CodingBingo commented on issue #12322:
URL: 
https://github.com/apache/shardingsphere/issues/12322#issuecomment-916277249


   In my opinion, in your code**courseRepository.save(course);**, if you don't 
assign a value for **userCardNo**, it will assign a null value for this column 
automatically;
   For ** QueryAssistedEncryptAlgorithm**, I think it does some design problem. 
I think the method
   ```
   String queryAssistedEncrypt(String plaintext);
   ```
   should be change to 
   ```
   String queryAssistedEncrypt(Object plainValue);
   ```
   so user can directly transfer plain value to the algorithm and decide how to 
process this value to generate assistant value. @tristaZero @strongduanmu 


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