php – Phalcon性能相关查询

2019-06-09 15:10:52 阅读：224 来源： 互联网

我正在为我创建2个模型的端点/项目的输出构建REST API：

项目：

class Projects extends BaseModel
{
    public function initialize()
    {
        $this->hasMany('id', 'Participants', 'projectId');
    }
}

参与者：

class Participants extends BaseModel
{
    public function initialize()
    {
        $this->belongsTo('projectId', 'Projects', 'id');
    }
}

可以说,我有10个项目：(1个查询)

$results = Projects::find();

我遍历了所有10个,但我也想要所有参与者：

foreach($results as $result) {
    echo $result->participants; // 1 query
}

因此,在循环结束时,Phalcon为每个项目进行了额外的查询.

这些查询是通过在迭代10个项目时访问$result->参与者来完成的：

SELECT IF(COUNT(*)>0, 1 , 0) FROM `INFORMATION_SCHEMA`.`TABLES` WHERE `TABLE_NAME`='projects'
DESCRIBE `projects`
SELECT `projects`.`id`, `projects`.`title`, `projects`.`client`, `projects`.`color`, `projects`.`start_date`, `projects`.`end_date`, `projects`.`notes`, `projects`.`stateId`, `projects`.`created_at`, `projects`.`updated_at` FROM `projects`
SELECT IF(COUNT(*)>0, 1 , 0) FROM `INFORMATION_SCHEMA`.`TABLES` WHERE `TABLE_NAME`='project_participants'
DESCRIBE `project_participants`
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0
SELECT `project_participants`.`id`, `project_participants`.`project_id`, `project_participants`.`user_id`, `project_participants`.`user_role_id`, `project_participants`.`user_state_id`, `project_participants`.`updated_at`, `project_participants`.`created_at` FROM `project_participants` WHERE `project_participants`.`project_id` = :0

题

有没有办法事先查询关系,所以它将是一个查询.
当我使用Phalcon提供的查询生成器时,我无法以相同的方式访问 – >参与者.

编辑

我最终使用了Query Builder,命名所有列

$builder = $modelsManager->createBuilder();
$builder->columns($columns)
        ->from('Projects')
        ->leftJoin('Participants')
        ->getQuery()
        ->execute();

像这样的列：

Projects.id as projects_id
...
Participants.id as participants_id
Participants.projectId as participants_projectId

因为在查询生成器创建的结果上访问 – >参与者,所以也进行了额外的查询.

解决方法:

要使用QueryBuilder以相同的方式访问 – >参与者,您必须构建连接到Query.

代码示例可能是这样的：

$queryBuilder = $this->getDI()->getModelsManager()
    ->createBuilder()
    ->columns(['p.id','participants.*'])
    ->addFrom('Entity\Projects', 'p')
    ->leftJoin('Entity\Participants', 'participants.projectId = p.id', 'participants')
    ->groupBy('p.id, participants.id')
    ->orderBy('p.id ASC');

$resultSet = $queryBuilder->getQuery()->execute();

groupBy()by在这里用于使结果可能是多维的.

这种查询(在PgSQL下测试)使得Phalcon在项目p的Resultsets中为参与者pi创建了一些后续的ResultSet对象.

您仍然可以使用foreach()迭代它,但毕竟,我不确定它是否确实减少了最终查询计数.

Fireing $result = $resultSet-> toArray()使$result [‘pi’]保持为Resultset,所以你应该保持谨慎.您可以通过在columns()参数中定义精确列来强制它作为数组转储.它有它的缺点 – 你将不再从groupBy()获益,至少在Phalcon 1.3.2和PHP 5.5.3 im运行在这里.

标签：json,php,mysql,phalcon
来源： https://codeday.me/bug/20190609/1205738.html

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php – Phalcon性能相关查询