Test-driven database hotfix development (TDHD) with SQL unit test based framework (tSQLt)

Test-driven database hotfix development (TDHD) with SQL unit test based framework (tSQLt)

This article talks about test-driven database hotfix development using a very productive database testing framework called tSQLt applying the same SQL unit test based approach.

This article talks about test-driven database hotfix development using a very productive database testing framework called tSQLt applying the same SQL unit test based approach.

In this article, we will focus on a test-first approach to build simple SQL database hotfixes provided they are T-SQL compliant and have no other dependencies.

This article also highlights the importance of creating SQL unit test using tSQLt for the purpose of hotfix testing.

About test-driven database hotfix development

It is easier (if not essential) to understand test-driven database hotfix development if you are already familiar with test-driven database development concepts or have read and implemented the examples presented in the following articles:

  1. Fundamentals of test-driven database development
  2. The concept of test-driven data warehouse development

Let us now take a look at the potential definitions of test-driven database hotfix development inspired by test-driven database development:

Definition 1

It is a test first approach to build and test simple SQL database hotfixes before they get deployed to run in Production environments.

Definition 2

It is a method of developing a simple database hotfix by testing it first.

Definition 3

It is a simple SQL hotfix development strategy where testing the hotfix helps in building it successfully.

Test-driven database development vs test-driven database hotfix development

At first glance, if you are not familiar with test-driven database development it apparently makes no sense that how a test can help us to build something.

However, the truth is that the SQL unit test is shaping your logic to build that object in the test-driven database paradigm (model) thereby encouraging you to keep on modifying your object until the test which satisfies the requirements starts giving you the green signal.

The only difference in the case of test-driven database hotfix development is that the database object in this particular case is a script or even a procedure that is solely responsible to fix a database related performance, consistency or business (requirements) issue.

Test-driven database development vs test-driven database hotfix development

Test-driven database hotfix development implementation

Let us now implement this approach based on a real-time scenario where you have been instructed by the business to apply a database hotfix.

However, before you make a start you must have a database which is an essential element in understanding the whole scenario.

sql unit testing database

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