File: sqlite3_adapter.rb

package info (click to toggle)
rails 2:6.0.3.5+dfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 69,996 kB
  • sloc: ruby: 270,788; javascript: 18,996; yacc: 46; sql: 43; makefile: 28; sh: 18
file content (561 lines) | stat: -rw-r--r-- 19,474 bytes parent folder | download | duplicates (2)
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
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
# frozen_string_literal: true

require "active_record/connection_adapters/abstract_adapter"
require "active_record/connection_adapters/statement_pool"
require "active_record/connection_adapters/sqlite3/explain_pretty_printer"
require "active_record/connection_adapters/sqlite3/quoting"
require "active_record/connection_adapters/sqlite3/database_statements"
require "active_record/connection_adapters/sqlite3/schema_creation"
require "active_record/connection_adapters/sqlite3/schema_definitions"
require "active_record/connection_adapters/sqlite3/schema_dumper"
require "active_record/connection_adapters/sqlite3/schema_statements"

require "sqlite3"

module ActiveRecord
  module ConnectionHandling # :nodoc:
    def sqlite3_connection(config)
      config = config.symbolize_keys

      # Require database.
      unless config[:database]
        raise ArgumentError, "No database file specified. Missing argument: database"
      end

      # Allow database path relative to Rails.root, but only if the database
      # path is not the special path that tells sqlite to build a database only
      # in memory.
      if ":memory:" != config[:database]
        config[:database] = File.expand_path(config[:database], Rails.root) if defined?(Rails.root)
        dirname = File.dirname(config[:database])
        Dir.mkdir(dirname) unless File.directory?(dirname)
      end

      db = SQLite3::Database.new(
        config[:database].to_s,
        config.merge(results_as_hash: true)
      )

      ConnectionAdapters::SQLite3Adapter.new(db, logger, nil, config)
    rescue Errno::ENOENT => error
      if error.message.include?("No such file or directory")
        raise ActiveRecord::NoDatabaseError
      else
        raise
      end
    end
  end

  module ConnectionAdapters #:nodoc:
    # The SQLite3 adapter works SQLite 3.6.16 or newer
    # with the sqlite3-ruby drivers (available as gem from https://rubygems.org/gems/sqlite3).
    #
    # Options:
    #
    # * <tt>:database</tt> - Path to the database file.
    class SQLite3Adapter < AbstractAdapter
      ADAPTER_NAME = "SQLite"

      include SQLite3::Quoting
      include SQLite3::SchemaStatements
      include SQLite3::DatabaseStatements

      NATIVE_DATABASE_TYPES = {
        primary_key:  "integer PRIMARY KEY AUTOINCREMENT NOT NULL",
        string:       { name: "varchar" },
        text:         { name: "text" },
        integer:      { name: "integer" },
        float:        { name: "float" },
        decimal:      { name: "decimal" },
        datetime:     { name: "datetime" },
        time:         { name: "time" },
        date:         { name: "date" },
        binary:       { name: "blob" },
        boolean:      { name: "boolean" },
        json:         { name: "json" },
      }

      def self.represent_boolean_as_integer=(value) # :nodoc:
        if value == false
          raise "`.represent_boolean_as_integer=` is now always true, so make sure your application can work with it and remove this settings."
        end

        ActiveSupport::Deprecation.warn(
          "`.represent_boolean_as_integer=` is now always true, so setting this is deprecated and will be removed in Rails 6.1."
        )
      end

      class StatementPool < ConnectionAdapters::StatementPool # :nodoc:
        private
          def dealloc(stmt)
            stmt.close unless stmt.closed?
          end
      end

      def initialize(connection, logger, connection_options, config)
        super(connection, logger, config)
        configure_connection
      end

      def self.database_exists?(config)
        config = config.symbolize_keys
        if config[:database] == ":memory:"
          true
        else
          database_file = defined?(Rails.root) ? File.expand_path(config[:database], Rails.root) : config[:database]
          File.exist?(database_file)
        end
      end

      def supports_ddl_transactions?
        true
      end

      def supports_savepoints?
        true
      end

      def supports_partial_index?
        true
      end

      def supports_expression_index?
        database_version >= "3.9.0"
      end

      def requires_reloading?
        true
      end

      def supports_foreign_keys?
        true
      end

      def supports_views?
        true
      end

      def supports_datetime_with_precision?
        true
      end

      def supports_json?
        true
      end

      def supports_common_table_expressions?
        database_version >= "3.8.3"
      end

      def supports_insert_on_conflict?
        database_version >= "3.24.0"
      end
      alias supports_insert_on_duplicate_skip? supports_insert_on_conflict?
      alias supports_insert_on_duplicate_update? supports_insert_on_conflict?
      alias supports_insert_conflict_target? supports_insert_on_conflict?

      def active?
        !@connection.closed?
      end

      def reconnect!
        super
        connect if @connection.closed?
      end

      # Disconnects from the database if already connected. Otherwise, this
      # method does nothing.
      def disconnect!
        super
        @connection.close rescue nil
      end

      def supports_index_sort_order?
        true
      end

      # Returns 62. SQLite supports index names up to 64
      # characters. The rest is used by Rails internally to perform
      # temporary rename operations
      def allowed_index_name_length
        index_name_length - 2
      end

      def native_database_types #:nodoc:
        NATIVE_DATABASE_TYPES
      end

      # Returns the current database encoding format as a string, eg: 'UTF-8'
      def encoding
        @connection.encoding.to_s
      end

      def supports_explain?
        true
      end

      def supports_lazy_transactions?
        true
      end

      # REFERENTIAL INTEGRITY ====================================

      def disable_referential_integrity # :nodoc:
        old_foreign_keys = query_value("PRAGMA foreign_keys")
        old_defer_foreign_keys = query_value("PRAGMA defer_foreign_keys")

        begin
          execute("PRAGMA defer_foreign_keys = ON")
          execute("PRAGMA foreign_keys = OFF")
          yield
        ensure
          execute("PRAGMA defer_foreign_keys = #{old_defer_foreign_keys}")
          execute("PRAGMA foreign_keys = #{old_foreign_keys}")
        end
      end

      #--
      # DATABASE STATEMENTS ======================================
      #++
      def explain(arel, binds = [])
        sql = "EXPLAIN QUERY PLAN #{to_sql(arel, binds)}"
        SQLite3::ExplainPrettyPrinter.new.pp(exec_query(sql, "EXPLAIN", []))
      end

      # SCHEMA STATEMENTS ========================================

      def primary_keys(table_name) # :nodoc:
        pks = table_structure(table_name).select { |f| f["pk"] > 0 }
        pks.sort_by { |f| f["pk"] }.map { |f| f["name"] }
      end

      def remove_index(table_name, options = {}) #:nodoc:
        index_name = index_name_for_remove(table_name, options)
        exec_query "DROP INDEX #{quote_column_name(index_name)}"
      end

      # Renames a table.
      #
      # Example:
      #   rename_table('octopuses', 'octopi')
      def rename_table(table_name, new_name)
        exec_query "ALTER TABLE #{quote_table_name(table_name)} RENAME TO #{quote_table_name(new_name)}"
        rename_table_indexes(table_name, new_name)
      end

      def add_column(table_name, column_name, type, **options) #:nodoc:
        if invalid_alter_table_type?(type, options)
          alter_table(table_name) do |definition|
            definition.column(column_name, type, **options)
          end
        else
          super
        end
      end

      def remove_column(table_name, column_name, type = nil, **options) #:nodoc:
        alter_table(table_name) do |definition|
          definition.remove_column column_name
          definition.foreign_keys.delete_if do |_, fk_options|
            fk_options[:column] == column_name.to_s
          end
        end
      end

      def change_column_default(table_name, column_name, default_or_changes) #:nodoc:
        default = extract_new_default_value(default_or_changes)

        alter_table(table_name) do |definition|
          definition[column_name].default = default
        end
      end

      def change_column_null(table_name, column_name, null, default = nil) #:nodoc:
        unless null || default.nil?
          exec_query("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
        end
        alter_table(table_name) do |definition|
          definition[column_name].null = null
        end
      end

      def change_column(table_name, column_name, type, options = {}) #:nodoc:
        alter_table(table_name) do |definition|
          definition[column_name].instance_eval do
            self.type    = type
            self.limit   = options[:limit] if options.include?(:limit)
            self.default = options[:default] if options.include?(:default)
            self.null    = options[:null] if options.include?(:null)
            self.precision = options[:precision] if options.include?(:precision)
            self.scale = options[:scale] if options.include?(:scale)
            self.collation = options[:collation] if options.include?(:collation)
          end
        end
      end

