Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 8Z8Y[p
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 (B}+h
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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 fp;a5||5
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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 s
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分页支持类: ChE_unw
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java代码: w}`3 d@
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package com.javaeye.common.util; %VJW@S>j/
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import java.util.List; .
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publicclass PaginationSupport { [cpNiw4e
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publicfinalstaticint PAGESIZE = 30; ~gdd cTp
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privateint pageSize = PAGESIZE; i!,HB|wQ
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privateList items; _B$"e[:yX
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privateint totalCount; .
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privateint[] indexes = newint[0]; '{VM>Q
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privateint startIndex = 0; d+5:Qrr
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public PaginationSupport(List items, int #{,h@g}W
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totalCount){ _]o5R7[MQ
setPageSize(PAGESIZE); rBfg*r`)
setTotalCount(totalCount); GAp!nix6h
setItems(items); \]8i}E1
setStartIndex(0); /^4"Qv\@/
} VQ<5%+
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public PaginationSupport(List items, int qd(hQsfqYU
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totalCount, int startIndex){ yekRwo|
setPageSize(PAGESIZE); ]>8)|]O6n
setTotalCount(totalCount); dtTlIhh1V
setItems(items);
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setStartIndex(startIndex); 3cThu43c
} .Dx2 ;lj
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public PaginationSupport(List items, int T 2|:nC)@
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totalCount, int pageSize, int startIndex){ ^:z7E1~
setPageSize(pageSize); f3&/r
setTotalCount(totalCount); |!Ists
setItems(items); 5f_7&NxT
setStartIndex(startIndex); @vAFfYU9<.
} b n-=fb(
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publicList getItems(){ CQ> ]jQ,2
return items; 4B$bj`h
} WG%2<Q^
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publicvoid setItems(List items){ n7DLJ`ho{
this.items = items; 2AK}D%jfc
} 6x4_b
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publicint getPageSize(){ m6MaX}&zv
return pageSize; 6~@5X}^<0
} usH%dzKK
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publicvoid setPageSize(int pageSize){ bNs[O22
this.pageSize = pageSize; e5OVq
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} *"T+G*~
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publicint getTotalCount(){ r|-J8s#
return totalCount; qTy v.#{y
} K PggDKS
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publicvoid setTotalCount(int totalCount){ $5L(gn[
if(totalCount > 0){ 'tuBuYD\
this.totalCount = totalCount; la`"$f
int count = totalCount / Hirr=a3
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pageSize;
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if(totalCount % pageSize > 0) 61,O%lV
count++; O6]u!NqG
indexes = newint[count]; PbN3;c3
for(int i = 0; i < count; i++){ {AgBwBCE
indexes = pageSize * ^A#x<J+
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} }!B.K^@)
}else{ \(bj(any
this.totalCount = 0; LG6I_[
} +{*)}[w{x
} qc&jd
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publicint[] getIndexes(){ r?$&Z^
return indexes; acae=c|X
} }.t^D|
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publicvoid setIndexes(int[] indexes){ {*fUJmao"
this.indexes = indexes; 5M.Red.L
} D aDUK?
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publicint getStartIndex(){ # JFYws
return startIndex; GhiHA9.
} nX 8B;*p6b
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publicvoid setStartIndex(int startIndex){ S}mm\<=1
if(totalCount <= 0) CjV7q y
this.startIndex = 0; D!me%;
elseif(startIndex >= totalCount) D 2$^"
this.startIndex = indexes K1-+A2snhV
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[indexes.length - 1]; C*Xik9n
elseif(startIndex < 0) vX 1W@s
this.startIndex = 0; 9tAE#A
else{ B!iFmkCy
this.startIndex = indexes FE}s#n_Pd
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[startIndex / pageSize]; 23k)X"5
} ]_\AHnJ
} q|Fjm]AF
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publicint getNextIndex(){ AoU_;B\b%
int nextIndex = getStartIndex() + q#m!/wod
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pageSize; "u5KbJW
if(nextIndex >= totalCount) $E @ouX?
return getStartIndex(); jJ<;2e~OW
else (gDQ\t@3-
return nextIndex; ;t~*F#p(!
}
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publicint getPreviousIndex(){ sX!3_'-
int previousIndex = getStartIndex() - Wt"ww~h`(
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pageSize; Q!`)e @r
if(previousIndex < 0) iel-<(~
return0; 6N?#b66
else 8XlU%a6x
return previousIndex; zF?31\GOX
} gY%OhYtF2
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} ?0uOR*y'
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抽象业务类 3jXR"@Z-
java代码: L7<+LA)s0
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/** pbPz$Y
* Created on 2005-7-12 [0wP\{%
*/ dDo6fP2
package com.javaeye.common.business; i`R(7Z
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import java.io.Serializable; :q(D(mK
import java.util.List; B_!wutV@
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import org.hibernate.Criteria; ~z &0qQ
import org.hibernate.HibernateException; WX ,p`>n
import org.hibernate.Session; ;eP_;N5+J
import org.hibernate.criterion.DetachedCriteria; Q7L)f71i
import org.hibernate.criterion.Projections; */4tJG1U
import @K7ebYr?
