Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

MySQLµÄdatetimeÉèÖõ±Ç°Ê±¼äΪĬÈÏÖµ


MySQLµÄdatetimeÉèÖõ±Ç°Ê±¼äΪĬÈÏÖµ 
ÓÉÓÚMySQLĿǰ×ֶεÄĬÈÏÖµ²»Ö§³Öº¯Êý£¬ËùÒÔÓÃ
create_time datetime default now()
µÄÐÎʽÉèÖÃĬÈÏÖµÊDz»¿ÉÄܵġ£
´úÌæµÄ·½°¸ÊÇʹÓÃTIMESTAMPÀàÐÍ´úÌæDATETIMEÀàÐÍ¡£
CURRENT_TIMESTAMP £ºµ±ÎÒ¸üÐÂÕâÌõ¼Ç¼µÄʱºò£¬ÕâÌõ¼Ç¼µÄÕâ¸ö×ֶβ»»á¸Ä±ä
¡£
CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP £ºµ±ÎÒ¸üÐÂÕâÌõ¼Ç¼µÄʱºò£¬ÕâÌõ¼Ç¼µÄÕâ¸ö×ֶν«»á¸Ä±ä
¡£¼´Ê±¼ä±äΪÁ˸üÐÂʱºòµÄʱ¼ä¡££¨×¢ÒâÒ»¸öUPDATEÉèÖÃÒ»¸öÁÐΪËüÒѾ­ÓеÄÖµ£¬Õ⽫²»ÒýÆðTIMESTAMPÁб»¸üУ¬ÒòΪÈç¹ûÄãÉèÖÃÒ»¸öÁÐΪËüµ±Ç°µÄÖµ£¬MySQLΪÁËЧÂʶøºöÂÔ¸ü¸Ä¡££©Èç¹ûÓжà¸öTIMESTAMPÁУ¬Ö»ÓеÚÒ»¸ö×Ô¶¯¸üС£


Ïà¹ØÎĵµ£º

MYSQL ʼþµ÷¶ÈµÄÀý×Ó

1.SET GLOBAL event_scheduler = ON;
2.show processlist;
3.´´½¨Ò»¸ö±í test Ö÷Òª×Ö¶Î no,name,sex,age
4.¶Ô¸Ã±í²åÈ缸ÌõÊý¾Ý
5.´´½¨´æ´¢¹ý³Ìadd_age
drop procedure if exists add_age;
delimiter|
create procedure add_age()
begin
  start transaction;
  update eventtest set age = age +1;
&n ......

MySQLÓÅ»¯

µØÖ·£º http://imysql.cn/taxonomy/term/1?page=1
[InnoDBϵÁÐ] -- innodb±íÈçºÎ¸ü¿ìµÃµ½count(*)½á¹û£ºhttp://imysql.cn/2008_06_24_speedup_innodb_count
[InnoDBϵÁÐϵÁÐ] -- ´óÊý¾ÝÁ¿µÄµ¼³öµ¼Èë·½·¨±È½Ï£º
http://imysql.cn/2007_10_15_large_innodb_table_export_import
[MySQLÓÅ»¯°¸Àý]ϵÁÐ -- DISABLE/ENABLE K ......

linux mysqlÅäÖÃ


Ð¶ÔØmysql
1¡¢²éÕÒÒÔǰÊÇ·ñ×°ÓÐmysql
ÃüÁrpm -qa|grep -i mysql
¿ÉÒÔ¿´µ½mysqlµÄÁ½¸ö°ü£º
mysql-4.1.12-3.RHEL4.1
mysqlclient10-3.23.58-4.RHEL4.1
2¡¢É¾³ýmysql
ɾ³ýÃüÁrpm -e --nodeps °üÃû
( rpm -ev mysql-4.1.12-3.RHEL4.1 )
3¡¢É¾³ýÀϰ汾mysqlµÄ¿ª·¢Í·ÎļþºÍ¿â
ÃüÁrm -fr /usr/lib/mysql
r ......

Mysql limitÓ÷¨

1.SELECT
 
*
 
from
 
table
 LIMIT
1
,
20
;  
//
 ¼ìË÷¼Ç¼ÐÐ
2-21
   µÚÒ»¸ö²ÎÊý£º²éѯÆðʼÐУ¨´Ó0¿ªÊ¼£©
   µÚ¶þ¸ö²ÎÊý£º²éѯ¼¸Ìõ¼Ç¼
2.
SELECT
 
*
 
from
 
table
 LIMIT
5
,
-
1

//
&nbs ......

¾­µäµÄMYSQLÓï¾ä

·Ç³£³£Óõģº¾­µäµÄMYSQLÓï¾ä…… php¿ªÔ´
ÕâÕæÊÇÒ»¸öºÃ¶«Î÷£ºÑ§Ï°ºÃÁ˺ÜÊÜÓõÄŶ……
SQL·ÖÀࣺ
DDL—Êý¾Ý¶¨ÒåÓïÑÔ(Create£¬Alter£¬Drop£¬DECLARE)
DML—Êý¾Ý²Ù×ÝÓïÑÔ(Select£¬Delete£¬Update£¬Insert)
DCL—Êý¾Ý¿ØÖÆÓïÑÔ(GRANT£¬REVOKE£¬COMMIT£¬ROLLBACK)php¿ªÔ´
Ê×ÏÈ,¼òÒ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