Sequelize sqlite3 连接数据库但在获取数据时抛出错误答案

【问题标题】：Sequelize sqlite3 connects to database but throw error when fetching dataSequelize sqlite3 连接数据库但在获取数据时抛出错误
【发布时间】：2018-11-30 06:27:45
【问题描述】：

我在 nodejs 中使用带有 sqlite3 的 sequelize。

与数据库文件的连接运行良好，没有错误，但是当我第一次尝试访问它时出现以下错误（无论我尝试执行什么表或查询）：

TypeError: Cannot read property 'findOne' of undefined
    at l.a.sequelize.authenticate.then (/usr/local/bin/aeirtu/node/webpack:/server.js:55:1)
    at tryCatcher (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/promise.js:512:31)
    at Promise._settlePromise (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/promise.js:569:18)
    at Promise._settlePromise0 (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/promise.js:614:10)
    at Promise._settlePromises (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/promise.js:693:18)
    at Async._drainQueue (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/async.js:133:16)
    at Async._drainQueues (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/async.js:143:10)
    at Immediate.Async.drainQueues [as _onImmediate] (/usr/local/bin/aeirtu/node/node_modules/bluebird/js/release/async.js:17:14)
    at runCallback (timers.js:763:18)
    at tryOnImmediate (timers.js:734:5)
    at processImmediate (timers.js:716:5)

这是我的连接代码：

我的 node.js 代码：

import express from "express";

import models from "./models";

const app = express();

models.sequelize
    .authenticate()
    .then(() => {
        console.log("Connected to repository");
    })
    .catch(err => {
        console.log("ERROR connecting to repository.");
        console.log(err);
    });

let port = 3001;
app.listen(port, () => {
    console.log("Server listening on port " + port);
});

我的models.js：

import Sequelize from "sequelize";
import fs from "fs";
import path from "path";

const DATABASE_FILENAME = "test.db";

const fileWithPath = path.join(process.env.TEST_HOME, 'data', DATABASE_FILENAME);

let basename = path.basename(__filename);
let env = process.env.NODE_ENV || "development";
let db = {};

console.log("Connecting to repository at " + fileWithPath);

// database wide options
let opts = {
  dialect: "sqlite",
  storage: fileWithPath,
  define: {
    //prevent sequelize from pluralizing table names
    freezeTableName: true,
    // don't add the timestamp attributes (updatedAt, createdAt)
    timestamps: false
  },
  operatorsAliases: Sequelize.Op, // use Sequelize.Op https://github.com/sequelize/sequelize/issues/8417#issuecomment-334056048
};

let sequelize = new Sequelize(DATABASE_FILENAME, null, null, opts);

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

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

db.sequelize = sequelize;
db.Sequelize = Sequelize;

export default db;

还有一个简单的测试代码：

import db from "./models";

db.TestTable.findOne().then(data => {
    if (!data) console.log("ERROR FETCHING DATA");
    console.log(data.name);
});

我已经三重检查：sqlite3 文件位于正确的位置，并且表中包含数据。由于某种原因，我当时无法访问。我还在数据库文件中更改了 chmod a+rwx。

【问题讨论】：

标签： javascript node.js sqlite sequelize.js

【解决方案1】：

您忘记导入 *TestTable 模型`

db.TestTable = require('./TestTable')(sequelize, Sequelize);

您的model.js 应该是一个连接但目前还没有定义模型

module.exports = (sequelize, DataTypes) => {  
    const testTable = sequelize.define('model', {
      states: {
        type:   Sequelize.ENUM,
        values: ['active', 'pending', 'deleted']
      }
    });

    return testTable;
};

Sample

【讨论】：