Duration: 17:09 min
Description:Field is the element of dataset. In the real world application, you will intensively work with fields. The basic type of field is TField object and it has different descendant for different data type, for example TFloatField, TIntegerField, TStringField, etc.This video will talk about usage of ClientDataset’s fields or dataset’s fields in common. We will see how to access field at run-time from dataset, as well as getting field value of current record. We also talk about enumerating field to access all of dataset field.At design time, we will create persistent fields and then we will change any field property with Object Inspector. Calculated field, a field that doesn’t hold any data but can be used to display any calculation from another field, will be covered by this video.The last topic covered in this video is Lookup Field, a field that its value can be selected from another dataset.This video is the third part of a video set about Building Database Application with Delphi, Firebird and dbExpress.