SqlHelper 数据库操作类

sqlHelper.cs

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

namespace lsb.DBUtility
{
    /// <summary>
    /// SQL Server 数据库操作类
    /// </summary>
    public class SqlHelper : lsb.DBtility.IDBHelper
    {
        private string ConnectionString;

        private SqlConnection conn;
        private SqlDataAdapter da;
        private SqlCommand cmd;

        public bool GetConnectionString(ref string ErrMsg)
        {
            ConnectionString = "Data Source=.;Initial Catalog=Hotel;Integrated Security=True";
            return true;
        }

        public bool Open(ref string ErrMsg)
        {
            try
            {
                conn = new SqlConnection();
                if ((conn.State == ConnectionState.Broken) || (conn.State == ConnectionState.Closed))
                {
                    if (!GetConnectionString(ref ErrMsg))
                    {
                        return false;
                    }
                    conn.ConnectionString = ConnectionString;
                    conn.Open();
                    return true;
                }
                return false;
            }
            catch (SqlException ex)
            {
                this.SetErrMsg(ex, ref ErrMsg);
                return false;
            }
        }

        public bool Close(ref string ErrMsg)
        {
            try
            {
                if ((conn.State != ConnectionState.Broken) && (conn.State != ConnectionState.Closed))
                {
                    conn.Close();
                    return true;
                }
                return false;
            }
            catch (SqlException ex)
            {
                this.SetErrMsg(ex, ref ErrMsg);
                return false;
            }
        }

        public bool ExceuteNonQuery(string sql, ref string ErrMsg)
        {
            throw new System.NotImplementedException();
        }

        public bool GetDataSet(string sql, ref DataSet ds, ref string ErrMsg)
        {
            throw new System.NotImplementedException();
        }

        private bool SetErrMsg(SqlException ex, ref string ErrMsg)
        {
            ErrMsg = ex.Message;
            return true;
        }

    }
}

IDBHelper.cs

using System;
using System.Data;

namespace lsb.DBtility
{
    public interface IDBHelper
    {
        /// <summary>
        /// 取得数据库连接字符串
        /// </summary>
        /// <returns></returns>
        bool GetConnectionString(ref string ErrMsg);

        /// <summary>
        /// 打开数据库连接
        /// </summary>
        bool Open(ref string ErrMsg);

        /// <summary>
        /// 关闭数据库连接
        /// </summary>
        bool Close(ref string ErrMsg);

        /// <summary>
        /// 执行 SQL 语句 无返回结果
        /// </summary>
        bool ExceuteNonQuery(string sql, ref string ErrMsg);

        /// <summary>
        /// 取得DataSet数据集
        /// </summary>
        bool GetDataSet(string sql, ref DataSet ds, ref string ErrMsg);

    }
}

不知道这样写好不好， 心里还没有数 ~~

上面的方法中要不要用 ref stirng ErrMsg 呢？

还是把上面的方法改为静态方法?