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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
describe "Nodes::IsNotDistinctFrom" do
it "should construct a valid generic SQL statement" do
test = Table.new(:users)[:name].is_not_distinct_from "Aaron Patterson"
compile(test).must_be_like %{
CASE WHEN "users"."name" = 'Aaron Patterson' OR ("users"."name" IS NULL AND 'Aaron Patterson' IS NULL) THEN 0 ELSE 1 END = 0
}
end
it "should handle column names on both sides" do
test = Table.new(:users)[:first_name].is_not_distinct_from Table.new(:users)[:last_name]
compile(test).must_be_like %{
CASE WHEN "users"."first_name" = "users"."last_name" OR ("users"."first_name" IS NULL AND "users"."last_name" IS NULL) THEN 0 ELSE 1 END = 0
}
end
it "should handle nil" do
@table = Table.new(:users)
val = Nodes.build_quoted(nil, @table[:active])
sql = compile Nodes::IsNotDistinctFrom.new(@table[:name], val)
sql.must_be_like %{ "users"."name" IS NULL }
end
end
describe "Nodes::IsDistinctFrom" do
it "should handle column names on both sides" do
test = Table.new(:users)[:first_name].is_distinct_from Table.new(:users)[:last_name]
compile(test).must_be_like %{
CASE WHEN "users"."first_name" = "users"."last_name" OR ("users"."first_name" IS NULL AND "users"."last_name" IS NULL) THEN 0 ELSE 1 END = 1
}
end
it "should handle nil" do
@table = Table.new(:users)
val = Nodes.build_quoted(nil, @table[:active])
sql = compile Nodes::IsDistinctFrom.new(@table[:name], val)
sql.must_be_like %{ "users"."name" IS NOT NULL }
end
end
end
end
end
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