Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 I SZEP8w
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 n. N0Nhd
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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 ) %Xp?H_
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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 Wx/PD=Sf&
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分页支持类: uUaDesz~=
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java代码: D_F1<q
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package com.javaeye.common.util; c;b<z|}z
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import java.util.List; mtFC H
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publicclass PaginationSupport { N["M "s(N
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publicfinalstaticint PAGESIZE = 30; aAu%QRq
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privateint pageSize = PAGESIZE; 1(aib^!B
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privateList items; %MtaWZ
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privateint totalCount; $\oe}`#o
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privateint[] indexes = newint[0]; ODCN~7-@
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privateint startIndex = 0; !9C]Fs*`?
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public PaginationSupport(List items, int `sdbo](76
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totalCount){ 1- GtZ2
setPageSize(PAGESIZE); `+(JwQC4
setTotalCount(totalCount); c@O7,y:`I
setItems(items); wuqB['3
setStartIndex(0); &~)1mnv.
} a,t]> z95
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public PaginationSupport(List items, int K]U8y$^
nzi)4"3O
totalCount, int startIndex){ q>a/',m
setPageSize(PAGESIZE); "Bn]-o|r
setTotalCount(totalCount); o[G,~f\-
setItems(items); !\Q/~p'jS
setStartIndex(startIndex); Wf
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} uc;,JX!bN
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public PaginationSupport(List items, int _@]@&^K$E
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totalCount, int pageSize, int startIndex){ TSd;L
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setPageSize(pageSize); 03y5$kQ
setTotalCount(totalCount); x6~`{N1N
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setItems(items); 9fb"R"(M
setStartIndex(startIndex); @|o^]-,
} *j|BSd
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publicList getItems(){ I^y,@EHR
return items; T$xY]hqr
} R$40cW3`
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publicvoid setItems(List items){ $30lNZK1m8
this.items = items; %xI,A '#
} wkZ}o,{*:
n&uD=-
publicint getPageSize(){ c_bIadE{
return pageSize; "^@0zy@x
} ,`< [ej
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publicvoid setPageSize(int pageSize){ -J*jW
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this.pageSize = pageSize; e?~6HP^%.
} I_@XHhyVZ
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publicint getTotalCount(){ 8U>f/dxLOO
return totalCount; }<kpvd+ps=
} 9y"*H2$#
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publicvoid setTotalCount(int totalCount){ 0dgp<
if(totalCount > 0){ :X;'37o#q
this.totalCount = totalCount; vL7JzSU_
int count = totalCount / Y/_b~Ahn
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pageSize; @'EU\Y\l
if(totalCount % pageSize > 0) J0M7f]
count++; n-n{+Dl!
indexes = newint[count]; @(:M?AO9S.
for(int i = 0; i < count; i++){ xW\iME
indexes = pageSize * hqVFb.6[
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} ,9W|$2=F
}else{ .W<yiB}^
this.totalCount = 0; -&*
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} @m[r0i0J"
} +Q3i&"QB.
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publicint[] getIndexes(){ /}\EMP
return indexes; s1xl*lKX%
} /MB3w m
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publicvoid setIndexes(int[] indexes){ I|*w?i*
this.indexes = indexes; .>0j<|~
} J?~El&
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publicint getStartIndex(){ 8(euWS
return startIndex; "RH pj3 si
} B`xrdtW
6.| {l8%r
publicvoid setStartIndex(int startIndex){ w]hs1vch
if(totalCount <= 0) tk@
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this.startIndex = 0; mX9amS&B$
elseif(startIndex >= totalCount) p^~AbU'6~
this.startIndex = indexes I5l5fx
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[indexes.length - 1]; TzT(aWP"
elseif(startIndex < 0) &>zzR$#1
this.startIndex = 0; pPSmSWD?
else{ x78`dX
this.startIndex = indexes (,wIbwa
LE!xj 0
[startIndex / pageSize]; 2 5DXJb^:
} |kPjjVGF{
} ,iKL
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publicint getNextIndex(){ >YwvM=b"V
int nextIndex = getStartIndex() + 038|>l-9[
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pageSize; B|9)4f&\=R
if(nextIndex >= totalCount) nKI]f`P7
return getStartIndex(); K(
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else 1 !N+hf
return nextIndex; z>rl7&[@
} ,Jm2|WKH
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publicint getPreviousIndex(){ ZG29q>
int previousIndex = getStartIndex() - .ME>ICA
!6Sr*a*5
pageSize; @ev"{dY
if(previousIndex < 0) S{HAFrkm7
return0; (_h=|VjK(I
else 1:!_AU?
