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Working with multiple databases which are present in remote locations.

 
Samir Dasgupta
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We are developing an application where we have to interact with three databases present in three different physical machines.

Database1:
10.123.345.321(IP) - MYSQL

Database2:
34.45.75.32(IP) - SQL Server 2000

Database3:
98.43.56.75(IP) - Oracle 10g

We need to work with the tables present in all these three database. My Question is how can I implement this in JAVA with:
1) JDBC
2) ORM Tools(JPA, Hibernate etc).

Also I was browsing through different sites and I came across the term Database Link. Although I couldn't understand what it is and whether it is relevant to my problem statement.

Thanks,
Samir
 
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