Question

我的模特

index.js

'use strict';

var fs        = require('fs');
var path      = require('path');
var Sequelize = require('sequelize');
var basename  = path.basename(module.filename);
var env       = process.env.NODE_ENV || 'development';
var config    = require(__dirname + '/../config/config.json')[env];
var db        = {};

if (config.use_env_variable) {
  var sequelize = new Sequelize(process.env[config.use_env_variable]);
} else {
  var sequelize = new Sequelize(config.database, config.username, config.password, config);
}

fs
  .readdirSync(__dirname)
  .filter(function(file) {
    return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
  })
  .forEach(function(file) {
    var model = sequelize['import'](path.join(__dirname, file));
    db[model.name] = model;
  });

Object.keys(db).forEach(function(modelName) {
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});

db.sequelize = sequelize;

module.exports = db;

course.js

'use strict';
module.exports = function(sequelize, DataTypes) {
  var Course = sequelize.define('Course', {
    title: DataTypes.STRING,
    url: DataTypes.STRING,
    downloaded: DataTypes.BOOLEAN,
    date_published: DataTypes.DATEONLY
  }, {
    underscored: true,
    classMethods: {
      associate: function(models) {
        // associations can be defined here
      }
    }
  });
  return Course;
};

test.js

const Course = require('./models').Course
const courses = [
    {
        title: 'xyz1',
        url: 'https://www.example.com/xyz1'
    },
    {
        title: 'xyz2',
        url: 'https://www.example.com/xyz2'
    }
]


courses.forEach(item => Course.create(item).then(course => {}))

My Problem: 现在，当运行node test.js 时，代码后不会退出执行。

Answer 1

Try rewriting your code as -

const db = require('./models');
const Course = db.Course;

const courses = [
    {
        title: 'xyz1',
        url: 'https://www.example.com/xyz1'
    },
    {
        title: 'xyz2',
        url: 'https://www.example.com/xyz2'
    }
];

function _createCourses(courseList) {
   courseList.forEach(course => {
      Course.create(course).then(createdCourse => {
         console.log(createdCourse.get({
            plain: true
         }));
      });
   });
}

db.sequelize.sync()
  .then(() => {
     _createCourses(courses);
  });

The only difference here is we are calling sequalize.sync before creating the model objects. sync actually syncs all defined models in db. Check out the documentation for details - sequalize.sync

Answer 2

当我们从命令行运行脚本时，sequelize连接池未关闭，这就是为什么我们需要调用sequelize.close()（http://docs.sequelizejs.com/manual/tutorial/upgrade-to-v4.html#general）来关闭已完成作业的缓冲池或运行{{ 1}}也会杀死池。

在节点中直到完成所有工作为止，例如，侦听某事或任何process.exit()的事件，或者像此处的任何连接打开（套接字连接）执行都不会完成。这就是为什么执行还没有完成的原因。

插入数据库进程后sequelize.js不会退出/关闭

2 个答案: