Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 wO^$!zB W
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 jw/'*e
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 w8 ?Pb$Fe
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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 qZ8|B
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分页支持类: b4Ricm
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java代码: 1.Haf
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package com.javaeye.common.util; H!u nIy|
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import java.util.List; Np.no$_
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publicclass PaginationSupport { rnnX|}J
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publicfinalstaticint PAGESIZE = 30; Tg"'pO
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privateint pageSize = PAGESIZE; 6uu^A9x
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privateList items; ;\<""Yj@l
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privateint totalCount; zb"rMzCH
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privateint[] indexes = newint[0]; :d;[DYFLxb
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privateint startIndex = 0; -Nsk}Rnk*
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public PaginationSupport(List items, int KKLR'w,A>
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totalCount){ W*YxBn4
setPageSize(PAGESIZE); lemVP'cn
setTotalCount(totalCount); pTcbq
setItems(items); *-?Wcz
setStartIndex(0); 3.Ji5~
} Oq*n9V
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public PaginationSupport(List items, int xU@1!%l@
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totalCount, int startIndex){ 4cott^K.
setPageSize(PAGESIZE); J6*f Uh
setTotalCount(totalCount); q}#iV$dAj
setItems(items); |:./hdcad
setStartIndex(startIndex); IZO@V1-m
} D,c!#(v cK
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public PaginationSupport(List items, int JDkCUN 5
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totalCount, int pageSize, int startIndex){ 3Bejp+xX
setPageSize(pageSize); A/!<kp{S
setTotalCount(totalCount); ci`zR9Ks
setItems(items); ~ct2`M$TL(
setStartIndex(startIndex); 0z<H(|
} Rb)|66&3&
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publicList getItems(){ g.9L)L
return items; DH:J
} E [S?
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publicvoid setItems(List items){ ;xfO16fNk
this.items = items; 3FFaEl
} (@+h5@J[`I
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publicint getPageSize(){ OFL|RLiD
return pageSize; -^yXLa;D
} kB8
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publicvoid setPageSize(int pageSize){ 2R~6<W+&:>
this.pageSize = pageSize; ndr)3tuYu
} s8^~NX(xdy
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publicint getTotalCount(){ fO6[!M(
return totalCount; xPt*CB
} 7skljw(
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publicvoid setTotalCount(int totalCount){ ~F;CE"3A
if(totalCount > 0){ ?KCivf
this.totalCount = totalCount; {J2#eiF
int count = totalCount / D z@1rc<B
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pageSize; S`=n&'
if(totalCount % pageSize > 0) hd5$ yU5JQ
count++; IhE9snJ[
indexes = newint[count]; (VyA6a8
for(int i = 0; i < count; i++){ T'.[F
indexes = pageSize *
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} \b$<J.3
}else{ 5X0QxnnV
this.totalCount = 0; W"Z#Fs{n8
} 'G8 ?'u_)
} ,HZYG4,
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publicint[] getIndexes(){ 1fY>>*oP
return indexes; ><=rIhG%H@
} }z
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publicvoid setIndexes(int[] indexes){ _42Z={pZZq
this.indexes = indexes; F}D3,&9N
} )7dEi+v52
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publicint getStartIndex(){ (0OM"`j
return startIndex; 3V}(fnv
} 96=Z"
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publicvoid setStartIndex(int startIndex){ 3C M^j<9
if(totalCount <= 0) %G[/H.7s-
this.startIndex = 0; F;P5D<
elseif(startIndex >= totalCount) &cc9}V)M
this.startIndex = indexes mw4JQ\
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[indexes.length - 1]; P$ucL~r
elseif(startIndex < 0) O#EqG.L5
this.startIndex = 0; :H?f*aw
else{ \lEkfcc
this.startIndex = indexes zb :kanb-
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[startIndex / pageSize]; 2 z7}+lH
} qfYG.~`5
} w{`Acu
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publicint getNextIndex(){ I8u!\F
int nextIndex = getStartIndex() + 59<hV?
