免安装Oracle运行pl/sql developer

1, 从http://www.oracle.com/technology/software/tech/oci/instantclient/htdocs/winsoft.html中 下载：instantclient-basic-win32-10.1.0.5-20060419.zip.

2,在磁盘创建上目录，解压过去，最终解压文件会在同一个目录下。比如解压到D:\oracle_client

3,在目录D:\oracle_client下创建文件tnsnames.ora 内容如下
      oracledata =
           (DESCRIPTION =
             (ADDRESS_LIST =
               (ADDRESS = (PROTOCOL = TCP)(HOST = oracle数据库安装机器的IP)(PORT = 1521))
             )
             (CONNECT_DATA =
               (SERVICE_NAME = yourSID   )
             )
           )
4、配置环境变量，在PATH变量中加入D:\oracle_client
5、注册表加入下面键值    

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment]

"LD_LIBRARY_PATH"="D:\oracle_client"

"NLS_LANG"="AMERICAN_AMERICA.ZHS16GBK"

"TNS_ADMIN"="D:\oracle_client"

6,设置pl/sql Developer的perference，主要填二个文本框   OCI Library:“D:\oracle_client\oci.dll”, Oracle_home: "D:\oracle_client\"

完成

中文乱码问题解决：
在电脑->属性->高级->环境变量->系统变量中新建：
变量名：NLS_LANG
变量值：AMERICAN_AMERICA.ZHS16GBK