Mybatis连接数据库时报错原因归纳

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一：

报错信息

org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
The Connection descriptor used by the client was:
localhost:1521:oracl

### The error may exist in sqlMapper/UsersMapper.xml
### The error may involve test.findUserById
### The error occurred while executing a query
### Cause: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
The Connection descriptor used by the client was:
localhost:1521:oracl

这里报错的可能性在于配置文件中的jdbc.url=jdbc:oracle:thin:@localhost:1521:oracl的oracl不是Oracle数据库的SID，数据库的SID是orcl，所以会报这个错，可以通过服务查看Oracle的SID进行核对

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