MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties

DBPROP_ALTERCOLUMN

Property group: Data Source Information

Property set: DBPROPSET_DATASOURCEINFO

Type: VT_I4

Typical R/W: R

Description: Alter Column Support

Comprises a bitmask describing which portions of the DBCOLUMNDESC structure can be used in a call to IAlterTable::AlterColumn.

Value is a combination of one or more of the following:

• DBCOLUMNDESCFLAGS_TYPENAME
  
  
• DBCOLUMNDESCFLAGS_ITYPEINFO
  
  
• DBCOLUMNDESCFLAGS_PROPERTIES
  
  
• DBCOLUMNDESCFLAGS_CLSID
  
  
• DBCOLUMNDESCFLAGS_COLSIZE
  
  
• DBCOLUMNDESCFLAGS_DBCID
  
  
• DBCOLUMNDESCFLAGS_WTYPE
  
  
• DBCOLUMNDESCFLAGS_PRECISION
  
  
• DBCOLUMNDESCFLAGS_SCALE

For more information about the mapping of these values to fields in the DBCOLUMNDESC structure, see the description of the ColumnDescFlags parameter in the reference entry for IAlterTable::AlterColumn.