Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 yXR$MT+ ~
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 kVy%y"/
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 C:l
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 9'\18_w
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分页支持类: :JxShF:M
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java代码: "S_t%m&R
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package com.javaeye.common.util; 2"c$#N
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import java.util.List; 37 T<LU
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publicclass PaginationSupport { 2} /Z.)^Q
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publicfinalstaticint PAGESIZE = 30; b{b2L.
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privateint pageSize = PAGESIZE; tl
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privateList items; Ky8sLm@
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privateint totalCount; ^j0Mu.+_
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privateint[] indexes = newint[0]; 8G6PcTqv"
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privateint startIndex = 0; }f+If{
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public PaginationSupport(List items, int Tu?+pz`h
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totalCount){ 4askQV &hj
setPageSize(PAGESIZE); (Ub=sC
setTotalCount(totalCount); `|XE B
setItems(items); _[<R<&jG
setStartIndex(0); ra0:Lg'
} &BY%<h0c
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public PaginationSupport(List items, int AE={P*g
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totalCount, int startIndex){ h3Nwxj~E
setPageSize(PAGESIZE); J}c57$Z
setTotalCount(totalCount); 1XSA3;ZEc
setItems(items); XZ EawJ0
setStartIndex(startIndex); z\Rs?v"
} AjKP -[
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public PaginationSupport(List items, int @zL)R b%P$
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totalCount, int pageSize, int startIndex){ ^VK-[Sz&
setPageSize(pageSize); d rnqX-E;
setTotalCount(totalCount); -wH#B<'
setItems(items); kT&-:: ^R
setStartIndex(startIndex); >6*"g{/
} X6kB
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publicList getItems(){ }__g\?Yf
return items; 'YIFHn$!
} hb9e6Cc
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publicvoid setItems(List items){ 6F6[w?
this.items = items; F1JSf&8
} r(h&=&T6
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publicint getPageSize(){ |RDmY!9&
return pageSize; )z&0 g2Am
} ] e!CH
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publicvoid setPageSize(int pageSize){ I<e[/#5P\`
this.pageSize = pageSize; 5!$m3j_,]?
} Sj]k5(&
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publicint getTotalCount(){ *vc=>AEc
return totalCount; 0,)B~|+
} |:$D[=
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publicvoid setTotalCount(int totalCount){ A`v (hBM
if(totalCount > 0){ TC[_Ip&
this.totalCount = totalCount; E/|]xKG
int count = totalCount / Zx,R6@l
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pageSize; k@JDG]R<{
if(totalCount % pageSize > 0) &,4]XT
count++; 5W"nn
indexes = newint[count]; oJe9H <
for(int i = 0; i < count; i++){ )W95)]
indexes = pageSize * }^Be^a<ub
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} ^ j;HYs_
}else{ :VP4|H#SP
this.totalCount = 0; WLW'.
} CZRrb 84
} n"vl%!B
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publicint[] getIndexes(){ ljVtFm<
return indexes; 8*kZ.-T
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} *6^|i}
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publicvoid setIndexes(int[] indexes){ r`XIn#o
this.indexes = indexes; jT"P$0sJAd
} 'Bb]<L`
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publicint getStartIndex(){ r/1:!Vu(
return startIndex; A`<#}~A
} Cj%SW <v|
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publicvoid setStartIndex(int startIndex){ 7Ipt~K}
if(totalCount <= 0) /]"&E"X"
this.startIndex = 0; F{)YdqQ
elseif(startIndex >= totalCount) C-d|;R}Ww
this.startIndex = indexes LSb3w/3M
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[indexes.length - 1]; r_p9YS@I
elseif(startIndex < 0) 21D4O,yCe
this.startIndex = 0; c_c]0Tm
else{ JPfNf3<@My
this.startIndex = indexes Ze~$by|9f
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[startIndex / pageSize]; "6_#APoP
} .z&V!2zp
} q"ba~@<BEl
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publicint getNextIndex(){ 5r"BavA
int nextIndex = getStartIndex() + {dvrj<?
