【ISSUE #12911】将for循环拼接的SQL语句改为Lambda表达式拼接，使得代码简洁清晰，并添加相关测试用例

[20144101037]

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Thanks for your this PR. 🙏
Please check again for your PR changes whether contains any usage/api/configuration change such as Add new API , Add new configuration, Change default value of configuration.
If so, please add or update documents(markdown type) in docs/next/ for repository nacos-group/nacos-group.github.io

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感谢您提交的PR。 🙏
请再次查看您的PR内容，确认是否包含任何使用方式/API/配置参数的变更，如：新增API、新增配置参数、修改默认配置等操作。
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.25%. Comparing base (4961191) to head (a8fb72f).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #12914   +/-   ##
==========================================
  Coverage      72.24%   72.25%           
+ Complexity      9916     9913    -3     
==========================================
  Files           1301     1301           
  Lines          41728    41718   -10     
  Branches        4395     4389    -6     
==========================================
- Hits           30147    30142    -5     
  Misses          9467     9467           
+ Partials        2114     2109    -5     

Files with missing lines	Coverage Δ
...nacos/plugin/datasource/mapper/AbstractMapper.java	91.04% <100.00%> (+4.79%)	⬆️

... and 2 files with indirect coverage changes

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[20144101037]

@KomachiSion Could this change be merged? Thank you.

[wuyfee]

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