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Microsoft SQL Server 2012 Integration Services: An Expert Cookbook

You're reading from   Microsoft SQL Server 2012 Integration Services: An Expert Cookbook Over 80 expert recipes to design, create, and deploy SSIS packages with this book and ebook

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Product type Paperback
Published in May 2012
Publisher Packt
ISBN-13 9781849685245
Length 564 pages
Edition 1st Edition
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Table of Contents (23) Chapters Close

Microsoft SQL Server 2012 Integration Services: An Expert Cookbook
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started with SQL Server Integration Services 2. Control Flow Tasks FREE CHAPTER 3. Data Flow Task Part 1—Extract and Load 4. Data Flow Task Part 2—Transformations 5. Data Flow Task Part 3—Advanced Transformation 6. Variables, Expressions, and Dynamism in SSIS 7. Containers and Precedence Constraints 8. Scripting 9. Deployment 10. Debugging, Troubleshooting, and Migrating Packages to 2012 11. Event Handling and Logging 12. Execution 13. Restartability and Robustness 14. Programming SSIS 15. Performance Boost in SSIS Index

For Loop Container: looping through static enumerator till a condition is met


The For Loop Container is a method to create looping in the SSIS package Control Flow and is very similar to the For Loop structure that exists in programming languages. In this looping container, SSIS optionally initializes an expression and repeats its workflow until the expression evaluates to false.

As mentioned previously, this container repeats something until a condition in the EvalExpression property evaluates to true. Some examples could be as follows:

  • Doing something n times

  • Wait for some time (seconds, minutes, hours...) in each interaction until a specific action takes place; for example until a flag stored in a database changes

  • Wait until a specific date and time to do something

To configure this container three important properties must be considered:

  • InitExpression : An optional initialization expression for the loop counter.

  • EvalExpression: This evaluates an expression and must be true, otherwise the...

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