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require 'helper'
module Arel
module Visitors
describe 'the informix visitor' do
before do
@visitor = Informix.new Table.engine.connection
end
it 'uses LIMIT n to limit results' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(1)
sql = @visitor.accept(stmt)
sql.must_be_like "SELECT LIMIT 1"
end
it 'uses LIMIT n in updates with a limit' do
stmt = Nodes::UpdateStatement.new
stmt.limit = Nodes::Limit.new(1)
stmt.key = 'id'
sql = @visitor.accept(stmt)
sql.must_be_like "UPDATE NULL WHERE 'id' IN (SELECT LIMIT 1 'id')"
end
it 'uses SKIP n to jump results' do
stmt = Nodes::SelectStatement.new
stmt.offset = Nodes::Offset.new(10)
sql = @visitor.accept(stmt)
sql.must_be_like "SELECT SKIP 10"
end
it 'uses SKIP before LIMIT' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(1)
stmt.offset = Nodes::Offset.new(1)
sql = @visitor.accept(stmt)
sql.must_be_like "SELECT SKIP 1 LIMIT 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 = @visitor.accept(stmt)
sql.must_be_like 'SELECT FROM "posts" INNER JOIN "comments"'
end
end
end
end
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