Part of Studio for ActiveX and Studio Enterprise, True DataControl 8.0 is an ActiveX® control that replaces the VB data control with scores of added features to free you from the hours of coding formerly needed to build intuitive database front-end applications.
特征综述 About Feature
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- Field modifications
True DataControl can recognize changes to fields made by the end-user at the moment a change has been made, so you don’t have to write event procedures for all kinds of controls. No more click events in your code! - Filters
True DataControl supports filter expressions restricting the contents of the data source. - Control properties
You can assign formulas to any properties of any controls on the form, even if they are not data-aware. True DataControl will automatically change the property each time the formula changes. - SQL with parameters
A limitation of all standard Visual Basic data sources prohibits the use of parameters in the underlying SQL statement at design time. True DataControl remedies this limitation and even allows expressions to be assigned to parameters, so they may be used without any manual coding. - Calculated fields
All you need to create a calculated field dependent on the values of other fields is to define a formula. True DataControl will maintain the field’s value and update it automatically. - Default values
You can specify the value to be assigned to a field in a new record, and even make it dependent on parameters. - Data in memory
True DataControl can be used to manage data in memory arrays/variables in exactly the same way as it manages data of a database origin. Just define the fields at design time, and True DataControl will create internal memory storage. This powerful feature enhances all Microsoft and third-party data-aware controls, enabling them to be used in applications and forms that are not necessarily database-related. - Custom data sources
As an alternative to database and memory array data sources, you can create customized data sources with event-driven code. This advanced feature is ideal for legacy data and proprietary file formats. - Field and record constraints
Validation conditions, or constraints, can be imposed upon individual fields and/or upon the record as a whole. True DataControl will automatically test the constraints when the user changes a field or posts a modified record.
更新时间:2008-2-26 | 录入时间:2005-8-18 | 编辑:liuzh | 审核:lijm
