ocr: dentifying Objects Just like rows in a table need to have unique identifiers called keys, objects need unique identifiers called object IDs (OIDs). A common implementation for OIDs is to use integer numbers. The following chart describes the four basic approaches to assigning OIDs to objects. Strategy implementation Advantages Disadvantages Class-wide All objects of a single Using an integer number Very simple to do. Polymorphism kills this OIDs class are assigned a for the OID, you take the approach aimost instantly. unique OID within the maximum value within the For example, it's possible to ...
