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COLUMNS Rowset

The COLUMNS rowset identifies the columns of tables (including views) defined in the application definition (catalog) that are accessible to a given user.

GUID: DBSCHEMA_COLUMNS

Number of restriction columns: 4

Restriction columns: TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME

Default sort order: TABLE_NAME

Scantron OLE DB Provider implementation of Columns Rowset is as follows:

Column name	Type indicator	Description
TABLE_CATALOG	DBTYPE_WSTR	NULL
TABLE_SCHEMA	DBTYPE_WSTR	NULL
TABLE_NAME	DBTYPE_WSTR	Document Definition Name
COLUMN_NAME	DBTYPE_WSTR	As in Output Record Definition for that document
COLUMN_GUID	DBTYPE_GUID	NULL
COLUMN_PROPID	DBTYPE_UI4	NULL
ORDINAL_POSITION	DBTYPE_UI4	One-based number representing the order in the output record.
COLUMN_HASDEFAULT	DBTYPE_BOOL	VARIANT_TRUE—The column has a default value. VARIANT_FALSE—The column does not have a default value, or it is unknown whether the column has a default value.
COLUMN_DEFAULT	DBTYPE_WSTR	NULL
COLUMN_FLAGS	DBTYPE_UI4	A bitmask that describes column characteristics. The DBCOLUMNFLAGS enumerated type specifies the bits in the bitmask. For information about DBCOLUMNFLAGS, see "IColumnsInfo::GetColumnInfo" in the MSDN reference. This column cannot contain a NULL value. If COLUMN_NAME refers to a column in a table or view that is updatable, one of either DBCOLUMNFLAGS_WRITE or DBCOLUMNFLAGS_WRITEUNKNOWN should be set. For more information about these flags, see "DBCOLUMNFLAGS Enumerated Type" in the MSDN reference.
IS_NULLABLE	DBTYPE_BOOL	VARIANT_TRUE—The column might be nullable. VARIANT_FALSE—The column is known not to be nullable.
DATA_TYPE	DBTYPE_UI2	Type of the data contained in the column. One of the DBTYPE constants defined by OLE DB.
TYPE_GUID	DBTYPE_GUID	NULL
CHARACTER_MAXIMUM_LENGTH	DBTYPE_UI4	The maximum possible length of a value in the column. For character, binary, or bit columns, this is one of the following: The maximum length of the column in characters, bytes, or bits, respectively, if one is defined. For example, a CHAR(5) column in an SQL table has a maximum length of 5. The maximum length of the data type in characters, bytes, or bits, respectively, if the column does not have a defined length. Zero (0) if neither the column nor the data type has a defined maximum length. NULL for all other types of columns.
CHARACTER_OCTET_LENGTH	DBTYPE_UI4	NULL
NUMERIC_PRECISION	DBTYPE_UI2	NULL
NUMERIC_SCALE	DBTYPE_I2	NULL
DATETIME_PRECISION	DBTYPE_UI4	NULL
CHARACTER_SET_CATALOG	DBTYPE_WSTR	NULL
CHARACTER_SET_SCHEMA	DBTYPE_WSTR	NULL
CHARACTER_SET_NAME	DBTYPE_WSTR	NULL
COLLATION_CATALOG	DBTYPE_WSTR	NULL
COLLATION_SCHEMA	DBTYPE_WSTR	NULL
COLLATION_NAME	DBTYPE_WSTR	NULL
DOMAIN_CATALOG	DBTYPE_WSTR	NULL
DOMAIN_SCHEMA	DBTYPE_WSTR	NULL
DOMAIN_NAME	DBTYPE_WSTR	NULL
DESCRIPTION	DBTYPE_WSTR	Field data type from the ScanTools application, (example Alphanumeric, Numeric, 1-digit, 2-digit, Date)
IS_ARCHIVE_INDEX	DBTYPE_BOOL	VARIANT_TRUE—The column is an archive index. VARIANT_FALSE—The column is not an archive index.

See Using Restrictions on Schema Rowsets for information about Filtering rows of COLUMNS Rowset.

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