Can any one tell whether the concept which i understood is correct or not

Question

hai everyone
iam studying jdbc and this is what i understood about the basic concept .can any one tell whether the concept which i understood is correct or not
whenever the statement class.forName("driver class") is executed driver class is loaded and registered with drivermanager.Internally drivr class contains a static bloc which contains the following code
static
Driver drv=new name of driver class();
DriverManager.registerDriver(drv);
whenever the statement class.forName("driver class") is executed,static bloc is executed first and driver class is registerd.
concept as i understood about DriverManager:
suppose there may be situations where an application developed in java has to deal with one or several databases and this is accomplished with one or different driver classes.so all these driver classes are to be managed and this is done by DriverManager class and in order to make the driver class itself known to the driver manager we have to register the driver classes with the help of registerDriver() method of DriverManager class because DriverManager is the class which will attempt to load the driver classes into memory..
If we look at the last statement: DriverManager is the class which will attempt to load the driver classes into memory.Here i have some doubt if DriverManager class loads the driver class after registering the driver class then what does the statement class.forName("driver class") will do which is also used to loaad the driver class.
what i understood is since the responsibility of loading the class is done by class.forName("driver class") only registering of the driver class is done as the class is alredy loaded.
help me to clear my confusion
thanks in advance

Answer 1

hai everyone
iam studying jdbc and this is what i understood about
the basic concept .can any one tell whether the
concept which i understood is correct or not
whenever the statement class.forName("driver class")
is executed driver class is loaded and registered
with drivermanager.Internally drivr class contains a
static bloc which contains the following code
static
Driver drv=new name of driver class();
DriverManager.registerDriver(drv);
}That's supposed to be the case, but there's no way to guarantee that every driver actually has that static init. I don't think I've ever run across one that doesn't, though, so, yes, you're basically correct.
whenever the statement class.forName("driver class")
is executed,static bloc is executed first and driver
class is registerd.When you do Class.forName(), the class is loaded and initialized. Whenever you initialize a class, its static init blocks are executed, yes.
concept as i understood about
DriverManager:
suppose there may be situations where an application
developed in java has to deal with one or several
databases and this is accomplished with one or
different driver classes.so all these driver classes
are to be managed and this is done by DriverManager
class and in order to make the driver class itself
known to the driver manager we have to register the
driver classes with the help of registerDriver()
method of DriverManager class because
DriverManager is the class which will attempt
to load the driver classes into memory..Except for that last part, yes.
DM keeps track of loaded drivers, and gives them a chance to parse the connection URL when you call getConnection. DM does NOT load the driver classes into memory, however. That's done when you call Class.forName.
what i understood is since the responsibility of
loading the class is done by class.forName("driver
class") only registering of the driver class is done
as the class is alredy loaded.Right.