服务器重启后，数据库登录信息为空
错误信息：
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(Not logged on) - PL/SQL Developer
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Initialization error
Could not initialize "D:\app\Administrator\product\11.2.0\dbhome_1\bin\oci.dll"
Make sure you have the 32 bits Oracle Client installed.
OCIDLL forced to D:\app\Administrator\product\11.2.0\dbhome_1\bin\oci.dll
LoadLibrary(D:\app\Administrator\product\11.2.0\dbhome_1\bin\oci.dll) returned 0
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OK
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环境：win7 64位
PL/SQL Developer： Version 11.0.3.1770
解决方案
1. 从 http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html下载Oracle Client Package。 我下载的是Instant Client for Microsoft Windows (32-bit) 【instantclient-basiclite-nt-11.2.0.2.0.zip -》（instantclient_12_1.zip）】
2. 将 instantclient-basiclite-nt-11.2.0.2.0.zip 解压至 F:\instantclient_12_1 所在目录为：F:\instantclient_12_1
3. 启动PL/SQL Developer ，点击“取消”不要登录，菜单 --> Tools --> Perferences --> Connection 修改 Oracle_Home 和 OCI Library 的配置：
OracleHome: D:\app\Administrator\product\11.2.0\dbhome_1 （orcle 所在的安装目录）
OCI library: F:\instantclient_12_1\oci.dll （解压的目录）
4.apply -》OK -》重启
