Query OK, 1 row affected (43.05 sec)

Posted 2020-08-06 rsapaper

 1 mysql> create table w0904procedure (wa char, wb char, wd char, wi char);
 2 Query OK, 0 rows affected (0.00 sec)
 3 
 4 mysql> INSERT INTO w0904procedure VALUES(NULL, 0, ‘www0904‘, ‘w0904d‘);
 5 ERROR 1406 (22001): Data too long for column ‘wd‘ at row 1
 6 
 7 mysql> desc w0904procedure;
 8 +-------+---------+------+-----+---------+-------+
 9 | Field | Type    | Null | Key | Default | Extra |
10 +-------+---------+------+-----+---------+-------+
11 | wa    | char(1) | YES  |     | NULL    |       |
12 | wb    | char(1) | YES  |     | NULL    |       |
13 | wd    | char(1) | YES  |     | NULL    |       |
14 | wi    | char(1) | YES  |     | NULL    |       |
15 +-------+---------+------+-----+---------+-------+
16 4 rows in set (0.00 sec)
17 
18 mysql> DROP PROCEDURE IF EXISTS insert_many_rows_w0904;
19 Query OK, 0 rows affected (0.00 sec)
20 
21 mysql> delimiter //
22 mysql> CREATE PROCEDURE insert_many_rows_w0904 (IN loops INT)
23     -> BEGIN
24     ->  DECLARE v1 INT;
25     ->  SET v1=loops;
26     ->  WHILE v1 > 0 DO
27     ->          INSERT INTO w0904procedure VALUES(NULL, 0, ‘w‘, ‘w‘);
28     ->          SET v1 = v1 - 1;
29     ->  END WHILE;
30     -> END;
31     -> //
32 Query OK, 0 rows affected (0.00 sec)
33 
34 mysql> delimiter ;
35 mysql>
36 mysql> SET @loops=987987;
37 Query OK, 0 rows affected (0.00 sec)
38 
39 mysql> CALL insert_many_rows_w0904(@loops);
40 Query OK, 1 row affected (43.05 sec)
41 
42 
43 
44 mysql> SELECT * FROM w0904procedure LIMIT 20;
45 +------+------+------+------+
46 | wa   | wb   | wd   | wi   |
47 +------+------+------+------+
48 | NULL | 0    | w    | w    |
49 | NULL | 0    | w    | w    |
50 | NULL | 0    | w    | w    |
51 | NULL | 0    | w    | w    |
52 | NULL | 0    | w    | w    |
53 | NULL | 0    | w    | w    |
54 | NULL | 0    | w    | w    |
55 | NULL | 0    | w    | w    |
56 | NULL | 0    | w    | w    |
57 | NULL | 0    | w    | w    |
58 | NULL | 0    | w    | w    |
59 | NULL | 0    | w    | w    |
60 | NULL | 0    | w    | w    |
61 | NULL | 0    | w    | w    |
62 | NULL | 0    | w    | w    |
63 | NULL | 0    | w    | w    |
64 | NULL | 0    | w    | w    |
65 | NULL | 0    | w    | w    |
66 | NULL | 0    | w    | w    |
67 | NULL | 0    | w    | w    |
68 +------+------+------+------+
69 20 rows in set (0.00 sec)
70  
71 
72 mysql> SELECT COUNT(*) FROM w0904procedure;
73 +----------+
74 | COUNT(*) |
75 +----------+
76 |   987988 |
77 +----------+
78 1 row in set (0.00 sec)