C#操作 ACCESS

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> /// DataAccess 的摘要說明 /// </summary> public class DataAccess { protected static OleDbConnection conn = new OleDbConnection(); protected static OleDbCommand comm = new OleDbCommand(); public DataAccess() { //init } private static void openConnection() { if (conn.State == ConnectionState.Closed) { conn.ConnectionString = @"Provider=Microsoft.Jet.OleDb.4.0;Data Source="+ConfigurationManager.AppSettings["myconn"];//web.config文件裏設定。 comm.Connection = conn; try { conn.Open(); } catch (Exception e) { throw new Exception(e.Message); } } }//打開數據庫 private static void closeConnection() { if (conn.State == ConnectionState.Open) { conn.Close(); conn.Dispose(); comm.Dispose(); } }//關閉數據庫 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(); } }//執行sql語句 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; }//返回指定sql語句的OleDbDataReader對象，使用時請注意關閉這個對象。 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(); } } }//返回指定sql語句的OleDbDataReader對象,使用時請注意關閉 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; }//返回指定sql語句的dataset 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(); } }//返回指定sql語句的dataset 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; }//返回指定sql語句的datatable 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(); } }//返回指定sql語句的datatable 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; } //返回指定sql語句的dataview } 

 

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