I have an object and an enum for it. When I give away an object, I want my enum inside the object to be displayed as an object with the name and value attributes without using DTO, or to be partially used. I want json to build this object itself (enum with name and value), and I give only the object in which this enum is contained.
public enum MyType {
TT("Time Tu"), TD("Time dust");
MyType(String value) {
this.value = value;
}
private String value;
public String getValue() {
return value;
}
#Override
public String toString() {
return value;
}
Here is the DTO, it may be necessary (get/set/constructor auto generated by Intellij Idea)
public class MyTypeWrapper {
private String name;
private String value;
}
#Entity
public class MyObject {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
private String number;
........
private MyType myType;
........
}
Perhaps serialization/deserialization is needed? How to do it?
It should go something like this:
{
.....
myType: {
"name: "TT",
"value: "TD"
},
.....
}
Perhaps this is a piece of the solution? But I'm not sure that it will work, and it's not clear how to serialize
public enum MyType {
......
#JsonValue
private MyTypeWrapper getWrapper()
return new MyTypeWrapper(this.name, this.value)
}
......
}
This turned out to be the solution
public enum MyType {
......
#JsonValue
private MyTypeWrapper getWrapper()
return new MyTypeWrapper(this.name, this.value)
}
......
}
Related
I have created an enum like the below to store static dropdown value.
#JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum Days {
MONDAY(1,"Monday"), TUESDAY(2,"Tuesday"),THURSDAY(4,"Thursday"), FRIDAY(5,"Friday"), SATURDAY(6,"Saturday"),
SUNDAY(7,"Sunday");
private final Integer key;
private final String value;
Days(Integer key, String value) {
this.key = key;
this.value = value;
}
public Integer getKey() {
return key;
}
public String getValue() {
return value;
}
}
I have written a below endpoint to list enum data as a JSON response
#GetMapping("/getenums")
public List<Days> getenums() {
return Arrays.asList(Days.values());
}
which results in an array of JSON Objects like below
[{"key":1,"value":"Monday"},{"key":2,"value":"Tuesday"},{"key":4,"value":"Thursday"},{"key":5,"value":"Friday"},{"key":6,"value":"Saturday"},{"key":7,"value":"Sunday"}]
I have sample domain like below
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long userId;
private String name;
private Days day;
private Month month;
}
Below is my controller,
#PostMapping("/user")
public User createInstructor(#RequestBody User user) {
return userRepository.save(user);
}
While trying to save the user using the below request data getting bad request how can I resolve this
{
"name": "Pradeep",
"day": {
"key": 1,
"value": "Monday"
},
"month": "JUNE"
}
If you really want to return the complete enum object in your REST API then one solution could be adding a custom deserializer to it:
#JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum Days {
MONDAY(1,"Monday"), TUESDAY(2,"Tuesday"),THURSDAY(4,"Thursday"), FRIDAY(5,"Friday"), SATURDAY(6,"Saturday"),
SUNDAY(7,"Sunday");
private final Integer key;
private final String value;
Days(Integer key, String value) {
this.key = key;
this.value = value;
}
public Integer getKey() {
return key;
}
public String getValue() {
return value;
}
#JsonCreator
public static Days fromObject(Map<String, Object> obj) {
if (obj != null && obj.containsKey("key") && obj.containsKey("value")) {
Integer key = obj.get("key");
String value = obj.get("value");
if (key != null) {
for (Days day : Days.values()) {
if (key.equals(e.getKey())) {
return day;
} else {
return null;
}
}
}
return null;
}
return null;
}
}
Additionally, you might want to tell Hibernate how to store your Enum in the database. You can use #Enumerated(EnumType.STRING) for that as follows:
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long userId;
private String name;
#Enumerated(EnumType.STRING)
private Days day;
private Month month;
}
This will store it as a String. The other option is ORDINAL, which will persist the Enum as an Integer.
I have a case where I need to execute an insert statement via createNativeQuery. I have an entity list I'm looping through in order to set the properties accordingly from another bean class, and then persist that data to the oracle database.
