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[è½¬] å…³äºŽoracle with table as åˆ›å¾ä¸´æ—¶è¡¨çš„ç”¨æ³•½CÞZ¾‹

ç´«è¶âˆé£›æšâ†— — Tue, 06 Dec 2011 08:47:00 GMT

1ã€with table as ç›¸å½“äºŽå¾ä¸ªäÍ(f¨´)æ—¶è¡¨åQˆç”¨äºŽä¸€ä¸ªè¯å¥ä¸æŸäº›ä¸é—´¾l“æžœæ”‘Öœ¨ä¸´æ—¶è¡¨ç©ºé—´çš„SQLè¯å¥åQ‰ï¼ŒOracle 9i æ–°å¢žWITHè¯æ³•åQŒå¯ä»¥å°†æŸ¥è¯¢ä¸çš„åæŸ¥è¯¢å‘½åï¼Œæ”‘Öˆ°SELECTè¯å¥çš„æœ€å‰é¢ã€?/span>

è¯æ³•ž®±æ˜¯
with tempname as (select ....)
select ...

ä¾‹ååQ?/span>
with t as (select * from emp where depno=10)
select * from t where empno=xxx

with
wd as (select did,arg(salary) òq›_‡å·¥èµ„ from work group by did),
em as (select emp.*,w.salary from emp left join work w on emp.eid = w.eid)
select * from wd,em where wd.did =em.did and wd.òq›_‡å·¥èµ„>em.salary;

2ã€ä½•æ—¶è¢«æ¸…é™¤
ä¸´æ—¶è¡¨ä¸éƒ½æ˜¯ä¼?x¨¬)è¯¾l“æŸž®Þp‡ªåŠ¨è¢«PGAæ¸…é™¤å˜? ä½†with asä¸´æ—¶è¡¨æ˜¯æŸ¥è¯¢å®ŒæˆåŽå°±è¢«æ¸…é™¤äº†(ji¨£n)åQ?/span>
23:48:58 SCOTT@orcl> with aa as(select * from dept)
23:57:58   2 select * from aa;

    DEPTNO DNAME          LOC
---------- -------------- -------------
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTON

å·²ç”¨æ—‰™—´: 00: 00: 00.12
23:58:06 SCOTT@orcl> select * from aa;
select * from aa
              *
½W?1 è¡Œå‡ºçŽ°é”™è¯?
ORA-00942: è¡¨æˆ–è§†å›¾ä¸å˜åœ?/span>

å·²ç”¨æ—‰™—´: 00: 00: 00.02
23:58:14 SCOTT@orcl>

3ã€å°±˜q™ä¸€åŠŸèƒ½æ¥è¯´åQŒåæŸ¥è¯¢ž®±å¯ä»¥è¾¾åˆ°å•ŠåQŒäØ“(f¨´)ä»€ä¹ˆè¦ç”¨withå‘¢ï¼Ÿ ç”¨withæœ‰ä»€ä¹ˆå¥½å¤„ï¼Ÿ
éƒ½èƒ½å†™ï¼Œä½†æ‰§è¡Œè®¡åˆ’ä¸åŒçš„ã€‚å½“æœ‰å¤šä¸ªç›¸ä¼¼åæŸ¥è¯¢çš„æ—¶å€™ï¼Œç”¨withå†™å…¬å…±éƒ¨åˆ†ï¼Œå› äØ“(f¨´)åæŸ¥è¯¢ç»“æžœåœ¨å†…å˜ä¸´æ—¶è¡¨ä¸åQŒæ‰§è¡Œæ•ˆçŽ‡å½“ç„¶å°±é«˜å•¦~

4ã€é—®é¢˜ï¼š(x¨¬)
æœ‰å¼ è¡¨æ•°æ®å¦‚ä¸‹ï¼š(x¨¬)
aaa é«?/span>
bbb ä½?/span>
aaa ä½?/span>
aaa é«?/span>
bbb ä½?/span>
bbb é«?/span>
éœ€è¦å¾—åˆîC¸‹åˆ—ç»“æž?
é«?ä½?/span>
aaa 2 1
bbb 1 2
é—?SQL è¯å¥æ€Žä¹ˆå†™ï¼ŸåQ?/span>

½{”æ¡ˆåQ?/span>
with tt as (
select 'aaa' id, 'é«? value from dual union all
select 'bbb' id, 'ä½? value from dual union all
select 'aaa' id, 'ä½? value from dual union all
select 'aaa' id, 'é«? value from dual union all
select 'bbb' id, 'ä½? value from dual union all
select 'bbb' id, 'é«? value from dual)
SELECT id,
       COUNT(decode(VALUE, 'é«?, 1)) é«?
       COUNT(decode(VALUE, 'ä½?, 1)) ä½?/span>
FROM tt
GROUP BY id;
===================================================================
æ‰©å±•åQ?/span>
Oracle9iæ–°å¢žWITHè¯æ³•åQŒå¯ä»¥å°†æŸ¥è¯¢ä¸çš„åæŸ¥è¯¢å‘½åï¼Œæ”‘Öˆ°SELECTè¯å¥çš„æœ€å‰é¢ã€?/span>

ã€€ã€€ä¸€ä¸ªç®€å•çš„ä¾‹å:

SQL> WITH
2 SEG AS (SELECT SEGMENT_NAME, SUM(BYTES)/1024 K FROM USER_SEGMENTS GROUP BY SEGMENT_NAME),
3 OBJ AS (SELECT OBJECT_NAME, OBJECT_TYPE FROM USER_OBJECTS)
4 SELECT O.OBJECT_NAME, OBJECT_TYPE, NVL(S.K, 0) SIZE_K
5 FROM OBJ O, SEG S
6 WHERE O.OBJECT_NAME = S.SEGMENT_NAME (+)
7 ;
OBJECT_NAME OBJECT_TYPE SIZE_K
------------------------------ ------------------- ----------
DAIJC_TEST TABLE 128
P_TEST PROCEDURE 0
IND_DAIJC_TEST_C1 INDEX 128

ã€€ã€€é€šè¿‡WITHè¯å¥å®šä¹‰äº?ji¨£n)ä¸¤ä¸ªåæŸ¥è¯¢SEGå’ŒOBJåQŒåœ¨éšåŽçš„SELECTè¯å¥ä¸å¯ä»¥ç›´æŽ¥å¯¹é¢„å®šä¹‰çš„åæŸ¥è¯¢è¿›è¡ŒæŸ¥è¯¢ã€‚ä»Žä¸Šé¢çš„ä¾‹åä¹Ÿå¯ä»¥çœ‹å‡ºåQŒä‹Éç”¨WITHè¯å¥åQŒå°†ä¸€ä¸ªåŒ…å«èšé›†ã€å¤–˜qžæŽ¥½{‰æ“ä½œSQLæ¸…æ™°çš„å±•çŽ°å‡ºæ¥ã€?/span>

ã€€ã€€WITHå®šä¹‰çš„åæŸ¥è¯¢ä¸ä»…å¯ä»¥ä½¿æŸ¥è¯¢è¯å¥æ›´åŠ ç®€å•ã€æ¸…æ™ŽÍ¼Œè€Œä¸”WITHå®šä¹‰çš„åæŸ¥è¯¢˜q˜å…·æœ‰åœ¨SELECTè¯å¥çš„ä“Qæ„å±‚å‡å¯è§çš„ç‰¹ç‚¹ã€?/span>

ã€€ã€€å³ä‹Éæ˜¯åœ¨WITHçš„å®šä¹‰å±‚ä¸ï¼ŒåŽå®šä¹‰çš„åæŸ¥è¯¢éƒ½å¯ä»¥ä½¿ç”¨å‰é¢å·²ç»å®šä¹‰å¥½çš„åæŸ¥è¯?

