Yii2 框架。当我在另一个 ActiveRecord 的 AFTER_INSERT_EVENT 中保存多个 ActiveRecord 时,数据库中的值更新速度不够快,因此在重定向到查看数据时会显示旧值。
更具体地说:使用 PHP 7.2.9 的标准 XAMPP 环境。我创建了一个特征,可以轻松地在模型中添加具有历史记录的额外属性(现有属性或新属性)。该特征用于 ActiveRecord。
注意函数
sleep(5)
中的TL_save
。这解决了问题,但这不是正确的解决方案。 如何确保在再次读取之前更新所有内容?我想避免在行上使用锁,因为这需要在使用表之前对其进行更改。有办法解决吗?交易 - 我已经尝试过,但可能不正确,因为它没有效果。重新加载视图页面也可以解决问题,但同样:不是很优雅:-)
另外:我应该在 GitHub 上分享此代码吗?我以前没有这样做过,并且不太确定这对其他人是否真的有任何价值。
trait TimelineTrait
{
private $timelineConfig;
public function timelineInit($config)
{
$std = [
'attributes' => [], // required
'_oldAttributes'=>[],
'datetime'=> date('Y-m-d H:i:s'),
'validationRule'=>'safe',
'table'=>$this->tableName(),
'onlyDirty'=>true, // using !=, not !==
'events'=>[
self::EVENT_AFTER_INSERT=>[$this, 'TL_EventAfterInsert'],
self::EVENT_AFTER_UPDATE=>[$this, 'TL_EventAfterUpdate'],
self::EVENT_AFTER_FIND=>[$this, 'TL_EventAfterFind'],
self::EVENT_AFTER_DELETE=>[$this, 'TL_EventAfterDelete'],
],
'TimelineClass'=>Timeline::class,
/*
Must have the following attributes
id integer primary key auto increment not null,
table varchar(64) not null,
table_id integer not null,
attribute varchar(64) not null,
datetime datetime not null
value text (can be null)
*/
];
$this->timelineConfig = array_replace_recursive($std, $config);
foreach($this->timelineConfig["events"]??[] as $trigger=>$handler)
$this->on($trigger, $handler);
}
public function __get($attr)
{
$cfg = &$this->timelineConfig;
if (in_array($attr, array_keys($cfg["attributes"])))
return $cfg["attributes"][$attr];
else
return parent::__get($attr);
}
public function __set($attr, $val)
{
$cfg = &$this->timelineConfig;
if (in_array($attr, array_keys($cfg["attributes"]))) {
$cfg["attributes"][$attr] = $val;
} else
parent::__set($attr, $val);
}
public function attributes()
{
return array_merge(parent::attributes(), $this->timelineConfig["attributes"]);
}
public function rules()
{
$temp = parent::rules();
$temp[] = [array_keys($this->timelineConfig["attributes"]), $this->timelineConfig["validationRule"]];
return $temp;
}
public function TL_EventAfterInsert($event)
{
$this->TL_save($event, true);
}
public function TL_EventAfterUpdate($event)
{
$this->TL_save($event, false);
}
private function TL_save($event, $insert)
{
$cfg = &$this->timelineConfig;
if ($cfg["onlyDirty"])
$cfg["_oldAttributes"] = $this->TL_attributesOnTime();
foreach($cfg["attributes"] as $attr=>$val) {
$a = [
'table'=>$cfg["table"],
'table_id'=>$this->id,
'attribute'=>$attr,
'datetime'=>$cfg["datetime"],
];
if ($insert)
$model=null;
else
$model = Timeline::find()->where($a)->one();
$isNew = empty($model); // this exact attribute does not exist on timeline already
if ($isNew)
$model = new $cfg["TimelineClass"]($a);
$model->value = $val;
if (!$cfg["onlyDirty"]
|| $cfg["onlyDirty"] && $model->value!=($cfg["_oldAttributes"][$attr]??\uniqid('force_true'))) {
$ok = $model->save();
if (!$ok) $this->addErrors($attr, $model->getErrorSummary());
}
}
sleep(5);
}
public function TL_EventAfterFind($event)
{
$cfg = &$this->timelineConfig;
$data = $this->TL_attributesOnTime();
foreach($data as $attr=>$val)
$cfg["attributes"][$attr] = $val;
$cfg["_oldAttributes"] = $cfg["attributes"];
}
private function TL_attributesOnTime()
{
$cfg = &$this->timelineConfig;
$timelineTable = $cfg["TimelineClass"]::tableName();
$sql = "SELECT t1.* FROM $timelineTable AS t1
LEFT JOIN (SELECT * FROM $timelineTable WHERE `table`=:table AND table_id=:table_id AND datetime<=:datetime) AS t2
ON (t1.table=t2.table and t1.table_id=t2.table_id and t1.datetime<t2.datetime AND t1.attribute=t2.attribute)
WHERE t2.id IS NULL AND t1.datetime<:datetime AND t1.table=:table AND t1.table_id=:table_id
";
$params = [
'table'=>$cfg["table"],
'table_id'=>$this->id,
':datetime'=>$cfg["datetime"],
];
$data = \Yii::$app->db->createCommand($sql,$params)->queryAll();
$data = ArrayHelper::map($data,'attribute','value');
return $data;
}
public function TL_EventAFterDelete($event)
{
$cfg = &$this->timelineConfig;
$cfg["TimelineClass"]::deleteAll([
'table'=>$cfg["table"],
'table_id'=>$event->sender->id
]);
}
}
使用示例:
<?php
namespace app\models;
class KeyTime extends Key
{
use \app\behaviors\TimelineTrait;
public function init()
{
parent::init();
$this->timelineInit([
'attributes'=>[
// default values for attributes
'keyid'=>'historic id', // this is existing attribute in Key model
'label'=>'mylabel', // label and color does not exist in Key model
'color'=>'red',
],
]);
}
}
行动更新
public function actionUpdate($id)
{
$model = $this->findModel($id);
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->redirect(['view', 'id' => $model->id]);
}
return $this->render('update', [
'model' => $model,
]);
}
在
microtime(true)
开启多次“闪烁”之后,我找到了它有时与 sleep(1)
一起工作的原因。
答案就在
TL_attributesOnTime
。 $sql
中的最后一行是
WHERE t2.id IS NULL AND t1.datetime<:datetime AND t1.table=:table AND t1.table_id=:table_id
…但应该是…
WHERE t2.id IS NULL AND t1.datetime<=:datetime AND t1.table=:table AND t1.table_id=:table_id
注意 < 更改为 <= 否则,当记录在填充的同一秒内保存时,将不会包含该记录。 希望它可以帮助别人。