project init

README.md

 # skill_tree_pg
 
-PostgreSQL 技能树
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+本项目是 [CSDN 技能树](https://codechina.csdn.net/explore/topics/skill_tree) 的 PostgreSQL 专项。
+
+本仓库面向学习者，以树状结构管理 PostgreSQL 技能的知识点。
+
+为了操作方便，在仓库中有一组微型的 Python 工具脚本，用于加工和维护技能树，一般情况下不用关注。对于项目贡献者，
+主要维护的是技能树的目录结构和相关习题
+
+
+## 目录结构说明
+
+* 技能树`骨架文件`：
+    * 位置：`data/tree.json`
+    * 说明：该文件是执行 `python main.py` 生成的，请勿人工编辑
+* 技能树`根节点`配置文件：
+    * 位置：`data/config.json`
+    * 说明：可编辑配置关键词等字段，其中 `node_id` 字段是生成的，请勿编辑
+* 技能树`难度节点`：
+    * 位置：`data/xxx`，例如: `data/1.PostgreSQL初阶`
+    * 说明：
+        * 每个技能树有 3 个等级，目录前的序号是必要的，用来保持文件夹目录的顺序
+        * 每个目录下有一个 `config.json` 可配置关键词信息，其中 `node_id` 字段是生成的，请勿编辑
+* 技能树`章节点`：
+    * 位置：`data/xxx/xxx`，例如：`data/1.PostgreSQL初阶/1.快速入门`
+    * 说明：
+        * 每个技能树的每个难度等级有 n 个章节，目录前的序号是必要的，用来保持文件夹目录的顺序
+        * 每个目录下有一个 `config.json` 可配置关键词信息，其中 `node_id` 字段是生成的，请勿编辑
+* 技能树`知识节点`：
+    * 位置：`data/xxx/xxx/xxx`，例如：`data/1.PostgreSQL初阶/1.快速入门/1.安装OBD`
+    * 说明：
+        * 每个技能树的每章有 `n` 个知识节点，目录前的序号是必要的，用来保持文件夹目录的顺序
+        * 每个目录下有一个 `config.json`
+            * 其中 `node_id` 字段是生成的，请勿编辑
+            * 其中 `keywords` 可配置关键字字段
+            * 其中 `children` 可配置该`知识节点`下的子树结构信息，参考后面描述
+            * 其中 `export` 可配置该`知识节点`下的导出习题信息，参考后面描述
+
+
+## `知识节点` 子树信息结构
+
+举例，如果在 `data/1.PostgreSQL初阶/7.查询数据/config.json` 里配置对该知识节点子树信息结构：
+```json
+{
+    "children": [
+        "输入输出",
+        "访问工具",
+        "查询的基本要素"
+    ]
+}
+```
+
+在后续的信息加工过程中，这些内容就会关联到相关的节点。
+
+通常情况下，我们只需要维护固定深度的目录结构，大部分知识点不涉及 children 的维护。
+
+## `知识节点` 的导出习题编辑
+
+例如 `data/1.PostgreSQL初阶/7.查询数据/config.json` 里配置对该知识节点导出的习题
+
+```json
+{
+    "export": [
+        "hello.json"
+    ]
+}
+```
+
+每个文件名，指向对应的习题定义 json 。
+
+## `知识节点` 的导出习题选项配置编辑
+
+首先，我们添加前文中 export 指定的习题配置，例如在 `data/1.PostgreSQL初阶/7.查询数据` 下增加一个`hello.json`代码：
+
+```json
+{
+    "type": "code_options",
+    "author": "刘鑫",
+    "source": "hello.md",
+    "exercise_id":"1190bb7834904da0b1f20915960714d5",
+    "notebook_enable": false
+}
+```
+其中 type 字段目前都固定是 `code_options`。exercise_id 可以不写，处理程序会自动填补这个数据。notebook_enable对于 PG 技能树总是false。
+根据具体情况写好其它 字段，注意这里 source 的文件名，我们指定了一个 markdwon 文件。现在我们新建一个 HelloWorld.md 并编辑为：
+
+````markdown
+# Hello World
+
+
+以下 `Hello World` 程序中，能够正确输出`hello`的是：
+
+## 答案
+
+```sql
+
+select 'hello';
+```
+
+## 选项
+
+### A
+
+```sql
+print 'hello';
+```
+
+### B
+
+```sql
+echo 'hello';
+```
+
+### C
+
+```sql
+log 'hello';
+```
+
+````
+
+这是一个最基本的习题结构，它包含标题、答案、选项，注意这几个一级和二级标题必须填写正确，解释器会读取这几个标题。而选项的标题会被直接忽略掉，在最终生成的习题中不包含选项的三级标题，所以这个标题可以用来标注一些编辑信息，例如“此选项没有关闭文件连接”，“类型错误”等等。
+
+
+## 技能树合成
+
+在`src`目录下执行 `python main.py -a tree` 会合成技能树文件，合成的技能树文件: `data/tree.json`
+* 合成过程中，会自动检查每个目录下 `config.json` 里的 `node_id` 是否存在，不存在则生成
+* 合成过程中，会自动检查每个知识点目录下 `config.json` 里的 `export` 里导出的习题配置，检查是否存在`exercise_id` 字段，如果不存在则生成

data/1.PostgreSQL初阶/1.PostgreSQL基本概念/1.关系型数据库/config.json

+{
+  "node_id": "pg-6920a4f2ba864459bd8883a7a48fa238",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
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data/1.PostgreSQL初阶/1.PostgreSQL基本概念/2.服务器和客户端/config.json

+{
+  "node_id": "pg-40374311856c4ad3b76fff16ecbe9dce",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
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data/1.PostgreSQL初阶/1.PostgreSQL基本概念/config.json

+{
+  "node_id": "pg-b710bd5c63fb4651bebfdd9b3fdb17a5",
+  "keywords": []
+}
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data/1.PostgreSQL初阶/2.PostgreSQL的安装/1.安装PostgreSQL/config.json

+{
+  "node_id": "pg-940afa6d71af44f689011ded8fd91a98",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
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data/1.PostgreSQL初阶/2.PostgreSQL的安装/2.登录PostgreSQL/config.json

+{
+  "node_id": "pg-586916fe52e245efb399ae862378f87f",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
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data/1.PostgreSQL初阶/2.PostgreSQL的安装/3.使用PostgreSQL/config.json

+{
+  "node_id": "pg-c252ff4b0e7f4163837c9b6f81678505",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.PostgreSQL初阶/2.PostgreSQL的安装/config.json

+{
+  "node_id": "pg-3ac4a2bf31af423fb9e2ec9fe30024c5",
+  "keywords": []
+}
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data/1.PostgreSQL初阶/3.查询数据/1.SQL基本语法/config.json

+{
+  "node_id": "pg-dca8da7637f94ded91a1871daa51746e",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
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data/1.PostgreSQL初阶/3.查询数据/2.SQL、DML和DDL/config.json

+{
+  "node_id": "pg-b0f366abe12e41b0a9672d317e556662",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.PostgreSQL初阶/3.查询数据/3.PostgreSQL的数据类型/config.json

+{
+  "node_id": "pg-1eae8a80615f436081e71b36d89fb0aa",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.PostgreSQL初阶/3.查询数据/4.函数调用/config.json

+{
+  "node_id": "pg-ebef9fceb3684b119a9ba221a81f304b",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/1.PostgreSQL初阶/3.查询数据/config.json

+{
+  "node_id": "pg-7e2e52dbddb44d5bad6deea6c5e57198",
+  "keywords": []
+}
\ No newline at end of file

data/1.PostgreSQL初阶/config.json

+{
+  "node_id": "pg-6089aef54c4c4ce7bc85b4dfa14f44cd",
+  "keywords": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/1.PostgreSQL数据库的基本结构/1.表/config.json

+{
+  "node_id": "pg-806d3976e8764d4f8e26c197c53d45a8",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/1.PostgreSQL数据库的基本结构/2.函数/config.json

+{
+  "node_id": "pg-f371b91ef63a4ce08f80b92bc8580196",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/1.PostgreSQL数据库的基本结构/3.用户和权限/config.json

+{
+  "node_id": "pg-cb942198b3a84d5398d73d558a241543",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/1.PostgreSQL数据库的基本结构/4.索引和约束/config.json

