JDBC

A truly useful servlet application is to add database connectivity. Adding a database to a servlet is no different from adding a database to an applet or application. Servlets basically can access variety of data sources such as relational databases, directory servers , proprietary file formats ,XML formats etc. We can use any sort of database connectivity provided JDBC connectivity is done through appropriate JDBC driver.An embedded engine is generally a light weight server deployment platform that can be embedded in another application. Some of the famous webservers are Java server, Jef PosKanzer's Acme server, and Paralogic's webcore.Webserver is a program running on the server that listens for incoming requests and services those requests as they come in depending up on the type of request. It might search for the requested page or at times execute a program on the server architecture.

JDBC driver

JDBC driver is what the JVM uses to translate the generalized JDBC calls in to Vendor-specific database calls that the database will understand. These drivers are java classes that are loaded at runtime. Java soft has classified drivers into four types which deployed appropriately works will all types databases. They are

Java Programming ServicesJDBC-ODBC bridge/Type 1 driver

This tier translates standard JDBC calls to corresponding ODBC call and sends it to an ODBC data source through the operating system's ODBC libraries where the request is processed and the results are send back

Java Programming ServicesNative-API partly Java driver/Type 2 driver

This driver is similar to Type1 except Translation layer. when a database call is made using JDBC the driver will translate the code into something that vendor API will understand .the database then processes and sends back the results through API.

Java Programming ServicesJDBC-Net pure Java driver/ Type3 driver

Uses java driver and all java middle tier to provide data access to your programs. A JDBC call is send to middle tier without translation through JDBC driver then middle tier uses Type 1 or Type 2 driver to talk to the database.

Java Programming ServicesNative-Protocol pure Java driver/Type 4 driver

Type 4 driver is an alljava driver that issues requests directly to the database. This is considered to be the most efficient method of accessing your database.

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