Validating sql syntax

The function ns_txt_email can be used from SSMS, but it can also be used. For this project I decided to test by putting my tests in the script that Visual Studio provides as part of a Database project. Execute them by right clicking on the script and choosing "Debug Script".

My test script for the SQLCLR function is here: print case when 1=dbo.ns_txt_email('[email protected]') then 'Passes' else 'Fails' end ' test for good addr' print case when 0=dbo.ns_txt_email('@novicksoftware.com') then 'Passes' else 'Fails' end ' test for no user' print case when 0=dbo.ns_txt_email('[email protected]') then 'Passes' else 'Fails' end ' test for 1 char in tld' print case when 1=dbo.ns_txt_email('[email protected]') then 'Passes' else 'Fails' end ' test for 2 char in tld' print case when 0=dbo.ns_txt_email('[email protected]') then 'Passes' else 'Fails' end ' test for no domain' print case when 0=dbo.ns_txt_email('anov [email protected]') then 'Passes' else 'Fails' end ' test for space in name' print case when 0=dbo.ns_txt_email('ano#[email protected]') then 'Passes' else 'Fails' end ' test for # in user' print case when 0=dbo.ns_txt_email('[email protected]*software.com') then 'Passes' else 'Fails' end ' test for * asterisk in domain'Auto-attach to process '[5968] [SQL] nsl6' on machine 'nsl6' succeeded. The thread 'nsl6 [58]' (0x10d8) has exited with code 0 (0x0).

Regular expressions are expressions in a mini-language specific to searching text strings. There are also libraries of regular expressions that can be found. For validating e-mails I've chosen an expression from the MSDN .

They are perfectly suited to the task of validating e-mail addresses. Net documentation in an example that shows how to validate e-mail addresses.

I started with the existing project ns_txt and used the menu command Project/Add User-Defined Function.

I gave the function the name ns_txt_email and Visual Studio created a prototype function as shown here: Writing the code was pretty simple, given that there was an example in the Visual Studio documentation.

While these might be not be the most complete set of tests for an e-mail validation function, there the ones that I've been using for awhile. In SSMS, just select the text and execute the script.

It prints out a series of Passed/Failed messages about each test.

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The next task is to build and deploy the project and try the function.The thread 'nsl6 [58]' (0x10d8) has exited with code 0 (0x0).'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_32\mscorlib.0 'sqlservr.exe' (Managed): Loaded 'C:\Program Files\Microsoft SQL Server\M 'sqlservr.exe' (Managed): Loaded 'C:\WINDOWS\assembly\GAC_32\System.Later in the tip they'll be used to validate the new SQLCLR function.The SQLCLR alternative will use a regular expression to validate the e-mail address. There are many tutorials that you can find on-line if you want to learn more.

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