I have a Oracle query and would like to transform into Marklogic cts query. It looks like Marklogic CTS doesn't allow to have "and-query" inside of "and-query". I am not sure how Marklogic works. Thanks in advance.
Where clause query:
where (collection = "TRBA" AND fulltext = 1
AND (dnta = "Briefing" OR dnta = "Conference" OR snta = "Workshop"
OR snta = "Published in" AND (snta = "this article" OR dnta = "Journal")
)
AND (cand IN ("Research","Development Center") OR scn IN("424778","98814","393825"))
Translate into Marklogic:
let $uris:= cts:uris(
(),
(),
cts:and-query((
cts:collection-query("/dbs/"TRBA"),
cts:element-value-query(xs:QName("meta:FullTextExists"),"1"),
cts:field-word-query("dnta",("briefing","conference")),
cts:or-query((
cts:element-word-query(xs:QName("meta:snta"),("this article")),
cts:field-word-query("dnta",("Journal")),
cts:and-query((
cts:or-query((
cts:field-word-query("cand", ("Research","Development Center"))
cts:field-word-query("scn",("424778","98814","393825"))
))
))(:inside and-query:)
))(:or-query:)
))(:outside and-query:)
return fn:doc($uris)
There are basic syntax errors in your code above: missing parens, extra double quotes
I don't think you want word query as the translation for "="; word query just says that word appears somewhere in the field in question; I would think that would be a value query instead.
You might want to take a look at cts:parse which takes a string with ANDs and ORs etc. plus bindings for fields and parses a query string into a cts:query
That said, if you assume the AND mixed in with the ORs binds to the closest clause, i.e. as parenthesized so:
(collection = "TRBA" AND
fulltext = 1 AND
(dnta = "Briefing" OR
dnta = "Conference" OR
snta = "Workshop" OR
(snta = "Published in" AND (snta = "this article" OR dnta = "Journal"))
) AND
(cand IN ("Research","Development Center") OR
scn IN ("424778","98814","393825"))
then I would translate this something like this:
cts:and-query((
cts:collection-query("/dbs/TRBA"),
cts:element-value-query(xs:QName("meta:FullTextExists"),"1"),
cts:or-query((
cts:field-value-query("dnta",("Briefing","Conference")),
cts:field-value-query("snta","Workshop"),
cts:and-query((
cts:field-value-query("snta","Published in"),
cts:or-query((
cts:field-value-query("snta","this article"),
cts:field-value-query("dnta","Journal")
))
))
)),
cts:or-query((
cts:field-value-query("cand",("Research","Development Center")),
cts:field-value-query("scn",("424778","98814","392825"))
))
))
It is a pretty direct mapping.
You simply have several typos in your code. There's an extra double quote in the collection-query and you're missing a comma between items in the last or-query.
Once fixing those the code will run. But a pro tip: don't ever fetch URIs only to fetch documents. You're wasting effort. Just fetch the documents directly with a search passing the query.
let $q := cts:and-query((...))
return cts:search(doc(), $q)[1 to 10]
You probably want to add a limit like [1 to 10] as well unless you really intend to return the full result set.
Related
I need a searching process on linq like this. For example, I will make searching on Name column,and user enters "Ca?an" word to textbox. Question mark will e used for sprecial search character for this sitution.
It will search by Name column and, find Canan,Calan,Cazan etc.
I hope I can explain my problem correctly.
Can anyone give me an idea about this linq query. Thank in advance...
You can use this regular expression (if you are using C#) to check for the "Ca?an".
string d = "DDDDDDDDDDCasanDDDDDDDDDD";
Regex r = new Regex(#"Ca([a-zA-Z]{1})an");
string t = r.Match(d).Value;
Output will be:
"Casan"
You have all your colum stored in a database, then do something like:
List<Person> list = new List<Person>(); //Filled
var res = list.Select(x => r.Match(x.Name));
Output will be a IEnumerable with all the "Persons" who contains in the Name "Ca?an", being ? no matter which letter
You need to convert your search-syntax into an existing search-engine - I'd suggest Regex. So the steps will be:
Safely convert the entered search-string into Regex-pattern
Perform the search in Linq on name-property
Solution:
1: Safely convert search string by replacing '?' with Regex-version of wildchar:
var userInput = "Ca?an";
var regexPattern = Regex.Escape(userInput).Replace(#"\?", ".");
2: Perform search in Linq (assuming itemList implements IEnumerable):
var results = itemList.Where(item => Regex.IsMatch(item.Name, regexPattern));
Hope this helps!
