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‎docs/data/oledb/caccessor-class.md‎

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class CAccessor : public CAccessorBase, public T
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```
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#### Parameters
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### Parameters
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*T*
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The user record class.
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‎docs/data/oledb/caccessorrowset-class.md‎

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|[CAccessorRowset](#caccessorrowset)|Constructor.|
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|[Close](#close)|Closes the rowset and any accessors.|
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|[FreeRecordMemory](#freerecordmemory)|Frees any columns in the current record that need to be freed.|
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|[GetColumnInfo](#getcolumninfo)|Implements [IColumnsInfo::GetColumnInfo](https://msdn.microsoft.com/en-us/library/ms722704.aspx).|
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|[GetColumnInfo](#getcolumninfo)|Implements [IColumnsInfo::GetColumnInfo](https://msdn.microsoft.com/library/ms722704.aspx).|
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## Remarks
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Class `TAccessor` manages the accessor. Class *TRowset* manages the rowset.

‎docs/data/oledb/cmyprovidersource-myproviderds-h.md‎

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## COM Map
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Whenever the client calls `QueryInterface` for an interface on the data source, it goes through the following COM map:
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```cpp
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```
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BEGIN_COM_MAP(CMyProviderSource)
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COM_INTERFACE_ENTRY(IDBCreateSession)
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COM_INTERFACE_ENTRY(IDBInitialize)
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## Property Map
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The property map specifies all the properties designated by the provider:
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```cpp
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```
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BEGIN_PROPSET_MAP(CMyProviderSource)
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BEGIN_PROPERTY_SET(DBPROPSET_DATASOURCEINFO)
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PROPERTY_INFO_ENTRY(ACTIVESESSIONS)

‎docs/data/oledb/commands-and-tables.md‎

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- For data sources that support commands, you can use the `CCommand` class instead. To execute a command, call [Open](../../data/oledb/ccommand-open.md) on this class. As an alternative, you can call `Prepare` to prepare a command that you want to execute more than once.
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`CCommand` has three template arguments: an accessor type, a rowset type, and a result type (`CNoMultipleResults`, by default, or `CMultipleResults`). If you specify `CMultipleResults`, the `CCommand` class supports the `IMultipleResults` interface and handles multiple rowsets. The [DBVIEWER](http://msdn.microsoft.com/en-us/07620f99-c347-4d09-9ebc-2459e8049832) sample shows how to handle the multiple results.
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`CCommand` has three template arguments: an accessor type, a rowset type, and a result type (`CNoMultipleResults`, by default, or `CMultipleResults`). If you specify `CMultipleResults`, the `CCommand` class supports the `IMultipleResults` interface and handles multiple rowsets. The [DBVIEWER](http://msdn.microsoft.com/07620f99-c347-4d09-9ebc-2459e8049832) sample shows how to handle the multiple results.
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## See Also
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[OLE DB Consumer Templates](../../data/oledb/ole-db-consumer-templates-cpp.md)

‎docs/data/oledb/consumer-wizard-generated-classes.md‎

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### Column Map
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The wizard then generates the column bindings or column map. To fix several issues with some providers, the following code might bind columns in a different order than that reported by the provider.
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```cpp
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```
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BEGIN_COLUMN_MAP(CProductsAccessor)
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COLUMN_ENTRY_LENGTH_STATUS(1, m_ProductID, m_dwProductIDLength, m_dwProductIDStatus)
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COLUMN_ENTRY_LENGTH_STATUS(2, m_ProductName, m_dwProductNameLength, m_dwProductNameStatus)

‎docs/data/oledb/creating-an-ole-db-provider.md‎

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4. Update the PROVIDER_COLUMN_MAP, which can be found in MyProviderRS.h. For an example, see [Storing Strings In the OLE DB Provider](../../data/oledb/storing-strings-in-the-ole-db-provider.md).
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5. When you are ready to test your provider, you can test it by trying to find the provider in a provider enumeration. For examples of test code that finds a provider in an enumeration, see the [CATDB](http://msdn.microsoft.com/en-us/003d516b-2bf6-444e-8be5-4ebaa0b66046) and [DBVIEWER](http://msdn.microsoft.com/en-us/07620f99-c347-4d09-9ebc-2459e8049832) samples or the example in [Implementing A Simple Consumer](../../data/oledb/implementing-a-simple-consumer.md).
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5. When you are ready to test your provider, you can test it by trying to find the provider in a provider enumeration. For examples of test code that finds a provider in an enumeration, see the [CATDB](http://msdn.microsoft.com/003d516b-2bf6-444e-8be5-4ebaa0b66046) and [DBVIEWER](http://msdn.microsoft.com/07620f99-c347-4d09-9ebc-2459e8049832) samples or the example in [Implementing A Simple Consumer](../../data/oledb/implementing-a-simple-consumer.md).
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6. Add any additional interfaces you want. For an example, see [Enhancing the Simple Read-Only Provider](../../data/oledb/enhancing-the-simple-read-only-provider.md).
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> [!NOTE]
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> By default, the wizards generate code that is OLE DB level 0 compliant. To ensure that your application remains level 0 compliant, do not remove any of the wizard-generated interfaces from the code.
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## See Also
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[CATDB](http://msdn.microsoft.com/en-us/003d516b-2bf6-444e-8be5-4ebaa0b66046)
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[DBVIEWER](http://msdn.microsoft.com/en-us/07620f99-c347-4d09-9ebc-2459e8049832)
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[CATDB](http://msdn.microsoft.com/003d516b-2bf6-444e-8be5-4ebaa0b66046)
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[DBVIEWER](http://msdn.microsoft.com/07620f99-c347-4d09-9ebc-2459e8049832)

