Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ^2Fs)19R
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 _x,-d|9bd
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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 Up!ZCZ$RC
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 vP87{J*DE1
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分页支持类: d<|lLNS
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java代码: "M5ro$qZ}
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package com.javaeye.common.util; NZ%~n:/V#
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import java.util.List; "[".3V
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publicclass PaginationSupport { eN2k8=
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publicfinalstaticint PAGESIZE = 30; dPyBY]`
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privateint pageSize = PAGESIZE; ~D`oP/6
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privateList items; asmW
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privateint totalCount; ad3z]dUZ9
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privateint[] indexes = newint[0]; +k(3+b$S-
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privateint startIndex = 0; EB3o8
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public PaginationSupport(List items, int /Y\E68_Fh
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totalCount){ Zh~Lm
setPageSize(PAGESIZE); I}G}+0geV
setTotalCount(totalCount); VqO<+~M,E
setItems(items); :'=~/GR
setStartIndex(0); d;jJe0pH
} Bg+]_:<U
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public PaginationSupport(List items, int J%O4IcE
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totalCount, int startIndex){ 7^t(RNq
setPageSize(PAGESIZE); A@
setTotalCount(totalCount); cT=wJ
setItems(items); cmGj0YUQ1
setStartIndex(startIndex); M_.,c Vk
} ao";5m
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public PaginationSupport(List items, int 3_eml\CY
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totalCount, int pageSize, int startIndex){ *ZSp9g"Z
setPageSize(pageSize); (h>X:!
setTotalCount(totalCount); )6R#k8'ERr
setItems(items); Y /ac}q
setStartIndex(startIndex); D15u1A
} Lv5
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publicList getItems(){ 46?F+,Rzl
return items; Lvj5<4h;
} Q3O .<9S
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publicvoid setItems(List items){ *I1W+W`G
this.items = items; wrb& ta
} Qx,$)|_
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publicint getPageSize(){ I7z]%Z
return pageSize; v0MOX>`s
} Am?Hkh2
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publicvoid setPageSize(int pageSize){ I~]mX;
this.pageSize = pageSize; rn5g+%jX*
} bq&S?! =s
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publicint getTotalCount(){ 8\.1m9&r>o
return totalCount; XQY&4tK
} Jx>B %vZ\
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publicvoid setTotalCount(int totalCount){ pBnf^Ew1
if(totalCount > 0){ iai4$Y(%
this.totalCount = totalCount; C<@1H>S4_
int count = totalCount / x)wt.T?eL
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pageSize; KeHE\Fq^V
if(totalCount % pageSize > 0) m"7 R
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count++; $H@)hY8wA
indexes = newint[count]; vG_v89t!ex
for(int i = 0; i < count; i++){ O*/-I
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indexes = pageSize * KdMA58)
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i; 7Z~szD
} +Y]*>afG
}else{ 5{/Pn%5
this.totalCount = 0; `b`52b\6S
} [%,=0P}
} skx=w<YO6]
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publicint[] getIndexes(){ wvaIgy%z
return indexes; 54cgX)E[x
} d4h(F,K7V
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publicvoid setIndexes(int[] indexes){ |=}~>!!
this.indexes = indexes; (ai-n,y
} "<$vU_
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publicint getStartIndex(){ RW[<e
return startIndex; $<e .]`R
} JU1; /3(
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publicvoid setStartIndex(int startIndex){ KBHKcFk
if(totalCount <= 0) 7{F9b0zwk
this.startIndex = 0; 9+Bq00-Z$
elseif(startIndex >= totalCount) 3CuoBb8
this.startIndex = indexes sZBO_](S
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[indexes.length - 1]; }eFUw
elseif(startIndex < 0) Dx*oSP.qX
this.startIndex = 0; s\FNKWQ
else{ sl O9H6<
this.startIndex = indexes ms<u YLp
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[startIndex / pageSize]; .T wF]v
} 8&hn$~ate
} 5MU@g*gj,C
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publicint getNextIndex(){ jAHn`Bxz
int nextIndex = getStartIndex() + Eakjsk
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pageSize; zb,`K*Z{
if(nextIndex >= totalCount) D I[^H
return getStartIndex(); vg1s5Yqk
else "fd=(&
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return nextIndex; #|E. y^IC
} pvxqeC9`
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publicint getPreviousIndex(){ RW8u0 ?b
int previousIndex = getStartIndex() - |noTIAI
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pageSize; "z4E|s
if(previousIndex < 0) ED&KJnquWJ
return0; uW_ /7ex
else 9 NSYrIQ"
return previousIndex; n :kxG
} -ouL4
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} ,1h(k<-
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抽象业务类 kIo?<=F8T
java代码: $R36`wk
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/** f2f$aZ
* Created on 2005-7-12 ]^%3Y
*/ K2v)"|T)
package com.javaeye.common.business; U?yXTMD
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import java.io.Serializable; +O6@)?pI
import java.util.List; ga%77t|jm3
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import org.hibernate.Criteria; oWOZ0]H1
import org.hibernate.HibernateException; UQr+\ u
import org.hibernate.Session; %)]RM/e8
import org.hibernate.criterion.DetachedCriteria; ]"_'o~
import org.hibernate.criterion.Projections; L1K_|X
import =z.AQe+
"5bk82."
