IExpressionStore::GetExpression Method [C++]

Use this method to retrieve an ADO hierarchical Recordset object that contains the specified expression.

Definition

[C++]

HRESULT IExpressionStore::GetExpression(longnExprID,
 _Recordset**ppRSExpr);

[Visual Basic]

Function GetExpression(nExprID As Long) As Object

Parameters

  • nExprID[C++]
    [in] A long that contains the unique identifier of the expression.
  • nExprID[Visual Basic]
    [in] A Long that contains the unique identifier of the expression.
  • ppRSExpr[C++]
    [out, retval] An address of a pointer to an ADO hierarchical Recordset object that contains the expression.

Return Values

[C++] This method returns an HRESULT indicating whether it completed successfully. See the Error Values section for more details. If the method does not complete successfully, the address of the pointer to the Recordset object is set to NULL.

[Visual Basic] This method returns an ADO hierarchical Recordset object. If successful, the Recordset object contains the specified expression. If unsuccessful, the Recordset object is set to Nothing.

Error Values

[C++] This method returns S_OK (0x00000000) to indicate success and either standard or custom COM HRESULT error values to indicate failure. For more information about standard COM errors, see Standard COM Errors.

[Visual Basic] This method sets the Number property of the global Err object to S_OK (&H00000000) to indicate success and to either standard or custom COM error values to indicate failure. For more information about standard COM errors, see Standard COM Errors.

The following table shows the custom COM errors that this method can return.

Constant Value Description
E_EXPR_BADCONNECTION

[C++] 0x8110001F

[Visual Basic] &H8110001F

Invalid connection
E_EXPR_BADEXPRID

[C++] 0x8110000A

[Visual Basic] &H8110000A

Invalid expression ID specified, or expression ID not found in store
E_EXPR_NOCONNECTIONSTRING

[C++] 0x8110000D

[Visual Basic] &H8110000D

No connection string specified

[C++] Additional information may be available using the global Err object, which can be accessed using the API function GetErrorInfo. In particular, the GetDescription method of the IErrorInfo interface may return a text description of the error.

[Visual Basic] Additional information may be available using the global Err object. In particular, the Description property may contain a text description of the error.

Remarks

To access all expressions in the connected expression store, use the GetAllExprs method.

Call the Connect method before calling the GetExpression method.

For more information about memory ownership issues related to COM property and method parameters, see Managing COM Parameter Memory.

[C++]

The ppRSExps parameter contains valid data only if the method completes successfully.

See Also

[C++]Expression Recordset

[C++]ExpressionStore Object

[C++]IExpressionStore::Connect

[C++]IExpressionStore::GetAllExprs

[C++]IExpressionStore::NewExpression

[Visual Basic]Expression Recordset

[Visual Basic]ExpressionStore Object

[Visual Basic]ExpressionStore.Connect

[Visual Basic]ExpressionStore.GetAllExprs

[Visual Basic]ExpressionStore.NewExpression

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