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Choosing between T-SQL vs. CLR

From: SQL Server: Triggers, Stored Procedures, and Functions

Video: Choosing between T-SQL vs. CLR

Now that we've seen how to create a stored procedures using T-SQL and how to create stored procedures using C#, you're going to be faced with a decision. Every stored procedure you create, you have to choose either T-SQL or C#. I'd like to give you some tips on which one to use. There's very little that can be done and one that can't be done in the other. If you try hard enough, you can accomplish anything with either one. But each one does have its stress and its weaknesses. T-SQL's strength is certainly querying data.

Choosing between T-SQL vs. CLR

Now that we've seen how to create a stored procedures using T-SQL and how to create stored procedures using C#, you're going to be faced with a decision. Every stored procedure you create, you have to choose either T-SQL or C#. I'd like to give you some tips on which one to use. There's very little that can be done and one that can't be done in the other. If you try hard enough, you can accomplish anything with either one. But each one does have its stress and its weaknesses. T-SQL's strength is certainly querying data.

We can just go in there and directly write a SELECT, UPDATE, INSERT or DELETE statement. You don't have to set up a connection, don't have to close a connection. We just write our T-SQL statements and they run. T-SQL however, is poor with complex logic. We have very few decision structures. Basically, you've an if, and not a whole lot of else, and we have a very few looping structures. You have a while, and not a whole lot else. T-SQL does not natively support, arrays, collections, for-each or classes, and all of those are things that the typical programmer wants.

The .NET languages, their weakness is querying data and it's not super difficult to query data, but you're going to have to write approximately 3 to 5 lines of code to set up a connection, and then every time you want to use that connection, you should manually open the connection, and manually close the connection. So it's placing some administrative overhead on the developer. The .NET however, is very robust with looping and control of flow. We've lots of great looping structures, lots of great decision structures in all of the .NET languages.

And the .NET languages can be compiled for multiprocessor environments and will run much faster and much more efficiently in a multiprocessor environment. So when making this choice, Microsoft has clearly stated repeatedly that you should use T-SQL for any stored procedure where the primary focus is data access. However, if you have complex logic or a CPU intensive function, they recommend the .NET framework. I certainly agree with both of those recommendations.

I'll go ahead and add a third one, but you also have to think about human resources, the people that are writing the program, if they are much stronger in T-SQL, or much stronger in C#, obviously, that's going to influence your decision. But if your team of developers has approximately the same level of experience with both, then certainly these are valid ways to make the choice. T-SQL for data access and .NET for complex logic.

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This video is part of

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  1. 2m 15s
    1. Welcome
      51s
    2. What you should know
      51s
    3. Using the exercise files
      33s
  2. 11m 1s
    1. Comparing triggers, functions, and procedures
      3m 25s
    2. Why use a stored procedure?
      4m 59s
    3. Why use functions?
      1m 27s
    4. Why use triggers?
      1m 10s
  3. 6m 2s
    1. Configuring your environment
      4m 53s
    2. Downloading and installing a sample database
      1m 9s
  4. 26m 25s
    1. Creating a stored procedure
      2m 46s
    2. Modifying a stored procedure
      2m 34s
    3. Returning data using data sets
      3m 45s
    4. Returning data using cursors
      3m 45s
    5. Using input and output parameters
      5m 24s
    6. Using security and permissions
      5m 24s
    7. Using transactions
      2m 47s
  5. 11m 56s
    1. Creating a user-defined function
      4m 59s
    2. Exploring single-value functions
      4m 18s
    3. Exploring table value functions
      2m 39s
  6. 9m 31s
    1. Using "after" triggers
      3m 47s
    2. Using "instead of" triggers
      2m 9s
    3. Using nested triggers
      1m 38s
    4. Using database-level triggers
      1m 57s
  7. 12m 43s
    1. Exploring a real-world INSERT procedure
      5m 32s
    2. Exploring a real-world UPDATE procedure
      3m 13s
    3. Implementing logging on DELETE
      3m 58s
  8. 19m 38s
    1. Understanding the Common Language Runtime (CLR) and the .NET framework
      1m 52s
    2. Using CLR with SQL Server 2012
      4m 11s
    3. Writing stored procedures with C# .NET
      5m 51s
    4. Writing functions with .NET
      5m 7s
    5. Choosing between T-SQL vs. CLR
      2m 37s
  9. 11m 34s
    1. Creating a basic web form and connecting to a database
      2m 56s
    2. Executing a stored procedure
      2m 4s
    3. Passing parameters
      3m 41s
    4. Getting return values
      2m 53s
  10. 1m 43s
    1. Next steps
      1m 43s

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