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Notice that some constraint lines are solid, some are dashed, and some have function symbols (Fx) associated with them. Each of these indicates the implementation of a different precedence constraint feature, as follows:

XmlValidatingReader scans the XML for any schema, detecting both inline schema and referenced schema. Referenced schema are loaded, or they can be preloaded by add ing them to the Schemas property.

Solid lines represent logical AND precedence, meaning that a task will run only when all the constraint conditions are met. Dashed lines are logical OR statements between tasks. For example, if a task has dashed constraints pointing to it, the task will run when either of the precedence conditions is met. Function symbols show that an SSIS expression has been embedded in the constraint for evaluation. When you use embedded expressions, constraints can determine task execution unrelated to preceding task results.

Each Flickr photo comes prescaled to various sizes, accessible via slightly different filenames. You ll note that script-level constants are used to describe the sizes of these images.

9

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Within the control flow, you can edit a precedence constraint by double-clicking the constraint or by right-clicking the constraint and then clicking Edit. Figure 2-11 shows the Precedence Constraint Editor. As you look at the Precedence Constraint Editor dialog box in Figure 2-11, notice the two general groupings of properties: the Evaluation Operation properties and the Multiple Constraints properties.

The type of schema validation is determined by the ValidationType property. The pos sible values for the ValidationType property are shown in Table 9-5

A square thumbnail is 75 x 75 pixels. A regular thumbnail is 100 pixels on its longest side. A small image is 240 pixels on its longest side. A medium image is 500 pixels on its longest side. A large image is 1024 pixels on its longest side. The original image has no size restrictions.

The Evaluation Operation properties let you define the conditions that determine the successful evaluation of the constraint. There are two primary evaluation indicators:

Constraints are simply the execution status of the upstream (preceding) task (completion, failure, or success), which you can select from the Value drop-down list. For example, if an upstream task fails and the constraint is set to Failure, the constraint requirement is met. Expressions in the precedence constraints are advanced Boolean evaluators (meaning that they must evaluate to True or False) that you can write in the SSIS Expression language. Expressions can include mathematical and string functions and can reference package variables. When the evaluation operation allows an expression, you can type it in the Expression box.

Table 9-5

Inside the class proper we find a host of public-init properties that store the details supplied via the XML response. The farm, secret, and server variables are all used to construct the web address of a given image. The other variables should be self-explanatory. At the foot of the class we have the web addresses of each scaled image. The different sizes of image all share the same basic address, with a minor addition to the filename for each size (except for medium). We can use these addresses to load our thumbnails and full-size images. In our project we ll be working with the thumbnail and medium-size images only. The class can load any of the images, but since extra

You can specify different combinations of these two evaluation indicators that work together to determine whether the precedence constraint allows a downstream (subsequent) task to execute. The Evaluation Operation drop-down list includes four options:

Description No validation type. Setting the property to this value creates a nonvalidating reader. Examines the contents of the document and determines the most appropriate validation type. Validates according to the indicated document type definition (DTD). Validates according to inline or referenced extensible schema defi nition (XSD) schema. Validates according to inline or referenced XML-Data Reduced (XDR) schema.

constraint By selecting Constraint, you specify that only the execution completion status will be used to evaluate the precedence constraint. expression By selecting Expression, you specify that only an expression will be used to evaluate the precedence constraint. expression and constraint If you select Expression And Constraint, the precedence constraint will evaluate to True only if both expressions evaluate to True and the execution status matches the constraint setting. expression Or constraint

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