      def rename_column(table_name, column_name, new_column_name) #:nodoc:
        column = column_for(table_name, column_name)
        alter_table(table_name, rename: { column.name => new_column_name.to_s })
        rename_column_indexes(table_name, column.name, new_column_name)
      end

      def add_reference(table_name, ref_name, **options) # :nodoc:
        super(table_name, ref_name, type: :integer, **options)
      end
      alias :add_belongs_to :add_reference

      def foreign_keys(table_name)
        fk_info = exec_query("PRAGMA foreign_key_list(#{quote(table_name)})", "SCHEMA")
        fk_info.map do |row|
          options = {
            column: row["from"],
            primary_key: row["to"],
            on_delete: extract_foreign_key_action(row["on_delete"]),
            on_update: extract_foreign_key_action(row["on_update"])
          }
          ForeignKeyDefinition.new(table_name, row["table"], options)
        end
      end

      def build_insert_sql(insert) # :nodoc:
        sql = +"INSERT #{insert.into} #{insert.values_list}"

        if insert.skip_duplicates?
          sql << " ON CONFLICT #{insert.conflict_target} DO NOTHING"
        elsif insert.update_duplicates?
          sql << " ON CONFLICT #{insert.conflict_target} DO UPDATE SET "
          sql << insert.updatable_columns.map { |column| "#{column}=excluded.#{column}" }.join(",")
        end

        sql
      end

      def get_database_version # :nodoc:
        SQLite3Adapter::Version.new(query_value("SELECT sqlite_version(*)"))
      end

      def check_version # :nodoc:
        if database_version < "3.8.0"
          raise "Your version of SQLite (#{database_version}) is too old. Active Record supports SQLite >= 3.8."
        end
      end

      private
        # See https://www.sqlite.org/limits.html,
        # the default value is 999 when not configured.
        def bind_params_length
          999
        end

        def initialize_type_map(m = type_map)
          super
          register_class_with_limit m, %r(int)i, SQLite3Integer
        end

        def table_structure(table_name)
          structure = exec_query("PRAGMA table_info(#{quote_table_name(table_name)})", "SCHEMA")
          raise(ActiveRecord::StatementInvalid, "Could not find table '#{table_name}'") if structure.empty?
          table_structure_with_collation(table_name, structure)
        end
        alias column_definitions table_structure

        # See: https://www.sqlite.org/lang_altertable.html
        # SQLite has an additional restriction on the ALTER TABLE statement
        def invalid_alter_table_type?(type, options)
          type.to_sym == :primary_key || options[:primary_key] ||
            options[:null] == false && options[:default].nil?
        end

        def alter_table(table_name, foreign_keys = foreign_keys(table_name), **options)
          altered_table_name = "a#{table_name}"

          caller = lambda do |definition|
            rename = options[:rename] || {}
            foreign_keys.each do |fk|
              if column = rename[fk.options[:column]]
                fk.options[:column] = column
              end
              to_table = strip_table_name_prefix_and_suffix(fk.to_table)
              definition.foreign_key(to_table, **fk.options)
            end

            yield definition if block_given?
          end

          transaction do
            disable_referential_integrity do
              move_table(table_name, altered_table_name, options.merge(temporary: true))
              move_table(altered_table_name, table_name, &caller)
            end
          end
        end

        def move_table(from, to, options = {}, &block)
          copy_table(from, to, options, &block)
          drop_table(from)
        end

        def copy_table(from, to, options = {})
          from_primary_key = primary_key(from)
          options[:id] = false
          create_table(to, **options) do |definition|
            @definition = definition
            if from_primary_key.is_a?(Array)
              @definition.primary_keys from_primary_key
            end
            columns(from).each do |column|
              column_name = options[:rename] ?
                (options[:rename][column.name] ||
                 options[:rename][column.name.to_sym] ||
                 column.name) : column.name

