ASP.NET 一个数据访问层的封装

CREATE PROCEDURE [dbo].[P_Pagination] 
    @tblName varchar(5000), -- 表名
    @strGetFields varchar(1000) = ‘*‘, -- 需要返回的列
    @strWhere varchar(1500) = ‘‘, -- 查询条件(注意: 不要加 where)
    @OrderSql varchar(255) = ‘‘, -- 排序语句(注意: 不要加 order by)
    @PageSize int = 0, -- 页尺寸
    @PageIndex int = 1, -- 页码
    @doCount bit = 0 -- 返回记录总数,非 0 值则返回
AS
BEGIN
    declare @strSQL varchar(5000) -- 主语句

    if @doCount <> 0
    begin
        if @strWhere <> ‘‘
            set @strSQL = ‘select count(*) as Total from ‘ + @tblName + ‘ where ‘ + @strWhere
        else
            set @strSQL = ‘select count(*) as Total from ‘ + @tblName + ‘‘
    end
    --以上代码的意思是如果@doCount传递过来的不是0，就执行总数统计。以下的所有代码都是@doCount为0的情况
    else
    begin
        if @PageSize = 0 --返回所有记录集
        begin
            if @strWhere <> ‘‘
                set @strSQL = ‘select ‘ + @strGetFields + ‘ from ‘ + @tblName + ‘ where ‘ + @strWhere + ‘ order by ‘ + @OrderSql
            else
                set @strSQL = ‘select ‘ + @strGetFields + ‘ from ‘ + @tblName + ‘ order by ‘ + @OrderSql
        end
        else 
        begin
            if @PageIndex = 1
            begin
                if @strWhere <> ‘‘
                    set @strSQL = ‘select top ‘ + str(@PageSize) + ‘ ‘ + @strGetFields + ‘ from ‘ + @tblName + ‘ where ‘ + @strWhere + ‘ order by ‘ + @OrderSql
                else
                    set @strSQL = ‘select top ‘ + str(@PageSize) + ‘ ‘ + @strGetFields + ‘ from ‘ + @tblName + ‘ order by ‘ + @OrderSql
                --如果是第一页就执行以上代码，这样会加快执行速度
            end
            else
            begin
                --以下代码赋予了@strSQL以真正执行的SQL代码
                if @strWhere = ‘‘
                    set @strSQL = ‘select top ‘ + str(@PageSize) + ‘ tblTmp.* from ‘
                        + ‘(select ROW_NUMBER() OVER(order by ‘ + @OrderSql + ‘) AS RowNum,‘ + @strGetFields + ‘ from ‘ + @tblName + ‘) tblTmp where tblTmp.[RowNum] > ‘
                            + ‘(select max([RowNum]) from ‘
                                + ‘(select top ‘ + str((@PageIndex - 1) * @PageSize) + ‘ ROW_NUMBER() OVER(order by ‘ + @OrderSql + ‘) AS RowNum from ‘ + @tblName + ‘) as tblTmp1)‘
                else
                    set @strSQL = ‘select top ‘ + str(@PageSize) + ‘ tblTmp.* from ‘
                        + ‘(select ROW_NUMBER() OVER(order by ‘ + @OrderSql + ‘) AS RowNum,‘ + @strGetFields + ‘ from ‘ + @tblName + ‘ where ‘ + @strWhere + ‘) tblTmp where tblTmp.[RowNum] > ‘
                            + ‘(select max([RowNum]) from ‘
                                + ‘(select top ‘ + str((@PageIndex - 1) * @PageSize) + ‘ ROW_NUMBER() OVER(order by ‘ + @OrderSql + ‘) AS RowNum from ‘ + @tblName + ‘ where ‘ + @strWhere + ‘) as tblTmp1)‘
            end
        end
    end
    exec (@strSQL);
END

namespace Ant.DAL
{
    /// <summary>
    /// 存储过程返回值
    /// </summary>
    public class ProcResultValue
    {
        /// <summary>
        /// @Result 字符串返回值
        /// </summary>
        public string ResultValueStr { get; set; }

        /// <summary>
        /// Return 任意类型返回值
        /// </summary>
        public int ReturnValueInt { get; set; }

        /// <summary>
        /// 存储过程异常实体信息返回
        /// </summary>
        public string ReturnValue
        {
            get
            {
                if (ReturnValueInt <= 0)
                    return ResultValueStr;
                else
                    return "";
            }
        }
    }

