PLSQL连接oracle数据库

解压安装PL/SQL。首次不登录，点击cencel进入PL界面

点击Tools–>preference–>配置Oracle Home 和OCI library

其中Oracle Home路径匹配到tnsnames.ora文件夹，OCI library匹配到oci.dll文件

配置tnsnames.ora文件如下：

LISTENER_ORCL =
  ADDRESS = PROTOCOL = TCP)HOST = localhost)PORT = 1521))

ORACLR_CONNECTION_DATA =
  DESCRIPTION =
    ADDRESS_LIST =
      ADDRESS = PROTOCOL = IPC)KEY = EXTPROC1521))
    )
    CONNECT_DATA =
      SID = CLRExtProc)
      PRESENTATION = RO)
    )
  )

ORCL =
  DESCRIPTION =
    ADDRESS = PROTOCOL = TCP)HOST = localhost)PORT = 1521))
    CONNECT_DATA =
      SERVER = DEDICATED)
      SERVICE_NAME = orcl)
    )
  )

最后当登录窗口多了Connect as 下拉选框，说明配置成功

输入用户密码，和数据库名，数据库名必须与tnsnames.ora文件中配置的数据库名一致。如上配置的ORCL