C# Dapper UPPER 函数

Question

我正在使用 Dapper C# .Net Core 6.0 MVC

查询；

 var query = $"SELECT d.Id,d.CityId,d.CountryId,UPPER(d.Name) FROM District as d INNER JOIN City as c ON d.CityId = c.Id Where c.Id={Convert.ToInt32(id)}";
 var result = conn.Query<CityDto>(query).ToList();

数据获取但 d.Name 的值为空

当我在 SQL 服务器

中执行它时它有效

我的错误在哪里？

Answer 1

Dapper关心列名，UPPER(d.Name)为匿名列；考虑使用 as 作为列的别名：

var result = conn.Query<CityDto>(@"
SELECT d.Id, d.CityId, d.CountryId, UPPER(d.Name) as [Name]
FROM District as d
INNER JOIN City as c ON d.CityId = c.Id
Where c.Id=@id", new { id }).AsList();

注意我还修复了参数用法。

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