fix set_last_error when use insert interface

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: +0.09 :tada:

Comparison is base (abbe81f) 36.98% compared to head (08e4720) 37.07%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #98 +/- ## ========================================== + Coverage 36.98% 37.07% +0.09% ========================================== Files 12 12 Lines 2850 2851 +1 ========================================== + Hits 1054 1057 +3 + Misses 1796 1794 -2 ``` | [Impacted Files](https://app.codecov.io/gh/qicosmos/ormpp/pull/98?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qicosmos) | Coverage Δ | | |---|---|---| | [include/mysql.hpp](https://app.codecov.io/gh/qicosmos/ormpp/pull/98?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qicosmos#diff-aW5jbHVkZS9teXNxbC5ocHA=) | `82.89% <50.00%> (+0.71%)` | :arrow_up: |

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[qicosmos]

调整一下格式。

[qicosmos]

看下我的评论，改一下。