Unit: ewbdataset

Inherits From TStream

Use the TEWBBlobStream object to access or modify the contents of a BLOB or CLOB column in a dataset using a stream interface. A BLOB column is represented by the TBlobField object, and a CLOB column is represented by a TMemoField object. TBlobField and TMemoField objects use streams to implement many of their data access properties and methods via the standard CreateBlobStream method that is implemented by the Elevate Web Builder TEWBDataSet component.

To use a TEWBBlobStream object, create an instance of TEWBBlobStream class, use the methods of the TEWBBlobStream object to read or write the data, and then free the object. Do not use the same instance of a TEWBBlobStream object to access data from more than one row. Instead, create a new TEWBBlobStream object every time you need to read or write to a BLOB or CLOB column for a row.