Joining tables in two mysql databases on different machines using JDBC or hibernate

Hi Experts,
We have two database on different machines, how we can join tables of different database(on different machine) in mysql using jdbc or hibernate
1) I have two database servers i.e serverA and serverB
2) ServerA we have table productInfo
3) ServerB has order table
4) I need to join this two tables(i.e productInfo and order table) in mysql using jdbc or hibernate
5) Please provide standard solution
6) and also provide cons and pros

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Is the database user common across the two databases?
Kanti PrasadCommented:

The use should have access to both the DBs and tables.

FROM ServerB_DatabaseName.order
JOIN ServerA_DatabaseName.productInfo
     ON (ServerB_DatabaseName.order.your_order_field_ID = ServerA_DatabaseName.productInfo.your_productInfo_field_ID)
WHERE ServerA_DatabaseName.productInfo.columnIF = 100
Unless you have done something special to link the two servers (e.g. mounting the shared tables as network drives) I don't think you can do the join in the database.

Instead, you'd need to retrieve the data and do the join using code.

E.g. To join a specific order to product info, first retrieve the order, then find the product info id in the order and issue a second query to load that product info.  Then combine the two rows of data (again in code) and return that.

That's at least the JDBC approach.  No idea how Hibernate would do it.


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