MySQL error 2034 (CR_INVALID_PARAMETER_NO) appears when a client API call passes an invalid column, parameter, or attribute index to the MySQL C client library.
MySQL Error 2034: CR_INVALID_PARAMETER_NO arises when the client library receives an invalid column or parameter index. Verify column numbers in mysql_stmt_fetch_column(), parameter numbers in mysql_stmt_send_long_data(), and key-value lengths in mysql_options4(). Correct the index or adjust the data length to resolve the issue.
Invalid parameter number The column number for mysql_stmt_fetch_column() was invalid. The parameter number for mysql_stmt_send_long_data() was invalid. A key name was empty or the amount of connection attribute data for mysql_options4() exceeds the 64KB limit.
MySQL error 2034 (CR_INVALID_PARAMETER_NO) is thrown by the MySQL client library when an application supplies an out-of-range column index, parameter number, or oversized connection attribute in a prepared-statement or connection API call.
The error never originates in the server itself. It is returned immediately by libmysqlclient, so fixing it requires reviewing client-side code or tools like Galaxy that generate the calls.
Invalid column indexes passed to mysql_stmt_fetch_column() trigger the error.
Column numbers start at 0, so requesting a column equal to or larger than the result set size fails.
Incorrect parameter numbers in mysql_stmt_send_long_data() cause the same error.
Parameters are 0-based and must not exceed the number of ? placeholders in the prepared statement.
An empty key or more than 64 KB of total attribute data fed to mysql_options4() for connection attributes also raises error 2034.
Confirm the row-column mapping with mysql_stmt_result_metadata() or run DESC in Galaxy’s editor to count result columns. Pass a column index from 0 to column_count-1.
Match each mysql_stmt_send_long_data() call to the correct parameter index.
Ensure that the total placeholders counted in your SQL equals the highest parameter index plus one.
For mysql_options4(), trim attribute blobs so the combined size is below 64 KB and ensure every key string is non-empty.
Automated code generators sometimes miscount columns after SELECT * changes. Regenerate bindings or switch to explicit column lists.
ORMs may pass long text or JSON via mysql_stmt_send_long_data().
Update the ORM version or patch the binding logic to send correct parameter indexes.
Custom telemetry that stuffs large JSON into connection attributes exceeds the 64 KB limit. Compress or truncate the payload before calling mysql_options4().
Always enumerate columns in SQL to lock result ordering. Galaxy’s AI copilot can rewrite SELECT * into explicit columns automatically.
Use prepared-statement helpers that validate index ranges at compile time.
In C, wrap the API with functions that assert index < count.
Keep connection attributes small and meaningful. Monitor attribute sizes in staging to catch breaches before production rollout.
Error 2031 (CR_MALFORMED_PACKET) surfaces when packet sizes or formats are invalid. Unlike 2034, it involves malformed protocol data rather than bad indexes.
Error 2006 (CR_SERVER_GONE_ERROR) means the server closed the connection. Check network health and server logs rather than client parameter indexes.
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Run SHOW COLUMNS FROM table or let Galaxy display metadata. Columns are zero-based when used in the C API.
No. The error is raised client-side before any query reaches the server, so performance remains unaffected.
Many ORMs wrap the C API and will surface the error as an exception. You still need to fix the underlying index mismatch.
Upgrades rarely fix index-based errors, but newer versions include clearer messages that speed debugging.
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