Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 w@cW`PlF
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 XJ3sqcS
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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 hPBBXj/=
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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 b- t
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分页支持类: |> ]@w\]
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java代码: Ri" hU/H{
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package com.javaeye.common.util; lRg?||1ik
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import java.util.List; S5TVfV5LI
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publicclass PaginationSupport { vQi=13Pw
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publicfinalstaticint PAGESIZE = 30; o$.#A]Flb
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privateint pageSize = PAGESIZE; Ei @
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privateList items; Zhfg
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privateint totalCount; zs#-E_^%M
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privateint[] indexes = newint[0]; VmPh''Z%-
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privateint startIndex = 0; @s-P!uCaT
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public PaginationSupport(List items, int 4};@QFT*
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totalCount){ K& ^qn&
setPageSize(PAGESIZE); $"/l*H\h
setTotalCount(totalCount); apa&'%7
setItems(items); I &iyj99n
setStartIndex(0); iiq
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} `Uz.9_6
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public PaginationSupport(List items, int 9S]pC?N]E
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totalCount, int startIndex){ W$hCI)m(
setPageSize(PAGESIZE); ~q566k!Ll!
setTotalCount(totalCount); PkDt-]G.
setItems(items); /r~2KZE
setStartIndex(startIndex); 9abUh3
} j
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public PaginationSupport(List items, int ?{TWsuP7
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totalCount, int pageSize, int startIndex){ G)<B7-72;
setPageSize(pageSize); *x2!N$b
setTotalCount(totalCount); jV*10kM<
setItems(items); \ejHM}w3,
setStartIndex(startIndex); i;{lY1
} '/qy_7O
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publicList getItems(){ \}h
return items; 0#TL$?=|
}
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publicvoid setItems(List items){ HUjX[w8
this.items = items; k F^4kCJ@
} LQ k^l`
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publicint getPageSize(){ !dwZ` D
return pageSize; {E%c%zzQ
} IH=$
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publicvoid setPageSize(int pageSize){ DqWy@7
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this.pageSize = pageSize; C~4SPCU
} E0RqY3
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publicint getTotalCount(){ Ojz'p5d`>
return totalCount; T1$p%yQH
} Nzgi)xX0HX
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publicvoid setTotalCount(int totalCount){ uz+WVmb
if(totalCount > 0){ 2iM}YCV
this.totalCount = totalCount; v\dQjQu8m
int count = totalCount / Tk[]l7R~
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pageSize; :@jctH~
if(totalCount % pageSize > 0) %ZD]qaU0
count++; P\K#q%8
indexes = newint[count]; DgcS@N
for(int i = 0; i < count; i++){ %J2Ad
indexes = pageSize * b?OA |JqX
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} y'`7zJ
}else{ .9e5@@VR
this.totalCount = 0; !;8Y?c-D
} '8zd]U
} 7+f6?
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publicint[] getIndexes(){ x&DqTX?b,
return indexes; |Q)mBvvN
} *#>(P
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publicvoid setIndexes(int[] indexes){ D~ 3@v+d
this.indexes = indexes; MzUKp"
} x[};x;[ZE
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publicint getStartIndex(){ bP-(N14x+
return startIndex; b-8@_@f|g
} {+#{Cha
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publicvoid setStartIndex(int startIndex){ &)6}.$`
if(totalCount <= 0) 2?%4|@*H?
this.startIndex = 0; jj2=|)w$3
elseif(startIndex >= totalCount) kOo Vqu
this.startIndex = indexes ?jfh'mCA
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[indexes.length - 1]; J \|~k2~
elseif(startIndex < 0) KRlJKd{
this.startIndex = 0; 8tSY|ME
else{ oQh;lb
this.startIndex = indexes r=3`Eb"t
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[startIndex / pageSize]; Bj4c_YBte
} vkJyD/;=
} *LhwIY
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publicint getNextIndex(){ 'Up75eT
int nextIndex = getStartIndex() + RQWUO^&e^
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pageSize; ):hz/vZ
if(nextIndex >= totalCount) ]vB^%
return getStartIndex(); N[O .p]8
else ){P`-ZF
return nextIndex; >WZ%Pv*
} (BtU\f#d
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publicint getPreviousIndex(){ Eh;Ia6}
int previousIndex = getStartIndex() - Gi-pi=#&cs
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pageSize; 5P #._Em
if(previousIndex < 0) T_2'=7
return0; 3(J>aQZuI
else uY)4y0
return previousIndex; yx`@f8Kr
} ='D%c^;O8'
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} gNxv.6Pp=
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抽象业务类 SE(<(w
java代码: *IbDA
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/** 2u_=i$xW
* Created on 2005-7-12 gYbvCs8O!
