PDO方法会失败并且不会引发PDOException吗? [英] Can PDO methods fail and not throw PDOException?

问题描述

我正在调整为PHP/5.2编写的旧数据库类，该类旨在连接到MySQL并隐藏所有错误.我已将PDO实例配置为引发异常:

I'm tweaking a legacy database class written for PHP/5.2 that was designed to connect to MySQL and hide all errors. I've configured the PDO instance to throw exceptions:

 new PDO($dsn, $user, $pass, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION))

现在，我需要相应地调整代码，以处理函数可能会抛出异常的情况，因此，请阅读手册.

Now I need to adjust my code accordingly to handle the case where functions can throw an exception where they wouldn't before so I head to the manual.

在某些情况下，该手册是明确的，例如PDO::prepare:

In some cases the manual is explicit, e.g. PDO::prepare:

如果数据库服务器成功准备了该语句， PDO::prepare()返回PDOStatement对象.如果数据库服务器 无法成功准备语句，PDO::prepare() 返回 FALSE或发出PDOException(取决于错误处理).

If the database server successfully prepares the statement, PDO::prepare() returns a PDOStatement object. If the database server cannot successfully prepare the statement, PDO::prepare() returns FALSE or emits PDOException (depending on error handling).

在其他情况下，它有点含糊不清，例如PDO::commit:

In other cases it's kind of vague, e.g. PDO::commit:

成功返回TRUE或失败返回FALSE.
抛出PDOException 如果没有有效的交易.

Returns TRUE on success or FALSE on failure.
Throws a PDOException if there is no active transaction.

(它是否可能由于其他原因而失败，仅返回false?)

(Can it fail for some other reason and simply return false?)

在某些情况下，甚至没有提到例外情况，例如PDO::bindValue:

And there're cases when exceptions are not even mentioned, e.g. PDO::bindValue:

成功返回TRUE，失败返回FALSE.

...即使可以确认是否确实在错误(至少在某些错误)上抛出了PDOException.

... even though it's clear to verify that it does throw PDOException on error (at least, on certain errors).

如果手册中没有其他说明，我是否仍需要检查在错误时返回false的方法的返回值?

Do I still need to check the return value of methods that return false on error when the manual doesn't say otherwise?

推荐答案

不，当您设置PDO::ERRMODE_EXCEPTION时，总是会出现任何错误的异常

No, when you set PDO::ERRMODE_EXCEPTION there will be always exception for any errors

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