【转发请注明出处】 个人博客地址：小猴的代码笔记
1.EggJS引用Sequelize
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安装sequelize依赖和mysql驱动
cnpm i egg-sequelize mysql2 -S -
启用sequelize插件
在config/plugin.js里面添加
sequelize: { enable: true, package: 'egg-sequelize', }, -
配置数据库
在config/config.default.js里面添加
config.sequelize = { dialect: 'mysql', // 表示使用mysql host: '127.0.0.1', // 连接的数据库主机地址 port: 3306, // mysql服务端口 database: 'demo', // 数据库名 username: 'root', // 数据库用户名 password: 'root', // 数据库密码 define: { // model的全局配置 timestamps: true, // 添加create,update,delete时间戳 paranoid: true, // 添加软删除 freezeTableName: true, // 防止修改表名为复数 underscored: false // 防止驼峰式字段被默认转为下划线 }, timezone: '+8:00', // 由于orm用的UTC时间，这里必须加上东八区，否则取出来的时间相差8小时 dialectOptions: { // 让读取date类型数据时返回字符串而不是UTC时间 dateStrings: true, typeCast(field, next) { if (field.type === "DATETIME") { return field.string(); } return next(); } } };
2.定义Model
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刚开始使用egg-init构建的Egg项目是没有app/model目录的，初始的项目结构如下:
itzishu ├── README.md ├── app │ ├── controller │ │ └── home.js │ └── router.js ├── appveyor.yml ├── config │ ├── config.default.js │ └── plugin.js ├── package.json └── test └── app └── controller └── home.test.js先在app目录下新建一个目录为model，里面用来存放所有的数据库里面定义的表的实例对象内容。
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数据库表的内容如下：
/* Navicat Premium Data Transfer Source Server : 系统数据库3306 Source Server Type : MySQL Source Server Version : 50725 Source Host : localhost:3306 Source Schema : demo Target Server Type : MySQL Target Server Version : 50725 File Encoding : 65001 Date: 12/05/2019 15:11:37 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for classes -- ---------------------------- DROP TABLE IF EXISTS `classes`; CREATE TABLE `classes` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(50) NOT NULL, `createdAt` datetime DEFAULT NULL, `updatedAt` datetime DEFAULT NULL, `deletedAt` datetime DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4; -- ---------------------------- -- Records of classes -- ---------------------------- BEGIN; INSERT INTO `classes` VALUES (1, '软件工程1601', '2019-05-12 13:11:43', '2019-05-12 13:11:47', NULL); INSERT INTO `classes` VALUES (2, '网络工程1601', '2019-05-12 13:12:10', '2019-05-12 13:12:13', NULL); COMMIT; -- ---------------------------- -- Table structure for info -- ---------------------------- DROP TABLE IF EXISTS `info`; CREATE TABLE `info` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(50) NOT NULL, `age` int(11) NOT NULL, `sex` tinyint(255) NOT NULL DEFAULT '1' COMMENT '1为男，0为女', `studentId` int(11) NOT NULL, `createdAt` datetime DEFAULT NULL, `updatedAt` datetime DEFAULT NULL, `deletedAt` datetime DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4; -- ---------------------------- -- Records of info -- ---------------------------- BEGIN; INSERT INTO `info` VALUES (1, '许仙', 23, 1, 1, '2019-05-12 13:25:58', '2019-05-12 13:26:01', NULL); INSERT INTO `info` VALUES (2, '白素贞', 20, 0, 2, '2019-05-12 13:26:41', '2019-05-12 13:26:46', NULL); INSERT INTO `info` VALUES (3, '法海', 22, 1, 3, '2019-05-12 13:27:20', '2019-05-12 13:27:22', NULL); INSERT INTO `info` VALUES (4, '小青', 18, 0, 4, '2019-05-12 13:27:48', '2019-05-12 13:27:51', NULL); INSERT INTO `info` VALUES (5, '金如意', 20, 0, 5, '2019-05-12 13:28:34', '2019-05-12 13:28:37', NULL); INSERT INTO `info` VALUES (6, '景松', 23, 1, 6, '2019-05-12 13:30:07', '2019-05-12 13:30:10', NULL); COMMIT; -- ---------------------------- -- Table structure for lession -- ---------------------------- DROP TABLE IF EXISTS `lession`; CREATE TABLE `lession` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(50) NOT NULL, `createdAt` datetime DEFAULT NULL, `updatedAt` datetime DEFAULT NULL, `deletedAt` datetime DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4; -- ---------------------------- -- Records of lession -- ---------------------------- BEGIN; INSERT INTO `lession` VALUES (1, '计算机网络', '2019-05-12 13:12:32', '2019-05-12 13:12:35', NULL); INSERT INTO `lession` VALUES (2, 'Java程序设计', '2019-05-12 13:12:50', '2019-05-12 13:12:52', NULL); INSERT INTO `lession` VALUES (3, '软件项目管理', '2019-05-12 13:13:07', '2019-05-12 13:13:10', NULL); INSERT INTO `lession` VALUES (4, '网络安全', '2019-05-12 13:13:22', '2019-05-12 13:13:25', NULL); COMMIT; -- ---------------------------- -- Table structure for lession_student -- ---------------------------- DROP TABLE IF EXISTS `lession_student`; CREATE TABLE `lession_student` ( `lessionId` int(11) NOT NULL, `studentId` int(11) NOT NULL, `createdAt` datetime DEFAULT NULL, `updatedAt` datetime DEFAULT NULL, `deletedAt` datetime DEFAULT NULL, PRIMARY KEY (`lessionId`,`studentId`) USING BTREE ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; -- ---------------------------- -- Records of lession_student -- ---------------------------- BEGIN; INSERT INTO `lession_student` VALUES (1, 1, '2019-05-12 13:20:35', '2019-05-12 13:20:40', NULL); INSERT INTO `lession_student` VALUES (1, 2, '2019-05-12 13:20:51', '2019-05-12 13:20:53', NULL); INSERT INTO `lession_student` VALUES (1, 3, '2019-05-12 13:21:02', '2019-05-12 13:21:05', NULL); INSERT INTO `lession_student` VALUES (1, 4, '2019-05-12 13:21:15', '2019-05-12 13:21:19', NULL); INSERT INTO `lession_student` VALUES (1, 5, '2019-05-12 13:21:29', '2019-05-12 13:21:32', NULL); INSERT INTO `lession_student` VALUES (1, 6, '2019-05-12 13:21:43', '2019-05-12 13:21:45', NULL); INSERT INTO `lession_student` VALUES (2, 1, '2019-05-12 13:23:10', '2019-05-12 13:23:13', NULL); INSERT INTO `lession_student` VALUES (2, 3, '2019-05-12 13:23:28', '2019-05-12 13:23:31', NULL); INSERT INTO `lession_student` VALUES (2, 4, '2019-05-12 13:23:40', '2019-05-12 13:23:43', NULL); INSERT INTO `lession_student` VALUES (2, 5, '2019-05-12 13:23:54', '2019-05-12 13:23:57', NULL); INSERT INTO `lession_student` VALUES (3, 1, '2019-05-12 13:24:21', '2019-05-12 13:24:24', NULL); INSERT INTO `lession_student` VALUES (3, 4, '2019-05-12 13:24:39', '2019-05-12 13:24:42', NULL); INSERT INTO `lession_student` VALUES (4, 2, '2019-05-12 13:24:59', '2019-05-12 13:25:03', NULL); INSERT INTO `lession_student` VALUES (4, 6, '2019-05-12 13:25:12', '2019-05-12 13:25:15', NULL); COMMIT; -- ---------------------------- -- Table structure for student -- ---------------------------- DROP TABLE IF EXISTS `student`; CREATE TABLE `student` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `number` varchar(12) NOT NULL COMMENT '学号', `password` varchar(32) NOT NULL, `classId` int(11) NOT NULL, `createdAt` datetime DEFAULT NULL, `updatedAt` datetime DEFAULT NULL, `deletedAt` datetime DEFAULT NULL, PRIMARY KEY (`id`,`number`) USING BTREE ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4; -- ---------------------------- -- Records of student -- ---------------------------- BEGIN; INSERT INTO `student` VALUES (1, '160101', '202cb962ac59075b964b07152d234b70', 1, '2019-05-12 13:16:09', '2019-05-12 13:16:12', NULL); INSERT INTO `student` VALUES (2, '160201', '202cb962ac59075b964b07152d234b70', 2, '2019-05-12 13:16:32', '2019-05-12 13:16:35', NULL); INSERT INTO `student` VALUES (3, '160102', '202cb962ac59075b964b07152d234b70', 1, '2019-05-12 13:17:17', '2019-05-12 13:17:21', NULL); INSERT INTO `student` VALUES (4, '160103', '202cb962ac59075b964b07152d234b70', 1, '2019-05-12 13:17:51', '2019-05-12 13:17:54', NULL); INSERT INTO `student` VALUES (5, '160104', '202cb962ac59075b964b07152d234b70', 1, '2019-05-12 13:18:13', '2019-05-12 13:18:16', NULL); INSERT INTO `student` VALUES (6, '160202', '202cb962ac59075b964b07152d234b70', 2, '2019-05-12 13:18:36', '2019-05-12 13:18:39', NULL); COMMIT; SET FOREIGN_KEY_CHECKS = 1;其中，各个表之间存在联系为：
- student与info存在一对一关系
- classes与student存在一对多关系
- student与lession存在多对多关系，中间表为lession_student
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根据数据表的结构，我们确定关系并写好model目录下相关文件
- student.js
module.exports = app => { const { STRING, INTEGER } = app.Sequelize; const Student = app.model.define('student', { id: { type: INTEGER, autoIncrement: true, primaryKey: true }, number: { type: STRING, allowNull: false, }, password: { type: STRING(32), allowNull: false }, classId: { type: INTEGER, allowNull: false } }); Student.associate = function (){ // 与Info存在一对多关系，所以是hasOne() app.model.Student.hasOne(app.model.Info, {foreignKey: 'studentId'}); // 与Classes存在多对一关系，所以使用belongsTo() app.model.Student.belongsTo(app.model.Classes, {foreignKey: 'classId', targetKey: 'id'}); // 与Lessison存在多对多关系，使用belongsToMany() app.model.Student.belongsToMany(app.model.Lession, { through: app.model.LessionStudent, foreignKey: 'studentId', otherKey: 'lessionId' }); } return Student; }- info.js
module.exports = app => { const { STRING, INTEGER, BOOLEAN } = app.Sequelize; const Info = app.model.define('info', { id: { type: INTEGER, autoIncrement: true, primaryKey: true }, name: { type: STRING(50), allowNull: false, }, age: { type: INTEGER, allowNull: false }, sex: { type: BOOLEAN, allowNull: false, get() { if ( this.getDataValue('sex') ){ return '男'; }else { return '女'; } } }, studentId: { type: INTEGER, allowNull: false } }); Info.associate = function (){ app.model.Info.belongsTo(app.model.Student, {foreignKey: 'studentId', targetKey: 'id'}); } return Info; }这里注意下，在sex字段中，有一个get(){}方法，因为在数据表里面，sex字段存了1或0 ，1为男0为女，为了直接返回"男"或"女"，这里使用get方法在找到数据后先做了处理，那返回给调用的函数的数据就是我们设置的值
- classes.js
module.exports = app => { const { STRING, INTEGER, BOOLEAN } = app.Sequelize; const Classes = app.model.define('classes', { id: { type: INTEGER, autoIncrement: true, primaryKey: true }, name: { type: STRING(50), allowNull: false, }, age: { type: INTEGER, allowNull: false }, sex: { type: BOOLEAN, allowNull: false, get() { if ( this.getDataValue('sex') ){ return '男'; }else { return '女'; } } }, studentId: { type: INTEGER, allowNull: false } }); Classes.associate = function (){ // classes与student是一对多关系，所以这里使用hasMany() app.model.Classes.hasMany(app.model.Student, {foreignKey: 'classId', targetKey: 'id'}); } return Classes; }- lession.js
