[GitHub] [shardingsphere] lwtdev edited a comment on issue #7548: Throw NPE at ExecutionContextBuilder.getPrimaryKeyColumns when execute sql

[GitBox <gi...@apache.org>]

lwtdev edited a comment on issue #7548:
URL: https://github.com/apache/shardingsphere/issues/7548#issuecomment-696550564


   > Hi @lwtdev
   > Thanks for your detailed issue.
   > Firstly, I also wonder how you created the `customer` table, which will help position the problem.
   > Secondly, I have to say this is a band example of defensive programming. 😞
   
   Yes, This is not a good config example （And it was wrong...）.  it's was a example simplify from config as follow(in 4.x):
   ```yaml
         databaseStrategy:
           inline:
             shardingColumn: customer_id
             algorithmExpression: ds_${String.format("%02d",new BigDecimal(customer_id).abs().divideAndRemainder(4)[1].longValue().intdiv(2))}
         tableStrategy:
           inline:
             shardingColumn: customer_id
             algorithmExpression: customer_email_${String.format("%04d",new BigDecimal(customer_id).abs().divideAndRemainder(4)[1].longValue())}
   ```
   


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