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我相信我发现了一个错误。不知道在哪里，并寻找有关修复它的最佳方法的建议。

这是创建 sql 视图脚本的代码：

return MessageFormat.format(
            "CREATE VIEW {0} AS " +
            "SELECT T.{1} AS {2}, T.{3} AS {4}, T.{5} AS {6}, " +
            "T.{7} AS {8}, T.{9} AS {10}, " +
            "MAX(CASE WHEN T.{11} = TS.{12} THEN TS.{13} ELSE '''' END) AS {14}, " +
            "MAX(CASE WHEN T.{15} = TS.{16} THEN TS.{17} ELSE '''' END) AS {18}, " +
            "MAX(CASE WHEN T.{19} = TS.{20} THEN TS.{21} ELSE 0 END) AS {22}, " +
            "MAX(CASE WHEN T.{23} = TS.{24} THEN TS.{25} ELSE 0 END) AS {26}, " +
            "MAX(CASE WHEN T.{27} = TS.{28} THEN TS.{29} ELSE '''' END) AS {30}, " +
            "MAX(CASE WHEN T.{31} = TS.{32} THEN TS.{33} ELSE '''' END) AS {34}, " +
            "MAX(CASE WHEN T.{35} = TS.{36} THEN TS.{37} ELSE 0 END) AS {38}, " +
            "MAX(CASE WHEN T.{39} = TS.{40} THEN TS.{41} ELSE 0 END) AS {42}, " +
            "COALESCE(MAX(ABS(TA_Weight.{43})), 0) {44}, " +
            "COALESCE(MAX(ABS(TA_PayBasis.{45})), 0) {46}, " +
            "SUM(COALESCE(ABS(TSA_Miles.{47}), 0)) {48} " +
            "FROM {49} T " +
            "INNER JOIN {50} TS ON T.{51} = TS.{52} " +
            "LEFT OUTER JOIN {53} TA_Weight ON T.{54} = TA_Weight.{55} AND TA_Weight.{56} = ''H:W'' " +
            "LEFT OUTER JOIN {57} TA_PayBasis ON T.{58} = TA_PayBasis.{59} AND TA_PayBasis.{60} = ''H:AGR'' " +
            "LEFT OUTER JOIN {61} TSA_Miles ON TS.{62} = TSA_Miles.{63} AND TS.{64} = TSA_Miles.{65} AND TSA_Miles.{66} = ''D:DD'' " +
            "GROUP BY T.{67}, T.{68}, T.{69}, T.{70}, T.{71}",
            TRIP_VIEW_NAME,
            TRIP_COL_TRIP_ID, TRIP_VIEW_COL_TRIP_ID, TRIP_COL_IS_VIEWED, TRIP_VIEW_COL_IS_VIEWED, TRIP_COL_IS_ACCEPTED, TRIP_VIEW_COL_IS_ACCEPTED,
            TRIP_COL_IS_DECLINED, TRIP_VIEW_COL_IS_DECLINED, TRIP_COL_STATUS, TRIP_VIEW_COL_STATUS,
            TRIP_COL_FIRST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_MUNICIPALITY, TRIP_VIEW_COL_FROM_MUNICIPALITY,
            TRIP_COL_FIRST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_ADMINISTRATIVE_AREA, TRIP_VIEW_COL_FROM_ADMINISTRATIVE_AREA,
            TRIP_COL_FIRST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_SCHEDULED_ARRIVAL_FROM, TRIP_VIEW_COL_PICKUP_DATE,
            TRIP_COL_FIRST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_TIME_ZONE, TRIP_VIEW_COL_PICKUP_TIME_ZONE,
            TRIP_COL_LAST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_MUNICIPALITY, TRIP_VIEW_COL_TO_MUNICIPALITY,
            TRIP_COL_LAST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_ADMINISTRATIVE_AREA, TRIP_VIEW_COL_TO_ADMINISTRATIVE_AREA,
            TRIP_COL_LAST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_SCHEDULED_ARRIVAL_FROM, TRIP_VIEW_COL_DELIVERY_DATE,
            TRIP_COL_FIRST_STOP_NUMBER, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_COL_TIME_ZONE, TRIP_VIEW_COL_DELIVERY_TIME_ZONE,
            TRIP_ATTRIBUTE_COL_VALUE, TRIP_VIEW_COL_WEIGHT,
            TRIP_ATTRIBUTE_COL_VALUE, TRIP_VIEW_COL_PAY_BASIS,
            TRIP_STOP_ATTRIBUTE_COL_VALUE, TRIP_VIEW_COL_MILES,
            TRIP_TABLE_NAME,
            TRIP_STOP_TABLE_NAME, TRIP_COL_TRIP_ID, TRIP_STOP_COL_TRIP_ID,
            TRIP_ATTRIBUTE_TABLE_NAME, TRIP_COL_TRIP_ID, TRIP_ATTRIBUTE_COL_TRIP_ID, TRIP_ATTRIBUTE_COL_NAME,
            TRIP_ATTRIBUTE_TABLE_NAME, TRIP_COL_TRIP_ID, TRIP_ATTRIBUTE_COL_TRIP_ID, TRIP_ATTRIBUTE_COL_NAME,
            TRIP_STOP_ATTRIBUTE_TABLE_NAME, TRIP_STOP_COL_TRIP_ID, TRIP_STOP_ATTRIBUTE_COL_TRIP_ID, TRIP_STOP_COL_STOP_NUMBER, TRIP_STOP_ATTRIBUTE_COL_STOP_NUMBER, TRIP_STOP_ATTRIBUTE_COL_NAME,
            TRIP_COL_TRIP_ID, TRIP_COL_IS_VIEWED, TRIP_COL_IS_ACCEPTED, TRIP_COL_IS_DECLINED, TRIP_COL_STATUS);

