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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

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