forked from umisama/go-sqlbuilder
-
Notifications
You must be signed in to change notification settings - Fork 2
/
table.go
416 lines (363 loc) · 8.15 KB
/
table.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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
package sqlbuilder
type joinType int
const (
inner_join joinType = iota
left_outer_join
right_outer_join
full_outer_join
)
type table struct {
name string
option *TableOption
columns []Column
}
// TableOption reprecents constraint of a table.
type TableOption struct {
Unique [][]string
//ForeignKey map[string]Column // will implement future
}
type joinTable struct {
typ joinType
left Table
right Table
on Condition
}
// Table represents a table.
type Table interface {
serializable
// C returns table's column by the name.
C(name string) Column
// Name returns table' name.
// returns empty if it is joined table or subquery.
Name() string
// Option returns table's option(table constraint).
// returns nil if it is joined table or subquery.
Option() *TableOption
// Columns returns all columns.
Columns() []Column
// InnerJoin returns a joined table use with "INNER JOIN" clause.
// The joined table can be handled in same way as single table.
InnerJoin(Table, Condition) Table
// LeftOuterJoin returns a joined table use with "LEFT OUTER JOIN" clause.
// The joined table can be handled in same way as single table.
LeftOuterJoin(Table, Condition) Table
// RightOuterJoin returns a joined table use with "RIGHT OUTER JOIN" clause.
// The joined table can be handled in same way as single table.
RightOuterJoin(Table, Condition) Table
// FullOuterJoin returns a joined table use with "FULL OUTER JOIN" clause.
// The joined table can be handled in same way as single table.
FullOuterJoin(Table, Condition) Table
hasColumn(column Column) bool
}
// NewTable returns a new table named by the name. Specify table columns by the column_config.
// Panic if column is empty.
func NewTable(name string, option *TableOption, column_configs ...ColumnConfig) Table {
if len(column_configs) == 0 {
panic(newError("column is needed."))
}
if option == nil {
option = &TableOption{}
}
t := &table{
name: name,
option: option,
columns: make([]Column, 0, len(column_configs)),
}
for _, column_config := range column_configs {
err := t.AddColumnLast(column_config)
if err != nil {
panic(err)
}
}
return t
}
func (m *table) serialize(bldr *builder) {
bldr.Append(dialect().QuoteField(m.name))
return
}
func (m *table) C(name string) Column {
for _, column := range m.columns {
if column.column_name() == name {
return column
}
}
return newErrorColumn(newError("column %s.%s was not found.", m.name, name))
}
func (m *table) Name() string {
return m.name
}
func (m *table) SetName(name string) {
m.name = name
}
func (m *table) Columns() []Column {
return m.columns
}
func (m *table) Option() *TableOption {
return m.option
}
func (m *table) AddColumnLast(cc ColumnConfig) error {
return m.addColumn(cc, len(m.columns))
}
func (m *table) AddColumnFirst(cc ColumnConfig) error {
return m.addColumn(cc, 0)
}
func (m *table) AddColumnAfter(cc ColumnConfig, after Column) error {
for i := range m.columns {
if m.columns[i] == after {
return m.addColumn(cc, i+1)
}
}
return newError("column not found.")
}
func (m *table) ChangeColumn(trg Column, cc ColumnConfig) error {
for i := range m.columns {
if m.columns[i] == trg {
err := m.dropColumn(i)
if err != nil {
return err
}
err = m.addColumn(cc, i)
if err != nil {
return err
}
return nil
}
}
return newError("column not found.")
}
func (m *table) ChangeColumnFirst(trg Column, cc ColumnConfig) error {
for i := range m.columns {
if m.columns[i] == trg {
err := m.dropColumn(i)
if err != nil {
return err
}
err = m.addColumn(cc, 0)
if err != nil {
return err
}
return nil
}
}
return newError("column not found.")
}
func (m *table) ChangeColumnAfter(trg Column, cc ColumnConfig, after Column) error {
backup := make([]Column, len(m.columns))
copy(backup, m.columns)
found := false
for i := range m.columns {
if m.columns[i] == trg {
err := m.dropColumn(i)
if err != nil {
m.columns = backup
return err
}
found = true
break
}
}
if !found {
return newError("column not found.")
