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author | Yasuo Honda <yasuo.honda@gmail.com> | 2014-11-04 04:44:01 +0900 |
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committer | Yasuo Honda <yasuo.honda@gmail.com> | 2015-06-19 23:02:58 +0000 |
commit | 0e1427e917a4e47dce9f02ad9309600073622c73 (patch) | |
tree | aa87b1860def6939c47cb46b236105f8b8c42bc2 /test/visitors | |
parent | 8d04c28b619212f99e6ce534f75ebda59bb200a1 (diff) | |
download | rails-0e1427e917a4e47dce9f02ad9309600073622c73.tar.gz rails-0e1427e917a4e47dce9f02ad9309600073622c73.tar.bz2 rails-0e1427e917a4e47dce9f02ad9309600073622c73.zip |
Create Arel::Visitors::Oracle12 to provide better top-N query
to support `FETCH FIRST n ROWS` and `OFFSET` for Oracle 12c database
Diffstat (limited to 'test/visitors')
-rw-r--r-- | test/visitors/test_oracle12.rb | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/test/visitors/test_oracle12.rb b/test/visitors/test_oracle12.rb new file mode 100644 index 0000000000..cfa130fcab --- /dev/null +++ b/test/visitors/test_oracle12.rb @@ -0,0 +1,47 @@ +require 'helper' + +module Arel + module Visitors + describe 'the oracle visitor' do + before do + @visitor = Oracle12.new Table.engine.connection_pool + end + + def compile node + @visitor.accept(node, Collectors::SQLString.new).value + 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 = compile Nodes::Except.new(left, right) + sql.must_be_like %{ + ( SELECT * FROM users WHERE age > 10 MINUS SELECT * FROM users WHERE age > 20 ) + } + end + + it 'generates select options offset then limit' do + stmt = Nodes::SelectStatement.new + stmt.offset = Nodes::Offset.new(1) + stmt.limit = Nodes::Limit.new(Nodes.build_quoted(10)) + sql = compile(stmt) + sql.must_be_like "SELECT OFFSET 1 ROWS FETCH FIRST 10 ROWS ONLY" + end + + describe 'locking' do + it 'removes limit when locking' do + stmt = Nodes::SelectStatement.new + stmt.limit = Nodes::Limit.new(Nodes.build_quoted(10)) + stmt.lock = Nodes::Lock.new(Arel.sql('FOR UPDATE')) + sql = compile(stmt) + sql.must_be_like "SELECT FOR UPDATE" + end + + it 'defaults to FOR UPDATE when locking' do + node = Nodes::Lock.new(Arel.sql('FOR UPDATE')) + compile(node).must_be_like "FOR UPDATE" + end + end + end + end +end |