return previousIndex; ]S@zhQ
} V
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} K/xn4N_UX
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抽象业务类 *0vq+C
java代码: ''t\J^+&
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/** 4eFqD;
* Created on 2005-7-12 Db:^Omwo
*/ b|SDg%e
package com.javaeye.common.business; ltQo_k
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import java.io.Serializable; .r ,wc*SF
import java.util.List; I/2{I
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import org.hibernate.Criteria; ` nd/N#
import org.hibernate.HibernateException; ]>vC.iYp
import org.hibernate.Session; ]A?(OA
import org.hibernate.criterion.DetachedCriteria; !uZ)0R
import org.hibernate.criterion.Projections; $6[%NQp
import p!oO}gE
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org.springframework.orm.hibernate3.HibernateCallback; >Hr&F
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import |WkWZZ^
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org.springframework.orm.hibernate3.support.HibernateDaoS 2ezk<R5q+
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upport; !n`9V^`
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import com.javaeye.common.util.PaginationSupport; FhP$R}F
|
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public abstract class AbstractManager extends $~3?nib"j
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HibernateDaoSupport { wiFA3_\G
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privateboolean cacheQueries = false; :Bh7mF-1
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privateString queryCacheRegion; ?]%ZJd
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publicvoid setCacheQueries(boolean u+;iR/
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cacheQueries){ $x/VO\Z{-
this.cacheQueries = cacheQueries; H'"=C&D~
} 2^X<n{0N)
@?n~v^
publicvoid setQueryCacheRegion(String x' v-]C(@
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queryCacheRegion){ Y1wH_!%b
this.queryCacheRegion = 3,"G!0 y.
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queryCacheRegion; &c^tJ-s
} v8"Zru
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publicvoid save(finalObject entity){ P(bds
getHibernateTemplate().save(entity); WCYVon bg"
} -]Ny-[P
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publicvoid persist(finalObject entity){ en"\2+{Cg
getHibernateTemplate().save(entity); j.yh>"de
} s-4qK(ml-
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publicvoid update(finalObject entity){ y&A&d-
getHibernateTemplate().update(entity); Obx!>mI^6
} C';Dc4j
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publicvoid delete(finalObject entity){ \Ez&?yb/
getHibernateTemplate().delete(entity); qL?$u07<9'
} {Ia1Wd 8n
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publicObject load(finalClass entity, G '%ZPh89
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finalSerializable id){ !ir%Pz^)
return getHibernateTemplate().load 6"9(ce
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(entity, id); R_=fH\c;
} GBTwQYF
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publicObject get(finalClass entity, R"{P#U,HNO
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finalSerializable id){ WQ9VcCY
return getHibernateTemplate().get ,va2:V
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(entity, id); qN^]`M[ BY
} !Ld[`d.|R!
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publicList findAll(finalClass entity){ gX`C76P!
return getHibernateTemplate().find("from }((P)\s
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" + entity.getName()); RJ-J/NhWyI
} sT,*<^
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publicList findByNamedQuery(finalString ./<giTR:p
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namedQuery){ :|-^et]a8
return getHibernateTemplate i&-g
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().findByNamedQuery(namedQuery); +.v+Opp,
} 59(kk;
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publicList findByNamedQuery(finalString query, _`Dz%(c
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finalObject parameter){ 9Qq%Fw_
return getHibernateTemplate (e32oP"
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().findByNamedQuery(query, parameter); pIPjTQ?cq
} S-79uo
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publicList findByNamedQuery(finalString query, =%{E^z>1
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finalObject[] parameters){ i x_a
return getHibernateTemplate 6-\C?w
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().findByNamedQuery(query, parameters); w69G6G(
} kZQ$Iv+^(
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publicList find(finalString query){ (`d _DQ
return getHibernateTemplate().find 9abn6S(XpJ
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(query); *jl_,0g]
} OKCX>'j:S
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publicList find(finalString query, finalObject o2^?D`Jr
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parameter){ 30h1)nQ$h}
return getHibernateTemplate().find ScC!?rTW~7
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(query, parameter); 9|hPl-.
