I am learning this example:
https://github.com/neo4j-examples/movies-java-spring-data-neo4j
In this MovieRepository, this is the path setting:
collectionResourceRel = "movies", path = "movies".
Then why does the query have to contain a 'search' string:
// JSON object for single movie with cast
curl http://localhost:8080/movies/search/findByTitle?title=The%20Matrix
I thought it should be "curl http://localhost:8080/movies/findByTitle?title=The%20Matrix" without "search" in the http request. In all the files, I can't find any trace of "search". How does this happen?
#RepositoryRestResource(collectionResourceRel = "movies", path = "movies")
public interface MovieRepository extends PagingAndSortingRepository<Movie, Long> {
Movie findByTitle(#Param("title") String title);
Collection<Movie> findByTitleLike(#Param("title") String title);
#Query("MATCH (m:Movie)<-[r:ACTED_IN]-(a:Person) RETURN m,r,a LIMIT {limit}")
Collection<Movie> graph(#Param("limit") int limit);
}
This is described in the Spring Data REST documentation
To have your results sorted on a particular property, add a sort URL
parameter with the name of the property you want to sort the results
on. You can control the direction of the sort by appending a , to the
the property name plus either asc or desc. The following would use the
findByNameStartsWith query method defined on the PersonRepository for
all Person entities with names starting with the letter "K" and add
sort data that orders the results on the name property in descending
order:
curl -v "http://localhost:8080/people/search/nameStartsWith?name=K&sort=name,desc"
Related
So, I've already done this using the standard Spring Data JPA interface which extends PagingAndSortingRepository in order to achieve pagination and sorting for a REST API. The thing is, now I want to achieve the very same thing but now using just vanilla JPA and so far so good I managed to get my API to paginate but the sorting doesn't work at all. Every time I try to set the parameter (from a pageable object using pageable.getSort()) it ends with a query error (either if I just send a string as parameter like "name" or just send the sort object, it shows errors).
Here's some code:
My repo implementation:
#Override
public List<Project> findByAll(Pageable pageable) {
Query query = em.createQuery("SELECT project FROM Project project ORDER BY :sort");
query.setParameter("sort", pageable.getSort());
query.setMaxResults(pageable.getPageSize());
query.setFirstResult(pageable.getPageSize() * pageable.getPageNumber());
return query.getResultList();
}
My service:
#Override
public Page<Project> findAll(Pageable pageable) {
objects = Lists.newArrayList(repository.findByAll(pageable));
PageImpl<Project> pages= new PageImpl<Project>(objects, pageable, repository.count());
return pages;
}
To be clear, I'm filling the Pageable object via URI and from the console I can say it's actually getting the data, so I assume the problem is with the repo.
Edit: This is the error I get when I replace the setParameter("sort", ...) for a hardcoded string aka query.setParameter("sort", "name"):
java.lang.NumberFormatException: For input string: "name"
And I think this method should stand for strings as well. If I use query.setParameter("sort", pageable.getSort()), the error is the same.
The order by cannot be set as a query parameter. Also, the Pageable.getSort().toString() likely won't return a string suitable for use in an order by clause as it will result in a String that represents the Order as property: ORDER, note the colon.
Here are some modifications that will work, assuming Java 8...
String order = StringUtils.collectionToCommaDelimitedString(
StreamSupport.stream(sort.spliterator(), false)
.map(o -> o.getProperty() + " " + o.getDirection())
.collect(Collectors.toList()));
Query query = em.createQuery(
String.format("SELECT project FROM Project project ORDER BY %s", order));
I have two objects.
[DataContract]
public class Record
{
[DataMember]
public string Id { get; set; }
}
And this class:
public class BatteryStatus : Record
{
[DataMember]
public DateTime RetrieveTime { get; set; }
}
I'm using Lite DB as a local NoSQL option to query and save the data. I'm needing to find and delete the values based after some time. Here's my code doing so:
var col = db.GetCollection<BatteryStatus>(CollectionName);
var test = col.FindAll()
.Where(x => x.Id == status.Id).ToList();
var result = col.Find(Query.EQ("Id", status.Id.ToString())).ToList();
Test returns with the with the object, but the result value doesn't. Lite DB only uses the Query or the BSONId as a way to delete an object. I don't have a BSON id attached to it (it's a referenced definition so I can't change it).
How can I use the "Query" function in order to get a nested value so I can delete it?
Classes has properties, BSON documents has fields. By default, LiteDB convert all property names to same name in BSON document except _id field which is document identifier.
If you want query using Linq, you will use properties expressions. If you are using Query object class, you must use field name.
var result = col.FindById(123);
// or
var result = col.FindOne(x => x.Id == 123);
// or
var result = col.FindOne(Query.EQ("_id", 123));
Find using _id always returns 1 (or zero) document.
I figured out the problem with LiteDB, since I was using the property name of "Id", the BSON interpreted that as the "_id" of the JSON object, and merging their two values. I solve the issue by renaming the "Id" property to something else.
Trying to search for users details by using userid,emailid,firstname,lastname,GUID,etc...many more values that need to be added in future
The search should be performed using all the attributes which are not null.
