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服务器之家 - 编程语言 - C# - C#实现的ACCESS数据库操作类完整实例

C#实现的ACCESS数据库操作类完整实例

2022-01-05 13:06roucheng C#

这篇文章主要介绍了C#实现的ACCESS数据库操作类,结合完整实例形式分析了C#针对access数据库增删改查、事务、结果处理等相关操作技巧,需要的朋友可以参考下

本文实例讲述了C#实现的ACCESS数据库操作类。分享给大家供大家参考,具体如下:

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!

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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
  }
}

希望本文所述对大家C#程序设计有所帮助。

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