基于SQLServer的数据层基类C#源码

/*****************************************************
 * 文 件 名：DBObject.cs
 * 功能描述：定义数据层基类。
 * 创 建 人：夏春涛 xchuntao@163.com qq:23106676
 * 创建时间：2004-08-11 11：05
 *****************************************************/

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace XD.XLB.JBC.JBInfo.WebModules.Data
{
 /// <summary>
 /// 数据层基类，提供对底层数据的基本操作
 /// </summary>
 public class DBObject
 {  
  private SqlConnection connection;
  
  #region 构造函数
  /// <summary>
  /// 构造函数，初始化数据连接对象
  /// </summary>
  public DBObject()
  {
   string connectionString = ConfigurationSettings.AppSettings.Get("ConnectionString");//从Web.Config中取得的连接字符串
   connection = new SqlConnection(connectionString);
  }

  /// <summary><table style="font-size:12px">
  /// <tr><td><b>功能描述</b>：构造函数，根据指定的数据连接字符串，初始化数据连接对象</td></tr>
  /// <tr><td><b>创 建 人</b>：夏春涛 </td></tr>
  /// <tr><td><b>创建时间</b>：2005-05-28 </td></tr>
  /// </table></summary>
  /// <param name="newConnectionString">数据连接字符串</param>
  public DBObject( string newConnectionString )
  {
   string connectionString = newConnectionString;
   connection = new SqlConnection( connectionString );
  }
  #endregion

  /// <summary>
  /// 数据连接对象（只读）
  /// </summary>  
  public SqlConnection Connection
  {
   get
   {
    return connection;
   }
   set
   {
    connection = value;
   }
  }  

  //-----------------------------------------------------------------------------------------
  //以下是从《ASP.Net Web站点高级编程》中Copy的（夏春涛）------------------------------------
  //-----------------------------------------------------------------------------------------
  /// <summary>
  /// 创建一个SqlCommand对象，用于获取存储过程的返回值
  /// </summary>
  /// <param name="storedProcName">存储过程名称</param>
  /// <param name="parameters">存储过程的参数对象列表（数组）</param>
  /// <returns>SqlCommand对象</returns>
  private SqlCommand BuildIntCommand(string storedProcName, IDataParameter[] parameters)
  {
   SqlCommand command = BuildQueryCommand( storedProcName, parameters );   

   command.Parameters.Add( new SqlParameter ( "ReturnValue",
    SqlDbType.Int,
    4, /* Size */
    ParameterDirection.ReturnValue,
    false, /* is nullable */
    0, /* byte precision */
    0, /* byte scale */
    string.Empty,
    DataRowVersion.Default,
    null ));

   return command;
  }

  /// <summary>
  /// 创建一个SqlCommand对象，用于生成SqlDataReader
  /// </summary>
  /// <param name="storedProcName">存储过程名称</param>
  /// <param name="parameters">存储过程的参数对象列表（数组）</param>
  /// <returns>SqlCommand对象</returns>
  private SqlCommand BuildQueryCommand(string storedProcName, IDataParameter[] parameters)
  {
   SqlCommand command = new SqlCommand( storedProcName, connection );
   command.CommandType = CommandType.StoredProcedure;

   foreach (SqlParameter parameter in parameters)
   {
    command.Parameters.Add( parameter );
   }

   return command;

  }

  /// <summary>
  /// 运行存储过程，获取影响数，返回存储过程运行结果
  /// </summary>
  /// <param name="storedProcName">存储过程名称</param>
  /// <param name="parameters">存储过程的参数对象列表（数组）</param>
  /// <param name="rowsAffected">出参：执行存储过程所影响的记录行数</param>
  /// <returns>存储过程的运行结果</returns>
  public object RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )
  {
   object result;

   if(connection.State.ToString() == "Closed")
    connection.Open();
   SqlCommand command = BuildIntCommand( storedProcName, parameters );
   rowsAffected = command.ExecuteNonQuery();
   result = command.Parameters["ReturnValue"].Value;
   connection.Close();
   return result;
  }

  /// <summary>
  /// 运行存储过程，返回产生的SqlDataReader对象
  /// </summary>
  /// <param name="storedProcName">存储过程名称</param>
  /// <param name="parameters">存储过程的参数对象列表（数组）</param>
  /// <returns>SqlDataReader对象</returns>
  public SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )
  {
   SqlDataReader returnReader;

   connection.Open();
   SqlCommand command = BuildQueryCommand( storedProcName, parameters );
   command.CommandType = CommandType.StoredProcedure;

   returnReader = command.ExecuteReader();
   //connection.Close();
   return returnReader;
  }

