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ADO OpenSchema 方法
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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.OpenSchema方法的作用是：返回带有数据源提供者Schema信息的Recordset对象。举例来说，schema信息可以包括表名称、表中的列名称以及每一列的数据类型。Recordset将以制度的方式打开。
Syntax
语法
Set rs=objconn.OpenSchema(querytype,criteria,schemaid) |
| Parameter参数 | Description描述 |
|---|---|
| querytype | Required. A SchemaEnum value that represents the type of schema query to run 必要参数。用来代表所运行的Schema查询语句类型的一个SchemaEnum值 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 可选参数。一个查询数组，用于限制querytype选项，具体请见SchemaEnum |
| schemaid | The GUID for a provider-schema query not defined by the OLE DB specification. Required if querytype is set to adSchemaProviderSpecific 在OLE DB规范中并未定义provider-schema查询语句的GUID。如果querytype [查询类型]被设置为adSchemaProviderSpecific，那么必须设置该参数 |
SchemaEnum Values
| Constant 常量 | Value 值 | Description 描述 | Constraint Columns 限制列 |
|---|---|---|---|
| adSchemaProviderSpecific | -1 | Used if the provider defines its own nonstandard schema queries 如果技术提供对象定义了本身的非标准Schema查询语句时使用该常量 | Provider specific |
| adSchemaAsserts | 0 | Returns the assertions defined in the catalog 返回在目录中定义的声明 | CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME |
| adSchemaCatalogs | 1 | Returns the physical attributes associated with catalogs accessible from the DBMS 返回与DBMS的目录及相关的物理属性 | CATALOG_NAME |
| adSchemaCharacterSets | 2 | Returns the character sets defined in the catalog 返回在目录中定义的字符设置 | CHARACTER_SET_CATALOG CHARACTER_SET_SCHEMA CHARACTER_SET_NAME |
| adSchemaCollations | 3 | Returns the character collations defined in the catalog 返回在目录中定义的字符校对 | COLLATION_CATALOG COLLATION_SCHEMA COLLATION_NAME |
| adSchemaColumns | 4 | Returns the columns of tables defined in the catalog 返回在目录中定义的表列 | TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME |
| adSchemaCheckConstraints | 5 | Returns the check constraints defined in the catalog 返回目录中定义检查限制 | 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 返回目录中定义的通过指示限制、独立限制、检查限制和声明所使用的列 | 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 返回目录中定义的通过指示限制、独立限制、检查限制和声明所使用的表 | TABLE_CATALOG TABLE_SCHEMA TABLE_NAME |
| adSchemaKeyColumnUsage | 8 | Returns the columns defined in the catalog that are constrained as keys 返回目录中定义的列。该目录被限制为键[key] | CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME |
| AdSchemaReferentialConstraints | 9 | Returns the referential constraints defined in the catalog 返回目录中定义的指示限制 | CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME |
| adSchemaTableConstraints | 10 | Returns the table constraints defined in the catalog 返回目录中定义的表限制 | 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 返回目录中定义的列限制。该目录是由目录中定义的域名决定的 | DOMAIN_CATALOG DOMAIN_SCHEMA DOMAIN_NAME COLUMN_NAME |
| adSchemaIndexes | 12 | Returns the indexes defined in the catalog 返回目录中定义的索引[Index] | TABLE_CATALOG TABLE_SCHEMA INDEX_NAME TYPE TABLE_NAME |
| adSchemaColumnPrivileges | 13 | Returns the privileges on columns of tables defined in the catalog 返回目录中定义的表列特权 | TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME GRANTOR GRANTEE |
| adSchemaTablePrivileges | 14 | Returns the privileges on tables defined in the catalog 返回目录中定义的表特权 | TABLE_CATALOG TABLE_SCHEMA TABLE_NAME GRANTOR GRANTEE |