module.exports = app => { const { INTEGER, STRING } = app.Sequelize; const Lession = app.model.define('lession', { id: { type: INTEGER, primaryKey: true, autoIncrement: true }, name: { type: STRING, allowNull: false } }); Lession.associate = function(){ // 与student表是多对多关系 app.model.Lession.belongsToMany(app.model.Student, { through: app.model.LessionStudent, foreignKey: 'lessionId', otherKey: 'studentId' }); } return Lession; }- lession-student.js
module.exports = app => { const { INTEGER } = app.Sequelize; const LessionStudent = app.model.define('lession_student', { lessionId: { type: INTEGER, primaryKey: true }, studentId: { type: INTEGER, primaryKey: true } }); LessionStudent.associate = function(){ } return LessionStudent; } -
总结一下Model定义的内容
- 针对MYSQL常用的字段类型
字段类型从 app.Sequelize 获取，对应名字如下
Sequelize.STRING // VARCHAR(255) Sequelize.STRING(1234) // VARCHAR(1234) Sequelize.STRING.BINARY // VARCHAR BINARY Sequelize.TEXT // TEXT Sequelize.TEXT('tiny') // TINYTEXT Sequelize.INTEGER // INTEGER Sequelize.BIGINT // BIGINT Sequelize.BIGINT(11) // BIGINT(11) Sequelize.FLOAT // FLOAT Sequelize.FLOAT(11) // FLOAT(11) Sequelize.FLOAT(11, 12) // FLOAT(11,12) Sequelize.DOUBLE // DOUBLE Sequelize.DOUBLE(11) // DOUBLE(11) Sequelize.DOUBLE(11, 12) // DOUBLE(11,12) Sequelize.DECIMAL // DECIMAL Sequelize.DECIMAL(10, 2) // DECIMAL(10,2) Sequelize.DATE // DATETIME 针对 mysql / sqlite, TIMESTAMP WITH TIME ZONE 针对 postgres Sequelize.DATE(6) // DATETIME(6) 针对 mysql 5.6.4+. 小数秒支持多达6位精度 Sequelize.DATEONLY // DATE 不带时间. Sequelize.BOOLEAN // TINYINT(1)其他的数据库所允许的类型参考：数据类型
- 字段属性值
属性名 类型 默认值 说明 说明 type Any 无 是 数据类型 primaryKey Boolean false 否 主键 autoIncrement Boolean false 否 自增 allowNull Boolean false 否 是否允许为空 defaultValue Any 无 否 默认值 field String 字段名 否 自定义字段名 unique Any 无 否 约束 - 表与表的关联性
在sequelize中，表与表之间用代码来说存在三种关联关系：一对一，一对多，多对多
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一对一
在该项目中，student表和info表是存在一对一关系的，一个学生有一条专属信息。
在student.js中，使用了hasOne()方法，第一个参数为关联的模型对象Info，第二个参数为一个对象，其包含一个属性为foreginKey为对应的信息表中studentId字段
在info.js中，使用了belongsTo()方法，第一个参数为关联的模型对象Student， 第二个参数也是一个对象，其有两个属性，foreginKey为info表中的"studentId"字段，第二个参数targetKey为student表中的"id"字段
总结： hasOne()和belongsTo()第一个参数为本表关联的另外一个表的Model实例，第二个参数中，都有foreginKey属性，对hasOne来说，这个属性值是对方表与自己Id对应的字段，对belongsTo来说，这个属性值是本表上的与对方表id对应的字段名。belongsTo比hasOne多了个targetKey属性，其为对方表的对应主键名
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一对多
classes与student是一对多的关系，一个班级有多个学生，多个学生组成一个班级。
在student.js中，使用了belongsTo()，在classes.js中，使用了hasMany()，发现hasMany()与belongsTo()所需要的参数是类似的，但是这里注意，hasMany()里面的foreginKey值是对方表的classesId。结合第上面"一对一"的分析，我们可以总结出：
has开头的方法中，foreginKey属性值从对方的表上找，如果有targetKey的值则是自己的主键；
belongs开头的方法中，foreginKey属性值在自身表上找，targetKey属性值则是对方表上
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多对多
分析多对多关系，一个学生有多门课，一个课有多个学生，那我们可以用一个中间表lession-student.js做这个联系。
在student.js中，我们使用了belongsToMany()方法，lession.js文件中也是如此，通过该方法的参数内容，可以发现其多了一个through属性，其值是中间表的Model实例。根据上面的规律，belongs开头的方法里面foreginKey找自己，otherKey找其他，所以很容易理解。
