Magazine — Windev

// In the WebDev project initialization (Server code) HDescribeReplication("CloudDB", "CUSTOMER", "Replication_ON_PREMISE") HReplicationCreate("CloudDB", "CUSTOMER", "Product_Table", "127.0.0.1", "MasterDB") HFSQL replication uses delta packets. It is 1,000x faster than CSV exports. Only new/modified records travel over the wire. 4. Step 2: The Real-Time Transaction Queue (The "Transactional" Lane) For high-write data (Orders, Inventory Movements), replication can cause conflicts. Use an Outbox pattern .

// Return success ResponseWriteStatus(201, "OK") ResponseWriteJSON("{""result"": ""accepted""}") END What about data created on the Mobile app? You need a "Pull" mechanism. Use WebDev Scheduler to trigger a download.

The challenge is not building the apps; it is . You cannot expose your on-premise HFSQL directly to the internet, and batch imports/exports are too slow for real-time inventory. 2. The Architecture: The "Reversé" Proxy Pattern Instead of the cloud pulling data from the premise (which requires opening firewall ports), we will use the premise pushing data to the cloud via secure REST APIs. We will also use HFSQL Native Replication for the read-only data. windev magazine

// Inside the "Save" button of an Order window HAdd(Outbox_Table, "TYPE", "ORDER_CREATED") HAdd(Outbox_Table, "PAYLOAD", JSONBuild(Order_Record)) HAdd(Outbox_Table, "STATUS", "PENDING") // Commit the local transaction immediately HTransactionEnd(Global_DB, hCommit)

When a user validates an order, do not call the API directly (network failures would block the user). Write to a local Outbox table first. // In the WebDev project initialization (Server code)

HAdd(Cloud_Order)

Optimizing Real-Time Data Synchronization for Hybrid Cloud/On-Premise Applications // Return success ResponseWriteStatus(201

This architecture respects the network boundaries: the cloud never touches your firewall, and the premise never blocks the user for network errors.