The Greatest Guide To dapper tutorial for beginners
The Greatest Guide To dapper tutorial for beginners
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Just before utilizing Dapper within our job, we must get ready a database and create a new World wide web API challenge. So, Enable’s begin with the databases.
Utilizing the QueryMultipleAsync() system, we can certainly execute a number of SQL statements and return a number of leads to just one query. Let’s see how to do that using an instance.
The above code is quite simple to know, below We have now added a database connection string to some variable identified as myCS. Up coming We now have assigned a variable sql a databases insert question.
Procedures incoming requests, manipulates info using the product, and renders the final output for your view.
We’ll use test-catch blocks in Every motion within our controller for the example’s sake. But to stay away from code repetition, we strongly propose reading through our International Mistake Handling posting.
When we get various benefits inside the multi variable, we will extract both effects (business and workforce per that corporation) by using the ReadSignleOrDefaultAsync and ReadAsync strategies. The first approach returns only one outcome, when the 2nd returns a collection.
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by default. If you prefer have Manage on how strings are passed on the databases, you have to use the DBString class:
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Executes a query and maps the result to a summary of dynamic objects or, if specified, to an index of strongly typed objects:
This is extremely concise and cleanse, however it doesn’t permit to specify if a parameter is surely an input or output parameter, and the info type is inferred within the parameter kind alone. Right here’s what get executed over the database:
In order to simulate an error and check that no rows will likely be developed inside the database, you are able to throw an exception down below the await code line. You will find no new rows in the businesses desk.
If you need to learn more about why we use this DTO (and we're going to use A different a single for the Update motion), you'll be able to study our ASP.Web Core Website API series of posts, where by we make clear the reason guiding this (content articles five and 6 with the series).
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