http://www.oracle.com/technetwork/cn/database/features/instant-client/index-092699-zhs.html
在官网下载对应的 Instant Client 包，解到 C:\ 。
运行以下批处理，即可。
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v ORACLE_HOME /t reg_sz /d "C:\instantclient_11_2" /f
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v TNS_ADMIN /t reg_sz /d "C:\instantclient_11_2" /f
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment" /v NLS_LANG /t reg_sz /d "SIMPLIFIED CHINESE_CHINA.ZHS16GBK" /f
REM tnsnames.ora
echo ORALOCAL = >C:\instantclient_11_2\tnsnames.ora
echo (DESCRIPTION = >>C:\instantclient_11_2\tnsnames.ora
echo (ADDRESS_LIST = >>C:\instantclient_11_2\tnsnames.ora
echo (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521)) >>C:\instantclient_11_2\tnsnames.ora
echo ) >>C:\instantclient_11_2\tnsnames.ora
echo (CONNECT_DATA = >>C:\instantclient_11_2\tnsnames.ora
echo (SERVER = DEDICATED) >>C:\instantclient_11_2\tnsnames.ora
echo (SERVICE_NAME = ORCL) >>C:\instantclient_11_2\tnsnames.ora
echo ) >>C:\instantclient_11_2\tnsnames.ora
echo ) >>C:\instantclient_11_2\tnsnames.ora