.NET：一个非常好用的SQL数据库处理类

using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Runtime.Remoting.Messaging;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Text;


public abstract class DBUtility
 {
  //数据库连接字符串
  protected static string connectionstring =  ConfigurationSettings.AppSettings["conStr"];

  public static string conStr
  {
      get
      {
          return connectionstring;
      }
  }

  public DBUtility()
  {
   //
   // todo: 在此处添加构造函数逻辑
   //
  }

  /// <summary>
  /// 执行sql语句，返回影响的记录数
  /// </summary>
  /// <param name="sqlstring"></param>
  /// <returns></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)
     {    
        throw new Exception(e.Message);
     }
    }    
   }
  }
  /// <summary>
  /// 执行两条sql语句，实现数据库事务。
  /// </summary>
  /// <param name="sqlstring1"></param>
  /// <param name="sqlstring2"></param>
  public static void ExecuteSqlTran(string sqlstring1,string sqlstring2)
  {
   using (SqlConnection connection = new SqlConnection(connectionstring))
   {
    connection.Open();
    SqlCommand cmd = new SqlCommand();
    cmd.Connection=connection;    
    SqlTransaction tx=connection.BeginTransaction();   
    cmd.Transaction=tx;    
    try
    {     
     cmd.CommandText=sqlstring1;
     cmd.ExecuteNonQuery();
     cmd.CommandText=sqlstring2;
     cmd.ExecuteNonQuery();     
     tx.Commit();     
    }
    catch(System.Data.SqlClient.SqlException e)
    {  
     tx.Rollback();
     throw new Exception(e.Message);
    }
    finally
    {
     cmd.Dispose();
     connection.Close();
    } 
   }
  } 
  /// <summary>
  /// 执行多条sql语句，实现数据库事务，每条语句以“;”分割。
  /// </summary>
  /// <param name="sqlstringlist"></param>
  public static void ExecuteSqlTran(string sqlstringlist)
  {
   using (SqlConnection conn = new SqlConnection(connectionstring))
   {

    conn.Open();
    SqlCommand cmd = new SqlCommand();
    cmd.Connection=conn;    
    SqlTransaction tr =conn.BeginTransaction();   
    cmd.Transaction=tr;    
    try
    {   
     string [] split= sqlstringlist.Split(new char [] {‘;‘});
     foreach (string strsql in split) 
     {
      if (strsql.Trim()!="")
      {
       cmd.CommandText=strsql;
       cmd.ExecuteNonQuery();
      }
     }       
     tr.Commit();     
    }
    catch(System.Data.SqlClient.SqlException e)
    {  
     tr.Rollback();
     throw new Exception(e.Message);
    }
   }
  }
   /// <summary>
  /// 向数据库里插入图像格式的字段
  /// </summary>
  /// <param name="strsql"></param>
  /// <param name="fs"></param>
  /// <returns></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（整数）。
  /// </summary>
  /// <param name="strsql"></param>
  /// <returns></returns>
  public static int GetCount(string strsql)
  {
   using (SqlConnection connection = new SqlConnection(connectionstring))
   {
    SqlCommand cmd = new SqlCommand(strsql,connection);    
    try
    {
     connection.Open();
     SqlDataReader result = cmd.ExecuteReader();
     int i=0;
     while(result.Read())
     {
      i=result.GetInt32(0);
     }
     result.Close();    
     return i;
    }
    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"></param>
  /// <returns></returns>
  public static object GetSingleObj(string sqlstring)
  {
   using (SqlConnection connection = new SqlConnection(connectionstring))
   {
    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)
    {    
     throw new Exception(e.Message);
    }
    finally
    {
     cmd.Dispose();
     connection.Close();
    }
   }
  }
  /// <summary>
  /// 执行查询语句，返回SqlDataReader
  /// </summary>
  /// <param name="strsql"></param>
  /// <returns></returns>
  public static SqlDataReader ExecuteReader(string strsql)
  {
      SqlConnection connection = new SqlConnection(connectionstring);
   {
    SqlCommand cmd = new SqlCommand(strsql,connection); 
    SqlDataReader myreader;   
    try
    {
     connection.Open(); 
     myreader = cmd.ExecuteReader();
     return myreader;
    }
    catch(System.Data.SqlClient.SqlException e)
    {        
     throw new Exception(e.Message);
    }  
    //finally
    //{
    // cmd.Dispose();
    // connection.Close();
    //} 
   }
  }


  public static SqlDataReader ExecuteReader(string strsql, IDataParameter[] parameters)
  {
      SqlConnection connection = new SqlConnection(connectionstring);
      {
          SqlCommand cmd = new SqlCommand(strsql, connection);
          cmd.Parameters.AddRange(parameters);
          SqlDataReader myreader;
          try
          {
              connection.Open();
              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"></param>
  /// <returns></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;
   }
   
  }

    


  #region 存储过程操作

  /// <summary>
  /// 运行存储过程
  /// </summary>
  /// <param name="storedprocname"></param>
  /// <param name="parameters"></param>
  /// <returns></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();
    //connection.Close();
    return returnreader;
   }
  }


  public static SqlDataReader RunProcedure(string storedprocname)
  {
      using (SqlConnection connection = new SqlConnection(connectionstring))
      {
          SqlDataReader returnreader;
          connection.Open();
          SqlCommand command = new SqlCommand(storedprocname, connection);
          command.CommandType = CommandType.StoredProcedure;

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



  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 int GetProcedureReturnValue(string storedprocname, IDataParameter[] parameters)
  {
      using (SqlConnection connection = new SqlConnection(connectionstring))
      {
          connection.Open();
          SqlCommand command = BuildQueryCommand(connection, storedprocname, parameters);
          SqlParameter rtnval = command.Parameters.Add("rval", SqlDbType.Int);
          rtnval.Direction = ParameterDirection.ReturnValue;

          command.ExecuteNonQuery();
          return (int)rtnval.Value;
      }
  }


    public static string GetProcedureOutputValue(string storedprocname, IDataParameter[] parameters, string outputParaName)
    {
        using (SqlConnection connection = new SqlConnection(connectionstring))
        {
            connection.Open();
            SqlCommand command = BuildQueryCommand(connection, storedprocname, parameters);
            SqlParameter rtnval = command.Parameters.Add(outputParaName, SqlDbType.VarChar, 500);
            rtnval.Direction = ParameterDirection.Output;

            command.ExecuteNonQuery();
            return rtnval.Value.ToString();
        }
    }

   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)
      {
          command.Parameters.Add(parameter);
      }
      return command;

  }  

  #endregion 

    

 }

.NET：一个非常好用的SQL数据库处理类,古老的榕树,5-wow.com