JDBC_Postgresql

JDBC_Postgresql  


//STEP 1. Import required packages
import java.sql.*;

public class jdbc {
   // JDBC driver name and database URL
   static  String JDBC_DRIVER = "org.postgresql.Driver";  
   static  String DB_URL = "jdbc:postgresql://localhost:5432/SPS_Sales_DB";
                       
   //  Database credentials
   static  String USER = "youtilitydba";
   static  String PASS = "Youtility11";
   
   public static void main(String[] args) {
   Connection conn = null;
   Statement stmt = null;
   try{
      //STEP 2: Register JDBC driver
      Class.forName("org.postgresql.Driver");

      //STEP 3: Open a connection
      System.out.println("Connecting to database...");
      conn = DriverManager.getConnection(DB_URL,USER,PASS);

      //STEP 4: Execute a query
      System.out.println("Creating statement...");
      stmt = conn.createStatement();
      String sql;
      sql = "SELECT id, model FROM devices";
      ResultSet rs = stmt.executeQuery(sql);

      //STEP 5: Extract data from result set
      while(rs.next()){
         //Retrieve by column name
         int id  = rs.getInt(1);
         String model = rs.getString(2);
         
         //Display values
         System.out.println("ID: " + id);
         System.out.println("model: " + model);
        
      }
      //STEP 6: Clean-up environment
      rs.close();
      stmt.close();
      conn.close();
   }catch(SQLException se){
      //Handle errors for JDBC
      se.printStackTrace();
   }catch(Exception e){
      //Handle errors for Class.forName
      e.printStackTrace();
   }finally{
     
      try{
         if(conn!=null)
            conn.close();
      }catch(SQLException se){
         se.printStackTrace();
      }//end finally try
   }//end try
   System.out.println("Goodbye!");
}//end main
}//end FirstExample