4. System Classes : IntegerHashTable Class : IntegerHashTable Examples
 
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IntegerHashTable Examples
In the following examples, an object of class IntegerHashTable is used to store customer objects based on the customer ID.
Set up the hash table with 100 buckets:
DECLARE
    cust_hash = IntegerHashTable;
ENDDECLARE
{
    cust_hash.Setup(size = 1000);
}
Retrieve customers from the database and insert them into the hash table:
DECLARE
    cust = Customer;
ENDDECLARE
{
    SELECT id AS :cust.id,
        name AS :cust.name,
        title AS :cust.title,
        address AS :cust.address
    FROM customer
    BEGIN
        cust_hash.InsertObject(key= cust.id , object=cust);
        cust = Customer.Create();
END;
    COMMIT;
}
Get customers from the hash table after entering the customer ID into the "id" field within a CompositeField "cust", which is mapped to a Customer object.
ON SETVALUE cust.id =
DECLARE
    cust = Customer DEFAULT NULL;
ENDDECLARE
{
    cust = Customer(cust_hash.Find(key=cust.id));
}
Copy all customer objects from the hash table into an ArrayObject:
DECLARE
    cust_arr = ARRAY OF Customer;
ENDDECLARE
{
    status = cust_hash.FindAll(results=cust_arr);
}
Remove a customer with a specified ID from the hash table:
status = cust_hash.RemoveObject(key=cust.id);
Remove all customer objects from the hash table:
cust_hash.Clear();