‎docs/data/oledb/defining-stored-procedures.md‎

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# Defining Stored Procedures
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Before calling a stored procedure, you must first define it, using the [DEFINE_COMMAND](../../data/oledb/define-command.md) macro. When you define the command, denote parameters with a question mark (?) as the parameter marker:
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```cpp
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```
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DEFINE_COMMAND(CMySProcAccessor, _T("{INSERT {name, phone} into shippers (?,?)}")
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```
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Note that the syntax (the use of braces and so on) used in the code examples in this topic is specific to SQL Server. The syntax that you use in your stored procedures might vary according to the provider you use.
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Next, in the parameter map, specify the parameters that you used in the command, listing the parameters in the order that they occur in the command:
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```cpp
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```
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BEGIN_PARAM_MAP(CMySProcAccessor)
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COLUMN_ENTRY(1, m_Name) // name corresponds to first '?' param
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The previous example defines a stored procedure as it goes. Typically, for efficient reuse of code, a database contains a set of predefined stored procedures with names such as "Sales by Year" or "dt_adduserobject." You can view their definitions using SQL Server Enterprise Manager. You call them as follows (the placement of the '?' parameters depends on the stored procedure's interface):
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```
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DEFINE_COMMAND(CMySProcAccessor, _T("{CALL \"Sales by Year\" (?,?) }")
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DEFINE_COMMAND(CMySProcAccessor, _T("{CALL dbo.dt_adduserobject (?,?) }")
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```

‎docs/data/oledb/determining-which-type-of-accessor-to-use.md‎

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|`CDynamicAccessor`|Automatic.|No.|Useful if you do not know the type of data in a rowset.|
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|`CDynamicParameterAccessor`|Automatic, but can be [overridden](../../data/oledb/overriding-a-dynamic-accessor.md).|Yes, if the provider supports `ICommandWithParameters`. Parameters bound automatically.|Slower than `CDynamicAccessor` but useful for calling generic stored procedures.|
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|`CDynamicStringAccessor[A,W]`|Automatic.|No.|Retrieves data accessed from the data store as string data.|
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|`CManualAccessor`|Manual using `AddBindEntry`.|Manually using `AddParameterEntry`.|Very fast; parameters and columns bound only once. You determine the type of data to use. (See [DBVIEWER](http://msdn.microsoft.com/en-us/07620f99-c347-4d09-9ebc-2459e8049832) sample for an example.) Requires more code than `CDynamicAccessor` or `CAccessor`. It is more like calling OLE DB directly.|
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|`CManualAccessor`|Manual using `AddBindEntry`.|Manually using `AddParameterEntry`.|Very fast; parameters and columns bound only once. You determine the type of data to use. (See [DBVIEWER](http://msdn.microsoft.com/07620f99-c347-4d09-9ebc-2459e8049832) sample for an example.) Requires more code than `CDynamicAccessor` or `CAccessor`. It is more like calling OLE DB directly.|
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|`CXMLAccessor`|Automatic.|No.|Retrieves data accessed from the data store as string data and formats it as XML-tagged data.|
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## See Also

‎docs/data/oledb/obtaining-metadata-with-schema-rowsets.md‎

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For more information about OLE DB schema rowsets, including restriction columns, see [Appendix B: Schema Rowsets](http://go.microsoft.com/fwlink/p/?linkid=64681) in the OLE DB Programmer's Reference.
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For more complex examples of how to use schema rowset classes, see the [CatDB](http://msdn.microsoft.com/en-us/003d516b-2bf6-444e-8be5-4ebaa0b66046) and [DBViewer](http://msdn.microsoft.com/en-us/07620f99-c347-4d09-9ebc-2459e8049832) samples.
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For more complex examples of how to use schema rowset classes, see the [CatDB](http://msdn.microsoft.com/003d516b-2bf6-444e-8be5-4ebaa0b66046) and [DBViewer](http://msdn.microsoft.com/07620f99-c347-4d09-9ebc-2459e8049832) samples.
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For information about provider support for schema rowsets, see [Supporting Schema Rowsets](../../data/oledb/supporting-schema-rowsets.md).
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‎docs/data/oledb/ole-db-consumer-templates-cpp.md‎

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- Native C/C++ data types for OLE DB programming.
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To use the OLE DB Templates, you should be familiar with C++ templates, COM, and the OLE DB interfaces. If you are not familiar with OLE DB, see [OLE DB Programmer's Reference](https://msdn.microsoft.com/en-us/library/ms718124.aspx).
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To use the OLE DB Templates, you should be familiar with C++ templates, COM, and the OLE DB interfaces. If you are not familiar with OLE DB, see [OLE DB Programmer's Reference](https://msdn.microsoft.com/library/ms718124.aspx).
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The OLE DB Templates support the existing OLE DB object model rather than adding a new object model. The top-layer classes in the OLE DB Consumer Templates parallel the components defined in the OLE DB specification. The design of the OLE DB Consumer Templates includes advanced features such as multiple accessors on a rowset. The use of templates and multiple inheritance makes the library small and flexible.
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## See Also
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[OLE DB Programming](../../data/oledb/ole-db-programming.md)
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[Data Access](../data-access-in-cpp.md)
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[OLE DB SDK Documentation](https://msdn.microsoft.com/en-us/library/ms722784.aspx)
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[OLE DB Programmer's Reference](https://msdn.microsoft.com/en-us/library/ms713643.aspx)
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[OLE DB SDK Documentation](https://msdn.microsoft.com/library/ms722784.aspx)
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[OLE DB Programmer's Reference](https://msdn.microsoft.com/library/ms713643.aspx)

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