DapperLib / DapperLib/Dapper

Multi-mapping depends on order of columns

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Dominant language
C#
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Description

See this stack overflow for details on the issue.

I forked Dapper and created a small console app in the solution that illustrates the issue. Simply update the connection string as necessary (doesn't actually pull from it, just needs a valid connection to run) and then comment/uncomment the SQL statements to show the issue.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  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 with the linked Stack Overflow report and the forked Dapper repository's small console app. Configure a valid connection string, run the reproduction, and compare the results while commenting and uncommenting the SQL statements. Done means multi-mapping behaves consistently regardless of column order.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp, sql
Domain
databases
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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