我有一个在 NodeJS(express + mongoose + jade)上运行的应用程序。 我有一个后路由/search(所有路由都在一个单独的模块中),它应该处理从mongo数据库获取数据并将其插入到jade模板中(在本例中只是打印控制台):
router.post('/search', function (req,res) {
var componentsArray = null;
function getArray(){
console.log('Initializing...');
componentsArray = dataExchanger.search(req.body.select, req.body.selectType, req.body.searchField);
}
getArray(function () {
console.log('Documents returned.');
console.log('Printing array...');
console.log('Array: ' + componentsArray);
console.log('Array type: ' + typeof (componentsArray));
console.log('Rendering page...');
res.render('search_results');
});
});
在不同模块中实现的搜索和获取功能dataExchanger:
exports.search = function(select, type, data) {
console.log('Fetching documents...');
componentsModel.find({name: data}, function (err, docs) {
if(!err) {
console.log('Returning documents...');
return docs;
} else {
console.log('Can\'t return documents!');
throw err;
}
});
};
问题是,当我使用getArray()的回调函数时,服务器在返回文档时卡住并停止响应。 我做错了什么?
最佳答案
尝试使用异步/等待
router.post('/search', async (req,res) => {
let componentsArray;
try {
componentsArray = await dataExchanger.search(req.body.select, req.body.selectType, req.body.searchField);
} catch(e){
//If error in request and no data.
console.error('Error', e.message);
return res.render('error_message');
}
console.log('Documents returned.');
console.log('Printing array...');
console.log('Array: ' + componentsArray);
console.log('Array type: ' + typeof (componentsArray));
console.log('Rendering page...');
res.render('search_results');
});
这是您的数据交换器
exports.search = function(select, type, data) {
console.log('Fetching documents...');
return new Promise((resolve, reject) => {
componentsModel.find({name: data}, function (err, docs) {
if(err) return reject(err);
resolve(docs);
});
})
};
进一步阅读:promises , async/await
关于javascript - NodeJS 异步数据库获取服务器卡住,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50838457/