Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 @o`sf-8x
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Ny[QT*nV
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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 hl`u"?rg
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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 S3ErH,XB.
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分页支持类: Ys-^7
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java代码: [@ILc*2O
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package com.javaeye.common.util; 'gYg~=
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import java.util.List;
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publicclass PaginationSupport { 2H6:np|O
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publicfinalstaticint PAGESIZE = 30; N=q#y@ L
{ E^U6@
privateint pageSize = PAGESIZE; Mw+v"l&mU
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privateList items; 2R\+}
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privateint totalCount; hzv3F9.x
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privateint[] indexes = newint[0]; hzq5![/sV
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privateint startIndex = 0; },&h[\N{6
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public PaginationSupport(List items, int ;>8kPG
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totalCount){ Yc|uD-y
setPageSize(PAGESIZE); g
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setTotalCount(totalCount); g>_OuQ|c
setItems(items); 5?w.rcN[j
setStartIndex(0); S!`:E
} Z&-tMai;
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public PaginationSupport(List items, int R#ya,L
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totalCount, int startIndex){ "oe!M'aj`1
setPageSize(PAGESIZE); _KN:
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setTotalCount(totalCount); yyjw?#\8
setItems(items); jQ|:I7y
setStartIndex(startIndex); }3J=DCtS
} 4vLw?_".
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public PaginationSupport(List items, int t0.;nv@A0
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totalCount, int pageSize, int startIndex){ >azEed<B
setPageSize(pageSize); Gc'M[9Mh
setTotalCount(totalCount); -=a[J;'q
setItems(items); 2T?TM! \Q
setStartIndex(startIndex); z&F5mp@
} 7h`^N5H.q
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publicList getItems(){ 'g hys1H
return items; G|*G9nQ
} q/x/N5HU
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publicvoid setItems(List items){ |z*>ixK
this.items = items; j8a[
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} c0ZaFJ
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publicint getPageSize(){ En\Z#0,V
return pageSize; ~b6GrY"vB
} hl]S'yr
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publicvoid setPageSize(int pageSize){ ;A"\?i Q
this.pageSize = pageSize; jT-<IJh!o
} X!c?CL
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publicint getTotalCount(){ * |KVN
return totalCount; )4m_Ap\
} ~},W8\C>
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publicvoid setTotalCount(int totalCount){ n[CoS
if(totalCount > 0){ niz 'b]] +
this.totalCount = totalCount; #xp(B5
int count = totalCount / Mk5RHDh
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pageSize; FmD +8=
if(totalCount % pageSize > 0) 1tGgDbJU
count++; MGaiTN^_<
indexes = newint[count]; 0OWL
for(int i = 0; i < count; i++){ C:j]43`
indexes = pageSize * ArXl=s';s4
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i; 5@f5S0 Y
} X"<|Z]w
}else{ m&/=&S
this.totalCount = 0; X-/Ban
} a+
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} Qxq-Mpx{
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publicint[] getIndexes(){ zy>}L #
return indexes; @i1q]0
} 1<,/
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publicvoid setIndexes(int[] indexes){ *eGM7o*\X
this.indexes = indexes; h(N=V|0
} Y/lN@
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publicint getStartIndex(){ ,8##OB(
return startIndex; F,pCR7o>
} '9q6aM/&
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publicvoid setStartIndex(int startIndex){ i@,]Z~]
if(totalCount <= 0) HJ@5B"
this.startIndex = 0; ])N%^Qe$U
elseif(startIndex >= totalCount) =DMbz`t
this.startIndex = indexes ik\S88|
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[indexes.length - 1]; Kz[BB@[
elseif(startIndex < 0) w~N-W8xNR
this.startIndex = 0; [hHG.
else{ x+:zq<0|
this.startIndex = indexes aU(tu2
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[startIndex / pageSize]; 2 ~-( A
} aQ|hi F}
} /b{HG7i\
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publicint getNextIndex(){ .Dx2 ;lj
int nextIndex = getStartIndex() + euZI`*0
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pageSize; &t6Tcy
if(nextIndex >= totalCount) x6e +7"#~
return getStartIndex(); rPO}6lsc
else `bqzg
return nextIndex; %3G;r\|r]
} ,q</@}.\wN
)
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publicint getPreviousIndex(){ (\&
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int previousIndex = getStartIndex() - m6MaX}&zv
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pageSize; \ V?I+Gc
if(previousIndex < 0) xwOE+
return0; FL&dv
else 0jTMZ<&zZ
return previousIndex; `M]BhW)
} Cuv|6t75'
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} 4)nt$fW
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抽象业务类 ~`[8"YUL
java代码: (&c,twa~
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/** '!@A}&]
* Created on 2005-7-12 ?i%nMlcc
*/ a7*COh
package com.javaeye.common.business; @,Jb7V<
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import java.io.Serializable; u\3ZIb
import java.util.List; .hne)K%={y
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import org.hibernate.Criteria; g]4yAV<2
import org.hibernate.HibernateException; 2Pz 5f
import org.hibernate.Session; Om6Mmoqh
import org.hibernate.criterion.DetachedCriteria; zzE]M}s
import org.hibernate.criterion.Projections; WL/5 oj
import z}3di5+P
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org.springframework.orm.hibernate3.HibernateCallback; Y{j7Q4{
import "$P'Wv
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org.springframework.orm.hibernate3.support.HibernateDaoS V8T#NJ
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upport; $>![wZ3
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import com.javaeye.common.util.PaginationSupport; X98#QR#m
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public abstract class AbstractManager extends ^vG=|X|)c
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HibernateDaoSupport { XJ O[[G`
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privateboolean cacheQueries = false; 7|{ B#
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privateString queryCacheRegion; "&Gw1.p
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publicvoid setCacheQueries(boolean X0!Bs-WFp
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cacheQueries){ 2'Y{FY_Z
this.cacheQueries = cacheQueries; dK`(BA{`3
} m[W/j/$A+x
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publicvoid setQueryCacheRegion(String aDN.gMS
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queryCacheRegion){ 3`xsK[
this.queryCacheRegion = ^] i"
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queryCacheRegion; 5`{=`
} J}:&eS
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publicvoid save(finalObject entity){ VZHr-z$6n
getHibernateTemplate().save(entity); Qg[heND
} (x}A_i
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publicvoid persist(finalObject entity){ ) sRN!~
getHibernateTemplate().save(entity); uW )
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} PBCb0[\
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publicvoid update(finalObject entity){ =Y/}b\9`T
getHibernateTemplate().update(entity); 3\,MsoAl
} E1#H{)G
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publicvoid delete(finalObject entity){ Rq"VB.ef&{
getHibernateTemplate().delete(entity); [?A&xqO3
} :DDO=
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publicObject load(finalClass entity, p@vpd
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finalSerializable id){ L7X7Zt8%
return getHibernateTemplate().load fdN45in=>
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(entity, id); dUI3erO
} C(f$!~M4b
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publicObject get(finalClass entity, 3gC\{y!8
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finalSerializable id){ v hRu`Yb
return getHibernateTemplate().get eH ;Wfs2f
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(entity, id); )ZQHa7V
} d#E(~t(^
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publicList findAll(finalClass entity){ I).=v{@9V<
return getHibernateTemplate().find("from | -JI`!7
c$@`P
" + entity.getName()); yb[{aL^4%
} \El|U#$u'
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publicList findByNamedQuery(finalString X7t5b7
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namedQuery){ E~'q?LJOB
return getHibernateTemplate P
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().findByNamedQuery(namedQuery); Mr$# e
} v]B0!k&4.
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\[{}}
publicList findByNamedQuery(finalString query, D."cQ<sxpN
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finalObject parameter){
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return getHibernateTemplate |Dl*w/n
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().findByNamedQuery(query, parameter); 5x:Ift
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} l[tY,Y:4qO
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publicList findByNamedQuery(finalString query, *54>iO-
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finalObject[] parameters){ m-:8jA?
