ORACLE ÓαêµÄʹÓÃ
declare cursor myCursor is select * from ±íÃû;
myRow myCursor%rowtype;
begin
open myCursor;
loop
fetch myCursor into myRow;
exit when myCursor%notfound;
--ÒªÖ´ÐеÄSQLÓï¾ä
end loop;
end;
Ïà¹ØÎĵµ£º
/*connect byº¯Êý*/
CREATE TABLE TBL_TEST
(
ID NUMBER,
NAME VARCHAR2(100 BYTE),
PID NUMBER   ......
String sql = "select t.FILE_INFO from T_FILE_DB_DETAIL t where t.id= "
+ fileDBUpDownDetail.getId() + " for update";
rs = stmt.executeQuery(sql);
if (rs.next()) {
// ÔÚweblogicϲ¿Êðʱ£¬ÐèÒª¸ü¸ÄΪBea We ......
Ê×ÏÈ£¬ÎÒÃÇҪȷ¶¨Êý¾Ý¿âÔËÐÐÔÚºÎÖÖÓÅ»¯Ä£Ê½Ï£¬ÏàÓ¦µÄ²ÎÊýÊÇ£ºoptimizer_mode¡£¿ÉÔÚsvrmgrlÖÐÔËÐГshow parameter optimizer_mode"À´²é¿´¡£ORACLE V7ÒÔÀ´È±Ê¡µÄÉèÖÃÓ¦ÊÇ"choose"£¬¼´Èç¹û¶ÔÒÑ·ÖÎöµÄ±í²éѯµÄ»°Ñ¡ÔñCBO£¬·ñÔòÑ¡ÔñRBO¡£Èç¹û¸Ã²ÎÊýÉèΪ“rule”£¬Ôò²»ÂÛ±íÊÇ·ñ·ÖÎö¹ý£¬Ò»¸ÅÑ¡ÓÃRBO£¬³ý·ÇÔÚÓï¾äÖÐ ......
mysql ´ó¶ÔÏó´æÈ¡:
ÀàÐÍÒ»°ãÓ¦¸ÃÓÃmediumblod,
blobÖ»ÄÜ´æ2µÄ16´Î·½¸öbyte,
mediumblodÊÇ24´Î·½,
Ò»°ãÀ´Ëµ¹»ÓÃÁË.longblobÊÇ32´Î·½ÓÐЩ´ó.
MYSQLĬÈÏÅäÖÃÖ»ÄÜ´æ1M´óСµÄÎļþ,ÒªÐÞ¸ÄÅäÖÃ,WIN°æ±¾µÄÔÚmysql.iniÎļþÖÐ
ÐÞ¸Ämax_allowed_packet,net_buffer_lengthµÈ¼¸¸ö²ÎÊý,»òÖ±½ÓSET GLOBAL varName=value.
linux°æ± ......
Ò». µ¼³ö¹¤¾ß exp
1. ËüÊDzÙ×÷ϵͳÏÂÒ»¸ö¿ÉÖ´ÐеÄÎļþ ´æ·ÅĿ¼/ORACLE_HOME/bin
expµ¼³ö¹¤¾ß½«Êý¾Ý¿âÖÐÊý¾Ý±¸·ÝѹËõ³ÉÒ»¸ö¶þ½øÖÆÏµÍ³Îļþ.¿ÉÒÔÔÚ²»Í¬OS¼äÇ¨ÒÆ
ËüÓÐÈýÖÖģʽ£º
a. Óû§Ä£Ê½£º µ¼³öÓû§ËùÓжÔÏóÒÔ¼°¶ÔÏóÖÐµÄ ......