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@@ -1,4 +1,6 @@
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using Microsoft.AspNetCore.Mvc.Filters;
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using CloudBuilder.Core.Service;
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Mvc.Filters;
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using Microsoft.EntityFrameworkCore;
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using System;
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using System.Collections.Generic;
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@@ -10,7 +12,8 @@ using System.Transactions;
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namespace CloudBuilder.Core.DatabaseAccessor
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{
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/*
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事务范围不匹配:TransactionScope 管理的是分布式事务,但对于单个数据库连接,通常不需要分布式事务。
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事务范围:TransactionScopeOption.RequiresNew 管理的是分布式事务,
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TransactionScopeOption.Required但对于单个数据库连接,通常不需要分布式事务。
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OnActionExecutionAsync 是 ASP.NET Core 中异步的 Action 过滤器执行方法。
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// OnActionExecuting: Action 执行前
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[开始事务]
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@@ -19,6 +22,7 @@ namespace CloudBuilder.Core.DatabaseAccessor
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↓
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// OnActionExecuted: Action 执行后(无论是否异常)
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[检查异常]
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//Controller对象不抛出异常,返回的是异常对象ValidatedException、ServiceErrorException(方便前端信息统一处理)
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[提交或回滚事务]
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*/
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[AttributeUsage(AttributeTargets.Method)]
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@@ -38,15 +42,59 @@ namespace CloudBuilder.Core.DatabaseAccessor
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base.OnActionExecuting(context);
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}
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//public override void OnActionExecuting(ActionExecutingContext context)
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//{
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// // 正确:单机数据库事务(不是分布式)
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// _transactionScope = new TransactionScope(
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// TransactionScopeOption.Required,
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// new TransactionOptions
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// {
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// IsolationLevel = IsolationLevel.ReadCommitted
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// },
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// TransactionScopeAsyncFlowOption.Enabled); // 必须加这个
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// base.OnActionExecuting(context);
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//}
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public override void OnActionExecuted(ActionExecutedContext context)
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{
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if (_transactionScope != null)
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if (_transactionScope == null)
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{
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if (context.Exception == null)
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base.OnActionExecuted(context);
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return;
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}
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bool needRollback = false;
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try
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{
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// ==============================================
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// 核心逻辑:判断返回值是不是异常对象
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// ==============================================
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if (context.Result is ObjectResult objectResult)
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{
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var value = objectResult.Value;
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if (value != null)
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{
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// 只要是这两个异常 → 必须回滚
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if (value is ValidatedException || value is ServiceErrorException)
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{
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needRollback = true;
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}
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}
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}
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// 如果没有异常,才提交
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if (!needRollback)
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{
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//必须要有 SaveChanges() 调用,否则数据只会停留在内存中,不会真正保存到数据库。
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_transactionScope.Complete();
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}
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}
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finally
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{
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// 不 Complete() 就是自动回滚
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_transactionScope.Dispose();
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}
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