步步為營 .NET三層架構(gòu)解析 三、SQLHelper設計
 
 
文章錄入：7747.Net    責任編輯：7747.Net  29 
 【字體：小 大】
 
數(shù)據(jù)庫設計好了,我們開始設計SQLHelper了,是一個SQL基類.

 連接數(shù)據(jù)源:

    private SqlConnection myConnection = null;
    private readonly string RETURNVALUE = "RETURNVALUE";

打開數(shù)據(jù)庫連接.

 private void Open()
        {
            // 打開數(shù)據(jù)庫連接
            if (myConnection == null)
            {
               //    myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
               myConnection = new SqlConnection(ConfigurationManager.AppSettings["ConnectionString"].ToString());
           
            }
            if (myConnection.State == ConnectionState.Closed)
            {
                try
                {
                    ///打開數(shù)據(jù)庫連接
                    myConnection.Open();
                }
                catch (Exception ex)
                {
                   
                    SystemError.CreateErrorLog(ex.Message);
                }
                finally
                {
                    ///關(guān)閉已經(jīng)打開的數(shù)據(jù)庫連接   
                }
            }
        }

關(guān)閉數(shù)據(jù)庫連接

 public void Close()
        {
            ///判斷連接是否已經(jīng)創(chuàng)建
            if (myConnection != null)
            {
                ///判斷連接的狀態(tài)是否打開
                if (myConnection.State == ConnectionState.Open)
                {
                    myConnection.Close();
                }
            }
        }

釋放資源

        public void Dispose()
        {
            // 確認連接是否已經(jīng)關(guān)閉
            if (myConnection != null)
            {
                myConnection.Dispose();
                myConnection = null;
            }
        }

執(zhí)行無參數(shù)和返回int型的存儲過程

public int RunProc(string procName)
        {
            SqlCommand cmd = CreateProcCommand(procName, null);
            try
            {
                ///執(zhí)行存儲過程
                cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }

            ///返回存儲過程的參數(shù)值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

執(zhí)行傳入?yún)?shù)和返回int型的存儲過程

public int RunProc(string procName, SqlParameter[] prams)
        {
            SqlCommand cmd = CreateProcCommand(procName, prams);
            try
            {
                ///執(zhí)行存儲過程
                cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }

            ///返回存儲過程的參數(shù)值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

 執(zhí)行存儲過程和返回SqlDataReader

        public void RunProc(string procName, out SqlDataReader dataReader)
        {
            ///創(chuàng)建Command
            SqlCommand cmd = CreateProcCommand(procName, null);

            try
            {
                ///讀取數(shù)據(jù)
                dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                dataReader = null;
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
        }

 執(zhí)行傳入?yún)?shù)和返回SqlDataReader存儲過程

public void RunProc(string procName, SqlParameter[] prams, out SqlDataReader dataReader)
        {
            ///創(chuàng)建Command
            SqlCommand cmd = CreateProcCommand(procName, prams);

            try
            {
                ///讀取數(shù)據(jù)
                dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                dataReader = null;
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
        }

執(zhí)行無參數(shù)存儲過程返回DataSet

        public void RunProc(string procName, ref DataSet dataSet)
        {
            if (dataSet == null)
            {
                dataSet = new DataSet();
            }
            ///創(chuàng)建SqlDataAdapter
            SqlDataAdapter da = CreateProcDataAdapter(procName, null);

            try
            {
                ///讀取數(shù)據(jù)
                da.Fill(dataSet);
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }
        }

執(zhí)行傳入?yún)?shù)的存儲過程返回DataSet

 public void RunProc(string procName, SqlParameter[] prams, ref DataSet dataSet)
        {
            if (dataSet == null)
            {
                dataSet = new DataSet();
            }
            ///創(chuàng)建SqlDataAdapter
            SqlDataAdapter da = CreateProcDataAdapter(procName, prams);

            try
            {
                ///讀取數(shù)據(jù)
                da.Fill(dataSet);
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }
        }

