Error parsing column 0 (Id=012eb03d-fa6c-4b00-a767-c3fef46a0325 - String) - SqlLite
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Description
Dear,
I'm getting this error when using Dapper to retrieve data from a table that is in SqlLite, in SqlMapper.cs, line 3911
An unhandled exception occurred while processing the request.
AggregateException: One or more errors occurred. (Error parsing column 0 (Id=012eb03d-fa6c-4b00-a767-c3fef46a0325 - String))
System.Threading.Tasks.Task.ThrowIfExceptional(bool includeTaskCanceledExceptions)
DataException: Error parsing column 0 (Id=012eb03d-fa6c-4b00-a767-c3fef46a0325 - String)
Dapper.SqlMapper.ThrowDataException(Exception ex, int index, IDataReader reader, object value) in SqlMapper.cs, line 3911
Query
string q = "SELECT e.Id, e.Name, e.EmailAddress" +
" FROM EmailEmailList eel" +
" INNER JOIN Email e ON eel.EmailId = e.Id" +
" INNER JOIN EmailList el ON eel.EmailListId = el.Id" +
" WHERE el.Id = 1";
var x = _DBContext.Database.GetDbConnection().Query(q);
Class
public class Email
{
public Guid Id { get; set; } = Guid.NewGuid();
public String? Name { get; set; }
public string EmailAddress { get; set; } = null!;
public ICollection? EmailList { get; set; }
}
public class EmailEmailList
{
public Guid EmailId { get; set; }
public int EmailListId { get; set; }
}
public class EmailList
{
public int Id { get; set; }
public string Name { get; set; } = null!;
public string? Type { get; set; }
public virtual ICollection Email { get; set; } = null!;
}
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Research direction
Start at SqlMapper.cs line 3911 and reproduce the reported Query call against the SQLite tables and Guid-valued Id. Trace how the first column is read and mapped, then check whether existing tests cover this conversion; done should identify a reproducible Dapper issue or establish that the behavior belongs to the SQLite provider or schema.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, sqlite
- Domain
- databases
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100