Update the upsert command.

Refs #1055
Kinto · Feb 1, 2017 · f5e3827 · f5e3827
1 parent c04a62a
commit f5e3827
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diff --git a/README.rst b/README.rst
@@ -37,4 +37,4 @@ Requirements
 ------------
 
 * **Python**: 2.7, 3.4+
-* **Backends**: In-memory (development), Postgresql 9.4+ (production)
+* **Backends**: In-memory (development), Postgresql 9.5+ (production)
diff --git a/kinto/core/cache/postgresql/__init__.py b/kinto/core/cache/postgresql/__init__.py
@@ -149,13 +149,11 @@ def set(self, key, value, ttl=None):
         if ttl is None:
             logger.warning("No TTL for cache key %r" % key)
         query = """
-        WITH upsert AS (
-            UPDATE cache SET value = :value, ttl = sec2ttl(:ttl)
-             WHERE key=:key
-            RETURNING *)
         INSERT INTO cache (key, value, ttl)
-        SELECT :key, :value, sec2ttl(:ttl)
-        WHERE NOT EXISTS (SELECT * FROM upsert)
+        VALUES (:key, :value, sec2ttl(:ttl))
+        ON CONFLICT (key) DO UPDATE
+        SET value = :value,
+            ttl = sec2ttl(:ttl);
         """
         value = json.dumps(value)
         with self.client.connect() as conn: