Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 #2]*qgA4
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 |f_'(-v`E
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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 >Na. C(DZ
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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 /stvNIEa
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分页支持类: ,
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java代码: 3zsp6k V
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package com.javaeye.common.util; ]xRR/S4
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import java.util.List; 4Sh8w%s
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publicclass PaginationSupport { d(^8#4
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publicfinalstaticint PAGESIZE = 30; :Wbp|:N0
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privateint pageSize = PAGESIZE; kn:hxdZ
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privateList items; &4OOW;,?<
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privateint totalCount; `,AOxJ:$
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privateint[] indexes = newint[0]; 3I 0pHP5
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privateint startIndex = 0; / =9Y(v
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public PaginationSupport(List items, int A.b^?k%I
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totalCount){ B
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setPageSize(PAGESIZE); & %/p;::A
setTotalCount(totalCount); dOv\]
setItems(items); DOyO`TJi
setStartIndex(0); M4Cb(QAVP
} "E+;O,N-
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public PaginationSupport(List items, int /T6bc^nOW
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totalCount, int startIndex){ X>$Wf3
setPageSize(PAGESIZE); $6m@gW]N
setTotalCount(totalCount); vyS>3(NZ
setItems(items); =cRmaD
setStartIndex(startIndex); 2Pb+/1*ix
} kk5&lak2V
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public PaginationSupport(List items, int h GA2.{
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totalCount, int pageSize, int startIndex){ "d<ucj
setPageSize(pageSize); 6"iNh)
setTotalCount(totalCount); #pZeGI|'J
setItems(items); *
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setStartIndex(startIndex); =x+1A)Q
} SE*;6&yL
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publicList getItems(){ r)~?5d
return items; u.q3~~[=
} }h`z2%5o
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publicvoid setItems(List items){ $-/-%=
this.items = items; c)
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} 8(j]=n6r
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publicint getPageSize(){ y9mV6.r
return pageSize; @~vg=(ic(
} 2{RRaUoRb
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publicvoid setPageSize(int pageSize){ OybmyGHY
this.pageSize = pageSize; > 3x^jh
} +76'(@(1Y
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publicint getTotalCount(){ 1D[V{)#
return totalCount; 'bRf>=
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publicvoid setTotalCount(int totalCount){ 1PxRj
if(totalCount > 0){ <Z t ]V`-
this.totalCount = totalCount; bq5ySy{8
int count = totalCount / P'iX?+*
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pageSize; vE`;1UA}
if(totalCount % pageSize > 0) cFie;k
count++; j)G%I y[`
indexes = newint[count]; m\*ca3$
for(int i = 0; i < count; i++){ bv <^zuV
indexes = pageSize * ?1g`'q@T%
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} Zbl*U(KU?
}else{ *0oa2fz%
this.totalCount = 0; *DcIC]ao[
} AHr^G'
} hgYFR6VH
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publicint[] getIndexes(){ /Q W^v;^
return indexes; SeZ+&d
} zEQQ4)mA
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publicvoid setIndexes(int[] indexes){ 2.JrLBhN
this.indexes = indexes; O<wH+k[
} _!|$ i
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publicint getStartIndex(){ 2@T0QJ
return startIndex; RF8,qz
} ?lqqu#;8
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publicvoid setStartIndex(int startIndex){ bi-Am/9
if(totalCount <= 0) k~;~i)Eg
this.startIndex = 0; Tq*<J~-
elseif(startIndex >= totalCount) JoB-&r}\V*
this.startIndex = indexes |
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[indexes.length - 1]; !M }-N
elseif(startIndex < 0) ?!F<xi:
this.startIndex = 0; +?t&
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else{ Z 9cb
this.startIndex = indexes *fd:(dN|
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[startIndex / pageSize]; "=%YyH~WY
} _@?I)4n|
} qDg`4yX.}
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publicint getNextIndex(){ y+wy<[u
int nextIndex = getStartIndex() + i`6utOq
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pageSize; P5dD&
if(nextIndex >= totalCount) ve a$G~[%6
return getStartIndex(); ,]qc#KDq-1
else ,F!-17_vt
return nextIndex; )jwovS?V
} f7 ew<c\
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publicint getPreviousIndex(){ ]ml 'd
int previousIndex = getStartIndex() - } j6|+
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pageSize; Y$^vA[]c>
if(previousIndex < 0) ~y Dl& S
return0; "AqLR
else `{yD\qDyX
return previousIndex; = ?/6hB=7<
} .2P3 !KCL
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} U1yspHiZ
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抽象业务类 we}5'bS>
java代码: CyVi{"aF3
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/** t
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* Created on 2005-7-12 $Y$s*h_-/<
*/ nJgN2Z
package com.javaeye.common.business; !oRN,m[7)p
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import java.io.Serializable; cjLA7I.O
import java.util.List; M_?B*QZJI
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import org.hibernate.Criteria; 1_xkGc-z<
import org.hibernate.HibernateException; #RdcSrw)W!
import org.hibernate.Session; <|3F('Q"
import org.hibernate.criterion.DetachedCriteria; ,
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import org.hibernate.criterion.Projections; >_\]c-~<
import DDT]A<WUV
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org.springframework.orm.hibernate3.HibernateCallback; }
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org.springframework.orm.hibernate3.support.HibernateDaoS dn%'bt
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import com.javaeye.common.util.PaginationSupport; {poTA+i
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public abstract class AbstractManager extends 5P('SFq'=
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HibernateDaoSupport {
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privateboolean cacheQueries = false; Q\^BOdX^`
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privateString queryCacheRegion; wqE2n
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publicvoid setCacheQueries(boolean @71y:)W<
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cacheQueries){ : T4ap_Ycq
this.cacheQueries = cacheQueries; v49i.c9
} 1
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publicvoid setQueryCacheRegion(String nwDW<J{f|U
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queryCacheRegion){ U|+`Eth8(
this.queryCacheRegion = odvUU#l
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queryCacheRegion; Ac>GF
} +b dnTV6
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publicvoid save(finalObject entity){ Pj^Ccd'>=
getHibernateTemplate().save(entity); >LU !Z
} Nc(A5*
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publicvoid persist(finalObject entity){ Vx n-
getHibernateTemplate().save(entity); ZI!;~q
} MLmk=&d
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publicvoid update(finalObject entity){ X=k|SayE8
getHibernateTemplate().update(entity); kgX"I ?>d
} 0M}Ql5+h,
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publicvoid delete(finalObject entity){ x}7Xd P.2$
getHibernateTemplate().delete(entity); :y!{=[>M(
} yAJrdY"
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publicObject load(finalClass entity, y$|OE%S
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finalSerializable id){ DC$x}1
return getHibernateTemplate().load (jh0cy}|]
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(entity, id); {RH)&k&%
} Fz$^CMw5K
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publicObject get(finalClass entity, g+k
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finalSerializable id){ x1`Jlzrp,
return getHibernateTemplate().get j+3=&PkA.]
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(entity, id); ; JHf0
} *_uGzGB&G
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publicList findAll(finalClass entity){ #fF';Y7
return getHibernateTemplate().find("from hTAZGV(
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" + entity.getName()); gM
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} p:4oA<V
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publicList findByNamedQuery(finalString Znh<r[p<
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namedQuery){ PkdL] !:
return getHibernateTemplate Kx,<-]4
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().findByNamedQuery(namedQuery); bO gVCg
} 0 !F!Y_
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publicList findByNamedQuery(finalString query, n\4sNoFI
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finalObject parameter){ H[iR8<rhQ
return getHibernateTemplate KQrG|<J
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().findByNamedQuery(query, parameter); Jpo(O>\P
} NFb<fD[C
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publicList findByNamedQuery(finalString query, AhSN'gWpbF
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finalObject[] parameters){ E"Y[k8-:2/
return getHibernateTemplate Ivc/g,
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().findByNamedQuery(query, parameters); )L7h:%h#
} h!]=)7x;
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publicList find(finalString query){ Bjsg!^X7
return getHibernateTemplate().find \w@ "`!%
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(query); >o!~T}J7
} J?bx<$C@
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publicList find(finalString query, finalObject 8}!WJ2[R
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parameter){ Eg#WR&Uq"
return getHibernateTemplate().find ksli-Px
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(query, parameter); kt hy9<!$
} m2PI^?|e
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public PaginationSupport findPageByCriteria um1xSf1Xv
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(final DetachedCriteria detachedCriteria){ #?RT$L>n
return findPageByCriteria i~EFRI@
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); :0j_I\L
} rIWQD%Afm
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public PaginationSupport findPageByCriteria 5'[b:YC
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(final DetachedCriteria detachedCriteria, finalint CR'1,
