Can a NULL value be passed into a SQL Server Stored Procedure from Typescript?

I'm currently facing a dilemma where I need to assign a Null value to a uniqueidentifier variable in a stored procedure. The issue arises when attempting to pass an empty string to the variable, resulting in the error message "Cannot convert varchar to uniqueidentifier". While executing the procedure in SQL Server everything functions properly, but TypeScript triggers the aforementioned error...

Below is the executed procedure code:

USE [CMS_ONE]
GO

DECLARE @return_value int

EXEC    @return_value = [dbo].[PrAdmissionReports]
        @session = '82c16d40-56ba-4e5a-b6f4-8f3767fc48fa',
        @campus = '0EF13205-3150-43F3-A37A-CDE57BFD544E',
        @program = '929A0FCD-81C8-44D3-AC56-020E7C0AA2B2',
        @fromDate = '2018-07-02',
        @toDate = '2018-07-27'

SELECT  'Return Value' = @return_value

GO

I've been trying to pass @program as ProgramDetailID = null to the procedure, however, the error persists.

This is how I'm passing the values from the front-end:

this.sessionID +
  "," +
  this.campusID +
  "," +
  this.programDetailID +
  "," +
  this.fromDate +
  "," +
  this.toDate

Any assistance on this matter would be greatly appreciated

Answer №1

To keep things organized, I am assuming that you are utilizing a backend system powered by JavaScript rather than directly accessing your database from the frontend to avoid security risks.

Instead of concatenating an empty string as shown, consider using one of the following methods:

this.someField ? this.someField : 'NULL'

or

this.someField ?? 'NULL'

A more effective and secure approach would be to parameterize your queries.

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