    /// <summary>
    /// 数据库基础操作类
    /// </summary>
    public class Database
    {
        // 测试用Sql连接字符串
        private static string SqlConn_Debug = System.Configuration.ConfigurationManager.ConnectionStrings["ConnDB"].ToString();/// <summary>
        /// 数据库基础操作类 构造函数
        /// </summary>
        public Database()
        {
        }

        /// <summary>
        /// 获得数据库连接数据
        /// </summary>
        /// <returns>数据库连接信息</returns>
        protected SqlConnection GetConn()
        {
            SqlConnection ConnDB = new SqlConnection(SqlConn_Debug);
            ConnDB.StateChange += new StateChangeEventHandler(ConnDB_StateChange);
            ConnDB.Open();
            return ConnDB;
        }

        /// <summary>
        /// 数据库链接状态改变事件
        /// </summary>
        protected void ConnDB_StateChange(object sender, StateChangeEventArgs e)
        {
            if (e.CurrentState == ConnectionState.Closed)
            {
                ((SqlConnection)sender).Dispose(); // 释放资源
                GC.Collect(); // 释放资源
            }
        }

        /// <summary>
        /// 获得对应表序列的新ID
        /// </summary>
        /// <param name="TableName">表名</param>
        /// <param name="TableCol">表ID列名</param>
        /// <param name="TableWhere">查询条件(注意：不添加‘where‘)</param>
        /// <returns>返回：序列的新ID</returns>
        protected int GetSequence(string TableName, string TableCol, string tableWhere = "")
        {
            DataParameters DP = new DataParameters();
            DP.Add("@TableName", SqlDbType.VarChar, TableName);
            DP.Add("@TableCol", SqlDbType.VarChar, TableCol);
            DP.Add("@tableWhere", SqlDbType.VarChar, tableWhere);
            return ExeProc("P_Sequence", DP, false).ReturnValueInt;
        }

        /// <summary>
        /// 通过存储过程，获得数据集 DataReader
        /// </summary>
        /// <param name="tblName">要查询的表名</param>
        /// <param name="strGetFields">要查询的字段</param>
        /// <param name="strWhere">查询条件（注意：不要加 "where"）</param>
        /// <param name="OrderSql">排序规则（注意：不要加 "order by"，且不能为空）</param>
        /// <param name="PageSize">页大小 为0时，则不分页</param>
        /// <param name="PageIndex">页索引</param>
        /// <returns>返回：记录集 SqlDataReader</returns>
        protected SqlDataReader GetDataReader(string tblName, string strGetFields, string strWhere, string OrderSql, int PageSize, int PageIndex)
        {
            SqlCommand Cmd = new SqlCommand("P_Pagination", GetConn());
            Cmd.CommandType = CommandType.StoredProcedure;
            Cmd.Parameters.Add("@tblName", SqlDbType.VarChar).Value = tblName;
            Cmd.Parameters.Add("@strGetFields", SqlDbType.VarChar).Value = strGetFields;
            Cmd.Parameters.Add("@strWhere", SqlDbType.VarChar).Value = strWhere;
            Cmd.Parameters.Add("@OrderSql", SqlDbType.VarChar).Value = OrderSql;
            Cmd.Parameters.Add("@PageSize", SqlDbType.Int).Value = PageSize;
            Cmd.Parameters.Add("@PageIndex", SqlDbType.Int).Value = PageIndex;
            Cmd.Parameters.Add("@doCount", SqlDbType.Bit).Value = false;
            return Cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }

        /// <summary>
        /// 通过存储过程及自定义参数，获得数据集 DataReader
        /// </summary>
        /// <param name="ProcName">存储过程名</param>
        /// <param name="DataParas">存储过程参数集</param>
        /// <returns>返回：记录集 SqlDataReader</returns>
        protected SqlDataReader GetDataReader(string ProcName, DataParameters DataParas)
        {
            SqlCommand Cmd = new SqlCommand(ProcName, GetConn());
            Cmd.CommandType = CommandType.StoredProcedure;

            // 遍历 存储过程参数集
            foreach (System.Collections.DictionaryEntry obj in DataParas.Parameters)
            {
                Cmd.Parameters.Add(obj.Key.ToString(), (SqlDbType)((object[])obj.Value)[0]).Value = ((object[])obj.Value)[1];
            }
            return Cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }

        /// <summary>
        /// 通过存储过程，获得数据集 DataTable
        /// </summary>
        /// <param name="tblName">要查询的表名</param>
        /// <param name="strGetFields">要查询的字段</param>
        /// <param name="strWhere">查询条件（注意：不要加 "where"）</param>
        /// <param name="OrderSql">排序规则（注意：不要加 "order by"，且不能为空）</param>
        /// <param name="PageSize">页大小 为0时，则不分页</param>
        /// <param name="PageIndex">页索引</param>
        /// <returns>返回：记录集 DataTable</returns>
        protected DataTable GetDataTable(string tblName, string strGetFields, string strWhere, string OrderSql, int PageSize, int PageIndex)
        {
            SqlCommand Cmd = new SqlCommand("P_Pagination", GetConn());
            Cmd.CommandType = CommandType.StoredProcedure;
            Cmd.Parameters.Add("@tblName", SqlDbType.VarChar).Value = tblName;
            Cmd.Parameters.Add("@strGetFields", SqlDbType.VarChar).Value = strGetFields;
            Cmd.Parameters.Add("@strWhere", SqlDbType.VarChar).Value = strWhere;
            Cmd.Parameters.Add("@OrderSql", SqlDbType.VarChar).Value = OrderSql;
            Cmd.Parameters.Add("@PageSize", SqlDbType.Int).Value = PageSize;
            Cmd.Parameters.Add("@PageIndex", SqlDbType.Int).Value = PageIndex;
            Cmd.Parameters.Add("@doCount", SqlDbType.Bit).Value = false;
            SqlDataAdapter DA = new SqlDataAdapter(Cmd);
            DataTable DT = new DataTable();
            DA.Fill(DT);
            Cmd.Connection.Close();
            return DT;
        }

        /// <summary>
        /// 通过指定的存储过程名称，获取数据集 DataTable
        /// </summary>
        /// <param name="ProcName">存储过程名</param>
        /// <param name="DataParas">存储过程参数集</param>
        /// <returns>返回：记录集 DataTable</returns>
        protected DataTable GetDataTable(string ProcName, DataParameters DataParas = null)
        {
            SqlCommand Cmd = new SqlCommand(ProcName, GetConn());
            Cmd.CommandType = CommandType.StoredProcedure;

            // 遍历 存储过程参数集
            if(DataParas != null)
            {
                foreach (System.Collections.DictionaryEntry obj in DataParas.Parameters)
                {
                    Cmd.Parameters.Add(obj.Key.ToString(), (SqlDbType)((object[])obj.Value)[0]).Value = ((object[])obj.Value)[1];
                }
            }
            SqlDataAdapter DA = new SqlDataAdapter(Cmd);
            DataTable DT = new DataTable();
            DA.Fill(DT);
            Cmd.Connection.Close();
            return DT;
        }

        /// <summary>
        /// 执行SQL查询语句，获取数据集 DataReader
        /// </summary>
        /// <param name="sqlTxt">要执行的SQL语句</param>
        /// <returns>返回：记录集 DataReader</returns>
        protected SqlDataReader GetDataReader(string sqlTxt)
        {
            SqlCommand Cmd = new SqlCommand(sqlTxt, GetConn());
            Cmd.CommandType = CommandType.Text;
            return Cmd.ExecuteReader(CommandBehavior.CloseConnection);
        }

        /// <summary>
        /// 执行SQL查询语句，获取数据集 DataTable
        /// </summary>
        /// <param name="sqlTxt">要执行的SQL语句</param>
        /// <returns>返回：记录集 DataTable</returns>
        protected DataTable GetDataTable(string sqlTxt)
        {
            SqlCommand Cmd = new SqlCommand(sqlTxt, GetConn());
            Cmd.CommandType = CommandType.Text;
            SqlDataAdapter DA = new SqlDataAdapter(Cmd);
            DataTable DT = new DataTable();
            DA.Fill(DT);
            Cmd.Connection.Close();
            return DT;
        }

