This repository has been archived by the owner on Dec 22, 2023. It is now read-only.
/
sort.go
73 lines (64 loc) · 1.92 KB
/
sort.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
// Copyright 2015-present Oursky Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package builder
import (
"errors"
"fmt"
"github.com/skygeario/skygear-server/pkg/server/skydb"
)
func SortOrderBySQL(alias string, sort skydb.Sort) (string, error) {
var expr string
switch sort.Expression.Type {
case skydb.KeyPath:
expr = fullQuoteIdentifier(alias, sort.Expression.Value.(string))
case skydb.Function:
var err error
expr, err = funcOrderBySQL(alias, sort.Expression.Value.(skydb.Func))
if err != nil {
return "", err
}
default:
return "", errors.New("invalid Sort: specify either KeyPath or Func")
}
order, err := sortOrderOrderBySQL(sort.Order)
if err != nil {
return "", err
}
return fmt.Sprintf(expr + " " + order), nil
}
// due to sq not being able to pass args in OrderBy, we can't re-use funcToSQLOperand
func funcOrderBySQL(alias string, fun skydb.Func) (string, error) {
switch f := fun.(type) {
case skydb.DistanceFunc:
sql := fmt.Sprintf(
"ST_Distance_Sphere(%s, ST_MakePoint(%f, %f))",
fullQuoteIdentifier(alias, f.Field),
f.Location.Lng(),
f.Location.Lat(),
)
return sql, nil
default:
return "", fmt.Errorf("got unrecgonized skydb.Func = %T", fun)
}
}
func sortOrderOrderBySQL(order skydb.SortOrder) (string, error) {
switch order {
case skydb.Asc:
return "ASC", nil
case skydb.Desc:
return "DESC", nil
default:
return "", fmt.Errorf("unknown sort order = %v", order)
}
}