Demo1 - 代码实现 - PROPAGATION_REQUIRED

• web层调service的方法没有加事务，service中的事务传播机制为PROPAGATION_REQUIRED，故service中的方法受事务控制，数据保存失败；
• PROPAGATION_REQUIRED
  • A有，B不新建事务
  • A没有，B新建事务

package com.example.demo.service;

import com.example.demo.dao.CustomerRepository;
import com.example.demo.domain.Customer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;

@Service
public class CustomerServiceTxInCode {

    private static final Logger LOG = LoggerFactory.getLogger(CustomerServiceTxInCode.class);

    @Autowired
    private CustomerRepository customerRepository;
    @Autowired
    private PlatformTransactionManager transactionManager;

    public Customer create(Customer customer) {
        LOG.info("CustomerService In Code create customer:{}", customer.getUsername());
        if (customer.getId() != null) {
            throw new RuntimeException("用户已经存在");
        }
        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
        def.setIsolationLevel(TransactionDefinition.ISOLATION_SERIALIZABLE);
        def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
        def.setTimeout(15);
        TransactionStatus status = transactionManager.getTransaction(def);
        try {
            customer.setUsername("Code:" + customer.getUsername());
            customerRepository.save(customer);

            System.out.print(10/0);

            transactionManager.commit(status);
            return customer;
        } catch (Exception e) {
            transactionManager.rollback(status);
            throw e;
        }
    }

}

Demo2 - 代码实现 - PROPAGATION_SUPPORTS

• web层调service的方法没有加事务，service中的事务传播机制为PROPAGATION_SUPPORTS，故service中的方法不受事务控制，数据保存成功；
• PROPAGATION_SUPPORTS
  • A有B就有
  • A没有B就没有

package com.example.demo.service;

import com.example.demo.dao.CustomerRepository;
import com.example.demo.domain.Customer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;

@Service
public class CustomerServiceTxInCode {

    private static final Logger LOG = LoggerFactory.getLogger(CustomerServiceTxInCode.class);

    @Autowired
    private CustomerRepository customerRepository;
    @Autowired
    private PlatformTransactionManager transactionManager;

    public Customer create(Customer customer) {
        LOG.info("CustomerService In Code create customer:{}", customer.getUsername());
        if (customer.getId() != null) {
            throw new RuntimeException("用户已经存在");
        }
        DefaultTransactionDefinition def = new DefaultTransactionDefinition();
        def.setIsolationLevel(TransactionDefinition.ISOLATION_SERIALIZABLE);
        def.setPropagationBehavior(TransactionDefinition.PROPAGATION_SUPPORTS);
        def.setTimeout(15);
        TransactionStatus status = transactionManager.getTransaction(def);
        try {
            customer.setUsername("Code:" + customer.getUsername());
            customerRepository.save(customer);

            System.out.print(10/0);

            transactionManager.commit(status);
            return customer;
        } catch (Exception e) {
            transactionManager.rollback(status);
            throw e;
        }
    }

}