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} {N0ky=ud
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public PaginationSupport findPageByCriteria 1F?ylZ|~
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(final DetachedCriteria detachedCriteria){ jqy?Od)
return findPageByCriteria Xqas[:)7+
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); D 3}e{J8
} }{e7wqS$&,
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public PaginationSupport findPageByCriteria 0"M0tA#
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(final DetachedCriteria detachedCriteria, finalint A\<WnG>xjP
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startIndex){ 5$f*fMd;
return findPageByCriteria 7 m!e\x8
N%`Eq@5
(detachedCriteria, PaginationSupport.PAGESIZE, y8\4TjS1
>5-]Ur~
startIndex); O:G-I$F|
} <S
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public PaginationSupport findPageByCriteria ?28aEX_w
Z= P=oldH
(final DetachedCriteria detachedCriteria, finalint [KjL`
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pageSize, 6995r%
finalint startIndex){ RJZ4fl
return(PaginationSupport) oGi{d5
})}-K7v1+
getHibernateTemplate().execute(new HibernateCallback(){ \muC_9ke
publicObject doInHibernate zos#B30
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(Session session)throws HibernateException { .% EEly
Criteria criteria = 1(z+*`"WB&
j8gi/07l
detachedCriteria.getExecutableCriteria(session); k"2xyzt*
int totalCount = gRdg3qvU
Px))O&w{
((Integer) criteria.setProjection(Projections.rowCount ,, G6L{&Z
;1 02ddRV
()).uniqueResult()).intValue(); nfMQ3KP
criteria.setProjection fX2PteA0qX
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(null); YEx76
List items = yegTKoY
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criteria.setFirstResult(startIndex).setMaxResults 0oi
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(pageSize).list(); =N zA2td
PaginationSupport ps = *:}NS8hP
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new PaginationSupport(items, totalCount, pageSize, <j.bG 7
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startIndex); Dyj5a($9"{
return ps; f9g#pyH4
} _KkLH\1g$
}, true); pU*dE
} aMFUJrXo
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public List findAllByCriteria(final y$At$i>u
h*Y);mc$#
DetachedCriteria detachedCriteria){ oP".>g-.
return(List) getHibernateTemplate p_jDnb#
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().execute(new HibernateCallback(){ qF(F<$B
publicObject doInHibernate $3sS&i<
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(Session session)throws HibernateException { 2hRaYX,g
Criteria criteria = ]iuM2]
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detachedCriteria.getExecutableCriteria(session); Qc z7IA
return criteria.list(); rs3Uk.Z^'
} 9(Vq@.;Z`j
}, true); V$+xJ m
} OCF\*Sx
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public int getCountByCriteria(final :xfD>K
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DetachedCriteria detachedCriteria){ 7{:| )
Integer count = (Integer) s&p*.I]@>
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getHibernateTemplate().execute(new HibernateCallback(){ 0CxQ@~ttl
publicObject doInHibernate W 0Q-&4
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(Session session)throws HibernateException { hq/\'Z&!+P
Criteria criteria = F9ry?g=h
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detachedCriteria.getExecutableCriteria(session); :*e0Z2=
return viAvD6e
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criteria.setProjection(Projections.rowCount r+0"1\f3
rB}UFS)
()).uniqueResult();
= Ow}MX
} <oPo?r|oM|
}, true); R)t"`'6|
return count.intValue(); pK4I?=A'
} 6z"fBF
} S)z
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用户在web层构造查询条件detachedCriteria,和可选的 ji`N1e,l
/]T#@>('
startIndex,调用业务bean的相应findByCriteria方法,返回一个 R,/?p
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PaginationSupport的实例ps。 #18H
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ps.getItems()得到已分页好的结果集 WYwsTsG{_
ps.getIndexes()得到分页索引的数组 UMo=bs
ps.getTotalCount()得到总结果数 /+P
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ps.getStartIndex()当前分页索引 =XJ
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ps.getNextIndex()下一页索引 i=reJ(y-
ps.getPreviousIndex()上一页索引 ,|"tLN*m
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 j.sxyW?3
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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 /Bid:@R
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一下代码重构了。 kW4/0PD
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我把原本我的做法也提供出来供大家讨论吧: &'N{v@Oi)
ly}6zOC\
首先,为了实现分页查询,我封装了一个Page类: ['sj'3cW-
java代码: /lx\9S|
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/*Created on 2005-4-14*/ 8V;@yzIha
package org.flyware.util.page;
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/** J i :2P*
* @author Joa IwKhun
* 1<fS&)^W
*/ -f#0$Z/0
publicclass Page { 7UejK r
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/** imply if the page has previous page */ ?5Wj y
privateboolean hasPrePage; #gMMhB=
n&D<l '4
/** imply if the page has next page */ F.HD;C-;(
privateboolean hasNextPage; _~&6Kb^*
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/** the number of every page */ 2xhwi.u
privateint everyPage; sHyhR:
}Xr-xh\v
/** the total page number */ T(MS,AyD]
privateint totalPage; UZi^ &
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.<
/** the number of current page */ N#Y%+1
privateint currentPage; {^i7 3}@O
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/** the begin index of the records by the current Gi~p-OS,
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query */ ah1d0eP
privateint beginIndex; l)[\TD
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/** The default constructor */ t
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public Page(){ :'91qA%Wr
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} Y ( x_bJ
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/** construct the page by everyPage 8W#/=Xh?
