Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 =}o>_+"
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根
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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 \6
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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 s3RyLT
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分页支持类: Wjk;"_"gd
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java代码: 1? hd
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package com.javaeye.common.util; -&$%m)wN
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import java.util.List; K?m:.ZM
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publicclass PaginationSupport { |.8=gS5
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publicfinalstaticint PAGESIZE = 30; |]3);^0
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privateint pageSize = PAGESIZE; j/IZm)\
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privateList items; >f05+%^[
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privateint totalCount; `i^1U O
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privateint[] indexes = newint[0]; \$|UFx
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privateint startIndex = 0; C$;s+ALy[
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public PaginationSupport(List items, int s H[34gCh;
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totalCount){ LZ]pyoi
setPageSize(PAGESIZE); )_.H #|r
setTotalCount(totalCount); ?6]ZQ\,
setItems(items); HON[{Oq
setStartIndex(0); hs uJ;4}$q
} z2zp c^i
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public PaginationSupport(List items, int w%H#>k
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totalCount, int startIndex){ J(VZa_
setPageSize(PAGESIZE); S60`'!y
setTotalCount(totalCount); 4/vQ=t
setItems(items); raZRa*C;
setStartIndex(startIndex); bFXCaD!{G
} },ZL8l{
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public PaginationSupport(List items, int (_<n0
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totalCount, int pageSize, int startIndex){ `<Nc
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setPageSize(pageSize); >R-$JrU.=
setTotalCount(totalCount); hlEvL
setItems(items); []^>QsS(X
setStartIndex(startIndex); Q{kuB+s
} ']Y:gmM"
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publicList getItems(){ xB[#
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return items; @L7rE)AU.
} QKQy)g
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publicvoid setItems(List items){ 3Mt6iZW
this.items = items; oLRio.u*
} 2O>iAzc
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publicint getPageSize(){ .YbD.{]D
return pageSize; >cLZP#^\2E
} v4^VYi,.-
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publicvoid setPageSize(int pageSize){ dksnW!
this.pageSize = pageSize; 2x
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} }wKU=Vm
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publicint getTotalCount(){ xRmB?kM3]5
return totalCount; vzPrG%Uu7g
} %/p5C
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.
publicvoid setTotalCount(int totalCount){ yR-.OF,c
if(totalCount > 0){ I(|{/{P,
this.totalCount = totalCount; (>'d`^kjk
int count = totalCount /
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pageSize; PeZ=ONY5
if(totalCount % pageSize > 0) >EG;2]M&
count++; b9Nw98`
indexes = newint[count]; |/ Z4lcI
for(int i = 0; i < count; i++){ lU3wIB
indexes = pageSize * n$9!G
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i; IAQ=d4V&
} 1l{n`gR
}else{ 54-x 14")
this.totalCount = 0; 8cl!8gfv
} -lHJ\=
} /V~(!S>
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publicint[] getIndexes(){ Z]dc%>
return indexes; F);C?SW"
} 9dAsXEWh
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publicvoid setIndexes(int[] indexes){ Q{l;8MCL
this.indexes = indexes; AkF3F^
} JT<J[Qz5
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publicint getStartIndex(){ ! JN@4
return startIndex; G(L*8U<UG
} #&^+hx|
pc #^{-
publicvoid setStartIndex(int startIndex){ <qu\q \
if(totalCount <= 0) Sq,x@
this.startIndex = 0; 6%>0g^`)9Y
elseif(startIndex >= totalCount) ]pb3
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this.startIndex = indexes K)n( U9#
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[indexes.length - 1]; yTk9+ >
elseif(startIndex < 0) iV%%VR8b
this.startIndex = 0; D6D*RTi4
else{ GIp?}tM
this.startIndex = indexes y]k`}&-~
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[startIndex / pageSize]; p^2pv{by
} qsLsyi |zG
} WH!<Z=#c}
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publicint getNextIndex(){ h<uQ~CQg
int nextIndex = getStartIndex() + R!`#pklB
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pageSize; .Xr_BJ _
if(nextIndex >= totalCount) {\k9%2V*+
return getStartIndex(); Mc.KLz&,FC
else ~"(1~7_
return nextIndex; `g #\ Ws
} E:7vm@+
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publicint getPreviousIndex(){
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int previousIndex = getStartIndex() - E-RbFTVBA
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pageSize; #ws6z`mt
if(previousIndex < 0) REa%kU
return0; 79&Mc,69
else YO=;)RA
return previousIndex; SU*P@?:/}
} nC z[#t
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} 4;_.|!LN
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抽象业务类 f+d{^-
java代码: >$}nKPC,Y
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/** ;$Wa=wHb
* Created on 2005-7-12 pt=[XhxC(>
*/ j,Mp["X&
package com.javaeye.common.business; 7IHWj<
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import java.io.Serializable; vWow^g
import java.util.List; MjHeUf
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import org.hibernate.Criteria; :D&QGw(n
import org.hibernate.HibernateException; ^ K/B[8
import org.hibernate.Session; }(gXlF
import org.hibernate.criterion.DetachedCriteria; UF}fmDi
import org.hibernate.criterion.Projections; &98qAO]Z
import F
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,2u]rLxx;
org.springframework.orm.hibernate3.HibernateCallback; y:1?~R
import qoOHWh&
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org.springframework.orm.hibernate3.support.HibernateDaoS b\}`L"
"|f ;
upport; m|p}Jf!
