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[ASP.net教程]C# ACCESS数据库操作类


这个是针对ACCESS数据库操作的类,同样也是从SQLHELPER提取而来,分页程序的调用可以参考MSSQL那个类的调用,差不多的,只是提取所有记录的数量的时候有多一个参数,这个需要注意一下!

 

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);            }          }        }      }  /* 何问起 hovertree.com */     /// <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。        /* 何问起 hovertree.com */     /// <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     }  }

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