五、SQLSugar 配置实体（CodeFirstDBFirst）

配置实体 - SqlSugar 5x - .NET果糖网https://www.donet5.com/Home/Doc?typeId=1182一、Nuget 引入 SqlSugarCore

二、新建实体

using SqlSugar;namespace Model.DBEntity
{/// <summary>/// 国家地区表/// </summary>[SugarTable("Country")]//当和数据库名称不一样可以设置表别名 指定表明public class Country{/// <summary>/// 自增主键ID,可给多个字段设置主键达到双主键、复合主键、联合主键、多个主键/// </summary>[SugarColumn(IsPrimaryKey =true, IsIdentity = true,ColumnDescription="主键")]//设置主键，设置自增，字段注释public int FID { get; set; }/// <summary>/// 上级ID/// </summary>[SugarColumn(ColumnName = "FPID", ColumnDescription = "上级主键")]//数据库列名与实体不一样，指定数据库字段名public int FPID { get; set; }/// <summary>/// 名称/// </summary>[SugarColumn(ColumnDescription = "名称")]public string? FName { get; set; }/// <summary>/// 递归自己/// </summary>[SugarColumn(IsIgnore =true, ColumnDescription = "下级集合")]//IsIgnore	ORM不处理该列 【忽略】public List<Country>? CountryList { get; set; }}
}

三、同步到数据库，控制台代码

using DBSyncTool;
using SqlSugar;
using System.Reflection;// See https://aka.ms/new-console-template for more information//数据库账号密码
string user = "sa";
string pwd = "***";
//
//string user = "yfl";
//string pwd = "ydl..yfl";//打印方法
var Begin = () => Console.WriteLine("┌──────────────────────────────────────────────────────────┐");
var Content = (string context) => Console.WriteLine(@$"│ {context} ");
var End = () => Console.WriteLine("└──────────────────────────────────────────────────────────┘");
var All = (string context) =>
{Begin();Content(context);End();
};
var ReStart = () =>
{for (int i = 0, m = 1; i < 30; i++)for (int l = 0; l < new[] { 5, 6, 7, 6, 8, 10, 3, 10, 4, 13, 1, 13, 1, 87, 1, 27, 4, 23, 7, 20, 11, 16, 16, 11, 20, 7, 24, 3, 27, 1 }[i]; l++, m++)Console.Write((i % 2 > 0 ? "love"[m % 4] : ' ') + (m % 29 > 0 ? "" : "\n"));Console.WriteLine();
};//数据库操作类型
string[] _syncarr = { "DBFirst", "CodeFirst", "AddDataBase", "Back" };//获取的到数据库列表
Fun f = new();
List<string> _dbarr = global::DBSyncTool.Fun.GetDBList(user, pwd);All("请谨慎做出你的选择，因为这是不可撤销的");
All("CodeFirst需自行代码调整需要同步的Table");
ChooseDB:
Begin();
Content("请选择数据库名称：");
int inx = 0;
foreach (string s in _dbarr)
{Content(@$"{++inx}:{s}");
}
End();int? dbstr = 0;
Wdb:
try
{dbstr = Convert.ToInt32(Console.ReadLine()) - 1;while (dbstr >= _dbarr.Count || dbstr < 0){All("请输入有效的数据库编号！ ");dbstr = Convert.ToInt32(Console.ReadLine()) - 1;}
}
catch (Exception)
{All("请输入有效的数据库编号！ ");goto Wdb;
}Begin();
Content(@$"【{_dbarr[(int)dbstr]}】");
Content("请选择数据库结构同步方式：");
inx = 0;
foreach (string s in _syncarr)
{Content(@$"{++inx}:{s}");
}
End();int? type = 0;
Wsync:
try
{type = Convert.ToInt32(Console.ReadLine()) - 1;while (type >= _syncarr.Length || type < 0){Content(@$"【{_dbarr[(int)dbstr]}】");All("请输入有效的同步方式编号！");type = Convert.ToInt32(Console.ReadLine()) - 1;}
}
catch (Exception)
{Content(@$"【{_dbarr[(int)dbstr]}】");All("请输入有效的同步方式编号！");goto Wsync;
}string? sure = "";
if (_syncarr[(int)type] == "Back")
{ReStart();goto ChooseDB;
}
else
{Begin();Content($@"请确认您选择的数据库同步方式：【{_dbarr[(int)dbstr]}】【{_syncarr[(int)type]}】");Content("1 : 确认！开始同步");Content("2 : 错误！重新选择");End();sure = Console.ReadLine();
}while (string.IsNullOrEmpty(sure) || (sure != "1" && sure != "2"))
{Content(@$"【{_dbarr[(int)dbstr]}】【{_syncarr[(int)type]}】");All("请重新输入有效的值！");sure = Console.ReadLine();
}if (sure == "1")
{SqlSugarClient Db = new(new ConnectionConfig(){ConnectionString = @$"Server=.;User Id={user};Password={pwd};Database={_dbarr[(int)dbstr]}",//数据库链接字符串DbType = DbType.SqlServer,//指定数据库类型IsAutoCloseConnection = true,//链接使用完后是否自动释放InitKeyType = InitKeyType.Attribute,//从实体特性中读取主键自增列信息ConfigureExternalServices = new ConfigureExternalServices(){EntityNameService = (type, entity) =>{entity.IsDisabledDelete = true;//全局禁止删除列}}});All("开始同步！请勿关闭程序...  ");switch (_syncarr[(int)type]){case "DBFirst":// 应用程序所在目录，即bin/debug//方法1、Environment.CurrentDirectory 取得或设置当前工作目录的完整限定路径//方法2、AppDomain.CurrentDomain.BaseDirectory 获取基目录，它由程序集冲突解决程序用来探测程序集DirectoryInfo exePath = new(Environment.CurrentDirectory);string pathFullName = exePath.Parent.Parent.Parent.FullName;//项目所在目录，即项目最外层目录Db.DbFirst.IsCreateAttribute().CreateClassFile(@$"{pathFullName}\\Model\\DBEntity", "Model.DBEntity");//文件地址，指定实体命名空间break;case "CodeFirst":Type[] types = Assembly.LoadFrom("DBSyncTool.dll")//如果 .dll报错，可以换成 xxx.exe 有些生成的是exe .GetTypes().Where(it => it.FullName.Contains("Model.DBEntity"))//命名空间过滤，当然你也可以写其他条件过滤.ToArray();//断点调试一下是不是需要的Type，不是需要的在进行过滤//同步数据表结构Db.DbMaintenance.CreateDatabase();Db.CodeFirst.SetStringDefaultLength(1024).InitTables(types);//多表同步break;case "AddDataBase":string? dbs = "";WDBS:Content(@$"请输入要新增的数据库名称");dbs = Console.ReadLine();if (string.IsNullOrEmpty(dbs)){All("请重新输入有效的值！");goto WDBS;}Db = new(new ConnectionConfig(){ConnectionString = @$"Server=.;User Id={user};Password={pwd};Database={dbs}",//数据库链接字符串DbType = DbType.SqlServer,//指定数据库类型IsAutoCloseConnection = true,//链接使用完后是否自动释放InitKeyType = InitKeyType.Attribute,//从实体特性中读取主键自增列信息});Db.DbMaintenance.CreateDatabase();break;}
}
else
{ReStart();goto ChooseDB;
}
All("...   ...   ...");
All("结束同步！已自动关闭程序...");
Console.ReadKey();

！！！请注意如下图中对应的命名空间和文件夹名称