seed 填充数据

dist/entity/Post.js

@@ -21,7 +21,8 @@ var _typeorm = require("typeorm");
 
 var _dec, _dec2, _dec3, _dec4, _class, _class2, _descriptor, _descriptor2, _descriptor3, _temp;
 
-var Post = (_dec = (0, _typeorm.Entity)('posts'), _dec2 = (0, _typeorm.PrimaryGeneratedColumn)('increment'), _dec3 = (0, _typeorm.Column)('varchar'), _dec4 = (0, _typeorm.Column)('text'), _dec(_class = (_class2 = (_temp = function Post(attributes) {
+var Post = (_dec = (0, _typeorm.Entity)('posts'), _dec2 = (0, _typeorm.PrimaryGeneratedColumn)('increment'), _dec3 = (0, _typeorm.Column)('varchar'), _dec4 = (0, _typeorm.Column)('text'), _dec(_class = (_class2 = (_temp = // Partial 代表不用把Post的所有属性传进来
+function Post(attributes) {
   (0, _classCallCheck2["default"])(this, Post);
   (0, _initializerDefineProperty2["default"])(this, "id", _descriptor, this);
   (0, _initializerDefineProperty2["default"])(this, "title", _descriptor2, this);
@@ -43,4 +44,34 @@ var Post = (_dec = (0, _typeorm.Entity)('posts'), _dec2 = (0, _typeorm.PrimaryGe
   writable: true,
   initializer: null
 })), _class2)) || _class);
+/*
+@Entity('posts')
+export class Post {
+    @PrimaryGeneratedColumn('increment')
+    id: number;
+    @Column('varchar')
+    title: string;
+    @Column('text')
+    content: string;
+    // 啰嗦的方式
+    constructor(title:string,content:string) {
+        this.title = title;
+        this.content = content;
+    }
+}
+
+// 另一种方式:这个会有问题
+@Entity('posts')
+export class Post {
+    @PrimaryGeneratedColumn('increment')
+    id: number;
+
+    constructor(
+        @Column('varchar') public title:string,
+        @Column('text') public content:string
+        ) {
+    }
+}
+*/
+
 exports.Post = Post;

dist/index.js → dist/seed.js

@@ -10,16 +10,41 @@ require("reflect-metadata");
 
 var _typeorm = require("typeorm");
 
+var _Post = require("./entity/Post");
+
 (0, _typeorm.createConnection)().then( /*#__PURE__*/function () {
   var _ref = (0, _asyncToGenerator2["default"])( /*#__PURE__*/_regenerator["default"].mark(function _callee(connection) {
+    var posts;
     return _regenerator["default"].wrap(function _callee$(_context) {
       while (1) {
         switch (_context.prev = _context.next) {
           case 0:
-            console.log(connection);
-            connection.close();
+            _context.next = 2;
+            return connection.manager.find(_Post.Post);
 
           case 2:
+            posts = _context.sent;
+
+            if (!(posts.length === 0)) {
+              _context.next = 7;
+              break;
+            }
+
+            _context.next = 6;
+            return connection.manager.save([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11].map(function (n) {
+              return new _Post.Post({
+                title: "Post ".concat(n),
+                content: "\u8FD9\u662F\u6211\u7684\u7B2C".concat(n, "\u7BC7\u6587\u7AE0")
+              });
+            }));
+
+          case 6:
+            console.log('posts 数据填充了');
+
+          case 7:
+            connection.close();
+
+          case 8:
           case "end":
             return _context.stop();
         }

scripts/03seed填充数据.md

@@ -0,0 +1,28 @@
+### seed 填充数据
+
+- 前置操作 参考 01docker.md 内容，新建好容器，配置好数据库连接
+
+- 开第一个终端 `yarn dev`
+  - 可以编译我们的 typeorm代码
+
+- 开第二个终端执行数据库迁移
+
+```$xslt
+# 创建数据库表
+yarn migration:run
+# revert操作
+yarn migration:revert   
+```
+
+- 填充数据
+
+```
+# 项目根目录
+node dist/seed.js
+```
+
+- 进入docker容器内部查询
+
+```
+select * from posts;
+```

src/entity/Post.ts

@@ -9,7 +9,38 @@ export class Post {
     @Column('text')
     content: string;
 
+    // Partial 代表不用把Post的所有属性传进来
     constructor(attributes: Partial<Post>) {
         Object.assign(this, attributes);
     }
 }
+
+/*
+@Entity('posts')
+export class Post {
+    @PrimaryGeneratedColumn('increment')
+    id: number;
+    @Column('varchar')
+    title: string;
+    @Column('text')
+    content: string;
+    // 啰嗦的方式
+    constructor(title:string,content:string) {
+        this.title = title;
+        this.content = content;
+    }
+}
+
+// 另一种方式:这个会有问题
+@Entity('posts')
+export class Post {
+    @PrimaryGeneratedColumn('increment')
+    id: number;
+
+    constructor(
+        @Column('varchar') public title:string,
+        @Column('text') public content:string
+        ) {
+    }
+}
+*/

src/seed.ts

@@ -0,0 +1,15 @@
+import "reflect-metadata";
+import {createConnection} from "typeorm";
+import {Post} from "./entity/Post";
+
+createConnection().then(async connection => {
+    const posts = await connection.manager.find(Post);
+
+    if (posts.length === 0) {
+        await connection.manager.save([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11].map(n => {
+            return new Post({title: `Post ${n}`, content: `这是我的第${n}篇文章`});
+        }));
+        console.log('posts 数据填充了');
+    }
+    connection.close();
+}).catch(error => console.log(error));