[英]How to use flask script to connect mysql data base to my ios app
我有一个应用程序,我可以使用它将数据写入我的数据库,但不能从数据库中读取数据。 我希望能够随时将数据从数据库发送到我的应用程序,我认为这是通过 flask 中的 get 和 post http 方法完成的。 这应该使用相同的脚本还是单独的脚本来完成? 如果单独的脚本,我应该如何编写它们? 如果不是,我不确定要向我的 swift 和 python 文件添加什么。
我正在使用的代码使用 flask 和 mysql-connector 进行数据库连接,任何修改以从数据库读取数据的帮助将不胜感激:
应用程序.py
from flask import Flask
from flask import make_response
from flask import request
import mysql.connector
#opens database connectionto "events" database
try:
mydb = mysql.connector.connect(host="localhost", user="root", passwd="Proteus^5", database = "events")
print("Connection OK")
except e:
print("Connection failed: ", e)
#prepare a cursor object using cursor() method
mycursor = mydb.cursor()
app = Flask(__name__)
@app.route('/', methods=['GET', 'POST'])
def register():
event_id = request.form['a']
poi = request.form['b']
address = request.form['c']
start_time = request.form['d']
end_time = request.form['e']
sql = "INSERT INTO events (event_id, poi, address, start_time, end_time) VALUES (%s, %s, %s, %s, %s)"
val = (event_id, poi, address, start_time, end_time)
try:
# Execute the SQL command
mycursor.execute(sql, val)
# Commit your changes in the database
mydb.commit()
mydb.close()
except e:
# Rollback in case there is any error
print("Error: ", e)
mydb.rollback()
return make_response("Success!", 200)
print("DB is closed")
swift 文件在按下按钮时将数据发送到数据库:
import Foundation
import SwiftUI
struct CreateEventButton: View {
@State private var isPresentedEvent = false
@State private var eventid: Int = 3
@State private var eventName: String = ""
@State private var eventDescription: String = ""
@State private var selectedStartTime = Date()
@State private var selectedEndTime = Date()
@Binding var annotationSelected: Bool
func send(_ sender: Any) {
let request = NSMutableURLRequest(url: NSURL(string: "http://localhost:5000/")! as
URL)
request.httpMethod = "POST"
let postString = "a=\(self.eventid)&b=\(self.eventName)&c=\.
(self.eventDescription)&d=\.
(self.selectedStartTime)&e=\(self.selectedEndTime)"
request.httpBody = postString.data(using: String.Encoding.utf8)
let task = URLSession.shared.dataTask(with: request as URLRequest) {
data, response, error in
if error != nil {
print("error=\(String(describing: error))")
return
}
print("response = \(String(describing: response))")
let responseString = NSString(data: data!, encoding:
String.Encoding.utf8.rawValue)
print("responseString = \(String(describing: responseString))")
}
task.resume()
self.eventName = ""
self.eventDescription = ""
self.selectedStartTime = Date()
self.selectedEndTime = Date()
}
var body: some View {
Button(action: {
self.isPresentedEvent.toggle() //trigger modal presentation
}, label: {
Text("Create Event").font(.system(size: 18))
}).padding(EdgeInsets(top: 8, leading: 6, bottom: 8, trailing: 6
.sheet(isPresented: $isPresentedEvent, content:{
VStack{
TextField("Event Name", text: self.$eventName).padding()
TextField("Event Description", text: self.$eventDescription).padding()
Form {
DatePicker("When your event starts: ", selection:
self.$selectedStartTime,
in: Date()...)
}
Form {
DatePicker("When your event ends: ", selection: self.$selectedEndTime,
in:
Date()...)
}
HStack{
Button(action: {
self.isPresentedEvent.toggle()
self.annotationSelected = false
self.eventid += 1
print("Start: \(self.selectedStartTime)")
print("End: \(self.selectedEndTime)")
self.send((Any).self)
}, label: {
Text("Create Event")
})
Button(action: {
self.isPresentedEvent.toggle()
}, label: {
Text("Cancel")
})
}
Text("Create Event Button (Non Functional)").padding()
}
} )
}
}
我对 swifts 一无所知,但我使用过 flask。 从数据库中检索数据的一种简单而典型的方法是为此定义一个 API。 在此 API 中,您查询数据库(例如Select * From user Where user_id =...
),然后序列化结果(将检索到的数据从数据库转换为适合发送到客户端应用程序的形式。例如创建字典/json object) 并将响应发送给客户端。
flask 中的 API 示例
@app.route('.../get_user', methods=['GET'])
def get_user_api:
# query database
data = { 'username': username,
'level: level,
...
}
return data, 200
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