CREATE TABLE `goods` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `good_id` varchar(20) DEFAULT NULL,
  `num` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `goods_good_id_index` (`good_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","");

        //part1
        conn.setAutoCommit(false);
        Statement statement = conn.createStatement();
        statement.execute("INSERT INTO test.goods ( good_id, num) VALUES ( 'sku123', 0);");

        conn.commit();

        //part2
        statement = conn.createStatement();
        statement.execute("INSERT INTO test.goods ( good_id, num) VALUES ( 'sku123', 0);");

        conn.setAutoCommit(true);

        //part3
        try {
            statement = conn.createStatement();
            statement.execute("INSERT INTO test.goods ( good_id, num) VALUES ( 'sku123', 0);");
            int i = 1/0;
        }catch (Exception ex){
            System.out.println("there is an error");
        }
        conn.setAutoCommit(true);

        //part4
        conn.setAutoCommit(false);
        try {
            statement = conn.createStatement();
            statement.execute("INSERT INTO test.goods ( good_id, num) VALUES ( 'sku123', 0);");
            int i = 1/0;
        }catch (Exception ex){
            System.out.println("there is an error");
        }
        conn.setAutoCommit(true);

TransactionSynchronizationManager.registerSynchronization(new TransactionSynchronization(){
    public void afterCommit() {
        //...執(zhí)行一些操作
    }
});

@TransactionalEventListener
public void handleEvent(Event event){
    //...執(zhí)行一些操作
}

public interface PlatformTransactionManager extends TransactionManager {
    
    TransactionStatus getTransaction(@Nullable TransactionDefinition definition)
            throws TransactionException;
    
    void commit(TransactionStatus status) throws TransactionException;
    
    void rollback(TransactionStatus status) throws TransactionException;
}

private void processCommit(DefaultTransactionStatus status) throws TransactionException {
        try {
            //...
             else if (status.isNewTransaction()) {
                    if (status.isDebug()) {
                        logger.debug("Initiating transaction commit");
                    }
                    unexpectedRollback = status.isGlobalRollbackOnly();
                    //...假設(shè)事務(wù)提交成功
                    doCommit(status);
             }
            try {
                triggerAfterCommit(status);
            }
            finally {
                triggerAfterCompletion(status, TransactionSynchronization.STATUS_COMMITTED);
            }
        }
        finally {
            cleanupAfterCompletion(status);
        }

private TransactionStatus handleExistingTransaction(
    TransactionDefinition definition, Object transaction, boolean debugEnabled)
    throws TransactionException {
    //...
    return prepareTransactionStatus(definition, transaction, false, newSynchronization, debugEnabled, null);
}

protected void doCommit(DefaultTransactionStatus status) {
    DataSourceTransactionObject txObject = (DataSourceTransactionObject) status.getTransaction();
    Connection con = txObject.getConnectionHolder().getConnection();
    if (status.isDebug()) {
        logger.debug("Committing JDBC transaction on Connection [" + con + "]");
    }
    try {
        con.commit();
    }
    catch (SQLException ex) {
        throw new TransactionSystemException("Could not commit JDBC transaction", ex);
    }
}

private void cleanupAfterCompletion(DefaultTransactionStatus status) {
    status.setCompleted();
    if (status.isNewSynchronization()) {
        TransactionSynchronizationManager.clear();
    }
    if (status.isNewTransaction()) {
        doCleanupAfterCompletion(status.getTransaction());
    }
    if (status.getSuspendedResources() != null) {
        if (status.isDebug()) {
            logger.debug("Resuming suspended transaction after completion of inner transaction");
        }
        Object transaction = (status.hasTransaction() ? status.getTransaction() : null);
        resume(transaction, (SuspendedResourcesHolder) status.getSuspendedResources());
    }
}

protected void doCleanupAfterCompletion(Object transaction) {
    DataSourceTransactionObject txObject = (DataSourceTransactionObject) transaction;

    // Remove the connection holder from the thread, if exposed.
    if (txObject.isNewConnectionHolder()) {
        TransactionSynchronizationManager.unbindResource(obtainDataSource());
    }

