以下是一个示例存储过程，用于将指定表中的多个列的月份替换为相应的数字：

DELIMITER //

CREATE PROCEDURE replace_months()
BEGIN
    -- 声明变量
    DECLARE done INT DEFAULT FALSE;
    DECLARE col_name VARCHAR(255);
    DECLARE table_name VARCHAR(255);
    DECLARE cur CURSOR FOR SELECT table_name, column_name FROM information_schema.columns WHERE table_schema = 'your_database_name' AND data_type = 'varchar' AND column_name LIKE '%month%';
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
    
    -- 打开游标
    OPEN cur;
    
    -- 循环处理每个列
    read_loop: LOOP
        -- 获取下一个列
        FETCH cur INTO table_name, col_name;
        
        IF done THEN
            LEAVE read_loop;
        END IF;
        
        -- 构建动态 SQL 语句
        SET @sql = CONCAT('UPDATE ', table_name, ' SET ', col_name, ' = REPLACE(', col_name, ', "jan", "1/"),', col_name, ' = REPLACE(', col_name, ', "feb", "2/"),', col_name, ' = REPLACE(', col_name, ', "mar", "3/"),', col_name, ' = REPLACE(', col_name, ', "apr", "4/"),', col_name, ' = REPLACE(', col_name, ', "may", "5/"),', col_name, ' = REPLACE(', col_name, ', "jun", "6/"),', col_name, ' = REPLACE(', col_name, ', "jul", "7/"),', col_name, ' = REPLACE(', col_name, ', "aug", "8/"),', col_name, ' = REPLACE(', col_name, ', "sep", "9/"),', col_name, ' = REPLACE(', col_name, ', "oct", "10/"),', col_name, ' = REPLACE(', col_name, ', "nov", "11/"),', col_name, ' = REPLACE(', col_name, ', "dec", "12/")');
        
        -- 执行动态 SQL 语句
        PREPARE stmt FROM @sql;
        EXECUTE stmt;
        DEALLOCATE PREPARE stmt;
    END LOOP;
    
    -- 关闭游标
    CLOSE cur;
END //

DELIMITER ;

请注意，上述代码中的 your_database_name 需要替换为实际的数据库名称。此存储过程将遍历指定数据库中的所有表，并查找列名中包含 "month" 的列。然后，它将使用动态SQL语句将每个月份替换为相应的数字。最后，将所有更新的结果返回到原始表中。

要执行此存储过程，请使用以下语法：

CALL replace_months();

请确保在执行存储过程之前，备份数据库以防出现意外情况。