package javatemplate1;

import java.sql.*;

import java.sql.ResultSet; // for result set
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

public class JavaTemplate1 {
    // example of 
       public static void main(String[] args) {
        // TODO code application logic here
        System.out.println("main block executing ");
       Connection c = null; //manage copnnection
       Statement st = null;// query statement support
       ResultSet rs = null;// active connection database result
     // String dbURL = "jdbc:postgresql://localhost:5432/pgsdemo1";
    //String user = "postgres"; String pwd = "postgre_manas9";
     String dbURL = "jdbc:mysql://localhost/test?"; 
     String user = "Manas9"; String pwd = "Manas9237";
     String sql1 = "create table visitor1(" + "id int,"  + "fname varchar(30)," + "lname varchar(30),"    + "age  int(2))";
     String sql2= "drop table if exists visitor1;";
      String sql3 ="Select * from visitor1";
     //create table visitor1 ("id int,"  + "fname varchar(30)," + "lname varchar(30),"    + "age  int(2))";
     String str1 ="INSERT INTO  visitor1 values(101,'John', 'Doe', 40)";
     String str2 ="INSERT INTO  visitor1 values (102,'Peter', 'Pan', 44)"; 
      // connecting to db
      try {
          // Connection>>statement >> Resultset >>
           // connection>>statement >> Resultset 
       c = DriverManager.getConnection(dbURL,user,pwd);
       // drop table if exists visitor1;
       st = c.createStatement();
       st.execute(sql2);
      //create table visitor1(
       st = c.createStatement();
       st.execute(sql1);
       //INSERT INTO  visitor1 values
       st = c.createStatement();
       st.execute(str1);
       st = c.createStatement();
       st.execute(str2);
      //Select * from visitor1
       st = c.createStatement();
       rs = st.executeQuery(sql3);
       ResultSetMetaData metaData = rs.getMetaData();
       int numberOfColumns = metaData.getColumnCount();  
       //int rownum = metaData.
// get name of the columuns 
         for ( int i = 1; i <= numberOfColumns; i++ )
         System.out.printf( "%-4s\t", 
                 metaData.getColumnName( i ) );
         System.out.println();
        //
      Process.loaddata(rs, numberOfColumns);
      
      } catch (SQLException ex) { ex.getErrorCode();
            String message = ex.getMessage();  
            System.out.println(message); 
      } finally {
          System.out.println("going through final block"); 
            try {
                 if (st== null || st.isClosed()) {
                } else {
                  st.close();
              }
                if (c != null && !c.isClosed()) {
                    c.close(); }
            } catch (SQLException ex) { ex.getErrorCode();
                  ex.getMessage();              
            }
        }
      
      System.out.println("dis-Connected to  database successfully"); 
    } 
      
}
class Process {
       //
 public static void loaddata(ResultSet x1 , int n2)
        throws SQLException
{ int size = 0; 
    while ( x1.next() ) 
         {
             size++; 
            for ( int i = 1; i <= n2; i++ )
                try {
          System.out.printf( "%-4s\t", x1.getObject( i ));
          } catch (SQLException ex) {
            Logger.getLogger(Process.class.getName()).
             log(Level.SEVERE, null, ex);
                }
            System.out.println();
         }
    //displayMap(list1); 
    System.out.println("processed rows :: "+ size);
}

}