Java Quarkus Panache（Hibernate）不更新实体属性

Question

我有一个PSU实体：

@Entity
public class Psu extends PanacheEntityBase {
    @Id
    @GeneratedValue
    public UUID uuid;

    @Column(nullable = false, length = 50)
    public String username;
    public Integer coins;
    public String firebaseRegistrationToken;

    public void setCoins(int coins){
        this.coins = coins;
    }

    public int getCoins(){
        return coins;
    }

    public static Psu findByUsername(String username){
        return find("username", username).firstResult();
    }
} 

@Transactional
public Transaction changeBalance(Transaction transaction){
    Psu psuSender = Psu.findById(transaction.senderId);
    psuSender.coins = psuSender.coins - transaction.amount;
    Psu.persist(psuSender);

    transaction.status = TransactionStatus.PROCESSED;

    return transaction;
}

List<Psu> allPsu = Psu.findAll().list();
for(Psu psu : allPsu){
    System.out.println("ID: " + psu.uuid + " coins: " + psu.coins);
}

@GET
@Path("psu/getBalance/{uuid}")
@Produces(MediaType.APPLICATION_JSON)
public String getBalanceById(@PathParam("uuid") UUID uuid) {
    List<Psu> allPsu = Psu.findAll().list();
    for(Psu psu : allPsu){
        System.out.println("ID: " + psu.uuid + " coins: " + psu.coins);
    }

    return gson.toJson(psuService.getBalanceById(uuid));
}

@Transactional
public int getBalanceById(UUID uuid){
    Psu psu = Psu.findById(uuid);
    return psu.getCoins();
}

null

Psu.update("coins = ?1 where id= ?2", 10, transaction.senderId);

我收到错误：

ERROR [io.qua.sch.run.SimpleScheduler] (executor-thread-1) Error occured while executing task for trigger IntervalTrigger [id=1_com.msp.sqs.MessageQueue_ScheduledInvoker_receiveMessages_e721e20dd5fdaa8a94c141
a7768b0311d6f32352, interval=1000]: javax.persistence.TransactionRequiredException: Executing an update/delete query

Answer 1

我认为它没有更新，因为您正在对现有实体使用persist。因为实体是托管的并且存在，所以可以通过以下方式更改代码：

@Transactional
public Transaction changeBalance(Transaction transaction){
    Psu psuSender = Psu.findById(transaction.senderId);
    psuSender.coins = psuSender.coins - transaction.amount;
    // Psu.persist(psuSender); <-- Remove this

    transaction.status = TransactionStatus.PROCESSED;
    return transaction;
}

由于实体处于托管状态，在提交事务时更改将传播到数据库。