dapper tutorial for beginners - An Overview

dapper tutorial for beginners - An Overview

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This method accepts our question like a parameter along with a Func delegate that accepts two parameters of kind Business stop Employee. Inside the delegate, we endeavor to extract a corporation by its Id benefit. If it doesn’t exist, we retailer it inside the currentCompany variable and increase it into the dictionary. Also, we assign all the workers to that present organization and return it from the Func delegate.

We inject the IConfiguration interface to empower usage of the connection string from our appsettings.json file. Also, we produce the CreateConnection strategy, which returns a completely new SQLConnection object. For this to work, we need to incorporate various applying statements:

QueryMultiple – an extension approach that executes many queries throughout the exact same command and maps effects

Dapper.Internet however features substantial positive aspects, particularly in phrases of general performance and Manage. Will investigate Dappet.Internet in forthcoming content earning a simple CRUD application and looking out at advantages and disadvantages of it.

Execute – an extension technique that we use to execute a command a single or a number of situations and return the number of affected rows

At the time we get several results Within the multi variable, we can extract both equally final results (enterprise and personnel for every that organization) by utilizing the ReadSignleOrDefaultAsync and ReadAsync techniques. The main strategy returns only one outcome, even though the 2nd returns a set.

As you are able to see, as soon as we prevent employing our link, we must dispose of it. When we produce a link, we could utilize it to connect with the QueryAsync technique and pass the question as an argument. Since the QueryAsync() technique returns IEnumerable, we transform it to a listing when we wish to return a final result.

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With this selection all is needed is usually that anonymous item’s fields have the similar name on the used parameters. You should utilize the “@” sign also in the sector identify If you'd like or you could omit it provided that, all over again, the name matches the parameter you wish to assign the worth to.

QuerySingle – an extension method that executes a question and maps The end result. It throws an exception if there is not specifically a single component within the sequence

No matter whether you ought to learn Net improvement or software architecture you'll want to check our Classes and pick the one which you want.

It is one of the speediest and simplest all over, however it is vitally extensible and, previously mentioned all, well adopted and Utilized in pretty large-performance Sites. More exclusively has been designed and is particularly taken care of by the blokes at the rear of StackOverflow, so that you can be certain it is actually battle-tested. Supply dapper tutorial for beginners code is on GitHub

Right now, many of the Houses from the business course provide the identical names as the columns within the Companies desk. But what would occur if Those people don’t match?

1 good feature you have when applying nameless objects as parameters is the chance to pass an IEnumerable. This is helpful in the event you ought to pass an index of values for use within a IN assemble: can just move an IEnumerable as parameter benefit, and also the values will probably be automatically expanded to the comma-separated listing of values.

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