SQL> WITH
2 Q1 AS (SELECT 3 + 5 S FROM DUAL),
3 Q2 AS (SELECT 3 * 5 M FROM DUAL),
4 Q3 AS (SELECT S, M, S + M, S * M FROM Q1, Q2)
5 SELECT * FROM Q3;
S M S+M S*M
---------- ---------- ---------- ----------
8 15 23 120

ã€€ã€€åˆ©ç”¨WITHå®šä¹‰æŸ¥è¯¢ä¸å‡ºçŽ°å¤š‹Æ¡çš„åæŸ¥è¯¢è¿˜èƒ½å¸¦æ¥æ€§èƒ½æç¤ºã€‚Oracleä¼?x¨¬)å¯¹WITH˜q›è¡Œæ€§èƒ½ä¼˜åŒ–åQŒå½“éœ€è¦å¤š‹Æ¡è®¿é—®WITHå®šä¹‰çš„åæŸ¥è¯¢æ—Óž¼ŒOracleä¼?x¨¬)å°†åæŸ¥è¯¢çš„¾l“æžœæ”‘Öˆ°ä¸€ä¸ªäÍ(f¨´)æ—¶è¡¨ä¸ï¼Œé¿å…åŒæ ·çš„åæŸ¥è¯¢å¤šæ¬¡æ‰§è¡ŒåQŒä»Žè€Œæœ‰æ•ˆçš„å‡å°‘äº?ji¨£n)æŸ¥è¯¢çš„IOæ•°é‡ã€?/span>

WITHèƒ½ç”¨åœ¨SELECTè¯å¥ä¸ï¼ŒUPDATEå’ŒDELETEè¯å¥ä¹Ÿæ˜¯æ”¯æŒWITHè¯æ³•çš„ï¼Œåªæ˜¯éœ€è¦ç‰ˆæœ¬æ”¯æŒ?
http://www.oracle.com.cn/viewthread.php?tid=83530

=============================================================================
with
sql1 as (select to_char(a) s_name from test_tempa),
sql2 as (select to_char(b) s_name from test_tempb where not exists (select s_name from sql1 where rownum=1))
select * from sql1
union all
select * from sql2
union all
select 'no records' from dual
       where not exists (select s_name from sql1 where rownum=1)
       and not exists (select s_name from sql2 where rownum=1);

å†ä‹Dä¸ªç®€å•çš„ä¾‹å

with a as (select * from test)

select * from a;

å…¶å®žž®±æ˜¯æŠŠä¸€å¤§å †é‡å¤ç”¨åˆ°çš„SQLè¯å¥æ”‘Öœ¨with as é‡Œé¢åQŒå–ä¸€ä¸ªåˆ«åï¼ŒåŽé¢çš„æŸ¥è¯¢å°±å¯ä»¥ç”¨å®ƒ

˜q™æ ·å¯¹äºŽå¤§æ‰¹é‡çš„SQLè¯å¥èµ·åˆ°ä¸€ä¸ªä¼˜åŒ–çš„ä½œç”¨åQŒè€Œä¸”æ¸…æ¥šæ˜Žäº†(ji¨£n)

˜q™æ˜¯æœçƒ¦(ch¨³)åˆ°çš„è‹±æ–‡æ–‡æ¡£èµ„æ–™(è¯´å¾—æ¯”è¾ƒå…?ä½†æ˜¯æœ¬ähè‹±æ–‡ç‰¹èœ,˜q˜æ²¡å…·ä½“äº?ji¨£n)è§£å?å¸Œæœ›å„é«˜æ‰‹å…·ä½“è°ˆè°ˆè¿™ä¸ªwith
as çš„å¥½å¤?

About Oracle WITH clause
Starting in Oracle9i release 2 we see an incorporation of the SQL-99 “WITH clause”, a tool for materializing subqueries to save Oracle from having to re-compute them multiple times.

The SQL “WITH clause” is very similar to the use of Global temporary tables (GTT), a technique that is often used to improve query speed for complex subqueries. Here are some important notes about the Oracle “WITH clause”:

   ? The SQL “WITH clause” only works on Oracle 9i release 2 and beyond.
   ? Formally, the “WITH clause” is called subquery factoring
   ? The SQL “WITH clause” is used when a subquery is executed multiple times
   ? Also useful for recursive queries (SQL-99, but not Oracle SQL)

To keep it simple, the following example only references the aggregations once, where the SQL “WITH clause” is normally used when an aggregation is referenced multiple times in a query.
We can also use the SQL-99 “WITH clause” instead of temporary tables. The Oracle SQL “WITH clause” will compute the aggregation once, give it a name, and allow us to reference it (maybe multiple times), later in the query.

The SQL-99 “WITH clause” is very confusing at first because the SQL statement does not begin with the word SELECT. Instead, we use the “WITH clause” to start our SQL query, defining the aggregations, which can then be named in the main query as if they were “real” tables:

WITH
subquery_name
AS
(the aggregation SQL statement)
SELECT
(query naming subquery_name);

Retuning to our oversimplified example, let’s replace the temporary tables with the SQL “WITH clause”:

WITH
sum_sales AS
select /*+ materialize */
    sum(quantity) all_sales from stores
number_stores AS
select /*+ materialize */
    count(*) nbr_stores from stores
sales_by_store AS
select /*+ materialize */
store_name, sum(quantity) store_sales from
store natural join sales
SELECT
   store_name
FROM
   store,
   sum_sales,
   number_stores,
   sales_by_store
where
   store_sales > (all_sales / nbr_stores)
;

Note the use of the Oracle undocumented “materialize” hint in the “WITH clause”. The Oracle materialize hint is used to ensure that the Oracle cost-based optimizer materializes the temporary tables that are created inside the “WITH” clause. This is not necessary in Oracle10g, but it helps ensure that the tables are only created one time.

It should be noted that the “WITH clause” does not yet fully-functional within Oracle SQL and it does not yet support the use of “WITH clause” replacement for “CONNECT BY” when performing recursive queries.

To see how the “WITH clause” is used in ANSI SQL-99 syntax, here is an excerpt from Jonathan Gennick’s great work “Understanding the WITH Clause” showing the use of the SQL-99 “WITH clause” to traverse a recursive bill-of-materials hierarchy

The SQL-99 “WITH clause” is very confusing at first because the SQL statement does not begin with the word SELECT. Instead, we use the “WITH clause” to start our SQL query, defining the aggregations, which can then be named in the main query as if they were “real” tables:

WITH
subquery_name
AS
(the aggregation SQL statement)
SELECT
(query naming subquery_name);

Retuning to our oversimplified example, let’s replace the temporary tables with the SQL “WITH” clause”:

ç´«è¶âˆé£›æšâ†— 2011-12-06 16:47 å‘è¡¨è¯„è®º

]]>

Hibernate æ³¨è§£æ˜ å°„ è®„¡½®é»˜è®¤å€¼çš„å¼‚å¸¸å?qi¨¢ng)è§£å†Ïx–¹æ³?/title>http://www.aygfsteel.com/algz/articles/365534.htmlç´«è¶âˆé£›æšâ†—ç´«è¶âˆé£›æšâ†—Mon, 05 Dec 2011 01:21:00 GMThttp://www.aygfsteel.com/algz/articles/365534.htmlhttp://www.aygfsteel.com/algz/comments/365534.htmlhttp://www.aygfsteel.com/algz/articles/365534.html#Feedback0http://www.aygfsteel.com/algz/comments/commentRss/365534.htmlhttp://www.aygfsteel.com/algz/services/trackbacks/365534.html
Oracle æ•°æ®åº?
Hibernate annotation :
@Column(name="NUMBERS",columnDefinition="NUMBER(20,3) default 0 ")
public BigDecimal getNumbers() {
return numbers;
}

å¼‚å¸¸:
Caused by: org.hibernate.HibernateException: Wrong column type: NUMBERS, expected: NUMBER(20,3) default 0
at org.hibernate.mapping.Table.validateColumns(Table.java:261)
at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:1083)
at org.hibernate.tool.hbm2ddl.SchemaValidator.validate(SchemaValidator.java:116)
at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:317)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:730)
... 122 more
è§£å†³æ–ÒŽ(gu¨©)³•:
@Column(name="NUMBERS",columnDefinition="number(20,3) default 0 ")
public BigDecimal getNumbers() {
return numbers;
}
åŽŸå› :hibernate åœ¨åˆ—å®šä¹‰é€‰é¡¹ä¸?æ•°æ®åº“ä¸çš„æ‰€æœ‰ç±»åž‹åº”ä¸ºå°å†™number. hibernateåœ¨æ¤ç›´æŽ¥é¢å¯¹æ•°æ®åº?æ‰€ä»¥åŒºåˆ†å¤§ž®å†™.

