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Hash

Sequel extends Hash 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 120
def &(ce)
  ::Sequel::SQL::BooleanExpression.new(:AND, self, ce)
end
case(*args) 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 on ruby 1.8, 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 150
def case(*args)
  ::Sequel::SQL::CaseExpression.new(to_a, *args)
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 160
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 169
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 178
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 130
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 139
def ~
  ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR, true)
end

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