<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[Beyourselfsun的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/Beyourselfsun</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; Beyourselfsun]]></copyright><item><title><![CDATA[Oracle中VARCHAR和VARCHAR2的区别]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142210755</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142210755</guid><author>Beyourselfsun</author><pubDate>Fri, 13 Sep 2024 14:59:33 +0800</pubDate><description><![CDATA[Oracle中VARCHAR和VARCHAR2的区别
VARCHAR2

默认类型，VARCHAR2是Oracle中最常见的可变长度字符串类型
VARCHAR2不区分NULL和空字符串，这意味着NULL和空字符串在VARCHAR2类型中被视为相同的值
最大长度为4000字符（从Oracle 12c开始，最大长度增加到了32767字符）
VARCHAR2类型的列在没有数据时存储为空字符串，而不是NULL

VARCHAR

历史遗留，VARCHAR是Oracle早起版本中使用的类型，但现在主要用于兼容和未来的]]></description><category></category></item><item><title><![CDATA[Mysql临时表]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142185638</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142185638</guid><author>Beyourselfsun</author><pubDate>Thu, 12 Sep 2024 21:02:26 +0800</pubDate><description><![CDATA[MySQL临时表在我们需要保存一些临时数据时是非常有用的。临时表只在当前连接可见，当关闭连接时，MySQL会自动删除表并释放所有空间。在MySQL中，临时表是一种在当前会话中存在的表，它在会话结束时会自动被销毁。]]></description><category></category></item><item><title><![CDATA[Oracle临时表]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142185285</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142185285</guid><author>Beyourselfsun</author><pubDate>Thu, 12 Sep 2024 20:38:34 +0800</pubDate><description><![CDATA[主要用于存储临时数据，这些表的数据通常只在一个事务或会话期间有效。临时表对于处理大型批处理作业或存储中间结果特别有用，因为它们可以减少重做日志(redolog)的开销，并且不会污染永久表空间。]]></description><category></category></item><item><title><![CDATA[Maven常用标签及作用]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142095459</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/142095459</guid><author>Beyourselfsun</author><pubDate>Tue, 10 Sep 2024 14:26:32 +0800</pubDate><description><![CDATA[【代码】Maven常用标签及作用。]]></description><category></category></item><item><title><![CDATA[Docker]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/141017415</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/141017415</guid><author>Beyourselfsun</author><pubDate>Thu, 08 Aug 2024 10:07:51 +0800</pubDate><description><![CDATA[Docker是一个开源的应用容器引擎，基于Go语言并遵从Apache2.0协议开源。Docker可以让开发者打包他们的应用以及依赖包到一个轻量级、可移植的容器中，然后发布到Linux机器上，也可以实现虚拟化。容器是完全使用沙箱机制，相互之间不会有任何接口。Docker并非是一个通用的容器工具，它依赖于已存在并运行的Linux内核环境。Docker实质上是在已经运行的Linux下制造了一个隔离的文件环境，因此它执行的效率几乎等同于所部署的Linux主机。]]></description><category></category></item><item><title><![CDATA[docker是什么？和kubernetes(k8s)是什么关系？]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/139564480</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/139564480</guid><author>Beyourselfsun</author><pubDate>Sun, 09 Jun 2024 19:56:29 +0800</pubDate><description><![CDATA[docker是什么？和kubernetes(K8s)是什么关系]]></description><category></category></item><item><title><![CDATA[Nginx: 动静分离、压缩、缓存、黑白名单、跨域、高可用......]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/139029863</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/139029863</guid><author>Beyourselfsun</author><pubDate>Sat, 18 May 2024 19:41:07 +0800</pubDate><description><![CDATA[Nginx: 动静分离、压缩、缓存、黑白名单、跨域、高可用]]></description><category></category></item><item><title><![CDATA[Spring中的@Resource/@Autowired/@Primary/@Qualifier]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135215793</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135215793</guid><author>Beyourselfsun</author><pubDate>Tue, 26 Dec 2023 11:02:37 +0800</pubDate><description><![CDATA[Spring中的@Resource/@Autowired/@Primary/@Qualifier]]></description><category></category></item><item><title><![CDATA[git上传代码到新建的空白项目]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135199440</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135199440</guid><author>Beyourselfsun</author><pubDate>Mon, 25 Dec 2023 14:52:48 +0800</pubDate><description><![CDATA[git上传代码到新建的空白项目]]></description><category></category></item><item><title><![CDATA[RabbmitMQ基础]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135183258</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135183258</guid><author>Beyourselfsun</author><pubDate>Sun, 24 Dec 2023 17:59:19 +0800</pubDate><description><![CDATA[RabbmitMQ基础]]></description><category></category></item><item><title><![CDATA[文件上传、下载封装]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135172654</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135172654</guid><author>Beyourselfsun</author><pubDate>Sat, 23 Dec 2023 18:54:13 +0800</pubDate><description><![CDATA[【代码】文件上传、下载封装。]]></description><category></category></item><item><title><![CDATA[集合循环赋值封装]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135172341</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135172341</guid><author>Beyourselfsun</author><pubDate>Sat, 23 Dec 2023 18:27:12 +0800</pubDate><description><![CDATA[【代码】集合循环赋值封装。]]></description><category></category></item><item><title><![CDATA[基于Mybatis-Plus进行查询封装]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135172238</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/135172238</guid><author>Beyourselfsun</author><pubDate>Sat, 23 Dec 2023 18:14:38 +0800</pubDate><description><![CDATA[【代码】基于Mybatis-Plus进行查询封装。]]></description><category></category></item><item><title><![CDATA[java中BigDecimal除法运算指定小数点保留位数和取舍规则]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/132941450</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/132941450</guid><author>Beyourselfsun</author><pubDate>Sun, 17 Sep 2023 13:35:56 +0800</pubDate><description><![CDATA[java中BigDecimal除法运算指定小数点保留位数和取舍规则]]></description><category></category></item><item><title><![CDATA[JavaNIO基础]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130903791</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130903791</guid><author>Beyourselfsun</author><pubDate>Sat, 27 May 2023 17:38:38 +0800</pubDate><description><![CDATA[JavaNIO基础]]></description><category></category></item><item><title><![CDATA[JavaNIO群聊Demo]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130902522</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130902522</guid><author>Beyourselfsun</author><pubDate>Sat, 27 May 2023 17:26:53 +0800</pubDate><description><![CDATA[【代码】JavaNIO群聊Demo。]]></description><category></category></item><item><title><![CDATA[shell脚本]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459718</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459718</guid><author>Beyourselfsun</author><pubDate>Mon, 01 May 2023 22:44:37 +0800</pubDate><description><![CDATA[代表第一到第九个参数，十及十以上的参数，十以上的参数需要用大括号包含，如。这个变量也代表命令行中的所有参数，不过。这个变量代表命令行中的所有的参数，]]></description><category></category></item><item><title><![CDATA[Linux的目录结构]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459658</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459658</guid><author>Beyourselfsun</author><pubDate>Mon, 01 May 2023 22:36:17 +0800</pubDate><description><![CDATA[在Linux世界里，一切皆文件
硬件如显卡、cpu等都会映射成一个文件
具体的目录结构
/bin