org.springframework.orm.hibernate3.HibernateCallback; $R4\jIewV
import #xB%v
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org.springframework.orm.hibernate3.support.HibernateDaoS O[5ti=W
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upport; cFQa~
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import com.javaeye.common.util.PaginationSupport; Ho|n\7$
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public abstract class AbstractManager extends Joj8'
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HibernateDaoSupport { (re D
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privateboolean cacheQueries = false; 8%B @[YDe
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privateString queryCacheRegion; L3\{{QOA
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publicvoid setCacheQueries(boolean lQjq6Fl2
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cacheQueries){ up?8Pq*
this.cacheQueries = cacheQueries; WMg^W(
} (;3jmdJhK
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publicvoid setQueryCacheRegion(String umeb&\:8S-
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queryCacheRegion){ &r_B\j3
this.queryCacheRegion = tz{]H9
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queryCacheRegion; i%iU_`
} K!X8KPo
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publicvoid save(finalObject entity){ f$L5=V
getHibernateTemplate().save(entity); zc"eSy< w$
} |V&k1{V
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publicvoid persist(finalObject entity){ T+fU+GLD
getHibernateTemplate().save(entity); aw`mB,5U
} 8b/yT4f
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publicvoid update(finalObject entity){ |v+b?@
getHibernateTemplate().update(entity); H>B:jJf
} Kh> ^;`h
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publicvoid delete(finalObject entity){ TBpW/wz/
getHibernateTemplate().delete(entity); *\>7@r[%5
} vgV0a{u"
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publicObject load(finalClass entity, 2Y,s58F
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finalSerializable id){ {974m` 5
return getHibernateTemplate().load 4-o$OI>
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(entity, id); ,J[sg7vcv
} &EMm<(.]a
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publicObject get(finalClass entity, 0-@waK
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finalSerializable id){ q>Y_I<;'g
return getHibernateTemplate().get :%Bo)0a9
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(entity, id); u3q!te
} 0Y\u,\GrxW
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publicList findAll(finalClass entity){ 6Cibc.vt
return getHibernateTemplate().find("from
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"k+QDQ3=
" + entity.getName()); 6A%Y/oU+2
} 3vy5JTCz~
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publicList findByNamedQuery(finalString v^e[`]u(
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namedQuery){ ?)9 6YX'
return getHibernateTemplate i22R3&C
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().findByNamedQuery(namedQuery); __zsrIUJ
} PoC24#vS
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publicList findByNamedQuery(finalString query, YyI|^f8C
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finalObject parameter){ KxY|:-"Tt
return getHibernateTemplate 7m1*Q@D
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().findByNamedQuery(query, parameter); ^E5Xpza
} }=wSfr9g
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publicList findByNamedQuery(finalString query, ?Hq`*I?b9
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finalObject[] parameters){ !I:6L7HdwB
return getHibernateTemplate ]Qj65]
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().findByNamedQuery(query, parameters); @T1-0!TM')
} F> ..eK
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publicList find(finalString query){ S0\:1B
return getHibernateTemplate().find o6'`W2P
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(query); x_#yH3kJ
} pp/Cn4"w
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publicList find(finalString query, finalObject )KkA<O}f
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parameter){ W)o-aX!P
return getHibernateTemplate().find ,>e)8
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(query, parameter); <.~j:GbsE
} /Eu[7
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public PaginationSupport findPageByCriteria ix,5-j
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(final DetachedCriteria detachedCriteria){ 1NA>W
return findPageByCriteria t4
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); >|mmJ4T
} k(!#^Mlz[
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public PaginationSupport findPageByCriteria -g_PJ.Hk
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(final DetachedCriteria detachedCriteria, finalint rWAJL9M
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startIndex){ Dtt[a
return findPageByCriteria m'@NF--#Oq
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(detachedCriteria, PaginationSupport.PAGESIZE, d%\en&:la
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startIndex); =X]$J@j
} Q3'\Vj,S&
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public PaginationSupport findPageByCriteria zHeqV
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(final DetachedCriteria detachedCriteria, finalint rK9X68)
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pageSize, ~f;d3dJ]/
finalint startIndex){ P0Z1cN}
return(PaginationSupport) 7`thM/fN
@OV\raUO&V
getHibernateTemplate().execute(new HibernateCallback(){ LSs!U
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publicObject doInHibernate ]KBzuz%
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(Session session)throws HibernateException { !/[/w39D0o
Criteria criteria = ]*'V#;s
