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JDBC drivers fit into one of four categories:
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1.The JDBC-ODBC bridge provides JDBC access via mostly ODBC drivers.
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2.A native-API partly-Java driver converts JDBC calls into calls to the client API for Oracle, Sybase, Informix, DB2, or other DBMS.
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( E.g. WebLogic Oracle driver)
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3.A net-protocol all-Java driver translates JDBC calls into a DBMS-independent net protocol which is then translated to a DBMS protocol by a server. This net server middleware is able to connect all its Java clients to many different databases.
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4.A native-protocol all-Java driver converts JDBC calls into the network protcol used by DBMSs directly. This allows a direct call from the client machine to the DBMS server and is a practical solution for Intranet access. (also WebLogic)
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