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[英]Webpack sequelize, sqlite3 error cannot find module sqlite3
[英]Sequelize sqlite3 connects to database but throw error when fetching data
我正在nodejs内使用sqlite3的续集。
到数据库文件的连接运行正常,没有错误,但是第一次尝试访问它时,出现以下错误(无论我尝试执行的表或查询是什么):
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;
和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);
});
我进行了三重检查: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。 我还更改了数据库文件中的chmod a + rwx。
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,但是还没有定义模型,例如
module.exports = (sequelize, DataTypes) => {
const testTable = sequelize.define('model', {
states: {
type: Sequelize.ENUM,
values: ['active', 'pending', 'deleted']
}
});
return testTable;
};
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