Question

我将我的报告网站从MySQL转换为使用C＃的MongoDB。到目前为止，我对MongoDB插入数据感到满意。现在，从收藏中，我需要打印出来。

原创，我的查询就像这样

strSQL = "SELECT " +
                " '" + strSearchingStartDate + "' AS SearchStartDate, '" + strSearchingEndDate + "' AS SearchEndDate, '" + strCurrentUserName + "' as WhoPrint, " +
                " machinelograwdata.MachineID , " +
                " machinelograwdata.Parameter1 AS 'Code', " +
                " machinelograwdata.Parameter42 AS 'Orders', " +
                " Temp2.HideStartTime AS StartTime, " +
                " machinelograwdata.EndTime, " +
                " UNIX_TIMESTAMP(machinelograwdata.EndTime) - UNIX_TIMESTAMP(Temp2.HideStartTime) AS Duration, " +
                " Temp.StartTime AS CutStartTime, " +
                " Temp.EndTime AS CutEndTime, " +
                " Temp.Duration AS CutDuration, " +
                " NULL AS NestingStartTime, " +
                " NULL AS NestingEndTime, " +
                " '0.00' AS NestingDuration, " +
                " '0.00' AS 'SupplierAream2', " +
                " ROUND(machinelograwdata.Parameter3 / 1000000, 2) AS 'GrossAream2', " +
                " ROUND(machinelograwdata.Parameter26 / 1000000, 2) AS 'NetAream2', " +
                " machinelograwdata.Parameter27 AS 'YieldPercen', " +
                " machinelograwdata.Parameter25 AS 'NoPiece', " +
                " machinelograwdata.Parameter24 AS 'Material', " +
                " machinelograwdata.Parameter44 AS 'Models', " +
                " ROUND(machinelograwdata.Parameter9 / 1000000, 2) AS 'Quantity0Area', " +
                " '0.00' AS 'Quantity1Area', " +
                " '0.00' AS 'Quantity2Area' " +
                " FROM " +
                " machinelograwdata " +
                " INNER JOIN catalogue" +
                " ON machinelograwdata.EventID = catalogue.CatalogueID " +
                " LEFT JOIN " +
                "   (SELECT MachineID, Parameter1, EndTime, StartTime,  UNIX_TIMESTAMP(EndTime) - UNIX_TIMESTAMP(StartTime) AS Duration " +
                "   FROM " +
                "     (SELECT machinelograwdata.MachineID, machinelograwdata.Parameter1, " +
                "         MAX(machinelograwdata.EndTime) AS EndTime, " +
                "         MIN(machinelograwdata.StartTime) AS StartTime " +
                "   FROM " +
                "     machinelograwdata, catalogue " +
                "   WHERE " +
                "     machinelograwdata.EventID = catalogue.CatalogueID " +
                "         AND catalogue.CatalogueGroup = 'EventDesc' " +
                "         AND StartTime >= '" + strSearchingStartDate + "' " +
                "         AND StartTime <= '" + strSearchingEndDate + "' " +
                "         AND EventID = '15' " +
                "         AND machinelograwdata.Parameter2 = '0' " +
                "   GROUP BY machinelograwdata.Parameter1, machinelograwdata.MachineID) M) Temp  " +
                " ON Temp.Parameter1 = machinelograwdata.Parameter1 " +
                "    AND Temp.MachineID = machinelograwdata.MachineID " +
                " LEFT JOIN " +
                "   (SELECT MachineID, Parameter1, MIN(StartTime)AS HideStartTime " +
                "   FROM machinelograwdata " +
                "   WHERE EventID = '13' " +
                "     AND machinelograwdata.StartTime <= '" + strSearchingEndDate + "' " +
                "     AND machinelograwdata.StartTime >= '" + strSearchingStartDate + "' " +
                "   GROUP BY MachineID, Parameter1) Temp2 " +
                " ON Temp2.Parameter1 = machinelograwdata.Parameter1 " +
                "    AND Temp2.MachineID = machinelograwdata.MachineID " +
                " WHERE catalogue.CatalogueGroup = 'EventDesc' " +
                "     AND machinelograwdata.StartTime <= '" + strSearchingEndDate + "' " +
                "     AND machinelograwdata.StartTime >= '" + strSearchingStartDate + "' " +
                "     AND EventID = '14' " +
                "     AND CONVERT(Parameter35, DECIMAL) <> 0 " +
                " ORDER BY machinelograwdata.MachineID , machinelograwdata.StartTime;  ";

我的问题是，我可以用MongoDB编写相同的查询吗？

并且在那里＆＃34;查看＆＃34; MongoDB上的概念？因为我有使用View的另一个MySQL Report查询。

如果您有任何建议或意见，我将不胜感激。谢谢，托马斯

Answer 1

MongoDB和MySQL是两种截然不同的数据库解决方案。在维护数据方面，两者都遵循不同的方法。 MongoDB是NO SQL数据库意味着存储在其中的数据不与MySQL数据库中的数据模式绑定。

您无法使用SQL查询从MongoDB获取数据。 MongoDB有自己的查询引擎（由Javascript提供支持）来获取数据。

MongoDB不支持视图概念。

由于您可以使用C＃从MySQL加载MongoDB中的数据，我建议您检查MongoDB官方C# drivers以查看地图缩减操作。

一种方法是获取内存中的数据，然后构建报告。您可能还会找到一些将SQL查询映射到Mongo的在线解决方案，如this

在C＃中使用MongoDB查询报告的最佳方式是什么？

1 个答案: