后续版本的 Microsoft SQL Server 将删除该功能。请避免在新的开发工作中使用该功能，并着手修改当前还在使用该功能的应用程序。
The ColumnType property returns the base data type of a column in the current result set of a QueryResults object.
语法
object
.ColumnType(
OrdinalColumn
)
Parts
- object
An expression that evaluates to an object in the Applies To list
- OrdinalColumn
A long integer that specifies the column in the results by position
Data Type
Long, enumerated
Modifiable
Read-only
Prototype (C/C++)
HRESULT GetColumnType(long nColumn,
SQLDMO_QUERY_DATATYPE* pRetVal);
Returns
The value returned by ColumnType is evaluated using these SQLDMO_QUERY_DATATYPE values.
| Constant | Value | Description |
|---|---|---|
SQLDMO_DtypeBigint |
-5 |
bigint data type. |
SQLDMO_DTypeBinary |
-2 |
Fixed length binary data. |
SQLDMO_DTypeBit |
-7 |
Unsigned integer data. The width of the integer is one byte. |
SQLDMO_DTypeChar |
1 |
Fixed length character. |
SQLDMO_DTypeDateTime |
-2 |
ODBC SQL_TIMESTAMP_STRUCT. |
SQLDMO_DTypeDateTime4 |
93 |
ODBC SQL_TIMESTAMP_STRUCT. |
SQLDMO_DTypeFloat4 |
7 |
Approximate numeric data. The width of the numeric value is four bytes. |
SQLDMO_DTypeFloat8 |
8 |
Approximate numeric data. The width of the numeric value is eight bytes. |
SQLDMO_DTypeGUID |
-11 |
Globally unique identifier (GUID). The data is a data structure 16 bytes in length. |
SQLDMO_DTypeImage |
-4 |
Long, variable length binary data. |
SQLDMO_DTypeInt1 |
-6 |
Unsigned integer data. The width of the integer is one byte. |
SQLDMO_DTypeInt2 |
5 |
Signed integer data. The width of the integer is two bytes. |
SQLDMO_DTypeInt4 |
4 |
Signed integer data. The width of the integer is four bytes. |
SQLDMO_DTypeMoney |
3 |
Scaled integer data represented as a string value. |
SQLDMO_DTypeMoney4 |
3 |
Scaled integer data represented as a string value. |
SQLDMO_DTypeNText |
-10 |
Long, variable length, Unicode character data. |
SQLDMO_DTypeSQLVariant |
-150 |
sql_variant data type. |
SQLDMO_DTypeText |
-1 |
Long, variable length character data. |
SQLDMO_DTypeUChar |
-8 |
Fixed length, Unicode character data. |
SQLDMO_DTypeUnknown |
0 |
A data type value that is unsupported or not valid. |
SQLDMO_DTypeUVarchar |
-9 |
Variable length, Unicode character data. |
SQLDMO_DTypeVarBinary |
-3 |
Variable length binary data. |
SQLDMO_DTypeVarchar |
12 |
Variable length character data. |