I have a SQL Server 2005 query that generates a large result set (up to several gigabytes):
SELECT * FROM Product FOR XML PATH('Product')
Running the query generates a single row containing a document with many product elements:
Row 1:
<Product>
<Name>Product One</Name>
<Price>10.00</Price>
</Product>
<Product>
<Name>Product Two</Name>
<Price>20.00</Price>
</Product>
...
I would like to change the query so that instead of a result set with one row containing a single document with multiple product elements, it returns multiple rows each with a single document consisting of a sing Product element:
Row 1:
<Product>
<Name>Product One</Name>
<Price>10.00</Price>
</Product>
Row 2:
<Product>
<Name>Product Two</Name>
<Price>20.00</Price>
</Product>
In the end, I would like to consume this query from C# with an IDataReader without either SQL Server or my application having the entire result set loaded in to memory. Are there any changes I could make to the SQL to enable this scenario?
I think you want something like this.(you can run below query on AdventureWorks)
SELECT ProductID
,( SELECT * FROM Production.Product AS b WHERE a.ProductID= b.ProductID FOR XML PATH('Name') ) AS RowXML
FROM Production.Product AS a
I Think This will give you good result,
SELECT top 3 Productid,Name, XmlColumn from Production.Product a cross apply ( select top 1 a.* from Production.Product b FOR XML PATH('test')) as outputdata(XmlColumn)
If you know the column names, I'd rather avoid the nested select to the table
SELECT ProductID,(SELECT Name, Price FOR XML RAW('Product'),ELEMENTS) AS RowXML
FROM Production.Product AS a
if PRICE and NAME are in one table Product
SELECT * FROM Product FOR XML AUTO, ELEMENTS
or, if not, you can create a view vw_Product which will return only 2 columns that you want and then write
SELECT * FROM vw_Product as Product FOR XML AUTO, ELEMENTS
you can use XmlReader to read from the results of this query row by row, to avoid loading big XML document in memory.
See http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executexmlreader.aspx
in your query you used PATH('Product'), an this is why it produced a single node with all products.
Related
I want to update the content of a table calls VIDEO_TAGS which contains 3 columns, fk_video_id, principal (not too important), and tag_value.
I want to do an update as follows,
"UPDATE VIDEO_TAGS
SET tag_value= :newTag
where tag_value= :oldTag
and fk_video_id = (SELECT FROM VIDEO_TAGS fk_video_id where tag_value= :productName)"
but it is clear that the sub-query will return many elements, while I only need one element -more than one row returned by a subquery used as an expression ERROR-.
my question is how to edit the sub-query to get the one element that I need? Thank you
I have a class that contains a LINKMAP field called links. This class is used recursively to create arbitrary hierarchical groupings (something like the time-series example, but not with the fixed year/month/day structure).
A query like this:
select expand(links['2017'].links['07'].links['15'].links['10'].links) from data where key='AAA'
Returns the actual records contained in the last layer of "links". This works exactly as expected.
But a query like this (note the 10,11 in the second to last layer of "links"):
select expand(links['2017'].links['07'].links['15'].links['10','11'].links) from data where key='AAA'
Returns two rows of the last layer of "links" instead:
{"1000":"#23:0","1001":"#24:0","1002":"#23:1"}
{"1003":"#24:1","1004":"#23:2"}
Using unionAll or intersect (with or without UNWIND) results in this single record:
[{"1000":"#23:0","1001":"#24:0","1002":"#23:1"},{"1003":"#24:1","1004":"#23:2"}]
But nothing I've tried (including various attempts at "compound" SELECTs) will get the expand to work as it does with the original example (i.e. return the actual records represented in the last LINKMAP).
Is there a SQL syntax that will achieve this?
