aboutsummaryrefslogtreecommitdiffstats
path: root/test/visitors/test_oracle.rb
blob: 2c9bba15d8b1b7f38257bfa089bb53bb6ff37785 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
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 = 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 = 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 = 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 = 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 = 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 = 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
    end
  end
end