Instant Client下载地址：http://www.oracle.com/technetwork/database/database-technologies/instant-client/downloads/index.html

把下载的instantclient-basic-windows.x64-12.2.0.1.0.zip压缩包解压，放到D:/Oracle /instantclient_12_2 目录下。

在“环境变量”的“系统变量”中增加：

1. ORACLE_HOME = D:/Oracle/instantclient_12_2
2. TNS_ADMIN = D:/Oracle/instantclient_12_2
3. NLS_LANG = SIMPLIFIED CHINESE_CHINA.ZHS16GBK

修改Path变量，在后面添加 $ORACLE_HOME$

新建tnsnames.ora文件。

# tnsnames.ora Network Configuration File: C:/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora

# Generated by Oracle configuration tools.
ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )