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require 'helper'
module Arel
module Visitors
describe 'the oracle visitor' do
before do
@visitor = Oracle.new Table.engine
end
it 'modifies order when there is distinct and first value' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('foo')
sql = @visitor.accept(stmt)
sql.must_be_like %{
SELECT #{select} ORDER BY alias_0__
}
end
it 'is idempotent with crazy query' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('foo')
sql = @visitor.accept(stmt)
sql2 = @visitor.accept(stmt)
sql.must_equal sql2
end
it 'splits orders with commas' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('foo, bar')
sql = @visitor.accept(stmt)
sql.must_be_like %{
SELECT #{select} ORDER BY alias_0__, alias_1__
}
end
it 'splits orders with commas and function calls' do
# *sigh*
select = "DISTINCT foo.id, FIRST_VALUE(projects.name) OVER (foo) AS alias_0__"
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new(select)
stmt.orders << Nodes::SqlLiteral.new('NVL(LOWER(bar, foo), foo) DESC, UPPER(baz)')
sql = @visitor.accept(stmt)
sql.must_be_like %{
SELECT #{select} ORDER BY alias_0__ DESC, alias_1__
}
end
describe 'Nodes::SelectStatement' do
describe 'limit' do
it 'adds a rownum clause' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{ SELECT WHERE ROWNUM <= 10 }
end
it 'is idempotent' do
stmt = Nodes::SelectStatement.new
stmt.orders << Nodes::SqlLiteral.new('foo')
stmt.limit = Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql2 = @visitor.accept stmt
sql.must_equal sql2
end
it 'creates a subquery when there is order_by' do
stmt = Nodes::SelectStatement.new
stmt.orders << Nodes::SqlLiteral.new('foo')
stmt.limit = Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (SELECT ORDER BY foo) WHERE ROWNUM <= 10
}
end
it 'creates a subquery when there is DISTINCT' do
stmt = Nodes::SelectStatement.new
stmt.cores.first.projections << Nodes::SqlLiteral.new('DISTINCT id')
stmt.limit = Arel::Nodes::Limit.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (SELECT DISTINCT id) WHERE ROWNUM <= 10
}
end
it 'creates a different subquery when there is an offset' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
stmt.offset = Nodes::Offset.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (
SELECT raw_sql_.*, rownum raw_rnum_
FROM (SELECT) raw_sql_
WHERE rownum <= 20
)
WHERE raw_rnum_ > 10
}
end
it 'is idempotent with different subquery' do
stmt = Nodes::SelectStatement.new
stmt.limit = Nodes::Limit.new(10)
stmt.offset = Nodes::Offset.new(10)
sql = @visitor.accept stmt
sql2 = @visitor.accept stmt
sql.must_equal sql2
end
end
describe 'only offset' do
it 'creates a select from subquery with rownum condition' do
stmt = Nodes::SelectStatement.new
stmt.offset = Nodes::Offset.new(10)
sql = @visitor.accept stmt
sql.must_be_like %{
SELECT * FROM (
SELECT raw_sql_.*, rownum raw_rnum_
FROM (SELECT) raw_sql_
)
WHERE raw_rnum_ > 10
}
end
end
end
it 'modified except to be minus' do
left = Nodes::SqlLiteral.new("SELECT * FROM users WHERE age > 10")
right = Nodes::SqlLiteral.new("SELECT * FROM users WHERE age > 20")
sql = @visitor.accept Nodes::Except.new(left, right)
sql.must_be_like %{
( SELECT * FROM users WHERE age > 10 MINUS SELECT * FROM users WHERE age > 20 )
}
end
end
end
end
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