Note: Even this (slightly modified) example from the ODB docs does not result in a list of linked records:
select expand(records) from
(select unionAll(years['2017'].links['07'].links['15'].links['10'].links, years['2017'].links['07'].links['15'].links['11'].links) as records from data where key='AAA')
Ref: https://orientdb.com/docs/2.2/Time-series-use-case.html
I'm not sure of what you want to achieve, but I think it's worth trying with values():
select expand(links['2017'].links['07'].links['15'].links['10','11'].links.values()) from data where key='AAA'
I have a mongo database and I'm trying to write an Eloquent code to change some fields before using them in WHERE or ORDER BY clauses. something like this SQL query:
Select ag.*, ht.*
from agency as ag inner join hotel as ht on ag.hotel_id = ht.id
Where ht.title = 'OrangeHotel'
-- or --
Select ag.*, ht.*
from agency as ag inner join hotel as ht on ag.hotel_id = ht.id
Order by ht.title
sometimes there is no other table and I just need to use calculated field in Where or Order By clause:
Select *
from agency
Where func(agency_admin) = 'testAdmin'
Select *
from agency
Order by func(agency_admin)
where func() is my custom function.
any suggestion?
and I have read Laravel 4/5, order by a foreign column for half of my problem, but I don't know how can I use it.
For the first query: mongodb only support "join" partially with the aggregation pipeline, which limits your aggregation in one collection. For "join"s between different collections/tables, just select from collections one by one, first the one containing the "where" field, then the one who should "join" with the former, and so on.
The second question just puzzled me for some minutes until I see this question and realized it's the same as your first question: sort the collection containing your sort field and retrive some data, then go to another.
For the 3rd question, this question should serve you well.
I am trying to determine a solution to filter records using LIKE with a multi-valued parameter. In a simplistic example a user wants to return a set of 5-digit Object codes by entering the following in a parameter window in a SSRS report:
#parm_Object
1,24,333,34567
This ideally would return Object codes satisfying the following criteria:
1 : All Object codes starting with '1'
24: All Object codes starting with '24'
333: Similar
34567: Object code '34567'
I guess a starting point for me would be to determine whether this could be handled in the actual query, or should I do it on the SSRS side.
general good practice is to get rid of the data you don't need ASAP. so that would be in the query.
a SSRS multivalued parameter will show up as a comma separated list in the query.
the first step is to get from this comma separated list to a table (or table function), then you can join this table and apply like operators
for example
SELECT *
FROM INFORMATION_SCHEMA.COLUMNS a
INNER JOIN dbo.split1('test,fafa,tata') b
ON 1=1
WHERE a.COLUMN_NAME like b.Value + '%'
will return rows having column names starting with test, fafa or tata. the dbo.split1 function you have to write your own or get one from the internet. the link suggested by Tab Alleman for example.
I have a dataset that is a query which has a where clause like this 'where field1 like #parameter1' parameter1 is a string defined as a parameter in the dataset1. I have various text boxes that calls the dataset with expressions like =First(Fields!field_xx, "Dataset1"). For each textbox I like to specify a different value for #parameter1 when it calls the "dataset1". How can I modify the expression in each textbox as to call the "dataset1" from each of them with a hardcoded value for #parameter1
the query:
SELECT TOP (1) job.job_id, job.originating_server, job.name, job.enabled, job.description, job.start_step_id, job.category_id, job.owner_sid, job.notify_level_eventlog,
job.notify_level_email, job.notify_level_netsend, job.notify_level_page, job.notify_email_operator_id, job.notify_netsend_operator_id, job.notify_page_operator_id,
job.delete_level, job.date_created, job.date_modified, job.version_number, job.originating_server_id, job.master_server, activity.session_id, activity.job_id AS Expr1,
activity.run_requested_date, activity.run_requested_source, activity.queued_date, activity.start_execution_date, activity.last_executed_step_id,
activity.last_executed_step_date, activity.stop_execution_date, activity.job_history_id, activity.next_scheduled_run_date, steps.step_name
FROM sysjobs_view AS job INNER JOIN
sysjobactivity AS activity ON job.job_id = activity.job_id INNER JOIN
sysjobsteps AS steps ON activity.last_executed_step_id = steps.step_id AND activity.job_id = steps.job_id
WHERE (job.name LIKE 'Actual Job Name')
ORDER BY activity.start_execution_date DESC
It is not possible to call a dataset with different parameters in the same report execution. Every execution and rendering of the report fetches each dataset only once.
This means that you have to construct your dataset in a way so that it returns all the data you need, to populate each of your textboxes.
Depending on your data model, you may want to add more columns to your dataset, or return the data in multiple rows. If you have multiple rows, then you can use the Lookup function in an expression, to filter out the row in each individual textbox.
Perhaps if you elaborated a little more on what your report should look like, and what the structure of the data you are fetching is, it would be possible to give a better answer to how to solve your problem with a single dataset.