DataType Element (ASSL)
Defines the data type of the associated element.
语法
<DataItem> <!-- or Measure -->
...
<DataType>...</DataType>
...
</DataItem>
Element Characteristics
| Characteristic | Description |
|---|---|
Data type and length |
String (enumeration) |
Default value |
None |
Cardinality |
0-1: Optional element that can occur once and only once. |
Element Relationships
| Relationship | Element |
|---|---|
Parent element |
|
Child elements |
None |
备注
The values for DataType are defined in the System.Data.OleDb.OleDbType enumeration. However, only the enumeration values in the following table are valid in the DataType element.
Value
Description
BigInt
A 64-bit signed integer. This data type maps to the Int64 data type in Microsoft .NET Framework and the DBTYPE_I8 data type in OLE DB.
Bool
A Boolean value. This data type maps to the Boolean data type in the .NET Framework and the DBTYPE_BOOL data type in OLE DB.
Currency
A currency value ranging from -263 (or -922,337,203,685,477.5808) to 263-1 (or +922,337,203,685,477.5807) with an accuracy to a ten-thousandth of a currency unit. This data type maps to the Decimal data type in the .NET Framework and the DBTYPE_CY data type in OLE DB.
Date
Date data, stored as a double-precision floating point number. The whole portion is the number of days since December 30, 1899, while the fractional portion is a fraction of a day. This data type maps to the DateTime data type in the .NET Framework and the DBTYPE_DATE data type in OLE DB.
Double
A double-precision floating point number within the range of -1.79E +308 through 1.79E +308. This data type maps to the Double data type in the .NET Framework and the DBTYPE_R8 data type in OLE DB.
Integer
A 32-bit signed integer. This data type maps to the Int32 data type in the .NET Framework and the DBTYPE_I4 data type in OLE DB.
Single
A single-precision floating point number within the range of -3.40E +38 through 3.40E +38. This data type maps to the Single data type in .NET Framework and the DBTYPE_R4 data type in OLE DB.
SmallInt
A 16-bit signed integer. This data type maps to the Int16 data type in the .NET Framework and the DBTYPE_I2 data type in OLE DB.
TinyInt
An 8-bit signed integer. This data type maps to the SByte data type in the .NET Framework and the DBTYPE_I1 data type in OLE DB.
UnsignedBigInt
A 64-bit unsigned integer. This data type maps to the UInt64 data type in .NET Framework and the DBTYPE_UI8 data type in OLE DB.
UnsignedInt
A 32-bit unsigned integer. This data type maps to the UInt32 data type in the .NET Framework and the DBTYPE_UI4 data type in OLE DB.
UnsignedSmallInt
A 16-bit unsigned integer. This data type maps to the UInt16 data type in the .NET Framework and the DBTYPE_UI2 data type in OLE DB.
WChar
A null-terminated stream of Unicode characters. This data type maps to the String data type in the .NET Framework and the DBTYPE_WSTR data type in OLE DB.
Inherited
The data type of the DataItem contained in the Source element of the Measure element.
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注意：
Applicable only to Measure elements.