how to use GETDATE() function with xml exist() function - sql

Question

I have a scenario where i have to use xml exist() function in where clause of the query. where i have to compare date from the xml with the current date. When i try to use GETDATE() function, i get below error.
The argument 1 of the XML data type method "exist" must be a string literal.
Please consider below query for your reference.
SELECT
TRY_CONVERT(datetime,NULLIF(t.x.value('(./Expire)[1]','varchar(max)'), '')) as expiration_date
FROM VW_Analytics_Base_Facts(nolock) BaseFact
CROSS APPLY BaseFact.Fact.nodes ('/Fact/Grant') t(x)
WHERE TYPE = '/asset/portfolio/option'
AND BaseFact.Fact.exist('./Expire[(text()[1] cast as xs:date?) le xs:date("' + CONVERT(NVARCHAR(max),CONVERT(date,GETDATE()))+'")]')=1
Thanks in advance.
Below is the updated working query.
DECLARE #tbl TABLE (XmlCol xml)
INSERT INTO #tbl VALUES
('<option>
<OptionName>Option 1</OptionName>
<grant>
<GrantName>Grant 1</GrantName>
<schedules>
<schedule>
<scheduleID></scheduleID>
<scheduleName></scheduleName>
<scheduleDate>1/1/2018</scheduleDate>
<scheduleAmount></scheduleAmount>
</schedule>
<schedule>
<scheduleID></scheduleID>
<scheduleName></scheduleName>
<scheduleDate>2/1/2018</scheduleDate>
<scheduleAmount></scheduleAmount>
</schedule>
<schedule>
<scheduleID></scheduleID>
<scheduleName></scheduleName>
<scheduleDate>3/1/2018</scheduleDate>
<scheduleAmount></scheduleAmount>
</schedule>
</schedules>
</grant>
<grant>
<GrantName>Grant 2</GrantName>
<schedules>
<schedule>
<scheduleID></scheduleID>
<scheduleName></scheduleName>
<scheduleDate>1/1/2019</scheduleDate>
<scheduleAmount></scheduleAmount>
</schedule>
<schedule>
<scheduleID></scheduleID>
<scheduleName></scheduleName>
<scheduleDate>2/1/2019</scheduleDate>
<scheduleAmount></scheduleAmount>
</schedule>
<schedule>
<scheduleID></scheduleID>
<scheduleName></scheduleName>
<scheduleDate>3/1/2019</scheduleDate>
<scheduleAmount></scheduleAmount>
</schedule>
</schedules>
</grant>
</option>'
)
SELECT e.XmlCol.value('(/option/OptionName)[1]', 'varchar(100)'),
t.x.value('../.././GrantName[1]','varchar(100)') GrantName,
t.x.value('(./scheduleDate)[1]', 'varchar(100)') scheduleDate
FROM #tbl e
CROSS APPLY (SELECT CONVERT(date,GETDATE())) dt(today)
cross apply e.XmlCol.nodes ('/option/grant/schedules/schedule') t(x)
WHERE e.XmlCol.exist('./scheduleDate[(text()[1] cast as xs:date?) le sql:column("dt.today")]')=1
i want to filter the record based on schedule date.
This query is a part of view so i cannot declare a variable.

Answer 1

Next time please append a stand-alone working sample with DDL, data inserts, your own code and the expected output. This would allow to test a solution.
In this case I have to guess and post untested:
SELECT
TRY_CONVERT(datetime,NULLIF(t.x.value('(./Expire)[1]','varchar(max)'), '')) as expiration_date
FROM VW_Analytics_Base_Facts(nolock) BaseFact
CROSS APPLY (SELECT CONVERT(date,GETDATE())) dt(today)
CROSS APPLY BaseFact.Fact.nodes ('/Fact/Grant') t(x)
WHERE TYPE = '/asset/portfolio/option'
AND BaseFact.Fact.exist('./Expire[(text()[1] cast as xs:date?) le sql:column("dt.today")]')=1;
This query will use one more CROSS APPLY in order to include the information in the resultset. The function sql:column() allows to use a result set's column within XQuery without breaking the must-be-a-literal rule (use sql:variable() to get hands on a declared variable's value).
UPDATE
Your idea to apply the filter as early as possible is not wrong. This was even better as predicate within .nodes(). But you have to rely on an implicit cast, something you should not do.
The expression (text()[1] cast as xs:date?) will use the system's culture. A value like 1/3/2018 might be taken as 1st of March or as 3rd of January. Therefore I'd suggest to read the value as string and use CONVERT with the appropriate style:
Btw: I use two times CROSS APPLY with .nodes() to avoid backward navigation (../../)
WITH DerivedTable AS
(
SELECT e.XmlCol.value('(/option/OptionName/text())[1]', 'varchar(100)') AS OptionName
,gr.value('(GrantName/text())[1]','varchar(100)') GrantName
,sch.value('(scheduleID/text())[1]', 'varchar(100)') scheduleID --use appropriate type, might be "int"
,sch.value('(scheduleName/text())[1]', 'varchar(100)') scheduleName
,CONVERT(DATE,sch.value('(scheduleDate/text())[1]', 'varchar(100)'),110) scheduleDate --fetch this as varchar, to avoid implicit casts
--use CONVERT with the appropriate style to get a real date
--110 is mdy, 103 is dmy
,sch.value('(scheduleAmount/text())[1]', 'varchar(100)') scheduleAmount --use appropriate type, might be "decimal(12,4)"
FROM #tbl e
CROSS APPLY e.XmlCol.nodes ('/option/grant') A(gr)
CROSS APPLY A.gr.nodes('schedules/schedule') B(sch)
)
SELECT dt.*
FROM DerivedTable dt
--use a simple WHERE here
This will return the XML's content as derived table. Use a simple WHERE to filter this derived table.

Answer 2

Below is the work around which worked for me.
SELECT e.XmlCol.value('(/option/OptionName)[1]', 'varchar(100)') OptionName,
t.x.value('../.././GrantName[1]','varchar(100)') GrantName,
t.x.value('(./scheduleDate)[1]', 'varchar(100)') scheduleDate
FROM #tbl e
CROSS APPLY e.XmlCol.nodes ('/option/grant/schedules/schedule') t(x)
WHERE TRY_CONVERT(datetime,NULLIF(t.x.value('(./scheduleDate)[1]','varchar(max)'), '')) BETWEEN CONVERT(date,GETDATE()) AND DATEADD(YEAR, 1, GETDATE())