Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 +JejnG0
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 G'T:l("l
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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 @5j3[e
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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 8B;HMD
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分页支持类: Ja{[T
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java代码: -5GRit1q?
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package com.javaeye.common.util; jd+U+8r
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import java.util.List; -op(26:W<
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publicclass PaginationSupport { %<h+_(\h
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publicfinalstaticint PAGESIZE = 30; V%JG :'6L
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privateint pageSize = PAGESIZE; :\KJw
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privateList items; N _|tw
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privateint totalCount; kB=\a(
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privateint[] indexes = newint[0]; nZ/pi$7
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privateint startIndex = 0; Mb'Tx
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public PaginationSupport(List items, int @WICAC=
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totalCount){ G'(8/os{
setPageSize(PAGESIZE); HBcL1wfS
setTotalCount(totalCount); ~ ":}Rs
setItems(items); fu{.Ir
setStartIndex(0); ~c${?uf
} {J]x81}*;
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public PaginationSupport(List items, int M1J77LfS8
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totalCount, int startIndex){ .y>G/8_i
setPageSize(PAGESIZE); o$k9$H>Na
setTotalCount(totalCount); u9D#5NvGs
setItems(items); >_SqM! ^v
setStartIndex(startIndex); vu`,:/|h
} siD/`T&
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public PaginationSupport(List items, int |%12Vr]J
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totalCount, int pageSize, int startIndex){ XG01g3
setPageSize(pageSize); %OAvhutS
setTotalCount(totalCount); >%c7|\q[ R
setItems(items); %>EM ^Z
setStartIndex(startIndex); [)t1"
} y28 e=i
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publicList getItems(){ !+T29QYK8
return items; OpFm:j3
} B-W8Zq#4>
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publicvoid setItems(List items){ !uSG 1j"y
this.items = items; WO{ET
} evGUl~</~
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publicint getPageSize(){ l1eF&wNC
return pageSize; S94S[j0D
}
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publicvoid setPageSize(int pageSize){ W \XLf,_+
this.pageSize = pageSize; eWWfUNBSLX
} o((!3H{D
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publicint getTotalCount(){ dQJ)0!B
return totalCount; `!@d$*:'
} r0,XR
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publicvoid setTotalCount(int totalCount){ BMYvxSsm
if(totalCount > 0){ kR65{h"gZT
this.totalCount = totalCount; :4/37R(~l8
int count = totalCount /
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pageSize; E@_]L<Z
if(totalCount % pageSize > 0) `]j:''K
count++; ~ ^*;#[<
indexes = newint[count]; nj6|WJ
for(int i = 0; i < count; i++){ 2JL\1=k;
indexes = pageSize * .dKFQH iYJ
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} Q|(G -
}else{ m#`1.5%
this.totalCount = 0; x@? YS
} =H;F{J"
} ^!rAT1(/_
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publicint[] getIndexes(){ R?iC"s!
return indexes; jW;g{5X
} <3!Q Xc
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publicvoid setIndexes(int[] indexes){ 1fqJtP6
this.indexes = indexes; %![3?|8~
} T,/:5L9
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publicint getStartIndex(){ 9y?)Ga
return startIndex; odhcU5
} !![HR6"Q
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publicvoid setStartIndex(int startIndex){ pB'{_{8aA
if(totalCount <= 0) \EW<;xq
this.startIndex = 0; qu%}b>
elseif(startIndex >= totalCount) )Y:C'*.r
this.startIndex = indexes .qS(-7<
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[indexes.length - 1]; HwZ"l31
elseif(startIndex < 0) @7`=0;g
this.startIndex = 0; GUC.t7!
