在MySql db上完成回滚时，事务回滚不起作用

Question

我已通过以下方式实现了事务回滚。当我尝试在HSql DB和SQL Server上实现相同的代码时，此代码运行良好。但是在MySQL DB上实现时，相同的事务回滚不起作用。在MySQL的情况下，回滚事务的可能解决方案是什么？

这是我的代码 -

xml file-＆gt; implement.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd ">

   <!-- Initialization for data source -->
   <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
      <property name="url" value="jdbc:mysql://(mydb details)"/>
      <property name="username" value="(my db username)"/>
      <property name="password" value="(my db password)"/>
   </bean>


   <!-- Initialization for TransactionManager -->
   <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
      <property name="dataSource"  ref="dataSource" />    
   </bean>

   <!-- Definition for studentJDBCTemplate bean -->
   <bean id="implementOnlyTransactions" class="Transactions.implementOnlyTransactions">
      <property name="dataSource"  ref="dataSource" />
      <property name="transactionManager"  ref="transactionManager" />    
   </bean>

</beans>

implementOnlyTransactions.java-＆GT;

package Transactions;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionException;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.DefaultTransactionDefinition;


public class implementOnlyTransactions {
    private DataSource dataSource;
    private JdbcTemplate jdbcTemplateObject;
    private PlatformTransactionManager transactionManager;

    public void setDataSource(DataSource dataSource) throws SQLException {
        this.dataSource = dataSource;
        this.jdbcTemplateObject = new JdbcTemplate(dataSource);
    }

    public void setTransactionManager(PlatformTransactionManager transactionManager) {
        this.transactionManager = transactionManager;
    }

    public void create(Integer id, String name) throws Exception {
        TransactionDefinition def = new DefaultTransactionDefinition();
        TransactionStatus status = transactionManager.getTransaction(def);

        try {
            String SQL1 = "insert into Student (ID,Name) values (?, ?)";
            int r = jdbcTemplateObject.update(SQL1, id, name);
            System.out.println("Inserted Name = " + name + ", ID = " + id);
            if(r>0){
                transactionManager.rollback(status);
            }
             transactionManager.commit(status);

        } catch (DataAccessException e) {
            System.out.println("Error in creating record, rolling back");
            //transactionManager.rollback(status);
            throw e;
        }

    }

}

MainClass.java - ＆gt;

package Transactions;

import java.sql.SQLException;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainClass {
    public static void main(String[] args) throws Exception {
        ApplicationContext context = new ClassPathXmlApplicationContext("xmlFiles/implement.xml");

        implementOnlyTransactions implemt = 
                (implementOnlyTransactions)context.getBean("implementOnlyTransactions");

        try {
            implemt.create(36,"bye2");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}