-
-
Notifications
You must be signed in to change notification settings - Fork 36
/
crud.go
183 lines (148 loc) · 3.68 KB
/
crud.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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
package file
import (
"fmt"
page "github.com/shortlink-org/shortlink/boundaries/shortdb/shortdb/domain/page/v1"
v1 "github.com/shortlink-org/shortlink/boundaries/shortdb/shortdb/domain/query/v1"
"github.com/shortlink-org/shortlink/boundaries/shortdb/shortdb/engine/file/cursor"
)
func (f *File) Select(query *v1.Query) ([]*page.Row, error) {
f.mu.RLock()
defer f.mu.RUnlock()
// check table
t := f.database.GetTables()[query.GetTableName()]
if t == nil {
return nil, &NotExistTableError{
Table: query.GetTableName(),
Type: "SELECT",
}
}
if len(query.GetFields()) == 0 {
return nil, ErrIncorrectNameFields
}
// response
response := make([]*page.Row, 0)
currentRow, err := cursor.New(t, false)
if err != nil {
return nil, ErrCreateCursor
}
for !currentRow.EndOfTable {
// load data
if t.GetPages()[currentRow.PageId] == nil {
pagePath := fmt.Sprintf("%s/%s_%s_%d.page", f.path, f.database.GetName(), t.GetName(), currentRow.PageId)
payload, errLoadPage := f.loadPage(pagePath)
if errLoadPage != nil {
return nil, errLoadPage
}
if t.GetPages() == nil {
t.Pages = make(map[int32]*page.Page, 0)
}
t.Pages[currentRow.PageId] = payload
}
// get value
record, errGetValue := currentRow.Value()
if errGetValue != nil {
return nil, errGetValue
}
for _, field := range query.GetFields() {
if record.GetValue()[field] == nil {
return nil, &IncorrectNameFieldsError{
Field: field,
Table: query.GetTableName(),
}
}
}
if query.IsFilter(record, t.GetFields()) {
response = append(response, record)
if query.IsLimit() {
query.Limit--
}
}
if !query.IsLimit() {
break
}
currentRow.Advance()
}
return response, nil
}
func (f *File) Update(query *v1.Query) error {
// TODO implement me
return nil
}
func (f *File) Insert(query *v1.Query) error {
err := f.insertToTable(query)
if err != nil {
return err
}
err = f.insertToIndex(query)
if err != nil {
return err
}
return nil
}
func (f *File) insertToTable(query *v1.Query) error {
f.mu.Lock()
defer f.mu.Unlock()
// check the table's existence
t := f.database.GetTables()[query.GetTableName()]
if t == nil {
return &NotExistTableError{
Table: query.GetTableName(),
Type: "INSERT",
}
}
// check if a new page needs to be created
_, err := f.addPage(query.GetTableName())
if err != nil {
return ErrCreatePage
}
if t.GetStats().GetPageCount() > -1 && t.GetPages()[t.GetStats().GetPageCount()] == nil {
// load page
pagePath := fmt.Sprintf("%s/%s_%s_%d.page", f.path, f.database.GetName(), t.GetName(), t.GetStats().GetPageCount())
payload, errLoadPage := f.loadPage(pagePath)
if errLoadPage != nil {
return errLoadPage
}
if t.GetPages() == nil {
t.Pages = make(map[int32]*page.Page, 0)
}
t.Pages[t.GetStats().GetPageCount()] = payload
}
// insert to last page
currentRow, err := cursor.New(t, true)
if err != nil {
return &CreateCursorError{
Type: "INSERT",
}
}
row, err := currentRow.Value()
if err != nil {
return ErrCreateCursor
}
// check values and create row record
record := page.Row{
Value: make(map[string][]byte),
}
for index, field := range query.GetFields() {
if t.GetFields()[field].String() == "" {
return &IncorrectTypeFieldsError{
Field: field,
Table: query.GetTableName(),
}
}
record.Value[field] = []byte(query.GetInserts()[0].GetItems()[index])
}
row.Value = record.GetValue()
// update stats
t.Stats.RowsCount += 1
// iterator to next value
currentRow.Advance()
return nil
}
func (f *File) insertToIndex(query *v1.Query) error {
// TODO implement me
return nil
}
func (f *File) Delete(query *v1.Query) error {
// TODO implement me
return nil
}