An exception "This MySqlConnection is already in use" occurs when calling the QuerySingleOrDefault method
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- Dominant language
- C#
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Description
An exception "This MySqlConnection is already in use" occurs when calling the QuerySingleOrDefault method of dapper in a long-running loop in TransactionScope, which does not cross threads and is not nested
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No file, test, or reproduction is provided. Start by reproducing the long-running loop using MySqlConnection, QuerySingleOrDefault, and TransactionScope, then trace the connection-use path in Dapper and the MySQL provider. Done means identifying a reproducible cause and documenting or testing the corrected behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, mysql
- Domain
- database
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100