              @definition.column(column_name, column.type,
                limit: column.limit, default: column.default,
                precision: column.precision, scale: column.scale,
                null: column.null, collation: column.collation,
                primary_key: column_name == from_primary_key
              )
            end

            yield @definition if block_given?
          end
          copy_table_indexes(from, to, options[:rename] || {})
          copy_table_contents(from, to,
            @definition.columns.map(&:name),
            options[:rename] || {})
        end

        def copy_table_indexes(from, to, rename = {})
          indexes(from).each do |index|
            name = index.name
            if to == "a#{from}"
              name = "t#{name}"
            elsif from == "a#{to}"
              name = name[1..-1]
            end

            columns = index.columns
            if columns.is_a?(Array)
              to_column_names = columns(to).map(&:name)
              columns = columns.map { |c| rename[c] || c }.select do |column|
                to_column_names.include?(column)
              end
            end

            unless columns.empty?
              # index name can't be the same
              opts = { name: name.gsub(/(^|_)(#{from})_/, "\\1#{to}_"), internal: true }
              opts[:unique] = true if index.unique
              opts[:where] = index.where if index.where
              add_index(to, columns, opts)
            end
          end
        end

        def copy_table_contents(from, to, columns, rename = {})
          column_mappings = Hash[columns.map { |name| [name, name] }]
          rename.each { |a| column_mappings[a.last] = a.first }
          from_columns = columns(from).collect(&:name)
          columns = columns.find_all { |col| from_columns.include?(column_mappings[col]) }
          from_columns_to_copy = columns.map { |col| column_mappings[col] }
          quoted_columns = columns.map { |col| quote_column_name(col) } * ","
          quoted_from_columns = from_columns_to_copy.map { |col| quote_column_name(col) } * ","

          exec_query("INSERT INTO #{quote_table_name(to)} (#{quoted_columns})
                     SELECT #{quoted_from_columns} FROM #{quote_table_name(from)}")
        end

        def translate_exception(exception, message:, sql:, binds:)
          case exception.message
          # SQLite 3.8.2 returns a newly formatted error message:
          #   UNIQUE constraint failed: *table_name*.*column_name*
          # Older versions of SQLite return:
          #   column *column_name* is not unique
          when /column(s)? .* (is|are) not unique/, /UNIQUE constraint failed: .*/
            RecordNotUnique.new(message, sql: sql, binds: binds)
          when /.* may not be NULL/, /NOT NULL constraint failed: .*/
            NotNullViolation.new(message, sql: sql, binds: binds)
          when /FOREIGN KEY constraint failed/i
            InvalidForeignKey.new(message, sql: sql, binds: binds)
          else
            super
          end
        end

        COLLATE_REGEX = /.*\"(\w+)\".*collate\s+\"(\w+)\".*/i.freeze

        def table_structure_with_collation(table_name, basic_structure)
          collation_hash = {}
          sql = <<~SQL
            SELECT sql FROM
              (SELECT * FROM sqlite_master UNION ALL
               SELECT * FROM sqlite_temp_master)
            WHERE type = 'table' AND name = #{quote(table_name)}
          SQL

          # Result will have following sample string
          # CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
          #                       "password_digest" varchar COLLATE "NOCASE");
          result = exec_query(sql, "SCHEMA").first

          if result
            # Splitting with left parentheses and discarding the first part will return all
            # columns separated with comma(,).
            columns_string = result["sql"].split("(", 2).last

            columns_string.split(",").each do |column_string|
              # This regex will match the column name and collation type and will save
              # the value in $1 and $2 respectively.
              collation_hash[$1] = $2 if COLLATE_REGEX =~ column_string
            end

            basic_structure.map! do |column|
              column_name = column["name"]

              if collation_hash.has_key? column_name
                column["collation"] = collation_hash[column_name]
              end

              column
            end
          else
            basic_structure.to_a
          end
        end

        def arel_visitor
          Arel::Visitors::SQLite.new(self)
        end

        def build_statement_pool
          StatementPool.new(self.class.type_cast_config_to_integer(@config[:statement_limit]))
        end

        def connect
          @connection = ::SQLite3::Database.new(
            @config[:database].to_s,
            @config.merge(results_as_hash: true)
          )
          configure_connection
        end

        def configure_connection
          @connection.busy_timeout(self.class.type_cast_config_to_integer(@config[:timeout])) if @config[:timeout]

          execute("PRAGMA foreign_keys = ON", "SCHEMA")
        end

        class SQLite3Integer < Type::Integer # :nodoc:
          private
            def _limit
              # INTEGER storage class can be stored 8 bytes value.
              # See https://www.sqlite.org/datatype3.html#storage_classes_and_datatypes
              limit || 8
            end
        end

        ActiveRecord::Type.register(:integer, SQLite3Integer, adapter: :sqlite3)
    end
    ActiveSupport.run_load_hooks(:active_record_sqlite3adapter, SQLite3Adapter)
  end
end