Removed the deprecated execution API

[anarthal]

close #250

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.37%. Comparing base (7eec495) to head (8d028fd).

Additional details and impacted files

[](https://app.codecov.io/gh/boostorg/mysql/pull/251?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) ```diff @@ Coverage Diff @@ ## develop #251 +/- ## =========================================== + Coverage 98.35% 98.37% +0.01% =========================================== Files 129 129 Lines 6370 6325 -45 =========================================== - Hits 6265 6222 -43 + Misses 105 103 -2 ``` | [Files](https://app.codecov.io/gh/boostorg/mysql/pull/251?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) | Coverage Δ | | |---|---|---| | [include/boost/mysql/connection.hpp](https://app.codecov.io/gh/boostorg/mysql/pull/251?src=pr&el=tree&filepath=include%2Fboost%2Fmysql%2Fconnection.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg#diff-aW5jbHVkZS9ib29zdC9teXNxbC9jb25uZWN0aW9uLmhwcA==) | `100.00% <ø> (+0.94%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/boostorg/mysql/pull/251/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/boostorg/mysql/pull/251?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/boostorg/mysql/pull/251?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). Last update [7eec495...8d028fd](https://app.codecov.io/gh/boostorg/mysql/pull/251?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boostorg).