I need a Linq statement that will select all from a table where a field contains all elements in a list<String> while searching other fields for the entire string regardless of words.
It's basically just a inclusive word search on a field where all words need to be in the record and string search on other fields.
Ie I have a lookup screen that allows the user to search AccountID or Detail for the entire search string, or search clientID for words inclusive words, I'll expand this to the detail field if I can figure out the ClientId component.
The complexity is that the AccountId and Detail are being searched as well which Basically stops me from doing the foreach in the second example due to the "ors".
Example 1, this gives me an the following error when I do query.Count() afterwards:
query.Count(); 'query.Count()' threw an exception of type 'System.NotSupportedException' int {System.NotSupportedException}
+base {"Local sequence cannot be used in LINQ to SQL implementations of query operators except the Contains operator."} System.SystemException {System.NotSupportedException}
var StrList = searchStr.Split(' ').ToList();
query = query.Where(p => p.AccountID.Contains(searchStr) || StrList.All(x => p.clientID.Contains(x)) || p.Detail.Contains(searchStr));
Example 2, this gives me an any search word type result:
var StrList = searchStr.Split(' ').ToList();
foreach (var item in StrList)
query = query.Where(p => p.AccountID.Contains(searchStr) || p.clientID.Contains(item) || p.Detail.Contains(searchStr));
Update
I have a table with 3 fields, AccountID, ClientId, Details
Records
Id, AccountID, CLientId, Details
1, "123223", "bobo and co", "this client suxs"
2, "654355", "Jesses hair", "we like this client and stuff"
3, "456455", "Microsoft", "We love Mircosoft"
Search examples
searchStr = "232"
Returns Record 1;
searchStr = "bobo hair"
Returns no records
searchStr = "bobo and"
Returns Record 1
searchStr = "123 bobo and"
Returns returns nothing
The idea here is:
if the client enters a partial AccountId it returns stuff,
if the client wants to search for a ClientId they can type and cancel down clients by search terms, ie word list. due to the large number of clients the ClientID Will need to contain all words (in any order)
I know this seems strange but it's just a simple interface to find accounts in a powerful way.
I think there are 2 solutions to your problem.
One is to count the results in memory like this:
int count = query.ToList().Count();
The other one is to not use All in your query:
var query2 = query;
foreach (var item in StrList)
{
query2 = query2.Where(p => p.clientID.Contains(item));
}
var result = query2.Union(query.Where(p => p.AccountID.Contains(searchStr) || p.Detail.Contains(searchStr)));
The Union at the end acts like an OR between the 2 queries.
I am trying to select some records using LINQ for Entities (EF4 Code First).
I have a table called Monitoring with a field called AnimalType which has values such as
"Lion,Tiger,Goat"
"Snake,Lion,Horse"
"Rattlesnake"
"Mountain Lion"
I want to pass in some values in a string array (animalValues) and have the rows returned from the Monitorings table where one or more values in the field AnimalType match the one or more values from the animalValues. The following code ALMOST works as I wanted but I've discovered a major flaw with the approach I've taken.
public IQueryable<Monitoring> GetMonitoringList(string[] animalValues)
{
var result = from m in db.Monitorings
where animalValues.Any(c => m.AnimalType.Contains(c))
select m;
return result;
}
To explain the problem, if I pass in animalValues = { "Lion", "Tiger" } I find that three rows are selected due to the fact that the 4th record "Mountain Lion" contains the word "Lion" which it regards as a match.
This isn't what I wanted to happen. I need "Lion" to only match "Lion" and not "Mountain Lion".
Another example is if I pass in "Snake" I get rows which include "Rattlesnake". I'm hoping somebody has a better bit of LINQ code that will allow for matches that match the exact comma delimited value and not just a part of it as in "Snake" matching "Rattlesnake".
