EC
1243
MySQLERRORCriticalPrepared StatementsHIGH confidence

Unknown prepared statement handler given to EXECUTE

Production Risk

Low — statement fails; no data affected.

What this means

ER_UNKNOWN_STMT_HANDLER (1243, SQLSTATE HY000) is raised when EXECUTE, DEALLOCATE PREPARE, or a cursor statement references a prepared statement name that does not exist in the current session.

Why it happens
  1. 1Executing a prepared statement that was never prepared in this session
  2. 2Misspelling the prepared statement name
  3. 3Prepared statement was deallocated or the session was reconnected
How to reproduce
trigger — this will error
trigger — this will error
EXECUTE non_existent_stmt;  -- ERROR 1243

expected output

ERROR 1243 (HY000): Unknown prepared statement handler (non_existent_stmt) given to EXECUTE

Fix

Prepare the statement before executing

Prepare the statement before executing
PREPARE my_stmt FROM 'SELECT * FROM orders WHERE id = ?';
SET @id = 1;
EXECUTE my_stmt USING @id;
DEALLOCATE PREPARE my_stmt;

Why this works

Prepared statements are session-scoped. Always PREPARE before EXECUTE in the same session.

Sources
Official documentation ↗

MySQL 8.0 — 1243 ER_UNKNOWN_STMT_HANDLER

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