+{
+  "node_id": "pg-eeb777ca54434480a06bfe7fc5e7d3ca",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/1.PostgreSQL数据库的基本结构/5. 触发器/config.json

+{
+  "node_id": "pg-a0cb78d68d814f5e935b41922b88e085",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/1.PostgreSQL数据库的基本结构/6.数据库扩展/config.json

+{
+  "node_id": "pg-d2b6e840cfad44a2aa357cfee56d437d",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/1.PostgreSQL数据库的基本结构/config.json

+{
+  "node_id": "pg-100e256ddb2e43ea8d68558e73522819",
+  "keywords": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/1.聚合和分组/config.json

+{
+  "node_id": "pg-3a87b0dbead643e58f1ff1d93acd80cc",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/2.连接查询/config.json

+{
+  "node_id": "pg-458d5d590ea64188847b45d8e6343f83",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/3.子查询/config.json

+{
+  "node_id": "pg-55fd213f919d411c9b572241c4bb7807",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/4.分页查询/config.json

+{
+  "node_id": "pg-69d3a1c646004e1da497fed2af57806c",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/5.CTE/config.json

+{
+  "node_id": "pg-6beb084543204f4f9d87930c0a6c5707",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/6.DML/config.json

+{
+  "node_id": "pg-e1cd59819dd74a0bacc707f7863aad53",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/7.过程化编程/config.json

+{
+  "node_id": "pg-eb4048b7dfd3469f8049330ba78427b5",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/8.DDL/config.json

+{
+  "node_id": "pg-0378bcd60ccd4dfebcfead92abbdd673",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/2.服务端编程/config.json

+{
+  "node_id": "pg-c99d8673d47444988c37f6dd3abb1e63",
+  "keywords": []
+}
\ No newline at end of file

data/2.PostgreSQL中阶/config.json

+{
+  "node_id": "pg-c360138dad92431594130596c5c91394",
+  "keywords": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/1.集群和复制/1.standby/config.json

+{
+  "node_id": "pg-58e924e93b564a24abb1e6b9cdfbc094",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/1.集群和复制/2.流式复制集群/config.json

+{
+  "node_id": "pg-7eff3dcf68644c23bd89f2a2abe4fac6",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/1.集群和复制/3.fdw/config.json

+{
+  "node_id": "pg-20a433f6ae65429f9b1a7f17c751ac01",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/1.集群和复制/config.json

+{
+  "node_id": "pg-328b09c201b6414d83228970591910af",
+  "keywords": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/2.高级数据类型/1.自定义类型/config.json

+{
+  "node_id": "pg-ec4bbb39e76949b48b13f04cc8c16532",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/2.高级数据类型/2.几何类型和GIS/config.json

+{
+  "node_id": "pg-3bbe12c0a19d4cb7a61dc0a20624ed89",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/2.高级数据类型/3.JSON和JSONB/config.json

+{
+  "node_id": "pg-69ad784e39c044d7a115cfd124e49ef1",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/2.高级数据类型/4.函数/config.json

+{
+  "node_id": "pg-6dbbb44b41d347b58075a9155dfb8356",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/2.高级数据类型/5.视图/config.json

+{
+  "node_id": "pg-532f8f84ea74493a9581e6bf720ebf78",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/2.高级数据类型/config.json

+{
+  "node_id": "pg-f80410c703044bfea61b2f3a4fbc5705",
+  "keywords": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/3.SQL高级技巧/1.递归查询/config.json

+{
+  "node_id": "pg-2e691ed3a847424eb887b40aca750c4e",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/3.SQL高级技巧/2.写入和冲突/config.json

+{
+  "node_id": "pg-6ce3520f7a67494a90378e7b194f8720",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/3.SQL高级技巧/3.事务/config.json

+{
+  "node_id": "pg-2d547e778fc4453b84feb0a0c6341348",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/3.SQL高级技巧/4.索引和优化/config.json

+{
+  "node_id": "pg-79fe660f35f4469481db38509343c2b7",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/3.SQL高级技巧/5.表函数/config.json

+{
+  "node_id": "pg-e4b00736ab4c483785c022a0a464f30a",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/3.SQL高级技巧/6.结果集类型/config.json