你看我是如何用双勾转义单勾的，在我的理解中，'''' 应该变成 '' 结果字符串。

在 Android 模拟器中运行此代码，我得到以下字符串：

        CREATE VIEW TripView AS SELECT T.TripId AS TripId, T.IsViewed AS IsViewed, T.IsAccepted AS IsAccepted, T.IsDeclined AS IsDeclined, T.Status AS Status, 
MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.Municipality ELSE '' END) 
    AS FromMunicipality, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.AdministrativeArea ELSE '' END) AS FromAdministrativeArea, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.ScheduledArrivalFrom ELSE 0 END) AS PickupDate, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.TimeZone ELSE 0 END) AS PickupTimeZone, MAX(CASE WHEN T.LastDispatchedStopNumber = TS.StopNumber THEN TS.Municipality ELSE '' END) AS ToMunicipality, MAX(CASE WHEN T.LastDispatchedStopNumber = TS.StopNumber THEN TS.AdministrativeArea ELSE '' END) AS ToAdministrativeArea, MAX(CASE WHEN T.LastDispatchedStopNumber = TS.StopNumber THEN TS.ScheduledArrivalFrom ELSE 0 END) AS DeliveryDate, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.TimeZone ELSE 0 END) AS DeliveryTimeZone, COALESCE(MAX(ABS(TA_Weight.Value)), 0) Weight, COALESCE(MAX(ABS(TA_PayBasis.Value)), 0) PayBasis, SUM(COALESCE(ABS(TSA_Miles.Value), 0)) Miles FROM Trip T INNER JOIN TripStop TS ON T.TripId = TS.TripId LEFT OUTER JOIN TripAttribute TA_Weight ON T.TripId = TA_Weight.TripId AND TA_Weight.Name = 'H:W' LEFT OUTER JOIN TripAttribute TA_PayBasis ON T.TripId = TA_PayBasis.TripId AND TA_PayBasis.Name = 'H:AGR' LEFT OUTER JOIN TripStopAttribute TSA_Miles ON TS.TripId = TSA_Miles.TripId AND TS.StopNumber = TSA_Miles.StopNumber AND TSA_Miles.Name = 'D:DD' GROUP BY T.TripId, T.IsViewed, T.IsAccepted, T.IsDeclined, T.Status

当我在实际设备上运行时，我得到以下信息：

    CREATE VIEW TripView AS SELECT T.TripId AS TripId, T.IsViewed AS IsViewed, T.IsAccepted AS IsAccepted, T.IsDeclined AS IsDeclined, T.Status AS Status, 
MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.Municipality ELSE ''' END) 
AS FromMunicipality, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.AdministrativeArea ELSE ''' END) AS FromAdministrativeArea, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.ScheduledArrivalFrom ELSE 0 END) AS PickupDate, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.TimeZone ELSE 0 END) AS PickupTimeZone, MAX(CASE WHEN T.LastDispatchedStopNumber = TS.StopNumber THEN TS.Municipality ELSE ''' END) AS ToMunicipality, MAX(CASE WHEN T.LastDispatchedStopNumber = TS.StopNumber THEN TS.AdministrativeArea ELSE ''' END) AS ToAdministrativeArea, MAX(CASE WHEN T.LastDispatchedStopNumber = TS.StopNumber THEN TS.ScheduledArrivalFrom ELSE 0 END) AS DeliveryDate, MAX(CASE WHEN T.FirstDispatchedStopNumber = TS.StopNumber THEN TS.TimeZone ELSE 0 END) AS DeliveryTimeZone, COALESCE(MAX(ABS(TA_Weight.Value)), 0) Weight, COALESCE(MAX(ABS(TA_PayBasis.Value)), 0) PayBasis, SUM(COALESCE(ABS(TSA_Miles.Value), 0)) Miles FROM Trip T INNER JOIN TripStop TS ON T.TripId = TS.TripId LEFT OUTER JOIN TripAttribute TA_Weight ON T.TripId = TA_Weight.TripId AND TA_Weight.Name = 'H:W' LEFT OUTER JOIN TripAttribute TA_PayBasis ON T.TripId = TA_PayBasis.TripId AND TA_PayBasis.Name = 'H:AGR' LEFT OUTER JOIN TripStopAttribute TSA_Miles ON TS.TripId = TSA_Miles.TripId AND TS.StopNumber = TSA_Miles.StopNumber AND TSA_Miles.Name = 'D:DD' GROUP BY T.TripId, T.IsViewed, T.IsAccepted, T.IsDeclined, T.Status

看起来像某个地方的错误。脚本的第 3 行显示差异，'' vs '''

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1 回答 1

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根据MessageFormat 参考的规则，这看起来肯定是错误的。您的模拟器似乎在做正确的事情，但设备上的 JRE 似乎解释''''不正确。

表示两个单引号的另一种方法是像这样对它们进行转义：\'\'\'\'这可能会为您的设备的 JRE 提供足够的信息，以便您将它们分开处理。这可能仍会导致相同的错误，但值得一试以防万一。

我对三个单引号如何得出的猜测是：

  • 第一个单引号来自前两个
  • 第二个单引号来自第二个和第三个
  • 第三个单引号来自第 3 个和第 4 个

中间那个是错误的。第二个单引号在第一遍中被消耗，因此不应被视为另一对的一部分。

值得将此报告给您设备上使用的 JRE 的来源。

一个更简单的测试用例是这样的：

System.out.println(MessageFormat.format("Say ''''{0}''''", "hello"));

哪个应该给

问好''

as output, but should show three single quotes instead of two before and after 'hello' with the device's JRE.

于 2016-02-11T21:53:42.590 回答