The Greatest Guide To dapper tutorial for beginners
The Greatest Guide To dapper tutorial for beginners
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This method accepts our query for a parameter plus a Func delegate that accepts two parameters of kind Enterprise conclusion Personnel. Inside the delegate, we try to extract a company by its Id benefit. If it doesn’t exist, we retail outlet it inside the currentCompany variable and add it into the dictionary. Also, we assign all the workers to that present company and return it from a Func delegate.
The product is a set of courses to connect with the database. Now let us include an entity course Customer while in the Model folder.
Entry the total implementation and find out how almost everything will work beneath the hood. Remember to star my GitHub repo if you discover it handy!
Working with the update and delete is rather straightforward simply because we already have the many necessary information. So, let’s leap straight on the code.
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QuerySingleOrDefault – executes a question and maps The end result or possibly a default benefit In case the sequence is empty. It throws an exception when there is more than one element during the sequence
Now it’s time to check our series of tutorials to cause you to find out Dapper and use it confidently in the .NET applications.
When Dapper is enabled it is possible to alter the Language fall down to C# Plan, map query final results to C# courses, and use the .Dump() method to inspect the effects:
As you could see, our query variable is made up of two Find dapper tutorial for beginners statements. The initial will return an individual corporation, and the next one particular will return all the workers of that enterprise. After that, we create a connection and then use that relationship to call the QueryMultipleAsync method.
If your target object has actually been specified (“Person” in the above sample), mapping is done by matching the names of returned columns with object Houses names.
Executes a query and maps The end result to an index of dynamic objects or, if specified, to an index of strongly typed objects:
Transactions are very uncomplicated to implement with Dapper. We are able to execute it utilizing the Dapper library (the one particular we currently use) or the Dappr.Transaction library, which is the same issue as Dapper, just Using the extended IDbConnection interface. In our example, we are going to utilize the Dapper library.
Today, each of the Houses from the business class hold the exact names as being the columns within the businesses table. But what would take place if Individuals don’t match?
If you would like find out more about why we use this DTO (and we're going to use A different just one to the Update action), you could examine our ASP.Internet Main World-wide-web API series of articles, the place we demonstrate the reason guiding this (articles 5 and 6 from the series).
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