I have entity (e.g. Setting) which contains collection (e.g. Settings.languages) with another objects (instances of Language).
Is there way how to select all entities which contains in its collection entity with required attribute value? e.g. get all Settings which Settings.languages contains Language.code = 'EN' ?
Something like:
SELECT s FROM Setting s WHERE :code MEMBER OF s.languages.code
You can use something like this:
SELECT s FROM Setting s INNER JOIN s.languages c WHERE c = :code
More examples was here
Related
Is there any way I can find labels which are not used in D365 FO (labels which dont have references)?
The cross references are stored in database DYNAMICSXREFDB. You can use a sql query to generate a list of labels that have no references.
This query uses two tables in the database:
Names holds an entry for each object in the application that can be referenced.
The Path field of the table holds the name of the object (e.g. /Labels/#FormRunConfiguration:ViewDefaultLabel is the path of the ViewDefaultLabel in the FormRunConfiguration label file.
Field Id is used to reference a record in this table in other tables.
References holds the actual references that connect the objects.
Field SourceId contains the Id of the Names record of the object that references another object identified by field TargetId.
The actual query could look like this:
SELECT LabelObjects.Path AS UnusedLabel
FROM [dbo].[Names] AS LabelObjects
WHERE LabelObjects.Path LIKE '/Labels/%'
AND NOT EXISTS
(SELECT *
FROM [dbo].[References] AS LabelReferences
WHERE LabelReferences.TargetId = LabelObjects.Id)
Make sure to compile the application to update the cross reference data. Otherwise the query might give you wrong results. When I run this query on a version 10.0.3 PU27 environment, it returns one standard label as a result.
I am trying to select data based on a status which is a string. What I want is that status 'draft' comes first, so I tried this:
SELECT *
FROM c
ORDER BY c.status = "draft" ? 0:1
I get an error:
Unsupported ORDER BY clause. ORDER BY item expression could not be mapped to a document path
I checked Microsoft site and I see this:
The ORDER BY clause requires that the indexing policy include an index for the fields being sorted. The Azure Cosmos DB query runtime supports sorting against a property name and not against computed properties.
Which I guess makes what I want to do impossible with queries... How could I achieve this? Using a stored procedure?
Edit:
About stored procedure: actually, I am just thinking about this, that would mean, I need to retrieve all data before ordering, that would be bad as I take max 100 value from my database... IS there any way I can do it so I don t have to retrieve all data first? Thanks
Thanks!
ORDER BY item expression could not be mapped to a document path.
Basically, we are told we can only sort with properties of document, not derived values. c.status = "draft" ? 0:1 is derived value.
My idea:
Two parts of query sql: The first one select c.* from c where c.status ='draft',second one select c.* from c where c.status <> 'draft' order by c.status. Finally, combine them.
Or you could try to use stored procedure you mentioned in your question to process the data from the result of select * from c order by c.status. Put draft data in front of others by if-else condition.
I have an Entity Match with two columns gamesP1, gamesP2. How do I query it to return all Entities where gamesP1 > gamesP2?
Datastore query filters must be written in terms of a value provided by the application at the time of the query; they can't refer to the values of other properties.
Depending on your data model, you could define another property, gamesDiff that you set to gamesP1 - gamesP2 whenever you update an entity. Then you can write the query as:
SELECT * FROM Match WHERE gamesDiff > 0
If you're using Python, check out ndb's ComputedProperty which makes this easy.
I am new to GAE, please excuse for being naive.
datastore viewer query with where clause returns "No results in Empty namespace.".
For instance:
select * from GaeUser
returns all the entires.
Something like,
select * from GaeUser where firstName = 'somename'
or
select * from GaeUser where dayOfBirth = 5
returns nothing but the message No results in empty namespace.
I am expecting some pointers on how to debug this.
Thanks for reading this!!
Simply you just wrote an incorrect/misspelled query.
Note that GAE datastore is schema-less. Writing a query for a nonexisting entity or for a nonexisting property or specifying a filter condition where you use an incorrect data type will not result in error but rather in an empty result.
Being schema-less also means that 2 entities of the same kind might have the same property with different types. For example you might have a Person entity with an age property of type int and another Person with an age property of type String. Obviously in this case if you write something like
select * from Person where age='5'
will not return the person who has age=5 property having int type.
So just simply double check the names and types of the entity and properties and try again.
Another important note:
Properties are indexed by default. This means when saving an entity, index records for an indexed property will automatically be created and saved, this allows you to find this entity by this indexed property. Properties can be made unindexed. When you save an entity with an unindexed property, index records will not be saved (or if there were any, they will be removed) for this unindexed property and you will not be able to query/find this entity by this unindexed property.
if i have a field in my table that i want to verify exists, how do i use the contains method to determine if it exists.
i would have thought the contains method just takes in a string but it seems to take in my whole linq data object
Contains is an extension method for IEnumerable that determines whether a given object is present in the enumerable. That's not what you want here.
I'm guessing that you have a LINQ query like this:
IEnumerable<string> productNames = from p in db.Products select p.ProductName;
And now you want to verify that the ProductName field actually exists to avoid run-time errors. There is actually no need to check that. Try replacing p.ProductName by a field that doesn't exist. The compiler will complain.
Of course, this assumes that the actual database schema matches the one used to generate the database class with MSLinqToSQLGenerator.
Not sure how to do it with LINQ but you could do:
SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE _NAME ='MyTable' and COLUMN _NAME='MyColumn'
then based on the count returned from the query you will know if the column exists or not.