Our new, slightly more complicated example will employ variables to designate name and location of the target file (where data exported from the. Let’s see how this concept can be applied to our sample package to eliminate some of its hard-coded values. Variables can be assigned either a literal value or an expression (SQL Server 2012 introduces the ability to view such expressions directly in the Variables window within the SQL Server Data Tools), but in both cases, they must possess a specific data type. You can minimize the possibility of such occurrences by introducing custom namespaces (other than the System and User), but only for User variables. In cases where variable names conflict, the ones with more localized scope take precedence. This means that while all of System and User variables on the package level are accessible from any of its components, the ones that have been created within a container, task, event handler, or precedence constraint, are not visible outside of it. User variables are limited to the scope of an SSIS container, which hosts their definition (the scope includes automatically all of its subcontainers). This is one of the primary distinctions that separate them from User variables, which can be created on an as needed basis and for which the majority of properties can be arbitrarily changed. The only modifiable property of System variables is their ability to raise an event when their value changes (which can be either enabled or disabled). System variables are predefined and, while their list cannot be customized, it has been expanded in SQL Server 2012 by including IgnoreConfigurationsOnLoad (of Boolean data type), ProductVersion and LastModifiedProductVersion (of String data type), as well as ServerExecutionID (of Int64 data type). In general, there are two types of variables – System and User (which occupy System and User namespaces, respectively). They also facilitate the use of properties that might change from one package execution to another as well as serve as loop counters, parameters of stored procedures, or components of more complex expressions. Their primary purpose is to provide runtime storage for values utilized by SSIS components, such as containers, tasks, event handlers, and precedence constraints, as well as the packages themselves. Our intention is to increase flexibility of this configuration by taking advantage of SSISvariables.ĭespite a number of significant functional changes, including several mechanisms that considerably simplify modifications of package and project settings both inside and outside of the development environment (which we will discuss in more detail in our upcoming articles), variables still remain a viable choice in a variety of scenarios (including improving package portability and simplifying their maintenance). table in the AdventureWorksDW database to a text file, where the path and name were hard-coded in the corresponding Flat File Connection Manager. As you might recall, its sole purpose was to copy content of. dtsx package), whose creation we described in our previous article. In addition, we will leverage our sample SSIS project (containing a single. ON (FILENAME = 'c:DataAdventureWorksDW2012_Data.mdf') ON (FILENAME = 'c:DataAdventureWorks2012_Data.mdf') In the resulting query window, type the following in order to attach the database files and recreate their logs (as the result, both database entries should appear under Databases folder in the Object Explorer window): CREATE DATABASE AdventureWorks Download them to an arbitrarily location on your SQL Server hosting Integration Services instance (we will use for this purpose C:Data folder), launch SQL Server Management Studio, connect to the target Database Engine, and select New->Query with Current Connection entry from the File menu. These product changes are also reflected by new versions of sample AdvantageWorks and AdvantageWorksDW databases, published on the CodePlex site. While RC0 was considered to be feature-complete, the RTM build should exclude any newly discovered bugs, making your initial testing somewhat less challenging. Now we can take advantage of the final version incorporated into the Released to Manufacturing (RTM) bits (currently in the evaluation format, with general availability expected on April 1, 2012). Our presentations have been based so far on the Release Candidate 0 (RC0) of the product, offered as a free download since mid-November 2011. In the recent articles published on this forum, we have been presenting new features of SQL Server 2012 Integration Services.
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