執(zhí)行傳入?yún)?shù)和表名的存儲過程返回DataSet

public void RunProc(string procName, SqlParameter[] prams, string TableName, ref DataSet dataSet)
        {
            if (dataSet == null)
            {
                dataSet = new DataSet();
            }
            ///創(chuàng)建SqlDataAdapter
            SqlDataAdapter da = CreateProcDataAdapter(procName, prams);

            try
            {
                ///讀取數(shù)據(jù)
                da.Fill(dataSet, TableName);
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }
        }

執(zhí)行無參數(shù)SQL語句

        public int RunSQL(string cmdText)
        {
            SqlCommand cmd = CreateSQLCommand(cmdText, null);
            try
            {
                ///執(zhí)行存儲過程
                cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }

            ///返回存儲過程的參數(shù)值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

執(zhí)行傳入?yún)?shù)SQL語句

 public int RunSQL(string cmdText, SqlParameter[] prams)
        {
            SqlCommand cmd = CreateSQLCommand(cmdText, prams);
            try
            {
                ///執(zhí)行存儲過程
                cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }

            ///返回存儲過程的參數(shù)值
            return (int)cmd.Parameters[RETURNVALUE].Value;
        }

 執(zhí)行無參數(shù)SQL語句返回SqlDataReader

 public void RunSQL(string cmdText, out SqlDataReader dataReader)
        {
            ///創(chuàng)建Command
            SqlCommand cmd = CreateSQLCommand(cmdText, null);

            try
            {
                ///讀取數(shù)據(jù)
                dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                dataReader = null;
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
        }

執(zhí)行傳入?yún)?shù)SQL語句返回SqlDataReader

        public void RunSQL(string cmdText, SqlParameter[] prams, out SqlDataReader dataReader)
        {
            ///創(chuàng)建Command
            SqlCommand cmd = CreateSQLCommand(cmdText, prams);

            try
            {
                ///讀取數(shù)據(jù)
                dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                dataReader = null;
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
        }

 執(zhí)行無參數(shù)SQL語句返回DataSet

 public void RunSQL(string cmdText, ref DataSet dataSet)
        {
            if (dataSet == null)
            {
                dataSet = new DataSet();
            }
            ///創(chuàng)建SqlDataAdapter
            SqlDataAdapter da = CreateSQLDataAdapter(cmdText, null);

            try
            {
                ///讀取數(shù)據(jù)
                da.Fill(dataSet);
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }
        }

執(zhí)行傳入?yún)?shù)SQL語句返回DataSet

 public void RunSQL(string cmdText, SqlParameter[] prams, ref DataSet dataSet)
        {
            if (dataSet == null)
            {
                dataSet = new DataSet();
            }
            ///創(chuàng)建SqlDataAdapter
            SqlDataAdapter da = CreateProcDataAdapter(cmdText, prams);

            try
            {
                ///讀取數(shù)據(jù)
                da.Fill(dataSet);
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }
        }

執(zhí)行傳入?yún)?shù)SQL語句和表名返回DataSet

 public void RunSQL(string cmdText, SqlParameter[] prams, string TableName, ref DataSet dataSet)
        {
            if (dataSet == null)
            {
                dataSet = new DataSet();
            }
            ///創(chuàng)建SqlDataAdapter
            SqlDataAdapter da = CreateProcDataAdapter(cmdText, prams);

            try
            {
                ///讀取數(shù)據(jù)
                da.Fill(dataSet, TableName);
            }
            catch (Exception ex)
            {
                ///記錄錯誤日志
                SystemError.CreateErrorLog(ex.Message);
            }
            finally
            {
                ///關(guān)閉數(shù)據(jù)庫的連接
                Close();
            }
        }

創(chuàng)建一個SqlCommand對象以此來執(zhí)行存儲過程

 private SqlCommand CreateProcCommand(string procName, SqlParameter[] prams)
        {
            ///打開數(shù)據(jù)庫連接
            Open();

            ///設置Command
            SqlCommand cmd = new SqlCommand(procName, myConnection);
            cmd.CommandType = CommandType.StoredProcedure;

            ///添加把存儲過程的參數(shù)
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                {
                    cmd.Parameters.Add(parameter);
                }
            }

            ///添加返回參數(shù)ReturnValue
            cmd.Parameters.Add(
                new SqlParameter(RETURNVALUE, SqlDbType.Int, 4, ParameterDirection.ReturnValue,
                false, 0, 0, string.Empty, DataRowVersion.Default, null));

