How to use a database per customer

Hello,
I currently design an Application that shall be used by multiple customers. Every customer shall have a database by its own for security and performance reasons. What is the best way to do this:
- Create a database schema per customer (no problem)
- Create a persitence unit per customer in peristence.xml (also no problem)
How can I select the correct persistence manager at runtime?
@PersistenceContect(unitName="customer14") EntityManager em;
Selects the Persistence Unit for a bean at compile time. Any idea how I can do this at runtime? I would prefer to keep with container managed Entity Managers, if this is possible.
Thanks in advance for any help.

stelzbock wrote:
Ahh, wow, that was quick!
So all of them have these features I need?
If you mention derby, I just found Java DB which is based on derby. So whats the diference? Can anyone recommend one of them?Check them all. Try which one you like best. I think Java DB is the new name of Derby.
Personally I prefer HSQLDB, but I choose whichever you like.
And what about the Table control? Is JTable feasible? It should be configurable and extendible like this:This is an entirely different question, better asked in the Swing forum.
Also, be careful to separate your DB access from your UI code (google for MVC). It will make your application a lot easier to maintain.

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Can anybody explain with example why and how we use logical database?
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Hello,
SAP comes loaded with all the extras. Among the extras that are most helpful to IT managers are all the access routines needed to pull any business object that managers can think of out of SAP databases. However, SAP has not thought of everything where your particular applications are concerned. SAP organizes its standard database tables to service business units based on conventional business applications. Itu2019s likely your business requires something new, perhaps even something exotic. In that case, you will need to create a new database, using information from different places. Basically, you need a logical database. You need to create a virtual business data object repository consisting of a new kind of record or table that suits your purposes. In addition, the repository should be composed of information that is actually stored in a number of different locations, none of them necessarily logically associated with one another. Letu2019s take a closer look at creating logical databases.
A case for a logical database
Suppose my company manufactures widgets of the most obscure variety, and they are components of other widgets. I sell my widgets as raw material for the more sophisticated widgets built by others, but in some cases I actually partner with other manufacturers in creating yet another class of widget. Now, in my world, I consequently have customers who are also partners. I sell to them and I partner with them in manufacturing and distribution. Also, I need an application that uses both of these dual-use relationships.
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Logical database structures
There are three defining entities in an SAP logical database. You must be clear on all three in order to create and use one.
u2022     Table structure: Your logical database includes data from specified tables in SAP. There is a hierarchy among these tables defined by their foreign keys (all known to SAP), and you are going to define a customized relationship between select tables. This structure is unique and must be defined and saved.
u2022     Data selection: You may not want or need every item in the referenced tables that contributes to your customized database. There is a selection screen that permits you to pick and choose.
u2022     Database access programming: Once youu2019ve defined your logical database, SAP will generate the access subroutines needed to pull the data in the way you want it pulled.
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ABAP/4 (Advanced Business Application Programming language, version 4) is the language created by SAP for implementation and customization of its R/3 system. ABAP/4 comes loaded with many predefined logical databases that can construct and table just about any conventional business objects you might need in any canned SAP application. However, you can also create your own logical databases to construct any custom objects you care to define, as your application requires in ABAP/4. Hereu2019s a step-by-step guide:
1.     Call up transaction SLDB (or transaction SE36). The path you want is Tools | ABAP Workbench | Development | Programming Environment | Logical Databases. This screen is called Logical Database Builder.
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Check the following Document & Links
1. A logical database is in fact
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http://help.sap.com/saphelp_46c/helpdata/en/9f/db9bed35c111d1829f0000e829fbfe/frameset.htm
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i)An easy-to-use standard user interface.
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import java.io.Serializable;
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