php - MySql 查询在 PHPmyadmin 中工作，但在 codeigniter 中不工作

Question

当我尝试在单个查询中使用 5 个表从数据库中获取数据时，我正在 codeigniter 项目中工作。

在 phpmyadmin 中，sql 查询工作正常，但 codeigniter 查询不工作。

我的 Phpmyadmin 查询:

select sma_sales.date, sma_sales.reference_no, biller, sma_companies.name as DeliveryRep,customer,c.code, 
GROUP_CONCAT(CONCAT(sma_sale_items.product_name, ' (', sma_sale_items.quantity, ')') SEPARATOR '\n') as iname, 
grand_total, paid, sma_payments.amount as pyname, 
payment_status
from sma_sales
left outer join sma_sale_items on sma_sale_items.sale_id=sma_sales.id
left outer join sma_companies on sma_companies.id=sma_sales.delivered_id
left outer join sma_companies as c on c.id=sma_sales.customer_id
left outer join sma_warehouses on sma_warehouses.id=sma_sales.warehouse_id
left outer join sma_payments on sma_payments.sale_id=sma_sales.id
group by sma_sales.id

我的 Codeigniter 查询:

->select("date, reference_no, biller, companies.name as DeliveryRep,customer,c.code, "
                        . "GROUP_CONCAT(CONCAT(" . $this->db->dbprefix('sale_items') . ".product_name,"
                        . " ' (', " . $this->db->dbprefix('sale_items') . ".quantity, ')') SEPARATOR '\n') as iname,"
                        . " grand_total, paid,payments.amount as pyname, payment_status", FALSE)
                ->from('sales')
                ->join('sale_items', 'sale_items.sale_id=sales.id', 'left')
                ->join('companies', 'companies.id=sales.delivered_id', 'left')
                ->join('companies as c', 'c.id=sales.customer_id', 'left')
                ->join('warehouses', 'warehouses.id=sales.warehouse_id', 'left')
                ->join('payments', 'payments.sale_id=sales.id', 'left')
                ->group_by('sales.id')
$q = $this->db->get();

sma 只不过是数据库前缀

Answer 1

需要在表名中添加sma，它是表名的一部分。

查询:

$this->db->select("date, reference_no, biller, sma_companies.name as DeliveryRep,customer,c.code, "
                            . "GROUP_CONCAT(CONCAT(" . $this->db->dbprefix('sale_items') . ".product_name,"
                            . " ' (', " . $this->db->dbprefix('sale_items') . ".quantity, ')') SEPARATOR '\n') as iname,"
                            . " grand_total, paid,sma_payments.amount as pyname, payment_status", FALSE)
                    ->from('sma_sales')
                    ->join('sma_sale_items', 'sma_sale_items.sale_id=sma_sales.id', 'left')
                    ->join('sma_companies', 'sma_companies.id=sma_sales.delivered_id', 'left')
                    ->join('sma_companies as c', 'c.id=sma_sales.customer_id', 'left')
                    ->join('sma_warehouses', 'sma_warehouses.id=sma_sales.warehouse_id', 'left')
                    ->join('sma_payments', 'sma_payments.sale_id=sales.id', 'left')
                    ->group_by('sales.id')
    $q = $this->db->get();

您可以通过搜索调试查询并将其设置为 true，

$db['default']['db_debug'] = true;

在你的 config/database.php 中

结论:问题出在表名的别名中，修复别名后一切正常。