+{
+  "node_id": "pg-0e280b203b524a28ab8587aac125a865",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/3.SQL高级技巧/config.json

+{
+  "node_id": "pg-9e66230caa834cb99a2390c7f71fb582",
+  "keywords": []
+}
\ No newline at end of file

data/3.PostgreSQL高阶/config.json

+{
+  "node_id": "pg-2f46da8212cf41ad9c0d2a5bf1330adc",
+  "keywords": []
+}
\ No newline at end of file

data/config.json

+{
+  "tree_name": "pg",
+  "keywords": [],
+  "node_id": "pg-4544619de2a54841930282c700ba92b8"
+}
\ No newline at end of file

data/tree.json

+{
+  "pg": {
+    "node_id": "pg-4544619de2a54841930282c700ba92b8",
+    "keywords": [],
+    "children": [
+      {
+        "PostgreSQL初阶": {
+          "node_id": "pg-6089aef54c4c4ce7bc85b4dfa14f44cd",
+          "keywords": [],
+          "children": [
+            {
+              "PostgreSQL基本概念": {
+                "node_id": "pg-b710bd5c63fb4651bebfdd9b3fdb17a5",
+                "keywords": [],
+                "children": [
+                  {
+                    "关系型数据库": {
+                      "node_id": "pg-6920a4f2ba864459bd8883a7a48fa238",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "服务器和客户端": {
+                      "node_id": "pg-40374311856c4ad3b76fff16ecbe9dce",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            },
+            {
+              "PostgreSQL的安装": {
+                "node_id": "pg-3ac4a2bf31af423fb9e2ec9fe30024c5",
+                "keywords": [],
+                "children": [
+                  {
+                    "安装PostgreSQL": {
+                      "node_id": "pg-940afa6d71af44f689011ded8fd91a98",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "登录PostgreSQL": {
+                      "node_id": "pg-586916fe52e245efb399ae862378f87f",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "使用PostgreSQL": {
+                      "node_id": "pg-c252ff4b0e7f4163837c9b6f81678505",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            },
+            {
+              "查询数据": {
+                "node_id": "pg-7e2e52dbddb44d5bad6deea6c5e57198",
+                "keywords": [],
+                "children": [
+                  {
+                    "SQL基本语法": {
+                      "node_id": "pg-dca8da7637f94ded91a1871daa51746e",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "SQL、DML和DDL": {
+                      "node_id": "pg-b0f366abe12e41b0a9672d317e556662",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "PostgreSQL的数据类型": {
+                      "node_id": "pg-1eae8a80615f436081e71b36d89fb0aa",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "函数调用": {
+                      "node_id": "pg-ebef9fceb3684b119a9ba221a81f304b",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            }
+          ]
+        }
+      },
+      {
+        "PostgreSQL中阶": {
+          "node_id": "pg-c360138dad92431594130596c5c91394",
+          "keywords": [],
+          "children": [
+            {
+              "PostgreSQL数据库的基本结构": {
+                "node_id": "pg-100e256ddb2e43ea8d68558e73522819",
+                "keywords": [],
+                "children": [
+                  {
+                    "表": {
+                      "node_id": "pg-806d3976e8764d4f8e26c197c53d45a8",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "函数": {
+                      "node_id": "pg-f371b91ef63a4ce08f80b92bc8580196",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "用户和权限": {
+                      "node_id": "pg-cb942198b3a84d5398d73d558a241543",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "索引和约束": {
+                      "node_id": "pg-eeb777ca54434480a06bfe7fc5e7d3ca",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    " 触发器": {
+                      "node_id": "pg-a0cb78d68d814f5e935b41922b88e085",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "数据库扩展": {
+                      "node_id": "pg-d2b6e840cfad44a2aa357cfee56d437d",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            },
+            {
+              "服务端编程": {
+                "node_id": "pg-c99d8673d47444988c37f6dd3abb1e63",
+                "keywords": [],
+                "children": [
+                  {
