C#实现的ACCESS数据库操作类完整实例

using System;using System.Text;using System.Collections;using System.Collections.Specialized;using System.Data;using System.Data.OleDb;using System.Configuration;namespace HoverTree.Web.DBUtility{  /// <summary>  /// 数据访问抽象基础类(ACCESS)  /// Copyright (C) 2006-2007 hovertree.net  /// All rights reserved  /// </summary>  public abstract class DbHelperACE  {    //数据库连接字符串(web.config来配置)    //public static string connectionString = ConfigurationManager.AppSettings["ConnectionString"];    // public static string connectionString = System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["AccessConnectionString"]);    public static string connectionString = ConfigurationManager.AppSettings["AccessConnectionString"];    public DbHelperACE()    {    }    #region 公用方法    public static int GetMaxID(string FieldName, string TableName)    {      string strsql = "select max(" + FieldName + ")+1 from " + TableName;      object obj = DbHelperACE.GetSingle(strsql);      if (obj == null)      {        return 1;      }      else      {        return int.Parse(obj.ToString());      }    }    public static bool Exists(string strSql)    {      object obj = DbHelperACE.GetSingle(strSql);      int cmdresult;      if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))      {        cmdresult = 0;      }      else      {        cmdresult = int.Parse(obj.ToString());      }      if (cmdresult == 0)      {        return false;      }      else      {        return true;      }    }    public static bool Exists(string strSql, params OleDbParameter[] cmdParms)    {      object obj = DbHelperACE.GetSingle(strSql, cmdParms);      int cmdresult;      if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))      {        cmdresult = 0;      }      else      {        cmdresult = int.Parse(obj.ToString());      }      if (cmdresult == 0)      {        return false;      }      else      {        return true;      }    }    #endregion    #region 执行简单SQL语句    /// <summary>    /// 执行SQL语句，返回影响的记录数    /// </summary>    /// <param name="SQLString">SQL语句</param>    /// <returns>影响的记录数</returns>    public static int ExecuteSql(string SQLString)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))        {          try          {            connection.Open();            int rows = cmd.ExecuteNonQuery();            return rows;          }          catch (System.Data.OleDb.OleDbException E)          {            connection.Close();            throw new Exception(E.Message);          }        }      }    }    /// <summary>    /// 执行SQL语句，设置命令的执行等待时间    /// </summary>    /// <param name="SQLString"></param>    /// <param name="Times"></param>    /// <returns></returns>    public static int ExecuteSqlByTime(string SQLString, int Times)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))        {          try          {            connection.Open();            cmd.CommandTimeout = Times;            int rows = cmd.ExecuteNonQuery();            return rows;          }          catch (System.Data.OleDb.OleDbException E)          {            connection.Close();            throw new Exception(E.Message);          }        }      }    }    /// <summary>    /// 执行多条SQL语句，实现数据库事务。    /// </summary>    /// <param name="SQLStringList">多条SQL语句</param>    public static void ExecuteSqlTran(ArrayList SQLStringList)    {      using (OleDbConnection conn = new OleDbConnection(connectionString))      {        conn.Open();        OleDbCommand cmd = new OleDbCommand();        cmd.Connection = conn;        OleDbTransaction tx = conn.BeginTransaction();        cmd.Transaction = tx;        try        {          for (int n = 0; n < SQLStringList.Count; n++)          {            string strsql = SQLStringList[n].ToString();            if (strsql.Trim().Length > 1)            {              cmd.CommandText = strsql;              cmd.ExecuteNonQuery();            }          }          tx.Commit();        }        catch (System.Data.OleDb.OleDbException E)        {          tx.Rollback();          throw new Exception(E.Message);        }      }    }    /// <summary>    /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)    /// </summary>    /// <param