SELECT XML FROM TABLE IN SQL SERVER

问题

I have XML stored in my table. This table has columns id type int, and value type XML. I'm using SQL Server 2012.

XML looks like this:

 <?xml version="1.0" encoding="utf-16"?>
 <Weather>
 <Forecast>
 <Description>sky is clear</Description>
 <Date>6.9.2013 23:50:36</Date>
 <MinTemp>13</MinTemp>
 <MaxTemp>13</MaxTemp>
 <Pressure>995</Pressure>
 <Humidity>68</Humidity>
 </Forecast>
 </Weather>

This XML can have up to then Forecast parts. How can I with simple SELECT statement get for instance Humidity value?

I have been trying several thins I found here, but I keep getting NULL so that's the reason I'm asking this question. Please help...

回答1:

Try like this:-

select
  columnname
from
  MyTable
where
  columnname.value('(/Weather/Forecast)[1]', 'varchar(max)') like 'StringToSearchFor'

or as suggested in this link like this:-

SELECT 
[xmlField].value('(/Weather//Forecast/Description/node())[1]', 'nvarchar(max)') as columname
FROM [myTable]

回答2:

If you have more than one Forecast in your xml, use nodes function:

select
    id, d.c.value('Humidity[1]', 'bigint') as Humidity
from test as t
    outer apply t.Data.nodes('Weather/Forecast') as d(c)

sql fiddle demo

来源：https://stackoverflow.com/questions/18705045/select-xml-from-table-in-sql-server