TdxStorageItemCustomDataBinding.ValueType Property
Specifies the name of the active data type.
Declaration
property ValueType: string read; write;
Property Value
Type | Description |
---|---|
string | The name of the active data type (case-insensitive). Refer to the table in the Remarks section for the list of supported value type names. |
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. |
-
The
ValueType
property setter updates the ValueTypeClass property according to the assigned value. -
The ValueTypeClass property setter updates the
ValueType
property according to the assigned value. -
This column lists the corresponding TFieldType values.
-
'SQLTimeStamp'
also corresponds to the TSQLTimeStamp type. -
Use this value type with those controls and editors that support BLOB.
-
Use this type only in custom or inherited components because DevExpress and standard VCL components have no information on actual content of such values.