+                    "聚合和分组": {
+                      "node_id": "pg-3a87b0dbead643e58f1ff1d93acd80cc",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "连接查询": {
+                      "node_id": "pg-458d5d590ea64188847b45d8e6343f83",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "子查询": {
+                      "node_id": "pg-55fd213f919d411c9b572241c4bb7807",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "分页查询": {
+                      "node_id": "pg-69d3a1c646004e1da497fed2af57806c",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "CTE": {
+                      "node_id": "pg-6beb084543204f4f9d87930c0a6c5707",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "DML": {
+                      "node_id": "pg-e1cd59819dd74a0bacc707f7863aad53",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "过程化编程": {
+                      "node_id": "pg-eb4048b7dfd3469f8049330ba78427b5",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "DDL": {
+                      "node_id": "pg-0378bcd60ccd4dfebcfead92abbdd673",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            }
+          ]
+        }
+      },
+      {
+        "PostgreSQL高阶": {
+          "node_id": "pg-2f46da8212cf41ad9c0d2a5bf1330adc",
+          "keywords": [],
+          "children": [
+            {
+              "集群和复制": {
+                "node_id": "pg-328b09c201b6414d83228970591910af",
+                "keywords": [],
+                "children": [
+                  {
+                    "standby": {
+                      "node_id": "pg-58e924e93b564a24abb1e6b9cdfbc094",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "流式复制集群": {
+                      "node_id": "pg-7eff3dcf68644c23bd89f2a2abe4fac6",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "fdw": {
+                      "node_id": "pg-20a433f6ae65429f9b1a7f17c751ac01",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            },
+            {
+              "高级数据类型": {
+                "node_id": "pg-f80410c703044bfea61b2f3a4fbc5705",
+                "keywords": [],
+                "children": [
+                  {
+                    "自定义类型": {
+                      "node_id": "pg-ec4bbb39e76949b48b13f04cc8c16532",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "几何类型和GIS": {
+                      "node_id": "pg-3bbe12c0a19d4cb7a61dc0a20624ed89",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "JSON和JSONB": {
+                      "node_id": "pg-69ad784e39c044d7a115cfd124e49ef1",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "函数": {
+                      "node_id": "pg-6dbbb44b41d347b58075a9155dfb8356",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "视图": {
+                      "node_id": "pg-532f8f84ea74493a9581e6bf720ebf78",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            },
+            {
+              "SQL高级技巧": {
+                "node_id": "pg-9e66230caa834cb99a2390c7f71fb582",
+                "keywords": [],
+                "children": [
+                  {
+                    "递归查询": {
+                      "node_id": "pg-2e691ed3a847424eb887b40aca750c4e",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "写入和冲突": {
+                      "node_id": "pg-6ce3520f7a67494a90378e7b194f8720",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "事务": {
+                      "node_id": "pg-2d547e778fc4453b84feb0a0c6341348",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "索引和优化": {
+                      "node_id": "pg-79fe660f35f4469481db38509343c2b7",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "表函数": {
+                      "node_id": "pg-e4b00736ab4c483785c022a0a464f30a",
+                      "keywords": [],
+                      "children": []
+                    }
+                  },
+                  {
+                    "结果集类型": {
+                      "node_id": "pg-0e280b203b524a28ab8587aac125a865",
+                      "keywords": [],
+                      "children": []
+                    }
+                  }
+                ]
+              }
+            }
+          ]
+        }
+      }
+    ]
+  }
+}
\ No newline at end of file

