Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 (f&V 7n
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 fQ 9af)d
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 (Mfqzy
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 .uA
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分页支持类: 0")_%
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java代码: Zg_b(ks
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package com.javaeye.common.util; O.dZ3!!+
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import java.util.List; !S<p"
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publicclass PaginationSupport { glch06
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publicfinalstaticint PAGESIZE = 30; I]HYqI
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privateint pageSize = PAGESIZE; NkUY_rKPb
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privateList items; !IJ
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privateint totalCount; n'ZPB
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privateint[] indexes = newint[0]; i{}m 8K)
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privateint startIndex = 0; s {*rBX8N
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public PaginationSupport(List items, int t,Tq3zB
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totalCount){ v1$}[&/
setPageSize(PAGESIZE); \&d1bq
setTotalCount(totalCount); lGet)/w;c
setItems(items); ZW))Mx#K=T
setStartIndex(0); E7$ aT^
} LI-ewea
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public PaginationSupport(List items, int V~Guw[RA
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totalCount, int startIndex){ O4nA?bA
setPageSize(PAGESIZE); fm#7}Y
setTotalCount(totalCount); D8k >f ]
setItems(items); uaD+G:{[
setStartIndex(startIndex); aAcQmq TT
} yodhDSO5i
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public PaginationSupport(List items, int *r4FOA%P
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totalCount, int pageSize, int startIndex){
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setPageSize(pageSize); 7yG%E
setTotalCount(totalCount); rXSw@pqZ&
setItems(items); hB'rkjt
setStartIndex(startIndex); k'v+/6 Y
} C^?/9\
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publicList getItems(){ 3
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return items; dM"5obEb
} ,H|K3nh
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publicvoid setItems(List items){ u$qasII
this.items = items; VaonG]Ues
} ;Zf7|i`R3
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publicint getPageSize(){ 9AWP`~l`
return pageSize; ']!wc8m1"
} [$6YPM>Ee
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publicvoid setPageSize(int pageSize){ }w=|"a|,
this.pageSize = pageSize; a'q&[08
} L{ej<0 yr
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publicint getTotalCount(){ -{oZK{a1
return totalCount; WM9({BZ
} ;<MHl[jJD
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publicvoid setTotalCount(int totalCount){ Ga^:y=m
if(totalCount > 0){ "6~+-_:
this.totalCount = totalCount; 6XAofN/5f
int count = totalCount / !;t6\Z8&
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pageSize; <UIE-#
if(totalCount % pageSize > 0) >y!R}`&0^t
count++; 'K23oQwDB
indexes = newint[count]; k/Urz*O
for(int i = 0; i < count; i++){ FrRUAoFO
indexes = pageSize * A(XX2f!i
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} >N0L
}else{ cI6Td*vM
this.totalCount = 0; ?:5/4YC
} (s+}l?
} tI0D{Xrc
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publicint[] getIndexes(){ yJw.z#bB#
return indexes; sVlQ5M oo(
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publicvoid setIndexes(int[] indexes){ fn5!Nr ,
this.indexes = indexes; SJ,];mC0
} D;:p6q}hT
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publicint getStartIndex(){ z+c8G
return startIndex; "?_af
} Q{
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publicvoid setStartIndex(int startIndex){ fG@]G9Z
if(totalCount <= 0) ]P_yN:~
this.startIndex = 0; zq$0 ?vGd
elseif(startIndex >= totalCount) bdBLfWe
this.startIndex = indexes ;e2D}
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[indexes.length - 1]; y
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elseif(startIndex < 0) i"^ yy+
this.startIndex = 0; 7 $Cv=8
else{ R_80J=%0
this.startIndex = indexes s?9`dv}P
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[startIndex / pageSize]; S2
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} p8iKZI]g
} Q0XSQ Ol
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publicint getNextIndex(){ 7<*g'6JG[
int nextIndex = getStartIndex() + |lIgvHgg
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pageSize; 5z.Y}
if(nextIndex >= totalCount) Xag#ZT
return getStartIndex(); Eh *u6K)Z
else R,l*@3Q
return nextIndex; #=ko4?Wr(
} }'p*C$
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publicint getPreviousIndex(){ 0Y!~xyg/
int previousIndex = getStartIndex() - y+',jM
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pageSize; ]0")iY_
if(previousIndex < 0) EO/TuKt
return0; ,H/BW`rL]#
else N.V5>2
return previousIndex; $%1oZ{&M
} T'5MO\
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} S<I9`k G
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抽象业务类 Nm#[ A4
java代码: Jn\>Sz(96
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/** qjN*oM,
* Created on 2005-7-12 ;YrmT9Jx6
*/ fKkS_c
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package com.javaeye.common.business; 9$ixjkIg
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import java.io.Serializable; LP>GM=S#"
import java.util.List; dp }zG+
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import org.hibernate.Criteria; DNRWE1P2bg
