¡¾MySQLÊý¾ÝÀàÐÍ1Ö® ÊýÖµÀàÐÍ¡¿
MySQL»ù±¾ÊýÖµÀàÐÍ´óÖ¿ÉÒԷֳɣº
ÕûÊýÀàÐÍ£ºTINYINT¡¢SAMLLINT¡¢MEDIUMINT¡¢INT¡¢BIGINT--1×Ö½Ú¡¢2¡¢3.¡¢4¡¢8
¸¡µãÊýÀàÐÍ£ºFLOAT(m,d)¡¢DOUBLE(m,d)==REAL-4×Ö½Ú¡¢8
¶¨µãÊýÀàÐÍ£ºDECIMAL(m,d)¡¢NUMERIC-m+2×Ö½Ú¡¢8
λÀàÐÍ£ºBIT(m)-1-8×Ö½Ú
¸÷¸öÀàÐ͵ÄÏêϸ·¶Î§¿ÉÒԲο¼mysqlÎĵµ
Êý¾ÝÀàÐÍСÀý£º
1.ÕûÊýÀàÐÍ
create table t1
(
id int,
id2 int(4)
);
insert t1 select 1,2;
select * from t1;
+------+------+
| id | id2 |
+------+------+
| 1 | 2 |
+------+------+
alter table t1 modify id int zerofill;
alter table t1 modify id2(4) int zerofill;
select * from t1;
+------------+------------+
| id | id2 |
+------------+------------+
| 0000000001 | 0002 |
+------------+------------+
insert t1 select 1,11111;
Select * from t1;
+------------+------------+
| id | id2 |
+------------+------------+
| 0000000001 | 0002 |
| 0000000001 | 11111 |
+------------+------------+
insert t1 select -1,-2;
+-------+------+---------------------------------------------+
| Level | Code | Message |
+-------+------+---------------------------------------------+
| Error | 1264 | Out of range value 
Ïà¹ØÎĵµ£º
ÓÒ¼üÎҵĵçÄÔ->ÊôÐÔ->¸ß¼¶->»·¾³±äÁ¿
¿ÉÒÔ¿´µ½ÓÐÓû§±äÁ¿ºÍϵͳ±äÁ¿
ÔÚÕâÀïÎÒÃÇ¿ÉÒÔ½øÐÐÐ޸Ļ·¾³±äÁ¿
±ÈÈç˵ÎÒÃǰ²×°ÁËMySQL·þÎñÆ÷£¬Ïë½øÈëMySQLµÄÃüÁîÐеϰ¾Í±ØÐëÔËÐÐcmd
Èç¹ûûÓÐÉèÖû·¾³±äÁ¿µÄ»°ÎÒÃDZØÐë½øÈëMySQLµÄ°²×°Â·¾¶²ÅÄÜʹÓÃmysql -u root -pÕâ¸öÃüÁî
ÕâÑù»á¸øÎÒÃÇ´øÀ´ºÜ¶àÂé·³£¬ÕâʱºòÎÒÃÇÏëÔ ......
1Â¥
Ò»¡¢Á¬½ÓMYSQL¡£
¸ñʽ£º mysql -hÖ÷»úµØÖ· -uÓû§Ãû £pÓû§ÃÜÂë
1¡¢Á¬½Óµ½±¾»úÉϵÄMYSQL¡£
Ê×ÏÈ´ò¿ªDOS´°¿Ú£¬È»ºó½øÈëĿ¼mysql\bin£¬ÔÙ¼üÈëÃüÁîmysql -u root -p£¬»Ø³µºóÌáʾÄãÊäÃÜÂë.×¢ÒâÓû§Ãûǰ¿ÉÒÔÓпոñÒ²¿ÉÒÔûÓпոñ£¬µ«ÊÇÃÜÂëǰ±ØÐëÃ»Ó ......
Ö÷´Ó·þÎñÆ÷±íÀàÐ͵ÄÑ¡Ôñ
Ò»°ãµÄ¹²Ê¶ÊÇÖ÷·þÎñÆ÷ʹÓÃinnodb£¬ÊÂÎñ£¬ÐÐËøµÈ¹¦ÄÜÊÇmyisamËùûÓе쬶ÔÐ޸IJÙ×÷¶øÑÔ£¬Ëü¸ü¸ßЧ£»´Ó·þÎñÆ÷ʹÓÃmyisam£¬È«ÎļìË÷¹¦ÄÜÊÇinnodbËùûÓеģ¬¶Ô²éѯ²Ù×÷¶øÑÔ£¬Ëü¸ü¸ßЧ¡£ÕâÑù¾Í¿ÉÒÔ¸÷¾¡ÆäÄÜ¡£
ºÇºÇ£¬Ö÷´Ó¿â¸÷˾ÆäÖ°£¬Ö÷¿â£º×î¿ìµÄËÙ¶È×öÌí¼Óɾ³ýÐ޸IJÙ×÷£¬´Ó¿â£¬×î¿ìµÄËÙ¶È×ö²éѯ²Ù×÷
......
·þÎñÆ÷¶Ë´úÂë,amfphpµÄservicesĿ¼Ï½¨Á¢readData.phpÎļþ,´úÂëÈçÏÂ
<?php
class ReadDB
{
function getData()
&nb ......