EC
1401
MySQLerrorqueryhigh confidence

Unknown prepared statement handler

Production Risk

Low — statement fails; no data changed.

What this means

EXECUTE or DEALLOCATE PREPARE was called with a statement handle name that does not exist in the current session.

Why it happens
  1. 1Typo in the prepared statement name
  2. 2Statement was deallocated or the session was reset before EXECUTE
  3. 3Prepared statement not yet created with PREPARE
How to reproduce
trigger — this will error
trigger — this will error
EXECUTE nonexistent_stmt;

expected output

ERROR 1401 (HY000): Unknown prepared statement handler (nonexistent_stmt) given to EXECUTE

Fix

Ensure PREPARE runs before EXECUTE

Ensure PREPARE runs before EXECUTE
PREPARE stmt FROM 'SELECT ?'; EXECUTE stmt USING @val;

Why this works

Prepared statements are session-scoped; prepare them before executing.

Sources
Official documentation ↗

MySQL 8.0 — 1401 ER_UNKNOWN_STMT_HANDLER

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