<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[ppsylspp的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/ppsylspp</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; ppsylspp]]></copyright><item><title><![CDATA[eclipse相关]]></title><link>https://blog.youkuaiyun.com/ppsylspp/article/details/83073329</link><guid>https://blog.youkuaiyun.com/ppsylspp/article/details/83073329</guid><author>ppsylspp</author><pubDate>Tue, 16 Oct 2018 11:57:51 +0800</pubDate><description><![CDATA[1. eclipse打不开，

报错：faild to find a main class in org.eclipse.equinox.launcher_1.4.0.v20161219-1356

记事本打开eclipse中的eclipse.ini：

jdk的没找见@@？

–launcher.defaultAction 
openFile 

后面添加
-vm 
D:\Java\jdk1.8...]]></description><category></category></item><item><title><![CDATA[运行javac:javac不是内部或外部命令，但是运行java、java-version正常]]></title><link>https://blog.youkuaiyun.com/ppsylspp/article/details/80879750</link><guid>https://blog.youkuaiyun.com/ppsylspp/article/details/80879750</guid><author>ppsylspp</author><pubDate>Mon, 02 Jul 2018 08:55:18 +0800</pubDate><description><![CDATA[这种情况应该是环境变量没配好，去对照检查：JAVA_HOME放的jdk绝对路径：D:\Java\jdk1.8.0_171classpath是：.;%JAVA_HOME%\lib\dt.jar;%JAVA_home%\lib\tools.jarpath在前面添加的:\%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;额，前面都对，把path改成在后面添加：；\%JAVA_HOM...]]></description><category></category></item><item><title><![CDATA[几个SQL函数]]></title><link>https://blog.youkuaiyun.com/ppsylspp/article/details/79562869</link><guid>https://blog.youkuaiyun.com/ppsylspp/article/details/79562869</guid><author>ppsylspp</author><pubDate>Thu, 15 Mar 2018 08:50:24 +0800</pubDate><description><![CDATA[字符连接：concat() 字符连接，并实现行列转换[在plsql中]： wmsys.wm_concat() :      e.g:select time,name,to_char(wmsys.wm_concat(itemname)) AS item 
        from dba_users
        group by time,name    --用to_char可避免出现&amp;lt;c...]]></description><category></category></item><item><title><![CDATA[MySQL数据库基础]]></title><link>https://blog.youkuaiyun.com/ppsylspp/article/details/79551901</link><guid>https://blog.youkuaiyun.com/ppsylspp/article/details/79551901</guid><author>ppsylspp</author><pubDate>Wed, 14 Mar 2018 11:15:14 +0800</pubDate><description><![CDATA[mysql常用数据类型：    整数：    tinyint: 一个字节（-128~-127）                smallint: 两个字节              int:    四个字节              bigint：八个字节    定点数:   decimal(p,s): 数据精度得到保证， （p此数字所占总位数，s此数字小数部分位数）实际可表示的字节和double...]]></description><category></category></item></channel></rss>