How to create an Archive Table with a Mysql Procedure and Date() - mysql

Question

I try to create a procedure which runs once a day and stores a subset of data from a bigger Table. The Name of this table should be dynamically created with CURDATE().
DROP PROCEDURE daily_backup;
DELIMITER |
CREATE PROCEDURE daily_backup()
BEGIN
SET #tbl = CONCAT('items_data_', DATE_FORMAT(CURDATE(), '%Y%m%d'));
SET #s = CONCAT('DROP TABLE IF EXISTS ', #tbl);
PREPARE stmt FROM #s;
EXECUTE stmt;
#s = CONCAT('CREATE TABLE `', #tb1, '` (`id` int(11) NOT NULL,`up` mediumint(9) NOT NULL,`down` mediumint(9) NOT NULL) ENGINE=Archive');
PREPARE stmt FROM #s;
EXECUTE stmt;
SET #s = CONCAT('INSERT INTO ', #tbl, ' SELECT id,up,down FROM items;');
PREPARE stmt FROM #s;
EXECUTE stmt;
END
These are the results
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '#s = CONCAT('CREATE TABLE `', #tb1, '` (`id` int(11) NOT NULL,`up` mediumint(9) ' at line 8
EDIT // Working now
DROP PROCEDURE daily_backup;
DELIMITER |
CREATE PROCEDURE daily_backup()
BEGIN
SET #tbl = CONCAT('items_data_', DATE_FORMAT(CURDATE(), '%Y%m%d'));
SET #s = CONCAT('DROP TABLE IF EXISTS ', #tbl);
PREPARE stmt FROM #s;
EXECUTE stmt;
SET #s = CONCAT('CREATE TABLE `', #tbl, '` (`id` int(11) NOT NULL,`up` mediumint(9) NOT NULL,`down` mediumint(9) NOT NULL) ENGINE=Archive');
PREPARE stmt FROM #s;
EXECUTE stmt;
SET #s = CONCAT('INSERT INTO ', #tbl, ' SELECT id,up,down FROM items;');
PREPARE stmt FROM #s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END

Answer 1

Variable assignments always need a SET command:
SET #s = CONCAT('CREATE TABLE `', #tbl, '` (`id` int(11) NOT NULL,`up` mediumint(9) NOT NULL,`down` mediumint(9) NOT NULL) ENGINE=Archive');
Note that you have #tb1 in this statement, it should be #tbl.
It's also good practice to DEALLOCATE a prepared statement after you use it i.e.
DEALLOCATE PREPARE stmt;
after the EXECUTE stmt