Convert db backend to use Gorm, with basis for support

for Mysql and Postgres in addition to existing Sqlite

backend/internal/database/helpers.go

@@ -1,46 +1,8 @@
 package database
 
-import (
-	"fmt"
-	"strings"
-
-	"npm/internal/errors"
-	"npm/internal/model"
-	"npm/internal/util"
-)
-
 const (
 	// DateFormat for DateFormat
 	DateFormat = "2006-01-02"
 	// DateTimeFormat for DateTimeFormat
 	DateTimeFormat = "2006-01-02T15:04:05"
 )
-
-// GetByQuery returns a row given a query, populating the model given
-func GetByQuery(model interface{}, query string, params []interface{}) error {
-	db := GetInstance()
-	if db != nil {
-		err := db.Get(model, query, params...)
-		return err
-	}
-
-	return errors.ErrDatabaseUnavailable
-}
-
-// BuildOrderBySQL takes a `Sort` slice and constructs a query fragment
-func BuildOrderBySQL(columns []string, sort *[]model.Sort) (string, []model.Sort) {
-	var sortStrings []string
-	var newSort []model.Sort
-	for _, sortItem := range *sort {
-		if util.SliceContainsItem(columns, sortItem.Field) {
-			sortStrings = append(sortStrings, fmt.Sprintf("`%s` %s", sortItem.Field, sortItem.Direction))
-			newSort = append(newSort, sortItem)
-		}
-	}
-
-	if len(sortStrings) > 0 {
-		return fmt.Sprintf("ORDER BY %s", strings.Join(sortStrings, ", ")), newSort
-	}
-
-	return "", newSort
-}