写在前面：其实sqlplus也是很好的工具，只是sqldeveloper可以让我们更直观，当然还有很多工具，比如说PL/sql等等
sqldeveloper也是位于开始菜单中Oracle选项下的，具体位置见下图：
直接打开实际上是打不开的，会有下面出现的问题：
解决办法非常简单，点击“浏览”，然后定位到这你的Oracle数据库安装路径
C:\app\oracle\product\11.2.0\dbhome_1\sqldeveloper\sqldeveloper\bin
你可能与我的Oracle数据库安装位置有所差别，但是Oracle文件路径是一致的。
然后找到这个，并打开
紧接着会提示你这个：
这是因为这个工具是基于jdk 32位的，所以需要jdk32位的环境
点击“browse”去找到jdk32位的安装包
一般情况下到这里就可以直接打开了，但是笔者的环境还有点问题，出现了这个错误：
通过Google迅速找到了这样的一个链接：
https://stackoverflow.com/questions/22929702/oracle-sql-developer-msvcr100-dll-is-missing-from-your-computer
然后照着这个的回答就可以完美解决了
These information is specified in ORACLE_HOME\sqldeveloper\releasenotes . So install the jdk1.6 and make the sqldeveloper.conf SetJavaHome point to this.
other workaround is go to jdk1.7.0 installed path jdk1.7.0\jre\bin copy msvcr100.dll and paste it into ORACLE_HOME\sqldeveloper\sqldeveloper\bin and again try start sql Developer. It will start.
And The file is from
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Installation instructions:
Extract the .dll file from .zip file. We recommend that you extract the .dll to the installation directory of the program that is requesting the .dll.
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C:\Windows\System32 (Windows XP,Vista,7,win 8)
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Open Windows Start menu and select “Run…”.
Type CMD and press Enter (or if you use Windows ME,type COMMAND)).
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