总结： 在Model的实例里面，重写Model的associate方法，将关联的关系放到里面。
一对一的方法有：
hasOne(Model, {foreignKey:对方,})和belongsTo(Model,{foreignKey:自己,targetKey:对方})一对多的方法有：
hasMany(Model,{foreignKey:对方, targetKey:自己})和belongsTo(Model,{foreignKey:自己,targetKey:对方})多对多的方法有：
belongsToMany(Model,{through:Model, targetKey:自己, otherKey:对方})
3.联表查询
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一对一
在controller里面如下写
// 获取学生信息 通过一对多的联系 async info(){ const { ctx, app } = this; let result = await app.model.Student.findAll({ include: { model: app.model.Info } }); ctx.body = result; }获取到的值如下：
[ // 第一个学生 { "id": 1, "number": "160101", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:16:09", "updatedAt": "2019-05-12 13:16:12", "deletedAt": null, "info": { // 联表查到的信息 "sex": "男", "id": 1, "name": "许仙", "age": 23, "studentId": 1, "createdAt": "2019-05-12 13:25:58", "updatedAt": "2019-05-12 13:26:01", "deletedAt": null } }, // 第二个学生 { "id": 2, "number": "160201", "password": "202cb962ac59075b964b07152d234b70", "classId": 2, "createdAt": "2019-05-12 13:16:32", "updatedAt": "2019-05-12 13:16:35", "deletedAt": null, "info": { "sex": "女", "id": 2, "name": "白素贞", "age": 20, "studentId": 2, "createdAt": "2019-05-12 13:26:41", "updatedAt": "2019-05-12 13:26:46", "deletedAt": null } }, { "id": 3, "number": "160102", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:17:17", "updatedAt": "2019-05-12 13:17:21", "deletedAt": null, "info": { "sex": "男", "id": 3, "name": "法海", "age": 22, "studentId": 3, "createdAt": "2019-05-12 13:27:20", "updatedAt": "2019-05-12 13:27:22", "deletedAt": null } }, { "id": 4, "number": "160103", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:17:51", "updatedAt": "2019-05-12 13:17:54", "deletedAt": null, "info": { "sex": "女", "id": 4, "name": "小青", "age": 18, "studentId": 4, "createdAt": "2019-05-12 13:27:48", "updatedAt": "2019-05-12 13:27:51", "deletedAt": null } }, { "id": 5, "number": "160104", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:18:13", "updatedAt": "2019-05-12 13:18:16", "deletedAt": null, "info": { "sex": "女", "id": 5, "name": "金如意", "age": 20, "studentId": 5, "createdAt": "2019-05-12 13:28:34", "updatedAt": "2019-05-12 13:28:37", "deletedAt": null } }, { "id": 6, "number": "160202", "password": "202cb962ac59075b964b07152d234b70", "classId": 2, "createdAt": "2019-05-12 13:18:36", "updatedAt": "2019-05-12 13:18:39", "deletedAt": null, "info": { "sex": "男", "id": 6, "name": "景松", "age": 23, "studentId": 6, "createdAt": "2019-05-12 13:30:07", "updatedAt": "2019-05-12 13:30:10", "deletedAt": null } } ] -
一对多
// 获取班级名为 软件工程1601 的班级学生 async student(){ const { ctx, app } = this; let result = await app.model.Classes.findAll({ where: { name: '软件工程1601' }, include: { model: app.model.Student } }) ctx.body = result; }获取数据如下：
[ { "id": 1, "name": "软件工程1601", "createdAt": "2019-05-12 13:11:43", "updatedAt": "2019-05-12 13:11:47", "deletedAt": null, "students": [ { "id": 1, "number": "160101", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:16:09", "updatedAt": "2019-05-12 13:16:12", "deletedAt": null }, { "id": 3, "number": "160102", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:17:17", "updatedAt": "2019-05-12 13:17:21", "deletedAt": null }, { "id": 4, "number": "160103", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:17:51", "updatedAt": "2019-05-12 13:17:54", "deletedAt": null }, { "id": 5, "number": "160104", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:18:13", "updatedAt": "2019-05-12 13:18:16", "deletedAt": null } ] } ] -
