Data.DB.TIndexDef.Expression
| [–] Properties | |
|---|---|
| Type: property | |
| Visibility: published | |
| Source: Data.DB.pas Data.DB.hpp
| |
| Unit: Data.DB | |
| Parent: TIndexDef | |
Delphi
property Expression: string read GetExpression write SetExpression;
C++
__property System::UnicodeString Expression = {read=GetExpression, write=SetExpression};
Description
Contains a dBASE key expression.
Read Expression to learn the key expression of a dBASE expression index. This property is only used on the Windows product, where there are components that can represent dBASE tables.
A key expression for a dBASE table is a field name, or a combination of field names, functions, and operators that specifies how the index orders records in the table. If the table is not a dBASE table or the index is not an expression index, Expression is an empty string and the Fields property contains the field(s) for the index. When the index is a dBASE expression index, Expression contains a value and the Fields property contains an empty string.
Note: For more information about key expressions, see your dBASE documentation.