prisma 初探

[TOC]

什么是Prisma？

Next-generation ORM for Node.js and TypeScript（下一代Node.js的ORM框架），目前仅支持PostgreSQL, MySQL and SQLite.

一步一步创建

1. 创建项目目录

   • $ mkdir hello-prisma && cd hello-prisma

2. 初始化项目并安装依赖文件

   • $ npm init -y
   • $ npm install prisma typescript ts-node @types/node --save-dev

3. 创建tsconfig.json, 并输入以下内容

   • {
       "compilerOptions": {
         "sourceMap": true,
         "outDir": "dist",
         "strict": true,
         "lib": ["esnext"],
         "esModuleInterop": true
       }
     }
     

4. 创建 Prisma schema文件

   • npx prisma init
     • 
     • 生成了如下文件
       • 

5. 设置数据库，修改prisma/schema.prisma的provider属性

   • datasource db {
       // provider可以设置三种属性: mysql, sqlite, postgresql
       provider = "mysql"
       url      = env("DATABASE_URL")
     }
     
     generator client {
       provider = "prisma-client-js"
     }
     
     

6. 修改env文件中的DATABASE_URL，生成规则： 数据库名称://USER:PASSWORD@HOST:PORT/DATABASE?schema=SCHEMA，例如我的mysql地址为：mysql://root:12345678@localhost:3432/mydb?schema=public

7. 向prisma/schema.prisma中追加内容

   • model Post {
       id        Int      @default(autoincrement()) @id
       createdAt DateTime @default(now())
       updatedAt DateTime @updatedAt
       title     String   @db.VarChar(255)
       content   String?
       published Boolean  @default(false)
       author    User     @relation(fields: [authorId], references: [id])
       authorId  Int
     }
     
     model Profile {
       id     Int     @default(autoincrement()) @id
       bio    String?
       user   User    @relation(fields: [userId], references: [id])
       userId Int     @unique
     }
     
     model User {
       id      Int      @default(autoincrement()) @id
       email   String   @unique
       name    String?
       posts   Post[]
       profile Profile?
     }
     

8. 生成数据库表$ npx prisma migrate dev --name init

生成了如下文件：

9. 安装Prisma Client: $ npm install @prisma/client
10. 创建index.ts并输入输入下内容

import { PrismaClient } from '@prisma/client'

const prisma = new PrismaClient()

async function main() {
  // ... you will write your Prisma Client queries here
  const allUsers = await prisma.user.findMany()
  console.log(allUsers)
}

main()
  .catch((e) => {
    throw e
  })
  .finally(async () => {
    await prisma.$disconnect()
  })

通过npx ts-node index.ts 执行上面的代码，输出的结果为：[]

11. 更新man方法

async function main() {
  // ... you will write your Prisma Client queries here
  await prisma.user.create({
    data: {
      name: 'Alice',
      email: 'alice@prisma.io',
      posts: {
        create: { title: 'Hello World' },
      },
      profile: {
        create: { bio: 'I like turtles' },
      },
    },
  })

  const allUsers = await prisma.user.findMany({
    include: {
      posts: true,
      profile: true,
    },
  })
  console.dir(allUsers, { depth: null })
}

执行代码结果为

[
  {
    email: 'alice@prisma.io',
    id: 1,
    name: 'Alice',
    posts: [
      {
        content: null,
        createdAt: 2020-03-21T16:45:01.246Z,
        id: 1,
        published: false,
        title: 'Hello World',
        authorId: 1,
      }
    ],
    profile: {
      bio: 'I like turtles',
      id: 1,
      userId: 1,
    }
  }
]

12. 在 Prisma Studio中查看数据: $ npx prisma studio

选择一项看到下面的数据

参考地址

• www.prisma.io/docs/gettin…