The problem I am facing is persisting the data that is part of the embeddedId (item, loc, weekstart, type, forecastId, insertTS). I need to persist that data for the new records to be inserted into the database. When I try to set the values from the POJO bean to my set method for the properties of my entity bean, nothing happens. Below is my code for setting the values of the properties from the POJO bean to my entity bean, along with my persistence method and the insert query being executed:
Validation class where validation occurs beforehand (missing to get the point) that includes the setting of my entity properties from the POJO bean:
List <InsertPromoData> insertPromos = new ArrayList<InsertPromoData>();
promo.forEach(record -> {
if (record.getErrorList().size() == 0) {
rowsSuccessful++;
Util.writeSuccessToFile(templateCd, successFile, record, successFields);
try {
InsertPromoData insertData = new InsertPromoData();
insertData.getId().setItem(record.getItem());
insertData.getId().setLoc(record.getLoc());
insertData.getId().setWeekStart(record.getWeek_Start_Date());
insertData.setNumberOfWeeks(record.getNumber_Of_Weeks());
insertData.getId().setType(record.getType());
insertData.getId().setForecastId(record.getForecast_ID());
insertData.setQty(record.getUnits());
insertPromos.add(insertData);
}
catch (Exception e) {
logger.error("Error with setting insertPromolist from promo list values and the error is " + e.getMessage());
}
}
else {
if (rowsFailure == 0) {
Util.writeHeaderToFile(templateCd, errorFile);
}
rowsFailure++;
Util.writeErrorToFile(templateCd, errorFile, record, record.getErrorList());
}
});
errorFile.close();
successFile.close();
OracleImpl.insertPromoData(insertPromos);
POJO bean (promo is the variable representing this list of beans in validation class above):
public class PromoBean extends ErrorListBean
{
public String Item;
public String Loc;
public String Week_Start_Date;
public String Units;
public String Forecast_ID;
public String Type;
public String Number_Of_Weeks;
public String getItem() {
return Item;
}
public void setItem(String item) {
Item = item;
}
public String getLoc() {
return Loc;
}
public void setLoc(String loc) {
Loc = loc;
}
public String getWeek_Start_Date() {
return Week_Start_Date;
}
public void setWeek_Start_Date(String week_Start_Date) {
Week_Start_Date = week_Start_Date;
}
public String getNumber_Of_Weeks() {
return Number_Of_Weeks;
}
public void setNumber_Of_Weeks(String number_Of_Weeks) {
Number_Of_Weeks = number_Of_Weeks;
}
public String getType() {
return Type;
}
public void setType(String type) {
Type = type;
}
public String getForecast_ID() {
return Forecast_ID;
}
public void setForecast_ID(String forecast_ID) {
Forecast_ID = forecast_ID;
}
public String getUnits() {
return Units;
}
public void setUnits(String units) {
Units = units;
}
}
Embeddable class representing the composite primary key of the table:
#Embeddable
public class PromoID implements Serializable {
#Column(name = "ITEM")
private String item;
#Column(name = "LOC")
private String loc;
#Column(name = "WK_START")
private String weekStart;
#Column(name = "TYPE")
private String type;
#Column(name = "FCSTID")
private String forecastId;
#Column(name = "U_TIMESTAMP")
private String insertTS;
public PromoID() {
}
public PromoID (String item, String loc, String weekStart, String type, String forecastId, String insertTS) {
this.item = item;
this.loc = loc;
this.weekStart = weekStart;
this.type = type;
this.forecastId = forecastId;
this.insertTS = insertTS;
}
public String getItem() {
return item;
}
public void setItem(String item) {
this.item = item;
}
public String getLoc() {
return loc;
}
public void setLoc(String loc) {
this.loc = loc;
}
public String getWeekStart() {
return weekStart;
}
public void setWeekStart(String weekStart) {
this.weekStart = weekStart;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getForecastId() {
return forecastId;
}
public void setForecastId(String forecastId) {
this.forecastId = forecastId;
}
public String getInsertTS() {
return insertTS;
}
public void setInsertTS(String insertTS) {
this.insertTS = insertTS;
}
//hashcode and equals methods
Persistence Bean:
#Entity
#Table(name = "U_USER_PROMO")
public class InsertPromoData {
#EmbeddedId
private PromoID id;
#Column(name="NUMBER_OF_WEEKS")
String numberOfWeeks;
#Column(name="QTY")
String qty;
#Id
#AttributeOverrides(
{
#AttributeOverride(name = "item",column = #Column(name="ITEM")),
#AttributeOverride(name = "loc", column = #Column(name="LOC")),
#AttributeOverride(name = "weekStart", column = #Column(name="WK_START")),
#AttributeOverride(name = "type", column = #Column(name="TYPE")),
#AttributeOverride(name = "forecastId", column = #Column(name="FCSTID"))
}
)
public PromoID getId() {
return id;
}
public void setId(PromoID id) {
this.id = id;
}
public String getNumberOfWeeks() {
return numberOfWeeks;
}
public void setNumberOfWeeks(String numberOfWeeks) {
this.numberOfWeeks = numberOfWeeks;
}
public String getQty() {
return qty;
}
public void setQty(String qty) {
this.qty = qty;
}
}
DAO class method to execute the update (entitymanagerfactory emf already initialized):
public static void insertPromoData(List<InsertPromoData> insertData) {
logger.debug("Execution of method insertPromoData in Dao started");
System.out.println("Size of the insertData list is " + insertData.size());
EntityManager em = emf.createEntityManager();
try {
em.getTransaction().begin();
System.out.println("Beginning transaction for insertPromoData");
Query query = em.createNativeQuery(env.getProperty("insertPromoUploadData"));
for (InsertPromoData promoData : insertData) {
query.setParameter("item", promoData.getId().getItem());
query.setParameter("location", promoData.getId().getLoc());
query.setParameter("wkStart", promoData.getId().getWeekStart());
query.setParameter("numberOfWeeks", promoData.getNumberOfWeeks());
query.setParameter("type", promoData.getId().getType());
query.setParameter("fcstId", promoData.getId().getForecastId());
query.setParameter("quantity", promoData.getQty());
query.executeUpdate();
}
em.getTransaction().commit();
}
catch(Exception e) {
logger.error("Exception in beginning transaction");
e.printStackTrace();
}
finally {
em.clear();
em.close();
}
logger.debug("Execution of method insertPromoData in Dao ended");
}
Query in properties file:
insertPromoUploadData = INSERT INTO {h-schema}U_USER_PROMO (ITEM, LOC, WK_START, NUMBER_OF_WEEKS, TYPE, FCSTID, QTY, U_TIMESTAMP) VALUES (:item, :location, TO_DATE(:wkStart,'MM DD YYYY'), :numberOfWeeks, :type, :fcstId, :quantity, SYSDATE)
My list size from my DAO class is returning as 0 once I begin the transaction and not sure why it is empty. Is there a reason that it is empty? I'm trying to persist each of the fields to the database (including the composite key fields) via insert query. Any help appreciated.
After looking into this for hours, I finally came to the conclusion that the simplest way to executeUpdate() without running into issues due to my current #EmbeddedId/#Embeddable logic was to change it to use #IdClass for my composite PK class, and annotate the fields from the PK in my entity with #Id. This allowed my data to be persisted to the database. Another slight difference was adding the insertTS in my entity class and annotating with #Id and generating getters/setters. This was necessary for JPA to recognize all the properties being referenced that I am wanting to persist, though I am persisting insertTS using SYSDATE function from the oracle DB instead of utilizing the get/set methods and setting to the current time from the java side.
I am sure there is a way to use #EmbeddedId/#Embeddable logic and be able to persist the fields that are part of the EmbeddedId, however, this I found to be a more simplistic way of doing it without further complexity in the code.
I am new in JPA,
I want to set only specific fix department names to attribute in entity as a fix string as constraints.I.e default values to attributes.
How to set it?