return getHibernateTemplate LEYWH%y
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().findByNamedQuery(query, parameters); s-QM6*
} +AE&GU
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publicList find(finalString query){ ;X?Ah
return getHibernateTemplate().find CBiU#h
q
+ ")qi=
(query); <;2P._oZ
} 1Z^`l6|2
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publicList find(finalString query, finalObject bYwI==3
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parameter){ FK4nz2&4
return getHibernateTemplate().find += |hMQ;
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(query, parameter); .b=M5JsyV
} kx"hWG4
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public PaginationSupport findPageByCriteria Cfv L)f
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(final DetachedCriteria detachedCriteria){ LK'S)Jk
return findPageByCriteria K7t&fDI
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 4A\BGD*5
} @A~B
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public PaginationSupport findPageByCriteria %v?jG(o
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(final DetachedCriteria detachedCriteria, finalint SR&(HH$
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startIndex){ }};j2
return findPageByCriteria J6*\>N5W
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(detachedCriteria, PaginationSupport.PAGESIZE, hj^G}4
>< <$
startIndex); VfL]O 8P>
} 2.fyP"P
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public PaginationSupport findPageByCriteria 8{}Pj
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(final DetachedCriteria detachedCriteria, finalint I3}HNGvU
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pageSize, p=8M0k
finalint startIndex){ [OFTP#}c
return(PaginationSupport) r+{!@`dYi
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getHibernateTemplate().execute(new HibernateCallback(){ m6~ sKJV
publicObject doInHibernate )V[w:= *
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(Session session)throws HibernateException { 7
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Criteria criteria = @!L@UP0
}<5\O*kX4
detachedCriteria.getExecutableCriteria(session); ])Q9=?Sd}
int totalCount = r)9i1rI+
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((Integer) criteria.setProjection(Projections.rowCount bGMeBj"R
N[+o[%A
()).uniqueResult()).intValue(); ~,1-$#R
criteria.setProjection Q8}TNJsU
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(null); )M&Azbu
List items = nK?k<
P\*2c*,W;
criteria.setFirstResult(startIndex).setMaxResults jt'Y(u]2
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(pageSize).list(); 8r`VbgI&
PaginationSupport ps = ((RpT0rP\
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new PaginationSupport(items, totalCount, pageSize, y]E)2:B[d
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startIndex); |(J
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return ps; 0btmao-
} &|'Kut?8
}, true); AXNszS%4
} ;:-2~z~~
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public List findAllByCriteria(final '$kS]U
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DetachedCriteria detachedCriteria){ eBSn1n
return(List) getHibernateTemplate Ol/2%UJXL
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().execute(new HibernateCallback(){ _Sk<S
publicObject doInHibernate +X%fcoc
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(Session session)throws HibernateException { =AnZ>6
Criteria criteria = -?%{A%'
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detachedCriteria.getExecutableCriteria(session); qs8K jG@
return criteria.list(); _,K>u6N&
} !cFE^VM_;
}, true); ?^G$;X7B
} *]>OCGsr
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public int getCountByCriteria(final [r/Seg"
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DetachedCriteria detachedCriteria){ 66"ZH,335
Integer count = (Integer) *{;A\sL
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getHibernateTemplate().execute(new HibernateCallback(){ xt<,
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publicObject doInHibernate ("P mB?20
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(Session session)throws HibernateException { 2Z IpzH/8
Criteria criteria = bcx{_&1p
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detachedCriteria.getExecutableCriteria(session); }~\].I6
return [%)B%h`XGf
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criteria.setProjection(Projections.rowCount e,j ?_p
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()).uniqueResult(); <2@<r
t{
} OTFu4"]M
}, true); 3_1Io+uXk
return count.intValue(); :#&U95EC0
} ~3-YxCn%
} WCfe!P?g
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用户在web层构造查询条件detachedCriteria,和可选的 iN9!?Ov_
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 my\oC^/9
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PaginationSupport的实例ps。 kA:;c}p
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ps.getItems()得到已分页好的结果集 OFAqP1o{$
ps.getIndexes()得到分页索引的数组 Ug'nr
