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# frozen_string_literal: true
require_relative "../helper"
module Arel
module Visitors
class InformixTest < Arel::Spec
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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