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require 'helper'
module Arel
module Visitors
describe 'the informix visitor' do
before do
@visitor = Informix.new Table.engine.connection
end
def compile node
@visitor.accept(node, Collectors::SQLString.new).value
end
it 'uses FIRST n to limit results' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(1)
sql = compile(stmt)
sql.must_be_like "SELECT FIRST 1"
end
it 'uses FIRST n in updates with a limit' do
table = Table.new(:users)
stmt = Nodes::UpdateStatement.new
stmt.relation = table
stmt.limit = Nodes::Limit.new(Nodes.build_quoted(1))
stmt.key = table[:id]
sql = compile(stmt)
sql.must_be_like "UPDATE \"users\" WHERE \"users\".\"id\" IN (SELECT FIRST 1 \"users\".\"id\" FROM \"users\")"
end
it 'uses SKIP n to jump results' do
stmt = Nodes::SelectStatement.new
stmt.offset = Nodes::Offset.new(10)
sql = compile(stmt)
sql.must_be_like "SELECT SKIP 10"
end
it 'uses SKIP before FIRST' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(1)
stmt.offset = Nodes::Offset.new(1)
sql = compile(stmt)
sql.must_be_like "SELECT SKIP 1 FIRST 1"
end
it 'uses INNER JOIN to perform joins' do
core = Nodes::SelectCore.new
table = Table.new(:posts)
core.source = Nodes::JoinSource.new(table, [table.create_join(Table.new(:comments))])
stmt = Nodes::SelectStatement.new([core])
sql = compile(stmt)
sql.must_be_like 'SELECT FROM "posts" INNER JOIN "comments"'
end
end
end
end
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