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pageSize; W7.O(s,32
if(nextIndex >= totalCount) )bRe"jxn7
return getStartIndex(); !3U1HS-i62
else LqIMU4Ex
return nextIndex; d,[.=Jqv[
} H6E@C}cyM
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publicint getPreviousIndex(){ *-$u\?$
int previousIndex = getStartIndex() - u^a\02aV[
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pageSize; G~_5E]8
if(previousIndex < 0) IrQ8t!
return0; :,rD5aOQ
else 7Z5,(dH>
return previousIndex; Gir_.yc/
} y@]4xLB]
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} o_/C9[:
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抽象业务类 D *W+0
java代码: 8~RUYsg
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/** ;d G.oUk=
* Created on 2005-7-12 +5Ir=]=T9
*/ Hf+A52lrf
package com.javaeye.common.business; jjBcoQU$o
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import java.io.Serializable; OP
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import java.util.List; @dX0gHU[c
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import org.hibernate.Criteria; . hHt+
import org.hibernate.HibernateException; j)Kk:BFFY
import org.hibernate.Session; <kn#`w1U'
import org.hibernate.criterion.DetachedCriteria; \sHM[nF0
import org.hibernate.criterion.Projections; As@~%0 S
import !Y=s_)X
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org.springframework.orm.hibernate3.HibernateCallback; FePJ8
import Fdd$Bl.&XS
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org.springframework.orm.hibernate3.support.HibernateDaoS z QoMHFL3
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upport; ,8o]XFOr
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import com.javaeye.common.util.PaginationSupport; ",E6)r
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public abstract class AbstractManager extends d(,-13
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HibernateDaoSupport { /.'1i4Xa1P
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privateboolean cacheQueries = false; .)|jBC8|}
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privateString queryCacheRegion; %'\D_W&
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publicvoid setCacheQueries(boolean mwbkXy;8
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cacheQueries){ }y|%wym
this.cacheQueries = cacheQueries; -2> L*"^
} W$gSpZ_7
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publicvoid setQueryCacheRegion(String RfN5X}&A
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queryCacheRegion){ W7(OrA!
this.queryCacheRegion = Zu%_kpW
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queryCacheRegion; b%$S6.
} e-qr d
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publicvoid save(finalObject entity){ z@~1e]%
getHibernateTemplate().save(entity); xR#hU;E}
} G#dpSNV3|
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publicvoid persist(finalObject entity){ DMf^>{[
getHibernateTemplate().save(entity); ^~BJu#uVyy
} v{% /aw
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publicvoid update(finalObject entity){ WR'A%"qBwi
getHibernateTemplate().update(entity); VKik8)/.
} +\:I3nKs%
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publicvoid delete(finalObject entity){ U#F(#3/
getHibernateTemplate().delete(entity); <5$= Ta
} H>DJ-lG(
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publicObject load(finalClass entity, >F-J}P
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finalSerializable id){ [MiD%FfcNH
return getHibernateTemplate().load RhQOl9
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(entity, id); 1H[lf
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} PTePSj1N
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publicObject get(finalClass entity, H/, tE0ZV
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finalSerializable id){ U-lN_?
return getHibernateTemplate().get U|
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(entity, id); d!gm4hQhl
} oOUVU}H
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publicList findAll(finalClass entity){ 9CN /v
return getHibernateTemplate().find("from r?[mn^Bo 5
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" + entity.getName()); F2:7UNy,
} "QlCcH`g
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publicList findByNamedQuery(finalString \JyWKET::_
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namedQuery){ !t_,x=
return getHibernateTemplate }40/GWp<f
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().findByNamedQuery(namedQuery); =}q4ked/
} ivagS\Q
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publicList findByNamedQuery(finalString query, 7}lZa~/
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finalObject parameter){ IIu3mXAw
return getHibernateTemplate Y^!40XjrD
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().findByNamedQuery(query, parameter); -e)bq:T
} z44uhR h
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publicList findByNamedQuery(finalString query, _cJ{fYwYU
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finalObject[] parameters){ .o-j
return getHibernateTemplate 05zHL j
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().findByNamedQuery(query, parameters); @t2 Q5c
} K;97/"
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publicList find(finalString query){ y-@!, @e
return getHibernateTemplate().find {xykf7zp
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(query); /~^I]D
} 'wZy: c
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publicList find(finalString query, finalObject %1<p1u'r?#
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parameter){ @uE=)mP@
return getHibernateTemplate().find }?~uAU-
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(query, parameter); 7E5Dz7
} 6P~"7k
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public PaginationSupport findPageByCriteria 'H'+6
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(final DetachedCriteria detachedCriteria){ '-S&i{H