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pageSize; _R^y\1Qu
if(nextIndex >= totalCount) ARF\fF|<2
return getStartIndex(); 1k[GuG%/K
else 6{=_718l`
return nextIndex; vk'rA{x
} 8eJE>g1J
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publicint getPreviousIndex(){ l^W uS|G[
int previousIndex = getStartIndex() - MQ` %``
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pageSize; mI"D(bx\
if(previousIndex < 0) ` 1+%}}!$u
return0; VRbQdiZ{
else =K(JqSw+M
return previousIndex; fx)KNm8Lx
} I\zemW!
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} '#D8*OP^
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抽象业务类 9I.^LZ"
java代码: yMxTfR
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/** 68e[:wf
* Created on 2005-7-12 [T^?Q%h
*/ dJD(\a>r.u
package com.javaeye.common.business; OlY$v@|
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import java.io.Serializable; bd==+
import java.util.List; >c~RI7uu
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import org.hibernate.Criteria; xu\eX x6H
import org.hibernate.HibernateException; n]y EdL/1
import org.hibernate.Session; ashar&'
import org.hibernate.criterion.DetachedCriteria; x[i `S8D
import org.hibernate.criterion.Projections; PeTA$Yl
import kOjf #@c
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org.springframework.orm.hibernate3.HibernateCallback; ho.(v;
import a#[-*ou`
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org.springframework.orm.hibernate3.support.HibernateDaoS |=K_F3aJ
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upport; I ~$1Lu`~
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import com.javaeye.common.util.PaginationSupport; (Rd$VYuf
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public abstract class AbstractManager extends obo&1Uv,/
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HibernateDaoSupport { FTf<c0
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privateboolean cacheQueries = false; jc:s` 4
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privateString queryCacheRegion; |+}G|hx@9
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publicvoid setCacheQueries(boolean vmX"+sHz$]
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cacheQueries){ fU+Pn@'
this.cacheQueries = cacheQueries; uQ/h'v
} l]6%lud8_
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publicvoid setQueryCacheRegion(String v }\,o%t^
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queryCacheRegion){ x#H
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this.queryCacheRegion = ;\{`Ci\
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queryCacheRegion; ,S&z<S_
} rwf^,r"r
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publicvoid save(finalObject entity){ L'Q<>{;Ig
getHibernateTemplate().save(entity); #FH[hRo=6
} v=?2S
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publicvoid persist(finalObject entity){ @xAfZb2 E
getHibernateTemplate().save(entity); Z`Z5sj 4{
} -{jdn%Y7CK
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publicvoid update(finalObject entity){ Jxl6a:
getHibernateTemplate().update(entity); R 94^4I
} (u1m]WYL
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publicvoid delete(finalObject entity){ bPbb\|u0d
getHibernateTemplate().delete(entity); .uz|/Zy
} rS8 w\`_
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publicObject load(finalClass entity, O XP\R
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finalSerializable id){ mY7>(M{
return getHibernateTemplate().load CH#k(sy
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(entity, id); j2 %^qL
} z@ 35NZn
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publicObject get(finalClass entity, 2?q(cpsN
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finalSerializable id){ aM3gRp51cj
return getHibernateTemplate().get wq!iV |
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(entity, id); r(A.<`\
} TFQ!7'xk)
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publicList findAll(finalClass entity){ *#
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return getHibernateTemplate().find("from KKe8
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" + entity.getName()); C#0Qd%
} @~td`Z?1y
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publicList findByNamedQuery(finalString "2ru 7Y"
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namedQuery){ 8 .>/6M
return getHibernateTemplate yY).mxRN
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().findByNamedQuery(namedQuery); q!~ -(&S
} -e GL) M
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publicList findByNamedQuery(finalString query, 2S[-$9
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finalObject parameter){ KL,/2(
return getHibernateTemplate d~J-|yyT
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().findByNamedQuery(query, parameter); !%(h2]MQ
} #SVNHpx
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publicList findByNamedQuery(finalString query, CBYX]
)::>q5c
finalObject[] parameters){ p/Sbt/R
return getHibernateTemplate pO Iq%0]
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().findByNamedQuery(query, parameters); 6Q&r0>^{
} ^ >x|z.
