Calling a SQL User-defined function in a LINQ query

Calling a SQL User-defined function in a LINQ query

To call a SQL user-defined function in a LINQ query, you can use the SqlFunctions class provided by the Entity Framework. Here's an example:

Suppose you have a SQL user-defined function called CalculateDiscount, which takes a price as input and returns the discounted price. You can call this function in a LINQ query like this:

using System.Data.Entity.SqlServer;

var discountedProducts = from p in db.Products
                         where SqlFunctions.CalculateDiscount(p.Price) > 50
                         select p;

Here, db.Products is an instance of your DbContext class, and p.Price is the price of each product. The SqlFunctions.CalculateDiscount() method takes the price as input and returns the discounted price, which is then compared to 50 in the where clause.

Note that you need to include the System.Data.Entity.SqlServer namespace in your code to use the SqlFunctions class.

Examples

  1. "LINQ query with SQL User-defined function example"

    var result = dbContext.YourTable
    .Where(e => YourUserDefinedFunction(e.Column) == someValue)
    .ToList();

    Description: Demonstrates a basic LINQ query calling a SQL User-defined function (YourUserDefinedFunction) in the WHERE clause.

  2. "LINQ to Entities calling SQL Server function"

    var result = dbContext.YourTable
    .Select(e => new
    {
        e.Column,
        Result = dbContext.YourFunction(e.Column)
    })
    .ToList();

    Description: Illustrates how to use LINQ to Entities to call a SQL Server function (YourFunction) and include its result in the LINQ projection.

  3. "LINQ query with scalar-valued SQL function"

    var result = dbContext.YourTable
    .Select(e => YourScalarFunction(e.Column))
    .ToList();

    Description: Shows how to use a LINQ query to call a scalar-valued SQL function (YourScalarFunction) directly in the SELECT clause.

  4. "LINQ to SQL call table-valued function"

    var result = dbContext.YourTableValuedFunction(parameter)
    .ToList();

    Description: Demonstrates how to call a table-valued SQL function (YourTableValuedFunction) in LINQ to SQL.

  5. "LINQ query with SQL Server function and parameters"

    var result = dbContext.YourTable
    .Where(e => dbContext.YourFunctionWithParameters(e.Column, param1, param2) == someValue)
    .ToList();

    Description: Illustrates using a LINQ query with a SQL Server function that accepts parameters (YourFunctionWithParameters) in the WHERE clause.

  6. "LINQ to SQL call SQL Server stored procedure"

    var result = dbContext.YourStoredProcedure(param1, param2)
    .ToList();

    Description: Shows how to use LINQ to SQL to call a SQL Server stored procedure (YourStoredProcedure) with parameters.

  7. "LINQ query using context.Database.SqlQuery for function"

    var result = dbContext.Database
    .SqlQuery<YourEntityType>("SELECT * FROM YourTable WHERE YourFunction(Column) = @param", param)
    .ToList();

    Description: Demonstrates using context.Database.SqlQuery to execute a SQL query with a function (YourFunction) in LINQ.

  8. "LINQ to Entities call custom database function"

    var result = dbContext.YourTable
    .Where(e => dbContext.Database.YourFunction(e.Column) == someValue)
    .ToList();

    Description: Illustrates how to use LINQ to Entities to call a custom database function (YourFunction) from the Database property of the context.

  9. "LINQ query with SQL Server inline table-valued function"

    var result = dbContext.YourInlineTableValuedFunction(parameter)
    .ToList();

    Description: Demonstrates how to call an inline table-valued SQL Server function (YourInlineTableValuedFunction) in a LINQ query.

  10. "LINQ query with multiple SQL functions"

    var result = dbContext.YourTable
    .Select(e => new
    {
        Column1 = dbContext.YourFunction1(e.Column),
        Column2 = dbContext.YourFunction2(e.Column)
    })
    .ToList();

    Description: Shows how to use a LINQ query with multiple SQL functions (YourFunction1 and YourFunction2) in the SELECT clause.

More Tags

android-configchanges alter-column azure-data-factory grails-orm window.open mule-component jasmine2.0 arcmap aggregate reportbuilder

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