Hello I am trying to build an application using Oracle ADF.
I have designed my database using Oracle Workbench have all the tables in the database already linked.( be it one to many or one to one mapping with the primary and foreignm keys.) i hope to include triggers too.
My problem is when i do all these links in workbench.
Will it automatically link the tables up using Association when i I load the tables as entities.
Will it also create views and view links too for me.
Or i should just create the tables in the database and do the associations and links in jdeveloper instead when i start working on the UI of my project.
If you use New - Business Tier - ADF Business Components - Business Components from Tables and go through the wizard pointint your tables in the database, JDeveloper should create Entities, link them with Associations, also create View Objects and link them with View Links based on your tables' foreign keys.
Triggers won't be reflected in the application.
Related
I've been trying for days but cannot find the answer to this. I am using Oracle Application Express (APEX), someone else setup the initial connection to a "Apex" database in oracle, but I am trying to connect to our production database in oracle. I am making web forms and the web forms are connected to the "Apex" database that was setup already, but I need to connect to our production database so we can create reports from the data entered through the web forms. I need the tables to show up in the create page option from the production database, currently its coming from the apex database, please help.
Create Page View with Tables (from apex)
Thank You so much in Advance!
What is the "production database"? Is it really a different database (than the one you're currently connected to), or is it a user in the same database?
if former:
you could create a database link between those two databases and create synonyms for production users' tables in one of schemas your workspace is assigned to.
another option is to install Apex onto the production database, so that you could use current installation as "development" and then deploy the application into the "production-based" Apex
if latter, you might do the same (i.e. create synonyms, just without the database link), or simply assign the production schema to your workspace
You may be interested to read Mike's response to a question with a similar misunderstanding regarding architecture.
https://community.oracle.com/thread/4135843
Once you have your head wrapped around this, you can consider the parsing schema to your application. This schema defines the table access your application has, in the normal way Oracle handles table privileges.
Then it's up to you to define who has access to what pages, using APEX Authorisation Schemes.
The database I am using is Oracle 11g Express Edition release 2.
I created 2 schemas in the same instance xe. They all have the same tables names and sequences names and stored procedures and stored functions and views names. But the tables structures and views texts are different ( there is some modifications between them ).
The reason for the creation of these two schemas is because our project has two versions. So the first schema is used for the first version , and the second schema was created for the second version. The mechanism of our web application Spring project is that whenever a connection is made through the web application login page then a corresponding Oracle user is making a connection according to the login entered ; so there is no fixed credential connection , there are Oracle users corresponding to each web application login.
So in order for each user to work with each database objects then I created public synonyms for every objects , and granted permissions to them for each user. But the database objects are owned by the schema I mentioned at the beginning. Now my problem is this : our customer wants the two project versions to be run on a same instance ( same computer server ). So one of the project version cannot run because the public synonyms can only refer to a particular schema owner. So how to make the public synonyms work for each schema ?
In short, you can't. However, you can always use a distinct synonym name to identify the object.
Something similar to below:
create public synonym structures_v1 for schema1.structures;
create public synonym structures_v2 for schema2.structures;
Oracle provides 2 totally different technologies for this situation (which comes to my mind):
Editions (and Edition Based Redefinition)
PDBs
With Editions you can create the same Object once in each Edition - but there are limitations like tables are not editionable.
It's not a feature you just enable, you need to understand the concept and implement it properly.
PDBs enable consolidation of Databases with colliding namespace (such as your described synonyms) within the same CDB and therefore save SGA/memory. Basically they are totally separated - limited interference can be implemented when it's concept of object & data inheritance is understand.
What about creating a 3rd Schema and having Synonym and permission to query 1st and 2nd schema. Anyone tested this concept?
I have an ERP application running with Oracle forms and Oracle database. Now I am planning to migrate this application to a java based enterprise application. will it be a good idea to keep the existing oracle database as back end and developing a web application with certain level of changes/additions in the DB design.
There are two facts to know before answer your questions:
has your database schema some oracle forms special structures or is it in 3rd normal form and simply stores data using keys and enforced referential integrity?
How much stored code contains your database?
Ad 1. Oracle forms don't have specific schema reqiurements. They work best if your schema if based on 3rd normal form. If your schema is like this, use it for new Java application. We have both forms and Java EE applications on same database schemas and is works fine.
Advantage is, if you have keys (primary, unique, foreign) in your schema. Use them when generating Java app.
Probably you will have to add #Version columns for optimistic locking (see https://docs.oracle.com/javaee/6/api/javax/persistence/Version.html). But there is not reason to build new schema for it.
Ad 2. Your will have to overwrite bigger part of database stored code (triggers, procedures, functions) to Java. In most cases this does not have dramatic impact to schema structure, but deal with it.
So - if your database schema is not tailored to some UI client needs AND you want only use a new client, use your schema. If not, create a new one.
We are using a SaaS provider at my company, who also offers direct read-only access to their back end Oracle database.
Our Oracle user does not own any of the tables, therefore the tables we want to read belong to other users. So the tables must be addressed as follows: OwnerUser.table1, OwnerUser.table2, etc.
When setting up a data source in LightSwitch, no tables are visible, because the Entity Data Model is mapping to tables owned by our user (the one which we connect with).
Does anyone know if I can tweak the data source somewhere to inject the owner prefix (e.g. OwnerUser) so that the LightSwitch Designer will show the tables owned by OwnerUser?
You might find that in this case it might be easier to create a custom RIA Service layer for the datasource that passes the user information and sets up the tables.
Is there a way to make Entity Framework 4.1 Code First NOT to drop database or the tables, not even if its changed? Im suppose to upgrade a LIVE site and I cant because of this. I seen some NuGet classes I can get but its to not drop database but tables, recreate tables on change ect.. i just do not want to do anything to the database or the tables.
In the startup of your application add this:
Database.SetInitializer<YourContextType>(null);
This should remove any initialization strategy.