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publicList find(finalString query){ inb^$v
return getHibernateTemplate().find $q?$]k|M`
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(query); R:-JkV>e:
} +yob)%
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publicList find(finalString query, finalObject @!N-RQ&A
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parameter){
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return getHibernateTemplate().find -ezY= 0Q&
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(query, parameter); f*{
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} dCe4u<so\
kv,%(en]
public PaginationSupport findPageByCriteria 0kQPJWF
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(final DetachedCriteria detachedCriteria){ >KLtY|o)
return findPageByCriteria AUVgPXOwd
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 0 S_ ':r
} GPhl4#'
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public PaginationSupport findPageByCriteria sbkQ71T:
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(final DetachedCriteria detachedCriteria, finalint @$"J|s3M
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startIndex){ NgCuFL(Ic
return findPageByCriteria u?Tpi[
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(detachedCriteria, PaginationSupport.PAGESIZE, ev0oO+u
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startIndex); W6T|iZoV"r
} "vYE+
@ l1
public PaginationSupport findPageByCriteria +x?#DH-
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(final DetachedCriteria detachedCriteria, finalint m=AqV:%|
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pageSize, (`>voi<^
finalint startIndex){ w~_;yQ
return(PaginationSupport) f'I z
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getHibernateTemplate().execute(new HibernateCallback(){ w;}@'GgL
publicObject doInHibernate [ xOzzp4
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(Session session)throws HibernateException { - K%,^6
Criteria criteria = R+q"_90_
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detachedCriteria.getExecutableCriteria(session); IKtB;
int totalCount = s]T""-He
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((Integer) criteria.setProjection(Projections.rowCount Mypc3
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()).uniqueResult()).intValue(); fP
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criteria.setProjection (>6*#9#p
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(null); Qu=LnGo~P
List items = nVu&/
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criteria.setFirstResult(startIndex).setMaxResults Q$obOEr2(
)%SkJ
(pageSize).list(); x:vu'A
PaginationSupport ps = /(.6bv
;!91^Tl
new PaginationSupport(items, totalCount, pageSize, k4qp u=@U
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startIndex); %p^.\ch9
return ps; l$K,#P<)
} AM"Nn
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}, true); 4!asT;`'
} Q6o(']0
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public List findAllByCriteria(final
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DetachedCriteria detachedCriteria){ Zh5RwQNE~
return(List) getHibernateTemplate p~ C.IG
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e
().execute(new HibernateCallback(){ =ji1S}e~p
publicObject doInHibernate lPLz@Up~
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(Session session)throws HibernateException { 2fU$J>Y
Criteria criteria = !zPG?q]3
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detachedCriteria.getExecutableCriteria(session); $M_x!f'{>
return criteria.list(); mrm^e9*Z
} >FhK#*Pa
}, true); SVjl~U-^
} |K?#$~
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public int getCountByCriteria(final D+~_TA
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DetachedCriteria detachedCriteria){ k5kdCC0FCk
Integer count = (Integer) *A}cL
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getHibernateTemplate().execute(new HibernateCallback(){ b}T6v
publicObject doInHibernate :16P.z1L
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(Session session)throws HibernateException { /8VP[i)u
Criteria criteria = :{NC-%4o0
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detachedCriteria.getExecutableCriteria(session); \%sVHt`c
return 0y<wvLv2C
7?B.0>$3>V
criteria.setProjection(Projections.rowCount V\V)<BARe
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()).uniqueResult(); kNu'AT#3|
} 9 Pw0m=4
}, true); 3] 1-M
return count.intValue(); ExHKw~y9
} 2<mW\$
} bCZ gcN
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do uc('@
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用户在web层构造查询条件detachedCriteria,和可选的 |[9?ma
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ~[k%oA%W
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PaginationSupport的实例ps。 PA6=wfc
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ps.getItems()得到已分页好的结果集 <o2r~E0r3
ps.getIndexes()得到分页索引的数组 c*d9'}E
ps.getTotalCount()得到总结果数 jL)WPq!m+
ps.getStartIndex()当前分页索引 Og;-B0,A
ps.getNextIndex()下一页索引 %3HVFhl
ps.getPreviousIndex()上一页索引 G8W#<1LE
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Ifk#/d
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 4'KOpl
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一下代码重构了。 I8OD$`~*U6
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我把原本我的做法也提供出来供大家讨论吧: 6 \B0^
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首先,为了实现分页查询,我封装了一个Page类: 8 i&_Jgmr
java代码: S'dV>m`
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/*Created on 2005-4-14*/ 6io , uh!
package org.flyware.util.page; 4`#F^2r!
