<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[Tmm1026的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/Tmm1026</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; Tmm1026]]></copyright><item><title><![CDATA[Linux卸载OPENJDK安装指定JDK]]></title><link>https://blog.youkuaiyun.com/Tmm1026/article/details/104945986</link><guid>https://blog.youkuaiyun.com/Tmm1026/article/details/104945986</guid><author>Tmm1026</author><pubDate>Wed, 18 Mar 2020 15:44:25 +0800</pubDate><description><![CDATA[Linux自带OpenJDK，与开发常用的Oracle有所区别（区别之微妙另见大佬见解），但是你一定不希望在本地跑得好好的程序部署完嗝屁了，换成一致的JDK是个不错的选择。
1.查看OpenJDK
rpm -qa|grep java

一般会发现两个版本，发现几个卸载几个。
2.卸载OpenJDK
卸载所有版本
rpm -e --nodeps java-1.7.0-openjdk-1.7.0.10...]]></description><category></category></item><item><title><![CDATA[Linux开放端口]]></title><link>https://blog.youkuaiyun.com/Tmm1026/article/details/104944277</link><guid>https://blog.youkuaiyun.com/Tmm1026/article/details/104944277</guid><author>Tmm1026</author><pubDate>Wed, 18 Mar 2020 15:05:10 +0800</pubDate><description><![CDATA[CentOS开放指定端口
1.开启防火墙
systemctl start firewalld

2.添加需开放端口
firewall-cmd --zone=public --add-port=8080/tcp --permanent

3.重启防火墙
firewall-cmd --reload

4.验证下是否成功开放
netstat -ntlp

当然，也可直接修改防火墙配置文件 /etc/sy...]]></description><category></category></item><item><title><![CDATA[Oracle树形结构数据查询]]></title><link>https://blog.youkuaiyun.com/Tmm1026/article/details/104894958</link><guid>https://blog.youkuaiyun.com/Tmm1026/article/details/104894958</guid><author>Tmm1026</author><pubDate>Mon, 16 Mar 2020 11:13:56 +0800</pubDate><description><![CDATA[Oracle树形结构数据查询
有一天我想要由一个父节点把它和它的所有子节点一级一级的全部查出来，那么可以这么查：
SELECT * from NODE_TABLE t 
START WITH t.node_id = 'N96' 
CONNECT BY PRIOR node_id = parent_node_id;

查询结果：

歪瑞完美！

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