How Can I Create SQL Logins with Dynamically Passed Usernames?

Creating Logins with Dynamic Parameters: Overcoming the "@parameter as username" Obstacle

In the pursuit of creating custom Stored Procedures to manage tenant settings, Justin encountered a perplexing hurdle: the inability to utilize parameterized usernames in the CREATE LOGIN statement. Despite the seemingly straightforward nature of this task, the cryptic SQL error messages proved disconcerting.

The issue stems from the fact that CREATE LOGIN expects literal usernames as opposed to parameterized values. To circumvent this limitation, Justin can employ the dynamic SQL technique.

Dynamic SQL Approach

Justin can construct the CREATE LOGIN statement dynamically using the DECLARE and EXEC statements, as follows:

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

In this code:

• The DECLARE statement assigns the CREATE LOGIN statement to the variable @sql. Quoting the username and password values using the quotename function helps protect against SQL injection attacks.
• The EXEC statement executes the dynamic SQL stored in @sql.

By wrapping the CREATE LOGIN statement within EXEC, Justin can effectively pass parameterized values into the statement at runtime, resolving the "Incorrect syntax near '@username'" error.

Conclusion

Utilizing dynamic SQL provides a solution when working with SQL statements that require literal values instead of parameters. By embracing this technique, Justin can confidently create Tenant logins within his Stored Procedure, empowering him to automate the tenant management process and streamline his SaaS database administration.

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