OleDbSchemaGuid::Constraint_Column_Usage Field
Returns the columns used by referential constraints, unique constraints, check constraints, and assertions, defined in the catalog and owned by a given user.
Assembly: System.Data (in System.Data.dll)
Field Value
Type: System::GuidConstraint_Column_Usage maps to the OLE DB CONSTRAINT_COLUMN_USAGE rowset. Unless otherwise specified, restriction columns are returned in the following order.
Restriction column | CLR data type | Description |
|---|---|---|
TABLE_CATALOG | string | Catalog name in which the table is defined. A null value if the provider does not support catalogs. |
TABLE_SCHEMA | string | Unqualified schema name in which the table is defined. A null value if the provider does not support schemas. |
TABLE_NAME | string | Table name. |
COLUMN_NAME | string | Column name. This column, together with the COLUMN_GUID and COLUMN_PROPID columns, forms the column ID. One or more of these columns will be a null value, depending on which elements of the DBID structure the provider uses. |
CONSTRAINT_CATALOG | string | Catalog name. A null value if the provider does not support catalogs. |
CONSTRAINT_SCHEMA | string | Unqualified schema name. A null value if the provider does not support schemas. |
CONSTRAINT_NAME | string | Constraint name. |
Available since 1.1