Filter() 函数自带 Retrieve 功能吗？

[helysan]

Filter() 函数自带 Retrieve 功能吗？我看到有的代码只用到 Filter(),感觉应该有 retrieve 操作才对，是不是 filter()自带了 retrieve 功能？如果要带此功能，怎么设置？

[1TH]

(ZT)

Usage

Filter causes all rows to be retrieved and then it applies the filter. Even when the Retrieve As Needed option is set, the Filter method retrieves all rows before applying the filter.
Filter uses the current filter criteria for the DataWindow. To change the filter criteria, use the SetFilter method. The SetFilter method is equivalent to using the Filter command on the Rows menu of the DataWindow painter. If you do not call SetFilter to assign or change criteria before calling the Filter method, the DataWindow will default to use the criteria in the object definition.

When the Retrieve method retrieves data for the DataWindow, PowerBuilder applies the filter that was defined for the DataWindow object, if any. You only need to call Filter after you change the filter criteria with SetFilter or if the data has changed because of processing or user input.
Filter has no effect on the DataWindows in a composite report.