Php 如何在yii2中编写sql查询

我有一个原始的sql查询，我使用yii2

Yii:：$app->db->createCommand（）

运行它，但我想知道如何使用Yii编写查询的方法来实现同样的事情

 $m = "SELECT p.basic_plan_amt AS basic,p.premium_plan_amt AS premium,p.daju_plan_amt AS daju,c.name 
 AS country FROM price p LEFT JOIN country c ON p.country_id = c.id WHERE p.country_id = " .$country_id; 

虽然上面的查询运行良好，并提供了预期的结果，但如何使用下面的格式编写相同的查询

$model = \backend\models\Price::find()->select([p.basic_plan_amt AS basic,p.premium_plan_amt AS 
premium,p.daju_plan_amt AS daju,c.name 
AS country])->where(['country_id' => $country_id])->all();

---

下面是yii中的查询示例，希望对您有所帮助

关系模型

$model = User::find()
        ->with('comments')
        ->all();
foreach ($model as $user) {
    // get data from relation model
    $comments = $user->comments;
        ......
    foreach($comments as $comment){
        ........
    }
}

joinWith（） 示例1:

$model = User::find()
        ->joinWith('comments')
        ->all();

$model = User::find()
        ->joinWith('comments')
        ->orderBy('tbl_comments_id.id, tbl_user.id')
        ->all();

$query = new Query;
$query  ->select([
        'tbl_user.username AS name', 
        'tbl_category.categoryname as  Category',
        'tbl_document.documentname']
        )  
        ->from('tbl_user')
        ->join('LEFT OUTER JOIN', 'tbl_category',
            'tbl_category.createdby =tbl_user.userid')      
        ->join('LEFT OUTER JOIN', 'tbl_document', 
            'tbl_category.cid =tbl_document.did')
        ->LIMIT(5)  ; 

$command = $query->createCommand();
$data = $command->queryAll();

$query = new Query;
$query  ->select(['tbl_user.username AS name', 'tbl_category.type as Category'])  
        ->from('tbl_user')
        ->leftJoin('tbl_category', 'tbl_category.createdby = tbl_user.userid')
        ->limit(2); 

$command = $query->createCommand();
$data = $command->queryAll();

示例2:

$model = User::find()
        ->joinWith('comments')
        ->all();

$model = User::find()
        ->joinWith('comments')
        ->orderBy('tbl_comments_id.id, tbl_user.id')
        ->all();

$query = new Query;
$query  ->select([
        'tbl_user.username AS name', 
        'tbl_category.categoryname as  Category',
        'tbl_document.documentname']
        )  
        ->from('tbl_user')
        ->join('LEFT OUTER JOIN', 'tbl_category',
            'tbl_category.createdby =tbl_user.userid')      
        ->join('LEFT OUTER JOIN', 'tbl_document', 
            'tbl_category.cid =tbl_document.did')
        ->LIMIT(5)  ; 

$command = $query->createCommand();
$data = $command->queryAll();

$query = new Query;
$query  ->select(['tbl_user.username AS name', 'tbl_category.type as Category'])  
        ->from('tbl_user')
        ->leftJoin('tbl_category', 'tbl_category.createdby = tbl_user.userid')
        ->limit(2); 

$command = $query->createCommand();
$data = $command->queryAll();

innerJoinWith（）

Join（）

示例1:

$model = User::find()
        ->joinWith('comments')
        ->all();

$model = User::find()
        ->joinWith('comments')
        ->orderBy('tbl_comments_id.id, tbl_user.id')
        ->all();

$query = new Query;
$query  ->select([
        'tbl_user.username AS name', 
        'tbl_category.categoryname as  Category',
        'tbl_document.documentname']
        )  
        ->from('tbl_user')
        ->join('LEFT OUTER JOIN', 'tbl_category',
            'tbl_category.createdby =tbl_user.userid')      
        ->join('LEFT OUTER JOIN', 'tbl_document', 
            'tbl_category.cid =tbl_document.did')
        ->LIMIT(5)  ; 

$command = $query->createCommand();
$data = $command->queryAll();

$query = new Query;
$query  ->select(['tbl_user.username AS name', 'tbl_category.type as Category'])  
        ->from('tbl_user')
        ->leftJoin('tbl_category', 'tbl_category.createdby = tbl_user.userid')
        ->limit(2); 

$command = $query->createCommand();
$data = $command->queryAll();

输出查询

SELECT `tbl_user`.`username` AS `name`, `tbl_category`.`categoryname` AS `Category` 
FROM `tbl_user` 
LEFT OUTER JOIN `tbl_category` ON tbl_category.createdby =tbl_user.userid 
LEFT OUTER JOIN `tbl_document` ON tbl_category.cid =tbl_document.did 
LIMIT 5

SELECT `tbl_user`.`username` AS `name`, `tbl_category`.`type` AS `Category`
FROM `tbl_user` 
LEFT JOIN `tbl_category` ON tbl_category.createdby = tbl_user.useridd 
LIMIT 2     

leftJoin（） 示例1:

$model = User::find()
        ->joinWith('comments')
        ->all();

$model = User::find()
        ->joinWith('comments')
        ->orderBy('tbl_comments_id.id, tbl_user.id')
        ->all();

$query = new Query;
$query  ->select([
        'tbl_user.username AS name', 
        'tbl_category.categoryname as  Category',
        'tbl_document.documentname']
        )  
        ->from('tbl_user')
        ->join('LEFT OUTER JOIN', 'tbl_category',
            'tbl_category.createdby =tbl_user.userid')      
        ->join('LEFT OUTER JOIN', 'tbl_document', 
            'tbl_category.cid =tbl_document.did')
        ->LIMIT(5)  ; 

$command = $query->createCommand();
$data = $command->queryAll();

$query = new Query;
$query  ->select(['tbl_user.username AS name', 'tbl_category.type as Category'])  
        ->from('tbl_user')
        ->leftJoin('tbl_category', 'tbl_category.createdby = tbl_user.userid')
        ->limit(2); 

$command = $query->createCommand();
$data = $command->queryAll();

输出查询

SELECT `tbl_user`.`username` AS `name`, `tbl_category`.`categoryname` AS `Category` 
FROM `tbl_user` 
LEFT OUTER JOIN `tbl_category` ON tbl_category.createdby =tbl_user.userid 
LEFT OUTER JOIN `tbl_document` ON tbl_category.cid =tbl_document.did 
LIMIT 5

SELECT `tbl_user`.`username` AS `name`, `tbl_category`.`type` AS `Category`
FROM `tbl_user` 
LEFT JOIN `tbl_category` ON tbl_category.createdby = tbl_user.useridd 
LIMIT 2     

使用createcommand（）方法：

使用yii\db\Query$连接=\Yii:：$app->db$查询=新查询$insql=$connection->createCommand（“从清单中选择*）；$$result=$insql->queryAll（）

---

上面的方法列出了清单表中的所有数据。

您的问题是“是否可以使用方法创建sql请求？”" ? 如果是这样的话，你是否检查过yii文档：@Lucas Gras我知道这是可能的，但我不知道如何实现这一点，这是我的问题，需要有人帮我接通。谢谢你的意思是如何在ActiveRecord中编写

join（）

？@是的，如何在表和列上使用别名，以及如何编写join语句