在Script窗格中选择任何映射语句，这将显示该语句中所引用的所有源和目标可映射对象，如映射源、循环迭代器、条件、where子句，等等。
Selecting any mapping statement in the Script Pane shows all source and target mappables referenced in the statement, such as mapping source, loop iterator, condition, where clause, and so on.
因而在查询界面中用户只需选择或直接输入查询条件，控件可自动转换为相应的SQL查询语句。
Therefore, users just need to choose or input the query conditions directly, then the control will converse them to corresponding SQL query sentences automatically .
根据条件从两个语句中选择一个要运行的语句。
Chooses one of two statements to run depending on a condition.
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