XPObject

• Nov 21, 2018

Persistent objects - objects that can be saved to and restored from a data store. Persistent objects represent the records in a table and encapsulate all the required relationships. The field values are represented as properties. Therefore a data table is merely represented by a collection of persistent objects. With eXpress Persistent Objects you will never have to deal with table mapping - all you need to do is to define persistent object classes, and XPO will automatically generate a database for them.

 

Note

XPO classes can’t be used as design-time Data Sources in VS 2005 since the base XPBaseObject class implements the System.ComponentModel.ICustomTypeDescriptor interface to provide dynamic type information. You should use, for example, the XPCollection or XPView as a data source for editors and grids.

Concepts

• XPO Classes Comparison
• Creating a Persistent Object
• Saving Persistent Objects
• Deleting Persistent Objects
• Validating Objects
• Basics of Creating Persistent Objects for Existing Data Tables
• Generating Persistent Objects for Existing Data Tables

Task-Based Help

• How to: Create an Aggregated Object
• How to: Handle Persistent Object Initialization
• How to: Prevent Changes in a Persistent Object from being Automatically Committed