crud

问题 I'm building create, update and delete operations in my app that uses Firebase. Regarding this answer on a question about the difference between set() and update() , @jmk2142 suggested that creating, updating and deleting an item in firebase could all be done with update() . Apart from semantics / understanding the purpose of the code, is there any good reason NOT to use update() for all of these? 回答1: If you want to replace the entire value in a location, you'll want to use set() . If you

问题 I like XmlSerializer , because of its fire-and-forget operation. I can give XmlSerializer the object to serialize and the file to serialize to, and XmlSerializer will sort out the property names and values. XmlWriter xmlWriter = XmlWriter.Create(projectPath + "\\" + m_projectDescriptionFileName); // create new project description file (XML) XmlSerializer xmlSerializer = new XmlSerializer(typeof(CustomerContactInfoViewModel)); xmlSerializer.Serialize(xmlWriter, contactInfo); xmlWriter.Close();

问题 Am working on a Single page Application built using Angular 8 on the frontend and Laravel on the backend. It is a CRUD application, on the delete functionality, it is working well by deleting the user of the specific id on the database. After the user of the specific id is deleted, am fetching all the products from the database but I want to update the data on the U.I afresh with the new data (excluding the deleted resource). Kindly assist? Show.component.ts file import { Component, OnInit ,

问题 I am having some trouble doing a one to one relationship with user_info table and userImage table. When I try to upload my image, it didn't save into my database and it user_id is 0. I managed to successfully do a one to many and one to one relationship in the past but not with CRUD together. Can anyone help me? Best to give me some example for me to refer or advice on what should I do. Thanks in advance Here are my current codes: createController: public function create1(){ return view(

问题 I am very new to Play and Java (i come from a Python and Django background :) ). I am trying to connect to MYSQL database and read values from it. However, after trying for about few frustrating hours i am unable to do so. Please Help. My build.sbt has the dependency added: "mysql" % "mysql-connector-java" % "5.1.18" My Application.conf file is as (the relevant section) db.default.driver=com.mysql.jdbc.Driver db.default.url="jdbc:mysql://127.0.0.1:3306/myDBName" db.default.user="root" db

问题 I have a SQLite Database with is populating my Spinner. The "add" functionality it's working good! What I wanna do is when user clicks in on spinner item he can change the following field and update in the Database My Spinner database public class SpinnerDatabase extends SQLiteOpenHelper{ private SQLiteDatabase db; private static final int DATABASE_VERSION = 1; private static final String DATABASE_NAME = "spinnerDB"; private static final String TABLE_LABELS = "labels"; private static final

问题 Hi I'm very new to PHP because I just started learning this 2 days ago! I'm trying to display my second table properly in my index.html file but I get this error: Invalid argument supplied for foreach() Take a look Any help would be much appreciated Class public class Category { public int Id{get;set;} public string Name {get;set;} } public class Product{ public int Id{get;set;} public int CategoryId{get;set;} public String Brand {get;set;} public String Name {get;set;} public decimal Price

问题 I'm stuck at a bit of a quandary trying to figure out the best way of structuring my CRUD tests. Within my application users have the ability to create several types of 'tasks'. My currently implementation looks something like the following: Scenario: Create Task-Type A Given I am on a user's profile page And Have access to create tasks When I create a new task with a unique title and description Then The confirmation prompt should display Scenario: Read the Task-Type A Given A new task was

问题 I know you should use POST whenever data will be modified on a public website. There are several reasons including the fact that search engines will follow all the links and modify the data. My question is do you think it is OK to use GET behind authenticated pages in something like an admin interface? One example would be a list of products with a delete link on each row. Since the only way to get to the page is if you are logged in, is there any harm in just using a link with the product ID

问题 I am trying to make an Ajax GridView using Pjax with delete button. Deleting goes with no Ajax. I am new to Yii2 so any help would be appreciated. Thank you. index.php <?php Pjax::begin(['id' => 'countries']) ?> <?= GridView::widget([ 'dataProvider' => $dataProvider, 'columns' => [ ['class' => 'yii\grid\SerialColumn'], 'id', 'title', ['class' => 'yii\grid\ActionColumn', 'buttons' => [ 'delete' => function ($url, $model, $key) { return Html::a('<span class="glyphicon glyphicon-trash"></span>',