IExpressionStore::SaveExpression

Article
06/07/2013

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Use this method to save a new or modified expression to the expression store. For a new expression, the SaveExpression method automatically generates a unique expression ID and stores it with the expression.

Definition

HRESULT IExpressionStore::SaveExpression(_Recordset*pRSExpr);

Parameters

pRSExpr

[in] A pointer to the ADO hierarchical Recordset object that contains the expression.

Return Values

This method returns an HRESULT indicating whether or not it completed successfully. See the Error Values section for more details.

Error Values

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.

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

Constant	Value	Description
E_EXPR_BADCONNECTION	0x8110001F	Invalid connection
E_EXPR_BADEXPRBODY	0x81100004	Invalid or missing expression body
E_EXPR_BADEXPRCATEGORY	0x8110000A	Invalid expression category specified
E_EXPR_BADEXPRNAME	0x81100003	Invalid expression name
E_EXPR_CYCLEDETECTED	0x81100006	A cycle was detected in the expression dependencies of this expression
E_EXPR_DUPEXPRDEPS	0x81100009	Duplicate expression dependency
E_EXPR_DUPEXPRNAME	0x81100007	Duplicate expression name
E_EXPR_DUPPROFDEPS	0x81100008	Duplicate profile dependency
E_EXPR_INVALIDEXPRDEPS	0x8110000B	One or more of the expression dependencies refers to an expression ID that does not exist
E_EXPR_INVALIDFIELDSIZE	0x81100005	The new name exceeds the maximum size of 30 characters
E_EXPR_NOCONNECTIONSTRING	0x8110000D	No connection string specified
E_EXPR_NOPROFDEPS	0x81100002	Expression must have at least one profile-dependency to be saved

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.

Remarks

If the expression being saved is not currently in the expression store, the SaveExpression method generates a unique identifier and populates the ExprID field of the Recordset object. The identifier is a positive integer. For more information about the format and fields of the Recordset object, see Expression Recordset.

The ExpressionStore object performs rudimentary checks for expression dependencies when an expression is saved or deleted. This includes any direct references, a test for cyclic referencing, and any references to non-existent expressions.

Call the Connect method before calling the SaveExpression method.