    // Reset connection.
    Connection con = txObject.getConnectionHolder().getConnection();
    try {
        if (txObject.isMustRestoreAutoCommit()) {
            con.setAutoCommit(true);
        }
        DataSourceUtils.resetConnectionAfterTransaction(
            con, txObject.getPreviousIsolationLevel(), txObject.isReadOnly());
    }
    catch (Throwable ex) {
        logger.debug("Could not reset JDBC Connection after transaction", ex);
    }

    if (txObject.isNewConnectionHolder()) {
        if (logger.isDebugEnabled()) {
            logger.debug("Releasing JDBC Connection [" + con + "] after transaction");
        }
        DataSourceUtils.releaseConnection(con, this.dataSource);
    }

    txObject.getConnectionHolder().clear();
}

protected void doCommit(DefaultTransactionStatus status) {
    HibernateTransactionObject txObject = (HibernateTransactionObject) status.getTransaction();
    Transaction hibTx = txObject.getSessionHolder().getTransaction();
    Assert.state(hibTx != null, "No Hibernate transaction");
    if (status.isDebug()) {
        logger.debug("Committing Hibernate transaction on Session [" +
                     txObject.getSessionHolder().getSession() + "]");
    }

    try {
        //看這里
        hibTx.commit();
    }
    catch (org.hibernate.TransactionException ex) {
        // assumably from commit call to the underlying JDBC connection
        throw new TransactionSystemException("Could not commit Hibernate transaction", ex);
    }
    catch (HibernateException ex) {
        // assumably failed to flush changes to database
        throw convertHibernateAccessException(ex);
    }
    catch (PersistenceException ex) {
        if (ex.getCause() instanceof HibernateException) {
            throw convertHibernateAccessException((HibernateException) ex.getCause());
        }
        throw ex;
    }
}

protected void doCleanupAfterCompletion(Object transaction) {
    HibernateTransactionObject txObject = (HibernateTransactionObject) transaction;
    // Remove the session holder from the thread.
    if (txObject.isNewSessionHolder()) {
        TransactionSynchronizationManager.unbindResource(obtainSessionFactory());
    }
    // Remove the JDBC connection holder from the thread, if exposed.
    if (getDataSource() != null) {
        TransactionSynchronizationManager.unbindResource(getDataSource());
    }
    Session session = txObject.getSessionHolder().getSession();
    if (this.prepareConnection && isPhysicallyConnected(session)) {
        // We're running with connection release mode "on_close": We're able to reset
        // the isolation level and/or read-only flag of the JDBC Connection here.
        // Else, we need to rely on the connection pool to perform proper cleanup.
        try {
            Connection con = ((SessionImplementor) session).connection();
            Integer previousHoldability = txObject.getPreviousHoldability();
            if (previousHoldability != null) {
                con.setHoldability(previousHoldability);
            }
            DataSourceUtils.resetConnectionAfterTransaction(
                con, txObject.getPreviousIsolationLevel(), txObject.isReadOnly());
        }
        catch (HibernateException ex) {
            logger.debug("Could not access JDBC Connection of Hibernate Session", ex);
        }
        catch (Throwable ex) {
            logger.debug("Could not reset JDBC Connection after transaction", ex);
        }
    }
    if (txObject.isNewSession()) {
        if (logger.isDebugEnabled()) {
            logger.debug("Closing Hibernate Session [" + session + "] after transaction");
        }
        SessionFactoryUtils.closeSession(session);
    }
    else {
        if (logger.isDebugEnabled()) {
            logger.debug("Not closing pre-bound Hibernate Session [" + session + "] after transaction");
        }
        if (txObject.getSessionHolder().getPreviousFlushMode() != null) {
            session.setFlushMode(txObject.getSessionHolder().getPreviousFlushMode());
        }
        if (!this.allowResultAccessAfterCompletion && !this.hibernateManagedSession) {
            disconnectOnCompletion(session);
        }
    }
    txObject.getSessionHolder().clear();
}

private void processCommit(DefaultTransactionStatus status) throws TransactionException {
        try {
            //...
             else if (status.isNewTransaction()) {
                    if (status.isDebug()) {
                        logger.debug("Initiating transaction commit");
                    }
                    unexpectedRollback = status.isGlobalRollbackOnly();
                    //...假設(shè)事務(wù)提交成功
                    doCommit(status);
             }
            try {
                triggerAfterCommit(status);
            }
            finally {
                triggerAfterCompletion(status, TransactionSynchronization.STATUS_COMMITTED);
            }

        }
        finally {
            cleanupAfterCompletion(status);
        }
}