import org.hibernate.HibernateException; o}L\b,])
import org.hibernate.Session; Vo(bro4ZQi
import org.hibernate.criterion.DetachedCriteria; 5QG?*Z~?7
import org.hibernate.criterion.Projections; i&L!?6 5-f
import =pb ru=/
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org.springframework.orm.hibernate3.HibernateCallback; nYTPcT4x|
import 3g3Znb
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org.springframework.orm.hibernate3.support.HibernateDaoS .bNG:y>
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upport; |cl*wFm|3
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import com.javaeye.common.util.PaginationSupport; dSE"G>l8
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public abstract class AbstractManager extends q`UaJ_7
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HibernateDaoSupport { ygQe'S{!S\
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privateboolean cacheQueries = false; %^[D+1ULb
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privateString queryCacheRegion; A#Y:VavQ?
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publicvoid setCacheQueries(boolean P~%+KxwZQ
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cacheQueries){
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this.cacheQueries = cacheQueries; U>DCra;
} iUk#hLLC
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publicvoid setQueryCacheRegion(String <T&v\DN
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queryCacheRegion){ h}kJ,n
this.queryCacheRegion = u08QE,
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queryCacheRegion; RGrQ>'RL
} YrV@k*O*
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publicvoid save(finalObject entity){ 7Gy:T47T\@
getHibernateTemplate().save(entity); A0:rn\$l3
} -&=dl_m
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publicvoid persist(finalObject entity){ 8:>V'j
getHibernateTemplate().save(entity); eze%RjO}
} b` va\'&3
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publicvoid update(finalObject entity){ jFUpf.v2
getHibernateTemplate().update(entity); 8QoxU"
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} %D5F7wB
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publicvoid delete(finalObject entity){ Rc
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getHibernateTemplate().delete(entity); Pc2!OQC'""
} hidQO h
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publicObject load(finalClass entity, ^\&FowpP
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finalSerializable id){ |<5F08]v
return getHibernateTemplate().load _TGs .t
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(entity, id); S0QLM)
} H!&_Tv[
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publicObject get(finalClass entity, ][
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finalSerializable id){ h<TZJCt
return getHibernateTemplate().get DA.k8M
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(entity, id); ,w3-*z
} p6R+t]oH
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publicList findAll(finalClass entity){ ^'0N%`bY!
return getHibernateTemplate().find("from HE%/+mZN
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" + entity.getName()); oJ\g0|\qwe
} f?51sr
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publicList findByNamedQuery(finalString bXOKC
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namedQuery){ #$x,PeG
return getHibernateTemplate DZtpY{=Z
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().findByNamedQuery(namedQuery); hHU=lnO
} BB\GrD
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publicList findByNamedQuery(finalString query, ekL;SN
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finalObject parameter){ gTXpaB<
return getHibernateTemplate 7I
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().findByNamedQuery(query, parameter); $R/@8qnP
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} Cl<!S`
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publicList findByNamedQuery(finalString query, ]690ey$E:j
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finalObject[] parameters){ mn?F;=qE
return getHibernateTemplate N*}soMPV^.
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().findByNamedQuery(query, parameters); B_Q{B|eEt&
} fq6Obh=A#
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publicList find(finalString query){ x?{UWh%
return getHibernateTemplate().find 1fS&KO{a
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(query); ,r w4Lo
} 6+IhI?lI=
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publicList find(finalString query, finalObject =#Sw.N
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parameter){ <J&S[`U!
return getHibernateTemplate().find F tIcA"^N
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(query, parameter); ~~OFymQ%?q
} Z)`)9]*
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public PaginationSupport findPageByCriteria Snf_{A<
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(final DetachedCriteria detachedCriteria){ UPuoIfuqI
return findPageByCriteria ~Kw#^.$3T
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); P"_/P8
} ,IjZQ53q~
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public PaginationSupport findPageByCriteria p0@^1
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(final DetachedCriteria detachedCriteria, finalint t>\sP
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startIndex){ xQu|D>kv87
return findPageByCriteria Gaix6@X6'
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(detachedCriteria, PaginationSupport.PAGESIZE, 1#A$&'&\J;
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startIndex); )!"fUz$
} AoS7B:T;!
