Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 $T* ##kyE9
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 "j|}-a
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 K|*Cka{
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 JmN,:bI
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分页支持类: T{=.mW^ x
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java代码: s'%KKC
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package com.javaeye.common.util; ,])@?TJb@
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import java.util.List; SPKen}g
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publicclass PaginationSupport { ;:xOW$
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publicfinalstaticint PAGESIZE = 30; mY"DYYR>
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privateint pageSize = PAGESIZE; x h[4d
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privateList items; Fs_,RXW"
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privateint totalCount; *8k`m)h26
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privateint[] indexes = newint[0]; .N~qpynY
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privateint startIndex = 0; #sit8k`GR8
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public PaginationSupport(List items, int zSta!]
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totalCount){ #u+BjuZo
setPageSize(PAGESIZE); rN#ydw:9
setTotalCount(totalCount); _DfI78`(
setItems(items); 5vIuH+0
setStartIndex(0); n0:+D
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} Zrfp4SlZZ
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public PaginationSupport(List items, int 2=tPxO')B
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totalCount, int startIndex){ ^EU&6M2
setPageSize(PAGESIZE); =!NYvwg6;o
setTotalCount(totalCount); [o&Vr\.$
setItems(items); A?Jm59{w
setStartIndex(startIndex); GEP YSp
} 'N,3]Soi
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public PaginationSupport(List items, int |E@G sw
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totalCount, int pageSize, int startIndex){ .FK'TG
setPageSize(pageSize); ><iE VrpN
setTotalCount(totalCount); UNocm0!N'
setItems(items); DoWY*2E
setStartIndex(startIndex); bTC2Ya
} xD#PM |I
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publicList getItems(){ ia|^>V>-
return items; %_+9y??
} KmV#%
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publicvoid setItems(List items){ RLY Ae
this.items = items; `9Ngax=_
} mm%w0dOb"
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publicint getPageSize(){ 9BLz
return pageSize; LXIlrZ9D5
} XboOvdt^|
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publicvoid setPageSize(int pageSize){ 18w[T=7)
this.pageSize = pageSize; Zx25H"5j
} Cq1t[a
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publicint getTotalCount(){ S6}_Z
return totalCount; S}e*~^1J
} &nn!{S^
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publicvoid setTotalCount(int totalCount){ fT._Os?i
if(totalCount > 0){ ,IuO;UV#)
this.totalCount = totalCount; &dvJg
int count = totalCount / 7=om /
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pageSize; l>"gO9j
if(totalCount % pageSize > 0) G%ycAm
count++; Ndi'b_Sh\
indexes = newint[count]; KtY~Y
for(int i = 0; i < count; i++){ _wM[U`H}s
indexes = pageSize * h0n0Dc{4
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i; wd*T"V3
} F-k1yZ?^
}else{ 8!>uC&bE8
this.totalCount = 0; u!g=>zEu
} /(n)I
} c%pW'UE&
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publicint[] getIndexes(){ K1O/>dN_\O
return indexes; 9YHSL[
} <Q\`2{
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publicvoid setIndexes(int[] indexes){ &\sg~
this.indexes = indexes; H?40yu2m5
} O,qR$#l
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publicint getStartIndex(){ *sJx0<!M}
return startIndex; i[3$Wi$
} #2yOqUO\
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publicvoid setStartIndex(int startIndex){ ygpC1nN
if(totalCount <= 0) d;lp^K
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this.startIndex = 0; tP!sOvQ:
elseif(startIndex >= totalCount) j K[VEhs
this.startIndex = indexes aSHZR
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[indexes.length - 1]; &[cL%pP
elseif(startIndex < 0) w])~m1yW
this.startIndex = 0; [$[t.m
else{ ieBW 0eMi
this.startIndex = indexes (/"T=`3t
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[startIndex / pageSize]; UMhM8m!=o
} &[*<>
} +\Q6Onqr
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publicint getNextIndex(){ od^ha
int nextIndex = getStartIndex() + jn}6yXB
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pageSize; gK)B3dH*&
if(nextIndex >= totalCount) tY# F8a&
return getStartIndex(); Qg6m
else A9l^S|r
return nextIndex;
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} <S$y=>.9
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publicint getPreviousIndex(){ 8QC:ro
int previousIndex = getStartIndex() - w5|@vB/pj
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pageSize; -m'a%aog
if(previousIndex < 0) ?U-p
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return0; w4L\@y3
else ^;@Bz~Z
return previousIndex; n+uq|sYVa
} (OG@]|-
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} mz\m^g3
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抽象业务类 A5H[g`&
java代码: !uO|T'u0a
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/** :cynZab
* Created on 2005-7-12 IL%&*B
*/ W2^eE9
package com.javaeye.common.business; A{+ZXu}
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import java.io.Serializable; #='#`5_5
import java.util.List; pu>LC6m3a
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import org.hibernate.Criteria; J7cqn j
import org.hibernate.HibernateException; Yhsb$wu
import org.hibernate.Session; }+=@Ci
import org.hibernate.criterion.DetachedCriteria; xq~=T:>/A
import org.hibernate.criterion.Projections; IB;y8e,
import hcf>J6ZLT
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org.springframework.orm.hibernate3.HibernateCallback; `7
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import wy-!1wd
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org.springframework.orm.hibernate3.support.HibernateDaoS wK\SeX
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upport; 5cE[s<=
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import com.javaeye.common.util.PaginationSupport; /?6y2 t