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/** B7\k< Nit0
* @author Joa `P Xz
* s08u @
*/ co_oMc
publicclass Page { (BX83)
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/** imply if the page has previous page */ %hlspI(J
privateboolean hasPrePage; iAY!oZR(WT
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/** imply if the page has next page */ <lr*ZSNY
privateboolean hasNextPage; O7']
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/** the number of every page */ 79zJ\B_
privateint everyPage; 9*6]&:fm
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/** the total page number */ TEUY3z[g
privateint totalPage; M(|
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/** the number of current page */ AvR2_
privateint currentPage; TJ?g%
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/** the begin index of the records by the current h5
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query */ V+?]S
privateint beginIndex; ^"8G`B$r
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/** The default constructor */ }4co)B"
public Page(){ iq?#rb P#I
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} -6Tk<W
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/** construct the page by everyPage 33:DH}
* @param everyPage 'NZGQebK
* */ m}VM+=
public Page(int everyPage){ ,]R8(bD)
this.everyPage = everyPage; X7UBopm&
} fbZibcQ%k
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/** The whole constructor */ NGjdG=,
public Page(boolean hasPrePage, boolean hasNextPage, Bz8 &R|~>"
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int everyPage, int totalPage, $awi>#[
int currentPage, int beginIndex){ Hv#q:R8
this.hasPrePage = hasPrePage; (.K\Jg'Y6j
this.hasNextPage = hasNextPage; (k-YI{D3
this.everyPage = everyPage; ~#Md"3
this.totalPage = totalPage; @-.? B
this.currentPage = currentPage; "YFls#4H-
this.beginIndex = beginIndex; Bt^K]F\
} &!7+Yb(1
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/** h~HB0^|
* @return 5''*UFIF1
* Returns the beginIndex. >AD=31lq
*/ QHf$f@bjI
publicint getBeginIndex(){ &ju-
return beginIndex; (VHND%7P
} upn8n vy4(
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/** TZ^LA
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* @param beginIndex #,f{Ok+
* The beginIndex to set. NlR"$
*/ lhn8^hOJ/
publicvoid setBeginIndex(int beginIndex){ )jW(6
this.beginIndex = beginIndex; u7]<=*V]
} ^,s?e.u$8`
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/** &TN2 HZ-bJ
* @return wuK=6RL
* Returns the currentPage. !oSLl.fQd
*/ H9"= p
publicint getCurrentPage(){ ~2%3FV^
return currentPage; (*^DN{5
} vx 0UoKX
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/** f>iuHR*EXB
* @param currentPage =DgCC|p
* The currentPage to set. P@ypk^v
*/ ;"7/@&M\m
publicvoid setCurrentPage(int currentPage){ &{^eU5
this.currentPage = currentPage; 2RNrIU I2
} _\AUQ{
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/** b;vNq
* @return =3+L#P=i9
* Returns the everyPage. a+(j?_FyI
*/ $+VgDe5{S
publicint getEveryPage(){ `"<2)yq?
return everyPage; G\rj?%
} .P/xs4
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/** .j 'wQ+_
* @param everyPage X\A]"su
* The everyPage to set. 3ut_Bt\
*/ az(5o
publicvoid setEveryPage(int everyPage){ }brr ))
this.everyPage = everyPage; vo;5f[>4i
} g5}7y\
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/** ya>N.h
* @return gduxA/aT
* Returns the hasNextPage. m# ad6
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*/ ./iXyta
publicboolean getHasNextPage(){ 6o
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return hasNextPage; mTd<2Hy
} O)<r>vqe}
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/
/** m!!;/e?yx
* @param hasNextPage 9/46%=&