Hello I am trying to put a query member as an filter condition and the code I am trying to do is :
Member [ThisMonth] as VBAMDX.Format(VBAMDX.Now(),"yyyyMM")
SET [currentdays] AS filter([D Date].[DAY ID].Members,
[D Date].[MONTH ID]=[ThisMonth])
But The query did not recognize the Condition
Member [ThisMonth] as VBAMDX.Format(VBAMDX.Now(),"yyyyMM")
SET [currentdays] AS filter([D Date].[DAY ID].Members,
[D Date].[MONTH ID].&[201309])
The query therefore then return the desire result. I am just wondering is there anymore dynamic way to do this?
Thank you very much!
VBAMDX.Format(VBAMDX.Now(),"yyyyMM") returns a string, not a member identifier. This is like in SQL select 'myColumn' from myTable which returns the literal string ´myColumn´ and not the contents of column mycolumn.
If you want to use the Format function, then you firstly need to construct the full unique name of the member, and secondly convert the string to a member identifier using StrToMember:
Member [ThisMonth] as '[D Date].[MONTH ID].&['
+ VBAMDX.Format(VBAMDX.Now(),"yyyyMM")
+ ']' -- this returns a string!
SET [currentdays] AS filter([D Date].[DAY ID].Members,
StrToMember([ThisMonth]))
By the way: You do not need Filter here, and it can slow down queries dramatically, you can just use
SET [currentdays] AS { StrToMember([ThisMonth]) }
Related
I'm trying to use whereExists() on an existing Eloquent query builder (called $trips):
$trips = $trips->whereExists(function ($query) use ($filterValue) {
$query->from(DB::raw("jsonb_array_elements(passengers->'adults'->'persons') as p(person)"))
->whereRaw("p.person->>'name' LIKE '?%'", $filterValue);
});
The query I'm trying to create in raw postgres format is the following (this query works fine using pgAdmin):
SELECT *
from trips
WHERE exists (select *
from jsonb_array_elements(passengers -> 'adults' -> 'persons') as p(person)
where p.person ->> 'name' LIKE 'Prof%');
And I'm receiving this error:
Invalid parameter number: parameter was not defined
I think the problem is small, but I can't see it myself.
The parameter definition in your whereRaw() statement is not quite correct. Parameterized queries are not just string replacements. Your query as written doesn't have a parameter in it, it has a string literal of '?%'. You need to change this to a query parameter, and append the % wildcard to the string you pass in.
Try this:
->whereRaw("p.person->>'name' LIKE ?", $filterValue.'%')
I have a cosmos db collection. I need to query all documents and return them in order of creation date. Creation date is a defined field but for historical reason it is in string format as MM/dd/yyyy. For example: 02/09/2019. If I just order by this string, the result is chaos.
I am using linq lambda to write my query in webapi. I have tried to parse the string and try to convert the string. Both returned "method not supported".
Here is my query:
var query = Client.CreateDocumentQuery<MyModel>(CollectionLink)
.Where(f => f.ModelType == typeof(MyModel).Name.ToLower() && f.Language == getMyModelsRequestModel.Language )
.OrderByDescending(f => f.CreationDate)
.AsDocumentQuery();
Appreciate for any advice. Thanks. It will be huge effort to go back and modify the format of the field (which affects many other things). I wish to avoid it if possible.
Chen Wang.Since the order by does not support derived values or sub query(link),so you need to sort the derived values by yourself i think.
You could construct the MM/dd/yyyy to yyyymmdd by UDF in cosmos db.
udf:
function getValue(datetime){
return datetime.substring(6,10)+datetime.substring(0,2)+datetime.substring(3,5);
}
sql:
SELECT udf.getValue(c.time) as time from c
Then you could sort the array by property value of class in c# code.Please follow this case:How to sort an array containing class objects by a property value of a class instance?
I need to write a query in such way that the array(collection) is contain only sub query objects.
Suppose we have the two tables as follows:
TableA:
objectId, name
TableB:
objectId, names[array of name: parse pointer collection]
Here is my code which I tried:
// sub query
var subQuery = new Parse.Query('TableA');
subQuery.doesNotExist('name');
// main query
var query = new Parse.Query('TableB');
query.exists("names");
//query.containsAll("names", subQuery); // this means names should contain all subQuery, so this is not use full for me.
query.matchesQuery("names", subQuery);
This code is running fine, but this is not working as I want and also not showing the any error.
It seems that you don't need a subquery per se, but rather to first query your list of names, and then use that in your main query. What you seem to be looking for is: containedIn( key, values ) , as in:
query.containedIn("name", namesFromFirstQuery)
I'm hoping this is a simple solution. I have a field (PressType) in a table (Stocks) that is seed populated by using an Enum. The table stores the data as an integer. However when I want to query some data via Linq it gives me issues. I can filter any other fields in the table using this format however on the Enum populated field it says
the "==" operator cannot be applied to operands of type "Models.PressType" and "string".
Any help you could give would be appreciated, thanks.
var test = db.Stocks.Where(x => x.PressType == myValue);
There is nothing wrong with your Linq. Your problem is that myValue is of type string. You need to convert your string to the enum first.
string myValue = SomeControl.Text;
Models.PressType myValueAsEnum = (Models.PressType)
Enum.Parse(typeof(Models.PressType), myValue);
IQueryable<Stock> test = db.Stocks.Where(x => x.PressType == myValueAsEnum);
What does the keyword "value" mean in this statement, and where would I go to learn more?
What happens if I leave out the keyword "value"? In the code below, z is an entity framework class.
string queryString = "SELECT VALUE q from x.zs as q where q.a = #parm;"
ObjectQuery<z> query = context.CreateQuery<z>
(queryString, new ObjectParameter("parmname",parmvalue));
return query.First();
(This is a part of a practice question for an exam).
The above code is in a function that returns a variable of type z.
That is Entity SQL syntax. Value keyword allows only one value to be specified, and does not add a row wrapper.
Read article about SELECT statement in ESQL
Entity SQL supports two variants of the SELECT clause. The first
variant, row select, is identified by the SELECT keyword, and can be
used to specify one or more values that should be projected out.
Because a row wrapper is implicitly added around the values returned,
the result of the query expression is always a multiset of rows.
Each query expression in a row select must specify an alias. If no
alias is specified,Entity SQL attempts to generate an alias by using
the alias generation rules.
The other variant of the SELECT clause, value select, is identified by
the SELECT VALUE keyword. It allows only one value to be specified,
and does not add a row wrapper.
So, if you want to materialize z object from your query, you should use SELECT VALUE syntax (otherwise you will get exception: cast from MaterializedDataRecord to z type is not valid).
Without VALUE keyword you will get set of rows:
string esql = "SELECT q from x.zs as q where q.a = #parm;";
ObjectQuery<DbDataRecord> query = context
.CreateQuery<DbDataRecord>(esql, new ObjectParameter("parm",parmvalue));
var result = query.First();