Code For Type 4 Driver In Java
You are using the jdbc interface from java.sql classes, so the type of driver will not have any logic impact in your code, it will only have runtime / deployment impact. You are also using the ojdb14.jar from Oracle, probably with a 'thin' jdbc configuration, which means you are using a type-4 driver configuration. With such a configuration, you will only need to deploy the JDBC jar file with your database accessing program. The other options include a JDBC bridge, which really means an ODBC connection wrapped in JDBC clothing. This means you would have to configure your system for correct ODBC function, and then use a JAR file to access ODBC. Due to the extra 'hop' of data through ODBC, one would expect it to be a bit slower than a type-4 access; however, there is a possibility that the ODBC is optimized to such a great extent for a particular situation, that the extra hop is negligible. As with most performance concerns, the truth is discovered by testing (in your environment).
The type-2 drivers again use a Java (JDBC) API; however, they bridge the calls into a C or C style shared library, which then handles the real connection. If the driver is optimized to be so fast that the JNI setup / tear down calls are negligible in cost, then perhaps it might outperform type-4 drivers. Type 3 drivers basically proxy (or relay) the request to another network resource.
Using the Oracle Type 4 JDBC drivers with the Java Security Manager enabled requires. The application and driver code bases must be granted security. What is type 1,2,3 or 4 of a JDBC Driver? So the type of driver will not have any logic impact in your code. Type 4: All Java/Native-protocol driver.
That typically incurs an extra network hit, but again, that doesn't say much about actual performance. Type 4 drivers are the ones you probably want to stick with.
The Java program connects directly to the database, meaning that if there is a problem, it will be captured entirely within the JVM of the program making the connection (type 1, it's in the ODBC layer, type 2 it's in the native compiled code, type 3 it's in the remote network proxy). Again none of this has to do with functionality; however, they all impact how to deploy, how to debug, and how to configure the database connection. +-+-+-+ Type Driver Descripiton +-+-+-+ 1 JDBC-ODBC Bridge (bridge) Translates all JDBC calls into ODBC calls. 2 Native API (native) Translates all JDBC calls into native API database calls. (e.g: DLL on windows using JNI) 3 Network Protocol(middleware) Translates all JDBC calls into database independent middleware specific calls. 4 Native Protocol(pure java thin) Translates all JDBC calls directly into database calls. +-+-+-+.
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If I understood correctly, this error message is a compiler error message. It means that your code is in the default package, and you have a class in this default package which is named Connection. DriverManager.getConnection(.) returns a java.sql.Connection. Use java.sql.Connection con = DriverManager.getConnection(.) or rename your own Connection class to something else. And don't ever use the default package. It leads to all sorts of problems and should be avoided. Always put your classes in a package of yours.
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According to the MySQL 5.0 Reference Manual, the MySQL JDCB Connector/J is a 'Type 4' driver. The method I'm using to connect to the JDBC server is.