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![Package VariablesWithin SSIS, there are two types of variables: system variables and user variables.System variables System variables are not editable but can be referenced within tasks and containers. System variables are set by the package for tracking metadata such as the package name and the user that executes the package. User variables You can create and define user variables for any purpose in the package.User::[VariableName] System::[VariableName]](https://image.slidesharecdn.com/05controlflow-13028767539877-phpapp01/75/05-SSIS-Control-Flow-6-2048.jpg)
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05 SSIS Control Flow
The document discusses Microsoft SQL Server Integration Services (SSIS) and focuses on defining control flow and data flow objects. It describes the three primary types of control flow objects - tasks, containers, and constraints - and provides examples of common tasks and containers used in SSIS packages to manage workflow and data transformation. It also discusses using variables to store and pass information between different objects in the package control flow.
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05 SSIS Control Flow
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- 2. Defining Control andData Flow ObjectsThe control flow is the workflow engine that contains control flow tasks, containers, and precedence constraints, which manage when tasks and containers execute.The data flow, in contrast, is directly related to processingand transforming data from sources to destinations.
- 3. Defining Control FlowObjectsThere are three primary types of control flow objects:Control flow tasks Workflow objects that perform operational- level jobsControl flow containersProvide a grouping mechanism for tasks and other containersConstraints Let you connect tasks and containers and define execution ordering and precedence
- 4. Control Flow TasksAcontrol flow task is an SSIS component that performs a high level of operations such as sending an e-mail message, executing a SQL statement, or copying a file from an FTP server. When a control flow task is complete, it either succeeded or failed.
- 5. Control Flow ContainersThereare three primary containers in SSIS: a Sequence Container, a For Loop Container, and a Foreach Loop Container.Sequence Container Lets you organize subordinate tasks by grouping them together, and lets you apply transactions or assign logging to the container.For Loop Container Provides the same functionality as the Sequence Container except that it also lets you run the tasks within it multiple times based on an evaluation condition, such as looping from 1 to 10.Foreach Loop Container Also allows looping, but instead of providing a condition expression, you loop over a set of objects, such as files in a folder.
- 6. Package VariablesWithin SSIS,there are two types of variables: system variables and user variables.System variables System variables are not editable but can be referenced within tasks and containers. System variables are set by the package for tracking metadata such as the package name and the user that executes the package. User variables You can create and define user variables for any purpose in the package.User::[VariableName] System::[VariableName]
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- 9. Understanding Control FlowSTEP 1Complete Control FlowSTEP 2STEP 3
- 10. UnderstandingVariablesUser::Customer RecordsFull NameEmailSTEP 1User::Full NameUser::EmailCOMPLETESTEP 2User::Email CounterUser::EmailCounterEmail Counter > 2STEP 3COMPLETE
- 11. ResourcesControl Flow Elements-http://msdn.microsoft.com/en-us/library/ms137681.aspxDesigningPackage Control Flow- http://msdn.microsoft.com/en-us/library/ms140234.aspx
Editor's Notes
- #5 To create a new control flow task in your package, drag the task from the toolbox to theControl Flow tab in the SSIS Designer.After you add a task to the control flow workspace, you need to configure the task to performthe specific operation you selected. To allow configuration, every task has an editor thatyou can open by double-clicking the task or by right-clicking the task and then clicking Edit.Table 1-1 lists the tasks in SSIS under the Control Flow Items list in the toolbox.You might have noticed that there is also a list of Maintenance Plan Tasks for the controlflow. These are primarily for database administrators (DBAs) who are managing SQL Server2008 databases through the SSMS maintenance plan interface or DBAs who are creatingpackages in BIDS for database maintenance.As you can see, SSIS features the ability to perform a host of different processing andintegration operations.
- #7 Variables within SSIS are a way to integrate objects by passing values between tasks and containers, accepting values from external sources, or building code dynamically that is then executed. You can also use variables for auditing and logging.