ç´«è¶âˆé£›æšâ†— 2011-12-05 09:21 å‘è¡¨è¯„è®º
]]>[è½¬] Oracle è¯æ³•ä¹?OVER (PARTITION BY ..) å?qi¨¢ng)å¼€½H—å‡½æ•?/title><link>http://www.aygfsteel.com/algz/articles/365263.html</link><dc:creator>ç´«è¶âˆé£›æšâ†—</dc:creator><author>ç´«è¶âˆé£›æšâ†—</author><pubDate>Thu, 01 Dec 2011 02:00:00 GMT</pubDate><guid>http://www.aygfsteel.com/algz/articles/365263.html</guid><wfw:comment>http://www.aygfsteel.com/algz/comments/365263.html</wfw:comment><comments>http://www.aygfsteel.com/algz/articles/365263.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/algz/comments/commentRss/365263.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/algz/services/trackbacks/365263.html</trackback:ping><description><![CDATA[<span id="wmqeeuq" class="Apple-style-span" style="color: #454545; font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 14px; background-color: #ffffff; "><div>oracleçš„åˆ†æžå‡½æ•°over å?qi¨¢ng)å¼€½H—å‡½æ•?/div><div><font size="2">ä¸€åQšåˆ†æžå‡½æ•?strong style="color: black; background-color: #a0ffff; ">over</strong><br /><strong style="color: black; background-color: #ffff66; ">Oracle</strong>ä»?.1.6å¼€å§‹æä¾›åˆ†æžå‡½æ•ŽÍ¼Œåˆ†æžå‡½æ•°ç”¨äºŽè®¡ç®—åŸÞZºŽ¾l„çš„æŸç§èšåˆå€û|¼Œå®ƒå’Œèšåˆå‡½æ•°çš„ä¸åŒä¹‹å¤„æ˜¯<br />å¯¹äºŽæ¯ä¸ª¾l„è¿”å›žå¤šè¡Œï¼Œè€Œèšåˆå‡½æ•°å¯¹äºŽæ¯ä¸ªç»„åªè¿”å›žä¸€è¡Œã€?nbsp;<br />ä¸‹é¢é€šè¿‡å‡ ä¸ªä¾‹åæ¥è¯´æ˜Žå…¶åº”ç”¨ã€?nbsp; </font><div><font size="2">1åQšç»Ÿè®¡æŸå•†åº—çš„è¥ä¸šé¢ã€?nbsp; </font></div><div><font size="2"> date sale<br /> 1 20<br /> 2 15<br /> 3 14<br /> 4 18<br /> 5 30<br /> è§„åˆ™åQšæŒ‰å¤©ç»Ÿè®¡ï¼š(x¨¬)æ¯å¤©éƒ½ç»Ÿè®¡å‰é¢å‡ å¤©çš„æ€»é¢<br /> å¾—åˆ°çš„ç»“æžœï¼š(x¨¬)<br /> DATE SALE SUM<br /> ----- -------- ------<br /> 1 20 20 --1å¤?nbsp; <br /> 2 15 35 --1å¤©ï¼‹2å¤?nbsp; <br /> 3 14 49 --1å¤©ï¼‹2å¤©ï¼‹3å¤?nbsp; <br /> 4 18 67 . <br /> 5 30 97 .<br /> <br />2:¾lŸè®¡å„çæˆç‡W½W¬ä¸€åçš„åŒå¦ä¿¡æ¯</font></div><div><font size="2"> NAME CLASS S <br /> ----- ----- ---------------------- <br /> fda 1 80 <br /> ffd 1 78 <br /> dss 1 95 <br /> cfe 2 74 <br /> gds 2 92 <br /> gf 3 99 <br /> ddd 3 99 <br /> adf 3 45 <br /> asdf 3 55 <br /> 3dd 3 78 <br /> <br /> é€šè¿‡åQ?nbsp; <br /> --<br /> select * from <br /> ( <br /> select name,class,s,rank()<strong style="color: black; background-color: #a0ffff; ">over</strong>(partition by class order by s desc) mm from t2<br /> ) <br /> where mm=1 <br /> --<br /> å¾—åˆ°¾l“æžœåQ?br /> NAME CLASS S MM <br /> ----- ----- ---------------------- ---------------------- <br /> dss 1 95 1 <br /> gds 2 92 1 <br /> gf 3 99 1 <br /> ddd 3 99 1 <br /> <br /> æ³¨æ„åQ?br /> 1.åœ¨æ±‚½W¬ä¸€åæˆ¾l©çš„æ—¶å€™ï¼Œä¸èƒ½ç”¨row_number()åQŒå› ä¸ºå¦‚æžœåŒçæœ‰ä¸¤ä¸ªòq¶åˆ—½W¬ä¸€åQŒrow_number()åªè¿”å›žä¸€ä¸ªç»“æž?nbsp; <br /> 2.rank()å’Œdense_rank()çš„åŒºåˆ«æ˜¯åQ?br /> --rank()æ˜¯èŸ©è·ƒæŽ’åºï¼Œæœ‰ä¸¤ä¸ªç¬¬äºŒåæ—¶æŽ¥ä¸‹æ¥ž®±æ˜¯½W¬å››å?br /> --dense_rank()læ˜¯è¿ž¾læŽ’åºï¼Œæœ‰ä¸¤ä¸ªç¬¬äºŒåæ—¶ä»ç„¶è·Ÿç€½W¬ä¸‰å?br /> <br /> <br />3.åˆ†ç±»¾lŸè®¡ (òq¶æ˜¾½CÞZ¿¡æ?</font></div><div><font size="2"> A B C <br /> -- -- ---------------------- <br /> m a 2 <br /> n a 3 <br /> m a 2 <br /> n b 2 <br /> n b 1 <br /> x b 3 <br /> x b 2 <br /> x b 4 <br /> h b 3</font></div><div><font size="2"> select a,c,sum(c)<strong style="color: black; background-color: #a0ffff; ">over</strong>(partition by a) from t2 <br /> å¾—åˆ°¾l“æžœåQ?br /> A B C SUM(C)<strong style="color: black; background-color: #a0ffff; ">OVER</strong>(PARTITIONBYA) <br /> -- -- ------- ------------------------ <br /> h b 3 3 <br /> m a 2 4 <br /> m a 2 4 <br /> n a 3 6 <br /> n b 2 6 <br /> n b 1 6 <br /> x b 3 9 <br /> x b 2 9 <br /> x b 4 9 <br /> <br /> å¦‚æžœç”¨sumåQŒgroup by åˆ™åªèƒ½å¾—åˆ?br /> A SUM(C) <br /> -- ---------------------- <br /> h 3 <br /> m 4 <br /> n 6 <br /> x 9 <br /> æ— æ³•å¾—åˆ°Båˆ—å€?nbsp; <br /> <br />åQï¼åQï¼åQ?/font></div><div><div><p><font face="verdana, arial, helvetica" size="2"><span id="wmqeeuq" class="javascript" id="text2200299" style="font-size: 12px; ">select * from test<br /><br />æ•°æ®:<br />A B C <br />1 1 1 <br />1 2 2 <br />1 3 3 <br />2 2 5 <br />3 4 6 <br /><br /><br />---ž®†Bæ ä½å€¼ç›¸åŒçš„å¯¹åº”çš„C æ ä½å€¼åŠ æ€?br />select a,b,c, SUM(C) OVER (PARTITION BY B) C_Sum<br />from test<br /><br />A B C C_SUM <br />1 1 1 1 <br />1 2 2 7 <br />2 2 5 7 <br />1 3 3 3 <br />3 4 6 6 <br /><br /><br /><br />---å¦‚æžœä¸éœ€è¦å·²æŸä¸ªæ ä½çš„å€¼åˆ†å‰?