else{ ^T*'B-`C7X
this.startIndex = indexes 9w dl1QS
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[startIndex / pageSize]; wyB
} $[V-M\q
} T!Nv
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publicint getNextIndex(){ )8%m|v#W
int nextIndex = getStartIndex() + nd~O*-uYg
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pageSize; N2.Ym;^
if(nextIndex >= totalCount) xjh(;S'
return getStartIndex(); >hO9b;F}
else /~3kkM(Ty
return nextIndex; Mb=j'H<N@
} c'
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publicint getPreviousIndex(){ E7 P'}
int previousIndex = getStartIndex() - P(aN6)D
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pageSize; Igh=Z %
if(previousIndex < 0) Y3O/`-9i
return0; rw.DKM'
else rIeOli:<
return previousIndex; +%R{j|8#
} t6Nkv;)>@
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抽象业务类 ,j(S'Pw
java代码: T
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/** f&!{o=
* Created on 2005-7-12 y wmC>`0p
*/ [:8+ +#KD
package com.javaeye.common.business; s[#_sR`y
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import java.io.Serializable; La$?/\Dv)
import java.util.List; BMb0Pu8
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import org.hibernate.Criteria; *g"Xhk
import org.hibernate.HibernateException; AI]lG]q8
import org.hibernate.Session; ZG(Pz9{K
import org.hibernate.criterion.DetachedCriteria; cnB:bQQK8
import org.hibernate.criterion.Projections; b\p2yJ\
import mD7kOOMY
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org.springframework.orm.hibernate3.HibernateCallback; |?t}7V#[
import {_ {zs!r
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org.springframework.orm.hibernate3.support.HibernateDaoS Y%^qt]u.8
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upport; 28>/#I9/]
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import com.javaeye.common.util.PaginationSupport; ]v#T9QQN
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public abstract class AbstractManager extends A`*Sx"~jdx
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HibernateDaoSupport { WmuYHE U
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privateboolean cacheQueries = false; kOQ!]-;
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privateString queryCacheRegion; V W( +sSQ
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publicvoid setCacheQueries(boolean Q-KBQc
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cacheQueries){ |xrnLdng0R
this.cacheQueries = cacheQueries; \lF-]vz*
} Bw>)gSB5$k
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publicvoid setQueryCacheRegion(String ijmGk:L(
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queryCacheRegion){ mXI'=Vo!S
this.queryCacheRegion = 6L3i
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queryCacheRegion; T:g%b @
} *d:$vaL
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publicvoid save(finalObject entity){ zT ")!Df>'
getHibernateTemplate().save(entity); VBz
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} Z GrDa
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publicvoid persist(finalObject entity){ :XB^IyO-A
getHibernateTemplate().save(entity); aX?
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} W8M(@*
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publicvoid update(finalObject entity){ Lc0=5]D
getHibernateTemplate().update(entity); ?N&s.
} 1ezBnZJg
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publicvoid delete(finalObject entity){ d?aZk-|c
getHibernateTemplate().delete(entity); ,3W,M=j)
} Y?:"nhN
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publicObject load(finalClass entity, *9(E0"
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finalSerializable id){ @4$la'XSx
return getHibernateTemplate().load gdS@NUM
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(entity, id); _gQ_ixu
} ) .W0}
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publicObject get(finalClass entity, !e}4>!L,(^
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finalSerializable id){ |k]fY*z(
return getHibernateTemplate().get !J[! i"e
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(entity, id); e8{!Kjiz
} oE)xL%*
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publicList findAll(finalClass entity){ '`j MNKn\
return getHibernateTemplate().find("from OV`li#H
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" + entity.getName()); 7,Y+FZ
} 7V&ly{</
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publicList findByNamedQuery(finalString ]j]<CqG
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namedQuery){ 63kZ#5g(Dw
return getHibernateTemplate TjOK8
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().findByNamedQuery(namedQuery); `:Zgq+j&
} !{vZvy"
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publicList findByNamedQuery(finalString query, on
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finalObject parameter){ @>+`1C
return getHibernateTemplate 5m\)82s
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().findByNamedQuery(query, parameter); 4GS:kfti
} I>lblI$7
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publicList findByNamedQuery(finalString query, zb.sh
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finalObject[] parameters){ ,m M7g
return getHibernateTemplate <DhuY/o
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().findByNamedQuery(query, parameters); ]PB95%
} l@`n4U.Gwl
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publicList find(finalString query){ L;fz7?_j
return getHibernateTemplate().find =)J)xH!N
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(query); ?(M]'ia{
} G> sqfYkK
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publicList find(finalString query, finalObject $g\p)- aU
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parameter){ @eYD@!
return getHibernateTemplate().find E,QD6<?[
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(query, parameter); %!R\-Vej
} % -.V6}V
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public PaginationSupport findPageByCriteria -i]2b
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(final DetachedCriteria detachedCriteria){ q[x|tO
return findPageByCriteria *r ('A
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); rd,!-w5
} Rb0{W]opt+
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public PaginationSupport findPageByCriteria <kazV<"
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(final DetachedCriteria detachedCriteria, finalint 10_>EY`
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startIndex){ uEkGo5
return findPageByCriteria ;aH3{TS
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(detachedCriteria, PaginationSupport.PAGESIZE, zL3I!& z2
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startIndex); e@PY(#ru
} [_*?~
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public PaginationSupport findPageByCriteria I0G[K~gb
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(final DetachedCriteria detachedCriteria, finalint 4D6LP*
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pageSize, 0Y8Cz /$
finalint startIndex){ CDT;AdRw7
return(PaginationSupport) #<es>~0!