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startIndex){ &X
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return findPageByCriteria {3*Zx"e![
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(detachedCriteria, PaginationSupport.PAGESIZE, @
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startIndex); di]TS9&9
} 5X,|Pn
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public PaginationSupport findPageByCriteria ~k'SP(6#C
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(final DetachedCriteria detachedCriteria, finalint Bh<6J&<n
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pageSize, {:c5/
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finalint startIndex){ BBlYy5x
return(PaginationSupport) ^;a~_9
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getHibernateTemplate().execute(new HibernateCallback(){ K)F6TvWv
publicObject doInHibernate ]?a i
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(Session session)throws HibernateException { e4(E!;Z!QF
Criteria criteria = ZA6)@Mn
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detachedCriteria.getExecutableCriteria(session); xv>]e <":
int totalCount = XMw*4j2E
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((Integer) criteria.setProjection(Projections.rowCount qv.s-@l8
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()).uniqueResult()).intValue(); gano>W0
criteria.setProjection d\v1R-V
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(null); U/9_:
List items = \*5${[
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criteria.setFirstResult(startIndex).setMaxResults 6_kv~`"t Z
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(pageSize).list(); `(o:;<&3
PaginationSupport ps = HGlQZwf
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new PaginationSupport(items, totalCount, pageSize, k}FmdaPI'
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startIndex); JBt2R=
return ps; 'Uu!K!
} 1j?+rs+o-
}, true); Ws*UhJY<GS
} VHqHG`}:
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public List findAllByCriteria(final +Fa!<txn
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DetachedCriteria detachedCriteria){ Yh2[
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return(List) getHibernateTemplate S^T
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().execute(new HibernateCallback(){ h1 pEC
publicObject doInHibernate &hu>yH>j
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(Session session)throws HibernateException { F_F02:t
Criteria criteria = !8*lU2
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detachedCriteria.getExecutableCriteria(session); O QGKH6q
return criteria.list(); y,s`[=CT
} h yK&)y?~
}, true); fs\A(]`$
} M`)/^S9
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public int getCountByCriteria(final ?/|KM8
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DetachedCriteria detachedCriteria){ a&RH_L jM
Integer count = (Integer) )9i$ 1"a(
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getHibernateTemplate().execute(new HibernateCallback(){ |ya.c\}q
publicObject doInHibernate O+OUcMa,
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(Session session)throws HibernateException { gE: ?C2
Criteria criteria = ^:~!@$*;6
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detachedCriteria.getExecutableCriteria(session); ]p!)8[<
return QTC!vKM
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criteria.setProjection(Projections.rowCount ,0a\Ka{^
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()).uniqueResult(); 7!Qu+R
} Z0%:j\W4c
}, true); 4i7+'F
return count.intValue(); 49.B!DqQW&
} 5Mz:$5Tm
} 1]69S(
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用户在web层构造查询条件detachedCriteria,和可选的 lHAWZyO
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 EKus0"|
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PaginationSupport的实例ps。 VwOcWKD
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ps.getItems()得到已分页好的结果集 YD;G+"n?T
ps.getIndexes()得到分页索引的数组 \@[,UZ
ps.getTotalCount()得到总结果数 BU#3fPl
ps.getStartIndex()当前分页索引 3$ wK*xK
ps.getNextIndex()下一页索引 CEW1T_1U<\
ps.getPreviousIndex()上一页索引 LXqPNVp#
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 1mD)G55Ep
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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 5th?m>
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一下代码重构了。 7=%Oev&0g-
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我把原本我的做法也提供出来供大家讨论吧: k.z(.uc=
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首先,为了实现分页查询,我封装了一个Page类: NSM7n=
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java代码: @VPmr}p:{
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/*Created on 2005-4-14*/ +Qf}&D_
package org.flyware.util.page; *YSRZvD<\
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/** /3&MUB*z&y
* @author Joa 0` .5gxm
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*/ [Q+k2J_h
publicclass Page { L7hRFf-o
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/** imply if the page has previous page */ ?}uuTNLl)
privateboolean hasPrePage; h aApw(.%
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