é‚£å°±è¦ç”¨ null<br /><br />eg: ž®±æ˜¯ž®†Cçš„æ ä½å€¼summary æ”‘Öœ¨æ¯è¡ŒåŽé¢<br /><br />select a,b,c, SUM(C) OVER (PARTITION BY null) C_Sum<br />from test<br /><br />A B C C_SUM <br />1 1 1 17 <br />1 2 2 17 <br />1 3 3 17 <br />2 2 5 17 <br />3 4 6 17</span></font></p><p><font face="verdana, arial, helvetica" size="2"></font> </p><p><font face="verdana, arial, helvetica" size="2"><span id="wmqeeuq" class="javascript" style="font-size: 12px; ">æ±‚ä¸ªäººå·¥èµ„å éƒ¨é—¨å·¥èµ„çš„ç™¾åˆ†æ¯”</span></font></p><font face="verdana, arial, helvetica" size="2"><p><font face="verdana, arial, helvetica" size="2"><span id="wmqeeuq" class="javascript" id="text3005546" style="font-size: 12px; ">SQL> select * from salary;<br /><br />NAME DEPT SAL<br />---------- ---- -----<br />a 10 2000<br />b 10 3000<br />c 10 5000<br />d 20 4000<br /><br />SQL> select name,dept,sal,sal100/sum(sal) over(partition by dept) percent from salary;<br /><br />NAME DEPT SAL PERCENT<br />---------- ---- ----- ----------<br />a 10 2000 20<br />b 10 3000 30<br />c 10 5000 50<br />d 20 4000 100</span></font></p></font></div></div><div><font size="2">äºŒï¼š(x¨¬)å¼€½H—å‡½æ•?nbsp; <br /> å¼€½H—å‡½æ•°æŒ‡å®šäº†(ji¨£n)åˆ†æžå‡½æ•°å·¥ä½œçš„æ•°æ®çª—å£å¤§ž®ï¼Œ˜q™ä¸ªæ•°æ®½H—å£å¤§å°å¯èƒ½ä¼?x¨¬)éšç€è¡Œçš„å˜åŒ–è€Œå˜åŒ–ï¼Œä¸¾ä¾‹å¦‚ä¸‹åQ?nbsp;<br />1åQ?nbsp; <br /> <strong style="color: black; background-color: #a0ffff; ">over</strong>åQˆorder by salaryåQ?æŒ‰ç…§salaryæŽ’åº˜q›è¡Œç´¯è®¡åQŒorder byæ˜¯ä¸ªé»˜è®¤çš„å¼€½H—å‡½æ•?br /> <strong style="color: black; background-color: #a0ffff; ">over</strong>åQˆpartition by deptnoåQ‰æŒ‰ç…§éƒ¨é—¨åˆ†åŒ?br />2åQ?br /> <strong style="color: black; background-color: #a0ffff; ">over</strong>åQˆorder by salary range between 5 preceding and 5 followingåQ?br /> æ¯è¡Œå¯¹åº”çš„æ•°æ®çª—å£æ˜¯ä¹‹å‰è¡Œå¹…åº¦å€ég¸‘…è¿‡5åQŒä¹‹åŽè¡Œòq…åº¦å€ég¸‘…è¿‡5<br /> ä¾‹å¦‚:å¯¹äºŽä»¥ä¸‹åˆ?br /> aa<br /> 1<br /> 2<br /> 2<br /> 2<br /> 3<br /> 4<br /> 5<br /> 6<br /> 7<br /> 9<br /> <br /> sum(aa)<strong style="color: black; background-color: #a0ffff; ">over</strong>åQˆorder by aa range between 2 preceding and 2 followingåQ?br /> å¾—å‡ºçš„ç»“æžœæ˜¯<br /> AA SUM<br /> ---------------------- ------------------------------------------------------- <br /> 1 10 <br /> 2 14 <br /> 2 14 <br /> 2 14 <br /> 3 18 <br /> 4 18 <br /> 5 22 <br /> 6 18 <br /> 7 22 <br /> 9 9 <br /> <br /> ž®±æ˜¯è¯ß_(d¨¢)¼Œå¯¹äºŽaa=5çš„ä¸€è¡?åQŒsumä¸?nbsp; 5-1<=aa<=5+2 çš„å’Œ<br /> å¯¹äºŽaa=2æ¥è¯´ åQŒsum=1+2+2+2+3+4=14 åQ?br /> åˆå¦‚ å¯¹äºŽaa=9 åQ?-1<=aa<=9+2 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href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2011-12-01 10:00 <a href="http://www.aygfsteel.com/algz/articles/365263.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]></description></item><item><title>sql plusæ“ä½œoracel(windowsòq›_°)åŸºç¡€ä¹‹ç®€æ˜“æ–°æ‰‹ç¯‡</h1> <p>ç´«è¶âˆé£›æšâ†— — Wed, 10 Aug 2011 03:29:00 GMT</p> <p style="color: #85a246" align="center"></p><div style="text-align: left;"><span style="color: #000000; ">æ³?ç™Õd…¥SQLPLUSæ—¶æŠ¥é”?å¦‚ä¸‹:</span><br><span style="color: #000000; ">è¯¯‚¾“å…¥ç”¨æˆ·å: system</span></div><div><div style="text-align: left;"><span style="color: #000000; ">è¾“å…¥å£ä×o(h¨´):</span></div><div style="text-align: left;"><span style="color: #000000; ">ERROR:</span></div><div style="text-align: left;"><span style="color: #000000; ">ORA-12560: TNS: åè®®é€‚é…å™¨é”™è¯?br /></span><span style="color: #000000; ">åŽŸå› :<div style="display: inline-block; "></div></span><span style="color: #000000; ">æ˜¯ORCALå®žä¾‹æ²¡å¯åŠ?net [start/stop] æœåŠ¡å?.ä¸ŽLinuxç›¸å,ä¸åœ¨SQLPLUSä¸å¯åŠ¨å®žä¾?</span></div></div><br>òq›_°: windows server 2003 Enterprise Editon , oracle 10g(10.02.00.01)<br><p> </p> <ol> <li>˜qè¡Œ"å¼€å§?>½E‹åº\Oracle - OraDb10g_home1\é…ç½®å’Œç§»æ¤å·¥å…?ä¸çš„"Database Configuration Assistant"åQŒåˆ›å»ÞZ¸€ä¸ªæ•°æ®åº“ã€? </li><li>åˆ›å¾æˆåŠŸåŽï¼Œ˜qè¡Œ"å¼€å§?>½E‹åº\Oracle - OraDb10g_home1\åº”ç”¨½E‹åºå¼€å?ä¸çš„"SQL Plus".ç”¨æˆ·åï¼š(x¨¬)sys å¯†ç åQ?23456 as sysdba(å¯†ç åŽé¢è¦åŠ ½Iºæ ¼as½Iºæ ¼sysdba) ä¸ÀLœºå—ç¬¦ä¸ÔŒ¼š(x¨¬)å¦‚æžœæ˜¯æœ¬æœºå¯ä¸å¡«ã€? </li><li> <p style="line-height: 150%; margin-right: 5px; margin-left: 5px; ">ä»Žå‘½ä»¤æ½Cºç¬¦ä¸‹ä‹Éç”¨sqlplus<br>sqlplus/nolog <br>conn ç”¨æˆ·å?å¯†ç as sysdba å‡ºçŽ°”å·²è¿žæŽ?#8220;åŽå°±æ˜¯æˆåŠŸäº†(ji¨£n)ã€?br /></p></li></ol>ã€€ã€€ã€€ã€€<br>ã€€ã€€æŽ¥ä¸‹æ¥ï¼Œæˆ‘ä»¬åœ¨SQLPlusä¸å®žæˆ˜ä¸€ä¸‹ï¼Œä¸ºæˆ‘ä»¬ä¸‹é¢å°†è¦åšçš„æ‰“å¥½åŸº¼‹€ã€?br 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date,<br>ã€€ã€€product_id integer not null,<br>ã€€ã€€uword varchar2(100),<br>ã€€ã€€constraint orders_pk primary key(order_id),<br>ã€€ã€€constraint orders_fk foreign key(product_id) references product(product_id)<br>ã€€ã€€);<br>ã€€ã€€<br>ã€€ã€€create table admin(<br>ã€€ã€€admin_id integer not null,<br>ã€€ã€€adminname varchar2(20) not null,<br>ã€€ã€€password varchar2(20) not null,<br>ã€€ã€€constraint admin_pk primary key(admin_id)<br>ã€€ã€€);</strong> </article> <article> <h1>spring ä»€ä¹ˆæƒ…å†µä¸‹˜q›è¡Œäº‹åŠ¡å›žæ»š(é¢è¯•é¢?</h1> <p>ç´«è¶âˆé£›æšâ†— — Wed, 22 Jun 2011 03:53:00 GMT</p> springäº‹åŠ¡å›žæ»š.é»˜è®¤æƒ…å†µ,uncheckedå¼‚å¸¸,åŒ™¿è¡Œæ—¶å¼‚å¸¸runntimeExceptionå›žæ»šäº‹åŠ¡;checkedå¼‚å¸¸,å³Exceptionå¯try{}æ•èŽ·çš„ä¸ä¼?x¨¬)å›žæ?å½“ç„¶ä¹Ÿå¯é…ç½®springå‚æ•°è®©å…¶å›žæ»š.<br><br><div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2011-06-22 11:53 <a href="http://www.aygfsteel.com/algz/articles/352796.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]> </article> <article> <h1>spring ä¸?jdbcTemplate å¿«é€Ÿæ•°æ®åº“å¼€å?/title><link>http://www.aygfsteel.com/algz/articles/352789.html</link><dc:creator>ç´«è¶âˆé£›æšâ†—</dc:creator><author>ç´«è¶âˆé£›æšâ†—</author><pubDate>Wed, 22 Jun 2011 02:16:00 GMT</pubDate><guid>http://www.aygfsteel.com/algz/articles/352789.html</guid><wfw:comment>http://www.aygfsteel.com/algz/comments/352789.html</wfw:comment><comments>http://www.aygfsteel.com/algz/articles/352789.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/algz/comments/commentRss/352789.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/algz/services/trackbacks/352789.html</trackback:ping><description><![CDATA[<div style="background-color:#eeeeee;font-size:13px;border:1px solid #CCCCCC;padding-right: 5px;padding-bottom: 4px;padding-left: 4px;padding-top: 4px;width: 98%;word-break:break-all"><span style="color: #000000; "> </span><span style="color: #0000FF; ">public</span><span style="color: #000000; "> </span><span style="color: #0000FF; ">void</span><span style="color: #000000; "> execSQL(String fileName) {<br /> <br /> File myFile </span><span style="color: #000000; ">=</span><span style="color: #000000; "> </span><span style="color: #0000FF; ">new</span><span style="color: #000000; "> File(fileName);<br /> </span><span style="color: #0000FF; ">if</span><span style="color: #000000; "> (</span><span style="color: #000000; ">!</span><span style="color: #000000; ">myFile.exists()) {<br /> System.err.println(</span><span style="color: #000000; ">"</span><span style="color: #000000; ">Can't Find </span><span style="color: #000000; ">"</span><span style="color: #000000; "> </span><span style="color: #000000; ">+</span><span style="color: #000000; "> fileName);<br /> </span><span style="color: #0000FF; ">return</span><span style="color: #000000; ">;<br /> }<br /> </span><span style="color: #0000FF; ">try</span><span style="color: #000000; "> {<br /> DriverManagerDataSource dataSource</span><span style="color: #000000; ">=</span><span style="color: #0000FF; ">new</span><span style="color: #000000; "> DriverManagerDataSource();<br /> dataSource.setDriverClassName(</span><span style="color: #000000; ">"</span><span style="color: #000000; ">org.hsqldb.jdbcDriver</span><span style="color: #000000; ">"</span><span style="color: #000000; ">);<br /> dataSource.setUrl(</span><span style="color: #000000; ">"</span><span style="color: #000000; ">jdbc:hsqldb:hsql://localhost/algz</span><span style="color: #000000; ">"</span><span style="color: #000000; ">);<br /> dataSource.setUsername(</span><span style="color: #000000; ">"</span><span style="color: #000000; ">sa</span><span style="color: #000000; ">"</span><span style="color: #000000; ">);<br /> dataSource.setPassword(</span><span style="color: #000000; ">""</span><span style="color: #000000; ">);<br /> JdbcTemplate jt</span><span style="color: #000000; ">=</span><span style="color: #0000FF; ">new</span><span style="color: #000000; "> JdbcTemplate();<br /> jt.setDataSource(dataSource);<br /> <br /> <br /> BufferedReader in </span><span style="color: #000000; ">=</span><span style="color: #000000; "> </span><span style="color: #0000FF; ">new</span><span style="color: #000000; "> BufferedReader(</span><span style="color: #0000FF; ">new</span><span style="color: #000000; "> FileReader(myFile));<br /> String sql;<br /> </span><span style="color: #0000FF; ">while</span><span style="color: #000000; "> ((sql </span><span style="color: #000000; ">=</span><span style="color: #000000; "> in.readLine()) </span><span style="color: #000000; ">!=</span><span style="color: #000000; "> </span><span style="color: #0000FF; ">null</span><span style="color: #000000; ">) {<br /> jt.execute(sql);<br /> System.out.print(</span><span style="color: #000000; ">"</span><span style="color: #000000; ">.</span><span style="color: #000000; ">"</span><span style="color: #000000; ">);<br /> }<br /> <br /> in.close();<br /> System.out.println();<br /> } </span><span style="color: #0000FF; ">catch</span><span style="color: #000000; "> (IOException e) {<br /> e.getStackTrace();<br /> }<br /> }</span></div><img src ="http://www.aygfsteel.com/algz/aggbug/352789.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2011-06-22 10:16 <a href="http://www.aygfsteel.com/algz/articles/352789.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]></description></item><item><title>oracle å˜å‚¨˜q‡ç¨‹åŸºæœ¬è¯æ³•å?qi¨¢ng)é—®é?/title><link>http://www.aygfsteel.com/algz/articles/352675.html</link><dc:creator>ç´«è¶âˆé£›æšâ†—</dc:creator><author>ç´«è¶âˆé£›æšâ†—</author><pubDate>Mon, 20 Jun 2011 09:12:00 GMT</pubDate><guid>http://www.aygfsteel.com/algz/articles/352675.html</guid><wfw:comment>http://www.aygfsteel.com/algz/comments/352675.html</wfw:comment><comments>http://www.aygfsteel.com/algz/articles/352675.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/algz/comments/commentRss/352675.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/algz/services/trackbacks/352675.html</trackback:ping><description><![CDATA[<div><div>å˜å‚¨˜q‡ç¨‹</div><div>æ³?: </div><div>(1)åœ¨procedureä¸æƒ³ç”¨ddlåQŒå°±å¿…é¡»ç”¨execute immediat 'create table text1(id int not null primary key)';</div><div>ä¸”å¿…™åÀL˜¾æŽˆæƒ(grant create any table to ç”¨æˆ·å?,å¦åˆ™æŠ?insufficient privileges',æ— æƒé™?</div><div>(2)æ¯æ¡è¯å¥éƒ½éœ€ä»?;'¾l“å°¾.</div><div></div><div>1.åŸºæœ¬è¯æ³• : åˆ›å¾ä¸€ä¸ªå˜å‚¨è¿‡½E?å¦‚æžœå˜åœ¨ž®Þp¦†ç›? (æ³?as/isæ²¡åŒºåˆ?åªæ˜¯å…¼å®¹åˆ«çš„SQLè€Œå·²)</div><div>create or replace procedure ˜q‡ç¨‹å?å‚æ•°1 in number ,å‚æ•°2 in number) is</div><div>å˜é‡1 integer:=0;</div><div>å˜é‡2 date;</div><div>exp exception; --å®šä¹‰å¼‚å¸¸</div><div>begin</div><div> --å˜å‚¨˜q‡ç¨‹ä¸è°ƒç”¨DDL,å¿…é¡»ç”¨åŠ¨æ€SQLæ–ÒŽ(gu¨©)³•</div><div> execute immediate ' create table testtable (testid int not null primary key,testname varchar2(10) ) ';</div><div> execute immediate 'insert into testtable values(1,110) '; </div><div></div><div> raise exp; --æŠ›å‡ºå¼‚å¸¸</div><div>exception --å¼‚å¸¸å¤„ç†</div><div> when exp then </div><div> dbms_output.put_line( 'æ‰§è¡ŒæˆåŠŸ1 '); --æŽ§åˆ¶å°æ‰“å?/div><div> when others then </div><div> dbms_output.put_line( 'æ‰§è¡Œå¤ÞpÓ|0 '); </div><div></div><div>end;</div><div></div><div>2.åŸºæœ¬è¯å¥:</div><div>(1)å˜é‡èµ‹å€?/div><div><1>å˜é‡åˆå§‹åŒ–èµ‹å€?=å€?</div><div><2>å˜é‡èµ‹å€? select ....into... from ....; --select ... from ... æ–ÒŽ(gu¨©)³•åœ¨å˜å‚¨è¿‡½E‹ä¸æ—¶çš„æ ¼å¼</div><div>select name1,name2 into var1,var2 from table1 </div><div></div><div>(2)For å¾ªçŽ¯</div><div>For ... in ... LOOP</div><div>--æ‰§è¡Œè¯å¥</div><div>end LOOP;</div><div></div><div><1>å¾ªçŽ¯éåŽ†æ¸¸æ ‡</div><div>create or replace procedure test() as</div><div> Cursor cursor is select name from student; name varchar(20);</div><div>begin</div><div> for name in cursor LOOP</div><div> begin</div><div> dbms_output.putline(name); </div><div> end;</div><div> end LOOP;</div><div>end test;</div><div></div><div><2>å¾ªçŽ¯éåŽ†æ•°ç»„</div><div> create or replace procedure test(varArray in myPackage.TestArray) as</div><div>--(è¾“å…¥å‚æ•°varArray æ˜¯è‡ªå®šä¹‰çš„æ•°¾l„ç±»åž‹ï¼Œå®šä¹‰æ–¹å¼è§æ ‡é¢?)</div><div>i number;</div><div>begin</div><div>i := 1; --å˜å‚¨˜q‡ç¨‹æ•°ç»„æ˜¯è“vå§‹ä½¾|®æ˜¯ä»?å¼€å§‹çš„åQŒä¸Žjavaã€Cã€C++½{‰è¯a€ä¸åŒã€‚å› ä¸ºåœ¨Oracleä¸æœ¬æ˜¯æ²¡æœ‰æ•°¾l?/div><div></div><div>çš„æ¦‚å¿ëŠš„åQŒæ•°¾l„å…¶å®žå°±æ˜¯ä¸€å¼?/div><div>--è¡?Table),æ¯ä¸ªæ•°ç»„å…ƒç´ ž®±æ˜¯è¡¨ä¸çš„ä¸€ä¸ªè®°å½•ï¼Œæ‰€ä»¥éåŽ†æ•°¾l„æ—¶ž®Þq›¸å½“äºŽä»Žè¡¨ä¸çš„½W¬ä¸€æ¡è®°å½•å¼€å§‹éåŽ?/div><div>for i in 1..varArray.count LOOP </div><div>dbms_output.putline('The No.'|| i || 'record in varArray is:'||varArray(i)); </div><div> end LOOP;</div><div>end test;</div><div></div><div>3.ä»£ç æŠ›å‡ºå¼‚å¸¸ç”¨raise (å¼‚å¸¸å?;</div><div></div><div>4.æ¸¸æ ‡ : </div><div>(1)¾pÈ»Ÿ¾U§æ¸¸æ ?cursor SYS_REFCURSOR;åªèƒ½é€šè¿‡openæ–ÒŽ(gu¨©)³•æ‰“å¼€å’Œèµ‹å€?/div><div>OPEN cursor FOR select name1,name2 from table1 where a='1'; --sqlè¯æ³•</div><div>LOOP</div><div> FETCH cursor INTO name1,name2; --åªèƒ½é€šè¿‡fetch into æ‰“å¼€å’ŒéåŽ?/div><div> exit when cursor%NOTFOUND; --å¯ç”¨ä¸‰ä¸ªçŠ¶æ€?%NOTFOUND(æœªæ‰¾åˆ°è®°å½?;%FOUND(æ‰‘Öˆ°è®?/div><div></div><div>å½?;%ROWCOUNT(å½“å‰æ¸¸æ ‡æŒ‡å‘çš„è¡Œä½ç½®)</div><div></div><div> dbms_output.putline(name1||name2);</div><div>END LOOP;</div><div></div><div>5.˜qžæŽ¥˜qç®—½W?: || ,å?ABC'||'123' : ABC123</div><div></div><div>6.å•è¡Œæ³¨é‡Š: --;å¤šè¡Œ:/**/;</div></div><img src ="http://www.aygfsteel.com/algz/aggbug/352675.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2011-06-20 17:12 <a href="http://www.aygfsteel.com/algz/articles/352675.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]></description></item><item><title>mysql è§£å†³ä¸æ–‡ä¹Þq </h1> <p>ç´«è¶âˆé£›æšâ†— — Mon, 30 May 2011 08:15:00 GMT</p> ä¸€çœ‹å°±æ˜Žäº†(ji¨£n).ä¸Žæ•°æ®åº“çš„è¿žæŽ¥é‡‡ç”¨UTF-8.<br><br><div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2011-05-30 16:15 <a href="http://www.aygfsteel.com/algz/articles/351345.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]> </article> <article> <h1>[è½¬]sqlçš„left join å‘½ä×o(h¨´)è¯¦è§£</h1> <p>ç´«è¶âˆé£›æšâ†— — Wed, 10 Sep 2008 13:58:00 GMT</p>  ä¾‹è¡¨a <br> aid adate <br> 1 a1 <br> 2 a2 <br> 3 a3 <br> è¡¨b <br> bid bdate <br> 1 b1 <br> 2 b2 <br> 4 b4 <br> ä¸¤ä¸ªè¡¨a,bç›¸è¿žæŽ?è¦å–å‡ºidç›¸åŒçš„å—ŒD?<br> select * from a inner join b on a.aid = b.bid˜q™æ˜¯ä»…å–å‡ºåŒ¹é…çš„æ•°æ®. <br> æ¤æ—¶çš„å–å‡ºçš„æ˜? <br> 1 a1 b1 <br> 2 a2 b2 <br> é‚£ä¹ˆleft join æŒ? <br> select * from a left join b on a.aid = b.bid <br> é¦–å…ˆå–å‡ºaè¡¨ä¸æ‰€æœ‰æ•°æ?ç„¶åŽå†åŠ ä¸Šä¸Ža,båŒšw…çš„çš„æ•°æ® <br> æ¤æ—¶çš„å–å‡ºçš„æ˜? <br> 1 a1 b1 <br> 2 a2 b2 <br> 3 a3 ½Iºå—½W?<br> åŒæ ·çš„ä¹Ÿæœ‰right join <br> æŒ‡çš„æ˜¯é¦–å…ˆå–å‡ºbè¡¨ä¸æ‰€æœ‰æ•°æ?ç„¶åŽå†åŠ ä¸Šä¸Ža,båŒšw…çš„çš„æ•°æ® <br> æ¤æ—¶çš„å–å‡ºçš„æ˜? <br> 1 a1 b1 <br> 2 a2 b2 <br> 4 ½Iºå—½W?b4<br> <br> LEFT JOIN æˆ?LEFT OUTER JOINã€?<br> å·¦å‘å¤–è”æŽ¥çš„¾l“æžœé›†åŒ…æ‹?LEFT OUTER åå¥ä¸æŒ‡å®šçš„å·¦è¡¨çš„æ‰€æœ‰è¡ŒåQŒè€Œä¸ä»…ä»…æ˜¯è”æŽ¥åˆ—æ‰€åŒšw…çš„è¡Œã€‚å¦‚æžœå·¦è¡¨çš„æŸè¡Œåœ¨å³è¡¨ä¸æ²¡æœ‰åŒšw…è¡Œï¼Œåˆ™åœ¨ç›¸å…³è”çš„¾l“æžœé›†è¡Œä¸å³è¡¨çš„æ‰€æœ‰é€‰æ‹©åˆ—è¡¨åˆ—å‡ä¸ºç©ºå€¹{€?br /> <br> ------------http://www.phpweblog.net/zwws/archive/2007/02/23/944.html<br> <br><br><div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2008-09-10 21:58 <a href="http://www.aygfsteel.com/algz/articles/228220.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]> </article> <article> <h1>[è½¬]SQLä¸çš„left outer join,inner join,right outer joinç”¨æ³•</h1> <p>ç´«è¶âˆé£›æšâ†— — Wed, 10 Sep 2008 13:55:00 GMT</p>  1 å…³ç³»ä»£æ•°<br> åˆåÆˆæ•°æ®é›†åˆçš„ç†è®ºåŸº¼‹€æ˜¯å…³¾pÖM»£æ•ŽÍ¼Œå®ƒæ˜¯ç”±E.F.Coddäº?970òq´æå‡ºçš„ã€?br /> åœ¨å…³¾pÖM»£æ•°çš„å½¢å¼åŒ–è¯a€ä¸ï¼š(x¨¬)<br> ? ç”¨è¡¨ã€æˆ–è€…æ•°æ®é›†åˆè¡¨½Cºå…³¾pÀLˆ–è€…å®žä½“ã€?br /> ? ç”¨è¡Œè¡¨ç¤ºå…ƒç»„ã€?br /> ? ç”¨åˆ—è¡¨ç¤ºå±žæ€§ã€?br /> å…³ç³»ä»£æ•°åŒ…å«ä»¥ä¸‹8ä¸ªå…³¾p»è¿½Ž—ç¬¦<br> ? é€‰å–â€•â€•è¿”å›žæ»¡‘ÏxŒ‡å®šæ¡ä»¶çš„è¡Œã€?br /> ? æŠ•åª„(ji¨£ng)â€•â€•ä»Žæ•°æ®é›†åˆä¸è¿”å›žæŒ‡å®šçš„åˆ—ã€?br /> ? ½W›å¡ž®?d¨¡ng)ç§¯â€•â€•æ˜¯å…³ç³»çš„ä¹˜æ³•ï¼Œå®ƒå°†åˆ†åˆ«æ¥è‡ªä¸¤ä¸ªæ•°æ®é›†åˆä¸çš„è¡Œä»¥æ‰€æœ‰å¯èƒ½çš„æ–¹å¼˜q›è¡Œ¾l„åˆã€?br /> ? òq¶â€•â€•å…³¾pÈš„åŠ 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HQLæŸ¥è¯¢˜q”å›ž¾l“æžœä¸ºç©ºå€¼æˆ–æŠ¥ç©ºæŒ‡é’ˆé”™è¯¯æˆ–ç±»åž‹è{æ¢å¤±è´?<br /> è§£å†³æ–ÒŽ(gu¨©)³•: å› äØ“(f¨´)Hibernate é»˜è®¤å¤–é”®çš„å…³è”æ˜¯ä¸»é”®, æ‰€ä»¥éœ€åŠ ä¸Š<many-to-one property-ref="å…Œ™”¾cÈš„å±žæ€? ......> <br /> å…Œ™”¾c?HBM.XML--- <br /> <set name="as" inverse="true"><br /> <key property-ref="content"><br /> <column name="bc" length="45" not-null="true" /><br /> </key><br /> <one-to-many class="com.a.A" /><br /> </set> <img src ="http://www.aygfsteel.com/algz/aggbug/197804.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2008-05-02 22:55 <a href="http://www.aygfsteel.com/algz/articles/197804.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]></description></item><item><title>ä¸»è¡¨çš„é”®æ˜¯ä»Žè¡¨çš„å¤–é”®,å¤–é”®çš„çñ”è?</h1> <p>ç´«è¶âˆé£›æšâ†— — Mon, 07 Apr 2008 04:05:00 GMT</p>  ä»Žè¡¨: Næ–?<br> ä¸»è¡¨çš„é”®åˆ é™¤,ä»Žè¡¨ä¸Žä¹‹å¯¹åº”çš„å¤–é”®ä¹Ÿåˆ é™¤.<br> ä»Žè¡¨çš„å¤–é”®åˆ é™?ä¸»è¡¨æ— ååº?<br> ON DELETE/UPDATE CASCADE,åœ¨å¤–é”®å®šä¹‰æ—¶åŠ ä¸Š. <br> <br> ä»¥ä¸‹å†…å®¹æ‘˜è‡ª:http://www.jianglb.com/2007/09/02/mysql-foreign-key.html<br> <br> <p>å¤–é”®çš„ä½œç”¨ï¼š(x¨¬)</p> <p>ä¿æŒæ•°æ®ä¸€è‡´æ€§ï¼Œå®Œæ•´æ€§ï¼Œä¸»è¦ç›®çš„æ˜¯æŽ§åˆ¶å˜å‚¨åœ¨å¤–é”®è¡¨ä¸çš„æ•°æ®ã€?ä½¿ä¸¤å¼ è¡¨å½¢æˆå…Œ™”åQŒå¤–é”®åªèƒ½å¼•ç”¨å¤–è¡¨ä¸çš„åˆ—çš„å€û|¼<br> ä¾‹å¦‚åQ?br /> a b ä¸¤ä¸ªè¡?br /> aè¡¨ä¸å˜æœ‰ å®¢æˆ·åøP¼Œå®¢æˆ·åç§°<br> bè¡¨ä¸å˜æœ‰ æ¯ä¸ªå®¢æˆ·çš„è®¢å?br /> æœ‰äº†(ji¨£n)å¤–é”®å?br /> ä½ åªèƒ½åœ¨¼‹®ä¿¡b è¡¨ä¸æ²¡æœ‰å®¢æˆ·xçš„è®¢å•åŽåQŒæ‰å¯ä»¥åœ¨aè¡¨ä¸åˆ é™¤å®¢æˆ·x</p> <p>å»ºç«‹å¤–é”®çš„å‰æï¼š(x¨¬) æœ¬è¡¨çš„åˆ—å¿…é¡»ä¸Žå¤–é”®ç±»åž‹ç›¸å?å¤–é”®å¿…é¡»æ˜¯å¤–è¡¨ä¸»é”?ã€?</p> <p>æŒ‡å®šä¸»é”®å…³é”®å—ï¼š(x¨¬) foreign key(åˆ—å) </p> <p>å¼•ç”¨å¤–é”®å…³é”®å—ï¼š(x¨¬) references <å¤–é”®è¡¨å>(å¤–é”®åˆ—å) </p> <p>äº‹äšgè§¦å‘é™åˆ¶: on deleteå’Œon update , å¯è®¾å‚æ•°cascade(è·Ÿéšå¤–é”®æ”¹åŠ¨), restrict(é™åˆ¶å¤–è¡¨ä¸çš„å¤–é”®æ”¹åŠ¨),set Null(è®„¡©ºå€û|¼‰(j¨ª),set DefaultåQˆè®¾é»˜è®¤å€û|¼‰(j¨ª),[é»˜è®¤]no action </p> <p>ä¾‹å¦‚åQ?</p> <p>outTableè¡?ä¸»é”® id ¾cÕdž‹ int </p> <p>åˆ›å¾å«æœ‰å¤–é”®çš„è¡¨åQ?br /> create table temp(<br> id int,<br> name char(20),<br> foreign key(id) references outTable(id) on delete cascade on update cascade); </p> <p>è¯´æ˜ŽåQšæŠŠidåˆ?è®¾äØ“(f¨´)å¤–é”® å‚ç…§å¤–è¡¨outTableçš„idåˆ?å½“å¤–é”®çš„å€¼åˆ é™?æœ¬è¡¨ä¸å¯¹åº”çš„åˆ—ç›é™?å½“å¤–é”®çš„å€¼æ”¹å?æœ¬è¡¨ä¸å¯¹åº”çš„åˆ—å€¼æ”¹å˜ã€?</p> <br><br><div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2008-04-07 12:05 <a href="http://www.aygfsteel.com/algz/articles/191218.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]> </article> <article> <h1>[è½¬]åœ¨MySQLä¸åˆ©ç”¨å¤–é”®å®žçŽ°çñ”è”åˆ é™¤ï¼</h1> <p>ç´«è¶âˆé£›æšâ†— — Mon, 07 Apr 2008 04:00:00 GMT</p>  <br> ä¸‹é¢åQŒæˆ‘ä»¬å…ˆåˆ›å¾ä»¥ä¸‹‹¹‹è¯•ç”¨æ•°æ®åº“è¡¨ï¼š(x¨¬) <br> <br> <pre><br> CREATE TABLE `roottb` ( <br> `id` INT(11) UNSIGNED AUTO_INCREMENT NOT NULL, <br> `data` VARCHAR(100) NOT NULL DEFAULT '', <br> PRIMARY KEY (`id`) <br> ) TYPE=InnoDB; <br> <br> CREATE TABLE `subtb` ( <br> `id` INT(11) UNSIGNED AUTO_INCREMENT NOT NULL, <br> `rootid` INT(11) UNSIGNED NOT NULL DEFAULT '0', <br> `data` VARCHAR(100) NOT NULL DEFAULT '', <br> PRIMARY KEY (`id`), <br> INDEX (`rootid`), <br> FOREIGN KEY (`rootid`) REFERENCES roottb(`id`) ON DELETE CASCADE <br> ) TYPE=InnoDB; <br> </pre> <br> <br> æ³¨æ„åQ?<br> 1ã€å¿…™åÖM‹Éç”¨InnoDBå¼•æ“ŽåQ?<br> 2ã€å¤–é”®å¿…™åÕd¾ç«‹çƒ¦(ch¨³)å¼•ï¼ˆINDEXåQ‰ï¼› <br> 3ã€å¤–é”®ç»‘å®šå…³¾p»è¿™é‡Œä‹Éç”¨äº†(ji¨£n)“ ON DELETE CASCADE”åQŒæ„æ€æ˜¯å¦‚æžœå¤–é”®å¯¹åº”æ•°æ®è¢«åˆ é™¤ï¼Œž®†å…³è”æ•°æ®å®Œå…¨åˆ é™¤ï¼Œæ›´å¤šä¿¡æ¯è¯·å‚è€ƒMySQLæ‰‹å†Œä¸å…³äºŽInnoDBçš„æ–‡æ¡£ï¼› <br> <br> å¥½ï¼ŒæŽ¥ç€æˆ‘ä»¬å†æ¥æ’å…¥‹¹‹è¯•æ•°æ®åQ?<br> <br> <pre><br> INSERT INTO `roottb` (`id`,`data`) <br> VALUES ('1', 'test root line 1'), <br> ('2', 'test root line 2'), <br> ('3', 'test root line 3'); <br> <br> INSERT INTO `subtb` (`id`,`rootid`,`data`) <br> VALUES ('1', '1', 'test sub line 1 for root 1'), <br> ('2', '1', 'test sub line 2 for root 1'), <br> ('3', '1', 'test sub line 3 for root 1'), <br> ('4', '2', 'test sub line 1 for root 2'), <br> ('5', '2', 'test sub line 2 for root 2'), <br> ('6', '2', 'test sub line 3 for root 2'), <br> ('7', '3', 'test sub line 1 for root 3'), <br> ('8', '3', 'test sub line 2 for root 3'), <br> ('9', '3', 'test sub line 3 for root 3'); <br> </pre> <br> <br> æˆ‘ä»¬å…ˆçœ‹ä¸€ä¸‹å½“å‰æ•°æ®è¡¨çš„çŠ¶æ€ï¼š(x¨¬) <br> <br> <pre><br> mysql>; show tables; <br> +----------------+ <br> | Tables_in_test | <br> +----------------+ <br> | roottb | <br> | subtb | <br> +----------------+ <br> 2 rows in set (0.00 sec) <br> <br> mysql>; select * from `roottb`; <br> +----+------------------+ <br> | id | data | <br> +----+------------------+ <br> | 1 | test root line 1 | <br> | 2 | test root line 2 | <br> | 3 | test root line 3 | <br> +----+------------------+ <br> 3 rows in set (0.05 sec) <br> <br> mysql>; select * from `subtb`; <br> +----+--------+----------------------------+ <br> | id | rootid | data | <br> +----+--------+----------------------------+ <br> | 1 | 1 | test sub line 1 for root 1 | <br> | 2 | 1 | test sub line 2 for root 1 | <br> | 3 | 1 | test sub line 3 for root 1 | <br> | 4 | 2 | test sub line 1 for root 2 | <br> | 5 | 2 | test sub line 2 for root 2 | <br> | 6 | 2 | test sub line 3 for root 2 | <br> | 7 | 3 | test sub line 1 for root 3 | <br> | 8 | 3 | test sub line 2 for root 3 | <br> | 9 | 3 | test sub line 3 for root 3 | <br> +----+--------+----------------------------+ <br> 9 rows in set (0.01 sec) <br> </pre> <br> <br> å—¯ï¼Œä¸€åˆ‡éƒ½æ£å¸¸åQŒå¥½åQŒä¸‹é¢æˆ‘ä»¬è¦è¯•éªŒæˆ‘ä»¬çš„çñ”è”åˆ é™¤åŠŸèƒ½äº†(ji¨£n)ã€?<br> <br> æˆ‘ä»¬ž®†åªåˆ é™¤roottbè¡¨ä¸idä¸?çš„æ•°æ®è®°å½•ï¼Œçœ‹çœ‹subtbè¡¨ä¸rootidä¸?çš„ç›¸å…›_¾Uªå½•æ˜¯å¦ä¼?x¨¬)è‡ªåŠ¨åˆ é™¤ï¼?x¨¬) <br> <br> <pre><br> mysql>; delete from `roottb` where `id`='2'; <br> Query OK, 1 row affected (0.03 sec) <br> <br> mysql>; select * from `roottb`; <br> +----+------------------+ <br> | id | data | <br> +----+------------------+ <br> | 1 | test root line 1 | <br> | 3 | test root line 3 | <br> +----+------------------+ <br> 2 rows in set (0.00 sec) <br> <br> mysql>; select * from `subtb`; <br> +----+--------+----------------------------+ <br> | id | rootid | data | <br> +----+--------+----------------------------+ <br> | 1 | 1 | test sub line 1 for root 1 | <br> | 2 | 1 | test sub line 2 for root 1 | <br> | 3 | 1 | test sub line 3 for root 1 | <br> | 7 | 3 | test sub line 1 for root 3 | <br> | 8 | 3 | test sub line 2 for root 3 | <br> | 9 | 3 | test sub line 3 for root 3 | <br> +----+--------+----------------------------+ <br> 6 rows in set (0.01 sec) <br> </pre> <br> <br> å—¯ï¼Œçœ‹subtbè¡¨ä¸å¯¹åº”æ•°æ®¼‹®å®žè‡ªåŠ¨åˆ é™¤äº?ji¨£n)ï¼Œ‹¹‹è¯•æˆåŠŸã€?<br> <br> ¾l“è®ºåQšåœ¨MySQLä¸åˆ©ç”¨å¤–é”®å®žçŽ°çñ”è”åˆ é™¤æˆåŠŸï¼<br> <br> -----------è½¬å¸–:http://www.chinaunix.net/jh/17/462977.html <br><br><div align="right"><a style="text-decoration:none;" href="http://www.aygfsteel.com/algz/" target="_blank">ç´«è¶âˆé£›æšâ†—</a> 2008-04-07 12:00 <a href="http://www.aygfsteel.com/algz/articles/191215.html#Feedback" target="_blank" style="text-decoration:none;">å‘è¡¨è¯„è®º</a></div>]]> </article> </main></body></html>

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