Workbook 5 delta

Exercise 7.1: Cascading

Again the oracle database is used, this implies that the data is persisted, it is not necessary to drop the tables after the exercise completes, the tables are re-used in exercise 7.2 and will be removed when undeploying exercies 7.3.



I have added some printing and pauses to enable studying the databse using the object browser.



Exercise 7.2: Inverse relationships

This exercise depends on the tables generated in exercises 7.1

It has to be noted that with oracle / toplink the inverse relationship is only updated via the database when explicitly indicated to do so. Else the cached value will still be used. This can be done by performing a refresh on the entity inside a transaction.

Exercise 7.3: Inverse relationships

Deploying will yield warnings in the server log as the tables alredy exist, these warnings can be ignored. The tables will be removed when undeploying the application.


Back to the index Further to Workbook 6


UUIDs and information about UUIDs
If you have improvements, contact information on the homepage of this host.
The uptime of this host


Search for more information :
Google
`