            ///返回創(chuàng)建的SqlCommand對象
            return cmd;
        }

創(chuàng)建一個SqlCommand對象以此來執(zhí)行存儲過程

 private SqlCommand CreateSQLCommand(string cmdText, SqlParameter[] prams)
        {
            ///打開數(shù)據(jù)庫連接
            Open();

            ///設置Command
            SqlCommand cmd = new SqlCommand(cmdText, myConnection);

            ///添加把存儲過程的參數(shù)
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                {
                    cmd.Parameters.Add(parameter);
                }
            }

            ///添加返回參數(shù)ReturnValue
            cmd.Parameters.Add(
                new SqlParameter(RETURNVALUE, SqlDbType.Int, 4, ParameterDirection.ReturnValue,
                false, 0, 0, string.Empty, DataRowVersion.Default, null));

            ///返回創(chuàng)建的SqlCommand對象
            return cmd;
        }

創(chuàng)建一個SqlDataAdapter對象,，用此來執(zhí)行存儲過程

private SqlDataAdapter CreateProcDataAdapter(string procName, SqlParameter[] prams)
        {
            ///打開數(shù)據(jù)庫連接
            Open();

            ///設置SqlDataAdapter對象
            SqlDataAdapter da = new SqlDataAdapter(procName, myConnection);
            da.SelectCommand.CommandType = CommandType.StoredProcedure;

            ///添加把存儲過程的參數(shù)
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                {
                    da.SelectCommand.Parameters.Add(parameter);
                }
            }

            ///添加返回參數(shù)ReturnValue
            da.SelectCommand.Parameters.Add(
                new SqlParameter(RETURNVALUE, SqlDbType.Int, 4, ParameterDirection.ReturnValue,
                false, 0, 0, string.Empty, DataRowVersion.Default, null));

            ///返回創(chuàng)建的SqlDataAdapter對象
            return da;
        }

創(chuàng)建一個SqlDataAdapter對象，用此來執(zhí)行SQL語句

private SqlDataAdapter CreateSQLDataAdapter(string cmdText, SqlParameter[] prams)
        {
            ///打開數(shù)據(jù)庫連接
            Open();

            ///設置SqlDataAdapter對象
            SqlDataAdapter da = new SqlDataAdapter(cmdText, myConnection);

            ///添加把存儲過程的參數(shù)
            if (prams != null)
            {
                foreach (SqlParameter parameter in prams)
                {
                    da.SelectCommand.Parameters.Add(parameter);
                }
            }

            ///添加返回參數(shù)ReturnValue
            da.SelectCommand.Parameters.Add(
                new SqlParameter(RETURNVALUE, SqlDbType.Int, 4, ParameterDirection.ReturnValue,
                false, 0, 0, string.Empty, DataRowVersion.Default, null));

            ///返回創(chuàng)建的SqlDataAdapter對象
            return da;
        }

生成存儲過程參數(shù)

 public SqlParameter CreateParam(string ParamName, SqlDbType DbType, Int32 Size, ParameterDirection Direction, object Value)
        {
            SqlParameter param;

            ///當參數(shù)大小為0時,，不使用該參數(shù)大小值
            if (Size > 0)
            {
                param = new SqlParameter(ParamName, DbType, Size);
            }
            else
            {
                ///當參數(shù)大小為0時,，不使用該參數(shù)大小值
                param = new SqlParameter(ParamName, DbType);
            }

            ///創(chuàng)建輸出類型的參數(shù)
            param.Direction = Direction;
            if (!(Direction == ParameterDirection.Output && Value == null))
            {
                param.Value = Value;
            }

            ///返回創(chuàng)建的參數(shù)
            return param;
        }

傳入輸入?yún)?shù)

        public SqlParameter CreateInParam(string ParamName, SqlDbType DbType, int Size, object Value)
        {
            return CreateParam(ParamName, DbType, Size, ParameterDirection.Input, Value);
        }

傳入返回值參數(shù)

        public SqlParameter CreateOutParam(string ParamName, SqlDbType DbType, int Size)
        {
            return CreateParam(ParamName, DbType, Size, ParameterDirection.Output, null);
        }

