/
diff.go
168 lines (152 loc) · 5.23 KB
/
diff.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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
// Copyright 2021-present The Atlas Authors. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package sqlite
import (
"fmt"
"reflect"
"strconv"
"strings"
"ariga.io/atlas/sql/internal/sqlx"
"ariga.io/atlas/sql/schema"
)
// A diff provides a SQLite implementation for sqlx.DiffDriver.
type diff struct{ conn }
// SchemaAttrDiff returns a changeset for migrating schema attributes from one state to the other.
func (d *diff) SchemaAttrDiff(_, _ *schema.Schema) []schema.Change {
// No special schema attribute diffing for SQLite.
return nil
}
// TableAttrDiff returns a changeset for migrating table attributes from one state to the other.
func (d *diff) TableAttrDiff(from, to *schema.Table) ([]schema.Change, error) {
var changes []schema.Change
switch {
case sqlx.Has(from.Attrs, &WithoutRowID{}) && !sqlx.Has(to.Attrs, &WithoutRowID{}):
changes = append(changes, &schema.DropAttr{
A: &WithoutRowID{},
})
case !sqlx.Has(from.Attrs, &WithoutRowID{}) && sqlx.Has(to.Attrs, &WithoutRowID{}):
changes = append(changes, &schema.AddAttr{
A: &WithoutRowID{},
})
}
return append(changes, sqlx.CheckDiff(from, to)...), nil
}
// ColumnChange returns the schema changes (if any) for migrating one column to the other.
func (d *diff) ColumnChange(from, to *schema.Column) (schema.ChangeKind, error) {
change := sqlx.CommentChange(from.Attrs, to.Attrs)
if from.Type.Null != to.Type.Null {
change |= schema.ChangeNull
}
changed, err := d.typeChanged(from, to)
if err != nil {
return schema.NoChange, err
}
if changed {
change |= schema.ChangeType
}
if changed := d.defaultChanged(from, to); changed {
change |= schema.ChangeDefault
}
if d.generatedChanged(from, to) {
change |= schema.ChangeGenerated
}
return change, nil
}
// typeChanged reports if the column type was changed.
func (d *diff) typeChanged(from, to *schema.Column) (bool, error) {
fromT, toT := from.Type.Type, to.Type.Type
if fromT == nil || toT == nil {
return false, fmt.Errorf("sqlite: missing type information for column %q", from.Name)
}
// Types are mismatched if they do not have the same "type affinity".
return reflect.TypeOf(fromT) != reflect.TypeOf(toT), nil
}
// defaultChanged reports if the default value of a column was changed.
func (d *diff) defaultChanged(from, to *schema.Column) bool {
d1, ok1 := sqlx.DefaultValue(from)
d2, ok2 := sqlx.DefaultValue(to)
if ok1 != ok2 {
return true
}
if d1 == d2 {
return false
}
x1, err1 := sqlx.Unquote(d1)
x2, err2 := sqlx.Unquote(d2)
return err1 != nil || err2 != nil || x1 != x2
}
// generatedChanged reports if the generated expression of a column was changed.
func (*diff) generatedChanged(from, to *schema.Column) bool {
var (
fromX, toX schema.GeneratedExpr
fromHas, toHas = sqlx.Has(from.Attrs, &fromX), sqlx.Has(to.Attrs, &toX)
)
return fromHas != toHas || fromHas && (sqlx.MayWrap(fromX.Expr) != sqlx.MayWrap(toX.Expr) || storedOrVirtual(fromX.Type) != storedOrVirtual(toX.Type))
}
// IsGeneratedIndexName reports if the index name was generated by the database.
// See: https://github.com/sqlite/sqlite/blob/e937df8/src/build.c#L3583.
func (d *diff) IsGeneratedIndexName(t *schema.Table, idx *schema.Index) bool {
p := fmt.Sprintf("sqlite_autoindex_%s_", t.Name)
if !strings.HasPrefix(idx.Name, p) {
return false
}
i, err := strconv.ParseInt(strings.TrimPrefix(idx.Name, p), 10, 64)
return err == nil && i > 0
}
// IndexAttrChanged reports if the index attributes were changed.
func (*diff) IndexAttrChanged(from, to []schema.Attr) bool {
var p1, p2 IndexPredicate
return sqlx.Has(from, &p1) != sqlx.Has(to, &p2) || (p1.P != p2.P && p1.P != sqlx.MayWrap(p2.P))
}
// IndexPartAttrChanged reports if the index-part attributes were changed.
func (*diff) IndexPartAttrChanged(_, _ *schema.IndexPart) bool {
return false
}
// ReferenceChanged reports if the foreign key referential action was changed.
func (*diff) ReferenceChanged(from, to schema.ReferenceOption) bool {
// According to SQLite, if an action is not explicitly
// specified, it defaults to "NO ACTION".
if from == "" {
from = schema.NoAction
}
if to == "" {
to = schema.NoAction
}
return from != to
}
// Normalize implements the sqlx.Normalizer interface.
func (d *diff) Normalize(from, to *schema.Table) {
used := make([]bool, len(to.ForeignKeys))
// In SQLite, there is no easy way to get the foreign-key constraint
// name, except for parsing the CREATE statement). Therefore, we check
// if there is a foreign-key with identical properties.
for _, fk1 := range from.ForeignKeys {
for i, fk2 := range to.ForeignKeys {
if used[i] {
continue
}
if fk2.Symbol == fk1.Symbol && !isNumber(fk1.Symbol) || sameFK(fk1, fk2) {
fk1.Symbol = fk2.Symbol
used[i] = true
}
}
}
}
func sameFK(fk1, fk2 *schema.ForeignKey) bool {
if fk1.Table.Name != fk2.Table.Name || fk1.RefTable.Name != fk2.RefTable.Name ||
len(fk1.Columns) != len(fk2.Columns) || len(fk1.RefColumns) != len(fk2.RefColumns) {
return false
}
for i, c1 := range fk1.Columns {
if c1.Name != fk2.Columns[i].Name {
return false
}
}
for i, c1 := range fk1.RefColumns {
if c1.Name != fk2.RefColumns[i].Name {
return false
}
}
return true
}