In most cases, you'll want to choose applying the above mentioned strategies in lieu of utilizing the 1 Along with the same names on the IEnumerable. This is due to how Dapper performs guiding the scenes: by default the entire outcome set is study in memory along with the returned being an IEnumerable. The concept driving this habits is to help keep the link for the database open for the the very least amount of time achievable, in an effort to favor concurrency with the database degree. In case you don’t such as this conduct, Take into account that it could be modified and we’ll go over about that in potential.
Using the QueryMultipleAsync() strategy, we can easily execute several SQL statements and return several leads to a single question. Permit’s see how to do that with an case in point.
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Processes incoming requests, manipulates info utilizing the design, and renders the final output with the see.
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QuerySingleOrDefault – executes a question and maps the result or a default price In the event the sequence is empty. It throws an exception if there is multiple ingredient from the sequence
Commonly, we produce a See With all the very same identify being an Action system, so let us generate an Index view and increase the following code.
When Dapper is enabled you are able to alter the Language drop down to C# Application, map query results to C# lessons, and utilize the .Dump() approach to examine the final results:
As you can see, our question variable contains two Choose statements. The initial will return one enterprise, and the 2nd a person will return all the workers of that corporation. Following that, we develop a connection after which use that connection to call the QueryMultipleAsync technique.
If the target item has actually been specified (“User” in the above mentioned sample), mapping is done by matching the names of returned columns with object Qualities names.
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If you would like simulate an mistake and check that no rows is going to be made from the databases, you may throw an exception beneath the await code line. You will discover no new rows in the Companies desk.
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