小编Kau*_*ana的帖子

我尝试CURD使用Flask和SQLAlchemy.But Error连接到数据库时进行操作.

这是Error日志.

/usr/local/lib/python3.4/dist-packages/flask_sqlalchemy/__init__.py:819: UserWarning: SQLALCHEMY_DATABASE_URI not set. Defaulting to "sqlite:///:memory:".
  'SQLALCHEMY_DATABASE_URI not set. Defaulting to '
/usr/local/lib/python3.4/dist-packages/flask_sqlalchemy/__init__.py:839: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '

这是我的代码和设置

# database.py
from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
sqldb = SQLAlchemy(app)
app.config['SQLALCHEMY_DATABASE_URI'] = "mysql+pymysql://root:root@localhost/myDbName"


# create …

我是新手NativeScript，我尝试使用NativeScript和运行我的 HelloWord 应用程序Angular。我连接了我的 android 设备，然后我运行命令tns run android它如何我跟随错误。

Error: ENOTEMPTY: directory not empty, rmdir 'C:\Users\Admin\AppData\Local\Temp\runtimeDir11923-7308-1ed73lj.8p03\framework\app\libs\runtime-libs'                          at Object.fs.rmdirSync (fs.js:846:18)

at rmkidsSync (C:\Users\Admin\AppData\Roaming\npm\node_modules\nativescript\node_modules\temp\node_modules\rimraf\rimraf.js:247:11)

at rmdirSync (C:\Users\Admin\AppData\Roaming\npm\node_modules\nativescript\node_modules\temp\node_modules\rimraf\rimraf.js:237:7)

at fixWinEPERMSync (C:\Users\Admin\AppData\Roaming\npm\node_modules\nativescript\node_modules\temp\node_modules\rimraf\rimraf.js:150:5)


at rimrafSync (C:\Users\Admin\AppData\Roaming\npm\node_modules\nativescript\node_modules\temp\node_modules\rimraf\rimraf.js:216:26)    
at C:\Users\Admin\AppData\Roaming\npm\node_modules\nativescript\node_modules\temp\node_moules\rimraf\rimraf.js:245:5

我怎么了？你能帮忙吗？

我尝试使用npm mongoose-paginate但是填充不能正常工作

这是我的 UsersSchema.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var usersSchema = new Schema({
    name : String,
    created_at : { type : Date, default : Date.now }
});

module.exports = mongoose.model('users',usersSchema);

这是帖子架构

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var mongoosePaginate = require('mongoose-paginate');

var postsSchema = new Schema({
    user : { type: Schema.Types.ObjectId, ref: 'users' },
    post : String,
    created_at : { type : Date, default : Date.now }
});
postsSchema.plugin(mongoosePaginate);
module.exports = mongoose.model('posts',postsSchema); …

我正试图在MongoDB中找到一条记录,并_id从结果中过滤.

这是我的代码:

#app.py
@app.route('/login', methods = ['GET', 'POST'])
def login():
    if request.method == "POST":
        password = request.form.get('password')
        email = request.form.get('email')
        db = get_db()
        data = db.author.find_one({'email' : email, 'password' : password})
        print(data)
        return 'data'
    else:
        return render_template('login.html')

输出:

{'password': '123123', 'name': '<my_name>', 'email': '<my_email>', '_id': ObjectId('<an_object_id_string>')}

如何_id从输出中过滤字段？

我需要连接两个数据库.默认数据库是固定的,但另一个是动态的,它基于URL.

例如,如果url是:yourapp.myweb.com,那么第二个数据库名称将是yourapp

我尝试将数据库连接到init .py但它显示我跟随错误

builtins.AssertionError
AssertionError: A setup function was called after the first request was handled.  This usually indicates a bug in the application where a module was not imported and decorators or other functionality was called too late.
To fix this make sure to import all your view modules, database models and everything related at a central place before the application starts serving requests.

这是我的init .py

from flask import Flask,session
from flask_sqlalchemy import SQLAlchemy
import …

当我更新记录时,它会删除现有字段并添加新字段.

这是更新前的记录:

{ "_id" : ObjectId("56a356863aa433ae37dc2cee"), "browser" : "Chrome", "version" : 47}

这是我执行的命令:

db.collection('profiles')
  .update({ 
    '_id' : obj("56a356863aa433ae37dc2cee") }, 
    {"first_name" : first_name, "last_name" : last_name, "email" : email}, 
    function (err, result) {
      console.log(result);
  });

这是我执行update命令后的记录:

{ "_id" : ObjectId("56a356c9a08487ed3719e40a"), "first_name" : "kaushik", "last_name" : "makwana", "email" : "kdmakwana" }

我想为我的项目创建饼图,所以我正在使用ChartJS,但是mapJS存在一些问题,如果我使用10到20个数据字段,时间图表看起来不错,但是当我申请更多时在一个图表中超过50到60个数据字段,因此该图表看起来更小而不是图例,并且如果有时数据字段太多而不是图表隐藏,则只能看到图例,图表消失了.

