Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 R{_IrYk
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Ne
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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 (#]KjpIK
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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 $nn5;11@gY
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分页支持类: ^q\zC%.
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java代码: 0
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package com.javaeye.common.util; RZA\-?cO)
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import java.util.List; 3G^Ed)JvE
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publicclass PaginationSupport { EB<q.
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publicfinalstaticint PAGESIZE = 30; QEa=!O
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privateint pageSize = PAGESIZE; VKz<7K\/
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privateList items; Wh5O{G@Ut
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privateint totalCount; ?` i/
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privateint[] indexes = newint[0]; u7WM6X
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privateint startIndex = 0; ^ {f^WL=
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public PaginationSupport(List items, int WmUW
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totalCount){ Ir #V2]$
setPageSize(PAGESIZE); z D<9A6AB
setTotalCount(totalCount); `gN68:B
setItems(items); <t% A)L%
setStartIndex(0); VY@hhr1s~
} g/p9"eBpq
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public PaginationSupport(List items, int 2j1v.%
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totalCount, int startIndex){ *J5RueUG
setPageSize(PAGESIZE); |wQZ~Ux:
setTotalCount(totalCount); ue<<Y"NR
setItems(items); P1 stL,
setStartIndex(startIndex); s$x] fO
} yMl'1W
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public PaginationSupport(List items, int 3z92Gy5cr
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totalCount, int pageSize, int startIndex){ sA-W^*+
setPageSize(pageSize); _x6E_i-(
setTotalCount(totalCount); q-
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setItems(items); \N+Ta:U1P
setStartIndex(startIndex); ID# qKFFW
} cu!bg+,zl
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publicList getItems(){ i03}f%JnuO
return items; ^jjJM| a
} E:=KH\2f
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publicvoid setItems(List items){ O) %kl
this.items = items; [.xk
} cjC6\.+l3
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publicint getPageSize(){ zy6(S_j
return pageSize; a<jE25t
} #aY<J:Nx
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publicvoid setPageSize(int pageSize){ fhIj+/{_O
this.pageSize = pageSize; afiK!0col2
} 8~(+[[TQ@
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publicint getTotalCount(){ [=ak>>8
return totalCount; 'ag6B(0Z
} dIa(</ }
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publicvoid setTotalCount(int totalCount){ GL =XiBt
if(totalCount > 0){ s8Ry}{
this.totalCount = totalCount; V/9"Xmv75
int count = totalCount / ,9tbu!Pvq
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pageSize; ^Xy$is3
if(totalCount % pageSize > 0) <C"N X
count++; ,x"yZ
indexes = newint[count]; QC5f:BwM
for(int i = 0; i < count; i++){ ^Z4q1i)JO
indexes = pageSize * l3?,gd.-
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} &Dg)"Xji
}else{ u4,X.3V]A
this.totalCount = 0; b}&7~4zw
} + }XL>=-5
} ciGpluQF
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publicint[] getIndexes(){ N'
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return indexes; v7<S F
} Prb_/B Dd
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publicvoid setIndexes(int[] indexes){ -8Jl4F ,
this.indexes = indexes; *- IlF]
} #"p1Qea$
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publicint getStartIndex(){ JdUz!=I
return startIndex; r5!x,{E6
} ^o6)[_L
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publicvoid setStartIndex(int startIndex){ E7NbPNd
if(totalCount <= 0) g t^]32$
this.startIndex = 0; 2VV[*QI
elseif(startIndex >= totalCount) ,KhMzE8_a
this.startIndex = indexes B==a
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[indexes.length - 1]; #ON#4WD?
