/
sql.go
414 lines (367 loc) · 11.5 KB
/
sql.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
// Copyright 2019-present Facebook Inc. 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 sql
import (
"fmt"
"strings"
"entgo.io/ent/dialect"
)
// The following helpers exist to simplify the way raw predicates
// are defined and used in both ent/schema and generated code. For
// full predicates API, check out the sql.P in builder.go.
// FieldIsNull returns a raw predicate to check if the given field is NULL.
func FieldIsNull(name string) func(*Selector) {
return func(s *Selector) {
s.Where(IsNull(s.C(name)))
}
}
// FieldNotNull returns a raw predicate to check if the given field is not NULL.
func FieldNotNull(name string) func(*Selector) {
return func(s *Selector) {
s.Where(NotNull(s.C(name)))
}
}
// FieldEQ returns a raw predicate to check if the given field equals to the given value.
func FieldEQ(name string, v any) func(*Selector) {
return func(s *Selector) {
s.Where(EQ(s.C(name), v))
}
}
// FieldsEQ returns a raw predicate to check if the given fields (columns) are equal.
func FieldsEQ(field1, field2 string) func(*Selector) {
return func(s *Selector) {
s.Where(ColumnsEQ(s.C(field1), s.C(field2)))
}
}
// FieldNEQ returns a raw predicate to check if the given field does not equal to the given value.
func FieldNEQ(name string, v any) func(*Selector) {
return func(s *Selector) {
s.Where(NEQ(s.C(name), v))
}
}
// FieldsNEQ returns a raw predicate to check if the given fields (columns) are not equal.
func FieldsNEQ(field1, field2 string) func(*Selector) {
return func(s *Selector) {
s.Where(ColumnsNEQ(s.C(field1), s.C(field2)))
}
}
// FieldGT returns a raw predicate to check if the given field is greater than the given value.
func FieldGT(name string, v any) func(*Selector) {
return func(s *Selector) {
s.Where(GT(s.C(name), v))
}
}
// FieldsGT returns a raw predicate to check if field1 is greater than field2.
func FieldsGT(field1, field2 string) func(*Selector) {
return func(s *Selector) {
s.Where(ColumnsGT(s.C(field1), s.C(field2)))
}
}
// FieldGTE returns a raw predicate to check if the given field is greater than or equal the given value.
func FieldGTE(name string, v any) func(*Selector) {
return func(s *Selector) {
s.Where(GTE(s.C(name), v))
}
}
// FieldsGTE returns a raw predicate to check if field1 is greater than or equal field2.
func FieldsGTE(field1, field2 string) func(*Selector) {
return func(s *Selector) {
s.Where(ColumnsGTE(s.C(field1), s.C(field2)))
}
}
// FieldLT returns a raw predicate to check if the value of the field is less than the given value.
func FieldLT(name string, v any) func(*Selector) {
return func(s *Selector) {
s.Where(LT(s.C(name), v))
}
}
// FieldsLT returns a raw predicate to check if field1 is lower than field2.
func FieldsLT(field1, field2 string) func(*Selector) {
return func(s *Selector) {
s.Where(ColumnsLT(s.C(field1), s.C(field2)))
}
}
// FieldLTE returns a raw predicate to check if the value of the field is less than the given value.
func FieldLTE(name string, v any) func(*Selector) {
return func(s *Selector) {
s.Where(LTE(s.C(name), v))
}
}
// FieldsLTE returns a raw predicate to check if field1 is lower than or equal field2.
func FieldsLTE(field1, field2 string) func(*Selector) {
return func(s *Selector) {
s.Where(ColumnsLTE(s.C(field1), s.C(field2)))
}
}
// FieldsHasPrefix returns a raw predicate to checks if field1 begins with the value of field2.
func FieldsHasPrefix(field1, field2 string) func(*Selector) {
return func(s *Selector) {
s.Where(ColumnsHasPrefix(s.C(field1), s.C(field2)))
}
}
// FieldIn returns a raw predicate to check if the value of the field is IN the given values.
func FieldIn[T any](name string, vs ...T) func(*Selector) {
return func(s *Selector) {
v := make([]any, len(vs))
for i := range v {
v[i] = vs[i]
}
s.Where(In(s.C(name), v...))
}
}
// FieldNotIn returns a raw predicate to check if the value of the field is NOT IN the given values.
func FieldNotIn[T any](name string, vs ...T) func(*Selector) {
return func(s *Selector) {
v := make([]any, len(vs))
for i := range v {
v[i] = vs[i]
}
s.Where(NotIn(s.C(name), v...))
}
}
// FieldEqualFold returns a raw predicate to check if the field has the given prefix with case-folding.
func FieldEqualFold(name string, substr string) func(*Selector) {
return func(s *Selector) {
s.Where(EqualFold(s.C(name), substr))
}
}
// FieldHasPrefix returns a raw predicate to check if the field has the given prefix.
func FieldHasPrefix(name string, prefix string) func(*Selector) {
return func(s *Selector) {
s.Where(HasPrefix(s.C(name), prefix))
}
}
// FieldHasSuffix returns a raw predicate to check if the field has the given suffix.
func FieldHasSuffix(name string, suffix string) func(*Selector) {
return func(s *Selector) {
s.Where(HasSuffix(s.C(name), suffix))
}
}
// FieldContains returns a raw predicate to check if the field contains the given substring.
func FieldContains(name string, substr string) func(*Selector) {
return func(s *Selector) {
s.Where(Contains(s.C(name), substr))
}
}
// FieldContainsFold returns a raw predicate to check if the field contains the given substring with case-folding.
func FieldContainsFold(name string, substr string) func(*Selector) {
return func(s *Selector) {
s.Where(ContainsFold(s.C(name), substr))
}
}
// AndPredicates returns a new predicate for joining multiple generated predicates with AND between them.
func AndPredicates[P ~func(*Selector)](predicates ...P) func(*Selector) {
return func(s *Selector) {
s.CollectPredicates()
for _, p := range predicates {
p(s)
}
collected := s.CollectedPredicates()
s.UncollectedPredicates()
switch len(collected) {
case 0:
case 1:
s.Where(collected[0])
default:
s.Where(And(collected...))
}
}
}
// OrPredicates returns a new predicate for joining multiple generated predicates with OR between them.
func OrPredicates[P ~func(*Selector)](predicates ...P) func(*Selector) {
return func(s *Selector) {
s.CollectPredicates()
for _, p := range predicates {
p(s)
}
collected := s.CollectedPredicates()
s.UncollectedPredicates()
switch len(collected) {
case 0:
case 1:
s.Where(collected[0])
default:
s.Where(Or(collected...))
}
}
}
// NotPredicates wraps the generated predicates with NOT. For example, NOT(P), NOT((P1 AND P2)).
func NotPredicates[P ~func(*Selector)](predicates ...P) func(*Selector) {
return func(s *Selector) {
s.CollectPredicates()
for _, p := range predicates {
p(s)
}
collected := s.CollectedPredicates()
s.UncollectedPredicates()
switch len(collected) {
case 0:
case 1:
s.Where(Not(collected[0]))
default:
s.Where(Not(And(collected...)))
}
}
}
// ColumnCheck is a function that verifies whether the
// specified column exists within the given table.
type ColumnCheck func(table, column string) error
// NewColumnCheck returns a function that verifies whether the specified column exists
// within the given table. This function is utilized by the generated code to validate
// column names in ordering functions.
func NewColumnCheck(checks map[string]func(string) bool) ColumnCheck {
return func(table, column string) error {
check, ok := checks[table]
if !ok {
return fmt.Errorf("unknown table %q", table)
}
if !check(column) {
return fmt.Errorf("unknown column %q for table %q", column, table)
}
return nil
}
}
type (
// OrderFieldTerm represents an ordering by a field.
OrderFieldTerm struct {
OrderTermOptions
Field string // Field name.
}
// OrderExprTerm represents an ordering by an expression.
OrderExprTerm struct {
OrderTermOptions
Expr func(*Selector) Querier // Expression.
}
// OrderTerm represents an ordering by a term.
OrderTerm interface {
term()
}
// OrderTermOptions represents options for ordering by a term.
