使用sqlplus连接数据库

方法1：

sqlplus sjtu/sjtu@'(description=(address_list=(address=(protocol=tcp)(host=192.168.0.77)(port=1521)))(connect_data=(service_name=SJTU)))'

 如下图所示：

方法2：

sqlplus  sjtu/sjtu@192.168.0.77:1521/SJTU  

如下图所示：

3.连接格式

方法1中的格式是固定的，我们在oralce的安装目录搜索tnsnames.ora.sample即可找到相应格式，如下列代码所示：

# This is a sample tnsnames.ora that contains the NET8 parameters that are
# needed to connect to an HS Agent

dg4odbc  =
  (DESCRIPTION=
    (ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))
    (CONNECT_DATA=(SID=dg4odbc))
    (HS=OK)
  ) 

4.以sysdba身份登录

C:\Users\xuwei>sqlplus /nolog

SQL> conn / as sysdba

SQL> select name from v$database;
NAME
---------
ORCL

SQL> select * from global_name;
GLOBAL_NAME
--------------
ORCL