是Binary的缩写，这个目录存放着最经常使用的命令


/sbin(/usr/sbin、/usr/local/sbin)

s就是Super User的意思，这里存放的是系统管理员使用的系统管理程序


/home

存放普通用户的主目录，在Linux中每个用户都有一个自己的目录，一般该目录是以用户的账号命名的


/root

该目录为系统管理员，也称作超级权限者的用户主目录


/boot

存放的是]]></description><category></category></item><item><title><![CDATA[Linux的运行级别]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459646</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459646</guid><author>Beyourselfsun</author><pubDate>Mon, 01 May 2023 22:34:38 +0800</pubDate><description><![CDATA[运行级别说明(共有0-6个运行级别)
0：关机
1：单用户(找回丢失密码)
2：多用户没有网络服务
3：多用户有网络服务
4：系统未使用保留给用户
5：图形界面
6：系统重启
常用运行级别是3和5，要修改默认的运行级别可修改文件/etc/inittab的id:5:initdefault:这一行中的数字。命令:init[0123456]


]]></description><category></category></item><item><title><![CDATA[Linux的常用指令]]></title><link>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459615</link><guid>https://blog.youkuaiyun.com/Beyourselfsun/article/details/130459615</guid><author>Beyourselfsun</author><pubDate>Mon, 01 May 2023 22:32:09 +0800</pubDate><description><![CDATA[输出重定向和>>追加。]]></description><category></category></item></channel></rss>