[jboss-user] [EJB 3.0] - Persistence confusion in EJB 3.0 .........

[sajhak]

hi , 

i m new to EJB development .. the question im going to ask might be a dumb one , if so pls excuse me .... 

the question is .. 
Does entity beans are a replacement for relational databases or it provides a layer on top of the database ?? 
what is actually doing by an Entity Bean ( or persistence object ) ? 
does it saves the entity into a database table or does it keep the information about the entity in the application server's memory ?

because , i tried several examples from several tutorials , but i couldnt find any one of them "writes" the entity into a database .... 

but i think a relational database must involve in this case , cos otherwise it will be impossible for entity be persistent ..

so , how we can define the database that we need to use  ?? ( i need to use a MySQL datastore ) 

if i can get more help (regarding this prob) than this forum please give me the links of such resources .... 

Thanks in advance
Saj



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