create a table with date name

问题

I am writing a simple procedure to backup a table-

CREATE PROCEDURE daily_backup()
BEGIN
   DECLARE given_date VARCHAR(25);
   SET given_date = now(); 

   CREATE TABLE given_date LIKE db1.table1;
   INSERT INTO given_date SELECT * FROM db1.table1;


END

But it creates a table with name given_date . I want to create a table with date as name. How to do the same ?

回答1:

Try this one

DELIMITER |
CREATE PROCEDURE daily_backup()
BEGIN
  SET @s = CONCAT('CREATE TABLE bak_', DATE_FORMAT(CURDATE(), '%Y%m%d'), ' SELECT * FROM table1');
  PREPARE stmt FROM @s;
  EXECUTE stmt;
END
|
DELIMITER ;

UPDATE: You can make it run multiple times a day

DROP PROCEDURE daily_backup;
DELIMITER |
CREATE PROCEDURE daily_backup()
BEGIN
  SET @tbl = DATE_FORMAT(CURDATE(), '%Y%m%d');
  SET @s = CONCAT('DROP TABLE IF EXISTS bak_', @tbl);
  PREPARE stmt FROM @s;
  EXECUTE stmt;

  SET @s = CONCAT('CREATE TABLE bak_', @tbl, ' SELECT * FROM table1');
  PREPARE stmt FROM @s;
  EXECUTE stmt;
END
|
DELIMITER ;

Here is SQLFiddle demo

回答2:

generate create statement with prepare like :-

set @given_date = now();
SET @sql = CONCAT("CREATE TABLE ",@given_date," as SELECT * FROM db1.table1");
PREPARE stmt from @sql;
EXECUTE stmt;

ps:- table name should be valid according to this.

来源：https://stackoverflow.com/questions/17106254/create-a-table-with-date-name