Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 [ibnI2I]`
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 )f,iey\-
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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 Fd0R?d
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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 t}]=5)9<
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分页支持类: LKTIwb>
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java代码: ^Qq_|{vynf
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package com.javaeye.common.util; 4OC^IS
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import java.util.List; *i&ks>4N
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publicclass PaginationSupport { <-FAF:6$@@
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publicfinalstaticint PAGESIZE = 30; `!
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privateint pageSize = PAGESIZE; '4ftclzL
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privateList items; $O?&!8);,
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privateint totalCount; T5Yu+>3
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privateint[] indexes = newint[0]; zXIVHC,"{
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privateint startIndex = 0; ~4<xTP\*
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public PaginationSupport(List items, int t[Qf|#g
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totalCount){ gQ6_]~4
setPageSize(PAGESIZE); 2h%/exeS;
setTotalCount(totalCount); pxDkf|*
setItems(items); Et}S*!IS
setStartIndex(0); Se{}OG)
} `O5wM\Z
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public PaginationSupport(List items, int C|*U)#3:F
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totalCount, int startIndex){ I r]#u]Ap
setPageSize(PAGESIZE); OWx-I\:
setTotalCount(totalCount); j]Kpwf<NS
setItems(items); {Cd Q)|
setStartIndex(startIndex); Zi/tax9C
} u$O`
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public PaginationSupport(List items, int ark~#<SqAr
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totalCount, int pageSize, int startIndex){ H,u {zU')
setPageSize(pageSize); }>]V_}h
setTotalCount(totalCount); &{-r 5d23
setItems(items); m<}>'DT
setStartIndex(startIndex); 6#hDj_(,
} IOhJL'r
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publicList getItems(){ V"K-aO&
return items; XYj!nx{k,
} I&vD >a5#
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publicvoid setItems(List items){ y(^t &tgjS
this.items = items; :7>oFz
} 42]hX9E
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publicint getPageSize(){ xq$(=WPI
return pageSize; 69N/_V
} >xsbXQ>.
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publicvoid setPageSize(int pageSize){ o^+2%S`]
this.pageSize = pageSize; 5nF46c
} +Np[m$Z*
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publicint getTotalCount(){ 'o}v{f
return totalCount; P|j|0o,8p
} v]{F.N
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publicvoid setTotalCount(int totalCount){ {G. W?
if(totalCount > 0){ *@)0TL(03
this.totalCount = totalCount; 08czP-)OZ
int count = totalCount / BA(erf>
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pageSize; F \0>/
if(totalCount % pageSize > 0) C-)mP- |8
count++; 2~`vV'K
indexes = newint[count]; L)(JaZyV5
for(int i = 0; i < count; i++){ 1V
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indexes = pageSize * 7M8oI.?C|
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} ;z2\ Q$
}else{ ?qC6p|H
this.totalCount = 0; vbBNXy/
} ahICx{hK
} NVnId p
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publicint[] getIndexes(){ RW-)({
return indexes; 05>mR qVL
} c~``)N
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publicvoid setIndexes(int[] indexes){ 'Dn\.x^]1
this.indexes = indexes; [J!jp&o
} A4uKE"WE
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publicint getStartIndex(){ @6lw_E_5
return startIndex; *qa.hqas
} S4 j5-
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publicvoid setStartIndex(int startIndex){ / <C{$Gu
if(totalCount <= 0) IN8G4\r
this.startIndex = 0; 6;:z?Q
elseif(startIndex >= totalCount) \1Xr4H
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this.startIndex = indexes pq"Z,9,F%
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[indexes.length - 1]; OI^??joQ
elseif(startIndex < 0) ^ YOCHXg
this.startIndex = 0; PfR|\{(
else{ v*";A
this.startIndex = indexes ;NMv>1fI
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[startIndex / pageSize]; jFDVd;#CS
} I=[Ir8};
} 9| g]M:{
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publicint getNextIndex(){ VQ"Z3L3-4
int nextIndex = getStartIndex() + .} O@<t
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pageSize; ty8>(N(~
if(nextIndex >= totalCount) w!dgIS$
return getStartIndex(); d88Dyzz
else +0ALO%G;G"
return nextIndex; _`I}"`2H
} v!`:{)2C
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publicint getPreviousIndex(){ ;~-ZN?8
int previousIndex = getStartIndex() - TMsc5E
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pageSize; jj&mRF0gCb
if(previousIndex < 0) 2U|"]tpM&
return0; 3qW](
else Z=9<esx
return previousIndex; nR]*RIp5
} v<@3&bot
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} J@o_-\@
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抽象业务类 }_Ci3|G>%D
java代码: 6:~<L!`&
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/** g`z;:ao
* Created on 2005-7-12 E~@&&dU8
*/ 2qdc$I&$
package com.javaeye.common.business; sYhHh$mwA
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{
import java.io.Serializable; GrUpATIx
import java.util.List; bf=!\L$
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import org.hibernate.Criteria; `_k_}9Fr
import org.hibernate.HibernateException; .-'_At4g
import org.hibernate.Session; w`DcnQK'
import org.hibernate.criterion.DetachedCriteria; -%Rw2@vU
import org.hibernate.criterion.Projections; KPVu-{_Fi
import ZZw2m@T>
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org.springframework.orm.hibernate3.HibernateCallback; IL`LIJ:O
import =xQPg0g
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org.springframework.orm.hibernate3.support.HibernateDaoS QOX'ZAB`
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upport; :>}7^1I
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import com.javaeye.common.util.PaginationSupport; 3@nIoN'z
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public abstract class AbstractManager extends (*M0'5
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HibernateDaoSupport { 2D(sA
deQ {
privateboolean cacheQueries = false; b#
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privateString queryCacheRegion; <FX]n<
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publicvoid setCacheQueries(boolean .sc80i4
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cacheQueries){ [,MaAB
this.cacheQueries = cacheQueries; L8q#_k
} ` ZZ3!$czR
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publicvoid setQueryCacheRegion(String $EHFf$M
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queryCacheRegion){ \!hd|j?&6
this.queryCacheRegion = -Bq]E,Xf)
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queryCacheRegion; ySI}Nm>&=
} A;5_/ 2
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publicvoid save(finalObject entity){ 15VvZ![$V
getHibernateTemplate().save(entity); W\($LD"X
} Yecdw'BW?
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publicvoid persist(finalObject entity){ C=CZtjUt
getHibernateTemplate().save(entity); qRgFVX+vc
} w:9`R<L
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publicvoid update(finalObject entity){ xbxzB<yL
getHibernateTemplate().update(entity); {Mj- $G"
} TQ:h[6v
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publicvoid delete(finalObject entity){ [MQ* =*
getHibernateTemplate().delete(entity); kOdA8XRY
} "N">RjJ"
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publicObject load(finalClass entity, 1;KJUf[N
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finalSerializable id){ ~%lA!tsek
return getHibernateTemplate().load m,"-/)
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(entity, id); YcV^Fqi!
} w >%^pO~}`
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publicObject get(finalClass entity, |'&$VzA
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finalSerializable id){
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return getHibernateTemplate().get -T;^T1
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(entity, id); PjX V.gz
} YD@Z}NE
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publicList findAll(finalClass entity){ [3sZ=)G
return getHibernateTemplate().find("from E<}sGzMc
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" + entity.getName()); ~(^pGL3<
} F+*fim'NK
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publicList findByNamedQuery(finalString l.]wBH#RS
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namedQuery){ VwRZgL
return getHibernateTemplate E%;$vj'2
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().findByNamedQuery(namedQuery); n_rpT.[
} 9BpxbU+L;
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publicList findByNamedQuery(finalString query, SOX7
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finalObject parameter){ 94et ]u%7
return getHibernateTemplate 6$:Q]zR#'H
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().findByNamedQuery(query, parameter); wdf;LM
} *U6+b
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publicList findByNamedQuery(finalString query, {$Uj&/IC
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finalObject[] parameters){ k0N>J8y
return getHibernateTemplate po'b((q
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().findByNamedQuery(query, parameters); 16]Ay&Kn!
