Laravel:在 DB::transaction() 中使用 try...catch

问题描述

我们都使用 DB::transaction() 进行多个插入查询.这样做时，应该将 try...catch 放在里面还是包装它?如果出现问题，事务将自动失败，是否还需要包含 try...catch ?

We all use DB::transaction() for multiple insert queries. In doing so, should a try...catch be placed inside it or wrapping it? Is it even necessary to include a try...catch when a transaction will automatically fail if something goes wrong?

示例 try...catch 包装交易:

// try...catch
try {
    // Transaction
    $exception = DB::transaction(function() {

        // Do your SQL here

    });

    if(is_null($exception)) {
        return true;
    } else {
        throw new Exception;
    }

}
catch(Exception $e) {
    return false;
}

相反，一个 DB::transaction() 包装了一个 try...catch:

The opposite, a DB::transaction() wrapping a try...catch:

// Transaction
$exception = DB::transaction(function() {
    // try...catch
    try {

        // Do your SQL here

    }
    catch(Exception $e) {
        return $e;
    }

});

return is_null($exception) ? true : false;

或者只是一个没有 try...catch 的事务

Or simply a transaction w/o a try...catch

// Transaction only
$exception = DB::transaction(function() {

    // Do your SQL here

});

return is_null($exception) ? true : false;

推荐答案

如果您需要通过代码手动退出"事务(无论是通过异常还是只是检查错误状态)，您不应该使用 DB::transaction() 而是将您的代码包装在 DB::beginTransaction 和 DB::commit/DB::rollback():

In the case you need to manually 'exit' a transaction through code (be it through an exception or simply checking an error state) you shouldn't use DB::transaction() but instead wrap your code in DB::beginTransaction and DB::commit/DB::rollback():

DB::beginTransaction();

try {
    DB::insert(...);
    DB::insert(...);
    DB::insert(...);

    DB::commit();
    // all good
} catch (Exception $e) {
    DB::rollback();
    // something went wrong
}

请参阅交易文档.

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