意：需要数据的那一列的长度应大于等于 被复制那一列的长度，还有两列的数据类型保持一致...]]></description><category></category></item><item><title><![CDATA[自己配的Spring事务]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/83421927</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/83421927</guid><author>HHSUVV</author><pubDate>Fri, 26 Oct 2018 23:01:22 +0800</pubDate><description><![CDATA[applicationContext-trans.xml


&amp;lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&amp;gt;
&amp;lt;beans xmlns=&quot;http://www.springframework.org/schema/beans&quot;
	xmlns:context=&quot;http://www.springframework.org/schema/context&quot;...]]></description><category></category></item><item><title><![CDATA[MySQL数据库  表  记录操作]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/83421756</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/83421756</guid><author>HHSUVV</author><pubDate>Fri, 26 Oct 2018 22:44:48 +0800</pubDate><description><![CDATA[1.表操作 

创建表之前先选择数据库:use 某个数据库
【创建表】
语法:
    create table 表名 (
         字段名 类型(长度) 约束,
         字段名 类型(长度) 约束,
         字段名 类型(长度) 约束
    );

【表的查看】查看数据库中有哪些表：show tables;
查看表结构:desc 表名;

【表的删除】表的删除:dr...]]></description><category></category></item><item><title><![CDATA[JSON解析]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/83119610</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/83119610</guid><author>HHSUVV</author><pubDate>Wed, 17 Oct 2018 23:12:39 +0800</pubDate><description><![CDATA[[]转]点我看详细解析]]></description><category></category></item><item><title><![CDATA[org.springframework.dao.InvalidDataAccessApiUsageException: Write operations are not allowed in read]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/81316857</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/81316857</guid><author>HHSUVV</author><pubDate>Tue, 31 Jul 2018 17:21:43 +0800</pubDate><description><![CDATA[在整合ssh三大框架过程的  遇到了如下异常,在csdn上找了相关的博客还是没有解决,最后发现是声明式事务的method值写成了dao层的方法;

method的值为声明式事务管理的 方法!!

method的值为声明式事务管理的 方法!!

method的值为声明式事务管理的 方法!!

org.springframework.dao.InvalidDataAccessApiUsageExcep...]]></description><category></category></item><item><title><![CDATA[struts2简单的自定义interceptor拦截器入门]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/81032466</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/81032466</guid><author>HHSUVV</author><pubDate>Fri, 13 Jul 2018 15:33:54 +0800</pubDate><description><![CDATA[interceptor拦截器可以对请求在到达Action之前的做出一些预处理,也就是到达Action之前干一些事我们都知道很多网站都有这样的限制,如某宝,只有用户登录了才能查看自己的购物车,订单,收藏夹等,视频网站也会要求你登录以后才能下载视频或文件,就像优快云需要你登录才能下载资料.那么网站是如何知道你有没有登录,又是如何限制用户下载的呢?本文通过简单的案例来入门struts2简单的自定义in...]]></description><category></category></item><item><title><![CDATA[初识脏读、不可重复读、幻读]]></title><link>https://blog.youkuaiyun.com/HHSUVV/article/details/80739001</link><guid>https://blog.youkuaiyun.com/HHSUVV/article/details/80739001</guid><author>HHSUVV</author><pubDate>Tue, 19 Jun 2018 22:05:25 +0800</pubDate><description><![CDATA[I . 脏读：一个事务读到另一个事务未提交的数据，导致多次查询的结果不一致；以转账为例 ，mysql数据库的默认隔离级别为 repeatable read,此隔离级别可以避免脏读和不可重复读，为了演示产生脏读，开启两个A、B两个窗口，进行A事务和B事务。1.在A 窗口中将隔离级别设置为 red uncommited ,  B窗口不变，默认为repeatable read;2.假设张三有 100块 ...]]></description><category></category></item></channel></rss>