ability to create string mongo IDs when importing

plugins/dbgate-plugin-mongo/src/backend/createBulkInsertStream.js

@@ -1,3 +1,5 @@
+const ObjectId = require('mongodb').ObjectId;
+
 function createBulkInsertStream(driver, stream, pool, name, options) {
   const collectionName = name.pureName;
   const db = pool.__getDatabase();
@@ -19,11 +21,17 @@ function createBulkInsertStream(driver, stream, pool, name, options) {
       )
         return;
     }
+    if (options.createStringId) {
+      row = {
+        _id: new ObjectId().toString(),
+        ...row,
+      }
+    }
     writable.buffer.push(row);
   };
 
   writable.checkStructure = async () => {
-    if (options.dropIfExists || options.truncate) {
+    if (options.dropIfExists) {
       console.log(`Dropping collection ${collectionName}`);
       await db.collection(collectionName).drop();
     }

plugins/dbgate-plugin-mongo/src/backend/driver.js

@@ -59,7 +59,9 @@ const driver = {
       ? `mongodb://${user}:${password}@${server}:${port}`
       : `mongodb://${server}:${port}`;
 
-    const options = {};
+    const options = {
+      useUnifiedTopology: true,
+    };
     if (ssl) {
       options.tls = true;
       options.tlsCAFile = ssl.ca;

plugins/dbgate-plugin-mongo/src/frontend/driver.js

@@ -44,6 +44,16 @@ const driver = {
     return ['server', 'port', 'user', 'password', 'defaultDatabase', 'singleDatabase'].includes(field);
   },
 
+  importExportArgs: [
+    {
+      type: 'checkbox',
+      name: 'createStringId',
+      label: 'Create string _id attribute',
+      apiName: 'createStringId',
+      direction: 'target',
+    },
+  ],
+
   getCollectionUpdateScript(changeSet) {
     let res = '';
     for (const insert of changeSet.inserts) {