name="strSQL">SQL语句</param>    /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>    /// <returns>影响的记录数</returns>    public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        OleDbCommand cmd = new OleDbCommand(strSQL, connection);        System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@fs", SqlDbType.Image);        myParameter.Value = fs;        cmd.Parameters.Add(myParameter);        try        {          connection.Open();          int rows = cmd.ExecuteNonQuery();          return rows;        }        catch (System.Data.OleDb.OleDbException E)        {          throw new Exception(E.Message);        }        finally        {          cmd.Dispose();          connection.Close();        }      }    }    /// <summary>    /// 执行一条计算查询结果语句，返回查询结果（object）。    /// </summary>    /// <param name="SQLString">计算查询结果语句</param>    /// <returns>查询结果（object）</returns>    public static object GetSingle(string SQLString)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))        {          try          {            connection.Open();            object obj = cmd.ExecuteScalar();            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))            {              return null;            }            else            {              return obj;            }          }          catch (System.Data.OleDb.OleDbException e)          {            connection.Close();            throw new Exception(e.Message);          }        }      }    }    /// <summary>    /// 执行查询语句，返回SqlDataReader(使用该方法切记要手工关闭SqlDataReader和连接)    /// </summary>    /// <param name="strSQL">查询语句</param>    /// <returns>SqlDataReader</returns>    public static OleDbDataReader ExecuteReader(string strSQL)    {      OleDbConnection connection = new OleDbConnection(connectionString);      OleDbCommand cmd = new OleDbCommand(strSQL, connection);      try      {        connection.Open();        OleDbDataReader myReader = cmd.ExecuteReader();        return myReader;      }      catch (System.Data.OleDb.OleDbException e)      {        throw new Exception(e.Message);      }      //finally //不能在此关闭，否则，返回的对象将无法使用      //{      // cmd.Dispose();      // connection.Close();      //}    }    /// <summary>    /// 执行查询语句，返回DataSet    /// </summary>    /// <param name="SQLString">查询语句</param>    /// <returns>DataSet</returns>    public static DataSet Query(string SQLString)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        DataSet ds = new DataSet();        try        {          connection.Open();          OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);          command.Fill(ds, "ds");        }        catch (System.Data.OleDb.OleDbException ex)        {          throw new Exception(ex.Message);        }        return ds;      }    }    /// <summary>    /// 执行查询语句，返回DataSet,设置命令的执行等待时间    /// </summary>    /// <param name="SQLString"></param>    /// <param name="Times"></param>    /// <returns></returns>    public static DataSet Query(string SQLString, int Times)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        DataSet ds = new DataSet();        try        {          connection.Open();          OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);          command.SelectCommand.CommandTimeout = Times;          command.Fill(ds, "ds");        }        catch (System.Data.OleDb.OleDbException ex)        {          throw new Exception(ex.Message);        }        return ds;      }    }    #endregion    #region 执行带参数的SQL语句    /// <summary>    /// 执行SQL语句，返回影响的记录数    /// </summary>    /// <param name="SQLString">SQL语句</param>    /// <returns>影响的记录数</returns>    public static int ExecuteSql(string SQLString, params OleDbParameter[] cmdParms)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        using (OleDbCommand cmd = new OleDbCommand())        {          try          {            PrepareCommand(cmd, connection, null, SQLString, cmdParms);            int rows = cmd.ExecuteNonQuery();            cmd.Parameters.Clear();            return rows;          }          catch (System.Data.OleDb.OleDbException E)          {            throw new Exception(E.Message);          }        }      }    }    /// <summary>    /// 执行多条SQL语句，实现数据库事务。    /// </summary>    /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OleDbParameter[]）</param>    public static void ExecuteSqlTran(Hashtable SQLStringList)    {      using (OleDbConnection conn = new OleDbConnection(connectionString))      {        conn.Open();        using (OleDbTransaction trans = conn.BeginTransaction())        {          OleDbCommand cmd = new OleDbCommand();          try          {            //循环            foreach (DictionaryEntry myDE in SQLStringList)            {              string cmdText = myDE.Key.ToString();              OleDbParameter[] cmdParms = (OleDbParameter[])myDE.Value;              PrepareCommand(cmd, conn, trans, cmdText, cmdParms);              int val = cmd.ExecuteNonQuery();              cmd.Parameters.Clear();              trans.Commit();            }          }          catch          {            trans.Rollback();            throw;          }        }      }    }    /// <summary>    /// 执行一条计算查询结果语句，返回查询结果（object）。    /// </summary>    /// <param name="SQLString">计算查询结果语句</param>    /// <returns>查询结果（object）</returns>    public static object GetSingle(string SQLString, params OleDbParameter[] cmdParms)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        using (OleDbCommand cmd = new OleDbCommand())        {          try          {            PrepareCommand(cmd, connection, null, SQLString, cmdParms);            object obj = cmd.ExecuteScalar();            cmd.Parameters.Clear();            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))            {              return null;            }            else            {              return obj;            }          }          catch (System.Data.OleDb.OleDbException e)          {            throw new Exception(e.Message);          }        }      }    }      /// <summary>    /// 执行查询语句，返回SqlDataReader (使用该方法切记要手工关闭SqlDataReader和连接)    /// </summary>    /// <param name="strSQL">查询语句</param>    /// <returns>SqlDataReader</returns>    public static OleDbDataReader ExecuteReader(string SQLString, params OleDbParameter[] cmdParms)    {      OleDbConnection connection = new OleDbConnection(connectionString);      OleDbCommand cmd = new OleDbCommand();      try      {        PrepareCommand(cmd, connection, null, SQLString, cmdParms);        OleDbDataReader myReader = cmd.ExecuteReader();        cmd.Parameters.Clear();        return myReader;      }      catch (System.Data.OleDb.OleDbException e)      {        throw new Exception(e.Message);      }      //finally //不能在此关闭，否则，返回的对象将无法使用      //{      // cmd.Dispose();      // connection.Close();      //}    }    /// <summary>    /// 执行查询语句，返回DataSet    /// </summary>    /// <param name="SQLString">查询语句</param>    /// <returns>DataSet</returns>    public static DataSet Query(string SQLString, params OleDbParameter[] cmdParms)    {      using (OleDbConnection connection = new OleDbConnection(connectionString))      {        OleDbCommand cmd = new OleDbCommand();        PrepareCommand(cmd, connection, null, SQLString, cmdParms);        using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))        {          DataSet ds = new DataSet();          try          {            da.Fill(ds, "ds");            cmd.Parameters.Clear();          }          catch (System.Data.OleDb.OleDbException ex)          {            throw new Exception(ex.Message);          }          return ds;        }      }    }    private static void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, string cmdText, OleDbParameter[] cmdParms)    {      if (conn.State != ConnectionState.Open)        conn.Open();      cmd.Connection = conn;      cmd.CommandText = cmdText;      if (trans != null)        cmd.Transaction = trans;      cmd.CommandType = CommandType.Text;//cmdType;      if (cmdParms != null)      {        foreach (OleDbParameter parameter in cmdParms)        {          if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&            (parameter.Value == null))          {            parameter.Value = DBNull.Value;          }          cmd.Parameters.Add(parameter);        }      }    }    #endregion    #region 获取根据指定字段排序并分页查询。        /// <summary>    /// 分页查询数据记录总数获取    /// </summary>    /// <param name="_tbName">----要显示的表或多个表的连接</param>    /// <param name="_ID">----主表的主键</param>    /// <param name="_strCondition">----查询条件,不需where</param>    /// <param name="_Dist">----是否添加查询字段的 DISTINCT 默认0不添加/1添加</param>    /// <returns></returns>    public static string getPageListCounts(string _ID, string _tbName, string _strCondition, int _Dist)    {      //---存放取得查询结果总数的查询语句      //---对含有DISTINCT的查询进行SQL构造      //---对含有DISTINCT的总数查询进行SQL构造      string strTmp = "", SqlSelect = "", SqlCounts = "";      if (_Dist == 0)      {        SqlSelect = "Select ";        SqlCounts = "COUNT(*)";      }      else      {        SqlSelect = "Select DISTINCT ";        SqlCounts = "COUNT(DISTINCT " + _ID + ")";      }      if (_strCondition == string.Empty)      {        strTmp = SqlSelect + " "+ SqlCounts + " FROM " + _tbName;      }      else      {        strTmp = SqlSelect + " "+ SqlCounts + " FROM " + " Where (1=1) " + _strCondition;      }      return strTmp;    }    /// <summary>    /// 智能返回SQL语句    /// </summary>    /// <param name="primaryKey">主键（不能为空）</param>    /// <param name="queryFields">提取字段（不能为空）</param>    /// <param name="tableName">表（理论上允许多表）</param>    /// <param name="condition">条件（可以空）</param>    /// <param name="OrderBy">排序，格式：字段名+""+ASC（可以空）</param>    /// <param name="pageSize">分页数（不能为空）</param>    /// <param name="pageIndex">当前页，起始为：1（不能为空）</param>    /// <returns></returns>    public static string getPageListSql(string primaryKey, string queryFields, string tableName, string condition, string orderBy, int pageSize, int pageIndex)    {      string strTmp = ""; //---strTmp用于返回的SQL语句      string SqlSelect = "", SqlPrimaryKeySelect = "", strOrderBy = "", strWhere = " where 1=1 ", strTop = "";      //0：分页数量      //1:提取字段      //2:表      //3:条件      //4:主键不存在的记录      //5:排序      SqlSelect = " select top {0} {1} from {2} {3} {4} {5}";      //0:主键      //1:TOP数量,为分页数*(排序号-1)      //2:表      //3:条件      //4:排序      SqlPrimaryKeySelect = " and {0} not in (select {1} {0} from {2} {3} {4}) ";      if (orderBy != "")        strOrderBy = " order by " + orderBy;      if (condition != "")        strWhere += " and " + condition;      int pageindexsize = (pageIndex - 1) * pageSize;      if (pageindexsize > 0)      {        strTop = " top " + pageindexsize.ToString();        SqlPrimaryKeySelect = String.Format(SqlPrimaryKeySelect, primaryKey, strTop, tableName, strWhere, strOrderBy);        strTmp = String.Format(SqlSelect, pageSize.ToString(), queryFields, tableName, strWhere, SqlPrimaryKeySelect, strOrderBy);      }      else      {        strTmp = String.Format(SqlSelect, pageSize.ToString(), queryFields, tableName, strWhere, "", strOrderBy);      }      return strTmp;    }    /// <summary>    /// 获取根据指定字段排序并分页查询。DataSet    /// </summary>    /// <param name="pageSize">每页要显示的记录的数目</param>    /// <param name="pageIndex">要显示的页的索引</param>    /// <param name="tableName">要查询的数据表</param>    /// <param name="queryFields">要查询的字段,如果是全部字段请填写：*</param>    /// <param name="primaryKey">主键字段，类似排序用到</param>    /// <param name="orderBy">是否为升序排列：0为升序，1为降序</param>    /// <param name="condition">查询的筛选条件</param>    /// <returns>返回排序并分页查询的DataSet</returns>    public static DataSet GetPagingList(string primaryKey, string queryFields, string tableName, string condition, string orderBy, int pageSize, int pageIndex)    {      string sql = getPageListSql(primaryKey, queryFields, tableName, condition, orderBy, pageSize, pageIndex);      return Query(sql);    }    public static string GetPagingListSQL(string primaryKey, string queryFields, string tableName, string condition, string orderBy, int pageSize, int pageIndex)    {      string sql = getPageListSql(primaryKey, queryFields, tableName, condition, orderBy, pageSize, pageIndex);      return sql;    }    public static int GetRecordCount(string _ID, string _tbName, string _strCondition, int _Dist)    {      string sql = getPageListCounts( _ID, _tbName, _strCondition, _Dist);      object obj = DbHelperACE.GetSingle(sql);      if (obj == null)      {        return 1;      }      else      {        return int.Parse(obj.ToString());      }    }    #endregion  }}