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require 'helper'
module Arel
module Visitors
describe 'the mysql visitor' do
before do
@visitor = MySQL.new Table.engine.connection
end
def compile node
@visitor.accept(node, Collectors::SQLString.new).value
end
it 'squashes parenthesis on multiple unions' do
subnode = Nodes::Union.new Arel.sql('left'), Arel.sql('right')
node = Nodes::Union.new subnode, Arel.sql('topright')
assert_equal 1, compile(node).scan('(').length
subnode = Nodes::Union.new Arel.sql('left'), Arel.sql('right')
node = Nodes::Union.new Arel.sql('topleft'), subnode
assert_equal 1, compile(node).scan('(').length
end
###
# :'(
# http://dev.mysql.com/doc/refman/5.0/en/select.html#id3482214
it 'defaults limit to 18446744073709551615' do
stmt = Nodes::SelectStatement.new
stmt.offset = Nodes::Offset.new(1)
sql = compile(stmt)
sql.must_be_like "SELECT FROM DUAL LIMIT 18446744073709551615 OFFSET 1"
end
it "should escape LIMIT" do
sc = Arel::Nodes::UpdateStatement.new
sc.relation = Table.new(:users)
sc.limit = Nodes::Limit.new(Nodes.build_quoted("omg"))
assert_equal("UPDATE \"users\" LIMIT 'omg'", compile(sc))
end
it 'uses DUAL for empty from' do
stmt = Nodes::SelectStatement.new
sql = compile(stmt)
sql.must_be_like "SELECT FROM DUAL"
end
describe 'locking' do
it 'defaults to FOR UPDATE when locking' do
node = Nodes::Lock.new(Arel.sql('FOR UPDATE'))
compile(node).must_be_like "FOR UPDATE"
end
it 'allows a custom string to be used as a lock' do
node = Nodes::Lock.new(Arel.sql('LOCK IN SHARE MODE'))
compile(node).must_be_like "LOCK IN SHARE MODE"
end
end
end
end
end
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