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Informix allows you to specify that a trigger should operate at three distinct times during the processing of a triggered change to the target table: BEFORE The trigger fires before any changes take place. No rows of the target table have yet been modified. AFTER The trigger fires after all changes take place. All affected rows of the target table have been modified. FOR EACH ROW The trigger fires repeatedly, once as each row affected by the change is being modified. Both the old and new data values for the row are available to the trigger. An individual trigger definition can specify actions to be taken at one or more of these steps. For example, a trigger could execute a stored procedure to calculate the sum of all orders BEFORE an update, monitor updates to each ORDERS row as they occur with a second action, and then calculate the revised order total AFTER the update with a call to another stored procedure. Here is a trigger definition that does all of this:

EJB 2.0 represents a major revision to the EJB specification. Many of the enhancements in EJB 2.0 were incompatible with the corresponding capabilities in EJB 1.x. To avoid breaking EJB 1.x-compatible beans, EJB 2.0 provides complementary capabilities in these areas, allowing side-by-side coexistence of EJB 1.x and EJB 2.0 beans. A complete description of the differences between EJB 1.x and EJB 2.0 is well beyond the scope of this book. However, several of the differences were motivated by difficulties in using container-managed persistence under the EJB 1.x specification, and those changes directly affect database processing within EJBs. One difficulty with EJB 1.x has already been mentioned the difficulty of modeling complex objects that draw their data from multiple database tables or that contain nonrelational structures like arrays and hierarchical data. With EJB 1.x, you could model a complex object as a family of inter-related entity beans, each drawn from one table. This approach allowed the use of container-managed persistence, but the relationships between pieces of the object need to be implemented in applications code within the bean. Ideally, these internal details within the complex object should be hidden from applications code. Alternatively, with EJB 1.x, you could model a complex object as a single entity bean, with data in the bean s instance variables drawn from multiple related tables. This achieves the desired application code transparency, but

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create trigger upd_ord update of amount on orders referencing old as pre new as post /* Calculate order total before changes */ before (execute procedure add_orders() into old_total;) /* Capture order increases and decreases */ for each row when (post.amount < pre.amount) /* Write decrease data into table */ (insert into ord_less values (pre.cust, pre.order_date, pre.amount, post.amount);) when (post.amount > pre.amount) /* Write increase data into table */ (insert into ord_more values (pre.cust, pre.order_date, pre.amount, post.amount);) /* After changes, recalculate total */ after (execute procedure add_orders() into new_total;)

container-managed persistence could be used when an entity bean draws its data from multiple tables EJB 20 addresses this issue through the use of abstract accessor methods, which are used to set and retrieve every persistent instance variable within an entity bean The container actually maintains the storage for the variables and the variable values The bean explicitly calls a get() accessor method to retrieve an instance variable value and a set() accessor method to set its value Similarly, there are get() and set() abstract accessor methods for every relationship that links the rows in the database that contribute data to the entity bean Many-to-many relationships are easily handled by mapping them into Java collection variables With these new features, the container has complete knowledge of all the instance variables used by a bean, and every access that code within the bean makes to the instance variables.

The BEFORE clause in this trigger specifies that a stored procedure named ADD_ORDERS is to be called before any UPDATE statement processing occurs. Presumably, this procedure calculates the total orders and returns the total value into the local variable OLD_TOTAL. Similarly, the AFTER clause specifies that a stored procedure (in this case, the same one) is to be called after all UPDATE statement processing is complete. This time, the total orders amount is placed into a different local variable, NEW_TOTAL.

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The entity bean can represent a complex object that draws data from multiple database tables, hiding the details from the applications code But container-managed persistence can now be used, because the container knows all about the various parts of the object and the relationships among the parts Another problem with the EJB 1x specification is that while database interactions were standardized, the finder methods that are used to search the active entity beans were not The finder methods implement capabilities like searching for a particular entity bean by primary key, or searching for the set of beans that match a particular criterion Without this standardization, portability across application servers was compromised, and searches of entity beans often required recourse to searching the underlying database EJB 20 addresses the searching limitations through the use of abstract select methods that search entity beans.

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