WPF实战学习笔记08-创建数据库

创建数据库

创建文件夹

./Context

创建文件

./Context/BaseEnity.cs

./Context/Memo.cs

./Context/MyTodoContext.cs

./Context/Todo.cs

./Context/User.cs

创建数据对象

• ./Context/BaseEnity.cs

  namespace MyToDo.Api.Context
  {
      public class BaseEnity
      {
          public int Id { get; set; }
          public DateTime CreateDate { get; set; }
          public DateTime UpdateDate { get; set; }
      }
  }
  

• ./Context/Memo.cs

  namespace MyToDo.Api.Context
  {
      public class Memo:BaseEnity
      {
          public string Title { get; set; }
  
          public string Content { get; set; }
  
      }
  }
  
  

• ./Context/MyTodoContext.cs

  创建数据库DbSet

  using Microsoft.EntityFrameworkCore;
  
  namespace MyToDo.Api.Context
  {
      public class MyTodoContext:DbContext
      {
          public MyTodoContext(DbContextOptions options) : base(options) { }
  
          public DbSet TodoSet { get; set; }
          public DbSet UserSet { get; set; }
          public DbSet MemoSet { get; set; }
      }
  }
  

• ./Context/Todo.cs

  namespace MyToDo.Api.Context
  {
      public class Todo:BaseEnity
      {
          public string Title { get; set; }
  
          public string Content { get; set; }
  
          public int Status { get; set; }
      }
  }
  

• ./Context/User.cs

  namespace MyToDo.Api.Context
  {
      public class User:BaseEnity
      {
          public string Account { get; set; } 
  
          public string UserName { get; set; }
  
          public string Password { get; set; }
      }
  }
  

添加nuget包

• Microsoft.EntityFrameworkCore.Design

  Shared design-time components for Entity Framework Core tools.

• Microsoft.EntityFrameworkCore.Sqlite

  SQLite database provider for Entity Framework Core.

• Microsoft.EntityFrameworkCore.Tools

  Entity Framework Core Tools for the NuGet Package Manager Console in Visual Studio.

  Enables these commonly used commands:
  Add-Migration
  Bundle-Migration
  Drop-Database
  Get-DbContext
  Get-Migration
  Optimize-DbContext
  Remove-Migration
  Scaffold-DbContext
  Script-Migration
  Update-Database

配置连接字符串

• appsettings.json

{
  "ConnectionStrings": {
    "TodoConnection": "Data Source=todo.db"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*"
}

配置数据库连接选项

• program.cs

builder.Services.AddDbContext(option =>
{
    var constr = builder.Configuration.GetSection("ConnectionStrings")["TodoConnection"];
    option.UseSqlite(constr);
});
var app = builder.Build();
	

启动配置数据库

[工具]-> [Nuget包管理器]-> [程序包管理器控制台]

1. 输入 ：Add-Migration mytodo

   生成数据库配置项文件

2. 输入 ：Update-Database

   将数据库更新到sqlite数据库中，制成sqlite数据库文件