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; /// <summary> /// AccessHelper 的摘要说明 /// </summary> public class AccessHelper { protected static OleDbConnection conn = new OleDbConnection(); protected static OleDbCommand comm = new OleDbCommand();public AccessHelper()
{ // // TODO: 在此处添加构造函数逻辑 // }/// <summary>
/// 打开数据库 /// </summary> private static void openConnection() { if (conn.State == ConnectionState.Closed) { conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source=" + HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["myconn"]); comm.Connection = conn; try { conn.Open(); } catch (Exception e) { throw new Exception(e.Message); }}
}
/// <summary> /// 关闭数据库 /// </summary> private static void closeConnection() { if (conn.State == ConnectionState.Open) { conn.Close(); conn.Dispose(); comm.Dispose(); } } /// <summary> /// 执行sql语句 /// </summary> /// <param name="sqlstr"></param> public static void excuteSql(string sqlstr) { try { openConnection(); comm.CommandType = CommandType.Text; comm.CommandText = sqlstr; comm.ExecuteNonQuery(); } catch (Exception e) { throw new Exception(e.Message); } finally { closeConnection(); } } /// <summary> /// 返回指定sql语句的OleDbDataReader对象，使用时请注意关闭这个对象。 /// </summary> /// <param name="sqlstr"></param> /// <returns></returns> public static OleDbDataReader dataReader(string sqlstr) { OleDbDataReader dr = null; try { openConnection(); comm.CommandText = sqlstr; comm.CommandType = CommandType.Text;dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
} catch { try { dr.Close(); closeConnection(); } catch { } } return dr; } /// <summary> /// 返回指定sql语句的OleDbDataReader对象,使用时请注意关闭 /// </summary> /// <param name="sqlstr"></param> /// <param name="dr"></param> public static void dataReader(string sqlstr, ref OleDbDataReader dr) { try { openConnection(); comm.CommandText = sqlstr; comm.CommandType = CommandType.Text; dr = comm.ExecuteReader(CommandBehavior.CloseConnection); } catch { try { if (dr != null && !dr.IsClosed) dr.Close(); } catch { } finally { closeConnection(); } } } /// <summary> /// 返回指定sql语句的dataset /// </summary> /// <param name="sqlstr"></param> /// <returns></returns> public static DataSet dataSet(string sqlstr) { DataSet ds = new DataSet(); OleDbDataAdapter da = new OleDbDataAdapter(); try { openConnection(); comm.CommandType = CommandType.Text; comm.CommandText = sqlstr; da.SelectCommand = comm; da.Fill(ds);}
catch (Exception e) { throw new Exception(e.Message); } finally { closeConnection(); } return ds; } /// <summary> /// 返回指定sql语句的dataset /// </summary> /// <param name="sqlstr"></param> /// <param name="ds"></param> public static void dataSet(string sqlstr, ref DataSet ds) { OleDbDataAdapter da = new OleDbDataAdapter(); try { openConnection(); comm.CommandType = CommandType.Text; comm.CommandText = sqlstr; da.SelectCommand = comm; da.Fill(ds); } catch (Exception e) { throw new Exception(e.Message); } finally { closeConnection(); } } /// <summary> /// 返回指定sql语句的datatable /// </summary> /// <param name="sqlstr"></param> /// <returns></returns> public static DataTable dataTable(string sqlstr) { DataTable dt = new DataTable(); OleDbDataAdapter da = new OleDbDataAdapter(); try { openConnection(); comm.CommandType = CommandType.Text; comm.CommandText = sqlstr; da.SelectCommand = comm; da.Fill(dt); } catch (Exception e) { throw new Exception(e.Message); } finally { closeConnection(); } return dt; } /// <summary> /// 返回指定sql语句的datatable /// </summary> /// <param name="sqlstr"></param> /// <param name="dt"></param> public static void dataTable(string sqlstr, ref DataTable dt) { OleDbDataAdapter da = new OleDbDataAdapter(); try { openConnection(); comm.CommandType = CommandType.Text; comm.CommandText = sqlstr; da.SelectCommand = comm; da.Fill(dt); } catch (Exception e) { throw new Exception(e.Message); } finally { closeConnection(); } } /// <summary> /// 返回指定sql语句的dataview /// </summary> /// <param name="sqlstr"></param> /// <returns></returns> public static DataView dataView(string sqlstr) { OleDbDataAdapter da = new OleDbDataAdapter(); DataView dv = new DataView(); DataSet ds = new DataSet(); try { openConnection(); comm.CommandType = CommandType.Text; comm.CommandText = sqlstr; da.SelectCommand = comm; da.Fill(ds); dv = ds.Tables[0].DefaultView; } catch (Exception e) { throw new Exception(e.Message); } finally { closeConnection(); } return dv; } }