        /// <summary>
        /// 通过存储过程，获得数据集 总数
        /// </summary>
        /// <param name="tblName">要查询的表名</param>
        /// <param name="strWhere">查询条件</param>
        /// <returns>返回：记录集数量</returns>
        protected int GetDataCount(string tblName, string strWhere = "")
        {
            SqlCommand Cmd = new SqlCommand("P_Pagination", GetConn());
            Cmd.CommandType = CommandType.StoredProcedure;
            Cmd.Parameters.Add("@tblName", SqlDbType.VarChar).Value = tblName;
            Cmd.Parameters.Add("@strGetFields", SqlDbType.VarChar).Value = "*";
            Cmd.Parameters.Add("@strWhere", SqlDbType.VarChar).Value = strWhere;
            Cmd.Parameters.Add("@OrderSql", SqlDbType.VarChar).Value = "";
            Cmd.Parameters.Add("@PageSize", SqlDbType.Int).Value = 0;
            Cmd.Parameters.Add("@PageIndex", SqlDbType.Int).Value = 1;
            Cmd.Parameters.Add("@doCount", SqlDbType.Bit).Value = true;
            int Result = (int)Cmd.ExecuteScalar();
            Cmd.Connection.Close();
            return Result;
        }

        /// <summary>
        /// 执行SQL查询语句，并返回数据集长度
        /// </summary>
        /// <param name="sqlTxt">要执行的SQL语句</param>
        /// <returns>返回:数据集长度</returns>
        protected int GetDataCount(string sqlTxt)
        {
            SqlCommand Cmd = new SqlCommand(sqlTxt, GetConn());
            Cmd.CommandType = CommandType.Text;
            SqlDataAdapter DA = new SqlDataAdapter(Cmd);
            DataTable DT = new DataTable();
            DA.Fill(DT);
            Cmd.Connection.Close();
            return DT.Rows.Count;
        }

        /// <summary>
        /// 执行查询语句，并返回第一行第一列数据
        /// </summary>
        /// <param name="SelectTxt">要执行的查询语句</param>
        /// <returns>返回查询结果集的第一行第一列数据</returns>
        protected object GetOnlyData(string SelectTxt)
        {
            SqlCommand Cmd = new SqlCommand(SelectTxt, GetConn());
            object Result = Cmd.ExecuteScalar();
            Cmd.Connection.Close();
            return Result;
        }

        /// <summary>
        /// 执行语句，并返回受影响的行数
        /// </summary>
        /// <param name="CmdTxt">要执行的 增、删、改 语句</param>
        /// <returns>返回受影响的行数</returns>
        protected int RunSqlCommand(string CmdTxt)
        {
            SqlCommand Cmd = new SqlCommand(CmdTxt, GetConn());
            int ExecuteCount = Cmd.ExecuteNonQuery();
            Cmd.Connection.Close();
            Cmd.Dispose();
            return ExecuteCount;
        }

        /// <summary>
        /// 执行存储过程，并返回存储过程执行结果（字符串）
        /// </summary>
        /// <param name="ProcName">存储过程名称</param>
        /// <param name="DataParas">存储过程参数集</param>
        /// <param name="HasResult">该存储过程是否有返回值</param>
        /// <returns>存储过程返回值</returns>
        protected ProcResultValue ExeProc(string ProcName, DataParameters DataParas, bool HasResult)
        {
            // 此处预留异常处理Try catch， 由Application获取并跳转异常页面。
            // 返回值
            ProcResultValue Result = new ProcResultValue();

            // 创建 Command
            SqlCommand Cmd = new SqlCommand(ProcName, GetConn());
            Cmd.CommandType = CommandType.StoredProcedure;
            
            // 遍历 存储过程参数集
            foreach (System.Collections.DictionaryEntry obj in DataParas.Parameters)
            {
                Cmd.Parameters.Add(obj.Key.ToString(), (SqlDbType)((object[])obj.Value)[0]).Value = ((object[])obj.Value)[1];
            }

            // 创建返回参数
            if (HasResult)
            {
                Cmd.Parameters.Add("@Result", SqlDbType.NVarChar, -1);
                Cmd.Parameters["@Result"].Direction = ParameterDirection.Output;
            }

            //存储过程默认返回值  存储过程：Return
            Cmd.Parameters.Add("@Return", SqlDbType.Int);
            Cmd.Parameters["@Return"].Direction = ParameterDirection.ReturnValue;

            // 执行存储过程
            Cmd.ExecuteNonQuery();

            // 获得返回值
            if (HasResult)
                Result.ResultValueStr = Cmd.Parameters["@Result"].Value.ToString();
            Result.ReturnValueInt = (Cmd.Parameters["@Return"].Value is int ? (int)Cmd.Parameters["@Return"].Value : -1);

            // 关闭数据库链接
            Cmd.Connection.Close();

