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