用auto_increment填充表格的最有效方法

Question

我有一個只有ID（INT auto_increment）的表格。 什麼是最有效的方式來填充表的條目，直到給定的參數？

這裏是我想出了一個存儲過程，但它需要相當長的時間100000個記錄來填充它：

DELIMITER $$ 
CREATE PROCEDURE insert_id(
IN createnum INT 
) 
BEGIN 
    DECLARE i INT DEFAULT 1; 

    WHILE i < createnum DO 
    INSERT INTO table VALUES (i); 
    SET i = i + 1; 
    END WHILE; 
END$$ 
DELIMITER ; 

Answer 1

將不使用任何循環的最快方式，只需使用純SQL

insert into table1 (id) 
select a.N + b.N * 10 + c.N * 100 + d.N * 1000 + e.N * 10000 + 1 as N 
from (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) a 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) b 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) c 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) d 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) e 
order by N 

此查詢插入100000行

這裏是SQLFiddle演示

---

如果你想

CREATE PROCEDURE insert_id(IN _maxid INT) 
insert into table1(id) 
select n 
    from 
(
    select a.N + b.N * 10 + c.N * 100 + d.N * 1000 + e.N * 10000 + f.N * 100000 + 1 N 
    from (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) a 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) b 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) c 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) d 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) e 
     , (select 0 as N union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) f 
) t 
where n <= _maxid; 

此過程可以填充可達1m行您可以在過程包裹。

使用範例：

CALL insert_id(5500); 
CALL insert_id(100000); 

您也可以看看這個帖子MySQL: Fill a table within a Stored Procedure efficiently