DapperLib / DapperLib/Dapper

SQLite TypeHandler not called

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Dominant language
C#
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Description

Used the following handler with SQL-Server, works as expected.

public class DateOnlyTypeHandler : SqlMapper.TypeHandler<DateOnly>
{
    public override void SetValue(IDbDataParameter parameter, DateOnly date)
    {
        parameter.Value = date.ToString("yyyy-MM-dd");
    }

    public override DateOnly Parse(object value)
        => DateOnly.FromDateTime((DateTime)value);
}

Setup

internal class DapperOperation
{

    private readonly IDbConnection _cn;

    public DapperOperation()
    {
        _cn = new SqlConnection(ConnectionString());
        SqlMapper.AddTypeHandler(new SqlDateOnlyTypeHandler());
    }

Problem

Tried this with SQLite.Core with SQLiteConnection and neither SetValue nor Parse are executed which I learned by a) inspecting values sent to the database b) setting breakpoints.

  • Dapper 2.1.44
  • System.Data.SQLite.Core 1.0.118
  • VS2022 17.9.2
  • NET8

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the report with SQLiteConnection and the DateOnlyTypeHandler registered through SqlMapper.AddTypeHandler. Trace SetValue and Parse while comparing the SQLite behavior with the reported SQL Server behavior; done means both handler callbacks are invoked as expected for SQLite.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp, sqlite
Domain
database
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
38/100

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