Deno GraphQL 后端开发

Deno GraphQL 后端开发

三层架构

src/​{mod}/​{table}/
├── {table}.graphql.ts   # Schema 定义
├── {table}.model.ts     # Model 定义(可选)
├── {table}.resolver.ts  # 参数处理、事务/认证设置
└── {table}.service.ts   # 业务逻辑、调用 DAO

快速模板

1. GraphQL Schema

import { defineGraphql } from "/​lib/​context.ts";
import * as resolver from "./​{table}.resolver.ts";

defineGraphql(resolver, /​* GraphQL */ `
  
  type {Table}Model {
    id: {Table}Id!
    lbl: String!
  }
  
  input {Table}Input {
    lbl: String!
  }
  
  input {Table}Search {
    lbl: String
  }
  
  type Query {
    "查询"
    get{Table}(id: {Table}Id!): {Table}Model
    "列表"
    findAll{Table}(search: {Table}Search): [{Table}Model!]!
  }
  
  type Mutation {
    "创建"
    create{Table}(input: {Table}Input!): {Table}Id!
    "更新"
    update{Table}(id: {Table}Id!, input: {Table}Input!): Boolean!
    "删除"
    delete{Table}(ids: [{Table}Id!]!): Int!
  }
`);

2. Resolver

import {
  useContext,
} from "/​lib/​context.ts";

import type {
  {Table}Id,
  {Table}Input,
  {Table}Search,
} from "/​gen/​types.ts";

// 查询 - 不需要事务
export async function get{Table}(
  id: {Table}Id,
) {
  
  const {
    get{Table},
  } = await import("./​{table}.service.ts");
  
  return await get{Table}(id);
}

// 修改 - 需要事务
export async function create{Table}(input: {Table}Input) {
  
  const {
    create{Table},
  } = await import("./​{table}.service.ts");
  
  const context = useContext();
  context.is_tran = true;  // 开启事务
  
  return await create{Table}(input);
}

3. Service

import {
  isEmpty,
} from "/​lib/​util/​string_util.ts";

import {
  findById{Table},
  create{Table},
} from "/​gen/​{mod}/​{table}/​{table}.dao.ts";

import type {
  {Table}Id,
  {Table}Input
} from "/​gen/​types.ts";

export async function create{Table}(
  input: {Table}Input,
) {
  if (isEmpty(input.lbl)) {
    throw "名称不能为空";  // 业务错误用中文
  }
  return await create{Table}(input);
}

4. 注册模块

在 src/​{mod}/​graphql.ts 添加：

import "./​{table}/​{table}.graphql.ts";

核心规则

详细参考

• DAO 函数 - 查询/创建/更新/删除函数
• 认证权限 - 用户获取、权限检查、数据隔离
• 架构约定 - 目录结构、命名规范