elseif(startIndex < 0) 3aE[F f[
this.startIndex = 0; ^M(`/1 :
else{ R2Rstk
this.startIndex = indexes ICl_ eb
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[startIndex / pageSize]; zJuRth)(,
} 4)odFq:
} *pb:9JKi
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publicint getNextIndex(){ PJK]t7vp
int nextIndex = getStartIndex() + .kbr?N,'
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pageSize; qJX+[PJ
if(nextIndex >= totalCount) B3cf] S%
return getStartIndex(); R?bn,T>
else GcZM+ c
return nextIndex; l~fh_IV1
} xgtJl}L
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publicint getPreviousIndex(){ 5?3Isw`v2
int previousIndex = getStartIndex() - VBbUl|X\
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pageSize; g,n-s+
if(previousIndex < 0) QIij>!c4
return0; 42Aje
else -SQJH}zCT+
return previousIndex; ~A[YnJYA#
} fuNl4BU
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} q)K-vt)98
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抽象业务类 0NL :z1N-h
java代码: }.fL$,7a
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/** [<D+pqh
* Created on 2005-7-12 d3EjI6R*z
*/ Wk/fB0
package com.javaeye.common.business; eZ!yPdgy|
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import java.io.Serializable; n\Z^K
import java.util.List; 9USrgY6_
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import org.hibernate.Criteria; lp:_H-sG
import org.hibernate.HibernateException; wD<vg3e[H
import org.hibernate.Session; H<V+d^qX\w
import org.hibernate.criterion.DetachedCriteria; "[awmZ:wo
import org.hibernate.criterion.Projections; ky'|Wk6
import }Q`/K;yq
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org.springframework.orm.hibernate3.HibernateCallback; fzLANya
import >lA7*nn
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org.springframework.orm.hibernate3.support.HibernateDaoS tW:W&|q
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upport; i%xI9BO9
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import com.javaeye.common.util.PaginationSupport; zTkFX67)
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public abstract class AbstractManager extends NV&;e[z
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HibernateDaoSupport { K{|w 43>D
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privateboolean cacheQueries = false; :L]-'\y
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privateString queryCacheRegion; K1;zMh
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publicvoid setCacheQueries(boolean 1T!cc%ah
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cacheQueries){ U!x0,sr
this.cacheQueries = cacheQueries; 6e,Apj 0
} 5_v5
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publicvoid setQueryCacheRegion(String O-i4_YdVt
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queryCacheRegion){ d?JAUbqy
this.queryCacheRegion = +<gg
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queryCacheRegion; D`V6&_.p
} +z+F-
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publicvoid save(finalObject entity){ '^hsH1
getHibernateTemplate().save(entity); k - FB
} ,(6)ghr
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publicvoid persist(finalObject entity){ =ntftSH
getHibernateTemplate().save(entity); j(&GVy^;?
} HB%K|&!+
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publicvoid update(finalObject entity){ 6j_ 678
getHibernateTemplate().update(entity); ol50d73B
} :
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publicvoid delete(finalObject entity){ u',b1 3g(
getHibernateTemplate().delete(entity); 5;}2[3}[
} WmNA5;<Q
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publicObject load(finalClass entity, @]*[c})/
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finalSerializable id){ B\f"Iirw
return getHibernateTemplate().load g-XKP
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(entity, id); >A<Df
} *E.LP1xP
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publicObject get(finalClass entity, U4=]#=R~o
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finalSerializable id){ AHq M7+r9
return getHibernateTemplate().get b)d^ `J
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(entity, id); 2_wvC
} su}&".e^
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publicList findAll(finalClass entity){ 00"CC
return getHibernateTemplate().find("from /\d(c/, 4
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" + entity.getName()); *u}'}jC1X
} 7q!?1 -?8R
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publicList findByNamedQuery(finalString lVP |W:~K
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namedQuery){ _p0)vT
return getHibernateTemplate w;~>k%}j
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().findByNamedQuery(namedQuery); =)(0.E
} C\OECVT
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publicList findByNamedQuery(finalString query, o OQ'*7_
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finalObject parameter){ @cPflb
return getHibernateTemplate Vu%n&uF
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().findByNamedQuery(query, parameter); 0 k9<&
}
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publicList findByNamedQuery(finalString query, /22nLc;/Cx
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finalObject[] parameters){ Xo\S9,s{
return getHibernateTemplate eSn$k:\W
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().findByNamedQuery(query, parameters); 9)Ly}Kzx
} *,0+RAS vq
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publicList find(finalString query){ &8n?