}
for i := range m.columns {
if m.columns[i] == after {
err := m.addColumn(cc, i+1)
if err != nil {
m.columns = backup
return err
}
return nil
}
}
m.columns = backup
return newError("column not found.")
}
func (m *table) addColumn(cc ColumnConfig, pos int) error {
if len(m.columns) < pos || pos < 0 {
return newError("Invalid position.")
}
var (
u = make([]Column, pos)
p = make([]Column, len(m.columns)-pos)
)
copy(u, m.columns[:pos])
copy(p, m.columns[pos:])
c := cc.toColumn(m)
m.columns = append(u, c)
m.columns = append(m.columns, p...)
return nil
}
func (m *table) DropColumn(col Column) error {
for i := range m.columns {
if m.columns[i] == col {
return m.dropColumn(i)
}
}
return newError("column not found.")
}
func (m *table) dropColumn(pos int) error {
if len(m.columns) < pos || pos < 0 {
return newError("Invalid position.")
}
var (
u = make([]Column, pos)
p = make([]Column, len(m.columns)-pos-1)
)
copy(u, m.columns[:pos])
if len(m.columns) > pos+1 {
copy(p, m.columns[pos+1:])
}
m.columns = append(u, p...)
return nil
}
func (m *table) InnerJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: inner_join,
on: on,
}
}
func (m *table) LeftOuterJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: left_outer_join,
on: on,
}
}
func (m *table) RightOuterJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: right_outer_join,
on: on,
}
}
func (m *table) FullOuterJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: full_outer_join,
on: on,
}
}
func (m *table) hasColumn(trg Column) bool {
if cimpl, ok := trg.(*columnImpl); ok {
if trg == Star {
return true
}
for _, col := range m.columns {
if col == cimpl {
return true
}
}
return false
}
if acol, ok := trg.(*aliasColumn); ok {
for _, col := range m.columns {
if col == acol.column {
return true
}
}
return false
}
if sqlfn, ok := trg.(*sqlFuncImpl); ok {
for _, fncol := range sqlfn.columns() {
find := false
for _, col := range m.columns {
if col == fncol {
find = true
}
}
if !find {
return false
}
}
return true
}
return false
}
func (m *joinTable) C(name string) Column {
l_col := m.left.C(name)
r_col := m.right.C(name)
_, l_err := l_col.(*errorColumn)
_, r_err := r_col.(*errorColumn)
switch {
case l_err && r_err:
return newErrorColumn(newError("column %s was not found.", name))
case l_err && !r_err:
return r_col
case !l_err && r_err:
return l_col
default:
return newErrorColumn(newError("column %s was duplicated.", name))
}
}
func (m *joinTable) Name() string {
return ""
}
func (m *joinTable) Columns() []Column {
return append(m.left.Columns(), m.right.Columns()...)
}
func (m *joinTable) Option() *TableOption {
return nil
}
func (m *joinTable) InnerJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: inner_join,
on: on,
}
}
func (m *joinTable) LeftOuterJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: left_outer_join,
on: on,
}
}
func (m *joinTable) RightOuterJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: right_outer_join,
on: on,
}
}
func (m *joinTable) FullOuterJoin(right Table, on Condition) Table {
return &joinTable{
left: m,
right: right,
typ: full_outer_join,
on: on,
}
}
func (m *joinTable) serialize(bldr *builder) {
bldr.AppendItem(m.left)
switch m.typ {
case inner_join:
bldr.Append(" INNER JOIN ")
case left_outer_join:
bldr.Append(" LEFT OUTER JOIN ")
case right_outer_join:
bldr.Append(" RIGHT OUTER JOIN ")
case full_outer_join:
bldr.Append(" FULL OUTER JOIN ")
}
bldr.AppendItem(m.right)
bldr.Append(" ON ")
bldr.AppendItem(m.on)
return
}
func (m *joinTable) hasColumn(trg Column) bool {
if m.left.hasColumn(trg) {
return true
}
if m.right.hasColumn(trg) {
return true
}
return false
}