Fascination About dapper tutorial for beginners

Fascination About dapper tutorial for beginners

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This process accepts our query as being a parameter along with a Func delegate that accepts two parameters of kind Business end Staff. Within the delegate, we make an effort to extract an organization by its Id value. If it doesn’t exist, we store it In the currentCompany variable and insert it for the dictionary. Also, we assign all the employees to that present-day corporation and return it from a Func delegate.

Here’s a summary Everything you can assume for being returned by Every single approach in case your question return no rows, a person row or numerous rows:

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Now, we're going to deal with a Article ask for in our API and make use of the ExecuteAsync system to create a new firm entity in the database.

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After we get various effects inside the multi variable, we can extract each final results (organization and workers for each that firm) by utilizing the ReadSignleOrDefaultAsync and ReadAsync procedures. The very first approach returns just one consequence, while the next returns a group.

Below, we make a variable that contains a course of action name and also a dynamic parameter object with an individual parameter inside of. Simply because our stored technique returns a value, we make use of the QueryFirstOrDefaultAsync system to execute it.

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Naturally, In case you have requested Dapper to return a specific type, like the Person while in the sample code proven prior to, you should have the dapper tutorial for beginners asked for object returned in lieu of “Row”.

Should the focus on object is specified (“User” in the above mentioned sample), mapping is completed by matching the names of returned columns with object properties names.

Now, we have to outline the link string of our databases, so that the application can connect with our Databases for undertaking CRUD functions. Open up the appsettings.json file during the Dapper.WebApi Job and insert the subsequent

This is quite concise and clean up, nonetheless it doesn’t let to specify if a parameter is surely an enter or output parameter, and the information style is inferred with the parameter sort alone. Listed here’s what get executed on the databases:

If you wish to simulate an error and check that no rows will be developed while in the database, you'll be able to throw an exception beneath the await code line. You'll find no new rows in the Companies desk.

Listed here, we develop our question plus a dynamic parameters object (we're not employing an anonymous object any more). We populate that object with our a few parameters and afterwards get in touch with the ExecuteAsync method to execute our insert assertion.

Simplicity: Dapper offers a straightforward and intuitive API for executing queries and mapping effects. It lets you compose SQL queries straight, supplying you with entire Handle over your databases interactions.