[Issue#12569] Enhance is exist table logic to support more database.

[huangkemingyyds]

Fixes #12569

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.65%. Comparing base (209dfe8) to head (6a76e84).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #12582      +/-   ##
=============================================
+ Coverage      69.63%   69.65%   +0.02%     
- Complexity      9399     9419      +20     
=============================================
  Files           1275     1275              
  Lines          41161    41226      +65     
  Branches        4366     4373       +7     
=============================================
+ Hits           28663    28717      +54     
- Misses         10422    10428       +6     
- Partials        2076     2081       +5     

Files with missing lines	Coverage Δ
...epository/EmbeddedNamespacePersistServiceImpl.java	100.00% <100.00%> (ø)
...epository/ExternalNamespacePersistServiceImpl.java	100.00% <100.00%> (ø)

... and 18 files with indirect coverage changes

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[KomachiSion]

直接改成Count(*)整张表会不会有性能问题？

[KomachiSion]

看了下 应该只有启动的时候执行一次，应该还好。