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detachedCriteria.getExecutableCriteria(session); }YfM<
int totalCount = |W[BqQIf
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((Integer) criteria.setProjection(Projections.rowCount {R5Q{]dK3
]k-<[Z;I,
()).uniqueResult()).intValue(); Y&6vTU
criteria.setProjection Y_ b;1RN
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(null); @zSI@Oq_
List items = IxNY%&* `
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criteria.setFirstResult(startIndex).setMaxResults Ztu _UlGC
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(pageSize).list(); sN]O]qYXJ
PaginationSupport ps = ckY,6e"6
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new PaginationSupport(items, totalCount, pageSize, $iu{u|VSu
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startIndex); A2LqBirkl
return ps; r\-Mj\$-
} 2mg4*Ys
}, true); {y-7xg~}
} G9"2h
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public List findAllByCriteria(final l?F-w;wHN
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DetachedCriteria detachedCriteria){ %<8@NbF
return(List) getHibernateTemplate o_C
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().execute(new HibernateCallback(){ *ElR
publicObject doInHibernate ug47JW
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(Session session)throws HibernateException { zOO:`^ m
Criteria criteria = >5G2!Ns'
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detachedCriteria.getExecutableCriteria(session); '!Gnr[aR
return criteria.list(); $$QbcnOf$
} woIcW
}, true); g!%C_AI
} l{OU\
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public int getCountByCriteria(final E5@U~|V[
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DetachedCriteria detachedCriteria){ A#t#c*
Integer count = (Integer) m<]b]FQ
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getHibernateTemplate().execute(new HibernateCallback(){ P5{|U"Y_
publicObject doInHibernate :$eg{IXC"
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(Session session)throws HibernateException { >(>Fx\z}
Criteria criteria = I[b@U<\
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detachedCriteria.getExecutableCriteria(session); h|z{ (v
return F@=)jrO=$
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criteria.setProjection(Projections.rowCount f?xc-lX5R
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()).uniqueResult(); ;-Bi~XD
} -26GOS_8z
}, true); !L5[s
return count.intValue(); zD8q(]: A
} P=ARttT`(
} 8p3pw=p
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用户在web层构造查询条件detachedCriteria,和可选的 mRIW9V
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 e%#8]$
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PaginationSupport的实例ps。 [[fhfV+H
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ps.getItems()得到已分页好的结果集 /mST<{(_G\
ps.getIndexes()得到分页索引的数组 ]@@3]
ps.getTotalCount()得到总结果数 T""y)%
ps.getStartIndex()当前分页索引 <{\UE~
ps.getNextIndex()下一页索引 ]sz3:p=5
ps.getPreviousIndex()上一页索引 HRF4
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 *GsrG*OM*D
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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 G7lC'~}
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一下代码重构了。 1KxtHLLU
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我把原本我的做法也提供出来供大家讨论吧: ~g2ColFhu
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首先,为了实现分页查询,我封装了一个Page类: &Vi"m!Bf
java代码: D]+tr%
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/*Created on 2005-4-14*/ i3k ',8
package org.flyware.util.page; YW"?Fy
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/** $UlA_l29
* @author Joa f f"Clp
* 6.tppAO+
*/ 5v8&C2Jy@
publicclass Page { LV=!nF0
>*A\/Da]j
/** imply if the page has previous page */ ,2?"W8,
privateboolean hasPrePage; *>.~f<V
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/** imply if the page has next page */ %@(6,^3%i
privateboolean hasNextPage; \@4QG.3&
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/** the number of every page */ ,K7C2PV6
privateint everyPage; Bd m<<<
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/** the total page number */ 0t7yK
privateint totalPage; I_xJ[ALdm
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/** the number of current page */ vzaxi;S<
privateint currentPage; DC*|tHl
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/** the begin index of the records by the current T4Z("
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query */ TO[5h Y\
privateint beginIndex; "DWw1{ 5/
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/** The default constructor */ @]*z!>1
public Page(){ oG@P M+{
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} bz H5Lc {%
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/** construct the page by everyPage !l6B_[!@
* @param everyPage \ox:/-[c\<
* */ lW&glU(
public Page(int everyPage){ E_?3<)l)RI
this.everyPage = everyPage; #_7}O0?c3
} RWA|%/L
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/** The whole constructor */ {br4B7b
public Page(boolean hasPrePage, boolean hasNextPage, Mw'd<{
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int everyPage, int totalPage, $BH0W{S
int currentPage, int beginIndex){ FG#E?G
this.hasPrePage = hasPrePage; W,Dr2$V
this.hasNextPage = hasNextPage; _Zf1=&U#/
this.everyPage = everyPage; ^r;}6
this.totalPage = totalPage; [+GQ3Z\
this.currentPage = currentPage; S2jo@bp!
this.beginIndex = beginIndex; by6E
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} X[;4.imE
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/** >>^c_ 0"O
* @return "{{xH*ij'
* Returns the beginIndex. DU1,i&(
*/ 103^\Av8
publicint getBeginIndex(){ I8^z\ef&
return beginIndex; sMO3eNLn
} ]s,T`
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}
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/** }3[ [ONA
* @param beginIndex "t_] Qu6
* The beginIndex to set. 5&