Most of the time, you must want utilizing the above mentioned techniques instead of utilizing the one with the same names about the IEnumerable. This is because of how Dapper functions driving the scenes: by default all the result set is study in memory along with the returned being an IEnumerable. The theory driving this habits is to keep the relationship towards the database open up to the the very least length of time probable, in order to favor concurrency in the database amount. For those who don’t such as this behavior, Understand that it might be altered and we’ll focus on about that in future.
Using the QueryMultipleAsync() approach, we can easily execute numerous SQL statements and return numerous results in only one question. Permit’s see how to do that with an case in point.
QueryMultiple – an extension process that executes several queries inside the same command and maps benefits
It is crucial to realize that Dapper is SQL Injection Protected simply because we can easily use parameterized queries, which we should always usually do. Yet one more critical factor is usually that Dapper supports many database suppliers. It extends ADO.NET’s IDbConnection and delivers helpful extension strategies to query our databases. Obviously, We have now to write down queries appropriate with our databases supplier.
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Now, if we phone this technique and go a company for creation to it, it'll produce a new entity for us. But, even though developing API’s Write-up motion, it is a good practice to return a hyperlink, which the API’s consumers can use to navigate for the designed entity.
As you may see, when we cease using our relationship, we must eliminate it. After we produce a relationship, we will use it to simply call the QueryAsync strategy and pass the question being an argument. For the reason that QueryAsync() technique returns IEnumerable, we transform it to a list once we want to return a consequence.
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In this post, we’ll learn how to employ Dapper from the ASP.NET Main World wide web API undertaking. We’ll discuss Dapper In general, tips on how to use distinct queries and executions, how to execute saved methods, and the way to develop multiple queries within a transaction.
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Executes a query and maps the result to a summary of dynamic objects or, if specified, to a summary of strongly typed objects:
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This methods executes a question that return a resultset crafted from exactly 1 row and a single column. Just like the great previous IDBCommand.ExecuteScalar.
If you want to find out more about why we use this DTO (and we're going to use dapper tutorial for beginners Yet another one to the Update action), you may browse our ASP.NET Core World wide web API number of articles, exactly where we demonstrate The main reason at the rear of this (articles or blog posts 5 and six in the collection).
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