sql ²éѯ-¸üР×èÈû¡£¡£¡£¡££¿
Óöµ½µÄÏÖÏóÊÇ Í¬Ò»¸ö±íµÄquery»á×èÈûupdate
sql query ºÍupdate ²Ù×÷ query»á×èÈûupdate²Ù×÷Âð
Ôõô½â¾ö
ÊDz»ÊÇʲôÉèÖò»¶Ô»¹ÊÇÔõµÄ
Èç¹û»áµÄ»°£¬ÄÇͬһ¸ö±íµÄƵ·±query and update ÄÇÊý¾Ý¿â²»×èÈûµÄ²»ÏñÑù×Ó°¡
Çó½â
ѧϰ£¬°ï¶¥£¬×îºÃÃèÊöһϾßÌåÒµÎñ
SQL code:
1 ÈçºÎËøÒ»¸ö±íµÄijһÐÐ
A Á¬½ÓÖÐÖ´ÐÐ
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ
begin tran
select * from tablename with (rowlock) where id=3
waitfor delay '00:00:05'
commit tran
BÁ¬½ÓÖÐÈç¹ûÖ´ÐÐ
update tablename set colname='10' where id=3 --ÔòÒªµÈ´ý5Ãë
update tablename set colname='10' where id<>3 --¿ÉÁ¢¼´Ö´ÐÐ
2 Ëø¶¨Êý¾Ý¿âµÄÒ»¸ö±í
SELECT * from table WITH (HOLDLOCK)
×¢Òâ: Ëø¶¨Êý¾Ý¿âµÄÒ»¸ö±íµÄÇø±ð
SELECT * from table WITH (HOLDLOCK)
ÆäËûÊÂÎñ¿ÉÒÔ¶ÁÈ¡±í£¬µ«²»ÄܸüÐÂɾ³ý
SELECT * from table WITH (TABLOCKX)
ÆäËûÊÂÎñ²»ÄܶÁÈ¡±í,¸üкÍɾ³ý
SQL code:
ÅÅËûËø
http://topic.csdn.net/u/20080425/10/a1d7d337-a918-4c8c-ba97-44ae4472ade4.html?1527885039
²»Ã÷°×ʲôÒâ˼
.
Èç¹ûÊÇËøµÄ»°¿ÉÒԲο¼Ï£º
http://blog.csdn.net/fredrickhu/archi
Ïà¹ØÎÊ´ð£º
±¾ÈËc#ÐÂÊÖ ¿ÉÊÇÒªÇóÒªÓÃc# £¬sql2000¿ª·¢c/sµÄ¹¤×÷Á÷£¬Ò»Í·ÎíË®£¬Çë´ó¼Ò°ïæ°ï棬¸øµã˼·£¬ËµµÄÔ¼¾ßÌåÔ½ºÃ£¬ÎÒÒ²ºÃÍùÄǸö·½Ãæȥѧϰ
http://www.hxzi.com/view/61402.html
B/S°æµÄ£¬»ù±¾Ë¼ÏëÓ¦¸Ã²î²»¶àµÄ¡£¡£ ......
û¸É¹ýÕâÊ£¬Ò²²»ÖªµÀoracleÊý¾Ý¿âɶÑù£¬Çë½Ì´óϺÃǾßÌå²½ÖèÊÇʲô£¿ÐèҪעÒâЩʲô£¿
ÊÇÕû¸ö¿âµÄÊý¾Ý»¹ÊÇ±íµ¥?
Õæ¸öÊý¾Ý¿â
Õû¸öÊý¾Ý¿â£¬ÁíÍâÎÒÊÇ´Óһ̨װÓÐoracleµÄµçÄÔµ¼Èëµ½Áíһ̨װÓÐsql serverµÄµçÄÔÖС ......
¿Í»§±í£º
¿Í»§±àºÅ ¿Í»§ÏúÊÛ×ܶî
aa 200
bb 300
cc ......
ÇëÎʸßÊÖ2005µÄ±ê×¼°æÊÇ·ñ¿ÉÒÔÔ¶³ÌÁ¬½Ó£¬Èç¹û¿ÉÒÔ£¬Ó¦¸ÃÔõôÉèÖã¬ÎÒ°´ÕÕ Express°æµÄÉèÖÃÁË£¬²»ÐС£¡£
¿ÉÒÔ
¿ÉÒÔ
²»ÖªµÀÄãÏëÔõôԶ³ÌÁ´½Ó
Ö±½ÓÔÚ¿Í»§¶ËµÇ¼¡£¡£
°´ÕÕ5Â¥µÄ×öÁË È»ºóÔÚ¿Í»§¶ËдÁ¬½Ó× ......
ÓÐÒ»¸ö±íAA
name tj
1 a
1 b
1 c
2 a
2 d
3 b
ÒªÇóµ±tj×ֶεÄÖµ¼ÈµÈÓÚaÓÖµÈÓÚcʱ£¨tj = ¡®a¡ ......