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ADO OpenSchema Method


Connection Object Reference 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


Connection Object Reference Complete Connection Object Reference

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