MariaDB: SP:SIGNAL

SIGNAL error_condition
    [SET error_property
    [, error_property] ...]

error_condition:
    SQLSTATE [VALUE] 'sqlstate_value'
  | condition_name

error_property:
    error_property_name = <error_property_value>

error_property_name:
    CLASS_ORIGIN
  | SUBCLASS_ORIGIN
  | MESSAGE_TEXT
  | MYSQL_ERRNO
  | CONSTRAINT_CATALOG
  | CONSTRAINT_SCHEMA
  | CONSTRAINT_NAME
  | CATALOG_NAME
  | SCHEMA_NAME
  | TABLE_NAME
  | COLUMN_NAME
  | CURSOR_NAME


CREATE PROCEDURE test_error(x INT)
BEGIN
   DECLARE errno SMALLINT UNSIGNED DEFAULT 31001;
   SET @errmsg = 'Hello, world!';
   IF x = 1 THEN
      SIGNAL SQLSTATE '45000' SET
      MYSQL_ERRNO = errno,
      MESSAGE_TEXT = @errmsg;
   ELSE
      SIGNAL SQLSTATE '45000' SET
      MYSQL_ERRNO = errno,
      MESSAGE_TEXT = _utf8'Hello, world!';
   END IF;
END;



CREATE PROCEDURE test_error(n INT)
BEGIN
   DECLARE `too_big` CONDITION FOR SQLSTATE '45000';
   IF n > 10 THEN
      SIGNAL `too_big`;
   END IF;
END;



CREATE PROCEDURE test_error()
BEGIN
   DECLARE EXIT HANDLER
   FOR 1146
   BEGIN
      SIGNAL SQLSTATE '45000' SET
      MESSAGE_TEXT = 'Temporary tables not found; did you call init() procedure?';
   END;
   -- this will produce a 1146 error
   SELECT `c` FROM `temptab`;
END;