[英]Unable to run update statement using Dapper (parameters error)
I am trying to update a row using Dapper but I am having error on specifying parameters in my update statement 我试图使用Dapper更新一行,但我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.
Repository.cs 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 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; }
}
I am using iDB2Connection
to access an IBM ISeries Database. 我正在使用
iDB2Connection
访问IBM ISeries数据库。
Workaround 1 解决方法1
What I did was to name parameters such that their order stays the same regardless of Dapper's alphabetical ordering. 我所做的是命名参数,使得无论Dapper的字母顺序如何,它们的顺序保持不变。
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 });
}
If someone knows a better solution. 如果有人知道更好的解决方案。 please post in this thread.
请在这个帖子中发帖。
Just try like this in your Repository.cs
file 只需在
Repository.cs
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
});
}
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