转一个类

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace EOffice.DBUtility
{
 /// <summary>
 /// 数据访问抽象基础类
 /// Copyright (C) 2004-2008 LiTianPing
 /// All rights reserved 
 /// 也可以去掉static,修改为普通类，通过实例化的构造函数来更换不同的ConnectionString
 /// </summary>
 public class DbHelperSQL
 {
  //数据库连接字符串(web.config来配置)
  //<add key="ConnectionString" value="server=127.0.0.1;database=DATABASE;uid=sa;pwd=" /> 
 
  protected static string connectionString = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];

  public DbHelperSQL()
  {
  }

  #region 公用方法

  public static int GetMaxID(string FieldName,string TableName)
  {
   string strsql = "select max(" + FieldName + ")+1 from " + TableName;
   object obj = DbHelperSQL.GetSingle(strsql);
   if (obj == null)
   {
    return 1;
   }
   else
   {
    return int.Parse(obj.ToString());
   }
  }
  public static bool Exists(string strSql)
  {
   object obj = DbHelperSQL.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 SqlParameter[] cmdParms)
  {
   object obj = DbHelperSQL.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 (SqlConnection connection = new SqlConnection(connectionString))
   {    
    using (SqlCommand cmd = new SqlCommand(SQLString,connection))
    {
     try
     {  
      connection.Open();
      int rows=cmd.ExecuteNonQuery();
      return rows;
     }
     catch(System.Data.SqlClient.SqlException E)
     {     
      connection.Close();
      throw new Exception(E.Message);
     }
    }    
   }
  }

