Unit 'DB' Package
[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] [#fcl]

TFieldDef.Create

Constructor for TFieldDef.

Declaration

Source position: db.pas line 197

public constructor TFieldDef.Create(

  ACollection: TCollection

); override;

constructor TFieldDef.Create(

  AOwner: TFieldDefs;

  const AName: string;

  ADataType: TFieldType;

  ASize: Integer;

  ARequired: Boolean;

  AFieldNo: LongInt;

  ACodePage: TSystemCodePage = CP_ACP

); overload;

Arguments

ACollection

  

TFieldDefs instance to which to append the definition, or Nil.

Arguments

AOwner

  

Owner of the fielddef.

AName

  

Name of the field.

ADataType

  

Data type of the field.

ASize

  

Storage size for the field contents, or zero for fixed-size fields.

ARequired

  

Is the fields required or not.

AFieldNo

  

Number of the field.

ACodePage

  

Codepage for the string field.

Description

Create is the constructor for the TFieldDef class.

If a simple call is used, with a single argument ACollection, the inherited Create is called and the Field number is set to the incremented current index.

If the more complicated call is used, with multiple arguments, then after the inherited Create call, the Name, datatype, size, precision, FieldNo, Required and CodePage property are all set according to the passed arguments.

Errors

If a duplicate name is passed, then an exception will occur.

See also

Name

datatype

  

Data type for the field.

size

  

Size of the buffer needed to store the data of the field.

precision

  

Precision used in BCD (Binary Coded Decimal) fields.

FieldNo

  

Field number.

Required

  

Is the field required ?

CodePage

  

System code page for the values in string and wide string field types.


Documentation generated on: Nov 22 2024