自用SqlHelper

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


class SqlHelper
{

    private SqlConnection Connection;

    private SqlCommand Command;

    /// <summary> 
    /// 创建一个数据库连接并打开该连接
    /// </summary> 
    /// <param name="connStr">连接字符串</param>
    public SqlHelper( string connStr)
    {
        Connection = new SqlConnection(connStr);
        Open();
    }


    /// <summary> 
    /// 打开数据库连接 
    /// </summary> 
    public void Open()
    {
        if (Connection.State != ConnectionState.Open)
            Connection.Open();
    }

    /// <summary> 
    /// 关闭数据库连接 
    /// </summary> 
    public void Close()
    {
        if (Connection.State != ConnectionState.Closed)
            Connection.Close();
    }

    /// <summary> 
    /// 执行带参数的sql语句（插入、删除、修改）,返回执行T-SQL后受影响行数 
    /// </summary> 
    /// <param name="para">SQL参数，如没有则填null</param> 
    /// <param name="cmdText">SQL语句</param> 
    /// <returns>返回受影响的行数</returns> 
    public int UpData(string cmdText, params SqlParameter[] para)
    {

        Command = new SqlCommand(cmdText, Connection);
        if (para != null)
        {
           foreach (SqlParameter p in para)
            {
                Command.Parameters.Add(p);
            }
        }
        return Command.ExecuteNonQuery();
    }

    /// <summary> 
    /// 执行带参数的sql语句（select语句），返回SqlDataReader数据流 
    /// </summary> 
    /// <param name="cmdText">SQL语句</param> 
    /// <param name="para">SqlParameter,如没有则填null</param> 
    public SqlDataReader GetDataReader(string cmdText, params SqlParameter[] para)
    {
        Command = new SqlCommand(cmdText, Connection);
        if (para != null)
        {
            foreach (SqlParameter p in para)
            {
                Command.Parameters.Add(p);
            }
        }
        return Command.ExecuteReader(CommandBehavior.CloseConnection);
    }

    /// <summary> 
    /// 执行带参数的sql语句（select语句），返回DataSet 
    /// </summary> 
    /// <param name="cmdText">SQL语句</param> 
    /// <param name="para">参数列表，如果没有填null</param> 
    public DataSet GetDataSet(string cmdText,params SqlParameter[] para)
    {
        Command = new SqlCommand(cmdText, Connection);
        if (para != null)
        {
            foreach (SqlParameter p in para)
            {
                Command.Parameters.Add(p);
            }

        }

        SqlDataAdapter da = new SqlDataAdapter();
        DataSet ds = new DataSet();
        da.SelectCommand = Command;
        da.Fill(ds);
        return ds;
    }
}

其实这个SqlHelper在现在看来用处已经不算太大了,因为最近换了工作,公司主要使用oracle.下次再更新个通用版的吧,最近也学到不少新知识,包括架构方面的学习.