学说2：当没有行时，getResult会返回什么？ 空值？

Question

I wonder what is returned by functions like get*Result() . It seems like null? Where in the docs can I find such info?

Answer 1

get*Result() methods return an empty array()
getSingle*Result() methods throw a \\Doctrine\\ORM\\NoResultException

Here are direct links to the doctrine API docs

• getResult() doctrine API docs
• getSingleResult() doctrine API docs
• getSingleScalarResult() doctrine API docs
• getOneOrNullResult() doctrine API docs

Also important exceptions:

• NoResultException doctrine API docs
• NonUniqueResultException doctrine API docs

  (must handle for getSingle*() and getOneOrNullResult() methods)

• UnexpectedResultException doctrine API docs (this is parent exception of the two above)

direct links are for 2.6, but you can find there more recent versions at the at http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/index.html

Answer 2

只需使用var_dump（），您就可以看到函数返回的内容。