fix(mysql): validate parameter count for prepared statements #3857
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Add validation to ensure the number of provided parameters matches the expected count for MySQL prepared statements. This prevents protocol errors by returning an error if the counts do not match before sending the statement for execution.
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joeydewaal
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Jun 23, 2025
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| if arguments.types.len() != metadata.parameters { | ||
| return Err(Error::Protocol(format!( | ||
| "Prepared statement expected {} parameters but {} parameters were provided", | ||
| metadata.parameters, | ||
| arguments.types.len() | ||
| ))); | ||
| } |
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I'm not a maintainer but there is the err_protocol macro from sqlx-core which can be used here.
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| if arguments.types.len() != metadata.parameters { | ||
| return Err(Error::Protocol(format!( | ||
| "Prepared statement expected {} parameters but {} parameters were provided", | ||
| metadata.parameters, | ||
| arguments.types.len() | ||
| ))); | ||
| } |
Replace direct Error::Protocol(format!()) calls with err_protocol! macro in MySQL connection executor.
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Does your PR solve an issue?
fixes #3774
Is this a breaking change?
No. This PR adds proper error handling when the number of parameters provided doesn't match the number expected by a prepared statement in MySQL.