ps.getTotalCount()得到总结果数 tIy/QN_42
ps.getStartIndex()当前分页索引 o >4>7
ps.getNextIndex()下一页索引 :)V0zHo&(
ps.getPreviousIndex()上一页索引 ^fiRRFr[
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 J1ro\"
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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 4Jy,IKPp
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一下代码重构了。 j\L$dPZ
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我把原本我的做法也提供出来供大家讨论吧: 9d(v^T
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首先,为了实现分页查询,我封装了一个Page类: w]YyU5rhS
java代码: ^aM/BS\
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/*Created on 2005-4-14*/ K>JU/(
package org.flyware.util.page; DmA!+
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/** 5:3$VWLa
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* @author Joa soK_l|z:J
* {"AYOc>2|
*/ g#nsA(_L
publicclass Page { Y$5v3E\uc
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/** imply if the page has previous page */ 3>3ZfFC
privateboolean hasPrePage; t7%Bv+Uo
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/** imply if the page has next page */ T $]L 5
privateboolean hasNextPage; w|*G`~l09
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/** the number of every page */ }j@@
privateint everyPage; (MU7
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/** the total page number */ T1
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privateint totalPage; lFt{:HfX-
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/** the number of current page */ UsKn4Kh
privateint currentPage; hpKc_|un
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/** the begin index of the records by the current O@&I.d$
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query */ [NDYJ'VGe
privateint beginIndex; P?ol]MwaB
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/** The default constructor */ 2xm?,p`
public Page(){ 'v)+S;oB
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} 2Rt ZTn
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/** construct the page by everyPage +T;qvx6
* @param everyPage f
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* */ ew~FN
public Page(int everyPage){ (acRYv(
this.everyPage = everyPage; ^ZBkt7
} >qZRIDE5$
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/** The whole constructor */ (P_+m#
public Page(boolean hasPrePage, boolean hasNextPage, 2AE|N_v8W
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int everyPage, int totalPage, Xb;`WE gC
int currentPage, int beginIndex){ o4795r,jz
this.hasPrePage = hasPrePage; QY!A[!6h
this.hasNextPage = hasNextPage; 1 Qkuxw
this.everyPage = everyPage; ymqhI\>y#
this.totalPage = totalPage; (ZJ_&8C#
this.currentPage = currentPage; g9.hR8X
this.beginIndex = beginIndex; N/p_6GYMa
} 3M`J.>
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/** 0U~JSmj:2K
* @return J0o[WD$Ax
* Returns the beginIndex. )nV x 2m4
*/ )/w2]d/9
publicint getBeginIndex(){ =#Jb9=zdR
return beginIndex; Po[zzj>m
} R/7l2 *
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/** <z PyID`
* @param beginIndex z'*>Tk8h
* The beginIndex to set. ;!b(b%
*/ wz57.e!Me=
publicvoid setBeginIndex(int beginIndex){ 9`{cX
this.beginIndex = beginIndex; LgYzGlJp
} Ar_/9@n
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/** 'tj4 ;+xf^
* @return dEnhNPeRl
* Returns the currentPage. ZBWe,Xvq
*/ xYq8\9Qb
publicint getCurrentPage(){ <dZ{E7l
return currentPage; !.A>)+AK
} PsVA>Q,4!.
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/** a &j?"o
* @param currentPage 1*"Uc!7.%
* The currentPage to set. A{k@V!A%
*/ <f%9w]
publicvoid setCurrentPage(int currentPage){ \`^jl
this.currentPage = currentPage; E*$:~w
} c}lgWu~
;-F#a+2]!
/** -llujB%;,e
* @return oT'XcMn
* Returns the everyPage. Us<lWEX;k
*/ >;Bhl|r~z
publicint getEveryPage(){ TFhj]r^{
return everyPage; b({2|R
} ?{n#j,v!
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/** F^f]*MhT"
* @param everyPage
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* The everyPage to set. DmYm~hzJ
*/ j(SQNSFD
publicvoid setEveryPage(int everyPage){
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this.everyPage = everyPage; W*)>Tr)o
} %+.]>''a
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/** F-nt7l
* @return 1_'ZbZv4h
* Returns the hasNextPage. 3ySnA AG
*/ >TE&myZ?*
publicboolean getHasNextPage(){ NO&OuiN
return hasNextPage; -vMP{,
} Og["X0j
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/** o)$sZ{` ="
* @param hasNextPage ,UP6.C14
* The hasNextPage to set. jq[>PvR
*/ `s+qz
publicvoid setHasNextPage(boolean hasNextPage){ 2`z+_DA
this.hasNextPage = hasNextPage; oxRu:+N
} Y3thW@mD05
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/** l6O2B/2j
* @return %VdJ<=@
* Returns the hasPrePage. m?csake.Me
*/ Z/0M9 Q%
publicboolean getHasPrePage(){ f_
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return hasPrePage; F2u{Wzr_@
} !,\]> c
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/** qn<~
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* @param hasPrePage V7&