main.py

+from src.tree import TreeWalker
+
+if __name__ == '__main__':
+    walker = TreeWalker("data", "pg", "PostgreSQL")
+    walker.walk()

src/tree.py

+import logging
+from genericpath import exists
+import json
+import os
+import uuid
+import sys
+import re
+
+id_set = set()
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.INFO)
+handler = logging.StreamHandler(sys.stdout)
+formatter = logging.Formatter('%(asctime)s - %(levelname)s - %(message)s')
+handler.setFormatter(formatter)
+logger.addHandler(handler)
+
+def load_json(p):
+    with open(p, 'r') as f:
+        return json.loads(f.read())
+
+
+def dump_json(p, j, exist_ok=False, override=False):
+    if os.path.exists(p):
+        if exist_ok:
+            if not override:
+                return
+        else:
+            logger.error(f"{p} already exist")
+            sys.exit(0)
+
+    with open(p, 'w+') as f:
+        f.write(json.dumps(j, indent=2, ensure_ascii=False))
+
+
+def ensure_config(path):
+    config_path = os.path.join(path, "config.json")
+    if not os.path.exists(config_path):
+        node = {"keywords": []}
+        dump_json(config_path, node, exist_ok=True, override=False)
+        return node
+    else:
+        return load_json(config_path)
+
+
+def parse_no_name(d):
+    p = r'(\d+)\.(.*)'
+    m = re.search(p, d)
+
+    try:
+        no = int(m.group(1))
+        dir_name = m.group(2)
+    except:
+        sys.exit(0)
+
+    return no, dir_name
+
+
+def check_export(base, cfg):
+    flag = False
+    exports = []
+    for export in cfg.get('export', []):
+        ecfg_path = os.path.join(base, export)
+        if os.path.exists(ecfg_path):
+            exports.append(export)
+        else:
+            flag = True
+    if flag:
+        cfg["export"] = exports
+    return flag
+
+
+def gen_node_id():
+    return "oceanbase-" + uuid.uuid4().hex
+
+
+class TreeWalker:
+    def __init__(self, root, tree_name, title=None, log=None):
+        self.name = tree_name
+        self.root = root
+        self.title = tree_name if title is None else title
+        self.tree = {}
+        self.logger = logger if log is None else log
+
+    def walk(self):
+        root = self.load_root()
+        root_node = {
+            "node_id": root["node_id"],
+            "keywords": root["keywords"],
+            "children": []
+        }
+        self.tree[root["tree_name"]] = root_node
+        self.load_levels(root_node)
+        self.load_chapters(self.root, root_node)
+        for index, level in enumerate(root_node["children"]):
+            level_title = list(level.keys())[0]
+            level_node = list(level.values())[0]
+            level_path = os.path.join(self.root, f"{index+1}.{level_title}")
+            self.load_chapters(level_path, level_node)
+            for index, chapter in enumerate(level_node["children"]):
+                chapter_title = list(chapter.keys())[0]
+                chapter_node = list(chapter.values())[0]
+                chapter_path = os.path.join(level_path, f"{index+1}.{chapter_title}")
+                self.load_sections(chapter_path, chapter_node)
+                for index, section_node in enumerate(chapter_node["children"]):
+                    section_title = list(section_node.keys())[0]
+                    full_path = os.path.join(chapter_path, f"{index}.{section_title}")
+                    if os.path.isdir(full_path):
+                        self.ensure_exercises(full_path)
+
+        tree_path = os.path.join(self.root, "tree.json")
+        dump_json(tree_path, self.tree, exist_ok=True, override=True)
+        return self.tree
+
+    def load_levels(self, root_node):
+        levels = []
+        for level in os.listdir(self.root):
+            if not os.path.isdir(level):
+                continue
+            level_path = os.path.join(self.root, level)
+            num, config = self.load_level_node(level_path)
+            levels.append((num, config))
+
+        levels = self.resort_children(self.root, levels)
+        root_node["children"] = [item[1] for item in levels]
+        return root_node
+
+    def load_level_node(self, level_path):
+        config = self.ensure_level_config(level_path)
+        num, name = self.extract_node_env(level_path)
+
+        result = {
+            name: {
+                "node_id": config["node_id"],
+                "keywords": config["keywords"],
+                "children": [],
+            }
+        }
+
+        return num, result
+
+    def load_chapters(self, base, level_node):
+        chapters = []
+        for name in os.listdir(base):
+            full_name = os.path.join(base, name)
+            if os.path.isdir(full_name):
+                num, chapter = self.load_chapter_node(full_name)
+                chapters.append((num, chapter))
+
+        chapters = self.resort_children(base, chapters)
+        level_node["children"] = [item[1] for item in chapters]
+        return level_node
+
+    def load_sections(self, base, chapter_node):
+        sections = []
+        for name in os.listdir(base):
+            full_name = os.path.join(base, name)
+            if os.path.isdir(full_name):
