java - 如何捕获mybatis异常 "org.apache.ibatis.exceptions.PersistenceException"？

Question

下面是代码示例，我想捕获mybatis抛出的异常:

String resource = "com/sureone/server/db/mybatis-config.xml";
Reader reader = null;
try {
    reader = Resources.getResourceAsReader(resource);
} catch (IOException e) {
    e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
}
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
sqlSession = factory.openSession(true);
tUserMapper = sqlSession.getMapper(TUserMapper.class);

if(tUserMapper.insert(user)>0){     <===Exception throwed here for duplicate entry problem 
   return verifyLogin(user.getAccount(),user.getPassword());
}
return null;

我要捕获的异常:

org.apache.ibatis.exceptions.PersistenceException: 
### Error updating database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'userName' for key 'account_UNIQUE'

Answer 1

您可以像往常一样捕获PersistenceException:

try {
  ...
} catch (PersistenceException pe) {

}

但不要忘记这个 Exception 包装了真正的异常:

来自 MyBatis 代码

} catch (Exception e) {
  throw ExceptionFactory.wrapException("Error committing transaction.  Cause: " + e, e);
}

因此，如果您想了解 PersistenceException 的原因，您必须对 PersistenceException< 使用 .getCause() 方法

注意 MyBatis 也可以启动它自己的 PersistenceException (TooManyResultException,BindingException ...) 类，那些不会有原因 Exception 包装。