In Entity Framework 6 the delete action is Remove. Here is an example Customer customer = new Customer () { Id = id }; context.Customers.Attach(customer); context.Customers.Remove(customer); context.SaveChanges();
Configure SerlvetContextListener and override contextInitilized() in your web application description , web.xml <web-app …> <listener> <listener-class>com.someCompany.AppNameServletContextListener</listener-class> </listener> </web-app package com.someCompany; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; public class AppNameServletContextListener implements ServletContextListener{ @Override public void contextDestroyed(ServletContextEvent arg0) { System.out.println(“ServletContextListener destroyed”); } @Override public void contextInitialized(ServletContextEvent arg0) { System.out.println(“ServletContextListener started”); // do the things here } }
First, see if your server is not returning blank response: response.getEntity().getContentLength(); //it should not be 0 Second, try the following to convert response into string: StringBuilder sb = new StringBuilder(); try { BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent()), 65728); String line = null; while ((line = reader.readLine()) != null) { sb.append(line); } } catch (IOException … Read more
The issue can be a conflict between a java version and a javaassist version. If you’re using the java 8 on your server you should make sure to use the latest javassist version as well. This blog shows the origin of a conflict being inside the thymeleaf which pulls in an older javassist, the solution … Read more
EF Core 3.0 supports entity.HasCheckConstraint() now. To take Ryan’s example: protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<SomeTable>(entity => entity.HasCheckConstraint(“CK_SomeTable_SomeColumn”, “[SomeColumn] >= X”); }
Given the table definition: CREATE TABLE webuser( idwebuser SERIAL PRIMARY KEY, … ) Use the mapping: @Entity @Table(name=”webuser”) class Webuser { @Id @SequenceGenerator(name=”webuser_idwebuser_seq”, sequenceName=”webuser_idwebuser_seq”, allocationSize=1) @GeneratedValue(strategy = GenerationType.SEQUENCE, generator=”webuser_idwebuser_seq”) @Column(name = “idwebuser”, updatable=false) private Integer id; // …. } The naming tablename_columname_seq is the PostgreSQL default sequence naming for SERIAL and I recommend that you … Read more
It requires two steps (second is maybe optional, but I always like clean solution) In Explorer open folder where your project resides. Open packages.config using Notepad. Find and remove the line that mentions corrupted package name. Open folder where your solution resides. Open subfolder “packages”. Find folder with corrupted package and remove it. Note: If … Read more
First off, I’m assuming you have read the article “Multithreading and the Entity Framework” on MSDN. Solution #1 is almost certainly the safest from a threading perspective, since you are guaranteeing that only one thread is interacting with the context at any give time. There is nothing inherently wrong with keeping the context around- it … Read more
The definition of these terms is quite ambiguous. You will find different definitions at different places. Entity: An entity represents a single instance of your domain object saved into the database as a record. It has some attributes that we represent as columns in our tables. Model: A model typically represents a real world object … Read more
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