mySQL 仅使用 SQL 语句删除带有通配符的表? [英] mySQL drop tables with Wildcard using only SQL statement?

问题描述

看到很多使用通配符删除表而不是直接 SQL 语句，除了这个:

Seen a lot for dropping tables using a wildcard but not a direct SQL statement except this one:

http://azimyasin.wordpress.com/2007/08/11/mysql-dropping-multiple-tables/

它说:

SHOW TABLES LIKE ‘phpbb_%’;

然后是 DROP TABLES，有没有一种巧妙的方法将所有这些组合成一个 SQL 语句?

then DROP TABLES, is there a neat way to combine this all into one SQL Statement?

推荐答案

您可以在存储过程中使用动态 SQL 来执行此操作.它看起来像这样(未经测试):

You could use dynamic SQL to do it, inside a stored procedure. It'd look something like this (untested):

CREATE PROCEDURE drop_like (IN pattern VARCHAR(64))
BEGIN
  DECLARE q tinytext;
  DECLARE done INT DEFAULT FALSE;
  DECLARE cur CURSOR FOR
    SELECT CONCAT('DROP TABLE "', table_schema, '"."', table_name, '"')
    FROM information_schema.tables WHERE table_type = 'BASE TABLE' AND table_name LIKE pattern;
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
  OPEN cur;

  drop_loop: LOOP
    FETCH cur INTO q;
    IF done THEN
      LEAVE drop_loop;
    END IF;
    PREPARE stmt FROM @q;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
  END LOOP;
  CLOSE cur;
END;

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