Hibernate 如何处理唯一字段的SqlIntegrityConstraintViolationException？

我试图捕获一个名为“código”的唯一字段的SQLIntegrityViolationException，但从未执行catch块

这是我的代码：

@Transactional
public Machine save(Machine machine) {
    try {
        machine = machineRepository.saveAndFlush(machine);
    } catch (DataIntegrityViolationException e) {
        throw new UniqueKeyViolationException(String.format(
                "Já existe um cadastro de máquina com o código %s. Corrija e tente novamente",
                machine.getCodigo()
        ));
    }

    return machine;
}

“我的控制台”中的错误：

    Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:59) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:178) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3176) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3690) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:90) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    ... 154 common frames omitted
Caused by: java.sql.SQLIntegrityConstraintViolationException: Duplicate entry '6' for key 'codigo'
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:117) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:955) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1094) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1042) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeLargeUpdate(ClientPreparedStatement.java:1345) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdate(ClientPreparedStatement.java:1027) ~[mysql-connector-java-8.0.16.jar:8.0.16]
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:175) ~[hibernate-core-5.3.10.Final.jar:5.3.10.Final]
    ... 162 common frames omitted

---

在将数据保存到数据库之前，最好先检查是否存在重复数据。如果要忽略它们，请在保存之前删除。处理

DataIntegrityViolationException

不是一个好方法。

最好在将数据保存到数据库之前检查是否存在重复。如果要忽略它们，请在保存之前删除。处理

DataIntegrityViolationException

不是一个好方法。

在

machinereposition

类中有什么？它是JPA存储库吗？它是否有

@repository

注释？在

machineRepository

类中有什么？它是JPA存储库吗？它是否有

@repository

注释？