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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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@ -83,7 +83,7 @@ namespace FreeSql.MySql
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if (callExp.Method.DeclaringType.IsNumberType()) return "rand()";
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break;
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case "ToString":
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if (callExp.Object != null) return $"cast({getExp(callExp.Object)} as char)";
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if (callExp.Object != null) return callExp.Arguments.Count == 0 ? $"cast({getExp(callExp.Object)} as char)" : null;
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break;
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}
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@ -385,7 +385,7 @@ namespace FreeSql.MySql
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break;
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case "Equals": return $"({left} = {getExp(exp.Arguments[0])})";
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case "CompareTo": return $"timestampdiff(microsecond,{args1},{left})";
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case "ToString": return $"date_format({left}, '%Y-%m-%d %H:%i:%s.%f')";
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case "ToString": return exp.Arguments.Count == 0 ? $"date_format({left}, '%Y-%m-%d %H:%i:%s.%f')" : null;
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}
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}
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return null;
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