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# frozen_string_literal: true
require_relative "../helper"
module Arel
module Visitors
class MysqlTest < Arel::Spec
before do
@visitor = MySQL.new Table.engine.connection
end
def compile(node)
@visitor.accept(node, Collectors::SQLString.new).value
end
it "squashes parenthesis on multiple unions" do
subnode = Nodes::Union.new Arel.sql("left"), Arel.sql("right")
node = Nodes::Union.new subnode, Arel.sql("topright")
assert_equal 1, compile(node).scan("(").length
subnode = Nodes::Union.new Arel.sql("left"), Arel.sql("right")
node = Nodes::Union.new Arel.sql("topleft"), subnode
assert_equal 1, compile(node).scan("(").length
end
###
# :'(
# http://dev.mysql.com/doc/refman/5.0/en/select.html#id3482214
it "defaults limit to 18446744073709551615" do
stmt = Nodes::SelectStatement.new
stmt.offset = Nodes::Offset.new(1)
sql = compile(stmt)
sql.must_be_like "SELECT FROM DUAL LIMIT 18446744073709551615 OFFSET 1"
end
it "should escape LIMIT" do
sc = Arel::Nodes::UpdateStatement.new
sc.relation = Table.new(:users)
sc.limit = Nodes::Limit.new(Nodes.build_quoted("omg"))
assert_equal("UPDATE \"users\" LIMIT 'omg'", compile(sc))
end
it "uses DUAL for empty from" do
stmt = Nodes::SelectStatement.new
sql = compile(stmt)
sql.must_be_like "SELECT FROM DUAL"
end
describe "locking" do
it "defaults to FOR UPDATE when locking" do
node = Nodes::Lock.new(Arel.sql("FOR UPDATE"))
compile(node).must_be_like "FOR UPDATE"
end
it "allows a custom string to be used as a lock" do
node = Nodes::Lock.new(Arel.sql("LOCK IN SHARE MODE"))
compile(node).must_be_like "LOCK IN SHARE MODE"
end
end
describe "concat" do
it "concats columns" do
@table = Table.new(:users)
query = @table[:name].concat(@table[:name])
compile(query).must_be_like %{
CONCAT("users"."name", "users"."name")
}
end
it "concats a string" do
@table = Table.new(:users)
query = @table[:name].concat(Nodes.build_quoted("abc"))
compile(query).must_be_like %{
CONCAT("users"."name", 'abc')
}
end
end
end
end
end
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