Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 >NKe'q<)3
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ]b= P=
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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 pFm=y#!t
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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 ;?6No(/
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分页支持类: Udc=,yo3Qm
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java代码: oXDN+4ge
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package com.javaeye.common.util; qt3PXqR7:
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import java.util.List; ,i0b)=!o
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publicclass PaginationSupport { f_imyzP
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publicfinalstaticint PAGESIZE = 30; }?@rO`:EF+
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privateint pageSize = PAGESIZE; eh ,~F
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privateList items; Hzhceeh_+
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privateint totalCount; DwV4o^J:l
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privateint[] indexes = newint[0]; 8NU`^L:1
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privateint startIndex = 0; e{A9r@p!
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public PaginationSupport(List items, int b-Z4
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totalCount){ xxm%u9@s
setPageSize(PAGESIZE); v"MX>^/<
setTotalCount(totalCount); ] )"u+
setItems(items); {w8 NN-n
setStartIndex(0); U^.4Hy&D
} LT~YFS
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public PaginationSupport(List items, int Hh4 n
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totalCount, int startIndex){ xEltwuDd?
setPageSize(PAGESIZE); A+&xMM2Wj
setTotalCount(totalCount); 2TES>}
setItems(items); &I({T`=
setStartIndex(startIndex);
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} r,]#b[:.s|
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public PaginationSupport(List items, int ~=wCwA|1
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totalCount, int pageSize, int startIndex){ rFZrYm
setPageSize(pageSize); `$YP<CJeq
setTotalCount(totalCount); jr /lk
setItems(items); $v`afd y
setStartIndex(startIndex); O Lc}_
} Ka|eFprS
jS!`2li?{
publicList getItems(){ `' 153M]
return items; s3 ;DG
} e*
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publicvoid setItems(List items){ }%-t+Tf,
this.items = items; #-"VS-.<
} @O}7XRJ_8
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publicint getPageSize(){ ]{
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return pageSize; {u\%hpD_
} ~RBrSu)
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{
publicvoid setPageSize(int pageSize){ BYM3jXWi0v
this.pageSize = pageSize; R|P_GN6>
} 3:5DL!Sm8J
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publicint getTotalCount(){ \@~UDP]7
return totalCount; (5<^p&
} ==H$zmK
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publicvoid setTotalCount(int totalCount){ #u5~0,F
if(totalCount > 0){ a1.|X i'/z
this.totalCount = totalCount; 8CC/ BOe
int count = totalCount / oW$s
xS
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pageSize; T}D<Sc
if(totalCount % pageSize > 0) t0#[#I1+
count++; 8seBT;S
indexes = newint[count]; f{lZKfrp
for(int i = 0; i < count; i++){ MDRe(rF=
indexes = pageSize * m9md|yS
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i; qUo-Dq>
} @4!x>q$3
}else{ e9^2,:wLB
this.totalCount = 0; 1P]de'-`j
} J.RAmU <
} '(#g1H3
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publicint[] getIndexes(){ v8I{XU@%
return indexes; ibdO*E
} '+*-s7o{
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publicvoid setIndexes(int[] indexes){ .1 QgK
this.indexes = indexes; 3|rn] yZ
} (vJ2z
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publicint getStartIndex(){ me\cLFw
return startIndex; fA! 6sB
} R<zG^m
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publicvoid setStartIndex(int startIndex){ !RlC~^
-
if(totalCount <= 0) M8@_Uj
this.startIndex = 0; *OdX u&5
elseif(startIndex >= totalCount) g6sjc,`
this.startIndex = indexes bQaoMZB
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[indexes.length - 1]; fj4^VXD
elseif(startIndex < 0) n~Szf
this.startIndex = 0; ACjf\4Q
else{ GIv){[i
this.startIndex = indexes K`nJVc
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[startIndex / pageSize]; HXJ9xkrr
} -U>7
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} (tl}q3U
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publicint getNextIndex(){ 0]x;n+G[q
int nextIndex = getStartIndex() + s6=YV0w(
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pageSize; j1$<] f
if(nextIndex >= totalCount) WA
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return getStartIndex(); =V|Nn0E
else EX?h0Uy
return nextIndex; ~2/{3m{3 A
} ~F#A
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OCHm;
publicint getPreviousIndex(){ wH!#aB>kP
int previousIndex = getStartIndex() - bj"z8 kP
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pageSize; &-GuKH(Y<
if(previousIndex < 0) (G4'(6
return0; $Kq<W{H3ut
else B;-2$
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return previousIndex; c6b0*!D"}
} ZM~`Gd9K0E
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} 98*x 'Wp
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抽象业务类 St>`p-
java代码: Isovwd
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/** ^t78jfl
* Created on 2005-7-12 *`KrVu 6s
*/ bV3lE6z
package com.javaeye.common.business; Yjup
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import java.io.Serializable; FD6v/Y
import java.util.List; `Lz1{#F2G
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import org.hibernate.Criteria; %yaG,;>U
import org.hibernate.HibernateException; DuF7HTN[K
import org.hibernate.Session; M^ 5e~y
import org.hibernate.criterion.DetachedCriteria; w3#`1T`N
import org.hibernate.criterion.Projections; V:\]cGA{
import 8Inx/>eOI
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org.springframework.orm.hibernate3.HibernateCallback; 5
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import KzkgWMM
g 2'x#%ET
org.springframework.orm.hibernate3.support.HibernateDaoS e~Hr(O+;e6
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upport; Lp~^*j(
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import com.javaeye.common.util.PaginationSupport; 8^w/HCC8O
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public abstract class AbstractManager extends p^8JLC
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HibernateDaoSupport { 6wpU6NU
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privateboolean cacheQueries = false; >Me]m<$E;
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privateString queryCacheRegion; >Zdi5')
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publicvoid setCacheQueries(boolean 99KVtgPm
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cacheQueries){ l<2oklo5
this.cacheQueries = cacheQueries; aFG3tuaKrQ
} & z gPN8u
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publicvoid setQueryCacheRegion(String dwp:iM
)nnCCRS6
queryCacheRegion){ L*O>IQh2
this.queryCacheRegion = XTj73 MWY
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queryCacheRegion; jvO3_Zt9
} kr{)
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publicvoid save(finalObject entity){ x(vai1CrdH
getHibernateTemplate().save(entity); tE:X,Lt[
} vpa fru4
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publicvoid persist(finalObject entity){ DoG%T(M!a9
getHibernateTemplate().save(entity); ,F}r@
}
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publicvoid update(finalObject entity){ \c68n
getHibernateTemplate().update(entity); M,JA;a, _
} &gWiu9WbS
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publicvoid delete(finalObject entity){ Oc^m_U8>^
getHibernateTemplate().delete(entity); 6oA~J]<
} 1C'P)f28
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publicObject load(finalClass entity, WQ.i$ID/
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finalSerializable id){ G)~MbesJ
return getHibernateTemplate().load :;_#5
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(entity, id); /4H[4m]I
} 6s5b$x
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publicObject get(finalClass entity, ;24'f-Eri
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finalSerializable id){ CfY7<o1>
return getHibernateTemplate().get O8$~*NFJf
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(entity, id); Nor`c+,4
} NZ)b:~a
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publicList findAll(finalClass entity){ WCoF{*
return getHibernateTemplate().find("from HNFhH0+^
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" + entity.getName()); shy
} mw Z'=H
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publicList findByNamedQuery(finalString yIa[yJq
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namedQuery){ +h|K[=l\
return getHibernateTemplate E\_W
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().findByNamedQuery(namedQuery); UE{,.s
} bk0Y
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publicList findByNamedQuery(finalString query, $^K]&Mft
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finalObject parameter){ M`bL5J;
return getHibernateTemplate L=,Y1nO:p
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().findByNamedQuery(query, parameter); \.kTe<.:_
} 9='=-;@/5
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publicList findByNamedQuery(finalString query, 2mSD"[%
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finalObject[] parameters){ #TIX_ RXh
return getHibernateTemplate 2k+=kt
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().findByNamedQuery(query, parameters); |@+8]dy:l
} [qW<D/@
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publicList find(finalString query){ N:OD0m%`)
return getHibernateTemplate().find k3C"
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(query); u\:rY)V
} @c0n2 Xcr
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publicList find(finalString query, finalObject mZ~mf->%
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parameter){ ,zG <7~m
return getHibernateTemplate().find 8znj~7}#
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(query, parameter); `(!W s\:
} O1|B3M[P
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public PaginationSupport findPageByCriteria K/Sq2:
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(final DetachedCriteria detachedCriteria){ L>0!B8X2
return findPageByCriteria kpl~/i`4
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Gee~>:_Q{J
} lD9%xCo9(
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public PaginationSupport findPageByCriteria &3WkH W
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(final DetachedCriteria detachedCriteria, finalint -g9^0V`G
ss/h[4h4h
startIndex){ O<4Q$|=&?
