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require 'helper'
module Arel
module Visitors
describe 'the mssql visitor' do
before do
@visitor = MSSQL.new Table.engine.connection
@table = Arel::Table.new "users"
end
it 'should not modify query if no offset or limit' do
stmt = Nodes::SelectStatement.new
sql = @visitor.accept(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 = @visitor.accept(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 '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 = @visitor.accept(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 = @visitor.accept(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 = @visitor.accept(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 = @visitor.accept(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 = @visitor.accept(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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