我是MongoDB的新手。现在,我正在使用Mongoose在我的express.js应用程序中处理数据库。我的问题是我不知道什么时候应该关闭连接?既然有人说最好关闭它,而有人说让它打开? db.close()
和mongoose.disconnect()
有什么区别?您使用这些工具有什么经验?
谢谢!
打开连接并在路线/服务之间共享连接。您可以在开始表达之前初始化数据库和所有相关的架构。
import mongoose from 'mongoose';
// define models
import User from './user';
import Order from './order';
// connect to db
const connect = async () => {
await mongoose.connect(process.env.DATABASE_URL);
return mongoose.connection;
};
const models = { User, Order };
export { connect };
export default models;
然后在启动Express之前先连接:
import models, { connect } from './models';
...
// connect to the db
const connection = await connect();
// now pass in the models to your routes
request('./routes/users')(models);
request('./routes/orders')(models);
// or use middleware so you can access in routes like req.models.user.find({})
app.use((req, res, next) => {
req.models = models;
next();
})
app.listen(process.env.PORT, () =>
console.log(`Example app listening on port ${process.env.PORT}!`),
);
您可以添加一个清理处理程序来侦听process.exit并在那里关闭连接。大致类似:
const cleanUp = (eventType) => {
connection.close(() => {
console.info('closed');
});
};
[`exit`, `SIGINT`, `SIGUSR1`, `SIGUSR2`, `uncaughtException`, `SIGTERM`].forEach((eventType) => {
process.on(eventType, cleanUp.bind(null, eventType));
})