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 的摘要说明

/// </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文件里设定。

comm.Connection = conn;

try

{

conn.Open();

}

catch (Exception e)

{ throw new Exception(e.Message); }

}

}//打开数据库

private static void closeConnection()

{

if (conn.State == ConnectionState.Open)

{

conn.Close();

conn.Dispose();

comm.Dispose();

}

}//关闭数据库

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(); }

}//执行sql语句

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语句的OleDbDataReader对象，使用时请注意关闭这个对象。

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语句的OleDbDataReader对象,使用时请注意关闭

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语句的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语句的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语句的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语句的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语句的dataview

}