Question

我正在尝试使用db事务进行查询。当我的方法运行该时间时，数据已正确插入相应的表中，但它返回null。

我的代码

    return $result = DB::transaction(function() use ($attributes) {
        $service = $this->service->create($attributes);
        $visibilityAttributes = $attributes['dropdown_option_id'];
        $visibilityAttributes = array_map('intval', $visibilityAttributes);
        $service->visibility()->sync($visibilityAttributes);
    },3);

Answer 1

如果要返回任何值，请尝试以下代码：

$result = DB::transaction(function() use ($attributes) {
    $service = $this->service->create($attributes);
    $visibilityAttributes = $attributes['dropdown_option_id'];
    $visibilityAttributes = array_map('intval', $visibilityAttributes);
    $service->visibility()->sync($visibilityAttributes);
    return $service;
},3);
return $result

Answer 2

DB::transaction()返回传递给它的闭包返回的内容。由于关闭没有返回任何内容，因此DB::transaction()将返回null。您需要在闭包中添加return语句。

return $result = DB::transaction(function() use ($attributes) {
    $service = $this->service->create($attributes);

    $visibilityAttributes = $attributes['dropdown_option_id'];
    $visibilityAttributes = array_map('intval', $visibilityAttributes);
    $service->visibility()->sync($visibilityAttributes);

    // This value will be returned from DB::transaction().
    return $service;
},3);

Answer 3

通过返回值oustide函数尝试下面的代码。

 $result = DB::transaction(function() use ($attributes) {
        $service = $this->service->create($attributes);
        $visibilityAttributes = $attributes['dropdown_option_id'];
        $visibilityAttributes = array_map('intval', $visibilityAttributes);
        $service->visibility()->sync($visibilityAttributes);
    },3);

return $result;

Laravel交易返回null

3 个答案: