forked from dropbox/godropbox
/
types.go
79 lines (60 loc) · 1.18 KB
/
types.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
74
75
76
77
78
79
package sqlbuilder
import (
"bytes"
)
type Clause interface {
SerializeSql(out *bytes.Buffer) error
}
// A clause that can be used in order by
type OrderByClause interface {
Clause
isOrderByClauseInterface
}
// An expression
type Expression interface {
Clause
isExpressionInterface
}
type BoolExpression interface {
Clause
isBoolExpressionInterface
}
// A clause that is selectable.
type Projection interface {
Clause
isProjectionInterface
SerializeSqlForColumnList(out *bytes.Buffer) error
}
//
// Boiler plates ...
//
type isOrderByClauseInterface interface {
isOrderByClauseType()
}
type isOrderByClause struct {
}
func (o *isOrderByClause) isOrderByClauseType() {
}
type isExpressionInterface interface {
isExpressionType()
}
type isExpression struct {
isOrderByClause // can always use expression in order by.
}
func (e *isExpression) isExpressionType() {
}
type isBoolExpressionInterface interface {
isExpressionInterface
isBoolExpressionType()
}
type isBoolExpression struct {
}
func (e *isBoolExpression) isBoolExpressionType() {
}
type isProjectionInterface interface {
isProjectionType()
}
type isProjection struct {
}
func (p *isProjection) isProjectionType() {
}