This is a kind of hack that will do the work:
public IQueryable<Monitoring> GetMonitoringList(string[] animalValues)
{
var values = animalValues.Select(x => "," + x + ",");
var result = from m in db.Monitorings
where values.Any(c => ("," + m.AnimalType + ",").Contains(c))
select m;
return result;
}
This way, you will have
",Lion,Tiger,Goat,"
",Snake,Lion,Horse,"
",Rattlesnake,"
",Mountain Lion,"
And check for ",Lion," and "Mountain Lion" won't match.
It's dirty, I know.
Because the data in your field is comma delimited you really need to break those entries up individually. Since SQL doesn't really support a way to split strings, the option that I've come up with is to execute two queries.
The first query uses the code you started with to at least get you in the ballpark and minimize the amount of data you're retrieving. It converts it to a List<> to actually execute the query and bring the results into memory which will allow access to more extension methods like Split().
The second query uses the subset of data in memory and joins it with your database table to then pull out the exact matches:
public IQueryable<Monitoring> GetMonitoringList(string[] animalValues)
{
// execute a query that is greedy in its matches, but at least
// it's still only a subset of data. The ToList()
// brings the data into memory, so to speak
var subsetData = (from m in db.Monitorings
where animalValues.Any(c => m.AnimalType.Contains(c))
select m).ToList();
// given that subset of data in the List<>, join it against the DB again
// and get the exact matches this time
var result = from data in subsetData
join m in db.Monitorings on data.ID equals m.ID
where data.AnimalType.Split(',').Intersect(animalValues).Any ()
select m;
return result;
}
I have a need to replace multiple strings with others in a query
from p in dx.Table
where p.Field.Replace("A", "a").Replace("B", "b").ToLower() = SomeVar
select p
Which provides a nice single SQL statement with the relevant REPLACE() sql commands.
All good :)
I need to do this in a few queries around the application... So i'm looking for some help in this regard; that will work as above as a single SQL hit/command on the server
It seems from looking around i can't use RegEx as there is no SQL eq
Being a LINQ newbie is there a nice way for me to do this?
eg is it possible to get it as a IQueryable "var result" say and pass that to a function to add needed .Replace()'s and pass back? Can i get a quick example of how if so?
EDIT: This seems to work! does it look like it would be a problem?
var data = from p in dx.Videos select p;
data = AddReplacements(data, checkMediaItem);
theitem = data.FirstOrDefault();
...
public IQueryable<Video> AddReplacements(IQueryable<Video> DataSet, string checkMediaItem)
{
return DataSet.Where(p =>
p.Title.Replace(" ", "-").Replace("&", "-").Replace("?", "-") == checkMediaItem);
}
Wouldn't it be more performant to reverse what you are trying to do here, ie reformat the string you are checking against rather than reformatting the data in the database?
public IQueryable<Video> AddReplacements(IQueryable<Video> DataSet, string checkMediaItem)
{
var str = checkMediaItem.Replace("-", "?").Replace("&", "-").Replace("-", " "));
return DataSet.Where(p => p.Title == str);
}
Thus you are now comparing the field in the database with a set value, rather than scanning the table and transforming the data in each row and comparing that.
Maybe a simple question, I'm trying to get a result from a table where the Name column contains all of an array of search terms. I'm creating a query and looping through my search strings, each time assigning the query = query.Where(...);. It appears that only the last term is being used, I supposed because I am attempting to restrict the same field each time. If I call .ToArray().AsQueryable() with each iteration I can get the cumlative restrinction behavior I'm looking for, but it there an easy way to do this using defered operators only?
Thanks!
If you're doing something like:
foreach (int foo in myFooArray)
{
query = query.where(x => x.foo == foo);
}
...then it will only use the last one since each where criteria will contain a reference to the 'foo' loop variable.
If this is what you're doing, change it to:
foreach (int foo in myFooArray)
{
int localFoo = foo;
query = query.where(x => x.foo == localFoo);
}
...and everything should be fine again.
If this is not what is happening, please provide a code sample of what you're doing...