diff --git a/.gitignore b/.gitignore
index 387fbac..ab376d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,5 @@ package-lock.json
 .vscode
 node_modules
 build
-yarn.lock
\ No newline at end of file
+yarn.lock
+.DS_Store
diff --git a/demo/test.js b/demo/test.js
index a0ca08c..6f9bc68 100644
--- a/demo/test.js
+++ b/demo/test.js
@@ -8,22 +8,15 @@ invodb.database('zzz.invodb')
 let col = invodb.colection('blog')
 if(!col.exist()) col.create();
 
-for(let json of col.query({})) col.remove(json)
+// for(let json of col.query({})) col.remove(json)
 
-let list = fs.readFileSync(__dirname + "/list.txt").toString().split("\n")
-for(let json of list) {
-    col.insert(JSON.parse(json))
-}
+// let list = fs.readFileSync(__dirname + "/list.txt").toString().split("\n")
+// for(let json of list) {
+//     col.insert(JSON.parse(json))
+// }
 
 let result = col.query({
-    id: {
-        $gte: 1,
-        $lte: 8,
-        $or: [
-            { $ne: 2 },
-            { $ne: 3 }
-        ]
-    }
+    __INVO_ID__: 'oev3yzmydgdvtxg82zbzmrl6gbu73ax7'
 })
 
 console.log(">>>>>>>>>>>>>>>>>>>>")
diff --git a/docs/invodb使用文档.md b/docs/invodb使用文档.md
new file mode 100644
index 0000000..dd08c1d
--- /dev/null
+++ b/docs/invodb使用文档.md
@@ -0,0 +1,32 @@
+# 简明 invoDB 使用教程
+
+
+## 前置知识
+
+### 什么是 JSON 格式
+
+是一种轻量级资料交换格式，其内容由属性和值所组成。
+
+`json` 可以同样被看作 `JavaScript` 对象的一个子集。
+
+#### 一个典型的 JSON 对象
+
+```json
+{
+  "id": 7,
+  "title": "这是一篇文章",
+  "content": "这是文章内容",
+  "author": "YuhangQ",
+  "category": "数据库",
+  "tags": ["数据库", "C++", "数据结构"],
+  "parameters": {
+    "hidden": true,
+    "like": 25565,
+  },
+  "comment": [
+    {"username": "YuhangQ", "content": "文章写的真不错！"},
+    {"username": "TechCiel", "content": "能提供下打赏渠道吗？"},
+  ]
+}
+```
+
diff --git a/package.json b/package.json
index e2b4114..21897a8 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
   "main": "index.js",
   "scripts": {
     "test": "clear && node-gyp build && node demo/test.js",
-    "install": "node-gyp rebuild"
+    "install": "node-gyp rebuild",
+    "build": "node-gyp build"
   },
   "repository": {
     "type": "git",
diff --git a/src/collection/query.cpp b/src/collection/query.cpp
index 02a9631..c61d231 100644
--- a/src/collection/query.cpp
+++ b/src/collection/query.cpp
@@ -228,7 +228,13 @@ std::set<nlohmann::json> Collection::innerQuery(const std::string &prefix, const
         std::set<nlohmann::json> tmp;
         std::string tPrefix = prefix + key;
 
-        if(key == "$or") {
+        if(key == "__INVO_ID__") {
+            int add = uuid->find(value);
+            if(add != -1) {
+                tmp.insert(PageManager::readJSONFromFile(add));
+            }
+        }
+        else if(key == "$or") {
             nlohmann::json line = json[key].get<nlohmann::json>();
             for(auto& obj : line) {
                 tmp = setUnion(tmp, innerQuery(prefix, obj.get<nlohmann::json>()));
diff --git a/src/test/test.h b/src/test/test.h
index 987b47f..6a0f725 100644
--- a/src/test/test.h
+++ b/src/test/test.h
@@ -8,6 +8,14 @@
 Collection *col;
 
 void terminal() {
+
+    PageManager::loadDatabase("test.invodb");
+    Collection::loadCollections();
+
+    if (!Collection::existsCollection("test"))
+        Collection::createCollection("test");
+    col = &Collection::getCollection("test");
+
     printf("--------INVODB TERMINAL--------\n");
     printf("insert\t<JSON>\tinsert a one line json to database.\n");
     printf("query\t<JSON>\tquery all jsons satisfying the query json.\n");