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We ll continue by looking at expressions in the SSIS control flow. Although the example in the previous section is technically a control flow example (because we applied a property expression to a property of a task, and tasks are control flow components) there are more interesting examples and techniques we can explore. One of the most important and overlooked techniques is using expressions with precedence constraints to conditionally execute tasks. Consider the following requirements: If a specific table exists in the target database, execute a data flow task. If the table does not exist, execute an Execute SQL Task to create the table, and then execute the data flow task. If this problem needed to be solved using a traditional programming language, the developer would add an if statement and that would be that. But SSIS does not include an if statement, a branching task, or the like, so the solution, although simple, is not always obvious. An often-attempted approach to solve this problem is to add a property expression to the Disabled property of the Execute SQL Task. The rationale here is that if the Execute SQL Task is disabled then it won t execute, and only the data flow task will run. The main problem with this approach is that the Disabled property is designed to be used

He also created an indicator that looks at the daily percent changes in the S&P 500 Index over the last 100 days using a proprietary technical indicator he calls the System Quality Number (SQN) (Note: A chart of SQN is located in 12) I developed the SQN to measure how well trading systems perform, but I discovered I could also use it effectively to monitor what the market is doing, Tharp explains For the last 60 years, he says, the market SQNs have ranged from +5, which is extremely bullish, to 2 The negative numbers don t get as big because the SQN algorithm takes into account the variability of the market, which is always high in bear markets Although this might seem complicated to many people, he says that you can know the market type by just consulting a chart: I use the market SQN as an indicator because I measure it every day, if I want to The market SQN, however, is not meant to tell traders when to get in and out of the market It s meant as a warning that you need different types of trading systems for different market conditions Tharp says that it s easy for anyone to develop a trading system for a single type of market Some buy-and-hold strategies worked well for growth stocks in the late 1990s dot-com bull market, he says Unfortunately, when the bubble burst in 2000, people lost a lot of money holding onto stocks for the following few years Buy and hold works great in certain market conditions, but it produces losses in other market conditions

tell the application id "comappleical" set myToDos to every todo of the calendar "Work" repeat with myCounter from 1 to count of myToDos set myToDo to item myCounter of myToDos if summary of myToDo as string is "Mow the Park" then delete myToDo return end if end repeat end tell

only at design time; setting Disabled to True is similar to commenting out a task so that it remains part of the control flow but as far as the SSIS runtime is concerned, the task doesn t exist. The preferred way to achieve this goal is to use expressions on the precedence constraints that connect the various tasks in the control flow. In addition to the three different constraints that can be used (success, failure, and completion), each precedence constraint can be edited to include an expression that determines whether or not this particular branch of the control flow logic will execute. The expression must have a Boolean return value it must evaluate to true or false and this value controls the conditional execution. Figure 3 illustrates the control flow configuration necessary to implement the required behavior using expressions. Implementing this solution has three primary steps:

The results of the SELECT statement run by the Execute SQL Task are stored in a Boolean package variable named TableExists. To map the value into a Boolean variable, CAST the data type to BIT in the SELECT statement, returning 1 if the table exists, and 0 if not. Each precedence constraint has been edited to apply the Expression and Constraint Evaluation operation option, with the appropriate expression (for one, @TableExists; for the other, !@TableExists) specified to enforce the required logic. Note that the two expressions are both mutually exclusive (they cannot both be true at the same time) and also inclusive there is no condition that s not represented by one of the two expressions. The @TableExists precedence constraint has been edited to specify the Logical OR option this is why the constraints that reference the data flow task are displayed with dotted lines. This is required because, as you ll recall, the two