Defensive Database Programming - Red Gate Software

Chapter 1: Basic Defensive Database Programming Techniques@DateFrom = '20090101';SET LANGUAGE 'Norsk' ;EXEC dbo.SelectObjectsChangeLogForDateRange@DateFrom = '20090101';-- your actual error message may be different from mine,-- depending on the version of SQL ServerChanged language setting to us_english.(successful output skipped)Changed language setting to Norsk.ObjectID ChangedColumnName ChangedAt OldValue----------- -------------------- ------------- --------------Msg 242, Level 16, State 3, Procedure SelectObjectsChangeLogForDateRange, Line 6The conversion of a char data type to a datetime data typeresulted in an out-of-range datetime value.Listing 1-16: Our stored procedure breaks under Norwegian language settings.Under the Norwegian language settings we receive an error at the point where itattempts to convert 12/31/2099 into a DATETIME string.Note that we are, in fact, quite fortunate to receive an error message right away. Shouldwe, in some other script or procedure, convert '10/12/2008' to DATETIME, SQL Serverwould silently convert this constant to a wrong value and we'd get incorrect results.Listing 1-17 shows how our stored procedure can return unexpected results withoutraising errors; such silent bugs may be very different to troubleshoot.INSERT INTO dbo.ObjectsChangeLog( ObjectID ,ChangedColumnName ,ChangedAt ,40