  public static int ExecuteSqlByTime(string SQLString,int Times)
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {    
    using (SqlCommand cmd = new SqlCommand(SQLString,connection))
    {
     try
     {  
      connection.Open();
      cmd.CommandTimeout=Times;
      int rows=cmd.ExecuteNonQuery();
      return rows;
     }
     catch(System.Data.SqlClient.SqlException 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 (SqlConnection conn = new SqlConnection(connectionString))
   {
    conn.Open();
    SqlCommand cmd = new SqlCommand();
    cmd.Connection=conn;    
    SqlTransaction 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.SqlClient.SqlException E)
    {  
     tx.Rollback();
     throw new Exception(E.Message);
    }
   }
  }
  /// <summary>
  /// 执行带一个存储过程参数的的SQL语句。
  /// </summary>
  /// <param name="SQLString">SQL语句</param>
  /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
  /// <returns>影响的记录数</returns>
  public static int ExecuteSql(string SQLString,string content)
  {    
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    SqlCommand cmd = new SqlCommand(SQLString,connection);  
    System.Data.SqlClient.SqlParameter  myParameter = new System.Data.SqlClient.SqlParameter ( "@content", SqlDbType.NText);
    myParameter.Value = content ;
    cmd.Parameters.Add(myParameter);
    try
    {
     connection.Open();
     int rows=cmd.ExecuteNonQuery();
     return rows;
    }
    catch(System.Data.SqlClient.SqlException E)
    {    
     throw new Exception(E.Message);
    }
    finally
    {
     cmd.Dispose();
     connection.Close();
    } 
   }
  }  
  /// <summary>
  /// 执行带一个存储过程参数的的SQL语句。
  /// </summary>
  /// <param name="SQLString">SQL语句</param>
  /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
  /// <returns>影响的记录数</returns>
  public static object ExecuteSqlGet(string SQLString,string content)
  {    
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    SqlCommand cmd = new SqlCommand(SQLString,connection);  
    System.Data.SqlClient.SqlParameter  myParameter = new System.Data.SqlClient.SqlParameter ( "@content", SqlDbType.NText);
    myParameter.Value = content ;
    cmd.Parameters.Add(myParameter);
    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.SqlClient.SqlException E)
    {    
     throw new Exception(E.Message);
    }
    finally
    {
     cmd.Dispose();
     connection.Close();
    } 
   }
  }  
  /// <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 (SqlConnection connection = new SqlConnection(connectionString))
   {
    SqlCommand cmd = new SqlCommand(strSQL,connection); 
    System.Data.SqlClient.SqlParameter  myParameter = new System.Data.SqlClient.SqlParameter ( "@fs", SqlDbType.Image);
    myParameter.Value = fs ;
    cmd.Parameters.Add(myParameter);
    try
    {
     connection.Open();
     int rows=cmd.ExecuteNonQuery();
     return rows;
    }
    catch(System.Data.SqlClient.SqlException 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 (SqlConnection connection = new SqlConnection(connectionString))
   {
    using(SqlCommand cmd = new SqlCommand(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.SqlClient.SqlException e)
     {      
      connection.Close();
      throw new Exception(e.Message);
     } 
    }
   }
  }
  /// <summary>
  /// 执行查询语句，返回SqlDataReader
  /// </summary>
  /// <param name="strSQL">查询语句</param>
  /// <returns>SqlDataReader</returns>
  public static SqlDataReader ExecuteReader(string strSQL)
  {
   SqlConnection connection = new SqlConnection(connectionString);   
   SqlCommand cmd = new SqlCommand(strSQL,connection);    
   try
   {
    connection.Open(); 
    SqlDataReader myReader = cmd.ExecuteReader();
    return myReader;
   }
   catch(System.Data.SqlClient.SqlException e)
   {        
    throw new Exception(e.Message);
   }  
   //   finally
   //   {
   //    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 (SqlConnection connection = new SqlConnection(connectionString))
   {
    DataSet ds = new DataSet();
    try
    {
     connection.Open();     
     SqlDataAdapter command = new SqlDataAdapter(SQLString,connection);      
     command.Fill(ds,"ds");
    }
    catch(System.Data.SqlClient.SqlException ex)
    {    
     throw new Exception(ex.Message);
    }   
    return ds;
   }   
  }
  public static DataSet Query(string SQLString,int Times)
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    DataSet ds = new DataSet();
    try
    {
     connection.Open();     
     SqlDataAdapter command = new SqlDataAdapter(SQLString,connection);  
     command.SelectCommand.CommandTimeout=Times;
     command.Fill(ds,"ds");
    }
    catch(System.Data.SqlClient.SqlException 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 SqlParameter[] cmdParms)
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {    
    using (SqlCommand cmd = new SqlCommand())
    {
     try
     {  
      PrepareCommand(cmd, connection, null,SQLString, cmdParms);
      int rows=cmd.ExecuteNonQuery();
      cmd.Parameters.Clear();
      return rows;
     }
     catch(System.Data.SqlClient.SqlException 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SqlParameter[]）</param>
  public static void ExecuteSqlTran(Hashtable SQLStringList)
  {   
   using (SqlConnection conn = new SqlConnection(connectionString))
   {
    conn.Open();
    using (SqlTransaction trans = conn.BeginTransaction())
    {
     SqlCommand cmd = new SqlCommand();
     try
     {
      //循环
      foreach (DictionaryEntry myDE in SQLStringList)
      { 
       string  cmdText=myDE.Key.ToString();
       SqlParameter[] cmdParms=(SqlParameter[])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 SqlParameter[] cmdParms)
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    using (SqlCommand cmd = new SqlCommand())
    {
     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.SqlClient.SqlException e)
     {    
      throw new Exception(e.Message);
     }     
    }
   }
  }
  
  /// <summary>
  /// 执行查询语句，返回SqlDataReader
  /// </summary>
  /// <param name="strSQL">查询语句</param>
  /// <returns>SqlDataReader</returns>
  public static SqlDataReader ExecuteReader(string SQLString,params SqlParameter[] cmdParms)
  {  
   SqlConnection connection = new SqlConnection(connectionString);
   SqlCommand cmd = new SqlCommand();    
   try
   {
    PrepareCommand(cmd, connection, null,SQLString, cmdParms);
    SqlDataReader myReader = cmd.ExecuteReader();
    cmd.Parameters.Clear();
    return myReader;
   }
   catch(System.Data.SqlClient.SqlException e)
   {        
    throw new Exception(e.Message);
   }  
   //   finally
   //   {
   //    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 SqlParameter[] cmdParms)
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    SqlCommand cmd = new SqlCommand();
    PrepareCommand(cmd, connection, null,SQLString, cmdParms);
    using( SqlDataAdapter da = new SqlDataAdapter(cmd) )
    {
     DataSet ds = new DataSet(); 
     try
     {            
      da.Fill(ds,"ds");
      cmd.Parameters.Clear();
     }
     catch(System.Data.SqlClient.SqlException ex)
     {    
      throw new Exception(ex.Message);
     }   
     return ds;
    }    
   }   
  }

  private static void PrepareCommand(SqlCommand cmd,SqlConnection conn,SqlTransaction trans, string cmdText, SqlParameter[] 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 (SqlParameter 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 存储过程操作

