c# - 无法使用 Dapper 运行更新语句（参数错误）

Question

我正在尝试使用 Dapper 更新一行，但在更新语句中指定参数时出错

An exception of type 'System.InvalidOperationException' occurred in IBM.Data.DB2.iSeries.dll but was not handled in user code
Additional information: Not enough parameters specified.  The command
requires 3 parameter(s), but only 0 parameter(s) exist in the
parameter collection.

存储库.cs

public void Update(Movie movie)
{
      var sql = "UPDATE myDB.movies set title=?, genre=? where Id=?";
      db.Execute(sql, new 
               {   movie.Title, 
                   movie.Genre, 
                   movie.ID 
               });
}

电影.cs

public class Movie
{
    public int ID { get; set; }
    [Required]
    public string Title { get; set; }

    [Required]
    [Display(Name="Release Date")]
    [DisplayFormat(DataFormatString="{0:dd/MM/yyyy}", ApplyFormatInEditMode=true)]
    public DateTime ReleaseDate { get; set; }

    [Required]
    public string Genre { get; set; }
    public decimal Price { get; set; }
}

我正在使用iDB2Connection访问 IBM ISeries 数据库。

Answer 1

解决方法 1

我所做的是命名参数，以使它们的顺序保持不变，而不管 Dapper 的字母顺序如何。

public void Update(Movie movie)
{
  var sql = "UPDATE myDB.movies set title=@param1, genre=@param2 where ID=@param3";
  db.Execute(sql, new { param1 = movie.Title, param2 = movie.Genre, param3 = movie.ID });
}

如果有人知道更好的解决方案。请在此线程中发布。

Answer 2

Repository.cs只需在您的文件中尝试这样

public void Update(Movie movie)
{
      var sql = "UPDATE myDB.movies set title=:Title, genre=:Genre where Id=:ID";
      db.Execute(sql, new 
               {  
                  Title = movie.Title, 
                  Genre = movie.Genre, 
                  ID = movie.ID 
               });
}