an error is reported when using SQLite.swift to use try db.run on existing database tables (table.addColumn (title)) adds a title column. the code is as follows: create a table private func creatTable(filePath: String) { do { db = t...
what is the situation? I use multithreaded Task to grab the data. How can I save the database after capturing the data? The database is sqlite. 1. At first, I want to store the database directly in task, but in the case of multithreading, there will be...
var myDB={ name: test , version:3, db:null }; openDB(myDB.name,myDB.version); setTimeout(function(){ closeDB(myDB.db); deleteDB(myDB.name); },500); because asy...
could you tell me < input type= "file " capture= "camera " accept= "image jpeg,image gif,image jpg,image png " > what is the reason why some mobile phones in Wechat s built-in browser can t adjust the camera function on their mobile phones? ...
ordinary subclasses inherit the parent class through the extends keyword, so how do the Spring parent container and the Spring MVC child container reflect the parent-child relationship? does the container refer to a class? which class is the Spring co...
problem description I click on the content in the red box to change the background color to green, but I always report an error. I can t find the selected, in the green box on the right. LableActive is my looping array. The fields in the array are sh...
every time composer up appears this and updates it for a long time No problem if you update locally, update will appear on top of the linux service composer has also been updated and has not been resolved ...