当前事务被中止，命令被忽略，直到带有休眠的 postgresql 的事务块结束

Question

我正在使用带有 postgresql 方言的休眠，并且我正在运行一个事务错误。这是我的主要应用：

public class AppControl {

public static void main(String[] args) {
    //Configuration
    Configuration configuration = new Configuration();
    configuration.configure("hibernate.cfg.xml");
    Session session = null;
    Transaction transaction = null;

    //Session Factory
    SessionFactory sessionFactory = configuration.buildSessionFactory();

    try {
        //Session
        session = sessionFactory.openSession();
        //Begin transaction
        transaction = session.beginTransaction();
        //DB operations

        Student student = new Student();
        student.setSno(2);
        student.setSname("Venky");
        session.save(student);
        session.flush();
        transaction.commit();
    }catch (RuntimeException e) {
        try {
            session.flush();
            transaction.rollback();
        }catch(Exception ex) {
            System.out.println("Cannot rollback transaction");
        }
    } finally {

        session.close();
        sessionFactory.close();
    }

}
}

我遇到以下错误

Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not execute statement
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:190)
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:62)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3124)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3581)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:103)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:461)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:347)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1222)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:425)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:177)
at com.demo.app.AppControl.main(AppControl.java:32)
Caused by: org.postgresql.util.PSQLException: ERROR: current transaction is aborted, commands ignored until end of transaction block
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:334)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:187)
    ... 13 more

这是我的学生表：

sno(pk)|sname

感谢任何帮助。谢谢你

Answer 1

之前的查询失败，您可能在某处吞下了异常，因此它不会输出。或者您需要重新检查日志以找到 first 错误。

Answer 2

架构定义了 PK 限制。 student.setSno(2) 是主键，因此不能重复。这就是第一次运行通过的原因。您可以尝试将 2 更改为不同的值，或者您可以从 PostgreSQL 表中删除记录并尝试再次运行代码。

如果你将System.out.printStackTrace(e)添加到catch块}catch (RuntimeException e) {我想你会看到问题的根源（例如插入具有相同主键的新记录的问题）。

异常Caused by: org.postgresql.util.PSQLException: ERROR: current transaction is aborted, commands ignored until end of transaction block 说明了它所说的 - 当前正在运行的事务中出现了一些故障，并且在事务中执行的任何命令都将无效。您应该在连接上调用rollback 事务。