Exple :
I have a result like this
Result1 AFTER EMIT:
Key-------------------------------value
"2014/10/31" ----------------- {"A":a}
"2014/10/31" ----------------- {"B":b}
"2014/10/31"----------------- {"C":c}
"2014/10/31"----------------- {"D":d}
How can I output this new result from the previous one:
Key-------------------------value
"2014/10/31" -----------------{"Array":["A":a, "B":b, "C":c, "D":d]}
Is there a way? Any help will be appreciated. Thanks
You can use Couchbase v3 new N1QL query language for that. Also there is Query Language Tutorial. Specifically Array Comprehensions syntax.
I found it . Just do : group = true in the path or select it from the filter result .
and a reduce function to return all the values from the map. also you can add the start key = "2014/10/31" and end key= "2014/10/31".
Related
How to add condition dynamically to sql query
for example if i have one element than it will look like
query=['one_element']
User.where('name LIKE ?, %"#{query[0]}"%')
but if it more than one
User.where('name LIKE ? and LIKE ? and Like... , %"#{query}"%', ..so on)
Im use myslq
so my main goal to split search query if it contains more than 2 words and search by them separately in one sql query
not where(name:'john dou') but where(name:'john' and name:'dou')
If you have a version of MySQL that supports RLIKE or REGEXP_LIKE:
User.where("RLIKE(name, :name_query)", name_query: query.join("|"))
Otherwise, you'll have to manually build with the ActiveRecord or operator:
# In the User model
scope :name_like, ->(name_part) {
return self.all if name_part.blank?
where("name LIKE :name_query", name_query: "%#{name_part}%")
}
scope :names_like, ->(names) {
relation = User.name_like(names.shift)
names.each { |name| relation = relation.or(name_like(name)) }
relation
}
Then you can pass it an array of any name partials you want:
query = ["john", "dou"]
User.names_like(query)
First split the word by it's separator like this query.split(' ') this will give you array of words. Then you can use like below in rails.
User.where(name: ['John', 'dou']
I have in my bucket a document containing a list of ID (childList).
I would like to query over this list and keep the result ordered like in my JSON. My query is like (using java SDK) :
String query = new StringBuilder().append("SELECT B.name, META(B).id as id ")
.append("FROM" + bucket.name() + "A ")
.append("USE KEYS $id ")
.append("JOIN" + bucket.name() + "B ON KEYS ARRAY i FOR i IN A.childList end;").toString();
This query will return rows that I will transform into my domain object and create a list like this :
n1qlQueryResult.allRows().forEach(n1qlQueryRow -> (add to return list ) ...);
The problem is the output order is important.
Any ideas?
Thank you.
here is a rough idea of a solution without N1QL, provided you always start from a single A document:
List<JsonDocument> listOfBs = bucket
.async()
.get(idOfA)
.flatMap(doc -> Observable.from(doc.content().getArray("childList")))
.concatMapEager(id -> bucket.async().get(id))
.toList()
.toBlocking().first();
You might want another map before the toList to extract the name and id, or to perform your domain object transformation even maybe...
The steps are:
use the async API
get the A document
extract the list of children and stream these ids
asynchronously fetch each child document and stream them but keeping them in original order
collect all into a List<JsonDocument>
block until the list is ready and return that List.
I have this queries:
select otherDocKey from bucket use keys '1234'
update bucket use keys 'hear I need the result of the first query' set ...
I want to do something like that:
update bucket use keys (select otherDocKey from bucket use keys '1234') set kuku = 3
but the response I get is:
[
{
"code": 5030,
"msg": "Missing or invalid primary key map[otherDocKey:\"56443\"] of type map[string]interface {}."
}
]
is there a way to do that in one query?
I am using couchbase version 4.5
The problem with your query is that the nested subquery returns a json result. I.e., the query:
select otherDocKey from bucket use keys '1234'
will return a result that looks like:
{"otherDocKey":"This_is_the_key_for_the_other_doc"}
But you don't want json, you just want the value from the json. For that you need to use 'select raw'. E.g.,
select raw otherDocKey from bucket use keys '1234'
That should give you a result that looks like:
["This_is_the_key_for_the_other_doc"]
When the subquery returns that kind of result, the "use keys" should work properly.
I have an issue in finding the correct records from the database. This is my query:
#interested_individual = Profile.where('category_id = ?', #event.interests).all
Where category_id is the column in the profiles table what holds the integer value and #event.interests returns an array that is ["1", "2", "3"]
What I want here is to fetch all the profiles where its category_id is present in the #event.interests array.
Please let me know the solution. Thanks in advance
You don't really need to manually write the binding with ? and all.
Try this:
#interested_individual = Profile.where(category_id: #event.interests).all
Active Record will then turn that into category_id IN (?) for you if you pass in an array.
This query will translate to category_id IN [interest_ids...]
Profile.where(category_id: #event.interests).all
You were close. Use IN.
#interested_individual = Profile.where('category_id IN (?)', #event.interests).all
But, I would suggest find you here, if you are only wanted to get collection of all Profile records :
#interested_individual = Profile.find(#event.interests)
I'm pretty new to HADOOP and pig .
So . I have a single line json files , all have the same schema :
{"name":"someName","pkg":[{"F1":"abc","F2":"44","F3":"xyz","F4":1024,"info":
[{"timestamp":1372631550000,"value":"122","id":"nnn","name":"ppp"},
{"timestamp":1372649240000,"value":"222","id":"ggg","name":"qqq"}]} ,
{"F1":"abc","f2":"44","F3":"xyz","F4":1024,"new":[{"type":"event1", "time":1372537000000,"more":"
{\"bbad\":\"HELLO\",\"is_done\":0,\"ssss\":-128}"}]}]}
I load all of the json files using elephantbird :
data = LOAD 'browsers/gzip' USING com.twitter.elephantbird.pig.load.JsonLoader('-nestedLoad') as (json:map[]);
So far the only thing that working for me is querying the "name" field which returns bytearray.
b = foreach data generate json#'name' as name
I then tries to convert it to map instead :
c = FOREACH data GENERATE json#'name' as (m:map[]);
DESCRIBE c;
and get
c: {tuple_0: (m:map[])}
and the data looks like :
({([F1#"abc",F2#44...])})
so now I need to filter all the ones that have pkg.F1 = "abc" or all the ones that have pkg.info.value = 122 etc.
how do I do it?
a code example will be very helpful as I already googled it a lot.
Thanks
Try this
c = FOREACH data GENERATE flatten(json#'name') as (m:map[]);
The problem is that you don't know how your data is organized in Pig. Use
DESCRIBE data;
to find out what the structure returned by JsonLoader is, and this should give you enough information about how to extract your data.