### Home Classes Methods

### In Files

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

### Methods

- #complex_expression_sql
- #constant_sql
- #delete
- #explain
- #having
- #quoted_identifier
- #supports_intersect_except_all?
- #supports_is_true?
- #supports_multiple_column_in?
- #supports_timestamp_timezones?

### Files

- CHANGELOG
- COPYING
- README.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.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
- 3.2.0.txt
- 3.3.0.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
- sharding.rdoc
- sql.rdoc
- virtual_rows.rdoc

### Class/Module Index

Quicksearch

- Sequel
- Sequel::ADO
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- Sequel::Plugins::Timestamps::InstanceMethods
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- Sequel::Plugins::Touch::InstanceMethods
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- Sequel::Plugins::TypecastOnLoad::ClassMethods
- Sequel::Plugins::TypecastOnLoad::InstanceMethods
- Sequel::Plugins::UpdatePrimaryKey
- Sequel::Plugins::UpdatePrimaryKey::ClassMethods
- Sequel::Plugins::UpdatePrimaryKey::InstanceMethods
- Sequel::Plugins::ValidationClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods::Generator
- Sequel::Plugins::ValidationClassMethods::InstanceMethods
- Sequel::Plugins::ValidationHelpers
- Sequel::Plugins::ValidationHelpers::InstanceMethods
- Sequel::PoolTimeout
- Sequel::Postgres
- Sequel::Postgres::Adapter
- Sequel::Postgres::AdapterMethods
- Sequel::Postgres::Database
- Sequel::Postgres::DatabaseMethods
- Sequel::Postgres::Dataset
- Sequel::Postgres::Dataset::ArgumentMapper
- Sequel::Postgres::Dataset::BindArgumentMethods
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- Sequel::Postgres::DatasetMethods
- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
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- Sequel::Progress::DatabaseMethods
- Sequel::Progress::DatasetMethods
- Sequel::Rollback
- Sequel::SQL
- Sequel::SQL::AliasMethods
- Sequel::SQL::AliasedExpression
- Sequel::SQL::BitwiseMethods
- Sequel::SQL::Blob
- Sequel::SQL::BooleanConstant
- Sequel::SQL::BooleanExpression
- Sequel::SQL::BooleanMethods
- Sequel::SQL::CaseExpression
- Sequel::SQL::Cast
- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
- Sequel::SQL::ComplexExpression
- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::Expression
- Sequel::SQL::Function
- Sequel::SQL::GenericComplexExpression
- Sequel::SQL::GenericExpression
- Sequel::SQL::Identifier
- Sequel::SQL::IdentifierMethods
- Sequel::SQL::InequalityMethods
- Sequel::SQL::JoinClause
- Sequel::SQL::JoinOnClause
- Sequel::SQL::JoinUsingClause
- Sequel::SQL::NegativeBooleanConstant
- Sequel::SQL::NoBooleanInputMethods
- Sequel::SQL::NumericExpression
- Sequel::SQL::NumericMethods
- Sequel::SQL::OrderMethods
- Sequel::SQL::OrderedExpression
- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
- Sequel::SQL::QualifyingMethods
- Sequel::SQL::SQLArray
- Sequel::SQL::StringConcatenationMethods
- Sequel::SQL::StringExpression
- Sequel::SQL::StringMethods
- Sequel::SQL::Subscript
- Sequel::SQL::SubscriptMethods
- Sequel::SQL::VirtualRow
- Sequel::SQL::Window
- Sequel::SQL::WindowFunction
- Sequel::SQLite
- Sequel::SQLite::Database
- Sequel::SQLite::DatabaseMethods
- Sequel::SQLite::Dataset
- Sequel::SQLite::Dataset::ArgumentMapper
- Sequel::SQLite::Dataset::PreparedStatementMethods
- Sequel::SQLite::DatasetMethods
- Sequel::Schema
- Sequel::Schema::AlterTableGenerator
- Sequel::Schema::Generator
- Sequel::ShardedSingleConnectionPool
- Sequel::ShardedThreadedConnectionPool
- Sequel::SimpleMigration
- Sequel::SingleConnectionPool
- Sequel::ThreadLocalTimezones
- Sequel::ThreadedConnectionPool
- Sequel::TimestampMigrator
- Sequel::Timezones
- Sequel::ValidationFailed
- String
- String::Inflections
- Array
- FalseClass
- Hash
- NilClass
- Numeric
- Object
- PGconn
- PGresult
- Proc
- Symbol
- TrueClass

No matching classes.

# Sequel::SQLite::DatasetMethods

Instance methods for datasets that connect to an SQLite database

### Constants

CONSTANT_MAP
SELECT_CLAUSE_METHODS

### Public Instance Methods

complex_expression_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 292
    def complex_expression_sql(op, args)
      case op
      when :~, :'!~', :'~*', :'!~*'
        raise Error, "SQLite does not support pattern matching via regular expressions"
      when :LIKE, :'NOT LIKE', :ILIKE, :'NOT ILIKE'
        # SQLite is case insensitive for ASCII, and non case sensitive for other character sets
        "#{'NOT ' if [:'NOT LIKE', :'NOT ILIKE'].include?(op)}(#{literal(args.at(0))} LIKE #{literal(args.at(1))})"
      else
        super(op, args)
      end
    end

constant_sql(constant) click to toggle source

MSSQL doesn't support the SQL standard CURRENT_DATE or CURRENT_TIME

    # File lib/sequel/adapters/shared/sqlite.rb, line 305
    def constant_sql(constant)
      CONSTANT_MAP[constant] || super
    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 312
    def delete
      @opts[:where] ? super : filter(1=>1).delete
    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 318
    def explain
      db.send(:metadata_dataset).clone(:sql=>"EXPLAIN #{select_sql}").
        map{|x| "#{x[:addr]}|#{x[:opcode]}|#{(1..5).map{|i| x[:"p#{i}"]}.join('|')}|#{x[:comment]}"}
    end

having(*cond, &block) click to toggle source

HAVING requires GROUP BY on SQLite

    # File lib/sequel/adapters/shared/sqlite.rb, line 324
    def having(*cond, &block)
      raise(InvalidOperation, "Can only specify a HAVING clause on a grouped dataset") unless @opts[:group]
      super
    end

quoted_identifier(c) click to toggle source

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

    # File lib/sequel/adapters/shared/sqlite.rb, line 330
    def quoted_identifier(c)
      "`#{c}`"
    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 335
    def supports_intersect_except_all?
      false
    end

supports_is_true?() click to toggle source

SQLite does not support IS TRUE

    # File lib/sequel/adapters/shared/sqlite.rb, line 340
    def supports_is_true?
      false
    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 345
    def supports_multiple_column_in?
      false
    end

supports_timestamp_timezones?() click to toggle source

SQLite supports timezones in literal timestamps, since it stores them as text.

    # File lib/sequel/adapters/shared/sqlite.rb, line 351
    def supports_timestamp_timezones?
      true
    end

[Validate]

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