.NET 9.0 的 Blazor Web App 项目中 EF Core 【事务】使用备忘

一、DbContext.Database.BeginTransactionAsync() 模式

1. 注意事项:连接字符串中启用了 MARS(Multiple Active Result Sets:MultipleActiveResultSets=True )后,无法创建 保存点(保存点与 SQL Server 的多重活动结果集不兼容),此时,使用注入的 DbContext(例如:@inject ApplicationDbContext FirstDb) 将报错。解决办法:在 事务 中自己 new 一个 DbContext。

cs 复制代码
  "ConnectionStrings": {
    "Ky1SqlServerConnection": "Server=localhost;Database=kyglxt;Trusted_Connection=True;MultipleActiveResultSets=True;TrustServerCertificate=True;User=sa;Password=123456",
    "Ky2SQLiteConnection": "Data Source=SQLiteFile.db",
  }

上述语句为 appsettings.json 中保存的 连接字符串。

cs 复制代码
/* SQL Server 事务测试 ------ ok
*  注:Multiple Active Result Sets(MARS) is enabled:MultipleActiveResultSets = True; 时,不能使用注入的 DbContext,在 事务 中自己 new 一个 DbContext。*/
try
{
    using (var FirstDb = new KyglxtContext(new DbContextOptionsBuilder<KyglxtContext>().UseSqlServer(AppsettingsJsonService.Configuration["ConnectionStrings:Ky1SqlServerConnection"]).Options))
    {
        var transaction = await FirstDb.Database.BeginTransactionAsync();

        var FirstDbEntity01 = new 用户表 { 用户名 = $"Entity in FirstDb:{DateTime.Now}" };
        FirstDb.Add(FirstDbEntity01);
        await FirstDb.SaveChangesAsync();

        System.Console.WriteLine("------------save 1,end");

        await Task.Delay(2000);
        System.Console.WriteLine("------------delay end");

        var FirstDbEntity02 = new 用户表 { 名称 = $"Entity in FirstDb:{DateTime.Now}" };
        FirstDb.Add(FirstDbEntity02);
        await FirstDb.SaveChangesAsync();

        System.Console.WriteLine("------------save 2,end");

        // Commit transaction if all commands succeed, transaction will auto-rollback when disposed if either commands fails
        await transaction.CommitAsync();

        System.Console.WriteLine("------------try,ok");
    }
}
catch (Exception ex)
{
    System.Console.WriteLine(ex.Message);
    System.Console.WriteLine(ex.InnerException?.Message);
}
finally { }

2. 对于 环境事务(TransactionScope) ,SQLite 不支持,针对多个数据库使用 事务 功能时,不能包含 SQLite。解决办法1:生产环境,SQLite 换成 SQL Server 。解决办法2:手动处理。

cs 复制代码
 /* 手动处理 多个数据库,支持 SQLite */
 try
 {
     using var FirstDb = new KyglxtContext(new DbContextOptionsBuilder<KyglxtContext>().UseSqlServer(AppsettingsJsonService.Configuration["ConnectionStrings:Ky1SqlServerConnection"]).Options);
     using var SecondDb = new ApplicationDbContext(new DbContextOptionsBuilder<ApplicationDbContext>().UseSqlite(AppsettingsJsonService.Configuration["ConnectionStrings:Ky2SQLiteConnection"]).Options);

     var FirstTransaction = await FirstDb.Database.BeginTransactionAsync();
     var SecondTransaction = await SecondDb.Database.BeginTransactionAsync();

     try
     {
         var firstEntity = new 用户表 { 用户名 = $"BeginTransactionAsync,2:{DateTime.Now}" };
         FirstDb.Add(firstEntity);
         await FirstDb.SaveChangesAsync();

         System.Console.WriteLine("FirstDb------------save 1,end");

         await Task.Delay(2000);
         System.Console.WriteLine("BeginTransactionAsync,2------------------------delay end");

         var secondEntity = new ApplicationUser { UserName = $"BeginTransactionAsync,2:{DateTime.Now}" };
         SecondDb.Add(secondEntity);
         await SecondDb.SaveChangesAsync();

