Jim Craddock

Data Driven Architecture

by Jim Craddock

SQLServerCentral.com

Miscellaneous

Most SQL Server developers and DBAs are familiar with the concept of using a database as a back end to a web site or other application. However the database can be used to store more than just the data that users will edit. An interesting approach to application design begins with some knowledge of the metadata about the underlying data structures and using this to drive the application's behavior. New author Jim Craddock has utilized just such a concept in one if his applications and he brings us a look at how this works.

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2005-02-17

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return:

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

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Jim Craddock

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Question of the Day

Adding new column with DEFAULT II