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public abstract class AbstractManager extends V&}Z# 9Dx
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HibernateDaoSupport { 3<`h/`ku
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privateboolean cacheQueries = false; DHJnz>bE
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privateString queryCacheRegion; 4@W.{|2~
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publicvoid setCacheQueries(boolean \Fe5<G'v
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cacheQueries){ ^al
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this.cacheQueries = cacheQueries; >C&!#
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} .-34g5
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publicvoid setQueryCacheRegion(String 'V>+G>U
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queryCacheRegion){ 2'}2r ~6
this.queryCacheRegion = hs*:!&E
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queryCacheRegion; < 1r.p<s
} LaIif_fie^
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publicvoid save(finalObject entity){ SMy&K[hJ[
getHibernateTemplate().save(entity); LpiLk| 2i
} d)AkA\neWo
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publicvoid persist(finalObject entity){ 7yj2we
getHibernateTemplate().save(entity); G^OSXf5
} =1JRu[&]8
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publicvoid update(finalObject entity){ |JDJ{;o
getHibernateTemplate().update(entity); r\1*N.O3|O
} TDseWdA
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publicvoid delete(finalObject entity){ j>:T)zhyY
getHibernateTemplate().delete(entity); @]7\.>)
} ynd}w
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publicObject load(finalClass entity, @Uu\x~3y
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finalSerializable id){ ZN1p>+oY!
return getHibernateTemplate().load }B.C#Y$@
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(entity, id);
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} 0jS/U|0
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publicObject get(finalClass entity, 7/yd@#$X
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finalSerializable id){ #}Cwn$
return getHibernateTemplate().get YsDl2P
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(entity, id); /6fPC;l
} )}aF=%
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publicList findAll(finalClass entity){ tv{.iM|V c
return getHibernateTemplate().find("from
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" + entity.getName()); 7l p VK]
} u rOG Oa$
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publicList findByNamedQuery(finalString a]k&$
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namedQuery){
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return getHibernateTemplate Rb0{t[IU
tvUvd(8w
().findByNamedQuery(namedQuery); }X?*o`sW
} WWLVy(
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publicList findByNamedQuery(finalString query, d7P @_jO6
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finalObject parameter){ KWUz]>Z
return getHibernateTemplate 0_EF7`T
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().findByNamedQuery(query, parameter); ^m=%Ctu#
} P(;c`
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publicList findByNamedQuery(finalString query, X3nhqQTZ
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finalObject[] parameters){ O /&%`&2
return getHibernateTemplate $5IrM7i
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().findByNamedQuery(query, parameters); 75HL
} .g~@e_;):
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publicList find(finalString query){ o~K 2K5I
return getHibernateTemplate().find -(.7/G'Vk>
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(query); QFPx4F7(e
} 8hfh,v5(
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publicList find(finalString query, finalObject WdAGZUp
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parameter){ u^9c`
return getHibernateTemplate().find w!RH*S
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(query, parameter); "BRE0Ir:
} ,LZ:y1z'V-
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public PaginationSupport findPageByCriteria uH[0kh
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(final DetachedCriteria detachedCriteria){ mW-W7-JhO7
return findPageByCriteria clw91yrQn
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 02[II_< 1
} JWL J<z
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public PaginationSupport findPageByCriteria Jf$wBPg
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(final DetachedCriteria detachedCriteria, finalint ea0tx3'
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startIndex){ >G2-kL_
return findPageByCriteria D3xaR
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(detachedCriteria, PaginationSupport.PAGESIZE, u2]g1XjeG
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startIndex); 63S1ed[
} RH Vv}N0
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public PaginationSupport findPageByCriteria F* }Q^%
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(final DetachedCriteria detachedCriteria, finalint 5-HJ&Q
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pageSize, 2hJ3m+N^
finalint startIndex){ , ~xU>L^
return(PaginationSupport) ssITe.,ny
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getHibernateTemplate().execute(new HibernateCallback(){ g{hA,-3
publicObject doInHibernate Rk%M~ D*-
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(Session session)throws HibernateException { G3+a+=e
Criteria criteria = D~Ohw sL4
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detachedCriteria.getExecutableCriteria(session); *hs<Ez.cC
int totalCount = p0y?GNQ
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((Integer) criteria.setProjection(Projections.rowCount p,\bez
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()).uniqueResult()).intValue(); j#P4Le[t
criteria.setProjection K=TW}ZO
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(null); O^weUpe\
List items = YO$b#
@ ^cgq3H'
criteria.setFirstResult(startIndex).setMaxResults Xl6ZV,1=n7
0DIM]PS
(pageSize).list(); IQ=|Kj9h
PaginationSupport ps = ,7jiHF
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new PaginationSupport(items, totalCount, pageSize, Y0O<]2yVx
8;\tP29
startIndex); {mnSTL`
return ps; <S@mQJS!y
} vC<kpf!
