The JDBC-Net drivers are a three-tier solution. This type of driver translates JDBC calls into a database independent network protocol that is sent to a middleware server. This server then translates this DBMS independent protocol into a DBMS-specific protocol, which is sent to a particular database. The results are then routed back through the middleware server and sent back to the client. This type of solution makes it possible to implement a pure Java client. It also makes it possible to swap databases without affecting the client.
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