*/ wT+60X'
package com.javaeye.common.business; YhglL!pC
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import java.io.Serializable; *g}==o`
import java.util.List; Z\C"/j<y
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import org.hibernate.Criteria; jN{k }
import org.hibernate.HibernateException; i:
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import org.hibernate.Session; 7ojh=imY
import org.hibernate.criterion.DetachedCriteria; qDswFs(
import org.hibernate.criterion.Projections; !-qk1+<h
import 9{nU\am!\
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org.springframework.orm.hibernate3.HibernateCallback; !V #*(_+n
import ?xKiN5q"6
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org.springframework.orm.hibernate3.support.HibernateDaoS @.cord`
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upport; A<H]uQ>
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import com.javaeye.common.util.PaginationSupport; rA<J^dX=C
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public abstract class AbstractManager extends :W&klUU"
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HibernateDaoSupport { vr47PM2al
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privateboolean cacheQueries = false; vQXF$/S
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privateString queryCacheRegion; ^+~$eg&js
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publicvoid setCacheQueries(boolean uJ=&++[
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cacheQueries){ ;/m>c{
this.cacheQueries = cacheQueries; WR.7%U';
} Zq1> M'V;
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publicvoid setQueryCacheRegion(String ,9=P=JH
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queryCacheRegion){ G@ybx[_[@
this.queryCacheRegion = +A,cdi9z
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queryCacheRegion; %E,-dw
} ;ACeY
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publicvoid save(finalObject entity){ 4byh,t
getHibernateTemplate().save(entity); w\t
} 2s 9U&
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publicvoid persist(finalObject entity){ Jz;`L3m
getHibernateTemplate().save(entity); 0x'Fi2=`
} $3#oA.~R/
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publicvoid update(finalObject entity){ ,,9vk \
getHibernateTemplate().update(entity); %u|Qh/?7
} QIN# \
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publicvoid delete(finalObject entity){ g5Hsz,x
getHibernateTemplate().delete(entity); `~=Is.V[
} ^kB9
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publicObject load(finalClass entity, P#A|Pn<p
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finalSerializable id){ . 55aY~We
return getHibernateTemplate().load Yic'p0<
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(entity, id); AQ.q?'vE)
} 0XIrEwm@%
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publicObject get(finalClass entity, Xw^:<Nx:
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finalSerializable id){ d<;XQ.Wo7
return getHibernateTemplate().get ~>$(5s2
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(entity, id); kS7T'[d
} }>j1j^c1='
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publicList findAll(finalClass entity){ T5U(B3j_
return getHibernateTemplate().find("from H
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" + entity.getName()); {24Pv#ZG#^
} 'Uo:b<
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publicList findByNamedQuery(finalString RzSN,bLR
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namedQuery){ U`'w{~"D%
return getHibernateTemplate :(x 90;DW
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().findByNamedQuery(namedQuery); b}q,cm
} ]zK} X!
