1.数据库DAL:
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
namespace DAL
{
public static class DBHelper
{
private static SqlConnection connection;
public static SqlConnection Connection
{
get
{
string connectionString = @"Data Source=.;Initial Catalog=HouseManager;User ID=sa;password=123456";
if (connection == null)
{
connection = new SqlConnection(connectionString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
public static int ExecuteCommand(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
}
2.业务逻辑BLL:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HouseDAL;
using System.Data;
第3:表示层UI
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using HouseBLL;
namespace HouseUI.Users
{
public partial class FrmUserManager : Form
{
public FrmUserManager()
{
InitializeComponent();
}
private void btnLookAll_Click(object sender, EventArgs e)
{
HouseUI.Users.FrmAllAdmin fm = new FrmAllAdmin();
fm.Show();
}