作者:白狼
出处:http://www.manks.top/article/yii2_common_problem_resolve
本文版权归作者,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。
yii2 遇到的问题解决
1、测试项目列表,id搜索,显示
1052 Column 'id' in where clause is ambiguous
The SQL being executed was: SELECT COUNT(*) FROM `test_items` LEFT JOIN `test_cat` ON `test_items`.`test_cat_id` = `test_cat`.`id` WHERE `id`=‘1'
解决方式:
TestItemsSearch.php search方法关于id的搜索前面增加表名,
//当前表 test_items,连接表 test_cat
$query = TestItems::find();
$query->joinWith(['testCat']);
......
$query->andFilterWhere([
'test_items.id' => $this->id, //注意到这里id前面添加表名以便区分哪个表的id
...... //其他代码照写
]);
2、DetailView ‘content:ntext’,这种的attribute带标签,但是在DetailView就是想按照html的样式显示,怎么搞喃?
<?= DetailView::widget([
'model' => $model,
'attributes' => [
'desc:ntext', //gii 默认生成text字段:
[
'attribute' => 'desc',
'format' => 'html', //显示html样式的方案
'value' => $model->desc,
],
],
]) ?>
源码追踪:
//yii\widgets\DetailView;
//yii\i18n\Formatter.php
//查看DetailView,找到 yii\i18n\Formatter.php文件,各种format都可以解决:
public function format($value, $format)
{
......
$method = 'as' . $format;
......
}
......
public function asHtml($value, $config = null)
{
......
}
3、DetailView,显示的内容添加链接可以跳转,类文件同问题2,解决犯案如下:
DetailView::widget([
'model' => $model,
'attributes' => [
......
[
'attribute' => '用户',
'format' => 'raw',
'value' => Html::a($model->name, ['user-login/view', 'id' => $model->uid]),
],
],
]);
4、yii2脚本自动执行的时候,服务器上执行crontab -e 打开文件添加执行命令即可
5、问题:取分组中每组中最新的数据
原解决方案(效率很低):
select `id`, `test_items_id`, `create_time`, `score` from `test_result` where id in (select SUBSTRING_INDEX(GROUP_CONCAT(id order by `id` desc),',',1) FROM `test_result` where `uid` = {$uid} group by test_items_id
)
order by `id` desc
优化方案(仍然很慢,但是有效果):
select `id`, `test_items_id`, `create_time`, `score` from `test_result` where id in (select max(id) FROM `test_result` where `uid` = {$uid} group by test_items_id
)
order by `id` desc
二次优化方案(拆分sql):
$db = Yii::app()->db;
$sql = "select max(`id`) m
FROM `test_result` where `uid` = {$uid}
group by `test_items_id`;$res = $db->createCommand($sql)->queryAll();
$temp = '';
if ($res)
{
foreach ($res as $v)
{
$temp .= $v['m'].',';
}
$temp = rtrim($temp, ',');
$sql = "select `id`, `test_items_id`, `create_time`, `score` from
`test_result` where id in ({$temp}) order by `id` desc";
$lastInfo = $db->createCommand($sql)->queryAll();
}
来源:oschina
链接:https://my.oschina.net/u/2486665/blog/517197