package javatemplate1;
//pgsVisitor1B   for testing codes 
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) throws InterruptedException {
        // 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";
 
      // connecting to db
      try {
          // connection>>statement >> Resultset 
       c = DriverManager.getConnection(dbURL,user,pwd);
    
        //inserting data using String [] and for loop
    // String sqlQuery= " SELECT id, fname, lname, age FROM pgsvisitor1b where fname like'%J%'";
     String sqlQuery= " SELECT id, fname, lname, age FROM pgsvisitor1b where fname like ?";
     String search = "J"; 
      //Select * from pgsVisitor1B 
       //st = c.createStatement();
       //rs = st.executeQuery(sqlQuery);
    PreparedStatement ps = c.prepareStatement(sqlQuery);
    ps.setString(1, "%" + search + "%");
    rs = ps.executeQuery();
    //
     // st = c.createStatement();
      //rs= st.executeQuery(sqlQuery);
       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);
}

}