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Late binding waits until runtime to look for the COM object. Most of the time, you use early binding, but occasionally you might need to use late binding to reference a COM component. This might be the case if you don t have access to the type library during development. Or you may need to programmatically determine the ProgID or CLSID of the COM object at runtime based on some variables. To late-bind a COM object, you follow these steps: 1. Retrieve the Type for the object. 2. Create an instance of the object. 3. Call the methods. The syntax used to accomplish late binding varies between the languages. Visual Basic .NET (VB.NET) supports a streamlined syntax to use late binding, so we ll consider it first. Here is the sample VB.NET code: 'Retrieve the Type for the COM object Dim comType As Type comType = Type.GetTypeFromProgID( _ "DniComRefactorVB.DniComRefactorVBObj") 'create an instance of the COM object Dim comObj As Object 'dim for late-binding comObj = Activator.CreateInstance(comType) Dim acctId As Integer Dim pastDueAmt As Decimal 'execute the first COM method acctId = comObj.SearchForAccount("accountKey") If acctId > 0 Then 'the second COM method pastDueAmt = comObj.GetPastDueBalance(acctId) If pastDueAmt > 100 Then 'the third COM method comObj.SetAccountDelinquent(acctId) End If End If Console.WriteLine("Acct Id:{0}, PastDueAmt:{1}", _ acctId, pastDueAmt) 'wait for input Console.WriteLine("Press any key to exit") Console.Read() This example calls the same COM object we used in the last recipe. The first step is to retrieve the Type for the COM object. To do this, we can use either the static GetTypeFromProgID or GetTypeFromCLSID method of the Type class. We choose to use GetTypeFromProgID, specifying the full ProgID for the COM component. The ProgID can specify either a version-independent name or one that identifies a specific version of the component.

Take a look at this example of a lookup relationship, inherited by converting a very poorly designed Access camping goods application to Firebird. Access client applications can do cute things with entire tables that allow amateurs to build RAD applications. This table was used in a visual control that could display a table and transplant a value into another table at the click of a button.

array(2) { [0]=> string(6) "orange" [1]=> string(5) "apple" } PHP implements a few so-called magic constants. These are not really constants, because they change value depending on where they are used (see Table 10-10). Table 10-10. Magic Constants

CREATE TABLE COLORS (COLOR CHARACTER(20) NOT NULL PRIMARY KEY);

Here is a DDL fragment from one of the tables that used COLORS for a lookup:

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CREATE TABLE STOCK_ITEM ( ... COLOR CHARACTER(20) DEFAULT 'NEUTRAL', ..., CONSTRAINT FK_COLOR FOREIGN KEY (COLOR) REFERENCES COLORS(COLOR) ON UPDATE CASCADE ON DELETE SET DEFAULT;

If we wanted to specify a Guid instead, we could have used the GetTypeFromCLSID method: comType = Type.GetTypeFromCLSID( _ New Guid("{6E6F51E4-7387-4C07-970D-AD452DC6971D}")) In either case, the Type object returned would be the same. Remember that if you are referencing a VB6 component, the Guid may change from build to build. For that reason, it s easier to use the ProgID.

__FILE__ __LINE__ __FUNCTION__ __CLASS__ __METHOD__

There were a lot of problems with this key. First, the COLORS table was available to the inventory buyers to edit as they saw fit. Updates cascaded all over the system whenever new items came into stock. Deletions frequently stripped the color information from the relatively few items where it mattered. Worst of all, the bulk of items in this system were one color, 'NEUTRAL', with the result that the foreign key s index was a real showstopper on inventory queries. The relational way to avoid the unplanned breakage of consistency would have been to use a lookup key with no meaning as data (i.e., an atomic key):

CREATE TABLE COLORS ( ID INTEGER NOT NULL PRIMARY KEY, /* or UNIQUE */ COLOR CHARACTER(20)); COMMIT; INSERT INTO COLORS (ID, COLOR) VALUES (0, 'NEUTRAL'); COMMIT; CREATE TABLE STOCK_ITEM ( ... COLOR INTEGER DEFAULT 0, ...);

Such a key need never change and it can (and should) be hidden from users entirely. Tables that use the lookup table store the stable key. Changes in available values are implemented as new lookup rows with new keys. Values already associated with keys do not change they are preserved to ensure that history data is not compromised by subsequent changes. In the event that, even with the higher distribution of key values, the foreign key would produce an index that was still poorly selective over a large table, the improve-

Note If you are not sure what the full ProgID or CLSID is for a component, you can find this information

17

Name of current file Current line number Name of current function Name of current class Name of current method

ment to the stability of the table justifies avoiding a formal referential constraint. Existence of the referenced primary row can be easily enforced using custom triggers.

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