如何获取 phalcon 中具有最大列值的记录?
How to fetch a record having max column value in phalcon?
我正在尝试获取具有最大 faq_order
列的 row/record。
场景:我有一个tablefaq_category
,它包含一个字段faq_order
。 FAQ_ORDER列负责存放订单号。
在 faq_category
中创建新记录时,我想设置 faq_order
但它应该具有最新值。即假设是否有 2 个以前的记录,以便记录将分别具有 faq_order 值 1、2!现在在第三条新记录上它应该将 faq_order 设置为 3 但我尝试了下面的代码但没有找到正确的方法。
保存功能:
public function saveGeneralFaqCategoryAction(){
// Instantiate new form for EbFaqCategoryModel
$form = new EbFaqCategoryForm();
if( $form ->isValid($this->request->getPost())){
// Get the FAQ Category id (if any)
$id = $this->request->get( 'id', null );
// Get existing FAQ Category (if any) or create a new one
if( null !== $id && $id !== '' ) {
$faqCategory = EbFaqCategoryModel::findFirst( $id );
} else {
// Here we create new instance and I'm stuck here!
// Logic in my mind is get max order and +1 it and then save it
// in new instance
$faqCategory = new EbFaqCategoryModel();
//$maxOrder = EbFaqCategoryModel::get();
$faqCategory->setFaqOrder(); // On new I want to set max value
}
// Bind form with post data
$form->bind( $this->request->getPost(), $faqCategory );
$faqCategory->save();
} else {
// Send error Json response
return CxHelper::SendJsonError($form->getHtmlFormattedErrors());
}
// Return success
return array( 'data' => 'Success' );
}
型号:
/**
* Get Current Max Order
*
* @return array
*/
public static function getCurrentMaxOrder(){
$queryBuilder = new Builder();
return $queryBuilder
->from(array('c' => static::class))
->columns('c.*')
->where('c.faq_order', MAX) // HERE I want to get a Record having faq_order max
->orderBy("c.date_created desc")
->getQuery()
->execute()->setHydrateMode(Resultset::HYDRATE_ARRAYS)
->toArray();
}
您应该使用 ORM 聚合函数:https://docs.phalconphp.com/3.2/en/db-models#generating-calculations
这是一种方法:
function beforeValidationOnCreate()
{
$this->faq_order = \YourModelClassame::maximum([
'column' => 'faq_order'
]) + 1;
}
这样,当您从此 table 创建记录时,它将始终具有最高的 faq_order
值 :)
我正在尝试获取具有最大 faq_order
列的 row/record。
场景:我有一个tablefaq_category
,它包含一个字段faq_order
。 FAQ_ORDER列负责存放订单号。
在 faq_category
中创建新记录时,我想设置 faq_order
但它应该具有最新值。即假设是否有 2 个以前的记录,以便记录将分别具有 faq_order 值 1、2!现在在第三条新记录上它应该将 faq_order 设置为 3 但我尝试了下面的代码但没有找到正确的方法。
保存功能:
public function saveGeneralFaqCategoryAction(){
// Instantiate new form for EbFaqCategoryModel
$form = new EbFaqCategoryForm();
if( $form ->isValid($this->request->getPost())){
// Get the FAQ Category id (if any)
$id = $this->request->get( 'id', null );
// Get existing FAQ Category (if any) or create a new one
if( null !== $id && $id !== '' ) {
$faqCategory = EbFaqCategoryModel::findFirst( $id );
} else {
// Here we create new instance and I'm stuck here!
// Logic in my mind is get max order and +1 it and then save it
// in new instance
$faqCategory = new EbFaqCategoryModel();
//$maxOrder = EbFaqCategoryModel::get();
$faqCategory->setFaqOrder(); // On new I want to set max value
}
// Bind form with post data
$form->bind( $this->request->getPost(), $faqCategory );
$faqCategory->save();
} else {
// Send error Json response
return CxHelper::SendJsonError($form->getHtmlFormattedErrors());
}
// Return success
return array( 'data' => 'Success' );
}
型号:
/**
* Get Current Max Order
*
* @return array
*/
public static function getCurrentMaxOrder(){
$queryBuilder = new Builder();
return $queryBuilder
->from(array('c' => static::class))
->columns('c.*')
->where('c.faq_order', MAX) // HERE I want to get a Record having faq_order max
->orderBy("c.date_created desc")
->getQuery()
->execute()->setHydrateMode(Resultset::HYDRATE_ARRAYS)
->toArray();
}
您应该使用 ORM 聚合函数:https://docs.phalconphp.com/3.2/en/db-models#generating-calculations
这是一种方法:
function beforeValidationOnCreate()
{
$this->faq_order = \YourModelClassame::maximum([
'column' => 'faq_order'
]) + 1;
}
这样,当您从此 table 创建记录时,它将始终具有最高的 faq_order
值 :)