解析时将数据类型 varchar 转换为 float 时出错

Question

我创建了一个将解析原始数据的存储过程。下面的代码是存储过程的一部分。我正在测试它 returns 一个错误 'Error converting data type varchar to float.'。如果您注意到我在 case 和 else 中都更改了 KM2 中的原始数据。

谁能帮我解决这个问题，在此先感谢大家的帮助。

SELECT [Account]  = LEFT('351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3',CHARINDEX(',','351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3') - 1),
   [TrxDateTime] = cast(stuff(stuff(stuff((SUBSTRING('351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3', 27, 12)), 7,0,' '), 10,0,':'), 13,0,':') as datetime),
   [PhilTime] = GETDATE(),
   [GPSStatus] = CASE WHEN(SUBSTRING('351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3', 40, 1) = 'A')
                THEN 'OK'
                ELSE 'Message Not Valid' END,
   [Lat] = cast(SUBSTRING('351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3', 42, 9) as float)/100,
   [Long] = cast(SUBSTRING('351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3', 53, 10) as float)/100,
   [Speed2] = cast(SUBSTRING('351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3', 65, 1) as float)*1.852/1000,
   [ENGINE] = CASE WHEN (SUBSTRING('351856040520298,241111;1G,141007034741,A,1430.4280N,12100.0551E,0.0,330,0.8,20000000;2G,141007034741,11,22.8,12.87,04.09,273342044.3', 77, 1) = '2')
                THEN 'ON'
                 ELSE 'OFF' END,
   [KM2] = CASE WHEN(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11) like '%,%')
                THEN 'NULL'
                --ELSE 'BDADADADAD' END,
                ELSE round(cast(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11)as float)/3600, 0, 1) END,
   [PlateNo] = NULL,
   [ProcStatus] = '0';

我一直遇到的错误是

Msg 8114, Level 16, State 5, Line 1
Error converting data type varchar to float.

Answer 1

你在这里遇到了双重问题。让我们拿一段代码

--ELSE 'BDADADADAD' END,
ELSE
round(cast(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11)as float)/3600, 0, 1) END,

您需要更改以下两项中的一项。 IF 到 NULL 中的 'NULL' 或数值，或在你的声明中 ELSE 应该 return Varchar。但是，如果您的 ELSE 将以其当前形式命中，由于我在下面解释的原因，它仍然是一个问题。例如，这有效：

select  CASE WHEN(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11) like '%,%')
            THEN 'Null'
            ELSE cast(round(cast(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11)as float)
            /3600, 0, 1)as varchar) END

之所以有效，是因为 if 和 else return 相同的数据类型，并且永远不会命中 else。并检查一下 - 这也有效：

 select  CASE WHEN(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11) like '%,%')
            THEN 1
            ELSE cast(cast(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11)as float)
            /3600, 0, 1) END

现在。看这部分：right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11) 它将 return .8,01004000

现在，您将此结果包含在 cast - cast('.8,01004000' as float)

中

你的问题 - “.8,01004000”看起来不像是 float 的字符串表示形式。

现在，检查一下

select CAST('.8,01004000' as float) - 不工作（将数据类型 varchar 转换为 float 时出错） select CAST('.801004000' as float) - 工作

Answer 2

错误出在您对 [KM2] 的定义中。通过取消引用 'NULL' 将其更改为 NULL，如下所示：

...
[KM2] = CASE WHEN(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11) like '%,%')
            THEN NULL
            ELSE round(cast(right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11)as float)/3600, 0, 1) END,
...

解析时将数据类型 varchar 转换为 float 时出错

Error converting data type varchar to float when parsing

sql

sql-server

stored-procedures