public abstract class DbObject
{
    protected SqlConnection Connection;
    private string connectionString;
    //定义两个构造函数
       public DbObject()
        {}
        public DbObject(string connString)
        {
            connectionString =connString;
            Connection = new SqlConnection(ConnectionString);
        }
        protected string ConnectionString
        {
            get {return connectionString;}
        }
    //根据指定的存储过程名称和参数生成对应的SQL命令对象。
        private SqlCommand BuilQueryCommand(string storedName,SqlParameter[] parameters)
            {
                SqlCommand command = new SqlCommand();
                command.Connection = this.Connection;
                command.CommandText ="["+storedName.Trim()+"]";
                command.CommandType = CommandType.StoredProcedure;
                if(parameters!=null)
                {
                        foreach(SqlParameter p in parameters)
                            command.parameters.add(p);
                }
                return command;
            }
    //执行不返回结果的存储过程
    protected int RunProcedure(string storedProcName,SqlParameter[] parameters,out int rowsAffected)
{
    int result;
    SqlCommand cmd = BuildQueryCommand(storedProcName,parameters);
    cmd.parameters.add(
    new SqlParameter(
    "@RETURN_VALUE", //参数名
    SqlDbType.Int, //参数类型
    4, //参数长度
    ParameterDirection.ReturnValue,//参数方向
    false,//是否可以为空
    ((system.byte)(0)),//精度
     ((system.byte)(0)),//小数位数
       "",//源列的名称
        DataRowVersion.Current,//行版本
        null//参数值。
    ));
     Connection.open();
    rowsAffected = cmd.ExecuteNonQuery();
    result =(int)(cmd.Parameters["@Return_value"].value);
    Connection.close();
    return result;
}
//执行返回结果的存储过程，最后返回一个sqldatareader对象.
protected SqlDataReader RunProcedure(string storedProcName,SqlParameter[] parameters)
{
    SqlDataReader reader;
    SqlCommand cmd=BuildQueryCommand(storedProcName,parameters);
    Connection.open();
    reader=cmd.ExecuteReader(CommandBehavior.closeConnection);
    return reader;
}

}