Access的DBHelper.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
namespace TaobaoDAL
{
public class DBHelper
{
//引导数据库连接数据库调用Web.Config文件
private static OleDbConnection connection;
//创建连接|DataDirectory|\SchoolDB.mdb
public static OleDbConnection Connection
{//Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & server.mappath("tushu.mdb")";Persist Security Info=False
get
{
OleDbConnection myConn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\taobao.mdb");
string connectionString = myConn.ConnectionString;
if (connection == null)
{
connection = new OleDbConnection(connectionString);
//打开连接
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;
}
}
//（无参）返回执行的行数(删除修改更新)
public static int ExecuteCommand(string safeSql)
{
OleDbCommand cmd = new OleDbCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
//（有参）
public static int ExecuteCommand(string sql, params OleDbParameter[] values)
{
OleDbCommand cmd = new OleDbCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();