Question

我创建了一个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。我正在测试它并返回错误＆＃39;将数据类型varchar转换为float时出错。＆＃39;。如果您注意到我在KM2中更改了原始数据，无论是在案例还是在其他地方。

有人可以帮助我如何做到正确，提前感谢所有帮助人员。

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

错误在您[KM2]的定义中。根据以下内容将'NULL'取消引用为NULL来更改它：

...
[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,
...

Answer 2

你在这里遇到了双重问题。让我们看一段你的代码

--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,

你需要改变两件事之一。 'NULL'到IF中的NULL或数值，或者您ELSE中的陈述应返回Varchar。但是如果你的ELSE会以当前的形式出现，那么由于我在下面解释的内容，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

它有效，因为if和else返回相同的数据类型，else永远不会被点击。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。看看这部分：right('351856040520389,241111;1G,141209203228,A,1437.3980N,12103.6893E,0.0,44,0.8,01004000', 11) 它将返回.8,01004000

现在，您将此结果括在cast - cast('.8,01004000' as float)

中

你的问题 - ＆＃34; .8,01004000＆＃34;看起来不像float的字符串表示。

现在，看看这个

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

解析时将数据类型varchar转换为float时出错

2 个答案: