<p>SIGNAL or RESIGNAL tried to invoke a condition that was not defined with SQLSTATE.</p>
<p>MySQL Error 1646: ER_SIGNAL_BAD_CONDITION_TYPE appears when a SIGNAL or RESIGNAL statement references a condition defined with MYSQL_ERRNO instead of SQLSTATE. Define the condition with SQLSTATE or raise it directly with SIGNAL SQLSTATE 'xxxxx' to resolve the issue.</p>
SIGNAL/RESIGNAL can only use a CONDITION defined with
MySQL throws Error 1646 with message "SIGNAL/RESIGNAL can only use a CONDITION defined with SQLSTATE" when a SIGNAL or RESIGNAL statement refers to a user-defined CONDITION that was registered using MYSQL_ERRNO rather than SQLSTATE.
The error is runtime and stops stored program execution immediately. It surfaces in stored procedures, triggers, or events that attempt structured error handling with SIGNAL or RESIGNAL.
The core trigger is a mismatch between the CONDITION definition and the SIGNAL invocation. MySQL restricts SIGNAL and RESIGNAL to conditions bound to SQLSTATE codes, not MySQL error numbers.
The error also surfaces if the referenced CONDITION was dropped, misspelled, or never created, leading MySQL to treat it as a non-SQLSTATE definition.
Redefine the CONDITION using SQLSTATE instead of MYSQL_ERRNO, or bypass the CONDITION object and raise the error directly with SIGNAL SQLSTATE.
After correcting the definition or statement, recompile the stored routine or trigger and retest to confirm the workflow completes without interruption.
Developers often migrate code from other RDBMSs, using numeric error codes in CONDITION definitions that MySQL will reject during SIGNAL execution. Replace numeric codes with five-character SQLSTATE values to solve the issue.
In legacy code, refactor RESIGNAL statements so they propagate the original SQLSTATE, not a numeric code. This maintains portability and avoids Error 1646.
Always couple SIGNAL and RESIGNAL with SQLSTATE-based CONDITIONs. Document your SQLSTATE catalog and reserve custom codes in the 45000 class for user errors.
Using Galaxy's linting in the SQL editor, enable rule checks that warn when MYSQL_ERRNO appears inside a CONDITION used by SIGNAL. Early detection prevents runtime failures.
Similar runtime issues include Error 1644 (ER_SIGNAL_EXCEPTION) and Error 1645 (ER_CONDITION_NOT_DEFINED). Both relate to incorrect SIGNAL usage and can be resolved with proper SQLSTATE management.
The CONDITION was declared using MYSQL_ERRNO, making it incompatible with SIGNAL and RESIGNAL.
The referenced CONDITION name is misspelled or never created, so MySQL interprets it as invalid.
The CONDITION existed earlier but was dropped or redefined without SQLSTATE before the routine ran.
Code ported from Oracle or SQL Server still uses numeric error codes rather than SQLSTATE.
Raised when a SIGNAL statement is executed. Ensure SQLSTATE is valid and a descriptive MESSAGE_TEXT is provided.
Occurs when SIGNAL refers to a CONDITION that has not been declared within the routine.
Indicates a referenced table does not exist. Often the underlying reason for triggering a custom SIGNAL.
No. MySQL requires SIGNAL and RESIGNAL to work only with SQLSTATE based conditions.
Use class '45000' through '45999' for custom application errors.
SIGNAL and RESIGNAL were introduced in 5.5, so versions earlier than 5.5 do not raise this error.
Galaxy's linting flags non-SQLSTATE CONDITION declarations, guiding you to correct them before execution.
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