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Execute21 Method (RDS)

Executes the request and creates an ADO recordset for use in ADO 2.1.

Important note Important

Beginning with Windows 8 and Windows Server 2012, RDS server components are no longer included in the Windows operating system (see Windows 8 and Windows Server 2012 Compatibility Cookbook for more detail). RDS client components will be removed in a future version of Windows. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Applications that use RDS should migrate to WCF Data Service.


object.Execute21(ConnectionString As String, HandlerString As String, QueryString As String, lMarshalOptions As Long, Properties, TableId, lExecuteOptions As Long, pParameters)

ConnectionString

A string used to connect to the OLE DB provider where the request will be sent for execution. If a handler is specified by using HandlerString, it can edit or replace the connection string.

HandlerString

The string identifies the handler to be used with this execution. The string contains two parts. The first part contains the name (ProgID) of the handler to be used. The second part of the string contains arguments to be passed to the handler. How the arguments string is interpreted is handler specific. The two parts are separated by the first instance of a comma in the string (although the arguments string can contain additional commas). The arguments are optional.

QueryString

A command in the command language supported by the OLE DB provider identified in the connection string. For SQL-based providers, it might contain a Transact-SQL command statement, but for non-SQL providers (for example, MSDataShape) this may not be a Transact-SQL query statement.

Also, if a handler is being used (and it is highly recommended that a handler be used), the handler can alter or replace the value specified here. For example, the handler typically replaces QueryString with a query string from its .ini file. By default, the Msdfmap.ini file is used.

lMarshalOptions

Used to set the marshaling options on the rowset/recordset being returned.

TableID

A variant of type either VT_EMPTY or VT_BSTR. If this value is of type VT_EMPTY, it is ignored. If it is of type VT_BSTR, the recordset is created by using adCmdTableDirect using the value specified here and the QueryString parameter is ignored.

lExecuteOptions

A bitmask of execution options:

1=ReadOnly     The recordset will be opened by using adLockReadOnly.

2=NoBatch     The recordset will be opened by using adLockOptimistic.

4=AllParamInfoSupplied     The caller guarantees that parameter information for all parameters is supplied in pParameters.

8=GetInfo     Parameter information for the query will be obtained from the OLE DB provider and returned in the pParameters parameter. The query is not executed and no recordset is returned.

16=GetHiddenColumns     The recordset will be opened by using adLockBatchOptimistic and any hidden columns will be included in the recordset.

Although ReadOnly, NoBatch and GetHiddenColumns are mutually exclusive options, it is not an error to set more than one of them. If multiple options are set, GetHiddenColumns takes precedence over all other options, followed by ReadOnly. If no options are specified, by default, the recordset is opened by using adLockBatchOptimistic but hidden columns are not included in the recordset.

pParameters

A variant that contains a safe array of parameter definitions. If the GetInfo option was specified in lExecuteOptions, this parameter is used to return the parameter definitions obtained from the OLE DB provider. Otherwise, this parameter may be empty.

The HandlerString parameter may be null. What occurs in this case depends on how the RDS server is configured. A handler string of "MSDFMAP.handler" indicates that the Microsoft supplied handler (Msdfmap.dll) should be used. A handler string of "MASDFMAP.handler,sample.ini" indicates that the Msdfmap.dll handler should be used and that the argument "sample.ini" should be passed to the handler. MSDFMAP.dll will interpret the argument as a direction to use the sample.ini to check the connection and query strings.

Note Note

The Execute21 method is a version of the Execute method (RDS). Where you need to use the Execute method to communicate with ADO 2.1, the Execute21 method can be called instead. The capabilities of the Execute method in ADO 2.5 and later are a superset of the capabilities provided for the same method in ADO 2.1.

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