ef core 数据迁移

1 安装 EF Core 命令行工具

安装命令 

dotnet tool install --global dotnet-ef

2 搭建好项目 entity，map，dbContext 

在项目中添加如下引用：

Microsoft.EntityFrameworkCore

Microsoft.EntityFrameworkCore.Design

Microsoft.EntityFrameworkCore.Relational

Microsoft.EntityFrameworkCore.SqlServer

3.1 添加 entities

SysUserEntity 如下

namespace ConsoleApp_EFMigration.Entities
{
    public class SysUserEntity
    {
        /// <summary>
        /// Id
        /// </summary>
        public string Id { get; set; }
        /// <summary>
        /// 用户账号
        /// </summary>
        public string UserCode { get; set; }
        /// <summary>
        /// 用户名
        /// </summary>
        public string UserName { get; set; }
    }
}

 

3.2 添加 maps

SysUserMap 如下

using ConsoleApp_EFMigration.Entities;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;

namespace ConsoleApp_EFMigration.Maps
{
    public class SysUserMap : IEntityTypeConfiguration<SysUserEntity>
    {
        public void Configure(EntityTypeBuilder<SysUserEntity> builder)
        {
            builder.ToTable("SysUser"); // 映射到表 SysUser

            builder.HasKey(c => c.Id); // 表 主键为 Id
        }
    }
}

 

3.3 添加 dbContexts

 数据库 Test 的上下文类如下

using ConsoleApp_EFMigration.Entities;
using ConsoleApp_EFMigration.Maps;
using Microsoft.EntityFrameworkCore;

namespace ConsoleApp_EFMigration.DbContexts
{
    /// <summary>
    /// 数据库 Test 上下文类
    /// </summary>
    public class TestDbContext : DbContext
    {
        public TestDbContext()
        {
            Database.EnsureCreated();
        }

        public DbSet<SysUserEntity> SysUsers { get; set; }
        public DbSet<SysRoleEntity> SysRoles { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.ApplyConfiguration(new SysUserMap());
            modelBuilder.ApplyConfiguration(new SysRoleMap());

            base.OnModelCreating(modelBuilder);
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            base.OnConfiguring(optionsBuilder);
            string connStr = "Server=****;Database=Test;Uid=sa;Pwd=****;TrustServerCertificate=True;";
            optionsBuilder.UseSqlServer(connStr); // SqlServer 数据库
        }
    }
}

 

3 在项目.csproj文件目录下，文件地址栏输入 cmd

 

  4 添加迁移 

在 cmd 窗口中输入添加迁移命令如下：

dotnet ef migrations add First

// 撤销迁移  dotnet ef migrations add AddProvinceName2 命令

dotnet ef migrations remove

5 应用迁移

在cmd窗口中执行以下迁移命令

dotnet ef database update

 

 6 查看迁移结果

 

 

 

参考链接

https://docs.microsoft.com/zh-cn/ef/core/managing-schemas/migrations/?tabs=dotnet-core-cli

https://docs.microsoft.com/zh-cn/ef/core/managing-schemas/migrations/managing?tabs=dotnet-core-cli

标签：core,ef,Microsoft,EntityFrameworkCore,dotnet,using,迁移,public
来源： https://www.cnblogs.com/tomorrow0/p/15734308.html