I'm trying to implement the jquery datatables server side processing in Golang. Part of that needs a generic method to select data from DB. I've posted a simplified version of what I've done below.
package main
import (
"gopkg.in/gorp.v1"
"database/sql"
_ "github.com/go-sql-driver/mysql"
)
type User struct {
TenantId int `db:"tenantid"json:"tenantid"`
Username string `db:"username"json:"username"`
Password string `json:"password"`
}
func GenericSelect(database string, table string, columns []string, result interface{})interface{} {
dbMap := getDBConnection(database);
defer dbMap.Db.Close()
var err error
query := "SELECT "
for index,element := range columns {
query += element
if(index+1 != len(columns)){
query += ","
}
}
query += " FROM " + table + " LIMIT 1,100"
_, err = dbMap.Select(&result, query)
if err != nil {
panic(err.Error()) // Just for example purpose.
}
return result
}
func getDBConnection(dbname string) *gorp.DbMap {
var connectionUrl string
connectionUrl = "root:root@tcp(localhost:3306)/" + dbname
db, err := sql.Open("mysql", connectionUrl)
if err != nil {
panic(err.Error()) // Just for example purpose.
}
dbmap := &gorp.DbMap{Db: db, Dialect:gorp.MySQLDialect{"InnoDB", "UTF8"}}
return dbmap
}
func main(){
var users []User
columns := []string{"tenantid", "username", "password"}
result := GenericSelect("portal","accounting",columns, &users)
//make result in to a json instead of print
print(result)
}
Once I run this, it throws the following error,
panic: gorp: Cannot SELECT into this type: *interface {}
goroutine 1 [running]:
main.GenericSelect(0x6b1c30, 0x6, 0x6bd490, 0xa, 0xc208073f60, 0x3, 0x3, 0x5e8e60, 0xc20801e260, 0x0, ...)
/home/anuruddha/Desktop/go-lang/main.go:30 +0x37f
According to the error, Select() is not accepting interfaces. Is it possible to achieve this level of generality in golang? Appreciate if you can direct me to get this working?