I think the best option is to use enumerated as indicated by Dinesh Dontha, try this:
Entity
#Entity
public class MyEntity implements Serializable(){
private MyEnum attribute;
}
Enum
public enum MyEnum {
NAME1("N1")
private String shortName;
private MyEnum(String shortName) {
this.shortName = shortName;
}
public String getShortName() {
return shortName;
}
public static MyEnum fromShortName(String shortName) {
switch (shortName) {
case "N1":
return NacionalidadEnum.NAME1;
default:
throw new IllegalArgumentException("ShortName [" + shortName
+ "] not supported.");
}
}
}
Converter
#Converter(autoApply = true)
public class MyEntityEnumConverter implements AttributeConverter<MyEnum, String> {
#Override
public String convertToDatabaseColumn(MyEnum myEnum) {
return myEnum.getShortName();
}
#Override
public MyEnum convertToEntityAttribute(String dbData) {
return MyEnum.fromShortName(dbData);
}
}
I have this simple REST API that i created with Spring Boot.
In this app, I have a a POJO called Expense with 4 fields. I have a no Argument constructor and another constructor that takes only two inputs. One String value "item" and one Integer value "amount". The date is set using the LocalData.now() method and the id is set automatically in a MySql db running in the server.
Here's my Entity class
#Entity
public class Expense {
#Id
#GeneratedValue (strategy = GenerationType.AUTO)
private Integer id;
private String date;
private String item;
private Integer amount;
//No Arg Construction required by JPA
public Expense() {
}
public Expense(String item, Integer amount) {
this.date = LocalDate.now().toString();
this.item = item;
this.amount = amount;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getItem() {
return item;
}
public void setItem(String item) {
this.item = item;
}
public Integer getAmount() {
return amount;
}
public void setAmount(Integer amount) {
this.amount = amount;
}
}
I have another class with RestController annotation where i have set a method to post Expense object with a post method using Request Mapping annotation.
#RestController
public class ExpController {
private ExpService expService;
private ExpenseRepo expenseRepo;
#Autowired
public ExpController(ExpService expService, ExpenseRepo expenseRepo) {
this.expService = expService;
this.expenseRepo = expenseRepo;
}
#RequestMapping(path = "/addExp", method=RequestMethod.POST)
public void addExp(Expense expense){
expenseRepo.save(expense);
}
}
Now finally i am using PostMan to make the HTTP Post Request. I have made a simple Json Format text to send Item and Amount
{
"item":"Bread",
"amount": 75
}
After I make the post request, all i can see is that a new Entry is created but all values are set to null.
I have done some experimentation and found out that the expenseRepo.save(expense) method is only using the default no Arg constructor to save the data. But it's not using the second constructor that takes the two parameters that I am passing through Postman
How to solve this issue. Please help
Change your controller method like this
#RequestMapping(path = "/addExp", method=RequestMethod.POST)
public void addExp(#RequestBody Expense expense){
expenseRepo.save(expense);
}
You need to use #RequestBody
I have and Enum like below.
public enum MyEnum {
ENUM1("ENUM1Code", "ENUM1 Desc"), ENUM2("ENUM2Code", "ENUM2"), ENUM3("ENUM3Code", "ENUM3");
private String code;
private String description;
private MyEnum(String code, String description) {
this.code = code;
this.description = description;
}
public String getCode() {
return code;
}
public String getDescription() {
return description;
}
}
Can anybody suggest me how to remove the initialisation from this Enum and perform it through Spring ?
Thanks in advance
Dileep
You can't because enum are static objects.
You can externalize code/description and manage them manually.
EDIT:
I can't see need to use Spring for this type of jobs; you can achieve the same goal with easy code (a bit of Spring is used, the PropertiesLoaderUtils utility class).
Create a properties file where you store, for every enum, code and description and write utility code to read data; result of your custom code is a UDT like that:
class EnumWithData implements Serializable {
MyEnum enumValue;
String code;
String description;
// Write properties get/set
// Equals check for enumValue only
boolean equals(Object other) {
EnumWithData b = (EnumWithData)other;
return b.enumValue == this.enumValue;
}
}
abstract class EnumWithDataUtility {
private static Properties definition = PropertiesLoaderUtils.loadProperties("path/to/resource");
public final static EnumWithData getEnumWithData(MyEnum enumValue) {
EnumWithData udt = new EnumWithData();
udt.enumValue = enumValue;
...
return udt;
}
}