[GitHub] [skywalking] candyleer opened a new pull request #2803: Fix Mysql 6.x plugin

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

candyleer opened a new pull request #2803: Fix Mysql 6.x plugin
URL: https://github.com/apache/skywalking/pull/2803
 
 
   Please answer these questions before submitting pull request
   
   - Why submit this pull request?
   - [x] Bug fix
   - [ ] New feature provided
   - [ ] Improve performance
   
   - Related issues
   #2797 
   ___
   ### Bug fix
   - Bug description.
   
   - How to fix?
   make it works like 8.x plugin and make it compatible with all 6.x versions and all mode, like replication, loadbalance, failover and single model.
   By enhace `ConnectionImpl.getInstance()` method.
   
   and optimize some NPE may occur.
   
   ___
   ### New feature or improvement
   - Describe the details and related test reports.
   

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