  /// <summary>
  /// 执行存储过程
  /// </summary>
  /// <param name="storedProcName">存储过程名</param>
  /// <param name="parameters">存储过程参数</param>
  /// <returns>SqlDataReader</returns>
  public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters )
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    SqlDataReader returnReader;
    connection.Open();
    SqlCommand command = BuildQueryCommand( connection,storedProcName, parameters );
    command.CommandType = CommandType.StoredProcedure;
    returnReader = command.ExecuteReader();    
    return returnReader;
   }
  }
  
  
  /// <summary>
  /// 执行存储过程
  /// </summary>
  /// <param name="storedProcName">存储过程名</param>
  /// <param name="parameters">存储过程参数</param>
  /// <param name="tableName">DataSet结果中的表名</param>
  /// <returns>DataSet</returns>
  public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName )
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    DataSet dataSet = new DataSet();
    connection.Open();
    SqlDataAdapter sqlDA = new SqlDataAdapter();
    sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );
    sqlDA.Fill( dataSet, tableName );
    connection.Close();
    return dataSet;
   }
  }
  public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName ,int Times)
  {
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    DataSet dataSet = new DataSet();
    connection.Open();
    SqlDataAdapter sqlDA = new SqlDataAdapter();
    sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters );
    sqlDA.SelectCommand.CommandTimeout=Times;
    sqlDA.Fill( dataSet, tableName );
    connection.Close();
    return dataSet;
   }
  }

  
  /// <summary>
  /// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值)
  /// </summary>
  /// <param name="connection">数据库连接</param>
  /// <param name="storedProcName">存储过程名</param>
  /// <param name="parameters">存储过程参数</param>
  /// <returns>SqlCommand</returns>
  private static SqlCommand BuildQueryCommand(SqlConnection connection,string storedProcName, IDataParameter[] parameters)
  {   
   SqlCommand command = new SqlCommand( storedProcName, connection );
   command.CommandType = CommandType.StoredProcedure;
   foreach (SqlParameter parameter in parameters)
   {
    if( parameter != null )
    {
     // 检查未分配值的输出参数,将其分配以DBNull.Value.
     if ( ( parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input ) &&
      (parameter.Value == null))
     {
      parameter.Value = DBNull.Value;
     }
     command.Parameters.Add(parameter);
    }
   }
   
   return command;   
  }
  
  /// <summary>
  /// 执行存储过程，返回影响的行数  
  /// </summary>
  /// <param name="storedProcName">存储过程名</param>
  /// <param name="parameters">存储过程参数</param>
  /// <param name="rowsAffected">影响的行数</param>
  /// <returns></returns>
  public static /*int*/string RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected )
  {
            //string m_connectionString = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];
            using (SqlConnection connection = new SqlConnection(connectionString))
            /*using (SqlConnection connection = new SqlConnection(m_connectionString))*/
   {
                //int result;
    connection.Open();
    SqlCommand command = BuildIntCommand(connection,storedProcName, parameters );
    rowsAffected = command.ExecuteNonQuery();

                //string message = "";
                //for (int i = 0; i < command.Parameters.Count; i++)
                //{
                //    message += command.Parameters[i].Value + "\n";
                //}
                //return message;
                return (string)command.Parameters["ReturnValue"].Value;
    //Connection.Close();
                //return result;
   }
  }
  
  /// <summary>
  /// 创建 SqlCommand 对象实例(用来返回一个整数值) 
  /// </summary>
  /// <param name="storedProcName">存储过程名</param>
  /// <param name="parameters">存储过程参数</param>
  /// <returns>SqlCommand 对象实例</returns>
  private static SqlCommand BuildIntCommand(SqlConnection connection,string storedProcName, IDataParameter[] parameters)
  {
   SqlCommand command = BuildQueryCommand(connection,storedProcName, parameters );
   command.Parameters.Add( new SqlParameter ( "ReturnValue",SqlDbType.Int,4,ParameterDirection.ReturnValue,false,0,0,string.Empty,DataRowVersion.Default,null ));
   return command;
  }
  #endregion 

 }

}