return findPageByCriteria Y1'.m5E
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); /SKr.S61e
} rO`g~>-
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public PaginationSupport findPageByCriteria F^NR qE
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(final DetachedCriteria detachedCriteria, finalint 0V#t ;`Q3
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startIndex){ 1b7xw#gLx
return findPageByCriteria t(Zs*c(
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(detachedCriteria, PaginationSupport.PAGESIZE, XH *tChf<
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startIndex); lp}WB d+
} ^0|NmMJ]
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public PaginationSupport findPageByCriteria U>+~.|'V9
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(final DetachedCriteria detachedCriteria, finalint /8MQqZ C
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pageSize, oyt//SE
finalint startIndex){ !~N4}!X3du
return(PaginationSupport) UBi4 itGD
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getHibernateTemplate().execute(new HibernateCallback(){ {g- DM}q
publicObject doInHibernate J4}\V$ysN
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(Session session)throws HibernateException { YU=ZZEVi
Criteria criteria = .G_3blE;
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detachedCriteria.getExecutableCriteria(session); (`]*Y(/2G
int totalCount =
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((Integer) criteria.setProjection(Projections.rowCount ~{vdP=/WP
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()).uniqueResult()).intValue(); +qj*P9
criteria.setProjection b_jZL'en
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List items = 5g1M_8e'+
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criteria.setFirstResult(startIndex).setMaxResults t/*K#]26
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(pageSize).list(); H@MFj>~
PaginationSupport ps = *fl{Y(_OO
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new PaginationSupport(items, totalCount, pageSize, 0O#B'Uu
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startIndex); _ML~c&9jv
return ps; ~$4.Mf,u
} Ok>(>K<r
}, true); T1QsW<*j
} k&A7alw
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public List findAllByCriteria(final Q*:h/Lhb&
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DetachedCriteria detachedCriteria){ '^Utbp2<
return(List) getHibernateTemplate (~Uel1~@
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().execute(new HibernateCallback(){ Q+d.%qhc
publicObject doInHibernate lU$4NUwM
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(Session session)throws HibernateException { xIQ/$[&v
Criteria criteria = V5O=iMP
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detachedCriteria.getExecutableCriteria(session); yQZ/,KX
return criteria.list(); u`Z0{d
} OK-sT7But
}, true); A~SL5h
} *
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public int getCountByCriteria(final A
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DetachedCriteria detachedCriteria){ n @&"+
Integer count = (Integer) d&|z=%9xl
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getHibernateTemplate().execute(new HibernateCallback(){ Dxt),4%P
publicObject doInHibernate o)%-l4S
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(Session session)throws HibernateException { )sW6iR&_i
Criteria criteria = v/R[?H)
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detachedCriteria.getExecutableCriteria(session); JF~1'"_f:
return t7w-TJvP
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criteria.setProjection(Projections.rowCount YDQ:eebg(
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()).uniqueResult(); TGU:(J'^
} Ap5}5 ewM
}, true); gq'>6vOj
return count.intValue(); 4_PCqEp)
} BBHK
} d_Q*$Iz)3
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用户在web层构造查询条件detachedCriteria,和可选的 {<qF }i:V
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 #6Jc}g<?g
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PaginationSupport的实例ps。 KZ=u54
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ps.getItems()得到已分页好的结果集 3&'2aW
ps.getIndexes()得到分页索引的数组 2w+U$6e C
ps.getTotalCount()得到总结果数 )Im3'0l>
ps.getStartIndex()当前分页索引 NJtQx2Sd'H
ps.getNextIndex()下一页索引 .%=V">R
ps.getPreviousIndex()上一页索引 f-;$0mTQ
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 HPg3`Ul
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 kb71q:[
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一下代码重构了。 <$%X<sDkq
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我把原本我的做法也提供出来供大家讨论吧: r9#
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首先,为了实现分页查询,我封装了一个Page类: rLU'*}
java代码: e,>%Z@92(
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/*Created on 2005-4-14*/ !Uh2}ic
package org.flyware.util.page; A4.4Dji,x
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/** =pcF:D#+
* @author Joa [}OgSP9i
* r> k-KdS
*/ -&|:0#@P
publicclass Page { ]PWDE"
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/** imply if the page has previous page */ <[Q3rJ
privateboolean hasPrePage; \P;rES'
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/** imply if the page has next page */ +x=)/; :
privateboolean hasNextPage; }lP;U$
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/** the number of every page */ Ml?~
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privateint everyPage; eg/<[ A:
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/** the total page number */ 4jNG^@O
privateint totalPage; 26 I
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/** the number of current page */ g13 rx%-
privateint currentPage; c$:1:B9\
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/** the begin index of the records by the current d>0+A)6>
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query */ fX~'Zk\u
privateint beginIndex; vxFTen{-F
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/** The default constructor */ aE"[5*a
public Page(){ m2~