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Add support for SELECT without FROM

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Loic Nageleisen 2017-11-21 11:14:45 +01:00
parent 818da9047a
commit a3712ceefd
2 changed files with 10 additions and 1 deletions
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7
lib/rebel/sql.rb
View file

@ -180,7 +180,8 @@ module Rebel::SQL
def select(*fields, from: nil, where: nil, inner: nil, left: nil, right: nil)
raw <<-SQL
SELECT #{names(*fields)} FROM #{name(from)}
SELECT #{names(*fields)}
#{from?(from)}
#{inner?(inner)}
#{left?(left)}
#{right?(right)}
@ -329,6 +330,10 @@ module Rebel::SQL
end.join(' AND ')
end
def from?(from)
from ? "FROM #{name(from)}" : nil
end
def where?(*clause)
clause.any? ? "WHERE #{and_clause(*clause)}" : nil
end

4
test/test_raw.rb
View file

@ -105,6 +105,10 @@ class TestRaw < Minitest::Test
assert_str_equal(Rebel::SQL.select(Rebel::SQL.raw('*'), from: Rebel::SQL.name(:foo)).gsub(/\s+/, ' ').strip, 'SELECT * FROM "foo"')
end
def test_select_without_from
assert_str_equal(Rebel::SQL.select(Rebel::SQL.raw('1')).strip, 'SELECT 1')
end
def test_nested_select
assert_str_equal(Rebel::SQL.select(Rebel::SQL.raw('*'), from: Rebel::SQL.name(:foo), where: Rebel::SQL.name(:bar).in(Rebel::SQL.select(Rebel::SQL.name(:bar), from: Rebel::SQL.name(:foo)))).gsub(/\s+/, ' ').strip, 'SELECT * FROM "foo" WHERE "bar" IN ( SELECT "bar" FROM "foo" )')
end