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# frozen_string_literal: true
require_relative "../helper"
module Arel
module Visitors
class MssqlTest < Arel::Spec
before do
@visitor = MSSQL.new Table.engine.connection
@table = Arel::Table.new "users"
end
def compile(node)
@visitor.accept(node, Collectors::SQLString.new).value
end
it "should not modify query if no offset or limit" do
stmt = Nodes::SelectStatement.new
sql = compile(stmt)
sql.must_be_like "SELECT"
end
it "should go over table PK if no .order() or .group()" do
stmt = Nodes::SelectStatement.new
stmt.cores.first.from = @table
stmt.limit = Nodes::Limit.new(10)
sql = compile(stmt)
sql.must_be_like "SELECT _t.* FROM (SELECT ROW_NUMBER() OVER (ORDER BY \"users\".\"id\") as _row_num FROM \"users\") as _t WHERE _row_num BETWEEN 1 AND 10"
end
it "caches the PK lookup for order" do
connection = Minitest::Mock.new
connection.expect(:primary_key, ["id"], ["users"])
# We don't care how many times these methods are called
def connection.quote_table_name(*); ""; end
def connection.quote_column_name(*); ""; end
@visitor = MSSQL.new(connection)
stmt = Nodes::SelectStatement.new
stmt.cores.first.from = @table
stmt.limit = Nodes::Limit.new(10)
compile(stmt)
compile(stmt)
connection.verify
end
it "should use TOP for limited deletes" do
stmt = Nodes::DeleteStatement.new
stmt.relation = @table
stmt.limit = Nodes::Limit.new(10)
sql = compile(stmt)
sql.must_be_like "DELETE TOP (10) FROM \"users\""
end
it "should go over query ORDER BY if .order()" do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
stmt.orders << Nodes::SqlLiteral.new("order_by")
sql = compile(stmt)
sql.must_be_like "SELECT _t.* FROM (SELECT ROW_NUMBER() OVER (ORDER BY order_by) as _row_num) as _t WHERE _row_num BETWEEN 1 AND 10"
end
it "should go over query GROUP BY if no .order() and there is .group()" do
stmt = Nodes::SelectStatement.new
stmt.cores.first.groups << Nodes::SqlLiteral.new("group_by")
stmt.limit = Nodes::Limit.new(10)
sql = compile(stmt)
sql.must_be_like "SELECT _t.* FROM (SELECT ROW_NUMBER() OVER (ORDER BY group_by) as _row_num GROUP BY group_by) as _t WHERE _row_num BETWEEN 1 AND 10"
end
it "should use BETWEEN if both .limit() and .offset" do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
stmt.offset = Nodes::Offset.new(20)
sql = compile(stmt)
sql.must_be_like "SELECT _t.* FROM (SELECT ROW_NUMBER() OVER (ORDER BY ) as _row_num) as _t WHERE _row_num BETWEEN 21 AND 30"
end
it "should use >= if only .offset" do
stmt = Nodes::SelectStatement.new
stmt.offset = Nodes::Offset.new(20)
sql = compile(stmt)
sql.must_be_like "SELECT _t.* FROM (SELECT ROW_NUMBER() OVER (ORDER BY ) as _row_num) as _t WHERE _row_num >= 21"
end
it "should generate subquery for .count" do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
stmt.cores.first.projections << Nodes::Count.new("*")
sql = compile(stmt)
sql.must_be_like "SELECT COUNT(1) as count_id FROM (SELECT _t.* FROM (SELECT ROW_NUMBER() OVER (ORDER BY ) as _row_num) as _t WHERE _row_num BETWEEN 1 AND 10) AS subquery"
end
end
end
end
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