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getHibernateTemplate().execute(new HibernateCallback(){ oVd7ucnK
publicObject doInHibernate iKv"200h(
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(Session session)throws HibernateException { b]*OGp4]5
Criteria criteria = }\1IsK~P
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detachedCriteria.getExecutableCriteria(session); f67t.6Vw2+
int totalCount = Su<>UsdUC
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((Integer) criteria.setProjection(Projections.rowCount 8&CQx*
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()).uniqueResult()).intValue(); b`;Cm)@X!)
criteria.setProjection HTSk40V
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(null); !PgwFJ
List items = Us_1 #$p,
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criteria.setFirstResult(startIndex).setMaxResults %0'7J@W
{D8yqO A}
(pageSize).list(); Ged} qXn
PaginationSupport ps = #Fkp6`Q$x
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new PaginationSupport(items, totalCount, pageSize, y s[ z[
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startIndex); SQ<{X/5
return ps; B[d%?L_
} F:A Vik
}, true); z Ece>=C
} Lzx2An@R
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public List findAllByCriteria(final pk6<wAs*?#
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DetachedCriteria detachedCriteria){ HrUE?Sq
return(List) getHibernateTemplate BadnL<cj]
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().execute(new HibernateCallback(){ EtQ:x$S_
publicObject doInHibernate r6It)PQ
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(Session session)throws HibernateException { #VsS C1
Criteria criteria = 1/%5pb2\
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detachedCriteria.getExecutableCriteria(session); Kaji&Ibd
return criteria.list(); D-e?;<
} q``/7
}, true); -]G=Q1 1
} q9c-UQB(!
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public int getCountByCriteria(final 2SlI5+u
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DetachedCriteria detachedCriteria){ 6#ktw)e
Integer count = (Integer) MjK<n[.
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getHibernateTemplate().execute(new HibernateCallback(){ t_+owiF)M
publicObject doInHibernate &w:0ad|
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(Session session)throws HibernateException { Bq,MTzxD
Criteria criteria = WA.c.{w\
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detachedCriteria.getExecutableCriteria(session); ULO_?4}B
return mZ.gS1Dq
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criteria.setProjection(Projections.rowCount uUe#+[bD
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()).uniqueResult(); #"C!-kS'=
} M|R\[
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}, true); 3,J{!
return count.intValue(); GGUwS
} +jO#?J
} bGK-?BE5+A
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用户在web层构造查询条件detachedCriteria,和可选的 2iC BF-,
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ?QtM|e
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PaginationSupport的实例ps。 .N7&Jy
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ps.getItems()得到已分页好的结果集 O`Htdnu
ps.getIndexes()得到分页索引的数组 t{`uN
ps.getTotalCount()得到总结果数 Jgy6 !qUn_
ps.getStartIndex()当前分页索引 B] Koi1B
ps.getNextIndex()下一页索引 %.8(R
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ps.getPreviousIndex()上一页索引 Oq(FV[N7t
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ry+|gCZ
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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 }H/94]~tH
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一下代码重构了。 QBA{*@ A-
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我把原本我的做法也提供出来供大家讨论吧: ,+x\NY2d
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首先,为了实现分页查询,我封装了一个Page类: S_s;foT
java代码: G0Z$p6z
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/*Created on 2005-4-14*/ 4C3i
package org.flyware.util.page; u,~+ho@
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/** ?P}) Qa
* @author Joa X>Z83qV5d!
* I*pFX0+
*/ Z/;hbbG
publicclass Page { ;KG}Yr72
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/** imply if the page has previous page */ .!'rI7Kz'i
privateboolean hasPrePage; Kr`.q:0GK
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/** imply if the page has next page */ fT=ZiHJ3Gu
privateboolean hasNextPage; I/gfsyfA
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/** the number of every page */ `.wgRUhFH;
privateint everyPage; w1
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}IQ! [T5
/** the total page number */ [geT u
privateint totalPage; |7.X)h`
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/** the number of current page */ @JOsG-VW~
privateint currentPage; @@}muW>;T
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/** the begin index of the records by the current G#='*vOtO
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query */ xX~m Fz0C
privateint beginIndex; k1LbWR1%wB
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/** The default constructor */ R5 EC/@
public Page(){ v4\
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} WK.,q>#
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/** construct the page by everyPage YP{mzGdE&