return findPageByCriteria 2wGF-V
n}=rj7
(detachedCriteria, PaginationSupport.PAGESIZE, 4U}zJP(L
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startIndex); fE'-.nA+
} LjSLg[ i
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public PaginationSupport findPageByCriteria ^WmGo]<B_
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(final DetachedCriteria detachedCriteria, finalint ESn6D@"
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pageSize, yI3Q |731)
finalint startIndex){ JL?Cnk$!
return(PaginationSupport) 45?*:)l:
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getHibernateTemplate().execute(new HibernateCallback(){ R:]/{b4Uq
publicObject doInHibernate gW'P`Oxw
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(Session session)throws HibernateException { ;R/k2^uF
Criteria criteria = W+8BQ-2
}Q!h ov
detachedCriteria.getExecutableCriteria(session);
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int totalCount = mfu*o0
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((Integer) criteria.setProjection(Projections.rowCount fL(':W&n-
5ze`IY
()).uniqueResult()).intValue(); P{"WlJ
criteria.setProjection 0[V&8\S~'T
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(null); .=>\Qq%
List items = "kcpA#uD|
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criteria.setFirstResult(startIndex).setMaxResults `l+ >iM
$dlnmNP+
(pageSize).list(); {9h`$e=
PaginationSupport ps = JX2mTQ
Fl B, (Cm
new PaginationSupport(items, totalCount, pageSize, a];BW)
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startIndex); u(8 _[/_B
return ps; nu;}S!J
} [u/zrpTk
}, true); kyy0&L
} QpdujtH`
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public List findAllByCriteria(final 0|.7Kz^
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DetachedCriteria detachedCriteria){ B*-ToXQQr
return(List) getHibernateTemplate J
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U(rr vNt:t
().execute(new HibernateCallback(){ l5{(z;xM
publicObject doInHibernate -@YVe:$%b
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(Session session)throws HibernateException { tn"Y9
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Criteria criteria = ATKYjhc _
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detachedCriteria.getExecutableCriteria(session); 'dmp4VT3
return criteria.list(); N90\]dFmy
} [54@i rH
}, true); IW5*9)N?
} [>b
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public int getCountByCriteria(final +CsI,Uf4*
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DetachedCriteria detachedCriteria){ c+@d'yR
Integer count = (Integer) 2>!_B\%) H
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getHibernateTemplate().execute(new HibernateCallback(){ b}ySZlmy
publicObject doInHibernate cxtLy&C
hg%@ W
(Session session)throws HibernateException { >{O[t2&
Criteria criteria = l@,); w=_P
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detachedCriteria.getExecutableCriteria(session); Z_iAn TT
return Iq4 Kgc
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criteria.setProjection(Projections.rowCount S% JNxT7'
&,W_#l{
()).uniqueResult(); 8vz_~p9%j
} r!{w93rPX
}, true); SRA|7g}7W
return count.intValue(); 4q\.I+r^
} qWRNHUd
} %00k1*$
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用户在web层构造查询条件detachedCriteria,和可选的 Eg@R[ ^T
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 @D.R0uM
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PaginationSupport的实例ps。 pr0@sri@
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ps.getItems()得到已分页好的结果集 OoAr%
ps.getIndexes()得到分页索引的数组 JVJ1Ay/be
ps.getTotalCount()得到总结果数 j33P~H~
ps.getStartIndex()当前分页索引 *=-__|t
ps.getNextIndex()下一页索引 WmT}t
ps.getPreviousIndex()上一页索引 7h9 fQ&y
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 *_4n2<W$
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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 p|bc=`TD
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一下代码重构了。 l5\B2 +}7
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我把原本我的做法也提供出来供大家讨论吧: mV:RmA
Q|j@#@O 1
首先,为了实现分页查询,我封装了一个Page类: G+#| )V
java代码: O?C-nw6kP
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/*Created on 2005-4-14*/ AiyvHt
package org.flyware.util.page; f>\bUmk(
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/** U}RS*7`
* @author Joa VgFF+Eg
* Se^/VVm
*/ !LHzY(
publicclass Page { zCBtD_@
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/** imply if the page has previous page */ C>w9
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privateboolean hasPrePage; 1K?
