MySQL error 2051 (CR_NO_DATA) means your client tried to read column values without fetching a row first, usually after using mysql_stmt_fetch or mysql_fetch_row incorrectly.
MySQL Error 2051: CR_NO_DATA occurs when a client attempts to read column data without fetching a row. Re-issue mysql_stmt_fetch (or mysql_fetch_row) before accessing columns, or check the return code to ensure a row was retrieved. Proper fetch-then-read logic fixes the problem.
Attempt to read column without prior row fetch
MySQL raises error 2051 (CR_NO_DATA) when the client library detects a request for column data even though no row is currently buffered. The client API expects every column access to be preceded by a successful fetch call.
The error is classified as a client error, so the server is healthy.
The fault lies in application flow or API misuse.
Error 2051 appears most often in C, C++, Go, or Python programs that use low-level MySQL APIs (mysql_stmt_fetch, mysql_fetch_row, Cursor.fetchone).
A missing or failed fetch leaves the internal cursor empty, and the next column read triggers CR_NO_DATA.
Calling mysql_stmt_fetch and ignoring a return value of MYSQL_NO_DATA causes subsequent mysql_stmt_bind_result reads to fail with 2051.
Loop logic that breaks prematurely after fetch, yet still tries to access column data, also triggers the error.
Always check the fetch call’s return value. Continue only when it is 0 (success).
If it is MYSQL_NO_DATA, stop reading columns.
Refactor loops so that column access occurs inside the same block where a row was confirmed.
Prepared statements: Call mysql_stmt_fetch, verify the return code, then read bound variables.
Skipping this check is the top cause of 2051.
Language bindings: In Python’s mysql-connector, call cursor.fetchone() and ensure the result is not None before reading elements.
Enable strict error checking in your IDE to flag unused return values from fetch APIs.
Use high-level libraries (e.g., SQLAlchemy, Galaxy SQL editor) that abstract fetch logic and guard against premature column reads.
CR_INVALID_BUFFER_USE (2053) occurs when buffer pointers are out of sync - fix by matching bind and fetch calls.
ER_NO_DATA (100) is a server SQLSTATE returned for SELECT statements that find no rows; handle it at query level rather than client fetch level.
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You likely skipped mysql_stmt_bind_result or used an exhausted cursor. Bind result buffers before the first fetch and verify the query executed successfully.
It is purely a client-side issue. The MySQL server completed the query; the client mismanaged fetch logic.
No. Prepared statements still require explicit fetch checks. High-level ORMs abstract this but low-level APIs do not.
Galaxy’s editor uses high-level drivers that automatically fetch rows before exposing data, so manual fetch-then-read ordering is handled for you.
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