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import com.javaeye.common.util.PaginationSupport; Q&wBX%@^L
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public abstract class AbstractManager extends 7/Ew(X8Fs
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HibernateDaoSupport { ofS9h*wrJ
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privateboolean cacheQueries = false; m^p
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privateString queryCacheRegion; >5 Ce/P'R
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publicvoid setCacheQueries(boolean S&|$F2M
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cacheQueries){ #E>f.:)
this.cacheQueries = cacheQueries; |i1z47jN6P
} UUX
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publicvoid setQueryCacheRegion(String Rb#?c+&#
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queryCacheRegion){ V$@@!q
this.queryCacheRegion = w
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queryCacheRegion; ci,o'`Q
} W.>yIA%
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publicvoid save(finalObject entity){ 6?2/b`k
getHibernateTemplate().save(entity); UGl}=hwKkG
} E|#'u^`yv
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publicvoid persist(finalObject entity){ K&Zdk (l)
getHibernateTemplate().save(entity); mh|M O(
} H,] D}r
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publicvoid update(finalObject entity){ Zuwd(q
getHibernateTemplate().update(entity); BC&Et62*
} g~N)~]0{
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publicvoid delete(finalObject entity){ U edh4qa
getHibernateTemplate().delete(entity); D,]m7yFT
} &AA u:
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publicObject load(finalClass entity, Ro?yCy:L'
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finalSerializable id){ =yk#z84<
return getHibernateTemplate().load tWD*uAb
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(entity, id); >pz/wTOi
} -K+gr sb
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publicObject get(finalClass entity, 61CNEzQ
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finalSerializable id){ nbhx2@Teqe
return getHibernateTemplate().get .3oFSc`q
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(entity, id); &9IMZAo
} BYP,}yzA
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publicList findAll(finalClass entity){ 1 BVivEG
return getHibernateTemplate().find("from fH}`
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" + entity.getName()); .b5B7x}
} d7P|
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publicList findByNamedQuery(finalString [96|xe\s
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namedQuery){ K@%. T#
return getHibernateTemplate 6<FJ`l]U9
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().findByNamedQuery(namedQuery); DS-Kot(k(z
} <"aPoGda
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publicList findByNamedQuery(finalString query, [G4#DP\t>p
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finalObject parameter){ t~gnai
return getHibernateTemplate qky{]qNW
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().findByNamedQuery(query, parameter); ^P(HX
} {H"xC~.
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publicList findByNamedQuery(finalString query, J1&G1\G|s=
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finalObject[] parameters){ c7'I'~
return getHibernateTemplate q48V|6X'q
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().findByNamedQuery(query, parameters); 7_n@iUG2n
} M {_`X
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publicList find(finalString query){ MZ6?s(mkx
return getHibernateTemplate().find '9H]SEw
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(query); `fc2vaSH =
} T<?JL.8 g_
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publicList find(finalString query, finalObject *}A J7]
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parameter){ WZ;f3
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return getHibernateTemplate().find .u)Po;e`
pgfI1`h
(query, parameter); tb^3-ZUb
} mp%i(Y"vp
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public PaginationSupport findPageByCriteria <JDkvpckx.
