AccessHelper代码,CSharp代码库,德仔网

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【CSharp】 AccessHelper
作者:伊菲 / 发布于2014/11/18/ 547

	using System;
	using System.Data;
	using System.Configuration;
	using System.Data.OleDb;
	using ahwildlife.Utils;

	
	/// <summary>
	/// AccessHelper 的摘要说明
	/// </summary>
	public class AccessHelper
	{
	 #region 变量
	 protected static OleDbConnection conn = new OleDbConnection();
	 protected static OleDbCommand comm = new OleDbCommand();
	 protected static string connectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=ahwildlife.mdb;Persist Security Info=False;Jet OLEDB:Database Password=sa;";
	 #endregion

	 #region 构造函数
	 /// <summary>
	 /// 构造函数
	 /// </summary>
	 public AccessHelper()
	 {

	 }
	 #endregion

	 #region 打开数据库
	 /// <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=ahwildlife.mdb;Persist Security Info=False;Jet OLEDB:Database Password=sa;";
	 comm.Connection = conn;
	 try
	 {
	 conn.Open();
	 }
	 catch (Exception ex)
	 {
	 throw new Exception(ex.Message);
	 }
	 }
	 }
	 #endregion

	 #region 关闭数据库
	 /// <summary>
	 /// 关闭数据库
	 /// </summary>
	 private static void closeConnection()
	 {
	 if (conn.State == ConnectionState.Open)
	 {
	 conn.Close();
	 conn.Dispose();
	 comm.Dispose();
	 }
	 }
	 #endregion

	 #region 执行sql语句
	 /// <summary>
	 /// 执行sql语句
	 /// </summary>
	 public static void ExecuteSql(string sqlstr)
	 {
	 try
	 {
	 openConnection();
	 comm.CommandType = CommandType.Text;
	 comm.CommandText = sqlstr;
	 comm.ExecuteNonQuery();
	 }
	 catch (Exception ex)
	 {
	 throw new Exception(ex.Message);
	 }
	 finally
	 {
	 closeConnection();
	 }
	 }
	 #endregion

	 #region 返回指定sql语句的OleDbDataReader对象,使用时请注意关闭这个对象。
	 /// <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>
	 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;
	 }
	 #endregion

	 #region 返回指定sql语句的OleDbDataReader对象,使用时请注意关闭
	 /// <summary>
	 /// 返回指定sql语句的OleDbDataReader对象,使用时请注意关闭
	 /// </summary>
	 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();
	 }
	 }
	 }
	 #endregion

	 #region 返回指定sql语句的DataSet
	 /// <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;
	 }
	 #endregion

	 #region 返回指定sql语句的DataSet
	 /// <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();
	 }
	 }
	 #endregion

	 #region 返回指定sql语句的DataTable
	 /// <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 = Common.GetDataTableCache(sqlstr);//读缓存
	 if (dt != null)
	 {
	 return dt.Copy();
	 }
	 else
	 {
	 dt = new DataTable();
	 OleDbDataAdapter da = new OleDbDataAdapter();
	 try
	 {
	 using (OleDbConnection conn = new OleDbConnection())
	 {
	 conn.ConnectionString = connectionString;
	 conn.Open();
	 using (OleDbCommand comm = new OleDbCommand())
	 {
	 comm.Connection = conn;
	 comm.CommandType = CommandType.Text;
	 comm.CommandText = sqlstr;
	 da.SelectCommand = comm;
	 da.Fill(dt);
	 }
	 }
	 }
	 catch (Exception e)
	 {
	 throw new Exception(e.Message);
	 }
	 finally
	 {
	 closeConnection();
	 }
	 Common.InsertDataTableCache(sqlstr, dt);//添加缓存
	 return dt.Copy();
	 }
	 }
	 #endregion

	 #region 返回指定sql语句的DataTable
	 /// <summary>
	 /// 返回指定sql语句的DataTable
	 /// </summary>
	 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();
	 }
	 }
	 #endregion

	 #region 返回指定sql语句的DataView
	 /// <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;
	 }
	 #endregion

	}
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