+                num, section = self.load_section_node(full_name)
+                sections.append((num, section))
+
+        sections = self.resort_children(base, sections)
+        chapter_node["children"] = [item[1] for item in sections]
+        return chapter_node
+
+    def resort_children(self, base, children):
+        children.sort(key=lambda item: item[0])
+        for index, [number, element] in enumerate(children):
+            title = list(element.keys())[0]
+            origin = os.path.join(base, f"{number}.{title}")
+            posted = os.path.join(base, f"{index+1}.{title}")
+            if origin != posted:
+                self.logger.info(f"rename [{origin}] to [{posted}]")
+            os.rename(origin, posted)
+        return children
+
+    def ensure_chapters(self):
+        for subdir in os.listdir(self.root):
+            self.ensure_level_config(subdir)
+
+    def load_root(self):
+        config_path = os.path.join(self.root, "config.json")
+        if not os.path.exists(config_path):
+            config = {
+                "tree_name": self.name,
+                "keywords": [],
+                "node_id": self.gen_node_id(),
+            }
+            dump_json(config_path, config, exist_ok=True, override=True)
+        else:
+            config = load_json(config_path)
+            flag, result = self.ensure_node_id(config)
+            if flag:
+                dump_json(config_path, result, exist_ok=True, override=True)
+
+        return config
+
+    def ensure_level_config(self, path):
+        config_path = os.path.join(path, "config.json")
+        if not os.path.exists(config_path):
+            config = {
+                "node_id": self.gen_node_id()
+            }
+            dump_json(config_path, config, exist_ok=True, override=True)
+        else:
+            config = load_json(config_path)
+            flag, result = self.ensure_node_id(config)
+            if flag:
+                dump_json(config_path, config, exist_ok=True, override=True)
+        return config
+
+    def ensure_chapter_config(self, path):
+        config_path = os.path.join(path, "config.json")
+        if not os.path.exists(config_path):
+            config = {
+                "node_id": self.gen_node_id(),
+                "keywords": []
+            }
+            dump_json(config_path, config, exist_ok=True, override=True)
+        else:
+            config = load_json(config_path)
+            flag, result = self.ensure_node_id(config)
+            if flag:
+                dump_json(config_path, config, exist_ok=True, override=True)
+        return config
+
+    def ensure_section_config(self, path):
+        config_path = os.path.join(path, "config.json")
+        if not os.path.exists(config_path):
+            config = {
+                "node_id": self.gen_node_id(),
+                "keywords": [],
+                "children":[],
+                "export":[]
+            }
+            dump_json(config_path, config, exist_ok=True, override=True)
+        else:
+            config = load_json(config_path)
+            flag, result = self.ensure_node_id(config)
+            if flag:
+                dump_json(config_path, config, exist_ok=True, override=True)
+        return config
+
+    def ensure_node_id(self, config):
+        if "node_id" not in config:
+            config["node_id"] = self.gen_node_id()
+            return True, config
+        else:
+            return False, config
+
+    def gen_node_id(self):
+        return f"{self.name}-{uuid.uuid4().hex}"
+
+    def extract_node_env(self, path):
+        try:
+            _, dir = os.path.split(path)
+            self.logger.info(path)
+            number, title = dir.split(".", 1)
+            return int(number), title
+        except Exception as error:
+            self.logger.error(f"目录 [{path}] 解析失败，结构不合法，可能是缺少序号")
+            sys.exit(1)
+
+    def load_chapter_node(self, full_name):
+        config = self.ensure_chapter_config(full_name)
+        num, name = self.extract_node_env(full_name)
+        result = {
+            name: {
+                "node_id": config["node_id"],
+                "keywords": config["keywords"],
+                "children": [],
+            }
+        }
+        return num, result
+
+    def load_section_node(self, full_name):
+        config = self.ensure_section_config(full_name)
+        num, name = self.extract_node_env(full_name)
+        result = {
+            name: {
+                "node_id": config["node_id"],
+                "keywords": config["keywords"],
+                "children": config.get("children", [])
+            }
+        }
+        # if "children" in config:
+        #     result["children"] = config["children"]
+        return num, result
+
+    def ensure_exercises(self, section_path):
+        config = self.ensure_section_config(section_path)
+        for e in config.get("export", []):
+            full_name = os.path.join(section_path, e)
+            exercise = load_json(full_name)
+            if "exercise_id" not in exercise:
+                exercise["exercise_id"] = uuid.uuid4().hex
+                dump_json(full_name, exercise)
+