### Home Classes Methods

### In Files

- lib/sequel/adapters/shared/sqlite.rb

### Methods

- #_truncate_sql
- #alias_qualified_column
- #as_sql_append
- #complex_expression_sql_append
- #constant_sql_append
- #delete
- #explain
- #having
- #identifier_list
- #literal_blob_append
- #literal_false
- #literal_true
- #quoted_identifier_append
- #select
- #select_clause_methods
- #select_lock_sql
- #supports_intersect_except_all?
- #supports_is_true?
- #supports_multiple_column_in?
- #supports_timestamp_timezones?
- #supports_where_true?

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

### Class Index

Quicksearch

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- Sequel::SQL::AliasMethods
- Sequel::SQL::AliasedExpression
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- Sequel::ToDot
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- Array
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No matching classes.

# Sequel::SQLite::DatasetMethods

Instance methods for datasets that connect to an SQLite database

### Constants

SELECT_CLAUSE_METHODS
CONSTANT_MAP
EXTRACT_MAP
NOT_SPACE
COMMA
PAREN_CLOSE
AS
APOS
EXTRACT_OPEN
EXTRACT_CLOSE
NUMERIC
INTEGER
BACKTICK
BLOB_START
HSTAR

### Public Instance Methods

complex_expression_sql_append(sql, op, args) click to toggle source

SQLite does not support pattern matching via regular expressions. SQLite is case insensitive (depending on pragma), so use LIKE for ILIKE.

         # File lib/sequel/adapters/shared/sqlite.rb, line 433
    433:       def complex_expression_sql_append(sql, op, args)
    434:         case op
    435:         when :~, :'!~', :'~*', :'!~*'
    436:           raise Error, "SQLite does not support pattern matching via regular expressions"
    437:         when :ILIKE
    438:           super(sql, :LIKE, args.map{|a| SQL::Function.new(:upper, a)})
    439:         when :"NOT LIKE", :"NOT ILIKE"
    440:           sql << NOT_SPACE
    441:           complex_expression_sql_append(sql, (op == :"NOT ILIKE" ? :ILIKE : :LIKE), args)
    442:         when :^
    443:           sql << complex_expression_arg_pairs(args) do |a, b|
    444:             a = literal(a)
    445:             b = literal(b)
    446:             "((~(#{a} & #{b})) & (#{a} | #{b}))"
    447:           end
    448:         when :extract
    449:           part = args.at(0)
    450:           raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part]
    451:           sql << EXTRACT_OPEN << format << COMMA
    452:           literal_append(sql, args.at(1))
    453:           sql << EXTRACT_CLOSE << (part == :second ? NUMERIC : INTEGER) << PAREN_CLOSE
    454:         else
    455:           super
    456:         end
    457:       end

constant_sql_append(sql, constant) click to toggle source

SQLite has CURRENT_TIMESTAMP and related constants in UTC instead of in localtime, so convert those constants to local time.

         # File lib/sequel/adapters/shared/sqlite.rb, line 461
    461:       def constant_sql_append(sql, constant)
    462:         if c = CONSTANT_MAP[constant]
    463:           sql << c
    464:         else
    465:           super
    466:         end
    467:       end

delete() click to toggle source

SQLite performs a TRUNCATE style DELETE if no filter is specified. Since we want to always return the count of records, add a condition that is always true and then delete.

         # File lib/sequel/adapters/shared/sqlite.rb, line 472
    472:       def delete
    473:         @opts[:where] ? super : filter(1=>1).delete
    474:       end

explain() click to toggle source

Return an array of strings specifying a query explanation for a SELECT of the current dataset.

         # File lib/sequel/adapters/shared/sqlite.rb, line 478
    478:       def explain
    479:         db.send(:metadata_dataset).clone(:sql=>"EXPLAIN #{select_sql}").
    480:           map{|x| "#{x[:addr]}|#{x[:opcode]}|#{(1..5).map{|i| x[:"p#{i}"]}.join('|')}|#{x[:comment]}"}
    481:       end

having(*cond) click to toggle source

HAVING requires GROUP BY on SQLite

         # File lib/sequel/adapters/shared/sqlite.rb, line 484
    484:       def having(*cond)
    485:         raise(InvalidOperation, "Can only specify a HAVING clause on a grouped dataset") unless @opts[:group]
    486:         super
    487:       end

quoted_identifier_append(sql, c) click to toggle source

SQLite uses the nonstandard ` (backtick) for quoting identifiers.

         # File lib/sequel/adapters/shared/sqlite.rb, line 490
    490:       def quoted_identifier_append(sql, c)
    491:         sql << BACKTICK << c.to_s << BACKTICK
    492:       end

select(*cols) click to toggle source

When a qualified column is selected on SQLite and the qualifier is a subselect, the column name used is the full qualified name (including the qualifier) instead of just the column name. To get correct column names, you must use an alias.

         # File lib/sequel/adapters/shared/sqlite.rb, line 498
    498:       def select(*cols)
    499:         if ((f = @opts[:from]) && f.any?{|t| t.is_a?(Dataset) || (t.is_a?(SQL::AliasedExpression) && t.expression.is_a?(Dataset))}) || ((j = @opts[:join]) && j.any?{|t| t.table.is_a?(Dataset)})
    500:           super(*cols.map{|c| alias_qualified_column(c)})
    501:         else
    502:           super
    503:         end
    504:       end

supports_intersect_except_all?() click to toggle source

SQLite does not support INTERSECT ALL or EXCEPT ALL

         # File lib/sequel/adapters/shared/sqlite.rb, line 507
    507:       def supports_intersect_except_all?
    508:         false
    509:       end

supports_is_true?() click to toggle source

SQLite does not support IS TRUE

         # File lib/sequel/adapters/shared/sqlite.rb, line 512
    512:       def supports_is_true?
    513:         false
    514:       end

supports_multiple_column_in?() click to toggle source

SQLite does not support multiple columns for the IN/NOT IN operators

         # File lib/sequel/adapters/shared/sqlite.rb, line 517
    517:       def supports_multiple_column_in?
    518:         false
    519:       end

supports_timestamp_timezones?() click to toggle source

SQLite supports timezones in literal timestamps, since it stores them as text. But using timezones in timestamps breaks SQLite datetime functions, so we allow the user to override the default per database.

         # File lib/sequel/adapters/shared/sqlite.rb, line 524
    524:       def supports_timestamp_timezones?
    525:         db.use_timestamp_timezones?
    526:       end

supports_where_true?() click to toggle source

SQLite cannot use WHERE ‘t’.

         # File lib/sequel/adapters/shared/sqlite.rb, line 529
    529:       def supports_where_true?
    530:         false
    531:       end

### Private Instance Methods

_truncate_sql(table) click to toggle source

SQLite treats a DELETE with no WHERE clause as a TRUNCATE

         # File lib/sequel/adapters/shared/sqlite.rb, line 590
    590:       def _truncate_sql(table)
    591:         "DELETE FROM #{table}"
    592:       end

alias_qualified_column(col) click to toggle source

If col is a qualified column, alias it to the same as the column name

         # File lib/sequel/adapters/shared/sqlite.rb, line 543
    543:       def alias_qualified_column(col)
    544:         case col
    545:         when Symbol
    546:           t, c, a = split_symbol(col)
    547:           if t && !a
    548:             alias_qualified_column(SQL::QualifiedIdentifier.new(t, c))
    549:           else
    550:             col
    551:           end
    552:         when SQL::QualifiedIdentifier
    553:           SQL::AliasedExpression.new(col, col.column)
    554:         else
    555:           col
    556:         end
    557:       end

as_sql_append(sql, aliaz) click to toggle source

SQLite uses string literals instead of identifiers in AS clauses.

         # File lib/sequel/adapters/shared/sqlite.rb, line 536
    536:       def as_sql_append(sql, aliaz)
    537:         aliaz = aliaz.value if aliaz.is_a?(SQL::Identifier)
    538:         sql << AS
    539:         literal_append(sql, aliaz.to_s)
    540:       end

identifier_list(columns) click to toggle source

SQL fragment specifying a list of identifiers

         # File lib/sequel/adapters/shared/sqlite.rb, line 560
    560:       def identifier_list(columns)
    561:         columns.map{|i| quote_identifier(i)}.join(COMMA)
    562:       end

literal_blob_append(sql, v) click to toggle source

SQLite uses a preceding X for hex escaping strings

         # File lib/sequel/adapters/shared/sqlite.rb, line 565
    565:       def literal_blob_append(sql, v)
    566:         sql << BLOB_START << v.unpack(HSTAR).first << APOS
    567:       end

literal_false() click to toggle source

Respect the database integer_booleans setting, using 0 or ‘f’.

         # File lib/sequel/adapters/shared/sqlite.rb, line 570
    570:       def literal_false
    571:         @db.integer_booleans ? '0' : "'f'"
    572:       end

literal_true() click to toggle source

Respect the database integer_booleans setting, using 1 or ‘t’.

         # File lib/sequel/adapters/shared/sqlite.rb, line 575
    575:       def literal_true
    576:         @db.integer_booleans ? '1' : "'t'"
    577:       end

select_clause_methods() click to toggle source

SQLite does not support the SQL WITH clause

         # File lib/sequel/adapters/shared/sqlite.rb, line 580
    580:       def select_clause_methods
    581:         SELECT_CLAUSE_METHODS
    582:       end

select_lock_sql(sql) click to toggle source

Support FOR SHARE locking when using the :share lock style.

         # File lib/sequel/adapters/shared/sqlite.rb, line 585
    585:       def select_lock_sql(sql)
    586:         super unless @opts[:lock] == :update
    587:       end

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