Question

Asmx代码：

            SqlDataReader rdr = cmd.ExecuteReader();
            while (rdr.Read())
            {
                HBPivot_cs thpivot = new HBPivot_cs();
                thpivot.EMPLOYEEID = rdr["EMPLOYEEID"].ToString();
                thpivot.FIRSTDATE = rdr["06/26/2018"].ToString();
                thpivot.SECONDDATE = rdr["06/27/2018"].ToString();
                listhbpivot.Add(thpivot);
            }
            con.Close();

我的数据：此数据来自Pivot

EMPLOYEEID     06/26/2018     06/27/2018     06/28/2018     06/29/2018
1              07:00 AM       08:00 AM       07:30 AM       10:00 AM
2              07:01 AM       08:20 AM       07:10 AM       06:00 AM

字段名是动态的...我如何使用rdr.read检索它谢谢

Answer 1

在您的sql服务器数据库中创建以下存储过程。

create procedure dbo.EmploeeDynamicPivot
as
begin

    set nocount on;

    declare
        @columns    as nvarchar(max),
        @query      as nvarchar(max)

    select
        @columns    =
        stuff
        ((
                select
                distinct
                    ',' + quotename([your_date_column]) 
                from
                    [your_table]
                for xml path(''), type
        ).value('.', 'nvarchar(max)'), 1, 1, '')


    set @query =
    'select
        EMPLOYEEID, ' + @columns + '
    from 
    (
        select
            EMPLOYEEID   ,
            [your_date_column]   ,
            [your_value_column]
        from
            [your_table]
    )
        sourceTable
    pivot 
    (
        sum([your_value_column])
        for [your_date_column] in (' + @columns + ')
    )
        pivotTable'


    execute(@query);

    set nocount off;

end

通过以下代码编辑c＃代码。

var sqlConnection = new SqlConnection([your_connection_string]);

sqlConnection.Open();

var sqlCommand = sqlConnection.CreateCommand();

sqlCommand.CommandType = CommandType.StoredProcedure;
sqlCommand.CommandText = "EmploeeDynamicPivot";

var rdr = sqlCommand.ExecuteReader();

while (rdr.Read())
{
    for (int i = 0; i < rdr.FieldCount; i++)
    {
        var value = rdr.GetString(i);
        or
        var value = rdr.GetValue(i);

        //do something... 
    }
}
...

从数据透视SQL Server动态检索数据

1 个答案: