Ò»¸ö¼òµ¥µÄMysqlµÄÁªºÏ²éѯÁÐ×Ó
Ò»¸ömysqlµÄÁªºÏ²éѯÁÐ×Ó£¬ºÜ»ù±¾µÄ£¬²»¹ýºÜʵÓá£
ÏÈ¿´Êý¾Ý±í¡£Êý¾Ý±íclass£º
-------------------------------
id cname
-------------------------------
1 ÄÐ×°
2 ŮƤ¿ã
3 Å®²ÊÃÞ
-------------------------------
class±í´æ·ÅµÄÊDzúÆ·µÄ´óÀàÃû³ÆºÍÆäÐòºÅ
Êý¾Ý±íproduct£º
-------------------------------
pid ptype pparent
-------------------------------
1 A01 1
2 A21 1
3 B10 2
4 C11 3
5 C01 2
-------------------------------
product±í´æ·ÅµÄÊDzúÆ·Ãû³Æ£¬ºÍÆäËùÊô´óÀàµÄid£¨pparent£©
ÏÖÔÚÒªÇóÏÔʾËùÓвúÆ·ÐòºÅ¡¢Ãû³Æ¡¢ËùÊôÀà±ð£¬ÈçÏÂÐÎʽ£º
-------------------------------
ÐòºÅ Ãû³Æ Àà±ð
-------------------------------
1 A01 ÄÐ×°
2 A21 ÄÐ×°
3 B10 ŮƤ¿ã
4 C11 Å®²ÊÃÞ
5 C01 ŮƤ¿ã
-------------------------------
ÕâÀïÒª²éѯproduct±í£¬¸ù¾Ýpparent×Ö¶ÎÔÙ¶Á³ö¶ÔÓ¦µÄclass±íÖÐpname×ֶΡ£×ͳµÄ£¬¿ÉÒÔÓÃÁ½¸öselectÓï¾äʵÏÖ£¬µ«ÊÇmysqlÖÐÓÐÁªºÏ²éѯÓï¾ä¿ÉÒÔ¼òµ¥µÄʵÏÖ£º
select product.*, class.* from product inner join class on product.pparent=class.id where product.pid is not null
ÔÚphpÖУ¬Í¨¹ýÕâÑù²éѯ³öÀ´µÄ¼Ç¼¶¼·ÅÔÚÊý×éÀïÃæ£¬±ÈÈ磺
$myrow=mysql_fetch_array(mysql_query($sql));
ÄÇô$myrowÊý×éÖУ¬Ç°Ãæ´æ·ÅµÄÊÇproductÖеÄ×ֶΣ¬ºóÃæ´æ·ÅµÄÊÇclassµÄ×ֶΡ£
Ïà¹ØÎĵµ£º
inner joins 內Á¬½Ó½öÑ¡³öÁ½ÕűíÖл¥ÏàÆ¥ÅäµÄ¼Ç¼£®Òò´Ë£¬Õâ»áµ¼ÖÂÓÐʱÎÒÃÇÐèÒªµÄ¼Ç¼ûÓаüº¬½øÀ´¡£
Ϊ¸üºÃµÄÀí½âÕâ¸ö¸ÅÄÎÒÃǽéÉÜÁ½¸ö±í×÷ÑÝʾ¡£ËÕ¸ñÀ¼Òé»áÖеÄÕþµ³±í(party)ºÍÒéÔ±±í(msp)¡£
party(Co
de,Name,Leader)
Code: Õþµ³´úÂë
Name: Õþµ³Ãû³Æ
Leader: Õþµ³ÁìÐä
msp(Name,Party,Constituency ......
Ò» Apache°²×°
# tar zxvf httpd-2.2.14.tar.gz(½âѹ)
# cd httpd-2.2.14(½øÈë½âѹºóµÄĿ¼)
# ./configure --prefix=/usr/local/apache2 --enable-so --enable-mods-shared=all
(ÃüÁî#./configure --help¿ÉÒԲ鿴configureµÄÅäÖòÎÊý
--prefix=°²×°Â·¾¶
--enable-so //´ò¿ª DSO Ö§³ÖµÄ a ......
user±í:
id | name
———
1 | libk
2 | zyfon
3 | daodao
user_action±í:
user_id | action
—————
1 | jump
1 | kick
1 | jump
2 | run
4 | swim
sql:
select id, name, action from user as u
left join user_action a on u.id = a.user_id
result:
id | ......
---- ÔÚÊý¾Ý¿âµÄÓ¦Óÿª·¢ÖУ¬³£³£»áÓöµ½ÐÔÄܺʹú¼ÛµÄÖ®¼äì¶Ü¡£ÒÔ×÷ÕßÔÚ¿ª·¢¹ÉÊÐÐÐ
Çé²éѯºÍ½»Ò×ϵͳÖÐÓöµ½µÄÎÊÌâΪÀý£¬ÒªÔÚʵʱ¼Ç¼1000¶àÖ»¹ÉƱÿ·ÖÖÓ¸üÐÂÒ»´ÎµÄÐÐ
ÇéÊý¾ÝµÄͬʱ£¬ÏìÓ¦´óÁ¿²¢·¢Óû§µÄÊý¾Ý²éѯÇëÇ󡣿¼Âǵ½ÐԼ۱ȺÍÒ×ά»¤ÐÔ£¬ÏµÍ³ÓÖ
ÒªÇóÔÚ»ùÓÚPC·þÎñÆ÷£¬Windows NTƽ̨µÄÈíÓ²¼þ»·¾³ÏÂʵÏÖ¡£¿ª ......
mysqldump -u[user] -p[password] [databasename] > [dump_name]
ÔÚ½« dump_name Õâ¸öµµ°¸¸´ÖƵ½Áíһ̨¼ÆËã»úÉÏ
Áíһ̨¼ÆËã»úÉÏÏȽøÈëmysql
½¨Á¢Ò»¸ö database ÔÙÖ´ÐÐÏÂÁÐÖ¸Áî
mysql -u[user] -p[password] [database_name] < [dump_name]
MYSQL¼¸ÖÖ±¸·Ý·½·¨¸ÅÊö
MysqlÊý¾Ý
¿â±¸·ÝÖ÷ÒªÓÐ4Ö ......