| adSchemaUsagePrivileges | 15 | Returns the USAGE privileges on objects defined in the catalog 返回目录中定义的对象用法权限 | OBJECT_CATALOG OBJECT_SCHEMA OBJECT_NAME OBJECT_TYPE GRANTOR GRANTEE |
| adSchemaProcedures | 16 | Returns the procedures defined in the catalog 返回目录中定义的程序 | PROCEDURE_CATALOG PROCEDURE_SCHEMA PROCEDURE_NAME PROCEDURE_TYPE |
| adSchemaSchemata | 17 | Returns the schemas (database objects) 返回schema（数据库对象） | 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. 返回目录中定义的SQL执行程序所支持的适应性级别和选项 | None |
| adSchemaStatistics | 19 | Returns the statistics defined in the catalog 返回母丁中定义的统计表 | TABLE_CATALOG TABLE_SCHEMA TABLE_NAME |
| adSchemaTables | 20 | Returns the tables defined in the catalog that are accessible 返回目录中定义的表。该目录是可以访问的 | TABLE_CATALOG TABLE_SCHEMA TABLE_NAME TABLE_TYPE |
| adSchemaTranslations | 21 | Returns the character translations defined in the catalog that are accessible 返回目录中定义的字符事务。该目录是可以访问的 | TRANSLATION_CATALOG TRANSLATION_SCHEMA TRANSLATION_NAME |
| adSchemaProviderTypes | 22 | Returns the data types supported by the data provider 返回data provider[数据提供者]支持的数据类型 | DATA_TYPE BEST_MATCH |
| adSchemaViews | 23 | Returns the views defined in the catalog that are accessible 返回目录中定义的查看内容。该目录是可以访问的 | TABLE_CATALOG TABLE_SCHEMA TABLE_NAME |
| adSchemaViewColumnUsage | 24 | Returns the columns on which viewed tables, are dependent 返回由可视表对象所决定的列 | VIEW_CATALOG VIEW_SCHEMA VIEW_NAME |
| adSchemaViewTableUsage | 25 | Returns the tables on which viewed tables, are dependent 返回由可视表对象所决定的表 | VIEW_CATALOG VIEW_SCHEMA VIEW_NAME |
| adSchemaProcedureParameters | 26 | Returns info about the parameters and return codes of procedures 返回参数信息以及程序代码 | PROCEDURE_CATALOG PROCEDURE_SCHEMA PROCEDURE_NAME PARAMETER_NAME |
| adSchemaForeignKeys | 27 | Returns the foreign key columns defined in the catalog 返回在目录中定义的foreign键 | 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 返回在目录中定义的私钥 | PK_TABLE_CATALOG PK_TABLE_SCHEMA PK_TABLE_NAME |
| adSchemaProcedureColumns | 29 | Returns info about the columns of rowsets returned by procedures 返回通过程序返回的rowset列信息 | PROCEDURE_CATALOG PROCEDURE_SCHEMA PROCEDURE_NAME COLUMN_NAME |
| adSchemaDBInfoKeywords | 30 | Returns a list of provider-specific keywords 返回技术提供者详细键的列表 | None |
| adSchemaDBInfoLiterals | 31 | Returns a list of provider-specific literals used in text commands 返回在文本命令中使用的提供者的详细文字列表 | None |
| adSchemaCubes | 32 | Returns info about the available cubes in a schema 返回Schema中可使用的三位数组信息 | CATALOG_NAME SCHEMA_NAME CUBE_NAME |
| adSchemaDimensions | 33 | Returns info about the dimensions in a given cube 返回一个位于给定三位数组内的维数信息 | CATALOG_NAME SCHEMA_NAME CUBE_NAME DIMENSION_NAME DIMENSION_UNIQUE_NAME |
| adSchemaHierarchies | 34 | Returns info about the hierarchies available in a dimension 返回在一个维数内可使用的层次信息 | 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 返回在数组为数范围内可以使用的等级信息 | 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 返回可以利用的方法相关的信息 | 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 为不同级别数组维数返回可以使用的属性信息 | 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 返回可使用的成员信息 | 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 为将来使用 | None |
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