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For example, the following snippet creates a new task in the Work calendar with the summary (name) Mow the Roses and a due date in July 2010:

Expressions add dynamic functionality to SSIS packages using a simple syntax based on a subset of the C language. Expression syntax does not include any control of flow (looping, branching, and so on) or data modification capabilities. Each expression evaluates to a single scalar value, and although this can often seem restrictive to developers who are new to SSIS, it allows expressions to be used in a variety of places within a package. How can we use expressions in a package The simplest way is to use property expressions. All containers in SSIS, including tasks and the package itself, have an Expressions property, which is a collection of expressions and the properties to which their values will be assigned. This allows SSIS package developers to specify their own code the expression that is evaluated whenever a property of a built-in or thirdparty component is accessed. How many other development tools let you do that Let s look at an example. Figure 1 shows the properties for an Execute SQL Task configured to execute a DELETE statement. Although this Execute SQL Task is functional, it isn t particularly useful unless the package always needs to delete the order details for [OrderID]=5. This task would be much more useful if it instead deleted whatever order number was current for the package execution. To implement this dynamic behavior, we re going to take two steps. First, we re going to add a new variable, named OrderID, to the package. (If you don t

know how to do this already, consider it an exercise we won t walk through adding a variable step by step.) Second, we re going to add a property expression to the SqlStatementSource property of the Execute SQL Task. To do this, we ll follow the steps illustrated in figure 2.

tell the application "iCal" make new todo at the end of todos of the calendar "Work" with properties {summary:"Mow the Roses", due date:date "Wednesday, July 14, 2010 12:00:00 PM"} end tell

Before you leave this chapter, I d like to introduce you to my next guest, Dr Van Tharp, a trading coach and author who developed a number of indicators that help traders use psychology to understand the stock market As you ll find out, he says your success as a trader depends on how well you know yourself

In the Properties window, select Execute SQL Task and then click on the ellipsis (...) button next to the Expressions property. This will cause the Property Expressions Editor dialog box to be displayed. In the Property Expressions Editor dialog box, select the SqlStatementSource property from the drop-down list in the Property column. Click on the ellipsis button in the Expression column. This will cause the Expression Builder dialog box to be displayed. (Please note that figure 2 shows only a subset of the Expression Builder dialog box to better fit on the printed page.) Enter the following expression in the Expression text box:

The ideal way to work with a task via AppleScript is to identify it by its uid property because this property s uniqueness means you can be sure you ve got exactly the item you want But unless you ve just created the task, you re not likely to be able to grab its uid property quickly unless you can easily identify it in another way for example, by virtue of its being the first item in a particular calendar The following example shows a way of using the summary property of a todo object to identify it and then delete it, though you could use the same technique to perform other operations on it for example, shoving its due date out into the middle distance or ratcheting up its priority to the subpoena level Here s what the code does:

"DELETE FROM [dbo].[Order Details] WHERE [OrderID] = " + (DT_WSTR, 50) @[User::OrderID]