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(final DetachedCriteria detachedCriteria){ |Zncr9b
return findPageByCriteria p7Gs
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); IgQW 5E#
} !$f@j6.
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public PaginationSupport findPageByCriteria ES<"YF
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(final DetachedCriteria detachedCriteria, finalint #*1\h=bzmW
i{
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startIndex){ qGr(MDLc
return findPageByCriteria KKl8tI\u~
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(detachedCriteria, PaginationSupport.PAGESIZE, fLxFF
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startIndex); Z,_yE*q
} N:Q}Lil
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public PaginationSupport findPageByCriteria bxK1v7
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(final DetachedCriteria detachedCriteria, finalint }`\+_@w
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pageSize, owJPEx
finalint startIndex){ }I9\=jT
return(PaginationSupport) $+R0RqV$V~
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getHibernateTemplate().execute(new HibernateCallback(){ iw12x:
publicObject doInHibernate a<rk'4,8a
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(Session session)throws HibernateException { iKs/8n
Criteria criteria = Pv+[N{
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detachedCriteria.getExecutableCriteria(session); q_ykB8Ensa
int totalCount = Y_xPr%%A
q;InFV3rv
((Integer) criteria.setProjection(Projections.rowCount wBA[L}
vn KKK. E
()).uniqueResult()).intValue();
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criteria.setProjection tHJ#2X#Y.
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(null); 2~K.m@U}!Z
List items = K9;pX2^z9
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criteria.setFirstResult(startIndex).setMaxResults =pF 6
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(pageSize).list(); a)`b;]+9
PaginationSupport ps = 0' @^PzX
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new PaginationSupport(items, totalCount, pageSize, ix=HLF-0zC
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startIndex); >s1'I:8
return ps; bN8GRK )
} kViX FPW
}, true); CZS{^6Ye
} Q!(C$&f
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public List findAllByCriteria(final "nf.kj:>
kz@@/DD/9
DetachedCriteria detachedCriteria){ o2He}t2o
return(List) getHibernateTemplate EdhT;!
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().execute(new HibernateCallback(){ tT ~}lW)Y
publicObject doInHibernate [kDjht|$>
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(Session session)throws HibernateException { %J!+f-:=
Criteria criteria = f.!)O@HzH
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detachedCriteria.getExecutableCriteria(session); ?PO~$dUc]
return criteria.list(); D ?1$I0 =
} ?J<Y]
}, true); loZJV M
} &~29 %Ns
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public int getCountByCriteria(final %`t;5kmR
z)='MKrEt-
DetachedCriteria detachedCriteria){ uHkL$}C
Integer count = (Integer) ;H9d.D8
+ G#qS1
getHibernateTemplate().execute(new HibernateCallback(){ h3$.`
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publicObject doInHibernate =toqEm~
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(Session session)throws HibernateException { yQ?N*'}$
Criteria criteria = {s6;6>-kPW
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detachedCriteria.getExecutableCriteria(session); *Em 9R
return :vz_f$=
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criteria.setProjection(Projections.rowCount _Pjo9z
9
j(HC^\Hi
()).uniqueResult(); 3@kiUbq7Eu
} "Sz pFw
}, true); wXIsc;
return count.intValue(); 9->E$W
} WX&Man!f
} @C{IgV
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用户在web层构造查询条件detachedCriteria,和可选的 {y0#(8-&
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 }2:/&H'
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PaginationSupport的实例ps。 &2C6q04b
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ps.getItems()得到已分页好的结果集 OiH
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ps.getIndexes()得到分页索引的数组 C2NJrg4(
ps.getTotalCount()得到总结果数 9oKRnc
ps.getStartIndex()当前分页索引 -e_IDE
ps.getNextIndex()下一页索引 )F4H'
ps.getPreviousIndex()上一页索引 4:RL[;
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ":E
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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 nQ2V
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一下代码重构了。 4^vEMq8lB
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我把原本我的做法也提供出来供大家讨论吧: Nv}'"V>
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首先,为了实现分页查询,我封装了一个Page类: 5m{!Rrb
java代码: vJ9Uw