  /// <summary>
  /// 运行存储过程，创建一个DataSet对象，
  /// 将运行结果存入指定的DataTable中，返回DataSet对象
  /// </summary>
  /// <param name="storedProcName">存储过程名称</param>
  /// <param name="parameters">存储过程的参数对象列表（数组）</param>
  /// <param name="tableName">数据表名称</param>
  /// <returns>DataSet对象</returns>
  public DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )
  {
   DataSet dataSet = new DataSet();
   connection.Open();
   SqlDataAdapter sqlDA = new SqlDataAdapter();
   sqlDA.SelectCommand = BuildQueryCommand( storedProcName, parameters );
   sqlDA.Fill( dataSet, tableName );
   connection.Close();

   return dataSet;
  }

  /// <summary>
  /// 运行存储过程，将运行结果存入已有DataSet对象的指定表中，无返回值
  /// </summary>  
  /// <param name="storedProcName">存储过程名称</param>
  /// <param name="parameters">存储过程的参数对象列表（数组）</param>
  /// <param name="dataSet">DataSet对象</param>
  /// <param name="tableName">数据表名称</param>
  public void RunProcedure(string storedProcName, IDataParameter[] parameters, DataSet dataSet, string tableName )
  {
   connection.Open();
   SqlDataAdapter sqlDA = new SqlDataAdapter();
   sqlDA.SelectCommand = BuildIntCommand( storedProcName, parameters );
   sqlDA.Fill( dataSet, tableName );
   connection.Close();   
  }

  //-----------------------------------------------------------------------------------------
  //以下是自建的（夏春涛）-------------------------------------------------------------------
  //-----------------------------------------------------------------------------------------
  /// <summary>
  /// 运行与写数据库相关的SQL语句，返回影响行数**********************************************
  /// </summary>  
  /// <param name="sqlString">SQL语句</param>
  /// <returns>影响行数</returns>
  public int ExeNonQuery(string sqlString)
  {
   int RowAffected;
   if(connection.State.ToString() == "Closed")
    connection.Open();
   SqlCommand command = new SqlCommand( sqlString, connection );
   RowAffected = command.ExecuteNonQuery();
   //connection.Close();
 
   return RowAffected;

  }

  /// <summary>
  /// 运行SQL语句，返回SqlDataReader对象
  /// </summary>
  /// <param name="sqlString">SQL语句</param>
  /// <returns>SqlDataReader对象</returns>
  public SqlDataReader ExeSqlString(string sqlString)
  {
   SqlDataReader returnReader;

   if(connection.State.ToString() == "Closed")
    connection.Open();
   SqlCommand command = new SqlCommand( sqlString, connection );
   returnReader = command.ExecuteReader();
   //connection.Close();

   return returnReader;
  }

  /// <summary>
  /// 运行SQL语句，返回DataSet对象
  /// </summary>
  /// <param name="string">SQL语句</param>
  /// <param name="tableName">数据表名称</param>
  /// <returns>DataSet对象</returns>
  public DataSet ExeSqlString(string sqlString, string tableName )
  {
   DataSet dataSet = new DataSet();
   if (connection.State.ToString() == "Closed")
                connection.Open();
   SqlDataAdapter sqlDA = new SqlDataAdapter();
   sqlDA.SelectCommand = new SqlCommand( sqlString, connection );
   sqlDA.Fill( dataSet, tableName );
   connection.Close();

   return dataSet;
  }

  /// <summary>
  /// 运行SQL语句，将运行结果存入已有DataSet对象的指定表中，无返回值
  /// </summary>  
  /// <param name="sqlString">SQL语句</param>
  /// <param name="dataSet">DataSet对象</param>
  /// <param name="tableName">数据表名称</param>
  public void ExeSqlString(string sqlString, DataSet dataSet, string tableName )
  {
   if (connection.State.ToString() == "Closed")
    connection.Open();
   SqlDataAdapter sqlDA = new SqlDataAdapter();
   sqlDA.SelectCommand = new SqlCommand( sqlString, connection );
   sqlDA.Fill( dataSet, tableName );
   connection.Close();  
  }

  
  /// <summary>
  /// 运行SQL语句，返回查询结果的第一行的第一列，忽略其它行或列
  /// </summary>  
  /// <param name="sqlString">SQL语句</param>
  /// <returns>影响行数</returns>
  public object ExeScalar(string sqlString)
  {
   object returnScalar;
   if (connection.State.ToString() == "Closed")
    connection.Open();
   SqlCommand command = new SqlCommand( sqlString, connection );
   returnScalar = command.ExecuteScalar();
   //connection.Close();
   
   return returnScalar;
  }
  
  ~DBObject()
  {
   if(connection.State.ToString() == "Open")
                connection.Close();
   connection.Dispose();
  }

 }
}