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DbfNullColumn Class

X#
Class for reading / writing the Special Column for NULL values.
Inheritance Hierarchy
Object
  RddFieldInfo
    DbfColumn
      DbfNullColumn

Namespace:  XSharp.RDD
Assembly:  XSharp.Rdd (in XSharp.Rdd.dll) Version: 2.18
Syntax
 CLASS DbfNullColumn INHERIT DbfColumn
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The DbfNullColumn type exposes the following members.

Constructors
  NameDescription
Public methodDbfNullColumn
Initializes a new instance of the DbfNullColumn class
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Properties
  NameDescription
Public propertyCanSort
Can the field be sorted?
(Inherited from RddFieldInfo.)
Public propertyCaption (Inherited from RddFieldInfo.)
Public propertyColumnName (Inherited from RddFieldInfo.)
Public propertyDescription (Inherited from RddFieldInfo.)
Public propertyFieldTypeStr
Field type as 1 character string.
(Inherited from RddFieldInfo.)
Public propertyFormat (Inherited from RddFieldInfo.)
Public propertyHasProperties (Inherited from RddFieldInfo.)
Public propertyInputMask (Inherited from RddFieldInfo.)
Public propertyIsAutoIncrement
Is it an autoincrement ?
(Inherited from RddFieldInfo.)
Public propertyIsBinary
Is it binary ?
(Inherited from RddFieldInfo.)
Public propertyIsCompressed
Is it a compressed field (not implemented yet) ?
(Inherited from RddFieldInfo.)
Public propertyIsEncrypted
Is it an encryped field (not implemented yet)?
(Inherited from RddFieldInfo.)
Public propertyIsMemo
Is it a memo ?
(Inherited from RddFieldInfo.)
Public propertyIsNullable
Is it nullable ?
(Inherited from RddFieldInfo.)
Public propertyIsStandard
Is it a standard Dbase 3 field (CDLMN) ?
(Inherited from RddFieldInfo.)
Public propertyIsUnicode
Is it a unicode text ?
(Inherited from RddFieldInfo.)
Public propertyIsVarLength
Is it a variable length field ?
(Inherited from RddFieldInfo.)
Public propertyIsVfp
Is it a VFP extended field ?
(Inherited from RddFieldInfo.)
Public propertyProperties
Dynamic list of optional properties, such as Caption, Description.
(Inherited from RddFieldInfo.)
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Methods
  NameDescription
Public methodBlankValue
Return the blank (non null) value of the column.
(Inherited from RddFieldInfo.)
Public methodClone
Clone a RddFieldInfo object.
(Inherited from RddFieldInfo.)
Public methodCopyValues
Copy values from one object to another.
(Inherited from RddFieldInfo.)
Public methodEmptyValue
Get the default "empty" value, as you would get at EOF
(Inherited from DbfColumn.)
Public methodGetBit
Read a bit from the specified position
Public methodGetValue
Get the value from the buffer
(Overrides GetValue(Byte).)
Public methodHandleNullValue
Handle NULL values.
(Inherited from DbfColumn.)
Public methodInitValue
Initialize the buffer used for appends. Gets called once when a DBF is opened.
(Overrides InitValue(Byte).)
Public methodNewRecord
Update the buffer after appending. For example for AutoIncrement or TimeStamp columns.
(Inherited from DbfColumn.)
Public methodPutValue
Write the value to the buffer
(Overrides PutValue(Object, Byte).)
Public methodSameType
Check if two fields match in type, length and decimals.
(Inherited from RddFieldInfo.)
Public methodSetBit
Set a bit at the specified position
Public methodToString (Inherited from RddFieldInfo.)
Public methodValidate
Validate combinations of type, length and decimals.
(Inherited from RddFieldInfo.)
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Fields
  NameDescription
Public fieldAlias
Alternative name, no length limit. This is the Caption for VFP fields
(Inherited from RddFieldInfo.)
Public fieldDecimals
Decimal positions
(Inherited from RddFieldInfo.)
Public fieldFieldType
Field Type
(Inherited from RddFieldInfo.)
Public fieldFlags
Flags, such as Nullable, AutoIncrement, Binary etc.
(Inherited from RddFieldInfo.)
Public fieldLength
Physical length in the table
(Inherited from RddFieldInfo.)
Public fieldName
Name, normally max 10 characters
(Inherited from RddFieldInfo.)
Public fieldOffset
Offset in the record buffer for DBF fields.
(Inherited from RddFieldInfo.)
Public fieldOrdinal
1 based Ordinal position in the RDD.
(Inherited from RddFieldInfo.)
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See Also