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/*Created on 2005-4-14*/ u&Ts'j
package org.flyware.util.page; |fnP@k
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/** 3;(;'5|Z
* @author Joa :#W40rUb
* \o3)\
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*/ Qz/o-W;
publicclass Page { S\=j; Uem
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/** imply if the page has previous page */ 7.)e4
privateboolean hasPrePage; !dQG 5v
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/** imply if the page has next page */ cr Hd$~q,
privateboolean hasNextPage; o&}!bq]
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/** the number of every page */ U,
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privateint everyPage; 1sx@Nvlb
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/** the total page number */ LdxrS5
privateint totalPage; `F5iZWW1
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/** the number of current page */ J%`-K"NB
privateint currentPage; u:#+R_0#97
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/** the begin index of the records by the current pJ35M
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query */ h{xC0NC)
privateint beginIndex; ParOWs~W/
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/** The default constructor */ fa7Z=:aG
public Page(){ 'L|& qy@
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} QCB2&lN\&L
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/** construct the page by everyPage |"h# Q[3
* @param everyPage 0G`_dMN
* */ Y"~Tf{8
public Page(int everyPage){ j9"uxw@
this.everyPage = everyPage; KW.*LoO
} v5STe`
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/** The whole constructor */ .?{rd3[ec
public Page(boolean hasPrePage, boolean hasNextPage, lnuf_;0
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int everyPage, int totalPage, V5w00s5?%
int currentPage, int beginIndex){ tGHZU^B:}
this.hasPrePage = hasPrePage; `x%v&>
this.hasNextPage = hasNextPage; jo 0
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this.everyPage = everyPage; )p*I(y
this.totalPage = totalPage; VN!`@Ci/
this.currentPage = currentPage; S+(TRIjk
this.beginIndex = beginIndex; #'5|$ug[
} umPd+5i
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/** O[ tD7!1
* @return htC~BK3(
* Returns the beginIndex. ^Ud1 ag!-
*/ \a\-hm
publicint getBeginIndex(){ 0/{$5gy&
return beginIndex; .B2?%2S
} Q72}V9I9
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/** +M4X
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* @param beginIndex thG;~W
* The beginIndex to set. XaT9`L<
*/ )~/;Xl#b-
publicvoid setBeginIndex(int beginIndex){ 0>@D{_}s
this.beginIndex = beginIndex; V1y"
} w`_cmI
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/** P$LHsg]
* @return o,o,(sII
* Returns the currentPage. 9G njJ
*/ hP1}Do
publicint getCurrentPage(){ 8!8 yA
return currentPage; )1 ]P4
} 4n6EkTa
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/** -L%J,f[&,
* @param currentPage /.PjHTM<
* The currentPage to set. Vl=!^T}l+
*/ b4NUx)%ln
publicvoid setCurrentPage(int currentPage){ b(^g v
this.currentPage = currentPage; `PML4P[
} -+vA9,pI
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/** B~S"1EE[
* @return _X
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* Returns the everyPage. Td!@i[6%H
*/ 8MUY
publicint getEveryPage(){ +um
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return everyPage; L~x
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} pkWJb!
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/** 5]C}044
* @param everyPage T NwBnMe
* The everyPage to set. jUny&Alj
*/ &T7|f!y
publicvoid setEveryPage(int everyPage){ =Xwr*FTr
this.everyPage = everyPage; DH7B4P
} b*C\0D
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/** e,j2#wjor
* @return 5R^e
* Returns the hasNextPage. | %E\?-TK
*/ : ?K}.Kb
publicboolean getHasNextPage(){ )=,%iL-
return hasNextPage;
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} Kob i!
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/** w8MQA!=l
* @param hasNextPage -TIrbYS`
* The hasNextPage to set. lqD.epm
*/
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publicvoid setHasNextPage(boolean hasNextPage){ f~U~f}Uw4
this.hasNextPage = hasNextPage; AH*{Bi[vX
} l,z#
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/** z^@.b
* @return IZr~h9
* Returns the hasPrePage. [V vTR#^
*/ 7d9kr?3(U
publicboolean getHasPrePage(){ >F@qFPN]
return hasPrePage; 4 h}03 oG
} W6N3u7mrb
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/** aQ@9(j>
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* @param hasPrePage Pv mmyF
* The hasPrePage to set. }b$?t7Q)
*/ e_eNtVq
publicvoid setHasPrePage(boolean hasPrePage){ {_#~&I