### Home Classes Methods

### In Files

- lib/sequel/core_sql.rb

### Parent

Object

### Methods

- #&
- #case
- #sql_expr
- #sql_negate
- #sql_or
- #|
- #~

### 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::TypecastOnLoad::ClassMethods
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- 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
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- Sequel::PoolTimeout
- Sequel::Postgres
- Sequel::Postgres::Adapter
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- Sequel::Postgres::DatasetMethods
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- Sequel::PrettyTable
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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.

# Hash

Sequel extends the Hash class to add methods to implement the SQL DSL.

### Public Instance Methods

&(ce) click to toggle source

Return a Sequel::SQL::BooleanExpression created from this hash, matching all of the conditions in this hash and the condition specified by the given argument.

    {:a=>1} & :b # SQL: a = 1 AND b
    {:a=>true} & ~:b # SQL: a IS TRUE AND NOT b

    # File lib/sequel/core_sql.rb, line 111
    def &(ce)
      ::Sequel::SQL::BooleanExpression.new(:AND, self, ce)
    end

case(default, expression = nil) click to toggle source

Return a Sequel::SQL::CaseExpression with this hash as the conditions and the given default value. Note that the order of the conditions will be arbitrary, so all conditions should be orthogonal.

    {{:a=>[2,3]}=>1}.case(0) # SQL: CASE WHEN a IN (2, 3) THEN 1 ELSE 0 END
    {:a=>1, {:b=>2}].case(:d, :c) # SQL: CASE c WHEN a THEN 1 WHEN b THEN 2 ELSE d END
                                  #  or: CASE c WHEN b THEN 2 WHEN a THEN 1 ELSE d END

    # File lib/sequel/core_sql.rb, line 141
    def case(default, expression = nil)
      ::Sequel::SQL::CaseExpression.new(to_a, default, expression)
    end

sql_expr() click to toggle source

Return a Sequel::SQL::BooleanExpression created from this hash, matching all of the conditions. Rarely do you need to call this explicitly, as Sequel generally assumes that hashes specify this type of condition.

    {:a=>true}.sql_expr # SQL: a IS TRUE
    {:a=>1, :b=>[2, 3]}.sql_expr # SQL: a = 1 AND b IN (2, 3)

    # File lib/sequel/core_sql.rb, line 151
    def sql_expr
      ::Sequel::SQL::BooleanExpression.from_value_pairs(self)
    end

sql_negate() click to toggle source

Return a Sequel::SQL::BooleanExpression created from this hash, matching none of the conditions.

    {:a=>true}.sql_negate # SQL: a IS NOT TRUE
    {:a=>1, :b=>[2, 3]}.sql_negate # SQL: a != 1 AND b NOT IN (2, 3)

    # File lib/sequel/core_sql.rb, line 160
    def sql_negate
      ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :AND, true)
    end

sql_or() click to toggle source

Return a Sequel::SQL::BooleanExpression created from this hash, matching any of the conditions.

    {:a=>true}.sql_or # SQL: a IS TRUE
    {:a=>1, :b=>[2, 3]}.sql_or # SQL: a = 1 OR b IN (2, 3)

    # File lib/sequel/core_sql.rb, line 169
    def sql_or
      ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR)
    end

|(ce) click to toggle source

Return a Sequel::SQL::BooleanExpression created from this hash, matching all of the conditions in this hash or the condition specified by the given argument.

    {:a=>1} | :b # SQL: a = 1 OR b
    {:a=>true} | ~:b # SQL: a IS TRUE OR NOT b

    # File lib/sequel/core_sql.rb, line 121
    def |(ce)
      ::Sequel::SQL::BooleanExpression.new(:OR, self, ce)
    end

~() click to toggle source

Return a Sequel::SQL::BooleanExpression created from this hash, not matching all of the conditions.

    ~{:a=>true} # SQL: a IS NOT TRUE
    ~{:a=>1, :b=>[2, 3]} # SQL: a != 1 OR b NOT IN (2, 3)

    # File lib/sequel/core_sql.rb, line 130
    def ~
      ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR, true)
    end

[Validate]

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