Initial project

apps/im_app/lib/data/local/drift/app_database.dart

@@ -0,0 +1,40 @@
+import 'package:drift/drift.dart';
+import 'package:im_app/data/local/drift/tables/users.dart';
+
+part 'app_database.g.dart';
+
+@DriftDatabase(tables: [Users])
+class AppDatabase extends _$AppDatabase {
+  AppDatabase(super.e);
+
+  @override
+  int get schemaVersion => 1;
+
+  @override
+  MigrationStrategy get migration {
+    return MigrationStrategy(
+      onCreate: (m) async {
+        await m.createAll();
+      },
+      onUpgrade: (m, from, to) async {
+        // 自动检测并添加缺失列
+        for (final table in allTables) {
+          //取原来的字段
+          final existingColumns = await m.database
+              .customSelect('PRAGMA table_info(${table.actualTableName})')
+              .get();
+          final existingNames = existingColumns
+              .map((r) => r.data['name'] as String)
+              .toSet();
+
+          for (final column in table.$columns) {
+            if (!existingNames.contains(column.name)) {
+              //字段缺失，添加。
+              await m.addColumn(table, column);
+            }
+          }
+        }
+      },
+    );
+  }
+}