pgsql engine: 在查询模式下启用只读事务，工单执行启用读写事务,避免在查询模式下被函数修改数据

[peixubin]

No description provided.

[request-info]

你好!感谢你反馈的问题/bug，但是你的描述好像是空的，我们需要你完整的信息，这样才能帮你解决问题 如果不知道怎么写，在新建issue的时候有若干个模板可供选择，祝好！

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.35%. Comparing base (69ddfd0) to head (8638d6b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
sql/engines/pgsql.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2855      +/-   ##
==========================================
- Coverage   78.37%   78.35%   -0.02%     
==========================================
  Files         124      124              
  Lines       17573    17580       +7     
==========================================
+ Hits        13773    13775       +2     
- Misses       3800     3805       +5     

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[peixubin]

pgsql中的自定义函数可以修改数据，并且使用select func()的形式执行，在SQL查询功能中如果不限制事务的读写模式，就会存在很大的数据风险。

[LeoQuote]

其实比较好的实践是查询的时候使用的账号只有读权限, 当然你的方案也很好