ADO OpenSchema Method

The OpenSchema method returns a Recordset object with schema information from the provider about the data source. For example, schema information can include the names of the tables, names of the columns in the tables, and the data type of each column. The Recordset will be opened as a read-only recordset.

Syntax

Set rs=objconn.OpenSchema(querytype,criteria,schemaid)

Examples

Set objRecordset = 
			objConnection.OpenSchema(adSchemaTables)

Parameter	Description
querytype	Required. A SchemaEnum value that represents the type of schema query to run Note: The OLEDB specification only require 3 of the SchemaEnum values to be supported. These are adSchemaTables, adSchemaColumns, and the adSchemaProviderTypes
criteria	Optional. An array of query constraints for each querytype option, as listed in SchemaEnum
schemaid	The GUID for a provider-schema query not defined by the OLE DB specification. Required if querytype is set to adSchemaProviderSpecific

SchemaEnum Values

Constant	Value	Description	Constraint Columns
adSchemaProviderSpecific	-1	Used if the provider defines its own nonstandard schema queries	Provider specific
adSchemaAsserts	0	Returns the assertions defined in the catalog	CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME
adSchemaCatalogs	1	Returns the physical attributes associated with catalogs accessible from the DBMS	CATALOG_NAME
adSchemaCharacterSets	2	Returns the character sets defined in the catalog	CHARACTER_SET_CATALOG CHARACTER_SET_SCHEMA CHARACTER_SET_NAME
adSchemaCollations	3	Returns the character collations defined in the catalog	COLLATION_CATALOG COLLATION_SCHEMA COLLATION_NAME
adSchemaColumns	4	Returns the columns of tables defined in the catalog	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME
adSchemaCheckConstraints	5	Returns the check constraints defined in the catalog	CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME
adSchemaConstraintColumnUsage	6	Returns the columns used by referential constraints, unique constraints, check constraints, and assertions, defined in the catalog	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME
adSchemaConstraintTableUsage	7	Returns the tables that are used by referential constraints, unique constraints, check constraints, and assertions defined in the catalog	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME
adSchemaKeyColumnUsage	8	Returns the columns defined in the catalog that are constrained as keys	CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME
AdSchemaReferentialConstraints	9	Returns the referential constraints defined in the catalog	CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME
adSchemaTableConstraints	10	Returns the table constraints defined in the catalog	CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME TABLE_CATALOG TABLE_SCHEMA TABLE_NAME CONSTRAINT_TYPE
adSchemaColumnsDomainUsage	11	Returns the columns defined in the catalog that are dependent on a domain defined in the catalog	DOMAIN_CATALOG DOMAIN_SCHEMA DOMAIN_NAME COLUMN_NAME
adSchemaIndexes	12	Returns the indexes defined in the catalog	TABLE_CATALOG TABLE_SCHEMA INDEX_NAME TYPE TABLE_NAME
adSchemaColumnPrivileges	13	Returns the privileges on columns of tables defined in the catalog	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME GRANTOR GRANTEE
adSchemaTablePrivileges	14	Returns the privileges on tables defined in the catalog	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME GRANTOR GRANTEE
adSchemaUsagePrivileges	15	Returns the USAGE privileges on objects defined in the catalog	OBJECT_CATALOG OBJECT_SCHEMA OBJECT_NAME OBJECT_TYPE GRANTOR GRANTEE
adSchemaProcedures	16	Returns the procedures defined in the catalog	PROCEDURE_CATALOG PROCEDURE_SCHEMA PROCEDURE_NAME PROCEDURE_TYPE
adSchemaSchemata	17	Returns the schemas (database objects)	CATALOG_NAME SCHEMA_NAME SCHEMA_OWNER
adSchemaSQLLanguages	18	Returns the conformance levels, options, and dialects supported by the SQL-implementation processing data defined in the catalog.	None
adSchemaStatistics	19	Returns the statistics defined in the catalog	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME
adSchemaTables	20	Returns the tables defined in the catalog that are accessible	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME TABLE_TYPE
adSchemaTranslations	21	Returns the character translations defined in the catalog that are accessible	TRANSLATION_CATALOG TRANSLATION_SCHEMA TRANSLATION_NAME
adSchemaProviderTypes	22	Returns the data types supported by the data provider	DATA_TYPE BEST_MATCH
adSchemaViews	23	Returns the views defined in the catalog that are accessible	TABLE_CATALOG TABLE_SCHEMA TABLE_NAME
adSchemaViewColumnUsage	24	Returns the columns on which viewed tables, are dependent	VIEW_CATALOG VIEW_SCHEMA VIEW_NAME
adSchemaViewTableUsage	25	Returns the tables on which viewed tables, are dependent	VIEW_CATALOG VIEW_SCHEMA VIEW_NAME
adSchemaProcedureParameters	26	Returns info about the parameters and return codes of procedures	PROCEDURE_CATALOG PROCEDURE_SCHEMA PROCEDURE_NAME PARAMETER_NAME
adSchemaForeignKeys	27	Returns the foreign key columns defined in the catalog	PK_TABLE_CATALOG PK_TABLE_SCHEMA PK_TABLE_NAME FK_TABLE_CATALOG FK_TABLE_SCHEMA FK_TABLE_NAME
adSchemaPrimaryKeys	28	Returns the primary key columns defined in the catalog	PK_TABLE_CATALOG PK_TABLE_SCHEMA PK_TABLE_NAME
adSchemaProcedureColumns	29	Returns info about the columns of rowsets returned by procedures	PROCEDURE_CATALOG PROCEDURE_SCHEMA PROCEDURE_NAME COLUMN_NAME
adSchemaDBInfoKeywords	30	Returns a list of provider-specific keywords	None
adSchemaDBInfoLiterals	31	Returns a list of provider-specific literals used in text commands	None
adSchemaCubes	32	Returns info about the available cubes in a schema	CATALOG_NAME SCHEMA_NAME CUBE_NAME
adSchemaDimensions	33	Returns info about the dimensions in a given cube	CATALOG_NAME SCHEMA_NAME CUBE_NAME DIMENSION_NAME DIMENSION_UNIQUE_NAME
adSchemaHierarchies	34	Returns info about the hierarchies available in a dimension	CATALOG_NAME SCHEMA_NAME CUBE_NAME DIMENSION_UNIQUE_NAME HIERARCHY_NAME HIERARCHY_UNIQUE_NAME
adSchemaLevels	35	Returns info about the levels available in a dimension	CATALOG_NAME SCHEMA_NAME CUBE_NAME DIMENSION_UNIQUE_NAME HIERARCHY_UNIQUE_NAME LEVEL_NAME LEVEL_UNIQUE_NAME
adSchemaMeasures	36	Returns info about the available measures	CATALOG_NAME SCHEMA_NAME CUBE_NAME MEASURE_NAME MEASURE_UNIQUE_NAME
adSchemaProperties	37	Returns info about the available properties for each level of the dimension	CATALOG_NAME SCHEMA_NAME CUBE_NAME DIMENSION_UNIQUE_NAME HIERARCHY_UNIQUE_NAME LEVEL_UNIQUE_NAME MEMBER_UNIQUE_NAME PROPERTY_TYPE PROPERTY_NAME
adSchemaMembers	38	Returns info about the available members	CATALOG_NAME SCHEMA_NAME CUBE_NAME DIMENSION_UNIQUE_NAME HIERARCHY_UNIQUE_NAME LEVEL_UNIQUE_NAME LEVEL_NUMBER MEMBER_NAME MEMBER_UNIQUE_NAME MEMBER_CAPTION MEMBER_TYPE TREE OPERATOR
adSchemaTrustees	39	For future use	None