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## v0.9.16
- 增加 BaseRepository.AttachOnlyPrimary 方法,只附加实体的主键值; > 在更新前使用可实现不查询数据库再更新、也可以实现更新时不更新值为 null 的字段 ```csharp class T { public int id { get; set; } public string name { get; set; } public string other { get; set; } } var item = new T { id = 1, name = "xx" }; fsql.GetRepository<T>().AttachOnlyPrimary(item).Update(item); //只更新 name ``` - 修复 Lambda 表达式中 DateTime.Now.ToString("yyyyMMdd") 不能直接执行的 bug;
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@ -37,9 +37,13 @@ namespace FreeSql.Tests
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repos.Attach(item);
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item.Title = "xxx";
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repos.Update(item);
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repos.Update(item); //<2F><><EFBFBD><EFBFBD>ִ<EFBFBD><D6B4> UPDATE "AddUpdateInfo" SET "Title" = 'xxx' WHERE("Id" = '1942fb53-9700-411d-8895-ce4cecdf3257')
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Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(item));
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repos.Update(item); //<2F><><EFBFBD>в<EFBFBD>ִ<EFBFBD><D6B4> SQL<51><4C>δ<EFBFBD>仯
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repos.AttachOnlyPrimary(item).Update(item); //<2F><><EFBFBD>и<EFBFBD><D0B8><EFBFBD>״ֵ̬<CCAC><D6B5>ֻ<EFBFBD><D6BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD>ڣ<EFBFBD>ִ<EFBFBD>и<EFBFBD><D0B8><EFBFBD> set title = xxx
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Console.WriteLine(repos.UpdateDiy.Where(a => a.Id == item.Id).Set(a => a.Clicks + 1).ToSql());
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repos.UpdateDiy.Where(a => a.Id == item.Id).Set(a => a.Clicks + 1).ExecuteAffrows();
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