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publicList findByNamedQuery(finalString query, L'h'm{i
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finalObject parameter){ 2I39fZa
return getHibernateTemplate Y!s/uvRI
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().findByNamedQuery(query, parameter); &l|B>{4v
} r>q`# ~
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publicList findByNamedQuery(finalString query, J.`.lQ$z
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finalObject[] parameters){ u09OnP\
return getHibernateTemplate ~JT{!wcE}o
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().findByNamedQuery(query, parameters); ;6)|'3.B9
} CnA*o 8w
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publicList find(finalString query){ XJOo.Y
return getHibernateTemplate().find CblL1 q8
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(query); m
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} Ox43(S0~
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publicList find(finalString query, finalObject ;j_#,Da9<
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parameter){ #6m//0 u
return getHibernateTemplate().find C"mb-n7s
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(query, parameter); p0YTZS ]h
} ,>jm|BTD {
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public PaginationSupport findPageByCriteria $fvUb_n
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(final DetachedCriteria detachedCriteria){ YGn:_9
return findPageByCriteria 6ensNr~ea
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); E0h!%/+-L
} kI;^V
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public PaginationSupport findPageByCriteria IH0^*f
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(final DetachedCriteria detachedCriteria, finalint #5I "M WA
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startIndex){ ?^+|V,<
return findPageByCriteria q
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(detachedCriteria, PaginationSupport.PAGESIZE, |Z/ySAFM
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startIndex); UX9o
} nb!m>0*/
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public PaginationSupport findPageByCriteria V7v,)a" L
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(final DetachedCriteria detachedCriteria, finalint wIiT
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pageSize, pV+;/y_
finalint startIndex){ Kj>_XaFCg!
return(PaginationSupport) 8ksDXf`.
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getHibernateTemplate().execute(new HibernateCallback(){ eK@Y] !lz
publicObject doInHibernate p 5'\< gQ
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(Session session)throws HibernateException { Zn!SHj
Criteria criteria = #WG(V%f]
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detachedCriteria.getExecutableCriteria(session); {gn[
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int totalCount = jHZ<Gc
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((Integer) criteria.setProjection(Projections.rowCount _[7uLWyC9
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()).uniqueResult()).intValue(); <Jk|Bmw;
criteria.setProjection i\'N1S<D
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(null); _8>"&1n
List items = w$!n8Aqs
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criteria.setFirstResult(startIndex).setMaxResults "8X+F%
ij),DbWd
(pageSize).list(); G#*;3X$
PaginationSupport ps = ro{MDs
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new PaginationSupport(items, totalCount, pageSize, v]!7=>/2
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startIndex); *$1)&2i
return ps; EKf4f^<
} k4P.}SJ?
}, true); V+q RDQ
} >4E,_ `3N
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public List findAllByCriteria(final !]nCeo
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DetachedCriteria detachedCriteria){ Ww~0k!8,t
return(List) getHibernateTemplate l9h;dI{6
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().execute(new HibernateCallback(){ 7$;$4.'
publicObject doInHibernate G!IQ<FuY
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(Session session)throws HibernateException { #@fypCc
Criteria criteria = 2^aTW`>L
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detachedCriteria.getExecutableCriteria(session); BSY#xe V
return criteria.list(); m @%|Q;
} wMoAvA_oS
}, true); @!da1jN
} +9J>'oe'D
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public int getCountByCriteria(final >>r:L3 <!
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DetachedCriteria detachedCriteria){ P.:T
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Integer count = (Integer) 6>I.*Qt \l
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getHibernateTemplate().execute(new HibernateCallback(){ NsHveOK1.
publicObject doInHibernate QFYy$T+W
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(Session session)throws HibernateException { oX~CTunP
Criteria criteria = wW4S@m
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detachedCriteria.getExecutableCriteria(session); 1^3#3duV
return 2cg z
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criteria.setProjection(Projections.rowCount Mm!saKT%
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()).uniqueResult(); as4NvZ@+r
} F?kVW[h?q
}, true); @El<"\
return count.intValue(); *@nUas2"
} Ev16xL8B
} wrU[#g,uvr
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用户在web层构造查询条件detachedCriteria,和可选的 z
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 v"+EBfx
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PaginationSupport的实例ps。 v_0!uT5~NE
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ps.getItems()得到已分页好的结果集 k Dt)S$N4n
ps.getIndexes()得到分页索引的数组 MavO`m&Cg
ps.getTotalCount()得到总结果数 (SK5pU
ps.getStartIndex()当前分页索引 rUjr'O0
ps.getNextIndex()下一页索引 Pa +BE[z
ps.getPreviousIndex()上一页索引 ,m,vo_Ub
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 nif'l/@"
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 9lCKz
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一下代码重构了。 RzQS@^u*F0
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我把原本我的做法也提供出来供大家讨论吧: em}Qv3*#
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首先,为了实现分页查询,我封装了一个Page类: &NeYKh?
java代码: 0pa^O$?p
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/*Created on 2005-4-14*/ ~+yo;[1Yc
package org.flyware.util.page; :j<JZs>`R
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/** 0\@|M @X=
* @author Joa C/Bx_j((
* ?
