Скачать или смотреть How to Create a Stored Procedure That Accepts a List of Strings in SQL Server for ASP.NET Core 3.1

Learn how to create a stored procedure in SQL Server that efficiently accepts a list of strings as parameters, perfect for filtering data in your ASP.NET Core 3.1 application.
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How to Create a Stored Procedure That Accepts a List of Strings in SQL Server for ASP.NET Core 3.1

When developing web applications, it’s common to encounter scenarios where users want to filter data based on multiple criteria, such as brands, storage capacity, and price ranges. For instance, in your ASP.NET Core application, you may wish to allow users to filter items by various brands like Samsung, iPhone, and configurations such as storage capacity of 32GB, 64GB, and 128GB.

But how do you pass a list of strings to a stored procedure in SQL Server? Let's dive into an elegant solution that uses JSON to achieve this functionality seamlessly.

Problem Overview

In the proposed scenario, you have a controller that collects various filter criteria from user input, but you're unsure how to implement a stored procedure that handles lists of strings effectively. A straightforward method of passing parameters doesn't fit because users can select multiple brands or storage options at once.

Solution Approach

Using JSON for Multi-Value Parameters

By adopting JSON as a format to pass lists of strings (e.g., brands and storages) to the stored procedure, you can simplify the process and enhance flexibility. Here’s how you can accomplish this in a few steps:

Modifying the ASP.NET Core Controller: Adjust your GetItem method to incorporate JSON strings representing the filters.

Creating the SQL Server Stored Procedure: Define a stored procedure that accepts the JSON strings and utilizes SQL Server’s built-in JSON functions to parse and filter the results.

Step 1: Modify the ASP.NET Core Controller

In your existing controller, modify the parameters to accept JSON strings instead of individual strings. Here's a revised snippet of your controller:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Create the SQL Server Stored Procedure

Now, let’s build the stored procedure FilterByBrandStoragePrice. This stored procedure will accept the JSON parameters and filter the items accordingly:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Stored Procedure

Parameters: The stored procedure takes two JSON strings and two decimal values for the minimum and maximum price.

OPENJSON: SQL Server's OPENJSON function is used to convert the JSON input into usable data. This function simplifies the extraction of brands and storage values.

Filtering Logic: The query filters items based on their brand and storage capacity, as well as the defined price range.

Conclusion

Using this approach, you can effectively create a stored procedure that handles lists of strings via JSON parameters, allowing for more dynamic and versatile data retrieval in your ASP.NET Core application. This solution not only simplifies your SQL queries but also enhances the overall maintainability of your code.

By following these steps, you'll be equipped to implement robust filtering functionality in your web application, enabling your users to find exactly what they're looking for with ease.