keep pg mysql sqlite the same

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (0303216) 39.95% compared to head (34687c6) 39.88%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #124 +/- ## ========================================== - Coverage 39.95% 39.88% -0.08% ========================================== Files 22 22 Lines 2868 2856 -12 ========================================== - Hits 1146 1139 -7 + Misses 1722 1717 -5 ``` | [Files](https://app.codecov.io/gh/qicosmos/ormpp/pull/124?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qicosmos) | Coverage Δ | | |---|---|---| | [include/utility.hpp](https://app.codecov.io/gh/qicosmos/ormpp/pull/124?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qicosmos#diff-aW5jbHVkZS91dGlsaXR5LmhwcA==) | `98.70% <ø> (+0.80%)` | :arrow_up: | | [tests/test\_ormpp.cpp](https://app.codecov.io/gh/qicosmos/ormpp/pull/124?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qicosmos#diff-dGVzdHMvdGVzdF9vcm1wcC5jcHA=) | `95.38% <100.00%> (+0.16%)` | :arrow_up: | | [include/mysql.hpp](https://app.codecov.io/gh/qicosmos/ormpp/pull/124?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qicosmos#diff-aW5jbHVkZS9teXNxbC5ocHA=) | `81.67% <88.23%> (+1.18%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/qicosmos/ormpp/pull/124/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qicosmos)

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