* @param everyPage rL3<r
* */ OSQZ5:g|
public Page(int everyPage){ B8UtD
this.everyPage = everyPage; k"&loh
} &PVos|G
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/** The whole constructor */ &lbxmUeU
public Page(boolean hasPrePage, boolean hasNextPage, @wy|l)%
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( NWT/yBx
int everyPage, int totalPage, ig<Eyr
int currentPage, int beginIndex){ n]M1'yU
this.hasPrePage = hasPrePage; / hUuQDJ
this.hasNextPage = hasNextPage; F) w.q
this.everyPage = everyPage; !iKR~&UpAL
this.totalPage = totalPage; { 3``T o$
this.currentPage = currentPage; ]zp5 6U|xa
this.beginIndex = beginIndex; iku8T*&uc
} 89@\AjI
RjS;Ck@;
/** :}d`$2Dz
* @return |8I #`
* Returns the beginIndex. w0QN5?
*/ mv@cGdxu
publicint getBeginIndex(){ shW$V93<
return beginIndex; "zW3dKVc
} >cwyb9;!kK
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/** Zu(eYH=Q
* @param beginIndex 216+ tX5Z
* The beginIndex to set. W-wy<<~f
*/ HZMs],GX
publicvoid setBeginIndex(int beginIndex){ ZJ(/cD
this.beginIndex = beginIndex; htc& !m
} f.V;Hl,
v +-f
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/** L(!4e
* @return ]D^ dQ%{
* Returns the currentPage. 'B}pIx6k~
*/ D|I(2%aC
publicint getCurrentPage(){ A7U'>r_.
return currentPage; &{QB}r
} G)gf +)W
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/** N/)mw/?i
* @param currentPage <'A>7M~h?*
* The currentPage to set. rUfW0
*/ $;un$ko6%
publicvoid setCurrentPage(int currentPage){ 1"46OCu{
this.currentPage = currentPage; g!n1]- 1
} mY-Z$8r
*ggTTHy
/** O$x-&pW`g
* @return AIsM:sV]
* Returns the everyPage. #oMbE<//"
*/ l|`FW
publicint getEveryPage(){ hTI8hh
return everyPage; bGRI^
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} vl$! To9R"
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/** `XYT:'
* @param everyPage 7ka^y k@Q
* The everyPage to set. vZ
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*/ ,4j$kR
publicvoid setEveryPage(int everyPage){ 6A M,1
this.everyPage = everyPage; )ufHk
} Qv8#{y@U
U[d/`
/** B%6bk.
* @return Ary$,3X2
* Returns the hasNextPage. zcJ]US
*/ 1W~-C B>
publicboolean getHasNextPage(){ yWIieztp
return hasNextPage; wI>JOV7
} M)Rp+uQ
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/** V.WfP*~NJ
* @param hasNextPage CkoPno
* The hasNextPage to set.
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*/ ,<hXNN
publicvoid setHasNextPage(boolean hasNextPage){ Tp`)cdcC[
this.hasNextPage = hasNextPage; d!8q+FI
} |L;'In
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/** &Wd,l$P<O
* @return xHsH .f_{
* Returns the hasPrePage. Y@eHp-[
*/ 6?*iIA$b
publicboolean getHasPrePage(){ k6JB%m\E
return hasPrePage; md$[Bs9
} vlIdi@V
b]RCe^E1
/** \(T;@r
* @param hasPrePage >o.u,
* The hasPrePage to set. #*S/Sh?Q
*/
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publicvoid setHasPrePage(boolean hasPrePage){ Byldt
this.hasPrePage = hasPrePage; _?G\^^
} %J.Rm0FD:
w41#?VC/
/** jv2l_
* @return Returns the totalPage. eg(xN/D
* GsDSJz
*/ vJ"@#$.
publicint getTotalPage(){ t ?bq~!X
return totalPage; *qOo,e
} -HoPECe
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/** S<p
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* @param totalPage S}Mxm2
* The totalPage to set. -^#Ix;%
*/ $6y1';A
publicvoid setTotalPage(int totalPage){ iZjvO`@[
this.totalPage = totalPage; "#4PU5.
} ev8E.ehD
~ S-x-cZ
} 7ZZSAI
2YwV}
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