egg.js sequelize数据库操作配置

文章目录

[egg.js sequelize数据库操作配置](#egg.js sequelize数据库操作配置)
- [1. 数据库配置](#1. 数据库配置)
- [2. 迁移配置](#2. 迁移配置)
- 3.数据表设计和迁移
- 4.模型创建

1. 数据库配置

安装并配置egg-sequelize插件（它会辅助我们将定义好的 Model 对象加载到 app 和 ctx 上）和mysql2模块：

shell 复制代码

npm install --save egg-sequelize mysql2

在config/plugin.js中引入 egg-sequelize插件

js 复制代码

exports.sequelize = {
  enable: true,
  package: "egg-sequelize",
};

在config/config.default.js

js 复制代码

config.sequelize = {
  dialect: "mysql",
  host: "127.0.0.1",
  username: "root",
  password: "root",
  port: 3306,
  database: "egg-wechat",
  // 中国时区
  timezone: "+08:00",
  define: {
    // 取消数据表名复数
    freezeTableName: true,
    // 自动写入时间戳 created_at updated_at
    timestamps: true,
    // 字段生成软删除时间戳 deleted_at
    // paranoid: true,
    createdAt: "created_at",
    updatedAt: "updated_at",
    // deletedAt: 'deleted_at',
    // 所有驼峰命名格式化
    underscored: true,
  },
};

2. 迁移配置

sequelize 提供了sequelize-cli工具来实现Migrations，我们也可以在 egg 项目中引入 sequelize-cli。

shell 复制代码

npm install --save-dev sequelize-cli

egg 项目中，我们希望将所有数据库 Migrations 相关的内容都放在database目录下，所以我们在项目根目录下新建一个.sequelizerc配置文件：

js 复制代码

"use strict";

const path = require("path");

module.exports = {
  config: path.join(__dirname, "database/config.json"),
  "migrations-path": path.join(__dirname, "database/migrations"),
  "seeders-path": path.join(__dirname, "database/seeders"),
  "models-path": path.join(__dirname, "app/model"),
};

初始化 Migrations 配置文件和目录

shell 复制代码

npx sequelize init:config
npx sequelize init:migrations
# npx sequelize init:models

运行完后会生成database/config.json文件和database/migrations目录，我们修改一下database/config.json中的内容，将其改成我们项目中使用的数据库配置：

json 复制代码

{
  "development": {
    "username": "root",
    "password": null,
    "database": "eggapi",
    "host": "127.0.0.1",
    "dialect": "mysql",
    "timezone": "+08:00"
  }
}

创建数据库

shell 复制代码

npx sequelize db:create
# 升级数据库
npx sequelize db:migrate
# 如果有问题需要回滚，可以通过 `db:migrate:undo` 回退一个变更
# npx sequelize db:migrate:undo
# 可以通过 `db:migrate:undo:all` 回退到初始状态
# npx sequelize db:migrate:undo:all

3.数据表设计和迁移

创建数据迁移表

shell 复制代码

npx sequelize migration:generate --name=user

1.执行完命令后，会在database / migrations / 目录下生成数据表迁移文件，然后定义

js 复制代码

"use strict";

module.exports = {
  up: async (queryInterface, Sequelize) => {
    const { INTEGER, STRING, DATE, ENUM } = Sequelize;
    // 创建表
    await queryInterface.createTable("user", {
      id: {
        type: INTEGER(20).UNSIGNED,
        primaryKey: true,
        autoIncrement: true,
      },
      username: {
        type: STRING(30),
        allowNull: false,
        defaultValue: "",
        comment: "用户名称",
        unique: true,
      },
      nickname: {
        type: STRING(30),
        allowNull: false,
        defaultValue: "",
        comment: "...",
      },
      email: {
        type: STRING(160),
        comment: "用户邮箱",
        unique: true,
      },
      password: {
        type: STRING(200),
        allowNull: false,
        defaultValue: "",
      },
      avatar: {
        type: STRING(200),
        allowNull: true,
        defaultValue: "",
      },
      phone: {
        type: STRING(20),
        comment: "用户手机",
        unique: true,
      },
      sex: {
        type: ENUM,
        values: ["男", "女", "保密"],
        allowNull: true,
        defaultValue: "男",
        comment: "用户性别",
      },
      status: {
        type: INTEGER(1),
        allowNull: false,
        defaultValue: 1,
        comment: "状态",
      },
      sign: {
        type: STRING(200),
        allowNull: true,
        defaultValue: "",
        comment: "个性签名",
      },
      area: {
        type: STRING(200),
        allowNull: true,
        defaultValue: "",
        comment: "地区",
      },
      created_at: DATE,
      updated_at: DATE,
    });
  },

  down: async (queryInterface) => {
    await queryInterface.dropTable("user");
  },
};

执行 migrate 进行数据库变更

shell 复制代码

npx sequelize db:migrate

4.模型创建

js 复制代码

// app/model/user.js
"use strict";
module.exports = (app) => {
  const { STRING, INTEGER, DATE, ENUM, TEXT } = app.Sequelize;
  // 配置（重要：一定要配置详细，一定要！！！）
  const User = app.model.define("user", {
    id: {
      type: INTEGER(20).UNSIGNED,
      primaryKey: true,
      autoIncrement: true,
    },
    username: {
      type: STRING(30),
      allowNull: false,
      defaultValue: "",
      comment: "用户名称",
      unique: true,
    },
    nickname: {
      type: STRING(30),
      allowNull: false,
      defaultValue: "",
      comment: "...",
    },
    email: {
      type: STRING(160),
      comment: "用户邮箱",
      unique: true,
    },
    password: {
      type: STRING(200),
      allowNull: false,
      defaultValue: "",
    },
    avatar: {
      type: STRING(200),
      allowNull: true,
      defaultValue: "",
    },
    phone: {
      type: STRING(20),
      comment: "用户手机",
      unique: true,
    },
    sex: {
      type: ENUM,
      values: ["男", "女", "保密"],
      allowNull: true,
      defaultValue: "男",
      comment: "用户性别",
    },
    status: {
      type: INTEGER(1),
      allowNull: false,
      defaultValue: 1,
      comment: "状态",
    },
    sign: {
      type: STRING(200),
      allowNull: true,
      defaultValue: "",
      comment: "个性签名",
    },
    area: {
      type: STRING(200),
      allowNull: true,
      defaultValue: "",
      comment: "地区",
    },
    created_at: DATE,
    updated_at: DATE,
  });
  return User;
};