Where is Implementation for this method

[vinothk khannan]

We all know that ResultSet is an Interface.And for example

ResultSet rs = st.executeQuery(.....);

Now,
We give rs.next();

Where is the implementation for next() method.
We create reference for ResultSet and call the next() method.

Regards,
Vinod

[Mani Ram]

The implementation is provided by the JDBC driver.

[vinothk khannan]

Need Some More Explanation

Or hyper links to explanatory docs

[Jeroen Wenting]

That's all the explanation you should need. Read up on JDBC in your tutorial.

[Mani Ram]

Originally posted by vinothk khannan:
Need Some More Explanation

Or hyper links to explanatory docs

Let me try. If you are using an Oracle driver to connect to Oracle database, the implementation for ResultSet interface is provided by the Oracle driver.

For example, if you look into the ojdbc.jar file, you can find a class called OracleResultSet(*) which implements java.sql.ResultSet.

So, when you say

ResultSet rs = st.executeQuery(.....);

what you get is is an object of type OracleResultSet, which has the implementation for all the methods defined in the java.sql.ResultSet interface.

If you are using someother database, say XYZ, the respective driver also will have a concrete implementation of all necessary interfaces.

Hope that helps.

(*) I'm not sure about the name of the class. I'm just guessing.