            // 在这里执行一些存储过程catch异常的操作
            if(Result.ReturnValueInt == -1)
            {

            }

            // 返回执行结果
            return Result;
        }

        /// <summary>
        /// 执行函数，并返回函数执行结果
        /// </summary>
        /// <param name="FuncName">函数名称</param>
        /// <param name="DataParas">函数参数集</param>
        /// <param name="ResultType">返回值类型</param>
        /// <returns>存储过程返回值</returns>
        protected object ExeFunc(string FuncName, DataParameters DataParas, SqlDbType ResultType)
        {
            // 返回值
            object Result = null;

            // 创建 Command
            SqlCommand Cmd = new SqlCommand(FuncName, GetConn());
            Cmd.CommandType = CommandType.StoredProcedure;

            // 遍历 存储过程参数集
            foreach (System.Collections.DictionaryEntry obj in DataParas.Parameters)
            {
                Cmd.Parameters.Add(obj.Key.ToString(), (SqlDbType)((object[])obj.Value)[0]).Value = ((object[])obj.Value)[1];
            }

            // 创建返回参数
            Cmd.Parameters.Add("@Return", ResultType, -1);
            Cmd.Parameters["@Return"].Direction = ParameterDirection.ReturnValue;

            // 执行存储过程
            Cmd.ExecuteScalar();

            // 获得返回值
            Result = Cmd.Parameters["@Return"].Value;

            // 关闭数据库链接
            Cmd.Connection.Close();

            // 返回执行结果
            return Result;
        }
    }
}

namespace Ant.DAL
{
    /// <summary>
    /// 数据库[存储过程、函数]参数类
    /// </summary>
    public class DataParameters
    {
        private Hashtable HT = new Hashtable(); // 存储过程参数表

        /// <summary>
        /// 数据库[存储过程、函数]参数类 构造函数
        /// </summary>
        public DataParameters()
        {
        }

        /// <summary>
        /// 数据库[存储过程、函数] 参数表
        /// </summary>
        public Hashtable Parameters
        {
            get
            {
                return HT;
            }
        }

        /// <summary>
        /// 添加数据库[存储过程、函数]的参数
        /// </summary>
        /// <param name="ParaName">参数名称</param>
        /// <param name="ParaType">参数类型</param>
        /// <param name="ParaValue">参数值</param>
        public void Add(string ParaName, SqlDbType ParaType, object ParaValue)
        {
            HT.Add(ParaName, new object[] { ParaType, ParaValue });
        }
    }
}

        /// <summary>
        /// （查询调用）根据条件查询系统操作对象数据
        /// </summary>
        /// <param name="sqlField">查询字段</param>
        /// <param name="sqlWhere">查询条件 注：不要加 Where</param>
        /// <param name="orderBy">排序 注：不要加 Order By</param>
        /// <param name="pageSize">页大小 大于等于 0</param>
        /// <param name="pageIndex">页码 大于等于 1</param>
        /// <returns>返回：SqlDataReader</returns>
        public SqlDataReader GetData(string sqlField, string sqlWhere, string orderBy, int pageSize, int pageIndex)
        {
            return base.GetDataReader("Base_Action", sqlField, sqlWhere, orderBy, pageSize, pageIndex);
        }

        /// <summary>
        /// （存储过程增删改调用）设置单条系统操作对象
        /// </summary>
        /// <param name="editSign">操作标识</param>
        /// <param name="ID">主键ID</param>
        /// <param name="Menu">类型ID（系统菜单ID、公共页面对象ID）</param>
        /// <param name="Name">名称：按钮/链接ID</param>
        /// <param name="Text">描述：按钮/连接名称</param>
        /// <returns>返回：操作结果　空／异常信息</returns>
        public ProcResultValue SetActionInfo(SetActionInfo_EditSign editSign, long ID, long Menu, string Name, string Text)
        {
            DataParameters DP = new DataParameters();
            DP.Add("@EditSign", System.Data.SqlDbType.Int, (int)editSign);
            DP.Add("@ID", System.Data.SqlDbType.BigInt, ID);
            DP.Add("@Menu", System.Data.SqlDbType.BigInt, Menu);
            DP.Add("@Name", System.Data.SqlDbType.VarChar, Name);
            DP.Add("@Text", System.Data.SqlDbType.NVarChar, Text);
            return base.ExeProc("P_Base_Action", DP, true);
        }