如何使用带有初始化程序的代码优先方法创建数据库

Question

I want to create database if is not exists in Entity framework core. We could use initializer with code first approach in Entity Framework using Database Initialization Strategies without migrations as in the link below

• CreateDatabaseIfNotExists
• DropCreateDatabaseIfModelChanges
• DropCreateDatabaseAlways

https://www.entityframeworktutorial.net/code-first/database-initialization-strategy-in-code-first.aspx

How to do this in Entity Framework Core and.Net Core 3.1

Answer 1

One way you can achieve this, is by adding the following code in your Startup.cs - Configure method

public void Configure(... ) 
{
  //....
  var context = app.ApplicationServices.GetService<YourDbContext>();

  context.Database.Migrate();

 // To Delete
 context.Database.EnsureDeleted();
}

Applies any pending migrations for the context to the database. Will create the database if it does not already exist.

Alternative, there's another pre-condition that you can use:

if(context.Database.EnsureCreated()) { // your code here...}