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Updating database java

This means it might be more difficult to find a driver for your hardware platform, and it also means you typically can't use the driver from a Java applet.Technically, you can't use the driver from an unsigned applet, but a signed applet might be able to use the driver.

No matter what database you use, there's a good chance that there's already a JDBC driver available for it.

There are four types of JDBC drivers, called Type 1, Type 2, Type 3, and Type 4.

A Type 2 driver accesses a database-specific driver through a native library.

Because it uses a native library, a Type 2 driver is often fairly quick, although there is still some slowdown in the interface between Java and the native API.

Figure 3.3 A Type 3 driver communicates with a database gateway.

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Using a Type 3 driver can be one of the slowest ways to access data because of the presence of the database gateway.

The Java Database Connectivity (JDBC) API is one of the most important APIs for enterprise-level development because you almost always need to access a database.

JDBC gives you a standard API that is mostly database-independent, but still allows you to access specific features of your database if necessary. The core JDBC API () that includes some features more commonly used for J2EE development (especially in the area of Enterprise Java Beans).

Figure 3.2 A Type 2 driver uses a database-specific native library.

A Type 3 JDBC driver is pure Java and uses a database-independent protocol to communicate with a database gateway.

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