:“ORA-12514: TNS:listener does not currently know of service requested in connect descriptor”错误

TNS:listener does not currently know of service requested in connect descriptor”
翻译：TNS:侦听器当前不知道连接描述符中请求的服务”

我的连接字符串（正确的）：

ConnectionString = "User Id = hlzljc;Password = hlzljc;Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=orcl.79.36.24))))";

这串字符串有几个要自己定义的地方，id和password就不说了，问题大概率出现在最后面那个括号的SERVICE_NAME那里，这里的字符要怎么写？

打开配置文件tnsnames.ora查看相应的监听配置，最后一行的SERVICE_NAME的orcl.79.36.24就是要填在字符串SERVICE_NAME=后面的。而且，看下图第一行代码，我用到的实例是ORCL，每个人不一样，看你要用的那个库属于哪个实例，不要死记找ORCL，看具体情况。

看数据库实例名网上教程很多，不赘述了。

然后tnsname.ora文件怎么找网上说得乱七八糟的，我说个靠谱一点的方法，下载一个PLSQL软件，连上你的数据库，进入软件后，找到帮助点进去

帮助里面有个支持信息

点开，找到圈起来的路径，就是存放地址

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:“ORA-12514: TNS:listener does not currently know of service requested in connect descriptor”错误

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