有没有办法从mysql字段中检索索引中提取php数组值?
我的意思是,我有这两张桌子:
vechicle_types表:
vt_id | vt_type
1 | car
2 | van
3 | truck
4 | bike
vechicles表:
vehicle_brand | vechicle_model | vehicle_type
brand 1 | model 1 | 1
brand 1 | model 2 | 3
brand 1 | model 3 | 2
brand 2 | model 1 | 4
brand 2 | model 2 | 1
brand 2 | model 3 | 4
然后,我通过一些函数在一些计算中动态生成了一个tax数组($arr_taxes
),所以它不能存储在数据库表中,因为这些值是内联计算的
现在我想根据存储在数据库中的车辆类型(vehicle_tax
)创建一个从$arr_taxes
中提取的值的SQL变量(vehicle_type
)
这是我的代码,当然它不起作用:
$arr_taxes=(1=>10, 2=>15, 3=>20, 4=>12); # this array is dinamically generated previously from some calculations
$var_query="SELECT vehicle_brand, vechicle_model, vehicle_type, {$arr_taxes[vechicle_type]} as vehicle_tax FROM vehicles";
有没有办法完成我的需要?
提前谢谢
更新信息:
实际上,表格更像是
vehicle_brand | vechicle_model | vehicle_type | vehicle_price
brand 1 | model 1 | 1 | 300
brand 1 | model 2 | 3 | 150
brand 1 | model 3 | 2 | 200
brand 2 | model 1 | 4 | 100
brand 2 | model 2 | 1 | 300
brand 2 | model 3 | 4 | 600
然后,查询应如下所示:
$var_query="SELECT vehicle_brand, vechicle_model, vehicle_type, vehicle_price, {$arr_taxes[vechicle_type]} as vehicle_tax, (vehicle_price+(vehicle_price*({$arr_taxes[vechicle_type]}/100)) as vehicle_finalprice FROM vehicles ORDER BY vehicle_finalprice";