The MySQL client reports CR_STMT_CLOSED when an application tries to use a prepared statement handle that the client library has already closed.
MySQL Error 2056: CR_STMT_CLOSED signals that the client library already closed your prepared statement, usually after a preceding mysql_stmt_close() or similar call. Re-prepare the statement or adjust your call order to fix the issue.
Statement closed indirectly because of a preceding %s() call
MySQL error code 2056 with condition name CR_STMT_CLOSED comes from the MySQL client library, not the server. It appears when your application calls a statement API function on a MYSQL_STMT handle that has already been closed.
The client automatically sets this error after a successful mysql_stmt_close(), mysql_stmt_reset(), or an implicit close caused by connection loss.
Any further use of the stale handle returns CR_STMT_CLOSED immediately.
The error surfaces in C, C++, JDBC, Python, and PHP connectors that wrap the C client.
It is common in long-running services that reuse statement variables or manage connection pools.
Developers often see it after accidentally calling mysql_stmt_execute() twice in a row without re-prepare, or after a helper routine closes the statement earlier in the flow.
Ignoring CR_STMT_CLOSED leads to application crashes, missing data, or silent logic errors.
Correct handling ensures connection-pool health, memory hygiene, and predictable query execution.
The primary cause is attempting to execute, bind, or fetch on a MYSQL_STMT that was closed by mysql_stmt_close().
Another common trigger is an implicit close when mysql_close() ends the session or a network interruption forces the client to discard prepared statements.
Using a stale handle pulled from a cleared connection pool slot also raises this error.
Always prepare a new statement after closing a previous one.
Re-order code so mysql_stmt_close() is the final call on that handle.
Check return values of mysql_stmt_prepare(), mysql_stmt_execute(), and network operations. On failure, create a fresh connection and statement.
In high-level languages, set statement variables to null after close, preventing accidental reuse.
Connection pool libraries that auto-reset statements can fire CR_STMT_CLOSED if your code reuses the handle.
Configure the pool to return a new handle or disable implicit reset.
Batch jobs that loop over prepares and closes should allocate a new MYSQL_STMT inside the loop instead of outside it.
Keep each prepared statement in a tight life-cycle: prepare, bind, execute, fetch, close. Never store handles globally.
Instrument your MySQL driver logging to catch unexpected close events.
Monitor for CR_STMT_CLOSED spikes in production.
Adopt a modern SQL editor like Galaxy that highlights statement-lifecycle misuse in code snippets and during review.
CR_SERVER_LOST (2013) indicates the connection ended, implicitly closing all statements. Reconnect and re-prepare.
CR_COMMANDS_OUT_OF_SYNC (2014) appears when calls are issued in the wrong order. Ensure proper sequence.
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No. It is generated by the MySQL client library when a statement handle is invalid.
No. Once closed, allocate a new MYSQL_STMT with mysql_stmt_init().
Automatic reconnect creates a new connection but you must re-prepare every statement manually.
Galaxy manages statement lifecycle in its execution engine, removing manual open-close errors from your application code.
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