从golang中的参数调用const [关闭]

Question

so I want to make my project having a project sets like this

 GoTraining
   -Controllers
       ListController
   -Service
       ListService that doing business process and
       calling data Access Object (DAO) to get data
   -DAO
       List query and Model(Const)
   -.gitignore
   -config.conf
   -main.go
   -readme.md

that just the picture of my structure , and now come where I get confused I create a package in dao called customerDao.go and write all of my query inside const and I try to make a function called queryFilter with queryType as the parameter and I want to search the const base on the queryType I got as parameter for some reason it give me an error message said that

"Syntax Error : unexpected const, expecting expression(8,16)"

can anyone tell me what I do wrong here?

Answer 1

It seems you're assuming that queryGetAllCustomer "belongs to" const. Const is not a scope but just an access modifier though, these two snippets produce identical results:

const (
    queryGetAllCustomer = "..."
    queryGetOneCustomer = "..."
)

// and...

const queryGetAllCustomer = "..."
const queryGetOneCustomer = "..."

You can therefore simply reference the value with queryGetAllCustomer (or dao.QueryGetAllCustomer from another package, had it been exported):

queryText := queryGetAllCustomer