配置系统变量
NLS_LANG：SIMPLIFIED CHINESE_CHINA.ZHS16GBK
TNS_ADMIN：D:\PLSQL Developer\instantclient_11_2\NETWORK\ADMIN
tnsnames.ora 文件
ORCL@IP =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST =
IP)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = 数据库名)
)
)
原文：http://www.cnblogs.com/mingf123/p/3736623.html