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| author |  Adam Chlipala <adam@chlipala.net> | 2014-06-25 14:04:13 -0400 |
|---|---|---|
| committer | Adam Chlipala <adam@chlipala.net> | 2014-06-25 14:04:13 -0400 |
| commit | 547fc262a0cdf2363f8eb9ec75bea2f3dcaa9e83 (patch) | |
| tree | aa657a36e2c449a4aa47aac3b924487db6097d9a /tests/tags.ur | |
| parent | 9e8624b754e546e547b047e50e30bcba3259d1f6 (diff) | |
New syntactic shorthand for antiquoting subqueries
Diffstat (limited to 'tests/tags.ur')
| -rw-r--r-- | tests/tags.ur | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tests/tags.ur b/tests/tags.ur new file mode 100644 index 00000000..1213d824 --- /dev/null +++ b/tests/tags.ur @@ -0,0 +1,23 @@ +table images : { Id : int, Content : blob } +table tags : { Id : int, Tag : string } + +datatype mode = Present | Absent +type condition = { Tag : string, Mode : mode } + +type tag_query = sql_query [] [] [] [Id = int] + +fun addCondition (c : condition) (q : tag_query) : tag_query = + case c.Mode of + Present => (SELECT I.Id AS Id + FROM ({{q}}) AS I + JOIN tags ON tags.Id = I.Id AND tags.Tag = {[c.Tag]}) + | Absent => q + +fun withConditions (cs : list condition) : tag_query = + List.foldl addCondition (SELECT images.Id AS Id FROM images) cs + +fun main (cs : list condition) : transaction page = + x <- queryX (withConditions cs) (fn r => <xml><li>{[r.Id]}</li></xml>); + return <xml><body> + {x} + </body></xml> |