This PR is for issue #106

Codecov Report

Merging #116 into master will decrease coverage by 0.07%.
The diff coverage is 62.5%.

@@             Coverage Diff              @@
##             master     #116      +/-   ##
============================================
- Coverage     78.94%   78.87%   -0.08%     
  Complexity     1011     1011              
============================================
  Files           258      258              
  Lines          3662     3673      +11     
  Branches        487      490       +3     
============================================
+ Hits           2891     2897       +6     
- Misses          531      535       +4     
- Partials        240      241       +1

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@mp911de - can you please take a look and let me know if this is how it is supposed to be implemented?

Sure. You're heading in a good direction. We added a bit of documentation to R2DBC SPI about exceptions: https://github.com/r2dbc/r2dbc-spi/blob/master/r2dbc-spec/src/main/asciidoc/exceptions.adoc

You might also have a look at what I did for SQL Server: r2dbc/r2dbc-mssql@8c89765

It's basically reflecting various errors with most appropriate exception types to indicate what's going wrong.