Updated APIv5 Query API (markdown)

APIv5-Query-API.md

@@ -95,4 +95,34 @@ done.get(); // (Optional) Block thread until transaction was executed
 `execute` does not block the thread, because the SQL is executed on another thread concurrently.
 If you would like to wait for the statement to execute you can call `Future#get()` to block the thread.
 
-**Do not call `Future#get()` inside `execute` - This might deadlock the whole database due to blocked transaction thread!**
+**Do not call `Future#get()` inside `execute` - This might deadlock the whole database due to blocked transaction thread!**
+
+<details>
+<summary>Example of update - insert if not exist procedure</summary>
+
+```
+    public void storeProtocolVersion(UUID uuid, int version) throws ExecutionException {
+        String update = "UPDATE plan_version_protocol SET protocol_version=? WHERE uuid=?";
+        String insert = "INSERT INTO plan_version_protocol (protocol_version, uuid) VALUES (?, ?)";
+        
+        AtomicBoolean updated = new AtomicBoolean(false);
+        try {
+            queryService.execute(update, statement -> {
+                statement.setInt(1, version);
+                statement.setString(2, uuid.toString());
+                updated.set(statement.execute());
+            }).get(); // Wait
+            if (!updated.get()) {
+                queryService.execute(insert, statement -> {
+                    statement.setInt(1, version);
+                    statement.setString(2, uuid.toString());
+                    statement.execute();
+                });
+            }
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+```
+
+</details>