}, true); ]#q7}Sd
} )^S^s>3
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public List findAllByCriteria(final :YXQ9/iRr
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DetachedCriteria detachedCriteria){ ioa_AG6B
return(List) getHibernateTemplate <VR&=YJ
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().execute(new HibernateCallback(){ dzNaow*0&V
publicObject doInHibernate PB<Sc>{U
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(Session session)throws HibernateException { soQzIx
Criteria criteria = n;^k
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detachedCriteria.getExecutableCriteria(session); :$Q]U2$mPS
return criteria.list(); OGi4m |
} :'rZZeb'
}, true); bA^:p3
} t>GLZzO
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public int getCountByCriteria(final H&=4y) /.
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DetachedCriteria detachedCriteria){ < Gy!i/
Integer count = (Integer) 4i\aW:_'i
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getHibernateTemplate().execute(new HibernateCallback(){ h8= MVh(I
publicObject doInHibernate K[a<
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(Session session)throws HibernateException { xiOrk
Criteria criteria = qMdtJ(gq
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detachedCriteria.getExecutableCriteria(session); X.AWs=:-
return 'j<:FUDJ
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criteria.setProjection(Projections.rowCount Ta\8>\6
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()).uniqueResult(); grfdvN
} VDu
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}, true); aU]O$Pg{
return count.intValue(); Z=Y_;dS9
} q,,>:]f#
} $s(4?^GP
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用户在web层构造查询条件detachedCriteria,和可选的 sa gBmA~
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ic{.#R.BY
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PaginationSupport的实例ps。 ZJI1NCBZ
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ps.getItems()得到已分页好的结果集 JU=\]E@8c
ps.getIndexes()得到分页索引的数组 C(1A8
ps.getTotalCount()得到总结果数 >?{iv1
ps.getStartIndex()当前分页索引 N7HbOLpM
ps.getNextIndex()下一页索引 6[3Ioh
ps.getPreviousIndex()上一页索引 OxHw1k
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 >]XaUQ-
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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 cH* /zNp
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一下代码重构了。 p`<e~[]a
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我把原本我的做法也提供出来供大家讨论吧: !Nxn[^[?.
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首先,为了实现分页查询,我封装了一个Page类: =y-!k)t
java代码: ?Str*XA;
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/*Created on 2005-4-14*/ Ubw!/|mi
package org.flyware.util.page; :af;yu
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/** hNq8
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* @author Joa 5Ckk5b
* leb^,1/D6
*/ M8",t{7
publicclass Page { 8NAWA3^B
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/** imply if the page has previous page */ X.T\=dm%v
privateboolean hasPrePage; X~)V )'R
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/** imply if the page has next page */ x(3
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privateboolean hasNextPage; x,w`OMQ}c
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/** the number of every page */ gM;)
privateint everyPage; Q&.IlVB[
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/** the total page number */ B=Zukg1G
privateint totalPage; hV>4D&<
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/** the number of current page */ cpF1Xp vT
privateint currentPage; )S wG+k,
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/** the begin index of the records by the current uku}Mr"p
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query */ WK_y1(v>
privateint beginIndex; Oj4u!SY\j
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/** The default constructor */ _,Rsl$Tk'
public Page(){ ,yM}]pwlB
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} fZw9zqg
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/** construct the page by everyPage MKVfy:g%So
* @param everyPage )4'x7Qg/
* */ Q2[prrk%j
public Page(int everyPage){ Hlt8al3
this.everyPage = everyPage; 4(Cd
} zU4V^N'
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/** The whole constructor */ 'Ffy8z{&3
public Page(boolean hasPrePage, boolean hasNextPage, OZ>)sL
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int everyPage, int totalPage, nI` f_sp
int currentPage, int beginIndex){ wZo.ynXT
this.hasPrePage = hasPrePage; ~<2 IIR$H
this.hasNextPage = hasNextPage; hr_9;,EPh
this.everyPage = everyPage; ^8';8+$
this.totalPage = totalPage; $IxU6=ajn
this.currentPage = currentPage; #90[PASx
this.beginIndex = beginIndex; mX<Fuu}E*Z
} AK@`'$
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/** jSwtf
* @return 5q(]1|Sei
* Returns the beginIndex. |P,zGy
*/ !^)wPmk
publicint getBeginIndex(){ `?zg3GD_
return beginIndex; o[bE
} sFQ4O- SM
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/** +{")E)
* @param beginIndex <fC@KY>#
* The beginIndex to set. S'
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*/ @)W(q5)}9"
publicvoid setBeginIndex(int beginIndex){ .pS&0gBo\
this.beginIndex = beginIndex; PcHSm/d0e
} jb|mip@`
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/** e-CNQnO~
* @return X$7Oo^1;
* Returns the currentPage. h&=O-5
*/ A9\]3 LY
publicint getCurrentPage(){ 7SgweZ}"
return currentPage; b 0LGH.
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} ibd$%;bX3
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/** GI2eJK
* @param currentPage "3{#d9Gs
* The currentPage to set. m,W) N9 M
*/ >lD;0EN
publicvoid setCurrentPage(int currentPage){ (O)\#%,@R
this.currentPage = currentPage; Q00R<hu@F
} uipq=Yp.
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/** csH2_+uG
* @return <Rcu%&;i
* Returns the everyPage. !dU9sB2
*/
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publicint getEveryPage(){ O1GDugZ
return everyPage; '|vD/Qf=&
} Tub1Sv>J
o! aLZ3#X
/** [##`Um
* @param everyPage 403[oOj
* The everyPage to set. ~bdv_|k
*/ 0HGl f
publicvoid setEveryPage(int everyPage){ [8>z#*B
this.everyPage = everyPage;
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} :83,[;GO2
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/** ?e
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* @return )v[XmJ>H~o
* Returns the hasNextPage. 8F#osN
*/ 63W{U/*aao
publicboolean getHasNextPage(){ IByf_E;r
return hasNextPage; _fcS>/<a
} "j{i,&Y$_
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/** *IC^IC:
* @param hasNextPage A_!QrM
* The hasNextPage to set. ')B =|T)
*/ >T<6fpXuk2
publicvoid setHasNextPage(boolean hasNextPage){ \|CPR6I
this.hasNextPage = hasNextPage; 10p8|9rE}B
} yn SBVb!)
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/** rwiw
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* @return `E@kFJ(<On
* Returns the hasPrePage. 3Jk[/.h
*/ H&M1>JtE
publicboolean getHasPrePage(){ |xn#\epy@
return hasPrePage; b"I~_CL|
} LO)GTyzvJ
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/** ]eE 1n2
* @param hasPrePage ]kx-,M(
* The hasPrePage to set. P0^c?s"I
*/ 8{dEpV*
publicvoid setHasPrePage(boolean hasPrePage){ /Rj#sxtdw
this.hasPrePage = hasPrePage; }g~g50ci
} Kx~$Bor_!
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/** ; e@gO
* @return Returns the totalPage. ipobr7G.SD
* "e 1wr
*/ /
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publicint getTotalPage(){ e@E17l-
return totalPage; dL-i)F
} 6^)rv-L~5y
5F2_xH$5
/** *ZaaO^!
* @param totalPage GcT;e5D
* The totalPage to set. SxJ$b
*/ l3.
publicvoid setTotalPage(int totalPage){ iv*V#J>
this.totalPage = totalPage; .}q]`<]ze
} ow$q7uf
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} F$Hx`hoy
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 8'A72*dhX
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个PageUtil,负责对Page对象进行构造: q/NY72tj0
java代码: #EDEYEW7
9Hd;353Q
!;S"&mcPDJ
/*Created on 2005-4-14*/
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package org.flyware.util.page; R_^/,^1
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import org.apache.commons.logging.Log; _T5)n=|
import org.apache.commons.logging.LogFactory; rEdY>\'
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/** (luKn&826
* @author Joa w&Y{1r F>
* .63=(o
*/ E V2 )
publicclass PageUtil { @5.e@]>ZM
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privatestaticfinal Log logger = LogFactory.getLog X8i(~
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(PageUtil.class); YuQ~AE'i
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