activerecord/test/cases/arel/visitors/ibm_db_test.rb


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# frozen_string_literal: true

require_relative "../helper"

module Arel
  module Visitors
    class IbmDbTest < Arel::Spec
      before do
        @visitor = IBM_DB.new Table.engine.connection
      end

      def compile(node)
        @visitor.accept(node, Collectors::SQLString.new).value
      end

      it "uses FETCH FIRST n ROWS to limit results" do
        stmt = Nodes::SelectStatement.new
        stmt.limit = Nodes::Limit.new(1)
        sql = compile(stmt)
        sql.must_be_like "SELECT FETCH FIRST 1 ROWS ONLY"
      end

      it "uses FETCH FIRST n ROWS 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 \"users\".\"id\" FROM \"users\" FETCH FIRST 1 ROWS ONLY)"
      end
    end
  end
end