C#实现的ACCESS数据库操作类完整实例

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！

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
{  /// 

  /// 数据访问抽象基础类(ACCESS)
  /// Copyright (C) 2006-2007 hovertree.net
  /// All rights reserved
  /// 
  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
    /// 

    /// 执行SQL语句，返回影响的记录数
    /// 
    /// SQL语句
    /// 影响的记录数
    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);
   }
 }
      }
    }
    /// 

    /// 执行SQL语句，设置命令的执行等待时间
    /// 
    /// 
    /// 
    /// 
    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);
   }
 }
      }
    }
    /// 

    /// 执行多条SQL语句，实现数据库事务。
    /// 
    /// 多条SQL语句
    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);
 }
      }
    }
    /// 

    /// 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)
    /// 
    /// SQL语句
    /// 图像字节,数据库的字段类型为image的情况
    /// 影响的记录数
    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();
 }
      }
    }
    /// 

    /// 执行一条计算查询结果语句，返回查询结果（object）。
    /// 
    /// 计算查询结果语句
    /// 查询结果（object）
    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);
   }
 }
      }
    }
    /// 

    /// 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)
    /// 
    /// 查询语句
    /// SqlDataReader
    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();
      //}
    }
    /// 

    /// 执行查询语句，返回DataSet
    /// 
    /// 查询语句
    /// DataSet
    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;
      }
    }
    /// 

    /// 执行查询语句，返回DataSet,设置命令的执行等待时间
    /// 
    /// 
    /// 
    /// 
    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
    /// 

    /// 执行SQL语句，返回影响的记录数
    /// 
    /// SQL语句
    /// 影响的记录数
    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);
   }
 }
      }
    }
    /// 

    /// 执行多条SQL语句，实现数据库事务。
    /// 
    /// SQL语句的哈希表（key为sql语句，value是该语句的OleDbParameter[]）
    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;
   }
 }
      }
    }
    /// 

    /// 执行一条计算查询结果语句，返回查询结果（object）。
    /// 
    /// 计算查询结果语句
    /// 查询结果（object）
    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);
   }
 }
      }
    }  
    /// 

    /// 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)
    /// 
    /// 查询语句
    /// SqlDataReader
    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();
      //}
    }
    /// 

    /// 执行查询语句，返回DataSet
    /// 
    /// 查询语句
    /// DataSet
    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。
    
    /// 

    /// 分页查询数据记录总数获取
    /// 
    /// ----要显示的表或多个表的连接
    /// ----主表的主键
    /// ----查询条件,不需where
    /// ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
    /// 
    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;
    }
    /// 

    /// 智能返回SQL语句
    /// 
    /// 主键（不能为空）
    /// 提取字段（不能为空）
    /// 表（理论上允许多表）
    /// 条件（可以空）
    /// 排序，格式：字段名+""+ASC（可以空）
    /// 分页数（不能为空）
    /// 当前页，起始为：1（不能为空）
    /// 
    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;
    }
    /// 

    /// 获取根据指定字段排序并分页查询。DataSet
    /// 
    /// 每页要显示的记录的数目
    /// 要显示的页的索引
    /// 要查询的数据表
    /// 要查询的字段,如果是全部字段请填写：*
    /// 主键字段，类似排序用到
    /// 是否为升序排列：0为升序，1为降序
    /// 查询的筛选条件
    /// 返回排序并分页查询的DataSet
    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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