return getHibernateTemplate().find ?~Pv3'%d
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(query); _KN:
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} Ev{MCu1!6
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publicList find(finalString query, finalObject iy}xICt
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parameter){ _$5@uL{n"^
return getHibernateTemplate().find `w+1C&>^[
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(query, parameter); >L=;"+B0U&
} modC6d%
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public PaginationSupport findPageByCriteria T<6GcI>A
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(final DetachedCriteria detachedCriteria){ *7Xzht&f
return findPageByCriteria z0
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); lH6fvz
} o<rsAe
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public PaginationSupport findPageByCriteria Fm5Q&'`l
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(final DetachedCriteria detachedCriteria, finalint j`9Qzi1
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startIndex){ 5{X*a
return findPageByCriteria IJ_ m
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(detachedCriteria, PaginationSupport.PAGESIZE, X$^JAZ09
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startIndex); :BD>yOlG
} /tZ0
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public PaginationSupport findPageByCriteria ]Jn2Ra"j
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(final DetachedCriteria detachedCriteria, finalint 03_pwB)^
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pageSize, WqQU@sA
finalint startIndex){ #w|5jN?
return(PaginationSupport) dlR_ckp
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getHibernateTemplate().execute(new HibernateCallback(){ qnXTNs
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publicObject doInHibernate |IN[uQ
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(Session session)throws HibernateException { AG>\aV"b
Criteria criteria = o0mJy'
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detachedCriteria.getExecutableCriteria(session); ?oKL&I@
int totalCount = R5kH0{zM
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((Integer) criteria.setProjection(Projections.rowCount Y{+3}drJE
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()).uniqueResult()).intValue(); ?4[NNL
criteria.setProjection 9yL6W'B!
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(null); q:]Q% IC^
List items = =$&&[&
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criteria.setFirstResult(startIndex).setMaxResults !iJipe5
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(pageSize).list(); (NaK3_
PaginationSupport ps = E}YIWTX
9!#EwPD$#
new PaginationSupport(items, totalCount, pageSize, gr+Pl>C{
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startIndex); 6 64q~_@B1
return ps; 7n&yv9"
} p+ Lv=e)0u
}, true); 2*'ciH37
} ]0-<>
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public List findAllByCriteria(final QN g\4%
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DetachedCriteria detachedCriteria){ VB"(9O]
return(List) getHibernateTemplate 5v|EAjB6o
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().execute(new HibernateCallback(){ tvpN/p
publicObject doInHibernate Nfaf;;J}
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(Session session)throws HibernateException { N|Habua<Xw
Criteria criteria = DFy1 bg
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detachedCriteria.getExecutableCriteria(session); n&d/?aJ7a\
return criteria.list(); s)w9%
} A ~&+F>Z
}, true); X"<|Z]w
} @GeHWv
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public int getCountByCriteria(final bV6V02RF
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DetachedCriteria detachedCriteria){ a+
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Integer count = (Integer) doLNz4W
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getHibernateTemplate().execute(new HibernateCallback(){ E9$H nj+m
publicObject doInHibernate B*79qq
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(Session session)throws HibernateException { D^?_"wjW
Criteria criteria = MLS;SCl
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detachedCriteria.getExecutableCriteria(session); 9rcI+q=E
return lT,+bU
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criteria.setProjection(Projections.rowCount ]sL45k2W
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()).uniqueResult(); N!c
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} ChE_unw
}, true); vgThK9{m;
return count.intValue(); w}`3 d@
} hSMV&Cs
} P
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用户在web层构造查询条件detachedCriteria,和可选的 XTo8,'UaP
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 *U_oao
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PaginationSupport的实例ps。 v8'5pLt"
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ps.getItems()得到已分页好的结果集 =x
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ps.getIndexes()得到分页索引的数组 6N3@!xtpi
ps.getTotalCount()得到总结果数 %),!2_ x~
ps.getStartIndex()当前分页索引 *s\sa+2al
ps.getNextIndex()下一页索引 /80YZ
ps.getPreviousIndex()上一页索引 .'lN4x
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 7#pZa.B)k
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 j@ v-|
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一下代码重构了。 yekRwo|
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我把原本我的做法也提供出来供大家讨论吧: dtTlIhh1V
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首先,为了实现分页查询,我封装了一个Page类: plXG[1;&G
java代码: jONjt(&N
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/*Created on 2005-4-14*/ q[c Etp28h
package org.flyware.util.page; 5-w: c>
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/** NvHN -^2
* @author Joa X9~p4ys9{
* {^m5#f 0"
*/ P(;Mb{
publicclass Page { ]o*$h$? s
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/** imply if the page has previous page */ CZ tiWZ
privateboolean hasPrePage; M/B/b<['
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/** imply if the page has next page */ w-FHhf
privateboolean hasNextPage; ]^'ZiyJX
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/** the number of every page */ kzi|$Gs<