add get insert id after insert

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (df75b98) 42.10% compared to head (ec30788) 42.23%.

Files	Patch %	Lines
include/mysql.hpp	77.41%	7 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #132 +/- ## ========================================== + Coverage 42.10% 42.23% +0.12% ========================================== Files 22 22 Lines 2978 2986 +8 ========================================== + Hits 1254 1261 +7 - Misses 1724 1725 +1 ```

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