Found this piece of code online *
String filter = "(&(sn=YourName)(mail=*))";
*
Is there any other predefined template or such to do the search, more optimal way without directly specifying values to be Null or using if else statements for each and every attribute? All values must be passed to the method and those not null must be used for search using LDAP. Anything? Please help.
You can effectively use the Filters at run time to specify what to use for search and what not depending on some rules or your NULL validations on attributes. Pls find sample code which fetches person name using filters in ldapTemplate :-
public static final String BASE_DN = "dc=xxx,dc=yyy";
private LdapTemplate ldapTemplate ;
public List getPersonNames() {
String cn = "phil more";
String sn = "more";
AndFilter filter = new AndFilter();
filter.and(new EqualsFilter("objectclass", "person"));
filter.and(new EqualsFilter("sn", sn));
filter.and(new WhitespaceWildcardsFilter("cn", cn));
return ldapTemplate.search(
BASE_DN,
filter.encode(),
new AttributesMapper() {
public Object mapFromAttributes(Attributes attrs)
throws NamingException {
return attrs.get("cn").get();
}
});
}
As name suggests the AndFilters joins all individual filters used in lookup like EqualFilter which checks for equality of attributes while WhitespaceWildcardsFilter to perform wildcard search. So here like we got cn = phil more, it in turn uses *phil*more* for search.
I have a problem with sliced access to some #DBRef field in my model. I use spring-data-mongodb-1.8.0.M1.jar
The model is like:
class Model {
....
#DBRef
List<OtherModel> members;
...
}
and I need sliced access to the members variable.
I use this query:
ObjectId objectId = new ObjectId("55c36f44f359d8a455a21f68");
Query query = new Query(Criteria.where("_id").is(objectId));
query.fields().slice("members", pageable.getOffset(), pageable.getPageSize());
List<Model> models = mongoTemplate.findOne(query, Model.class);
But I get this exception:
org.springframework.data.mapping.model.MappingException: No id property found on class class [Ljava.lang.Integer;
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createDBRef(MappingMongoConverter.java:842)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.toDBRef(MappingMongoConverter.java:329)
at org.springframework.data.mongodb.core.convert.QueryMapper.createDbRefFor(QueryMapper.java:460)
at org.springframework.data.mongodb.core.convert.QueryMapper.convertAssociation(QueryMapper.java:417)
at org.springframework.data.mongodb.core.convert.QueryMapper.convertAssociation(QueryMapper.java:378)
at org.springframework.data.mongodb.core.convert.QueryMapper.getMappedKeyword(QueryMapper.java:257)
at org.springframework.data.mongodb.core.convert.QueryMapper.getMappedObjectForField(QueryMapper.java:200)
at org.springframework.data.mongodb.core.convert.QueryMapper.getMappedObject(QueryMapper.java:123)
at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate.java:1647)
at org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:563)
at org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.java:558)
where a field
boolean needsAssociationConversion = property.isAssociation() && !keyword.isExists();
is set. It checks against isExists, but not against something like isSliced (which does not yet exist) and therefore is evaluated to true and, as a cause, tries to convert the non-existing association which is, in this case, just the slice-directive (an integer array). When I set the variable needsAssociationConversion to false while debugging, as if a kind of keyword.isSlice() check was done, everything works fine.
Is this a bug?
Executable project is here
https://github.com/zhsyourai/sliceDemo
My query parameter is like this:
q=name:abc+age:20+roleid:(23|45)|audeince:(23|24).Here + is for AND | is for OR
I have to accept this query param as it is into my spring controller and have to make query to solar to fetch the data.

#Controller
#RequestMapping("/user")
public class BooksController {
#RequestMapping(value="/details", method=RequestMethod.GET)
public ResponseEntity<?> getUser(final HttpServletRequest request) {
String params = requestParams.get("q")[0];
//passing this string to make query in apache solar
}
}
I need to write a parser to split the param value to make a solar query.how to write a query parser to split the above url to make solar query satisfying OR AND condition.name:abc+age:20+roleid:(23|45)|audeince:(23|24) means create a solar query where name=abc and age=20 and roleid in (23,24) or audience in (23,24) .This way user sends query.
Eg:firstName:(abc|bcd)+lastName:abc+emailId:abc+dsID:abc|countryCd:US+audienceId:(123+678)
first using regex convert like this
firstName:(abc|bcd)+ -----------segment1
lastName:abc+.............segment2
emailId:abc+.............segment3
dsID:abc|--------------segment4
countryCd:US+----------segment5
audienceId:(123+678)------segment 6;
like many segments may come in the url
i have a class called
class Queryobj{
private String field;
private List value;
private String internalOperator;
private String externalOperator;
}
firstName:(abc|bcd)+ again using regex map Like this
field=firstName
value={abc,bcd}
internalOperator=|
externalOperator=+
like second segment emailId:abc+
field=emailId
value=abc
internalOperator=null
externalOperator=+
same for other segments also .if there are n segments we have n objects.
After that add each object to Linked List.if internalOperator or externalOperator is null then leave it as null .How can I achieve that
You can use this regex pattern to get "key:value operator" segment
Pattern keyValuePattern = Pattern.compile("[\\w]+:([\\w#.]+|\\([\\w|+#.]+\\))[+|]?");