} ra6\+M~}e
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publicList find(finalString query){ Y3~z#<
return getHibernateTemplate().find K?[Vz[-Fc
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(query); ZA. SX|m
} 1ig*Xp[
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publicList find(finalString query, finalObject ja~Dp5
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parameter){ U?Dr0wD;[
return getHibernateTemplate().find J=78p#XUg
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(query, parameter); [<{r~YFjWW
} JFO,Q
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public PaginationSupport findPageByCriteria #]5KWXC'~
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(final DetachedCriteria detachedCriteria){ N>YSXh`W`y
return findPageByCriteria ?;htK_E\*
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); V sxI
} 'I+M*Iy
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public PaginationSupport findPageByCriteria <9
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(final DetachedCriteria detachedCriteria, finalint *P9" 1K+
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startIndex){ Vt3*~Beb
return findPageByCriteria ?wlRHVZ
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(detachedCriteria, PaginationSupport.PAGESIZE, $#+D:W)az
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startIndex); 8x)i{>#i
} _EP]|DTfr
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public PaginationSupport findPageByCriteria 82ixv<B
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(final DetachedCriteria detachedCriteria, finalint Z2yO /$<
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pageSize, YLTg(*
finalint startIndex){ n.a2%,|v
return(PaginationSupport) H"^9g3U
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getHibernateTemplate().execute(new HibernateCallback(){ ,g}$u'A+d
publicObject doInHibernate [jlum>K
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(Session session)throws HibernateException {
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Criteria criteria = S'qT+pP
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detachedCriteria.getExecutableCriteria(session); / [49iIzC
int totalCount = 'dh{q`#0
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((Integer) criteria.setProjection(Projections.rowCount J^7M0A4K
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()).uniqueResult()).intValue(); 1hCU"|VH:
criteria.setProjection 0iZeU:FE
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(null); UP)<(3YA
List items =
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criteria.setFirstResult(startIndex).setMaxResults Ri`6X_xU
&dWGa+e
(pageSize).list(); ttJ'6lGXh
PaginationSupport ps = hx;kNcPbI
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new PaginationSupport(items, totalCount, pageSize, 1aIGC9xQ`
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startIndex); 3{~(_
return ps; Spx%`O<
} r9N?z2X
}, true); Cj4Y, N
} fU
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public List findAllByCriteria(final CP;<B1
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DetachedCriteria detachedCriteria){ @{fwM;me]P
return(List) getHibernateTemplate #[x*0K-h
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().execute(new HibernateCallback(){ G8__6v~
publicObject doInHibernate SE' |||B
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(Session session)throws HibernateException { !e<2o2~.
Criteria criteria = gI2'[OU
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detachedCriteria.getExecutableCriteria(session); ?t6wozib2
return criteria.list(); MK/8<i<.
} tF-l=ph}`
}, true); n!~ $Z/
} 8]vut{
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public int getCountByCriteria(final G;vj3#u?
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DetachedCriteria detachedCriteria){ ?qSwV.l]d
Integer count = (Integer) 2bw), W
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getHibernateTemplate().execute(new HibernateCallback(){ BH~zeJ*Pr
publicObject doInHibernate r0[<[jEh
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(Session session)throws HibernateException { h
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Criteria criteria = CYE[$*g6y
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detachedCriteria.getExecutableCriteria(session); %>9L}OAm
return bfncO[Q,?
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criteria.setProjection(Projections.rowCount ~F,YBX
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()).uniqueResult(); Da8gOZ
} Xp06sl7 M
}, true); ic!% } S?
return count.intValue(); d
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} yFmy
} o^(I+ <el
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用户在web层构造查询条件detachedCriteria,和可选的 (2Lmu[
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ^W@8KB
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PaginationSupport的实例ps。 sxRKWM@4
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ps.getItems()得到已分页好的结果集 fDW:|%{Y,
ps.getIndexes()得到分页索引的数组 ]ke9ipj]:
ps.getTotalCount()得到总结果数 d(V4;8a0
ps.getStartIndex()当前分页索引 Bnk<e
ps.getNextIndex()下一页索引 <Rn-B).3bs
ps.getPreviousIndex()上一页索引 L?|}!
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 |1A0YjOD
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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 |X XO0
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一下代码重构了。 R(&3})VOa
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我把原本我的做法也提供出来供大家讨论吧: .IY@Q
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首先,为了实现分页查询,我封装了一个Page类: mP6}$D
java代码: gSwHPm%zn
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/*Created on 2005-4-14*/ Y7qQ`|
package org.flyware.util.page; lo6upirZX
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/** DQ/rx`BG
* @author Joa u$5.GmKm
* 9__Q-J
*/ p8-$MF]]6
publicclass Page { K$}K2w
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/** imply if the page has previous page */ +'93%/:
privateboolean hasPrePage; YG=:lf
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/** imply if the page has next page */ hPG@iX|V
privateboolean hasNextPage; )l
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/** the number of every page */ <Dgf'GrJ
privateint everyPage; ?,v&
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/** the total page number */ tg 'g R
privateint totalPage; : 4-pnn
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/** the number of current page */ qj:[NPwaM
privateint currentPage; keD?#yY
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/** the begin index of the records by the current II _CT=
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query */ rB]2qk`/'
privateint beginIndex; ~rjK*_3/
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/** The default constructor */ }Ptv[{q]GE
public Page(){ [hH>BEtm
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} kxyOe[7 S
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/** construct the page by everyPage $\]Mvd
* @param everyPage S[y_Ewzq
* */ gG.+3=
public Page(int everyPage){ hMS:t(N{
this.everyPage = everyPage; OKau3T]
} Y^d#8^cP
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/** The whole constructor */ 4)}>dxv
public Page(boolean hasPrePage, boolean hasNextPage, l]t^MEoc8
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5
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int everyPage, int totalPage, ZvC?F=tH
int currentPage, int beginIndex){ ZR)M<