         System.Console.WriteLine("SecondDb------------save 2,end");

         await FirstTransaction.CommitAsync();
         await SecondTransaction.CommitAsync();

         System.Console.WriteLine("BeginTransactionAsync,2------------------try,ok");
     }
     catch (Exception ex)
     {
         await FirstTransaction.RollbackAsync();
         await SecondTransaction.RollbackAsync();

         System.Console.WriteLine($"BeginTransactionAsync,2------------------catch,{ex.Message}");
         System.Console.WriteLine($"BeginTransactionAsync,2------------------catch,{ex.InnerException?.Message}");
     }

 }
 catch (Exception ex)
 {
     System.Console.WriteLine($"BeginTransactionAsync,2------------------catch,{ex.Message}");
     System.Console.WriteLine($"BeginTransactionAsync,2------------------catch,{ex.InnerException?.Message}");
 }
 finally
 {
     System.Console.WriteLine("BeginTransactionAsync,2------------------finally:");
 }

二、环境事务,System.Transactions、TransactionScope:支持操作多个数据库

cs 复制代码
 /* 环境事务:支持操作多个数据库,但是 SQLite 不支持 TransactionScope */
 try
 {
     using (var scope = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
     {
         using (var FirstDb = new KyglxtContext(new DbContextOptionsBuilder<KyglxtContext>().UseSqlServer(AppsettingsJsonService.Configuration["ConnectionStrings:Ky1SqlServerConnection"]).Options))
         {
             var firstEntity = new 用户表 { 用户名 = $"TransactionScope:{DateTime.Now}" };
             FirstDb.Add(firstEntity);
             await FirstDb.SaveChangesAsync();

             System.Console.WriteLine("FirstDb------------save 1,end");

             await Task.Delay(2000);
             System.Console.WriteLine("TransactionScope------------------------delay end");

             using (var SecondDb = new ApplicationDbContext(new DbContextOptionsBuilder<ApplicationDbContext>().UseSqlite(AppsettingsJsonService.Configuration["ConnectionStrings:Ky2SQLiteConnection"]).Options))
             {
                 var secondEntity = new ApplicationUser { UserName = $"TransactionScope:{DateTime.Now}" };
                 SecondDb.Add(secondEntity);
                 await SecondDb.SaveChangesAsync();
             }

             System.Console.WriteLine("SecondDb------------save 2,end");
         }

         // Commit transaction if all commands succeed, transaction will auto-rollback when disposed if either commands fails
         scope.Complete();

         System.Console.WriteLine("TransactionScope------------------try,ok");
     }
 }
 catch (Exception ex)
 {
     // Handle the exception (e.g., log it)
     System.Console.WriteLine($"TransactionScope------------------catch,{ex.Message}");
     System.Console.WriteLine($"TransactionScope------------------catch,{ex.InnerException?.Message}");
 }
 finally
 {
     System.Console.WriteLine("TransactionScope------------------finally:");
 }
相关推荐
余华余华8 分钟前
计算机等级考试数据库三级(笔记3)
服务器·数据库·oracle
南風_入弦1 小时前
Oracle logminer详解
数据库·oracle·恢复
小安同学iter2 小时前
SpringBoot (二) 日志系统
数据库·spring boot·后端
Chandler242 小时前
Redis:事务
数据库·redis·缓存
InCerry2 小时前
.NET周刊【3月第3期 2025-03-16】
c#·asp.net·.net
是阿建吖!3 小时前
【MySQL】事务
数据库·mysql
Asuka074 小时前
MySQL数据库和表的操作
数据库·mysql
天上掉下来个程小白4 小时前
Redis-04.Redis常用命令-字符串常用命令
java·数据库·redis·springboot·苍穹外卖
2401_891409264 小时前
国外期货高频数据:历史高频分钟回测数据分享
数据库·金融
观无4 小时前
C# 扩展方法
开发语言·c#