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public PaginationSupport findPageByCriteria (I>Ch)'
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(final DetachedCriteria detachedCriteria, finalint ;o9h|LRs
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pageSize, KxkBP/`3Q
finalint startIndex){ j7~FR{:j
return(PaginationSupport) $H)^o!
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getHibernateTemplate().execute(new HibernateCallback(){ pE5v~~9Ikv
publicObject doInHibernate >pv.,cj
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(Session session)throws HibernateException { 6zi>Q?] 1
Criteria criteria = ;g|Vt}a&4
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detachedCriteria.getExecutableCriteria(session); Oidf\%!mvR
int totalCount = 4ijtx)SA
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((Integer) criteria.setProjection(Projections.rowCount 'UX.Q7W
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()).uniqueResult()).intValue(); uZ+bo&
criteria.setProjection cM#rus?)+
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(null); uz8LF47@:-
List items = FZHA19Kb
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criteria.setFirstResult(startIndex).setMaxResults G|wtl(}3
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(pageSize).list(); @-$8)?`q
PaginationSupport ps = 6Tl6A>%s
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new PaginationSupport(items, totalCount, pageSize, Gw*Tz"
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startIndex); YF5}~M ymF
return ps; ]~TsmR[
} >i/jqT/
}, true); /DQYlNa
} -%asHDQ{
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public List findAllByCriteria(final XM$~HG
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DetachedCriteria detachedCriteria){ Xg)8}
return(List) getHibernateTemplate iGyetFqKw
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().execute(new HibernateCallback(){ .U1wVIM
publicObject doInHibernate 4E$MhP
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(Session session)throws HibernateException { qmrT dG
Criteria criteria = <kn2
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detachedCriteria.getExecutableCriteria(session); AxEyXT( h5
return criteria.list(); :j\7</uu
} 7)Toj
}, true); ;blL\|ch;
} }3Es&p$9
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public int getCountByCriteria(final Kd\0nf6
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DetachedCriteria detachedCriteria){ =ZgueUz,
Integer count = (Integer) +f3Rzx]
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getHibernateTemplate().execute(new HibernateCallback(){ 'Y?-."eKh
publicObject doInHibernate X~{6$J|]#i
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(Session session)throws HibernateException { 6= ?0&Bx&
Criteria criteria = 'HA{6v,y
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detachedCriteria.getExecutableCriteria(session); M8},RR@{
return xT*'p&ap
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criteria.setProjection(Projections.rowCount |$Yk)z3
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()).uniqueResult(); i<uU_g'M
} (Y1*Bs[l
}, true); Q):#6|u+
return count.intValue(); qCs/sW
} 8}QM~&&.
} 15:9JVH3D
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用户在web层构造查询条件detachedCriteria,和可选的 :V/".K-:J
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 &L6Ivpj-
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PaginationSupport的实例ps。 pW]j.JM
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ps.getItems()得到已分页好的结果集 2?,Jn&i5
ps.getIndexes()得到分页索引的数组 -P]O t>%S
ps.getTotalCount()得到总结果数 e!u]l
ps.getStartIndex()当前分页索引 (4H\ho8+mp
ps.getNextIndex()下一页索引 ] \yIHdcDi
ps.getPreviousIndex()上一页索引 0]d;)_`@
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 teok *'b:
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 /?.?1-HM
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一下代码重构了。 1AJ6NBC&c
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我把原本我的做法也提供出来供大家讨论吧: TQR5V\{&%
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首先,为了实现分页查询,我封装了一个Page类: %&L13:
java代码: z5@XFaQ
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/*Created on 2005-4-14*/ _S9)<RVI+
package org.flyware.util.page; 0i~U(qoI
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/** [F<E0rjwM
* @author Joa e-dkvPr
* :9&