Question

假设我们有此代码

count（）函数的结果是关于每个查询或查询之后的执行然后计数函数返回结果？

select distinct this.dtncode as y0, this.dtname11 as y1 
from village_master this
order by this.dtname11 asc

Answer 1

$model=Model::query()

    foreach ($Entities as $entity) {
        $model->orWhereBetween("id",$entity->first_id,$entity->last_id])
    }

//$model - object of query builder
$model->count();

它将生成一个查询并在数据库端进行计算：SELECT COUNT(*) FROM table WHERE id BETWEEN ? AND ? OR id BETWEEN ? AND ? OR id BETWEEN ? AND ?

Answer 2

萨拉姆，
答案：这取决于您何时调用计数方法！
在您的代码中：

alter table EBSIEMSTransfernew
    add batchnumber = datediff(day, '2019-05-04', invoice_date);

希望对您有所帮助：）

laravel中的计数功能机制

2 个答案: