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
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
|
require 'bigdecimal'
require 'date'
module Arel
module Visitors
class ToSql < Arel::Visitors::Visitor
attr_accessor :last_column
def initialize connection
@connection = connection
@schema_cache = connection.schema_cache
@quoted_tables = {}
@quoted_columns = {}
@last_column = nil
end
def accept object
self.last_column = nil
super
end
private
def visit_Arel_Nodes_DeleteStatement o
[
"DELETE FROM #{visit o.relation}",
("WHERE #{o.wheres.map { |x| visit x }.join ' AND '}" unless o.wheres.empty?)
].compact.join ' '
end
# FIXME: we should probably have a 2-pass visitor for this
def build_subselect key, o
stmt = Nodes::SelectStatement.new
core = stmt.cores.first
core.froms = o.relation
core.wheres = o.wheres
core.projections = [key]
stmt.limit = o.limit
stmt.orders = o.orders
stmt
end
def visit_Arel_Nodes_UpdateStatement o
if o.orders.empty? && o.limit.nil?
wheres = o.wheres
else
key = o.key
unless key
warn(<<-eowarn) if $VERBOSE
(#{caller.first}) Using UpdateManager without setting UpdateManager#key is
deprecated and support will be removed in ARel 4.0.0. Please set the primary
key on UpdateManager using UpdateManager#key=
eowarn
key = o.relation.primary_key
end
wheres = [Nodes::In.new(key, [build_subselect(key, o)])]
end
[
"UPDATE #{visit o.relation}",
("SET #{o.values.map { |value| visit value }.join ', '}" unless o.values.empty?),
("WHERE #{wheres.map { |x| visit x }.join ' AND '}" unless wheres.empty?),
].compact.join ' '
end
def visit_Arel_Nodes_InsertStatement o
[
"INSERT INTO #{visit o.relation}",
("(#{o.columns.map { |x|
quote_column_name x.name
}.join ', '})" unless o.columns.empty?),
(visit o.values if o.values),
].compact.join ' '
end
def visit_Arel_Nodes_Exists o
"EXISTS (#{visit o.expressions})#{
o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_True o
"TRUE"
end
def visit_Arel_Nodes_False o
"FALSE"
end
def table_exists? name
@schema_cache.table_exists? name
end
def column_for attr
name = attr.name.to_s
table = attr.relation.table_name
return nil unless table_exists? table
column_cache[table][name]
end
def column_cache
@schema_cache.columns_hash
end
def visit_Arel_Nodes_Values o
"VALUES (#{o.expressions.zip(o.columns).map { |value, attr|
if Nodes::SqlLiteral === value
visit value
else
quote(value, attr && column_for(attr))
end
}.join ', '})"
end
def visit_Arel_Nodes_SelectStatement o
[
(visit(o.with) if o.with),
o.cores.map { |x| visit_Arel_Nodes_SelectCore x }.join,
("ORDER BY #{o.orders.map { |x| visit x }.join(', ')}" unless o.orders.empty?),
(visit(o.limit) if o.limit),
(visit(o.offset) if o.offset),
(visit(o.lock) if o.lock),
].compact.join ' '
end
def visit_Arel_Nodes_SelectCore o
[
"SELECT",
(visit(o.top) if o.top),
(visit(o.set_quantifier) if o.set_quantifier),
("#{o.projections.map { |x| visit x }.join ', '}" unless o.projections.empty?),
("FROM #{visit(o.source)}" if o.source && !o.source.empty?),
("WHERE #{o.wheres.map { |x| visit x }.join ' AND ' }" unless o.wheres.empty?),
("GROUP BY #{o.groups.map { |x| visit x }.join ', ' }" unless o.groups.empty?),
(visit(o.having) if o.having),
("WINDOW #{o.windows.map { |x| visit x }.join ', ' }" unless o.windows.empty?)
].compact.join ' '
end
def visit_Arel_Nodes_Bin o
visit o.expr
end
def visit_Arel_Nodes_Distinct o
'DISTINCT'
end
def visit_Arel_Nodes_DistinctOn o
raise NotImplementedError, 'DISTINCT ON not implemented for this db'
end
def visit_Arel_Nodes_With o
"WITH #{o.children.map { |x| visit x }.join(', ')}"
end
def visit_Arel_Nodes_WithRecursive o
"WITH RECURSIVE #{o.children.map { |x| visit x }.join(', ')}"
end
def visit_Arel_Nodes_Union o
"( #{visit o.left} UNION #{visit o.right} )"
end
def visit_Arel_Nodes_UnionAll o
"( #{visit o.left} UNION ALL #{visit o.right} )"
end
def visit_Arel_Nodes_Intersect o
"( #{visit o.left} INTERSECT #{visit o.right} )"
end
def visit_Arel_Nodes_Except o
"( #{visit o.left} EXCEPT #{visit o.right} )"
end
def visit_Arel_Nodes_NamedWindow o
"#{quote_column_name o.name} AS #{visit_Arel_Nodes_Window o}"
end
def visit_Arel_Nodes_Window o
s = [
("ORDER BY #{o.orders.map { |x| visit(x) }.join(', ')}" unless o.orders.empty?),
(visit o.framing if o.framing)
].compact.join ' '
"(#{s})"
end
def visit_Arel_Nodes_Rows o
if o.expr
"ROWS #{visit o.expr}"
else
"ROWS"
end
end
def visit_Arel_Nodes_Range o
if o.expr
"RANGE #{visit o.expr}"
else
"RANGE"
end
end
def visit_Arel_Nodes_Preceding o
"#{o.expr ? visit(o.expr) : 'UNBOUNDED'} PRECEDING"
end
def visit_Arel_Nodes_Following o
"#{o.expr ? visit(o.expr) : 'UNBOUNDED'} FOLLOWING"
end
def visit_Arel_Nodes_CurrentRow o
"CURRENT ROW"
end
def visit_Arel_Nodes_Over o
case o.right
when nil
"#{visit o.left} OVER ()"
when Arel::Nodes::SqlLiteral
"#{visit o.left} OVER #{visit o.right}"
when String, Symbol
"#{visit o.left} OVER #{quote_column_name o.right.to_s}"
else
"#{visit o.left} OVER #{visit o.right}"
end
end
def visit_Arel_Nodes_Having o
"HAVING #{visit o.expr}"
end
def visit_Arel_Nodes_Offset o
"OFFSET #{visit o.expr}"
end
def visit_Arel_Nodes_Limit o
"LIMIT #{visit o.expr}"
end
# FIXME: this does nothing on most databases, but does on MSSQL
def visit_Arel_Nodes_Top o
""
end
def visit_Arel_Nodes_Lock o
visit o.expr
end
def visit_Arel_Nodes_Grouping o
"(#{visit o.expr})"
end
def visit_Arel_SelectManager o
"(#{o.to_sql.rstrip})"
end
def visit_Arel_Nodes_Ascending o
"#{visit o.expr} ASC"
end
def visit_Arel_Nodes_Descending o
"#{visit o.expr} DESC"
end
def visit_Arel_Nodes_Group o
visit o.expr
end
def visit_Arel_Nodes_NamedFunction o
"#{o.name}(#{o.distinct ? 'DISTINCT ' : ''}#{o.expressions.map { |x|
visit x
}.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_Extract o
"EXTRACT(#{o.field.to_s.upcase} FROM #{visit o.expr})#{o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_Count o
"COUNT(#{o.distinct ? 'DISTINCT ' : ''}#{o.expressions.map { |x|
visit x
}.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_Sum o
"SUM(#{o.expressions.map { |x|
visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_Max o
"MAX(#{o.expressions.map { |x|
visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_Min o
"MIN(#{o.expressions.map { |x|
visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_Avg o
"AVG(#{o.expressions.map { |x|
visit x }.join(', ')})#{o.alias ? " AS #{visit o.alias}" : ''}"
end
def visit_Arel_Nodes_TableAlias o
"#{visit o.relation} #{quote_table_name o.name}"
end
def visit_Arel_Nodes_Between o
"#{visit o.left} BETWEEN #{visit o.right}"
end
def visit_Arel_Nodes_GreaterThanOrEqual o
"#{visit o.left} >= #{visit o.right}"
end
def visit_Arel_Nodes_GreaterThan o
"#{visit o.left} > #{visit o.right}"
end
def visit_Arel_Nodes_LessThanOrEqual o
"#{visit o.left} <= #{visit o.right}"
end
def visit_Arel_Nodes_LessThan o
"#{visit o.left} < #{visit o.right}"
end
def visit_Arel_Nodes_Matches o
"#{visit o.left} LIKE #{visit o.right}"
end
def visit_Arel_Nodes_DoesNotMatch o
"#{visit o.left} NOT LIKE #{visit o.right}"
end
def visit_Arel_Nodes_JoinSource o
[
(visit(o.left) if o.left),
o.right.map { |j| visit j }.join(' ')
].compact.join ' '
end
def visit_Arel_Nodes_StringJoin o
visit o.left
end
def visit_Arel_Nodes_OuterJoin o
"LEFT OUTER JOIN #{visit o.left} #{visit o.right}"
end
def visit_Arel_Nodes_InnerJoin o
"INNER JOIN #{visit o.left} #{visit o.right if o.right}"
end
def visit_Arel_Nodes_On o
"ON #{visit o.expr}"
end
def visit_Arel_Nodes_Not o
"NOT (#{visit o.expr})"
end
def visit_Arel_Table o
if o.table_alias
"#{quote_table_name o.name} #{quote_table_name o.table_alias}"
else
quote_table_name o.name
end
end
def visit_Arel_Nodes_In o
if Array === o.right && o.right.empty?
'1=0'
else
"#{visit o.left} IN (#{visit o.right})"
end
end
def visit_Arel_Nodes_NotIn o
if Array === o.right && o.right.empty?
'1=1'
else
"#{visit o.left} NOT IN (#{visit o.right})"
end
end
def visit_Arel_Nodes_And o
o.children.map { |x| visit x }.join ' AND '
end
def visit_Arel_Nodes_Or o
"#{visit o.left} OR #{visit o.right}"
end
def visit_Arel_Nodes_Assignment o
right = quote(o.right, column_for(o.left))
"#{visit o.left} = #{right}"
end
def visit_Arel_Nodes_Equality o
right = o.right
if right.nil?
"#{visit o.left} IS NULL"
else
"#{visit o.left} = #{visit right}"
end
end
def visit_Arel_Nodes_NotEqual o
right = o.right
if right.nil?
"#{visit o.left} IS NOT NULL"
else
"#{visit o.left} != #{visit right}"
end
end
def visit_Arel_Nodes_As o
"#{visit o.left} AS #{visit o.right}"
end
def visit_Arel_Nodes_UnqualifiedColumn o
"#{quote_column_name o.name}"
end
def visit_Arel_Attributes_Attribute o
self.last_column = column_for o
join_name = o.relation.table_alias || o.relation.name
"#{quote_table_name join_name}.#{quote_column_name o.name}"
end
alias :visit_Arel_Attributes_Integer :visit_Arel_Attributes_Attribute
alias :visit_Arel_Attributes_Float :visit_Arel_Attributes_Attribute
alias :visit_Arel_Attributes_Decimal :visit_Arel_Attributes_Attribute
alias :visit_Arel_Attributes_String :visit_Arel_Attributes_Attribute
alias :visit_Arel_Attributes_Time :visit_Arel_Attributes_Attribute
alias :visit_Arel_Attributes_Boolean :visit_Arel_Attributes_Attribute
def literal o; o end
alias :visit_Arel_Nodes_BindParam :literal
alias :visit_Arel_Nodes_SqlLiteral :literal
alias :visit_Arel_SqlLiteral :literal # This is deprecated
alias :visit_Bignum :literal
alias :visit_Fixnum :literal
def quoted o
quote(o, last_column)
end
alias :visit_ActiveSupport_Multibyte_Chars :quoted
alias :visit_ActiveSupport_StringInquirer :quoted
alias :visit_BigDecimal :quoted
alias :visit_Class :quoted
alias :visit_Date :quoted
alias :visit_DateTime :quoted
alias :visit_FalseClass :quoted
alias :visit_Float :quoted
alias :visit_Hash :quoted
alias :visit_NilClass :quoted
alias :visit_String :quoted
alias :visit_Symbol :quoted
alias :visit_Time :quoted
alias :visit_TrueClass :quoted
def visit_Arel_Nodes_InfixOperation o
"#{visit o.left} #{o.operator} #{visit o.right}"
end
alias :visit_Arel_Nodes_Addition :visit_Arel_Nodes_InfixOperation
alias :visit_Arel_Nodes_Subtraction :visit_Arel_Nodes_InfixOperation
alias :visit_Arel_Nodes_Multiplication :visit_Arel_Nodes_InfixOperation
alias :visit_Arel_Nodes_Division :visit_Arel_Nodes_InfixOperation
def visit_Array o
o.map { |x| visit x }.join(', ')
end
def quote value, column = nil
@connection.quote value, column
end
def quote_table_name name
return name if Arel::Nodes::SqlLiteral === name
@quoted_tables[name] ||= @connection.quote_table_name(name)
end
def quote_column_name name
@quoted_columns[name] ||= Arel::Nodes::SqlLiteral === name ? name : @connection.quote_column_name(name)
end
end
end
end
|