[英]Unable to run update statement using Dapper (parameters error)
我試圖使用Dapper更新一行,但我在更新語句中指定參數時出錯
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.
Repository.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
});
}
Movie.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
訪問IBM ISeries數據庫。
解決方法1
我所做的是命名參數,使得無論Dapper的字母順序如何,它們的順序保持不變。
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決方案。 請在這個帖子中發帖。
只需在Repository.cs
文件中嘗試這樣
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
});
}
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