TFieldDef class

In unit DB

Class to describe one field in a record in a dataset.

Declaration

pascal

TFieldDef = class(TNamedItem)

Inheritance

Descends from it: TSQLDBFieldDef

Description

TFieldDef is used to describe the fields that are present in the data underlying the dataset. For each field in the underlying field, an TFieldDef instance is created when the dataset is opened. This class offers almost no methods, it is mainly a storage class, to store all relevant properties of fields in a record (name, data type, size, required or not, etc.)

Properties

`FieldClass`	public	TField class used for this fielddef.
`FieldNo`	public	Field number.
`CharSize`	public	Character size.
`InternalCalcField`	public	Is this a definition of an internally calculated field ?
`ParentDef`	public
`Required`	public	Is the field required ?
`Codepage`	public	System code page for the values in string and wide string field types.
`Attributes`	published	Additional attributes of the field.
`DataType`	published	Data type for the field.
`ChildDefs`	published
`Precision`	published	Precision used in BCD (Binary Coded Decimal) fields.
`Size`	published	Size of the buffer needed to store the data of the field.

Methods

`Create`	public	Constructor for TFieldDef.
`Destroy`	public	Free the TFieldDef instance.
`AddChild`	public
`Assign`	public	Assign the contents of one TFieldDef instance to another.
`CreateField`	public	Create TField instance based on definitions in current TFieldDef instance.
`HasChildDefs`	public