.net - 如何抑制或忽略 SQL SELECT 语句中的错误

Question

有人知道如何抑制/忽略 select 语句中的错误吗？

我的 select 语句使用 STLineFromText 函数，当它遇到无效行时，会引发错误。我可以忽略坏行，并且无法真正更改我的源数据。

这是一个演示我的问题的示例查询:

SELECT geography::STLineFromText('LINESTRING(-74.2204037952351 40.4283173372472,-74.2204851952350 40.4283519372471)', 4326) UNION ALL
SELECT geography::STLineFromText('LINESTRING(-74.2316367952177 40.4386102038979,-74.2313671952181 40.4388540705641)', 4326) UNION ALL
SELECT geography::STLineFromText('LINESTRING(-74.2229282618978 40.4252709372519,-74.2229171285645 40.4252638039186,-74.2229282618978 40.4252709372519,-74.2227441952315 40.4251499372521,-74.2231121285642 40.4243291372534)', 4326) UNION ALL
SELECT geography::STLineFromText('LINESTRING(-74.2418989952017 40.4417621372263,-74.2417773285352 40.4417915372263)', 4326) UNION ALL
SELECT geography::STLineFromText('LINESTRING(-74.2166069952410 40.4334496039059,-74.2158269952422 40.4336396039056)', 4326)

这是错误:

Msg 6522, Level 16, State 1, Line 2
A .NET Framework error occurred during execution of user-defined routine or aggregate "geography": 
System.ArgumentException: 24200: The specified input does not represent a valid geography instance.
System.ArgumentException: 
   at Microsoft.SqlServer.Types.SqlGeography.ConstructGeographyFromUserInput(GeoData g, Int32 srid)
   at Microsoft.SqlServer.Types.SqlGeography.GeographyFromText(OpenGisType type, SqlChars taggedText, Int32 srid)

理想的情况是只返回 #1、#2、#4 和 #5，忽略 #3

谢谢!

Answer 1

所以我硬着头皮编写了自己的 CLR 函数，以便可以合并 try/catch。它运行得很好。

<Microsoft.SqlServer.Server.SqlFunction()> _
Public Shared Function STLineFromTextFlexible(ByVal LineString As SqlChars, ByVal SRID As Integer) As Microsoft.SqlServer.Types.SqlGeography
    Try
        Dim Geo As New SqlGeography()

        Geo = SqlGeography.STLineFromText(LineString, SRID)

        Return Geo
    Catch ex As Exception
        Return Nothing
    End Try
End Function

鸣谢:

http://msdn.microsoft.com/en-us/library/w2kae45k(v=vs.80).aspx

http://msdn.microsoft.com/en-us/library/ms131065.aspx