傳入返回值參數(shù)

        public SqlParameter CreateReturnParam(string ParamName, SqlDbType DbType, int Size)
        {
            return CreateParam(ParamName, DbType, Size, ParameterDirection.ReturnValue, null);
        }

把所有這些方法放在SQLHelper.cs類里.再建一個SQLTools.cs,里面的方法如下:

 public class SystemException : Exception
    {
        /// <summary>
        /// 包含系統(tǒng)Excepton
        /// </summary>
        public SystemException(string source, string message, Exception inner)
            : base(message, inner)
        {
            base.Source = source;
        }

        /// <summary>
        /// 不包含系統(tǒng)Excepton
        /// </summary>  
        public SystemException(string source, string message)
            : base(message)
        {
            base.Source = source;
        }
    }

    /// <summary>
    /// 處理網(wǎng)頁中的HTML代碼，并消除危險字符
    /// </summary>
    public class SystemHTML
    {
        private static string HTMLEncode(string fString)
        {
            if (fString != string.Empty)
            {
                ///替換尖括號
                fString.Replace("<", "<");
                fString.Replace(">", "&rt;");
                ///替換引號
                fString.Replace(((char)34).ToString(), """);
                fString.Replace(((char)39).ToString(), "'");
                ///替換空格
                fString.Replace(((char)13).ToString(), "");
                ///替換換行符
                fString.Replace(((char)10).ToString(), "<BR> ");
            }
            return (fString);
        }
    }

    /// <summary>
    /// SystemTools 的摘要說明,。
    /// </summary>
    public class SystemTools
    {
        /// <summary>
        /// 將DataReader轉(zhuǎn)為DataTable
        /// </summary>
        /// <param name="DataReader">DataReader</param>
        public static DataTable ConvertDataReaderToDataTable(SqlDataReader dataReader)
        {
            ///定義DataTable
            DataTable datatable = new DataTable();

            try
            { ///動態(tài)添加表的數(shù)據(jù)列
                for (int i = 0; i < dataReader.FieldCount; i++)
                {
                    DataColumn myDataColumn = new DataColumn();
                    myDataColumn.DataType = dataReader.GetFieldType(i);
                    myDataColumn.ColumnName = dataReader.GetName(i);
                    datatable.Columns.Add(myDataColumn);
                }

                ///添加表的數(shù)據(jù)
                while (dataReader.Read())
                {
                    DataRow myDataRow = datatable.NewRow();
                    for (int i = 0; i < dataReader.FieldCount; i++)
                    {
                        myDataRow[i] = dataReader[i].ToString();
                    }
                    datatable.Rows.Add(myDataRow);
                    myDataRow = null;
                }
                ///關(guān)閉數(shù)據(jù)讀取器
                dataReader.Close();
                return datatable;
            }
            catch (Exception ex)
            {
                ///拋出類型轉(zhuǎn)換錯誤
                SystemError.CreateErrorLog(ex.Message);
                throw new Exception(ex.Message, ex);
            }
        }
    }

主要是處理異常和一些特殊字符.

再建一個SystemError.cs,里面的方法如下:

    public class SystemError
    {
        private static string m_fileName = "c:\\Systemlog.txt";

        public static String FileName
        {
            get
            {
                return (m_fileName);
            }
            set
            {
                if (value != null || value != "")
                {
                    m_fileName = value;
                }
            }
        }
        public static void CreateErrorLog(string message)
        {
            if (File.Exists(m_fileName))
            {
                ///如果日志文件已經(jīng)存在,，則直接寫入日志文件
                StreamWriter sr = File.AppendText(FileName);
                sr.WriteLine("\n");
                sr.WriteLine(DateTime.Now.ToString() + message);
                sr.Close();
            }
            else
            {
                ///創(chuàng)建日志文件
                StreamWriter sr = File.CreateText(FileName);
                sr.Close();
            }
        }
    }

主要記錄日志.

我們的SQLHelper類就建完了,接下來我們就開始建Model類了.歡迎拍磚
 

摘自紅色黑客聯(lián)盟(www.) 原文：http://www./kf/201103/86546.html