TBCDField¶

Field class for Binary Coded Decimal (BCD) values.

Declaration¶

Source position: db.pas line 986

type

  TBCDField = class(TNumericField)
  public
    constructor Create;
    function CheckRange : Boolean;
    property Value: Currency; {rw}
  published
    property Precision: LongInt; {rw}
    property Currency: Boolean; {rw}
    property MaxValue: Currency; {rw}
    property MinValue: Currency; {rw}
    property Size; {d}
  end;

Inheritance¶

Description¶

TBCDField is the class used when a dataset must manage data of Binary Coded Decimal type. (TField.DataType equals ftBCD). It initializes some of the properties of the TField class, and overrides some of its methods to be able to work with BCD fields.

TBCDField assumes that the field's contents can be stored in a currency type, i.e. the maximum number of decimals after the decimal separator that can be stored in a TBCDField is 4. Fields that need to store a larger amount of decimals should be represented by a TFMTBCDField instance.

It should never be necessary to create an instance of TBCDField manually, a field of this class will be instantiated automatically for each BCD field when a dataset is opened.

Properties¶

Member	Visibility	Description
Currency	published	Does the field represent a currency amount.
MaxValue	published	Maximum value for the field.
MinValue	published	Minimum value for the field.
Precision	published	Precision of the BCD field.
Size read only	published	Number of decimals after the decimal separator.
Value	public	Value of the field contents as a Currency type.

See all Properties

Methods¶

Member	Visibility	Description
CheckRange	public	Check whether a values falls within the allowed range.
Create	public	Create a new instance of a TBCDField class.

See all Methods

Name	Description
TDataset	Base class for records-based data-access.
TField	Provide access to the contents of a single field in a record.
TFMTBCDField	Fixed precision floating point data field.