C# 数据库访问类 SQLServer 和 Access

using System; using System.Data; using System.Configuration; using System.Data.OleDb; namespace xxxxx { /// <summary> /// Access数据库访问类 /// </summary> public class DataAccess { private static OleDbConnection conn = new OleDbConnection(); private static OleDbCommand comm = new OleDbCommand(); private static string asscessPath = @".\PoliScan.mdb"; /// <summary> /// 设置Access数据库路径 /// </summary> /// <param name="path">完整的路径字符串</param> public static void SetAccessPath(string path) { asscessPath = path; } /// <summary> /// 打开数据库 /// </summary> /// <returns>成功返回 true；失败返回 false；异常时抛出异常</returns> public static bool OpenConnection() { bool retval = false; if (conn.State != ConnectionState.Open) { conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source=" + asscessPath; comm.Connection = conn; try { conn.Open(); if (conn.State == ConnectionState.Open) { retval = true; } } catch (Exception e) { throw new Exception(e.Message); } ............................ ............................ using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Data.OleDb; using System.Data.SqlClient; /// <summary> /// DataBase 的摘要说明 /// </summary> public class DataBase : IDisposable { public DataBase() { // // TODO: 在此处添加构造函数逻辑 // } private SqlConnection con; //创建连接对象 #region 打开数据库连接 /// <summary> /// 打开数据库连接. /// </summary> private void Open() { // 打开数据库连接 if (con == null) { con = new SqlConnection("Data Source = . ;Database = CET ;Integrated Security = SSPI "); } if (con.State == System.Data.ConnectionState.Closed) con.Open(); }