Add C++ sdk-test try_update parity

Author: clockwork-labs-bot

modules/sdk-test-cpp/src/lib.cpp

@@ -589,6 +589,12 @@ SPACETIMEDB_STRUCT(PkSimpleEnum, a, data)
 SPACETIMEDB_TABLE(PkSimpleEnum, pk_simple_enum, Public)
 FIELD_PrimaryKey(pk_simple_enum, a);
 
+struct PkTryUpdateUniqueConflict { uint32_t id; uint32_t unique_value; int32_t data; };
+SPACETIMEDB_STRUCT(PkTryUpdateUniqueConflict, id, unique_value, data)
+SPACETIMEDB_TABLE(PkTryUpdateUniqueConflict, pk_try_update_unique_conflict, Public)
+FIELD_PrimaryKey(pk_try_update_unique_conflict, id);
+FIELD_Unique(pk_try_update_unique_conflict, unique_value);
+
 // =============================================================================
 // ADDITIONAL SPECIALIZED TABLES
 // =============================================================================
@@ -1327,6 +1333,31 @@ SPACETIMEDB_REDUCER(insert_pk_simple_enum, ReducerContext ctx, SimpleEnum a, int
     return Ok();
 }
 
+SPACETIMEDB_REDUCER(insert_pk_try_update_unique_conflict, ReducerContext ctx, uint32_t id, uint32_t unique_value, int32_t data)
+{
+    ctx.db[pk_try_update_unique_conflict].insert(PkTryUpdateUniqueConflict{id, unique_value, data});
+    return Ok();
+}
+
+SPACETIMEDB_REDUCER(try_update_pk_try_update_unique_conflict, ReducerContext ctx, uint32_t id, uint32_t unique_value, int32_t data)
+{
+    auto existing = ctx.db[pk_try_update_unique_conflict_id].find(id);
+    if (!existing.has_value()) {
+        return Err("row not found");
+    }
+
+    auto conflicting = ctx.db[pk_try_update_unique_conflict_unique_value].find(unique_value);
+    if (conflicting.has_value() && conflicting->id != id) {
+        return Err("unique constraint violation");
+    }
+
+    if (!ctx.db[pk_try_update_unique_conflict_id].update(PkTryUpdateUniqueConflict{id, unique_value, data})) {
+        return Err("update failed");
+    }
+
+    return Ok();
+}
+
 // =============================================================================
 // DELETE OPERATIONS - PRIMARY KEY
 // =============================================================================