Creating Models › Creating a Physical Model › Triggers › Methods to Override Trigger Templates › Table Override Templates

Table Override Templates

To enforce specific business rules for individual tables, you can use a table override template to change the way a built-in trigger behaves for an individual table. For example, suppose that each time an ordered line item is inserted into the ORDER_LINE table, you want to add the order_quantity amount from the ORDER_LINE table to the product_sold_quantity in the PRODUCT table. One way to achieve the behavior is to create a table override trigger for the ORDER_LINE table that performs the additional task.

When you create custom table triggers and attach them to tables, you override the standard erwin® Data Modeler scheme, which combines the different built-in templates. By default, when a new table level template is created, template code is inserted that produces the standard built-in trigger. Usually, you can leave the built-in trigger code as is, and insert the additional code necessary for the custom business rule after the section.