I have a transaction class which stores the each transaction of a customer,Following are the fields in this class.
class Transaction{
#Id
private String id;
private Date date;
private String customerId;
private double openBalance;
private double transctionAmount;
private double finalAmount;
}
I need to fetch only the last inserted record of a customer (let say for customerId = cust123).
I defined following function in repository.
public interface TranscationRepository extends MongoRepository<Transaction, String> {
Optional<Transaction> findTopByCustomerIdOrderByIdDesc(String id);
}
This method giving last entry not by customerId but overall. I tried few modifications to it but did not get success.
I know I can findAllByCustomer but I don't want to pull huge list of transaction which is of no use in this use case. What is correct signature in spring mongo to get last inserted record by a field? I am ok to use custom #Query also.
Thank you.
I have an entity with a string field in it.
Sometimes this string field stores actual words, so sorting based on lexicographical order makes sense. However, there is a use case where this field stores string values like "0%", "10%", "100%", "20%".
The default string sorting generates the following sequence: 0% 10% 100% 20%.
The ideal sequence after sorting would be 0%, 10%, 20%, 100%(determined by the percentage they represent).
It is guaranteed that there is no mixed data, i.e, you won't have "10%" and "word" appear in the same sequence that needs to be sorted.
My question is if there is a way to achieve the string sorting based on the numerical value they represent?
Ideally, you should alter your model to have two fields: one of integer type where you'll hold the percentage, and one of string type where you will hold the string value:
#Entity
#Indexed
public class MyEntity {
#Field
#SortableField
private int percentage;
#Field
#SortableField
private String notPercentage;
// ... other properties, getters and setters ...
}
Then when sorting you'll just sort on both fields. Since you are certain they are mutually exclusive, it's not a problem to sort on both:
QueryBuilder queryBuilder = ...;
FullTextQuery ftQuery = ...;
ftQuery.sort(queryBuilder.sort().byField("percentage").andByField("notPercentage").createSort());
Alternatively, if you really want to keep a single String property in your ORM model (to each his own...), you can use a custom bridge to apply padding to your values, so that they are sorted correctly:
#Entity
#Indexed
public class MyEntity {
#Field(bridge = #FieldBridge(impl = PaddingIfPercentageBridge.class))
#SortableField
private String percentageOrNot;
// ... other properties, getters and setters ...
}
public class PaddingIfPercentageBridge implements TwoWayStringBridge {
private static final Pattern PERCENTAGE = Pattern.compile("[0-9]+%");
#Override
public String objectToString(Object object) {
if ( object == null ) {
return null;
}
String string = (String) object;
if ( !PERCENTAGE.matcher( string ).matches() ) {
return string;
}
StringBuilder paddedPercentage = new StringBuilder();
for ( int padIndex = string.length(); padIndex < 4; padIndex++ ) {
paddedPercentage.append( '0' );
}
return paddedPercentage.append( string ).toString();
}
#Override
public Object stringToObject(String stringValue) {
// Ideally you should remove the padding here...
return stringValue;
}
}
Then you can sort on a single field:
QueryBuilder queryBuilder = ...;
FullTextQuery ftQuery = ...;
ftQuery.sort(queryBuilder.sort().byField("percentageOrNot").createSort());
I have a user defined class CostMatrix this class contains two properties and data type for both properties is HashMap. I am using Morphia to communicate with mongodb so my entity class looks like this
#Entity(value = "CostMatrix",noClassnameStored = false)
public class CostMatrix {
#Id
private String id;
private HashMap<String,Double> distances;
private HashMap<String,Double> durations;
public CostMatrix(){}
public CostMatrix(String id, HashMap<String,Double>distances, HashMap<String,Double>durations) {
this.id = id;
this.distances = distances;
this.durations = durations;
}
I am unable to store object properly into database object is stored any how but when I retrieve its just returns id and class name any thoughts would be appreciated.
if you don't want to have any class/package names in your collection just put the noClassnameStored flag to true.
#Entity(value = "CostMatrix",noClassnameStored =**true**)
As for the saving part, do you fill some values into your maps? The mapper will ignore null values and empty lists.
So I started working with Morphia and I'm encountering a weird problem.
