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improve do update set/excluded examples

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Signed-off-by: Sean Corfield <sean@corfield.org>
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Sean Corfield 2024-04-20 10:03:06 -07:00
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CHANGELOG.md
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@ -2,6 +2,7 @@
* 2.6.next in progress
* Address [#527](https://github.com/seancorfield/honeysql/issues/527) by adding tests and more documentation for `:composite`.
* Add example of mixed `DO UPDATE SET` with `EXCLUDED` and regular SQL expressions.
* Update Clojure versions (to 1.11.2 and 1.12.0-alpha9); update other dev/test dependencies.
* 2.6.1126 -- 2024-03-04

18
doc/postgresql.md
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@ -293,6 +293,24 @@ DO UPDATE SET counter = table.counter + ?
" "id" 1 1]
```
You can use `:EXCLUDED.column` in a hash map to produce the
same effect as `:column` in a vector:
```clojure
user=> (-> (insert-into :table)
(values [{:id "id" :counter 1}])
(on-conflict :id)
(do-update-set {:name :EXCLUDED.name
:counter [:+ :table.counter 1]})
(sql/format {:pretty true}))
["
INSERT INTO table (id, counter)
VALUES (?, ?)
ON CONFLICT (id)
DO UPDATE SET name = EXCLUDED.name, counter = table.counter + ?
" "id" 1 1]
```
If you need to combine a `DO UPDATE SET` hash map expression
with a `WHERE` clause, you need to explicitly use the `:fields` /
`:where` format explained above. Here's how those two examples