EF Core 3.1中的SqlQuery <T>等效项

时间:2020-09-26 23:05:06

标签: entity-framework-core ado.net .net-core-3.1 entity-framework-core-3.1

我正在从ASP.NET Framwork 4.7迁移到Asp .NET Core 3.1,并且确实陷入了以下困境:

我有一个SQL查询:

string Query=" 
SELECT I.Id,I.Combokod,I.S_Omr,I.Date,M.Price,M.Name,M.Dmedel,M.Year,M.Miles 
    FROM dbo.Itemannounces AS I  
    INNER JOIN dbo.MotorDBs AS M ON I.MotorDBs_Id=M.Id  where M.MotorID=1" ;

我的自定义班级:

public class Fordonlista
        {
        public int Id { get; set; }
        public byte Combokod { get; set; }
        public byte Affarsform { get; set; }
        public byte Model { get; set; }
        public byte Dmedel { get; set; }
        public short Year { get; set; }
        public int Miles { get; set; }
        public short S_Omr { get; set; }
        public DateTime Date { get; set; }
        public int Price { get; set; }
        public string Name { get; set; }
        public string Lan { get; set; }
        public string Kommun { get; set; }
        public byte Typ { get; set; }
        }

为了检索数据,我使用:

var result = Context.Database.SqlQuery<Fordonlista>(Query).ToList(); 

问题是如何在EF Core中获得结果?如果EF核心轻巧,为什么还要从Framwork迁移到降级的EF核心呢?

1 个答案:

答案 0 :(得分:0)

您可以为此使用新的 EF Core 3 方法 FromSqlRaw()
在你的例子中,那将是

string Query=" 
    SELECT I.Id,I.Combokod,I.S_Omr,I.Date,M.Price,M.Name,M.Dmedel,M.Year,M.Miles 
    FROM dbo.Itemannounces AS I  
    INNER JOIN dbo.MotorDBs AS M ON I.MotorDBs_Id=M.Id
    where M.MotorID=1" ;
var result = Context.Fordonlista.FromSqlRaw(Query);

但更好的是传递如下参数:

int motorId = 1; //or passed in from other variable
var result = Context.Fordonlista.FromSqlInterpolated(
    $"SELECT I.Id,I.Combokod,I.S_Omr,I.Date,M.Price,M.Name,M.Dmedel,M.Year,M.Miles
      FROM dbo.Itemannounces AS I  
      INNER JOIN dbo.MotorDBs AS M ON I.MotorDBs_Id=M.Id
      WHERE M.MotorID={motorId}";