OrderTermOptions struct {
Desc bool // Whether to sort in descending order.
As string // Optional alias.
Selected bool // Whether the term should be selected.
NullsFirst bool // Whether to sort nulls first.
NullsLast bool // Whether to sort nulls last.
}
// OrderTermOption is an option for ordering by a term.
OrderTermOption func(*OrderTermOptions)
)
// OrderDesc returns an option to sort in descending order.
func OrderDesc() OrderTermOption {
return func(o *OrderTermOptions) {
o.Desc = true
}
}
// OrderAsc returns an option to sort in ascending order.
func OrderAsc() OrderTermOption {
return func(o *OrderTermOptions) {
o.Desc = false
}
}
// OrderAs returns an option to set the alias for the ordering.
func OrderAs(as string) OrderTermOption {
return func(o *OrderTermOptions) {
o.As = as
}
}
// OrderSelected returns an option to select the ordering term.
func OrderSelected() OrderTermOption {
return func(o *OrderTermOptions) {
o.Selected = true
}
}
// OrderSelectAs returns an option to set and select the alias for the ordering.
func OrderSelectAs(as string) OrderTermOption {
return func(o *OrderTermOptions) {
o.As = as
o.Selected = true
}
}
// OrderNullsFirst returns an option to sort nulls first.
func OrderNullsFirst() OrderTermOption {
return func(o *OrderTermOptions) {
o.NullsFirst = true
}
}
// OrderNullsLast returns an option to sort nulls last.
func OrderNullsLast() OrderTermOption {
return func(o *OrderTermOptions) {
o.NullsLast = true
}
}
// NewOrderTermOptions returns a new OrderTermOptions from the given options.
func NewOrderTermOptions(opts ...OrderTermOption) *OrderTermOptions {
o := &OrderTermOptions{}
for _, opt := range opts {
opt(o)
}
return o
}
// OrderByField returns an ordering by the given field.
func OrderByField(field string, opts ...OrderTermOption) *OrderFieldTerm {
return &OrderFieldTerm{Field: field, OrderTermOptions: *NewOrderTermOptions(opts...)}
}
// OrderBySum returns an ordering by the sum of the given field.
func OrderBySum(field string, opts ...OrderTermOption) *OrderExprTerm {
return orderByAgg("SUM", field, opts...)
}
// OrderByCount returns an ordering by the count of the given field.
func OrderByCount(field string, opts ...OrderTermOption) *OrderExprTerm {
return orderByAgg("COUNT", field, opts...)
}
// orderByAgg returns an ordering by the aggregation of the given field.
func orderByAgg(fn, field string, opts ...OrderTermOption) *OrderExprTerm {
return &OrderExprTerm{
OrderTermOptions: *NewOrderTermOptions(
append(
// Default alias is "<func>_<field>".
[]OrderTermOption{OrderAs(fmt.Sprintf("%s_%s", strings.ToLower(fn), field))},
opts...,
)...,
),
Expr: func(s *Selector) Querier {
var c string
switch {
case field == "*", isFunc(field):
c = field
default:
c = s.C(field)
}
return Raw(fmt.Sprintf("%s(%s)", fn, c))
},
}
}
// OrderByRand returns a term to natively order by a random value.
func OrderByRand() func(*Selector) {
return func(s *Selector) {
s.OrderExprFunc(func(b *Builder) {
switch s.Dialect() {
case dialect.MySQL:
b.WriteString("RAND()")
default:
b.WriteString("RANDOM()")
}
})
}
}
// ToFunc returns a function that sets the ordering on the given selector.
// This is used by the generated code.
func (f *OrderFieldTerm) ToFunc() func(*Selector) {
return func(s *Selector) {
s.OrderExprFunc(func(b *Builder) {
b.WriteString(s.C(f.Field))
if f.Desc {
b.WriteString(" DESC")
}
if f.NullsFirst {
b.WriteString(" NULLS FIRST")
} else if f.NullsLast {
b.WriteString(" NULLS LAST")
}
})
}
}
func (OrderFieldTerm) term() {}
func (OrderExprTerm) term() {}