Column Properties

The DBPROPSET_COLUMN property set contains the following properties. All of these properties are in the Column property group.

Property ID	Description
DBPROP_COL_AUTOINCREMENT	Type: VT_BOOL Typical R/W: R/W Description: Autoincrement Specifies whether the values of the column are autoincrementing, that is: VARIANT_TRUE, which indicates the values of the column are autoincrementing. VARIANT_FALSE, which indicates the values of the column are not autoincrementing.
DBPROP_COL_DEFAULT	Type: Any Typical R/W: R/W Description: Default A VARIANT value that specifies the default value for an object—typically a domain or column. If the default value is a string, the string must be surrounded by double quotation marks to distinguish it from an object of the same name.
DBPROP_COL_DESCRIPTION	Type: VT_BSTR Typical R/W: R/W Description: Description
DBPROP_COL_FIXEDLENGTH	Type: VT_BOOL Typical R/W: R/W Description: Fixed Length Specifies whether a column is fixed-length or variable-length, that is: VARIANT_TRUE, which indicates the column is fixed-length. ulColumnSize in the DBCOLUMNDESC structure contains the fixed-length value. VARIANT_FALSE (or not specified), which indicates the column is variable-length. ulColumnSize in the DBCOLUMNDESC structure contains the maximum size of the column. For information about the DBCOLUMNDESC structure, see ITableDefinition::CreateTable in the OLE DB Programmer's Reference.
DBPROP_COL_NULLABLE	Type: VT_BOOL Typical R/W: R/W Description: Nullable Specifies whether a column can contain a NULL value, that is: VARIANT_TRUE, which indicates the column can contain NULL values. VARIANT_FALSE, which indicates the column cannot contain NULL values.