Question

我想知道如何用干净的Entity Framework Core任务替换我的EF FromSql()扩展。

我的查询如下：

 activities = await _context.SubActivities
            .FromSql(SubActivityQueryLibrary.GetRouteCombustionForDevices(deviceIds, dateFrom))
            .Select(dict => new { Key = dict.StartTime, Value = Convert.ToDouble(dict.ConsumptionFuel) })
            .OrderBy(o => o.Key)
            .ToDictionaryAsync(x => x.Key, x => x.Value);

和SQL查询：

SELECT 
    CONVERT(DATE, StartTime) AS [StartTime], 
    SUM(ConsumptionFuel) AS [ConsumptionFuel]
FROM 
    [Flota24].[dbo].[ACTIVITIES]
WHERE 
    DeviceId IN ({string.Join(",", deviceIds)}) 
    AND StartTime >= '{startDate:yyyy-MM-dd}'
GROUP BY 
    CONVERT(DATE, StartTime)

只想将难以转换的维护SQL代码转换为EF Core。我尝试使用SUM，GROUP和CONVERT()创建一些内容，但总是遇到一些麻烦。

Answer 1

EF Core任务应替换为以下代码：

 activities = await _context.SubActivities
            .Where(d => deviceIds.Contains(d.DeviceId) && d.StartTime >= dateFrom)
            .GroupBy(o => o.StartTime.Date)
            .Select(dict => new { Key = dict.Key, Value = Convert.ToDouble(dict.Sum(x => x.ConsumptionFuel)) })
            .OrderBy(o => o.Key)
            .ToDictionaryAsync(x => x.Key, x => x.Value);

可以删除SQL查询。

使用干净的EF Core查询替换实体框架FromSql（）

1 个答案: