Oracle之PL/SQL登录Oracle数据库 报错ORA-12154:TNS:无法解析指定的连接标识符

首先安装了Oracle之后，使用sqlplus可以登录得上账号system/root,而使用PL/SQL登录会报错，即

接着点击OK则报错：

或者：

 

 

 建议根据这两个文件改下基本就可以了：

如安装oracle路径下的listener.ora文件：

D:\soft_install_route\oracle_install\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora配置如：

# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = ORCL)
      (ORACLE_HOME = D:\soft_install_route\oracle_install\product\11.2.0\dbhome_1)
      
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
  )
ADR_BASE_LISTENER = D:\soft_install_route\oracle_install

　　安装oracle路径下的tnsnames.ora文件：

# tnsnames.ora Network Configuration File: D:\soft_install_route\oracle_install\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.

HUNDSUN =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = hundsun)
    )
  )

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

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )