I know this is a dumb question, but please help out.
I have three model classes
Student class
public class Student {
private String department;
private String year;
private String division;
private String batch;
private Timetable timetable;
public Student() {}
public String getDepartment() {
return department;
}
public void setDepartment(String department) {
this.department = department;
}
public String getYear() {
return year;
}
public void setYear(String year) {
this.year = year;
}
public String getDivision() {
return division;
}
public void setDivision(String division) {
this.division = division;
}
public String getBatch() {
return batch;
}
public void setBatch(String batch) {
this.batch = batch;
}
public Timetable getTimetable() {
return timetable;
}
public void setTimetable(Timetable timetable) {
this.timetable = timetable;
}
}
Timetable class
public class Timetable implements Parcelable {
private String day;
private List<Lecture> lectures;
public Timetable(String day, List<Lecture> lectures) {
this.day = day;
this.lectures = lectures;
}
public String getDay() {
return day;
}
public void setDay(String day) {
this.day = day;
}
public List<Lecture> getLectures() {
return lectures;
}
public void setLectures(List<Lecture> lectures) {
this.lectures = lectures;
}
}
Lecture class
public class Lecture implements Parcelable {
private String code;
private String professorCode;
private String room;
private long startTime;
private long endTime;
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getProfessorCode() {
return professorCode;
}
public void setProfessorCode(String professorCode) {
this.professorCode = professorCode;
}
public String getRoom() {
return room;
}
public void setRoom(String room) {
this.room = room;
}
public long getStartTime() {
return startTime;
}
public void setStartTime(long startTime) {
this.startTime = startTime;
}
public long getEndTime() {
return endTime;
}
public void setEndTime(long endTime) {
this.endTime = endTime;
}
}
Now at this point because there is a nested containment in my data model, I am stuck in how I should structure my data in Firebase Cloud Firestore.
Student have department, year, division, Timetable.
Timetable has day and list of Lectures.
Lecture have code, professorCode, room, startTime, endTime
It'll be really great if someone helps to structure this data in firestore in terms of collection and documents. I am new to Firestore and I am finding collections and documents difficult.
I could have used Realtime Database, but there are some issues so I have to use Firestore only.
Thanks in advance
Related
i have this function to query in hibernate:
public List<TransactionQR> getAllTransaction() throws HibernateException {
return this.session.createQuery("SELECT id FROM TransactionQR").list();
}
then is success to show the data like this in html:
[2, 3]
but when i add more column in SELECT like this:
public List<TransactionQR> getAllTransaction() throws HibernateException {
return this.session.createQuery("SELECT id, codeqr FROM TransactionQR").list();
}
the result show like this:
[Ljava.lang.Object;#25026824, [Ljava.lang.Object;#170b75f9]
what is Ljava.lang.Object;#25026824 ? is return object, can i handle it to convert from list to json ?
i have model TransactionQR.java :
public class TransactionQR implements Serializable {
private Long id;
private String codeqr;
private Date approvaltime;
private String merchant;
private String code_merchant;
private Long amount;
private Long saldoawal;
private Integer tracenumber;
private String state;
private Date createdate;
private Batch batch;
public TransactionQR() {
}
public TransactionQR(Long id, String codeqr, Date approvaltime, String merchant, String code_merchant, Long amount,
Long saldoawal, Integer tracenumber, String state, Date createdate, Batch batch) {
super();
this.id = id;
this.codeqr = codeqr;
this.approvaltime = approvaltime;
this.merchant = merchant;
this.code_merchant = code_merchant;
this.amount = amount;
this.saldoawal = saldoawal;
this.tracenumber = tracenumber;
this.state = state;
this.createdate = createdate;
this.batch = batch;
}
public Long getId() {
return id;
}
public Date getApprovalTime() {
return approvaltime;
}
public Batch getBatch() {
return batch;
}
public void setBatch(Batch batch) {
this.batch = batch;
}
public void setApprovalTime(Date approvalTime) {
this.approvaltime = approvalTime;
}
public void setId(Long id) {
this.id = id;
}
public Date getApprovaltime() {
return approvaltime;
}
public void setApprovaltime(Date approvaltime) {
this.approvaltime = approvaltime;
}
public String getCodeqr() {
return codeqr;
}
public void setCodeqr(String codeqr) {
this.codeqr = codeqr;
}
public String getMerchant() {
return merchant;
}
public void setMerchant(String merchant) {
this.merchant = merchant;
}
public String getCode_merchant() {
return code_merchant;
}
public void setCode_merchant(String code_merchant) {
this.code_merchant = code_merchant;
}
public Long getAmount() {
return amount;
}
public void setAmount(Long amount) {
this.amount = amount;
}
public Long getSaldoawal() {
return saldoawal;
}
public void setSaldoawal(Long saldoawal) {
this.saldoawal = saldoawal;
}
public Integer getTracenumber() {
return tracenumber;
}
public void setTracenumber(Integer tracenumber) {
this.tracenumber = tracenumber;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public Date getCreatedate() {
return createdate;
}
public void setCreatedate(Date createdate) {
this.createdate = createdate;
}
}
the result is i want to show all data from database in list
In second case, since you are selecting two attributes, that is why session.createQuery("").list returns a list of object array(List<Object[]>) . At each index of list you will find an object array. Each array will have two indexes. First index will provide id while the second one would provide codeqr. So, basically you need to iterate over the list. Then fetch each value individually like arr[0], arr[1]..
I'm new to Java and Vaadin and stuck during display data in a Vaadin grid. I have data in JSON format like:
[
{
"id":1,
"name":"testSiteC",
"accountId":1,
"accountData":{
"id":1,
"name":"testAccountA",
"code":"AC0001",
"salesStaffId":200,
"samplingDate":1493038800000,
"startDate":1493038800000,
"creditPeriod":15,
"cinNo":"testCinNo",
"vatRegistrationNo":"testVatRegistrationNo",
"panNo":"testPanNo",
"serviceTaxRegistrationNo":"testServiceTaxRegistrationNo",
"isActive":true,
"billingType":"testBillingType",
"billingBasis":"cup count basis",
"billingAddress":"billingAddress",
"consigneeAddress":"test",
"clientRelationshipManagerStaffId":2,
"opsManagerId":1,
"serviceTaxId":1,
"createdOn":1483209000000,
"updatedOn":1494949002000
},
"building":"3rd floor",
"locality":"Koramangala",
"city":"Bangalore",
"state":"Karnataka",
"country":"India",
"peopleCount":100,
"staffInCharge":1,
"dailyStartTime":"23:34:23",
"dailyEndTime":"23:34:34",
"createdOn":1493799889000,
"updatedOn":1494945760000,
"isActive":true,
"opsStartDate":1493730000000
}
]
Bean to be nested:
package com.chaipoint.boxc.common.model;
import java.io.Serializable;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Date;
public class SiteResponse implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Long id;
private String name;
private Integer accountId;
private AccountResponse accountData;
private String building;
private String locality;
private String city;
private String state;
private String country;
private Integer peopleCount;
private Integer staffInCharge;
private Time dailyStartTime;
private Time dailyEndTime;
private Date createdOn;
private Timestamp updatedOn;
private Boolean isActive;
private Date opsStartDate;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAccountId() {
return accountId;
}
public void setAccountId(Integer accountId) {
this.accountId = accountId;
}
public AccountResponse getAccountData() {
return accountData;
}
public void setAccountData(AccountResponse accountData) {
this.accountData = accountData;
}
public String getBuilding() {
return building;
}
public void setBuilding(String building) {
this.building = building;
}
public String getLocality() {
return locality;
}
public void setLocality(String locality) {
this.locality = locality;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public Integer getPeopleCount() {
return peopleCount;
}
public void setPeopleCount(Integer peopleCount) {
this.peopleCount = peopleCount;
}
public Integer getStaffInCharge() {
return staffInCharge;
}
public void setStaffInCharge(Integer staffInCharge) {
this.staffInCharge = staffInCharge;
}
public Time getDailyStartTime() {
return dailyStartTime;
}
public void setDailyStartTime(Time dailyStartTime) {
this.dailyStartTime = dailyStartTime;
}
public Time getDailyEndTime() {
return dailyEndTime;
}
public void setDailyEndTime(Time dailyEndTime) {
this.dailyEndTime = dailyEndTime;
}
public Date getCreatedOn() {
return createdOn;
}
public void setCreatedOn(Date createdOn) {
this.createdOn = createdOn;
}
public Timestamp getUpdatedOn() {
return updatedOn;
}
public void setUpdatedOn(Timestamp updatedOn) {
this.updatedOn = updatedOn;
}
public Boolean getIsActive() {
return isActive;
}
public void setIsActive(Boolean isActive) {
this.isActive = isActive;
}
public Date getOpsStartDate() {
return opsStartDate;
}
public void setOpsStartDate(Date opsStartDate) {
this.opsStartDate = opsStartDate;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
}
Bean containing a nested bean
public class SitePantryResponse implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Long id;
private String name;
private Integer siteId;
private SiteResponse siteData;
private Integer floorNo;
private Date createdOn;
private Timestamp updatedOn;
private Boolean isActive;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getSiteId() {
return siteId;
}
public void setSiteId(Integer siteId) {
this.siteId = siteId;
}
public SiteResponse getSiteData() {
return siteData;
}
public void setSiteData(SiteResponse siteData) {
this.siteData = siteData;
}
public Integer getFloorNo() {
return floorNo;
}
public void setFloorNo(Integer floorNo) {
this.floorNo = floorNo;
}
public Date getCreatedOn() {
return createdOn;
}
public void setCreatedOn(Date createdOn) {
this.createdOn = createdOn;
}
public Timestamp getUpdatedOn() {
return updatedOn;
}
public void setUpdatedOn(Timestamp updatedOn) {
this.updatedOn = updatedOn;
}
public Boolean getIsActive() {
return isActive;
}
public void setIsActive(Boolean isActive) {
this.isActive = isActive;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
}
So, while displaying data into the grid like table.addColumn(SitePantryResponse::getSiteData::getName).setCaption("Site Name") it throws:
The target type of this expression must be a functional interface` error.
SitePantryResponse::getSiteData::getName
It's not possible to chain method references like that. You can use simple lambda expression instead:
table.addColumn(r -> r.getSideDate().getName()).setCaption("Site Name")
or if you really want to use method references, you can use a helper method which will chain them and return ValueProvider which can be later passed to Grid.addColumn:
<A, B, C> ValueProvider<A, C> chain(Function<A, B> f1, Function<B, C> f2) {
return f1.andThen(f2)::apply;
}
With this you can write:
table.addColumn(chain(SitePantryResponse::getSiteData, SiteResponse::getName)).setCaption("Site Name")
but, as you can see, this makes the code more complicated and longer, so there is no reason to use this approach over simple lambda expression.
How get value in array "rate" to invoke getters methods ?
My Json response is something as below and confused how to parse it using GSON. Please have look on the following and guide me how i can parse it using GSON.
data.json
{
"query":{
"count":2,
"created":"2017-01-03T12:45:19Z",
"lang":"en-us",
"results":{
"rate":[
{
"id":"BTC/USD",
"Name":"BTCUSD",
"Rate":"985.50",
"Date":"1/3/2017",
"Time":"10:35am",
"Ask":"985.50",
"Bid":"985.35"
},
{
"id":"BTC/EUR",
"Name":"BTCEUR",
"Rate":"973.16",
"Date":"1/3/2017",
"Time":"10:35am",
"Ask":"973.16",
"Bid":"973.10"
}
]
}
}
}
I use classes to parse apart
Market.java
public class Market {
#SerializedName("query")
private Query query;
public Query getQuery() {
return query;
}
public void setQuery(Query query) {
this.query = query;
}
}
Query.java
public class Query {
#SerializedName("count")
private Integer count;
#SerializedName("created")
private String created;
#SerializedName("lang")
private String lang;
#SerializedName("results")
private Results results;
public Integer getCount() {
return count;
}
public void setCount(Integer count) {
this.count = count;
}
public String getCreated() {
return created;
}
public void setCreated(String created) {
this.created = created;
}
public String getLang() {
return lang;
}
public void setLang(String lang) {
this.lang = lang;
}
public Results getResults() {
return results;
}
public void setResults(Results results) {
this.results = results;
}
}
Rate.java
public class Rate {
#SerializedName("id")
private String id;
#SerializedName("Name")
private String name;
#SerializedName("Rate")
private String rate;
#SerializedName("Date")
private String date;
#SerializedName("Time")
private String time;
#SerializedName("Ask")
private String ask;
#SerializedName("Bid")
private String bid;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRate() {
return rate;
}
public void setRate(String rate) {
this.rate = rate;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public String getAsk() {
return ask;
}
public void setAsk(String ask) {
this.ask = ask;
}
public String getBid() {
return bid;
}
public void setBid(String bid) {
this.bid = bid;
}
}
Results.java
public class Results {
#SerializedName("rate")
private List<Rate> rate = null;
public List<Rate> getRate() {
return rate;
}
public void setRate(List<Rate> rate) {
this.rate = rate;
}
}
Trying to get the values
Main.java
public class Main {
/* ..... */
Gson gson = new Gson();
Market market = gson.fromJson(json, Market.class);
//error: incompatible types: Rate cannot be converted to List<Rate>
for( List<Rate> res : market.getQuery().getResults().getRate());
{
Log.v(LOG_TAG, res); // error: cannot find symbol variable res
}
}
how to do it properly ?
The syntax of your for each loop is incorrect. Since you are attempting to loop through a list of Rate objects, the type of res should be a Rate, not a list of Rates:
for (Rate res : market.getQuery().getResults().getRate()) {
// code here
}
As an aside, you should consider checking for null values before dereferencing all of those child objects as you run the risk of throwing a NullPointerException at runtime.
I'm having trouble trying to understand how realm.io persist/save objects.
I have 3 Objects (Inventory, InventoryItem and Product);
When I create a Inventory containing InventoryItems it works fine until i close the app. When i re-open the app all InventoryItems loses the reference to Product and start to show "null" instead.
Strange thing is all other attributes like Inventory reference to InventoryItem is persisted fine. Just problem with Products.
this is how i'm trying to do:
Model
Product
public class Product extends RealmObject {
#PrimaryKey
private String id;
#Required
private String description;
private int qtdUnityType1;
private int qtdUnityType2;
private int qtdUnityType3;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public int getQtdUnityType1() {
return qtdUnityType1;
}
public void setQtdUnityType1(int qtdUnityType1) {
this.qtdUnityType1 = qtdUnityType1;
}
public int getQtdUnityType2() {
return qtdUnityType2;
}
public void setQtdUnityType2(int qtdUnityType2) {
this.qtdUnityType2 = qtdUnityType2;
}
public int getQtdUnityType3() {
return qtdUnityType3;
}
public void setQtdUnityType3(int qtdUnityType3) {
this.qtdUnityType3 = qtdUnityType3;
}
}
Inventory
public class Inventory extends RealmObject {
#PrimaryKey
private String id;
#Required
private String type;
#Required
private Date createdAt;
#Required
private String status;
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
private RealmList<InventoryItem> listItems;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public Date getCreatedAt() {
return createdAt;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public RealmList<InventoryItem> getListItems() {
return listItems;
}
public void setListItems(RealmList<InventoryItem> listItems) {
this.listItems = listItems;
}
}
InventoryItem
public class InventoryItem extends RealmObject {
#PrimaryKey
private String idItem;
private Inventory inventory;
private Product product;
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
private Date expirationDate;
private int qtdUnityType1;
private int qtdUnityType2;
private int qtdUnityType3;
private int qtdDiscard;
public String getIdItem() {
return idItem;
}
public void setIdItem(String idItem) {
this.idItem = idItem;
}
public Inventory getInventory() {
return inventory;
}
public void setInventory(Inventory inventory) {
this.inventory = inventory;
}
public Date getExpirationDate() {
return expirationDate;
}
public void setExpirationDate(Date expirationDate) {
this.expirationDate = expirationDate;
}
public int getQtdUnityType1() {
return qtdUnityType1;
}
public void setQtdUnityType1(int qtdUnityType1) {
this.qtdUnityType1 = qtdUnityType1;
}
public int getQtdUnityType2() {
return qtdUnityType2;
}
public void setQtdUnityType2(int qtdUnityType2) {
this.qtdUnityType2 = qtdUnityType2;
}
public int getQtdUnityType3() {
return qtdUnityType3;
}
public void setQtdUnityType3(int qtdUnityType3) {
this.qtdUnityType3 = qtdUnityType3;
}
public int getQtdDiscard() {
return qtdDiscard;
}
public void setQtdDiscard(int qtdDiscard) {
this.qtdDiscard = qtdDiscard;
}
}
and finally one of the millions ways i tried to persist
realm.beginTransaction();
Inventory inventory = realm.createObject(Inventory.class);
inventory.setId(id);
inventory.setCreatedAt(new DateTime().toDate());
if (radioGroup.getCheckedRadioButtonId() == R.id.rbInventario) {
inventory.setType("Inventário");
} else {
inventory.setType("Validade");
}
inventory.setStatus("Aberto");
RealmList<InventoryItem> inventoryItems = new RealmList<>();
RealmResults<Product> productsRealmResults = realm.allObjects(Product.class);
for (int i = 1; i <= productsRealmResults.size(); i++) {
InventoryItem item = realm.createObject(InventoryItem.class);
item.setIdProduct(productsRealmResults.get(i - 1).getId() + " - " + productsRealmResults.get(i - 1).getDescription());
item.setProduct(productsRealmResults.get(i - 1));
item.setIdItem(i + "-" + id);
item.setInventory(inventory);
item = realm.copyToRealmOrUpdate(item);
item = realm.copyToRealmOrUpdate(item);
inventoryItems.add(item);
}
inventory.setListItems(inventoryItems);
realm.copyToRealmOrUpdate(inventory);
realm.commitTransaction();
I already looked trough some answers here like this one:
stack answer
and the Java-examples (person, dog, cat)
provided with the API
but I can't understand how to properly insert this.
The problem is that you are setting a list of InventoryItem elements which are not added to the Realm database.
Change InventoryItem item = new InventoryItem(); to InventoryItem item = realm.createObject(InventoryItem.class);
Also, the inventoryItems themselves aren't stored in Realm db. Add realm.copyToRealmOrUpdate(inventoryItems) after the loop.
I have some values in my object are returning by value null when converting from json to object and some others doesn't,i can't figure out why is that happening
here's my code to convert
OriginalMovie originalMovie = gson.fromJson(jsonString, OriginalMovie.class);
here's my json
{"page":1,
"results":[{"adult":false,
"backdrop_path":"/o4I5sHdjzs29hBWzHtS2MKD3JsM.jpg",
"genre_ids":[878,28,53,12],
"id":87101,"original_language":"en",
"original_title":"Terminator Genisys",
"overview":"The year is 2029. John Connor, leader of the resistance continues the war against the machines.",
"release_date":"2015-07-01",
"poster_path":"/5JU9ytZJyR3zmClGmVm9q4Geqbd.jpg",
"popularity":54.970301,
"title":"Terminator Genisys","video":false,
"vote_average":6.4,
"vote_count":197}],
"total_pages":11666,"total_results":233312}
and here's my base class (contains results)
package MovieReviewHelper;
import java.util.ArrayList;
import java.util.List;
public class OriginalMovie
{
private long page;
private List<Result> results = new ArrayList<Result>();
private long totalPages;
private long totalResults;
public long getPage()
{
return page;
}
public void setPage(long page)
{
this.page = page;
}
public List<Result> getResults()
{
return results;
}
public void setResults(List<Result> results)
{
this.results = results;
}
public long getTotalPages() {
return totalPages;
}
public void setTotalPages(long totalPages)
{
this.totalPages = totalPages;
}
public long getTotalResults()
{
return totalResults;
}
public void setTotalResults(long totalResults)
{
this.totalResults = totalResults;
}
}
and here's my other class
package MovieReviewHelper;
import java.util.ArrayList;
import java.util.List;
public class Result {
private boolean adult;
private String backdropPath;
private List<Long> genreIds = new ArrayList<Long>();
private long id;
private String originalLanguage;
private String originalTitle;
private String overview;
private String releaseDate;
private String posterPath;
private double popularity;
private String title;
private boolean video;
private double voteAverage;
private long voteCount;
public boolean isAdult()
{
return adult;
}
public void setAdult(boolean adult)
{
this.adult = adult;
}
public String getBackdropPath()
{
return backdropPath;
}
public void setBackdropPath(String backdropPath)
{
this.backdropPath = backdropPath;
}
public List<Long> getGenreIds()
{
return genreIds;
}
public void setGenreIds(List<Long> genreIds)
{
this.genreIds = genreIds;
}
public long getId()
{
return id;
}
public void setId(long id)
{
this.id = id;
}
public String getOriginalLanguage()
{
return originalLanguage;
}
public void setOriginalLanguage(String originalLanguage)
{
this.originalLanguage = originalLanguage;
}
public String getOriginalTitle()
{
return originalTitle;
}
public void setOriginalTitle(String originalTitle)
{
this.originalTitle = originalTitle;
}
public String getOverview()
{
return overview;
}
public void setOverview(String overview)
{
this.overview = overview;
}
public String getReleaseDate()
{
return releaseDate;
}
public void setReleaseDate(String releaseDate)
{
this.releaseDate = releaseDate;
}
public String getPosterPath()
{
return posterPath;
}
public void setPosterPath(String posterPath)
{
this.posterPath = posterPath;
}
public double getPopularity()
{
return popularity;
}
public void setPopularity(double popularity)
{
this.popularity = popularity;
}
public String getTitle()
{
return title;
}
public void setTitle(String title)
{
this.title = title;
}
public boolean isVideo()
{
return video;
}
public void setVideo(boolean video)
{
this.video = video;
}
public double getVoteAverage()
{
return voteAverage;
}
public void setVoteAverage(double voteAverage)
{
this.voteAverage = voteAverage;
}
public long getVoteCount()
{
return voteCount;
}
public void setVoteCount(long voteCount)
{
this.voteCount = voteCount;
}
}
Your Json and Class variables should have the same name.
backdrop_path in Json and backdropPath in class would not work
Incase this helps for someone like me who spent half a day in trying to figure out a similar issue with gson.fromJson() returning object with null values, but when using #JsonProperty with an underscore in name and using Lombok in the model class.
My model class had a property like below and am using Lombok #Data for class
#JsonProperty(value="dsv_id")
private String dsvId;
So in my Json file I was using
"dsv_id"="123456"
Which was causing null value. The way I resolved it was changing the Json to have below ie.without the underscore. That fixed the problem for me.
"dsvId = "123456"