TdxStorageItemCustomDataBinding.ValueTypeClass Property

Specifies the reference to the value type class that corresponds to the used data type.

Declaration

property ValueTypeClass: TcxValueTypeClass read; write;

Property Value

Type	Description
TcxValueTypeClass	The class-reference to the value type class that corresponds to the used data type. Refer to the Remarks section for the list of supported data types.

Remarks

Use the ValueType or ValueTypeClass property to change the data type of stored values. The following table lists supported value types and the corresponding property values.

ValueType[1] Value	ValueTypeClass[2] Value	TFieldType[3] Value	Description
'String'	TcxStringValueType	ftString	Unicode string values.
'WideString'	TcxWideStringValueType	ftWideString	Wide string values.
'Smallint'	TcxSmallintValueType	ftSmallint	16-bit signed integer values.
'Integer'	TcxIntegerValueType	ftInteger	32-bit signed integer values.
'Word'	TcxWordValueType	ftWord	16-bit unsigned integer values.
'Boolean'	TcxBooleanValueType	ftBoolean	Boolean values.
'Single'	TcxSingleValueType	ftSingle	Single precision floating-point values.
'Float'	TcxFloatValueType	ftFloat	Double precision floating-point values.
'Currency'	TcxCurrencyValueType	ftCurrency	Monetary values.
'DateTime'	TcxDateTimeValueType	ftDateTime	Date and time values.
'LargeInt'	TcxLargeIntValueType	ftLargeInt	64-bit signed integer values.
'FMTBcd'	TcxFMTBcdValueType	ftFMTBcd	Binary-encoded decimal values that can be converted to Currency without a loss of precision.
'SQLTimeStamp'	TcxSQLTimeStampValueType	ftTimeStamp[4]	High-precision date and time values.
'Variant'	TcxVariantValueType	ftVariant	Values of any type.
'BLOB'[5]	TcxBLOBValueType	fsBlob	BLOBs (Binary Large OBjects) as values. BLOB values are most often used for storing files in a database.
'Object'[6]	TcxObjectValueType	ftObject	Values that store non-visual objects (TObject descendant instances) with arbitrary data for an unbound editor or Data Grid item.

Footnotes

1. The ValueType property setter updates the ValueTypeClass property according to the assigned value.

2. The ValueTypeClass property setter updates the ValueType property according to the assigned value.

3. This column lists the corresponding TFieldType values.

4. 'SQLTimeStamp' also corresponds to the TSQLTimeStamp type.

5. Use this value type with those controls and editors that support BLOB.

6. Use this type only in custom or inherited components because DevExpress and standard VCL components have no information on actual content of such values.