java ResultSet code example

Example 1: result set in jdbc

Connection = 
  Helps our java project connect to database
Statement = 
  Helps to write and execute SQL query
ResultSet = 
  A DataStructure where the data from query result stored
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    

  After succesfully created the connect
next step is STATEMENT

Statement statement = connection.createStatement();
We use createStatement() method to create
the statement from our connection.
-The result we get from this type of statement
can only move from top to bottom,
not other way around

Statement statement = connection.
createStatement(ResultSet TYPE_SCROLL_INSENSITIVE
,ResultSet CONCUR_READ_ONLY);

-The result we get from this type of
statement can freely move between rows

Once we have statement we can run
the query and get the result to
ResultSet format 
		import java.sql.ResultSet;
        
We use the method executeQuery()
to execute our queries

ResultSet result = statement.
              executeQuery("Select * from employees");

Example 2: resultset methods in jdbc

next() -> moves to next row
previous() -> moves to previous row
getObject() -> reads data from column
first() -> jumps to first row
last() -> jumps to last row
absolute(int row) -> go to specific row
beforeFirst()-> jumps to row 0. 
            Used to call next() method in while loop
getRow() -> returns index of current row