The Java folks have defined four methods for achieving Java Database Connectivity. Type 1, always meant to be temporary, uses a bridge driver to access existing ODBC drivers. Using several DBMSes involves loading the ODBC driver for each. Type 4 is native Java that translates the JDBC call to the DBMS API and will thus be different for each DBMS. Most programmers will want Types 2 and 3, which call a middleware layer. Type 2 is part Java, part native API. Type 3 is pure Java. For more information:
http://java.sun.com/products/jdbc/jdbc.drivers.html
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Flexible C++
Matthew Wilson
My approach to software engineering is far more pragmatic than it
is
theoretical--and no language better exemplifies this than C++.
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JDBC Access Types
