I have an API I am pinging which queries a cosmos db to return records.
I can filter on a simple string in my api call like so:
// return objects where '_Subject' field equals "filterTest"
string getUrl = $"...baseApiPath/?$filter=_Subject+eq+'filterTest'";
This is working perfectly.
But I cannot figure out the filter syntax to make my API query be based on ARRAY_CONTAINS.
// return objects where '_Attachments' field CONTAINS "945afd138aasdf545a2d1";
How would I do that? Is there a general reference for API filter syntax somewhere?
If you're asking about how to query, a query against a property with an array of values looks like this:
SELECT * FROM c WHERE ARRAY_CONTAINS(c._Attachments, "945afd138aasdf545a2d1")
Another example in this answer.
Related
New to SQL, I am writing as an exercise an API middleware that checks if the information contained in some headers match a database entry ("token-based authentication"). Database access is based on GORM.
To this, I have defined my ORM as follows:
type User struct {
ID uint
UserName string
Token string
}
In my middleware I retrieve the content of relevant headers and end up with the variables userHeader and tokenHeader. They are supposed to be matched to the database in order to do the authentication.
The user table has one single entry:
select * from users
// 1,admin,admintoken
The authentication code is
var auth User
res := db.Where(&User{UserName: userHeader, Token: tokenHeader}).Find(&auth)
if res.RowsAffected == 1 {
// authentication succeeded
}
When testing this, I end up with the following two incorrect results (other combinations are correct):
with only one header set to a correct value (and the other one not present) the authentication is successful (adding the other header with an incorrect value is OK (=auth fails))
no headers set → authentication goes though
I expected my query to mean (in the context of the incorrect results above)
select * from users where users.user_name = 'admin' and users.token = ''
select * from users where users.user_name = '' and users.token = ''
and this query is correct on the console, i.e. produces zero results (ran against the database).
The ORM one, however, seems to discard non-existing headers and assume they are fine (this is at least my understanding)
I also tried to chain the Where clauses via
db.Where(&User{UserName: userHeader}).Where(&User{Token: tokenHeader}).Find(&auth)
but the result is the same.
What should be the correct query?
The gorm.io documentation says the following on the use of structs in Where conditionals:
When querying with struct, GORM will only query with non-zero fields,
that means if your field’s value is 0, '', false or other zero
values, it won’t be used to build query conditions ...
The suggested solution to this is:
To include zero values in the query conditions, you can use a map,
which will include all key-values as query conditions ...
So, when the token header or both headers are empty, but you still want to include them in the WHERE clause of the generated query, you need to use a map instead of the struct as the argument to the Where method.
db.Where(map[string]interface{}{"user_name": userHeader, "token": tokenHeader}).Find(&auth)
You can use Debug() to check for the generated SQL (it gets printed into stderr); use it if you are unsure what SQL your code generates
I am starting to dabble in CI4's rc... trying to get a head of the game. I noticed that the Model is completely rewritten.
Going through their documentation, I need some guidance on how to initiate the equivalent DB query builder in CI4.
I was able to leverage return $this->findAll(), etc...
however, need to be able to be able to query w/ complex joins and also be able to return single records etc...
When trying something like
return $this->orderBy('import_date', 'desc')
->findColumn('import_date')
->first();
but getting error:
Call to a member function first() on array
Any help or guidance is appreciated.
Suppose you have a model instantiated as
$userModel = new \App\Models\UserModel;
Now you can use it to get a query builder like.
$builder = $userModel->builder();
Use this builder to query anything for e.g.
$user = $builder->first();
Coming to your error.
return $this->orderBy('import_date', 'desc')
->findColumn('import_date');
findColumn always returns an array or null. So you can't use it as object. Instead you should do following.
return $this->orderBy('import_date', 'desc')->first();
Using Postman, I am forming a GET request query to my P21 database middleware to retrieve items with a specific value in a UserDefinedField.
I am able to query things on the top level of the item data, such as ItemID and ItemDesc like so:
http://[server]:[port]/api/inventory/parts?$query=ItemDesc eq 'CONTROL VALVE'
However, the values I would like to use in my query string are nested inside the UserDefinedFeilds element. I am specifically looking for items with:
http://[server]:[port]/api/inventory/parts?$query=UserDefinedFeilds/OnEbay eq 'Y'
But this is not the correct way to form this query string. Can anyone please explain how to specify a nested element inside a query string like this? Thanks.
In this situation, using P21 API, it is unnecessary to specify the parent field 'UserDefinedFields'. The actual ID of the column I was looking for was actually 'on_ebay', so I was able to query this user defined field simply:
http://[server]:[port]/api/inventory/parts?$query=on_ebay eq 'Y'
I have a Linq Query made into a list called "ticket query"
I want to search ticket query for all the records that have specific data
I tried using FindAll() but it gives me an error
Argument matching parameter 'match' cannot convert from
'VB$AnonymousDelegate_1(Of JobPartForm,Nullable(Of Boolean))' to
'Predicate(Of JobPartForm)'.
I can't do the findall directly in the query because its being called at a separate time
is there another way to accomplish this, or am I using find all wrong?
ticketquery = (From ticket In dbContext.JobPartForm
Select ticket).ToList()
Dim formticket = ticketquery.FindAll(Function(f As JobPartForm) f.JobNum = ticketnum And f.FormNumber = formnum)
You can do the same using IQueryable<TSource>.Where method:
Dim formticket=dbContext.JobPartForm.Where((Function(f As JobPartForm) f.JobNum = ticketnum And f.FormNumber = formnum)).ToList();
The first thing is try to never call ToList extension method from a DbSet, that will load your entire table to memory, is really inefficient and more when you can filter your data on the server side.
I am using the clientAPI to query an index (Cards) in RavenDB so:
Dim cards = Raven.CurrentSession.Query(Of Cards)("Cards").ToArray()
This works well and returns all the documents, but how can I get the ID of the documents it returns?
Eystein,
for each of the returned cards, you do
Raven.CurrentSession.Advanced.GetDocumentId(card)