Here's my entity class
#Entity("movies")
#Indexes(#Index(value = "Name", fields = #Field("Name")))
#Converters(LocalDateConverter.class)
public class MovieDetails implements Serializable
{
#Id
public String Id;
public String Name;
public String Description;
public String ImageName;
public LocalDate ReleaseDate;
public String Director;
public int Duration;
public String Genres;
public String Actors;
public MovieDetails()
{
}
public MovieDetails(String id, String name, String description, String imageName, String director, String actors, LocalDate releaseDate, String genres, int duration)
{
this (name, description, imageName, director, actors, releaseDate, genres, duration);
Id = id;
}
public MovieDetails(String name, String description, String imageName, String director, String actors, LocalDate releaseDate, String genres, int duration)
{
Name = name;
Description = description;
ImageName = imageName;
Director = director;
Actors = actors;
ReleaseDate = releaseDate;
Genres = genres;
Duration = duration;
}
}
Here's my little test:
final Morphia morphia = new Morphia();
// tell Morphia where to find your classes
// can be called multiple times with different packages or classes
morphia.mapPackage("nimrodpasha.cinema.objects");
// create the Datastore connecting to the default port on the local host
final Datastore datastore =
morphia.createDatastore(SingleMongoClient.getInstance().getClient(),
Constants.DB.TICKET_DATABASE);
datastore.ensureIndexes();
//region new movie
MovieDetails movie = new MovieDetails("The Mask", "Stanley Ipkiss (Jim Carrey) is a bank clerk that is an incredibly nice man. Unfortunately," +
" he is too nice for his own good and is a pushover when it comes to confrontations. After one of the worst days of his life, he finds a mask that depicts Loki, " +
"the Norse night god of mischief. Now, when he puts it on, he becomes his inner, self: a cartoon romantic wild man. However, a small time crime boss, Dorian Tyrel (Peter Greene), " +
"comes across this character dubbed The Mask by the media. After Ipkiss's alter ego indirectly kills his friend in crime," +
" Tyrel now wants this green-faced goon destroyed.",
"MASK.jpg", "Chuck Russell", "Jim Carrey as Stanley Ipkiss/The Mask,Cameron Diaz as Tina Carlyle,Amy Yasbeck as Peggy Brandt,Joely Fisher as Maggie", new LocalDate(1994, 2, 1), "Action,Comedy,CrimeAction,Family,Fantasy", 88);
//endregion
// Clearing the db first
datastore.delete(datastore.createQuery(MovieDetails.class));
// Saving a new entity and getting the result saved id
String id = (String) datastore.save(movie).getId();
// This returns as null
MovieDetails movieRetrieved = datastore.get(MovieDetails.class, id);
// This returns with one item
List<MovieDetails> allMovies = datastore.createQuery(MovieDetails.class).asList();
When I use
datastore.get(MovieDetails.class, id)
I get null
When I use:
datastore.createQuery(MovieDetails.class).asList();
I do see my movie in the DB, with the Id used in the get function.
Tried the id in many variations... toString(), ObjectId(id), Key (The value returned from the save result).
The Id in the DB (viewed with Mongo Explorer) does show as something which isn't string (blue colored), suspicious:
Mongo Explorer item picture
Any ideas?
Edit:
* the Id is indeed a string, the cast works and it was verified using watch + instanceof
Edit 2:
* Somehow the cast from ObjectId to String passed and the Id wasnt really a String.
I would change your I'd field from String to a BSON ObjectId field which MongoDB will automagically assign on save. If you then do your get call with the ObjectId as the parameter, it should work. Using ObjectId as your ID field is highly recommended with Mongo.
I am guessing that Morphia is trying to marshall an ObjectId into your String Id field and there is a small bug somewhere. I would try calling datastore.get(Example.class, new ObjectId(id)).
After Nic Cottrell (Thanks!) answer I've had a new perspective of the problem.
As my #Id field was not assigned by me it was automaticaly assigned in the DB as ObjectId.
As I still want to use String I've simply assigned the #Id field on object creation.
Id = ObjectId.get().toString();
found the solution on:
MongoDB / Morphia saves technical id as ObjectId although it's a String in Java
I have a entity, name Product.It have two property is unit (byte) and unitName(String). unit property is mapped on database. Ex: 0:Kg ; 1:g;.... I want when input a valid unit, unit property is stored; unless, it save to unitName
Product
public class Product implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "product_id")
private int productId;
#Column(name = "product_name")
private String productName;
#Column(name = "unit")
private Byte unit;
#Transient
private String unitName;
}
In unit text field, I use a UnitConvert
UnitConvert
public class UnitConverter implements IConverter<Byte> {
private static final long serialVersionUID = 4798262219257031818L;
public UnitConverter() {
}
#Override
public Byte convertToObject(String value, Locale locale) {
return Text.isEmpty(value) ? 0 : UtilCommon.getTaniCode(value);
}
#Override
public String convertToString(Byte value, Locale locale) {
return (value == null || value==0 ) ? "" : UtilCommon.getTaniName(value);
}
}
I only think about HiddenField to do that, but I don't know how to do that.
Someone know how to use or anything can help me. Thank you very much
So from what I understood you want to save the input of a Model to a different database property depending on certain checks before hand. You can do that in your Form.onSubmit() method.
A very simple implementation could look like this:
public ProductPanel(String id, final IModel<Object> productModel) {
super(id, productModel);
// we're putting the productModel into the constructor.
// Therefore it's guaranteed to be detached
// -> it's okay to have it with final modifier.
IModel<String> formModel = Model.of("");
Form<String> form = new Form<String>("form", formModel) {
#Override
protected void onSubmit() {
super.onSubmit();
String productName = getModelObject();
Object realProduct = productModel.getObject();
if (isAcceptableUnit(productName)) {
realProduct.setUnit(parseUnit(productName));
} else {
realProduct.setUnitName(productName);
}
layer.saveProduct();
}
};
add(form);
TextField<String> productName = new TextField<String>("textField", formModel);
form.add(productName);
}
private boolean isAcceptableUnit(String productName) {
// your logic to determine if it's okay to cast to byte here...
return true;
}
private byte parseUnit(String productName) {
// your logic to parse the String to byte here...
return 0;
}
Some additional comments since I'm uncertain if the code snippets you provided are just for simplicity or actually code pieces:
You should try to avoid declaring your db object Serializable. Should you use normal Model objects to save your DTOs wicket will actually serialize them and you won't be able to do anything with them (well with hibernate at least).
Database object should use LoadableDetachableModel and save the primary key to load the entity in the load() method of it.
This would enable you now to work directly on those objects by using CompoundPropertyModel etc (which has it's pros and cons which I will not explain in detail here).
Still in your case I would add an Model<String> to the form and let the server decide how the input should be handled and mapped to the actual domain object.