Tuesday, June 20, 2017

Standard steps for developing JDBC code || Java High Q



Standard steps for developing JDBC code:


         A)    Register JDBC driver s/w with DriverManager
         B)    Establish the connection with Database s/w
         C)    Create JDBC statement obj
         D)    Send and execute SQL query in db s/w
         E)     Get Result from db s/w and process the result
        F)     Close the connection with db s/w

           Example :-



               public static void main(String[] args)throws Exception {
  //register jdbc driver
               Class.forName("oracle.jdbc.driver.OracleDriver");
//Establish the connection Connection          
con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","manager");
//create Statement obj

                 Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
                                                                                                                
                 ResultSet.CONCUR_UPDATABLE);
             
                       //create ResultSet obj
                 ResultSet rs=st.executeQuery("Select sno,sname,sadd from student");
                      //process the ResultSet
                             int cnt=0;
                           while(rs.next()){
                        if(cnt==0)
                     Thread.sleep(20000);
                         rs.refreshRow();
                     System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));
                           cnt++;
                        }

             }








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