IExpressionStore::Connect
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Use this method to store the connection string to an expression store.
Definition
HRESULT IExpressionStore::Connect(BSTRstrConnStr);
Parameters
strConnStr
[in] A BSTR that contains the database connection information for the expression store.
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_BADEXPRSTORE | 0x8110001E | Specified database does not contain a valid expression store |
| E_EXPR_NOCONNECTIONSTRING | 0x8110000D | No connection string specified |
| E_EXPR_STOREPERMISSIONS | 0x8110000F | Insufficient access permissions on the expression store database |
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
The ExpressionStore object does not maintain a persistent ADO connection. This method stores the connection string after validating that the connection string points to an actual expression store. The Disconnect method sets the connection string to an empty string.
Each method of the ExpressionStore object creates a connection when needed, and when done with it, closes the connection. This relies on ADO connection pooling and provides higher availability.
The connection string for the expression store may be obtained through the SiteConfigReadOnly object or through the Commerce Server Manager console from the s_BizDataStoreConnectionString property under the key "Commerce Server Manager\Global Resources\Profiles".
The Connect method must be successfully executed before calling any other method of an externally created ExpressionStore object.
For more information about memory ownership issues related to COM property and method parameters, see Managing COM Parameter Memory.