fix null

[Jacyking]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 77.77% and project coverage change: +0.01% 🎉

Comparison is base (53ad6ef) 40.07% compared to head (9328562) 40.09%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   40.07%   40.09%   +0.01%     
==========================================
  Files          22       22              
  Lines        2852     2856       +4     
==========================================
+ Hits         1143     1145       +2     
- Misses       1709     1711       +2     

Files Changed	Coverage Δ
include/mysql.hpp	84.56% <75.00%> (-0.42%)	⬇️
tests/test_ormpp.cpp	94.52% <100.00%> (ø)

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[qicosmos]

LGTM