Question

我有实体用户和实体角色。他们有很多关系。

User user = new User(password.toString(), null, email, mobileNumber, 
                organisation, false);
userDAO.create(user);

当我插入一个用户时，同时我用它添加一个角色，所以hibernate执行下一个：

insert into user .....
insert into user_role_link ....

问题是当我向用户插入null角色时，第一个语句成功执行，因为我希望第二个语句启动错误。虽然它启动了一个异常，但是我的代码继续运行，但是如果出现问题，我想在第二个语句中捕获此异常。我怎样才能做到这一点？谢谢！

修改

例外是com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'role_id' cannot be null

如果我发现异常，则会发送电子邮件和短信。如果在第一个插入中强制执行错误，则执行会停止，但它不会在第二个转换语句中发生。

public void registerUser(String email, String mobileNumber, Role role, String organisation) throws MessagingException {
        char[] password = RandomStringUtils.random(10, 0, 0, true, true, null, 
                new SecureRandom()).toCharArray();
        User user = new User(password.toString(), null, email, mobileNumber, 
                organisation, false);
        password = null;
        try {
            userDAO.create(user);

            String token = UUID.randomUUID().toString();
            VerificationToken verificationToken = new VerificationToken(token, user);
            verificationTokenDAO.create(verificationToken);

            Map<String, Object> model = new HashMap<>();
            model.put("token", token);
            String bodyHTML = VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, "/com/port80/sftp/email/confirmregistration.vm", "UTF-8", model);
            String bodyTxt = VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, "/com/port80/sftp/email/confirmregistration_plain.vm", "UTF-8", model);
            emailSender.sendEmail(email, "subject", bodyTxt, bodyHTML);

            smsSender.sendSMS(mobileNumber);
        } catch (Exception e) {
            System.out.println("-------------------Catch Exception------------------------");
        }

    }

Answer 1

从它的外观来看，你只需要使用try-catch块（如果我正确理解你）。像这样：

 User user = new User(password.toString(), null, email, mobileNumber, 
            organisation, false);
 try
 {
      userDAO.create(user);
 }
 catch(Exception e)
 {
       //Handle your exception here.
       //I recommend catching just your specific exception. Otherwise, you can grab exceptions and never know about them.
       //I would put it here for you, but you didn't specify what was being thrown.
 }

捕获异常第二次插入关系表（多对多）

1 个答案: