I have a MySQL stored procedure where I find the max value from a table.
If there is no value I want to set the variable to yesterday's date.
DECLARE current_procedure_name CHAR(60) DEFAULT 'accounts_general';
DECLARE last_run_time datetime DEFAULT NULL;
DECLARE current_run_time datetime DEFAULT NOW();
-- Define the last run time
SET last_run_time := (SELECT MAX(runtime)
FROM dynamo.runtimes WHERE procedure_name = @current_procedure_name);
-- if there is no last run time found then use yesterday as starting point
IF(@last_run_time IS NULL) THEN
SET last_run_time := DATE_SUB( NOW(), INTERVAL 1 DAY);
END IF;
SELECT @last_run_time;
The problem is that @last_run_time is always NULL.
The following code is not being executed for some reason
IF(last_run_time IS NULL) THEN
SET last_run_time := DATE_SUB( NOW(), INTERVAL 1 DAY);
END IF;
How can I set the variable @last_run_time correctly?
This question is related to
mysql
stored-procedures
@last_run_time is a 9.4. User-Defined Variables and last_run_time datetime one 13.6.4.1. Local Variable DECLARE Syntax, are different variables.
Try: SELECT last_run_time;
UPDATE
Example:
/* CODE FOR DEMONSTRATION PURPOSES */
DELIMITER $$
CREATE PROCEDURE `sp_test`()
BEGIN
DECLARE current_procedure_name CHAR(60) DEFAULT 'accounts_general';
DECLARE last_run_time DATETIME DEFAULT NULL;
DECLARE current_run_time DATETIME DEFAULT NOW();
-- Define the last run time
SET last_run_time := (SELECT MAX(runtime) FROM dynamo.runtimes WHERE procedure_name = current_procedure_name);
-- if there is no last run time found then use yesterday as starting point
IF(last_run_time IS NULL) THEN
SET last_run_time := DATE_SUB(NOW(), INTERVAL 1 DAY);
END IF;
SELECT last_run_time;
-- Insert variables in table2
INSERT INTO table2 (col0, col1, col2) VALUES (current_procedure_name, last_run_time, current_run_time);
END$$
DELIMITER ;
Source: Stackoverflow.com