Descarga No. 11

Programación
bien, ahora ya tenemos una tabla para trabajar y probar los ejemplos para el objeto Command:
using System;
using System.Data;
using Npgsql;
namespace godel.examples{
public class ejemplo2{
static NpgsqlConnection conn = null;
static NpgsqlCommand cmd = null;
public static int Main(string[] args){
Console.WriteLine("Probando un comando a la base de datos...");
try{
int rowsAffected = 0;
int opcion = 0;
conn = new NpgsqlConnection();
conn.ConnectionString = @"Server=127.0.0.1;Port=5432;User
Id=postgres;Password=chikome;Database=pubs";
conn.Open();
cmd = new NpgsqlCommand();
cmd.Connection = conn;
Console.WriteLine("Eliga el tipo de comando:");
Console.WriteLine("[1] INSERT into authors VALUES('Carson','Cheryl','415
548-7223','589 Darwin Ln.','Berkeley','CA','94705','1')");
Console.WriteLine("[2] UPDATE authors set au_fname = 'Martin' WHERE au_id = 1");
Console.WriteLine("[3] DELETE from authors WHERE au_fname = 'Martin'");
Console.Write("Elija opcion ");
opcion = Console.Read();
switch(opcion){
case 1:
cmd.CommandText = "INSERT into
authors(au_lname,au_fname,phone,address,city,state,zip,contract)VALUES('Carson','Cheryl','415
548-7223','589 Darwin Ln.','Berkeley','CA','94705','1')";
break;
case 2:
cmd.CommandText = "UPDATE authors set au_fname = 'Martin' WHERE
au_fname = 'Johnson'";
break;
case 3:
cmd.CommandText = "DELETE from authors WHERE au_fname = 'Martin'";
break;
default:
cmd.CommandText = "INSERT into
authors(au_lname,au_fname,phone,address,city,state,zip,contract)VALUES('Carson','Cheryl','415
548-7223','589 Darwin Ln.','Berkeley','CA','94705','1')";
break;
}
rowsAffected = cmd.ExecuteNonQuery();
Console.WriteLine("(" + rowsAffected + ") registro(s) afectados");
conn.Close();
return 0;
}catch(Exception e){
Console.WriteLine("Sin conexion por {0}",e.ToString());
return -1;
}finally{
conn.Close();
}
PÁGINA 43
BEGINS 11 I OCTUBRE 2007