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*/ ZS]f+}0/}
publicclass Page { `r(J6,O
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/** imply if the page has previous page */ P'9io!Z-s
privateboolean hasPrePage; WI_mJ/2
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/** imply if the page has next page */
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privateboolean hasNextPage; , vyx`wDd
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/** the number of every page */ 4ZpF1Zc4B
privateint everyPage; 5O
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/** the total page number */ C&N4<2b
privateint totalPage; g8A{aHb1}
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/** the number of current page */ u#k,G`
privateint currentPage; AiK4t-
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/** the begin index of the records by the current | V,jd
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query */ [(EH
privateint beginIndex; 9= $,] M
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/** The default constructor */ |S`yXsg
public Page(){ 'xoE
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} ?9@Af{b t2
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/** construct the page by everyPage {<[tYZmj.
* @param everyPage b:cK >fh0_
* */ ~{Rt4o _W
public Page(int everyPage){ KVpAV$|e
this.everyPage = everyPage; f?^Oy!1]
} y"p-8RVk{
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/** The whole constructor */ JO{-
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public Page(boolean hasPrePage, boolean hasNextPage, X]U"ru{1q
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}.V0SM6
int everyPage, int totalPage, >@"3Q`
int currentPage, int beginIndex){ IYg3ve`x
this.hasPrePage = hasPrePage; Y_>-p(IH
this.hasNextPage = hasNextPage; @^6OV)
this.everyPage = everyPage; U{uWk3I_b
this.totalPage = totalPage; Qwo9>ClC
this.currentPage = currentPage; wDMB
this.beginIndex = beginIndex; 4m[C-NB!g
} cW\Y?x
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/** ::Q);
* @return G|oB'~{&
* Returns the beginIndex. &\lS
*/ [piF MxZP
publicint getBeginIndex(){ hIo S#]
return beginIndex; ^npS==Y]!.
} :F
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/** V -4*nV
* @param beginIndex pMZf!&tM
* The beginIndex to set. :Z]hI+7
*/ ~7 L)n
publicvoid setBeginIndex(int beginIndex){ UEQ'D9
this.beginIndex = beginIndex; 1L=Qg4 H
} LO} :Ub
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&
/** mImbS)V
* @return ?"<r9S|[O
* Returns the currentPage. y_4krY|Zx
*/ 2|H91Y2
publicint getCurrentPage(){ 9eN2)a/
return currentPage; VO;UV$$
} | ]!Ky[P
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/** R{xyme@"^
* @param currentPage 7}tZ?vD
* The currentPage to set. ZR-s{2sl
*/ &G@-yQ
publicvoid setCurrentPage(int currentPage){ Kg TGxCH
this.currentPage = currentPage; *[1u[H9Cv
} A;WwS?fyQ
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/**
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* @return e(; `9T
* Returns the everyPage. 'UvS3]bSYW
*/ @wdB%
publicint getEveryPage(){ qzlMn)e
return everyPage; :CkR4J!m3
} o=RqegL
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/** 1S[5#ewB;j
* @param everyPage ^'u;e(AaE
* The everyPage to set. t3#H@0<
*/ 'f?&EsIV?
publicvoid setEveryPage(int everyPage){ eFj6p<
this.everyPage = everyPage; _z(5e
} Ad`[Rt']kI
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/** rv%ye
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* @return x#j\"$dla
* Returns the hasNextPage. e9Ul A
*/ Il^\3T+
publicboolean getHasNextPage(){ BvZ^^IUb
return hasNextPage; <`p75B
} APtselC
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/** ueE?"Hk
* @param hasNextPage 4/`h@]8P
* The hasNextPage to set. A M1C
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*/ {r].SrW9s9
publicvoid setHasNextPage(boolean hasNextPage){ `J=1&ae