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## Bug Report
When i use the sharding-jdbc to batch insert sql in Oracle ,it gives me a exception.
But MySQL is OK.
### Which version of ShardingSphere did you use?
sharding 5.1.0
java 1.8
…
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### Cause: java.lang.NullPointerException
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectLis…
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使用dynamic-datasource和Druid连接TDengine，刚启动的时候没问题，10多分钟后再次查询就不行了，报下面的错误，能帮忙看看吗？
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception i…
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jdbc-url: java.util.concurrent.ExecutionException: org.apache.ibatis.exceptions.PersistenceException: java.sql.SQLException: Failed to connect to url : jdbc:mysql://127.0.0.1:3306/point?useUnicode=tru…
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Caused by: java.sql.SQLSyntaxErrorException: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'wk_open_finance.wk_finance_account_user.id' which is not function…
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大佬，[UpsertPlugin](https://github.com/itfsw/mybatis-generator-plugin/blob/5f91961a838b0cf594d9c03f992672ebfdcc9fc8/src/main/java/com/itfsw/mybatis/generator/plugins/UpsertPlugin.java#L422)里面如果用useGen…
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```
org.apache.ibatis.exceptions.PersistenceException:
### Error updating database. Cause: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
The last packet se…
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```
What version of the MyBatis.NET are you using?
ibatis.datamapper.1.6.2.
VS 2008
Please describe the problem. Unit tests are best!
Iam new to Ibatis....
Log file is not created at all after tryi…
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```
What version of the MyBatis.NET are you using?
ibatis.datamapper.1.6.2.
VS 2008
Please describe the problem. Unit tests are best!
Iam new to Ibatis....
Log file is not created at all after tryi…
-
```
What version of the MyBatis.NET are you using?
ibatis.datamapper.1.6.2.
VS 2008
Please describe the problem. Unit tests are best!
Iam new to Ibatis....
Log file is not created at all after tryi…