我想将高度或宽度设置为该图例,如果有更多数据,还应用于滚动条.

这是小提琴链接供您参考

https://jsfiddle.net/KDM1010/5um78rbk/

<canvas id="myChart" width="500" height="300"></canvas>


var ctx = document.getElementById("myChart").getContext('2d');
    var myChart = new Chart(ctx, {
      type: 'pie',
      data: {
        labels: ["lable_1", "lable_2", "lable_3", "lable_4", "lable_5", "lable_6", "lable_7", "lable_8", "lable_9", "lable_10", "lable_11", "lable_12", "lable_13", "lable_14", "lable_15", "lable_16", "lable_17", "lable_18", "lable_19", "lable_20", "lable_21", "lable_22", "lable_23", "lable_24", "lable_25", "lable_26", "lable_27", "lable_28", "lable_29", "lable_30", "lable_31", "lable_32", "lable_33", "lable_34", "lable_35", "lable_36", "lable_37", "lable_38", "lable_39", "lable_40", "lable_41", "lable_42", "lable_43", "lable_44", "lable_45", "lable_46", "lable_47", "lable_48", "lable_49", "lable_50"],
        datasets: [{
          backgroundColor: ["#2ecc71","#3498db","#95a5a6","#9b59b6","#f1c40f","#e74c3c","#34495e","#2ecc71","#3498db","#9a5a6","#9b59b6","#f1c40f","#e74c3c","#34495e","#2ecc71","#3498db","#95a5a6","#9b59b6","#f1c40","#e74c3c","#34495e","#2ecc71","#3498db","#95a5a6","#9b59b6","#f1c40f","#e74c3c","#34495e","#2ecc71","#3498db","#95a5a6","#9b59b6","#f1c40f","#e74c3c","#34495e","#2ecc71","#3498db","#955a6","#9b59b6","#f1c40f","#e74c3c","#34495e","#2ecc71","#3498db","#95a5a6","#9b59b6","#f1c40f,"#e74c3c","#34495e","#2ecc71","#3498db","#95a5a6","#9b59b6","#f1c40f","#e74c3c","#34495e"
          ],
          data: [74, …

我试图用mongoengine和烧瓶从mongodb中获取数据.查询是完美的工作问题是当我将查询结果转换为json时,它只显示字段名称.

这是我的代码

view.py

from model import Users
result = Users.objects()
print(dumps(result))

model.py

class Users(DynamicDocument):
    meta = {'collection' : 'users'}
    user_name = StringField()
    phone = StringField()

产量

[["id", "user_name", "phone"], ["id", "user_name", "phone"]]

为什么它只显示字段名称？

我是Python和MongoDB的新手,我正在使用flask-python和MongoDB开始一个新项目.当我尝试使用该aggregate()函数返回数据时,它给出了以下错误:

命令游标'对象不可订阅.

这是我的查询代码:

Data = db.mytable.aggregate([ { "$group": {"_id": "$Name" ,"count": { "$sum": 1 }}}])
return Data['result']

我也改变了这个:

Data = db.mytable.aggregate([ { "$group": {"_id": "$Name" ,"count": { "$sum": 1 }}}],userCursor= False)

但它给了我以下错误:

error.pymongo.errors.OperationFailure:command SON([('aggregate','mytable'),('pipeline',[{'$ group':{'_ id':'$ Name','count':{' $ sum':1}}}]),('useCursor',False)])命名空间mydb.$ cmd失败:无法识别的字段'useCursor

注意:我使用的是MongoDB 3.2和Python3

我是新来的Angular。我尝试使用Nodejs和创建 CRUD 操作Angular。我正在使用NodejsandExpress作为后端和Angular前端。

当我使用 routerLink 在页面上导航时，它工作正常，但是当我在页面上导航然后刷新页面时，它会显示页面未找到错误。

我知道那里发生了什么，Express 应用程序中没有定义路线，所以我刷新页面，它显示 404 错误。

如何使其与 Angular 和 Express 路线配合使用？

这是我的代码。

app.js（ 服务器 ）

const express = require('express');
const path = require('path');
const http = require('http');
const bodyParser = require('body-parser');
var app = express();


app.use(bodyParser.urlencoded({extended : false}));
app.use(bodyParser.json());

app.use(express.static(path.join(__dirname,'dist/MEAN-blog')));


app.get('/',(req,res) =>{
    res.sendFile(path.join(__dirname,'dist/MEAN-blog/index.html'));
});

app.post('/register',(req,res) =>{
    var u = new User(req.body);
    u.save();
    res.send(u).status(200);
})


var server  = http.createServer(app);

server.listen(8080,'0.0.0.0',() =>{
    console.log('Server is running …