refactor(editor): extract database block (#9435)

Part of: [BS-2269](https://linear.app/affine-design/issue/BS-2269/%E8%BF%81%E7%A7%BB-database-block-%E5%88%B0-affine-%E6%96%87%E4%BB%B6%E5%A4%B9%E4%B8%8B%E5%B9%B6%E5%BC%80%E5%90%AF-nouncheckedindexedaccess)

blocksuite/affine/block-database/src/commands.ts

@@ -0,0 +1,41 @@
+import type { BlockCommands, Command } from '@blocksuite/block-std';
+
+export const insertDatabaseBlockCommand: Command<
+  'selectedModels',
+  'insertedDatabaseBlockId',
+  {
+    viewType: string;
+    place?: 'after' | 'before';
+    removeEmptyLine?: boolean;
+  }
+> = (ctx, next) => {
+  const { selectedModels, viewType, place, removeEmptyLine, std } = ctx;
+  if (!selectedModels?.length) return;
+
+  const targetModel =
+    place === 'before'
+      ? selectedModels[0]
+      : selectedModels[selectedModels.length - 1];
+
+  const service = std.getService('affine:database');
+  if (!service) return;
+
+  const result = std.doc.addSiblingBlocks(
+    targetModel,
+    [{ flavour: 'affine:database' }],
+    place
+  );
+  if (result.length === 0) return;
+
+  service.initDatabaseBlock(std.doc, targetModel, result[0], viewType, false);
+
+  if (removeEmptyLine && targetModel.text?.length === 0) {
+    std.doc.deleteBlock(targetModel);
+  }
+
+  next({ insertedDatabaseBlockId: result[0] });
+};
+
+export const commands: BlockCommands = {
+  insertDatabaseBlock: insertDatabaseBlockCommand,
+};