public static class AccessHelper
{
//数据库连接字符串
//WebForm
//public static readonly string conn_str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + HttpContext.Current.Request.PhysicalApplicationPath + System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
//WinForm
//public static readonly string conn_str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + AppDomain.CurrentDomain.BaseDirectory + System.Configuration.ConfigurationManager.ConnectionStrings["WZDFGL"].ConnectionString;
//public static readonly string conn_str = System.Configuration.ConfigurationManager.ConnectionStrings["WZDFGL"].ConnectionString;
public static readonly string conn_str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + AppDomain.CurrentDomain.BaseDirectory + System.Configuration.ConfigurationManager.ConnectionStrings["WZDFGL"].ConnectionString + ";Persist Security Info=True";
// 用于缓存参数的HASH表
private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
/// <summary>
/// 给定连接的数据库用假设参数执行一个sql命令（不返回数据集）
/// </summary>
/// <param name="connectionString">一个有效的连接字符串</param>
/// <param name="commandText">存储过程名称或者sql命令语句</param>
/// <param name="commandParameters">执行命令所用参数的集合</param>
/// <returns>执行命令所影响的行数</returns>
public static int ExecuteNonQuery(string connectionString, string cmdText, params OleDbParameter[] commandParameters)
{
OleDbCommand cmd = new OleDbCommand();
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
PrepareCommand(cmd, conn, null, cmdText, commandParameters);
int val = cmd.ExecuteNonQuery();
