How Can I Create a SQL Login Dynamically within a Stored Procedure?

CREATE LOGIN with Dynamic Parameters

When attempting to create a SQL Login within a Stored Procedure using dynamic parameters, developers may encounter the error "Incorrect syntax near '@username'." This cryptic message can be misleading, leading to confusion.

The underlying issue is that the CREATE LOGIN statement only accepts literal usernames, not parameters. To circumvent this limitation, one must employ a workaround:

1. Construct a Dynamic SQL Command: Build a SQL command string that contains the CREATE LOGIN statement with the desired username and password.
2. Execute the Dynamic SQL: Utilize the EXEC command to execute the dynamically constructed SQL string, dynamically creating the SQL Login.

Here's an example of how this workaround can be implemented:

DECLARE @sql nvarchar(max) = 'CREATE LOGIN ' + quotename(@username) + ' WITH PASSWORD = ' + quotename(@password, '''');
EXEC(@sql)

This code first constructs the dynamic SQL command string, ensuring that the username and password are quoted for safety against SQL injection attacks. It then executes the dynamic SQL command using the EXEC statement, creating the SQL Login.

By adopting this approach, developers can overcome the limitation of CREATE LOGIN only accepting literals and dynamically create SQL Logins within their Stored Procedures.

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