多对多
从学生获取课程信息
// 获取学生的选课内容 async lession(){ const { ctx, app } = this; let result = await app.model.Student.findAll({ where:{ id: 1, }, include: [ {model: app.model.Info}, {model: app.model.Lession} ] }); ctx.body = result; }这里的话，注意include的值为一个数组了，这样可以多个联表获取数据
数据如下：
[ { "id": 1, "number": "160101", "password": "202cb962ac59075b964b07152d234b70", "classId": 1, "createdAt": "2019-05-12 13:16:09", "updatedAt": "2019-05-12 13:16:12", "deletedAt": null, "info": { "sex": "男", "id": 1, "name": "许仙", "age": 23, "studentId": 1, "createdAt": "2019-05-12 13:25:58", "updatedAt": "2019-05-12 13:26:01", "deletedAt": null }, "lessions": [ { "id": 1, "name": "计算机网络", "createdAt": "2019-05-12 13:12:32", "updatedAt": "2019-05-12 13:12:35", "deletedAt": null, "lession_student": { "lessionId": 1, "studentId": 1, "createdAt": "2019-05-12 13:20:35", "updatedAt": "2019-05-12 13:20:40", "deletedAt": null } }, { "id": 2, "name": "Java程序设计", "createdAt": "2019-05-12 13:12:50", "updatedAt": "2019-05-12 13:12:52", "deletedAt": null, "lession_student": { "lessionId": 2, "studentId": 1, "createdAt": "2019-05-12 13:23:10", "updatedAt": "2019-05-12 13:23:13", "deletedAt": null } }, { "id": 3, "name": "软件项目管理", "createdAt": "2019-05-12 13:13:07", "updatedAt": "2019-05-12 13:13:10", "deletedAt": null, "lession_student": { "lessionId": 3, "studentId": 1, "createdAt": "2019-05-12 13:24:21", "updatedAt": "2019-05-12 13:24:24", "deletedAt": null } } ] } ]从课程获取选课学生：
// 获取某个课的参课学生 async lessionStudent(){ const { ctx, app } = this; let result = await app.model.Lession.findAll({ where:{ name: '网络安全' }, include: { model: app.model.Student, include: { model: app.model.Info } } }); ctx.body = result; }这里注意，在include的下面又有一个include，第二个include是相对Student表的
数据如下：
[ { "id": 4, "name": "网络安全", "createdAt": "2019-05-12 13:13:22", "updatedAt": "2019-05-12 13:13:25", "deletedAt": null, "students": [ { "id": 2, "number": "160201", "password": "202cb962ac59075b964b07152d234b70", "classId": 2, "createdAt": "2019-05-12 13:16:32", "updatedAt": "2019-05-12 13:16:35", "deletedAt": null, "lession_student": { "lessionId": 4, "studentId": 2, "createdAt": "2019-05-12 13:24:59", "updatedAt": "2019-05-12 13:25:03", "deletedAt": null }, "info": { "sex": "女", "id": 2, "name": "白素贞", "age": 20, "studentId": 2, "createdAt": "2019-05-12 13:26:41", "updatedAt": "2019-05-12 13:26:46", "deletedAt": null } }, { "id": 6, "number": "160202", "password": "202cb962ac59075b964b07152d234b70", "classId": 2, "createdAt": "2019-05-12 13:18:36", "updatedAt": "2019-05-12 13:18:39", "deletedAt": null, "lession_student": { "lessionId": 4, "studentId": 6, "createdAt": "2019-05-12 13:25:12", "updatedAt": "2019-05-12 13:25:15", "deletedAt": null }, "info": { "sex": "男", "id": 6, "name": "景松", "age": 23, "studentId": 6, "createdAt": "2019-05-12 13:30:07", "updatedAt": "2019-05-12 13:30:10", "deletedAt": null } } ] } ]
4. 总结
用时4小时，调试加数据库设置，代码编写，查文档。允许我偷个懒，不想总结了，仔细阅读内容，基本上可以了解Sequelize在联表查询上的基本用法了
