alljava because it's have capability work with any data 
base and cliet did not requeried to install any software.

Among jdbc driver TYPE-III driver(or) Net protocol driver is
best. because their is no worry about connection object and
connection pooling,middleware services.THe jdbc connection
are  over all taken by application server.A programer just
use the connection object.
In webapplication TYPE-III driver are mostly used.To work
with TYPE-III driver are in application server

Type 4 Driver will be the best driver.Because the java
application will directly interacts with database without
middlewares. We want a jar file to connect directly(i.e
mysql connector jar file for mysql,ojdbc.jar to pracle
database).

ok , friend see ,there are three drivers and one protocol
which is type-3 ,ok.
My recommendation is  to use type-4 dirver , why , because
it has seveal advantages than the predecessor drivers.
Advantages
----------
->It is directly interacting with database software.
->It does not need much conversions to be included.
->It is compatible with internet program and applet programs
like this many advantages are there list will go on.
ok, now , if you are developing 2-tier project than use
type-4 dirver , if it is web application than use type-3
with type-4 ok
for more information  call 9989683928 , i belong to hyd

Because Type IV driver classes are written purely in
java.and it interacts directly with the database we dont
need to specify any ODBC to interact with the database.

Type-4 driver. i.e,
Oracle JDBC Driver