# ADO OpenSchema Method

Complete Connection Object Reference

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)

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

Complete Connection Object Reference

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