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/** imply if the page has next page */ AhbT/
privateboolean hasNextPage; ADLa.{
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/** the number of every page */ 9I`Mm}v@
privateint everyPage; in=k:j,U0
)}k?r5g
/** the total page number */ c{m
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privateint totalPage; gCk y(4
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/** the number of current page */ 9%3 r-U=
privateint currentPage; s%L"
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/** the begin index of the records by the current VQNYQqu`[
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query */ K\^&_#MG
privateint beginIndex; /c_kj2& ]9
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/** The default constructor */ `L"p)5H
public Page(){ ga{25q}"
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} Ry8WNVO}R
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/** construct the page by everyPage ~q8V<@?
* @param everyPage Zv1Bju*y
* */ 7'{Yz
public Page(int everyPage){ r'9=kx
this.everyPage = everyPage; Y6;0khp
} |z(Ws
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/** The whole constructor */ VeN&rjc
public Page(boolean hasPrePage, boolean hasNextPage, T4H oSei
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int everyPage, int totalPage, 7G>0,'XC
int currentPage, int beginIndex){ H4y1Hpa,
this.hasPrePage = hasPrePage; 9p[W :)P4d
this.hasNextPage = hasNextPage; (}~eD
this.everyPage = everyPage; Z0F>"Z_qn
this.totalPage = totalPage; TN |{P
this.currentPage = currentPage; l|ZzG4]+l
this.beginIndex = beginIndex; 9?}rpA`P
} &aevR^f+
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/** t5X^(@q4N
* @return CJ}@R.Zy
* Returns the beginIndex. /4"S}P>f
*/ xPfnyAo?%z
publicint getBeginIndex(){ O&?CoA?
return beginIndex; \6`%NhkM_
} +4:+qGAJ{
*(\;}JF-
/** Gh gvRR$
* @param beginIndex hBfzU\*0H
* The beginIndex to set. B
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*/ c> U{,z
publicvoid setBeginIndex(int beginIndex){ G7_"^r%c9;
this.beginIndex = beginIndex;
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} 2ucF(^
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/** *v:,rh
* @return #nc@!+
* Returns the currentPage. }*}`)rj,
*/ L>5!3b=b
publicint getCurrentPage(){ K&D}!.~/
return currentPage; e@2Vn? 5
} LHHDt<+B
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/** E!}-qbH^
* @param currentPage S!I <m&Cgc
* The currentPage to set. vU$O{|J
*/ qs
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publicvoid setCurrentPage(int currentPage){ >nIcFm
this.currentPage = currentPage; L1Cn
} ~g4rGz
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o
/** ,5<`+w#a
* @return 2GD mZl
* Returns the everyPage. F&L?J_=
*/ { Sliy'
publicint getEveryPage(){ H`6Jq?\
return everyPage; zIYr0k*%
} VU+ s7L0
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/** FvI0 J
* @param everyPage dVmAMQk.g
* The everyPage to set. E]eqvT NH
*/ %*Z2Gef?H
publicvoid setEveryPage(int everyPage){ }PIGj} F/
this.everyPage = everyPage; ;DgX"Uzm
} 9CU6o:'fW
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/** }rMpp[
* @return dI0>m:RBz
* Returns the hasNextPage. hA,rSq
*/ XFf+efh
publicboolean getHasNextPage(){ iJaNP%N
return hasNextPage; lRATrp#T
} ^SSOh#
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/** @#--dOWYR
* @param hasNextPage agxSb^ 8tF
* The hasNextPage to set. L^al1T
*/
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publicvoid setHasNextPage(boolean hasNextPage){ zS"zb
this.hasNextPage = hasNextPage; b{|/J <Fe
} >/HU'
/glnJ3
/** =|5bhwU]
* @return |3T|F3uEX
* Returns the hasPrePage. <#x%A0
*/ uuK]<h*
publicboolean getHasPrePage(){ MoR-8vnJ
return hasPrePage; _M]rH<h
} )Q
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*
/** soVZz3F
* @param hasPrePage teS0F
* The hasPrePage to set. h, 6S$,UI
*/ .'2gJ"?,
publicvoid setHasPrePage(boolean hasPrePage){ dR, NC-*
this.hasPrePage = hasPrePage; I^\bS
} bb:|1D
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/** /'=^^%&:B