[GitHub] [shardingsphere] lanchengx opened a new issue #12568: When the transaction status is open and `schema` is specified, an exception will occur when executing `SELECT @@session.transaction_read_only;`

Sat, 18 Sep 2021 03:33:09 -0700 


lanchengx opened a new issue #12568:
URL: https://github.com/apache/shardingsphere/issues/12568


   **Steps to reproduce the behavior**
   
![image](https://user-images.githubusercontent.com/52209337/133885566-944da7a6-b08b-4de6-838e-3e99d60ee359.png)
   
   
   **Reason analyze** 
   
![image](https://user-images.githubusercontent.com/52209337/133885585-5566e6e3-3f03-4769-ae1f-b3955b614434.png)
   
   Even if the `schema` of the current connection exists, in order to ensure 
that the schema of the current connection must exist, this method is still 
called in some places. If the transaction is opened at this time, an exception 
will be thrown.
   
   In fact, there is a `schema` in the current connection, and this method will 
not change the `schema` in the connection.


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