Java база данных

import java.sql.*;
 
public class MysqlConnect{
  public static void main(String[] args) {
  System.out.println("MySQL Connect Example.");
  Connection conn = null;
  String url = "jdbc:mysql://localhost:3306/";
  String dbName = "jdbctutorial";
  String driver = "com.mysql.jdbc.Driver";
  String userName = "root"; 
  String password = "root";
  try {
  Class.forName(driver).newInstance();
  conn = DriverManager.getConnection(url+dbName,userName,password);
  System.out.println("Connected to the database");
  conn.close();
  System.out.println("Disconnected from database");
  } catch (Exception e) {
  e.printStackTrace();
  }
  }
}

try{
  Statement st = con.createStatement();
  BufferedReader bf = new BufferedReader
(new InputStreamReader(System.in));
  System.out.println("Enter Database name:");
  String database = bf.readLine();
  st.executeUpdate("CREATE DATABASE "+database);
  System.out.println("1 row(s) affacted");
  }
  catch (SQLException s){
  System.out.println("SQL statement is not executed!");
  }

try{
  Statement st = con.createStatement();
  String table = 
  "CREATE TABLE Employee11(Emp_code integer, Emp_name varchar(10))";
  st.executeUpdate(table);
  System.out.println("Table creation process successfully!");
  }
  catch(SQLException s){
  System.out.println("Table all ready exists!");
  }

try{
  Statement st = con.createStatement();
  int val = st.executeUpdate("INSERT employee VALUES("+13+","+"'Aman'"+")");
  System.out.println("1 row affected");
  }
  catch (SQLException s){
  System.out.println("SQL statement is not executed!");
  }

 try{
  Statement st = con.createStatement();
  ResultSet res = st.executeQuery("SELECT * FROM  employee6");
  System.out.println("Emp_code: " + "\t" + "Emp_name: ");
  while (res.next()) {
  int i = res.getInt("Emp_code");
  String s = res.getString("Emp_name");
  System.out.println(i + "\t\t" + s);
  }

 try{
  PreparedStatement prest = con.prepareStatement("insert emp_sal values(?,?)");
  prest.setObject(1,"Sushil");
  prest.setObject(2,15000);
  int n = prest.executeUpdate();
  System.out.println(n + " Record is added in the table.");
  con.close();
  }
  catch (SQLException s){
  System.out.println("SQL statement is not executed!");
  }

st.executeQuery("SELECT Inventory_number FROM Journal WHERE Inventory_number = "+"'"+rs+"'");