OleDbSchemaGuid.Key_Column_Usage Field

Definition

Namespace:

System.Data.OleDb

Assembly:

System.Data.OleDb.dll

Package:

System.Data.OleDb v9.0.0-rc.2.24473.5

Returns the columns defined in the catalog that is constrained as keys by a given user.

public: static initonly Guid Key_Column_Usage;

public static readonly Guid Key_Column_Usage;

 staticval mutable Key_Column_Usage : Guid

Public Shared ReadOnly Key_Column_Usage As Guid 

Field Value

Guid

Remarks

Key_Column_Usage maps to the OLE DB KEY_COLUMN_USAGE rowset. Unless otherwise specified, restriction columns are returned in the following order.

Restriction column	CLR data type	Description
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.
TABLE_CATALOG	string	Catalog name in which the table containing the key column is defined. A null value if the provider does not support catalogs.
TABLE_SCHEMA	string	Unqualified schema name in which the table containing the key column is defined. A null value if the provider does not support schemas.
TABLE_NAME	string	Table name containing the key column.
COLUMN_NAME	string	Name of the column participating in the unique, primary, or foreign key. 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. (DBID is a formal structure serialized into the COLUMN_NAME column of the COLUMN_DOMAIN_USAGE rowset.)