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org.springframework.orm.hibernate3.HibernateCallback; WejyYqr34-
import k~{Fnkt
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org.springframework.orm.hibernate3.support.HibernateDaoS [#IBYJ.6
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upport; 40R"^*
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import com.javaeye.common.util.PaginationSupport; 28ja-1dB
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public abstract class AbstractManager extends >CH
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HibernateDaoSupport { '^e0Ud,
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privateboolean cacheQueries = false; QjI#Cs}w
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privateString queryCacheRegion; _a fciyso
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publicvoid setCacheQueries(boolean CcBQo8!G
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cacheQueries){ gAj0ukX5
this.cacheQueries = cacheQueries; tB]`Hj
} :-(U%`a[
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publicvoid setQueryCacheRegion(String UE\%e9<l
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queryCacheRegion){ cW=Qh-`jU;
this.queryCacheRegion = DE'Xq6#PK
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queryCacheRegion; GI}4,!^N
} Sw yaYK
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publicvoid save(finalObject entity){ F
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getHibernateTemplate().save(entity); p@vpd
} O5ucI$s
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publicvoid persist(finalObject entity){ J0&zb'1
getHibernateTemplate().save(entity); Tc9&mKVE%(
} ,?Ok[G!cm
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publicvoid update(finalObject entity){ d:A\<F
getHibernateTemplate().update(entity); +d.u##$
} _L8Mpx*E
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publicvoid delete(finalObject entity){ >9 q]>fJ
getHibernateTemplate().delete(entity); G!nl'5|y
} )t*S'R
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publicObject load(finalClass entity, qi(&8in
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finalSerializable id){ lQ+Ru8I
return getHibernateTemplate().load ,m2A
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(entity, id); 7We?P,A\;
} f$Gr`d
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publicObject get(finalClass entity, q
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finalSerializable id){ c]GQU
return getHibernateTemplate().get Lc58lV=
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(entity, id); 8w03{H
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} O5g}2
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publicList findAll(finalClass entity){ 0PYvey }[
return getHibernateTemplate().find("from G%xb0%oi]%
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" + entity.getName()); eLCdAr
} ll^Th >
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publicList findByNamedQuery(finalString sGXp}{E9
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namedQuery){ F~tm`n8Z
return getHibernateTemplate @~JB\j9
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().findByNamedQuery(namedQuery); R1II k
} !y.ei1diw
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publicList findByNamedQuery(finalString query, ,Y`'myL8W
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finalObject parameter){ !x`;>0
return getHibernateTemplate ?R dmKA
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().findByNamedQuery(query, parameter); =6.8bZT\
} :&xz5c`"04
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publicList findByNamedQuery(finalString query, *!._Ais,\
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finalObject[] parameters){ Ask' !
return getHibernateTemplate |z.Gh1GCy
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().findByNamedQuery(query, parameters); l[tY,Y:4qO
} Dm7Y#)%8
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publicList find(finalString query){ 6H(fk1E
return getHibernateTemplate().find G>
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(query); 3$GY,B
} 4JX`>a{<
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publicList find(finalString query, finalObject @N,:x\
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parameter){ 3r,1^h
return getHibernateTemplate().find G3 Idxs
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(query, parameter); ap Fs UsE
} *ge].E
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public PaginationSupport findPageByCriteria y0/WA4,
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(final DetachedCriteria detachedCriteria){ Dj-\))L
return findPageByCriteria <dju6k7uz
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 1x~%Ydy
} 7P3<o!YA
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public PaginationSupport findPageByCriteria >2l13^Y
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(final DetachedCriteria detachedCriteria, finalint -@EBbM&
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startIndex){ (|yRo
return findPageByCriteria Wl^prs7}c
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(detachedCriteria, PaginationSupport.PAGESIZE, += |hMQ;
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startIndex); -X"5G
} tYI]LL
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public PaginationSupport findPageByCriteria 6{JR 0
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(final DetachedCriteria detachedCriteria, finalint *u|lmALs
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pageSize, /'8*aUa
finalint startIndex){ {0NsDi>(2
return(PaginationSupport) {-xi0D/Y;
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getHibernateTemplate().execute(new HibernateCallback(){ yt/20a
publicObject doInHibernate 6%\7.h
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(Session session)throws HibernateException { uM6CG0
Criteria criteria = (PCimT=5
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detachedCriteria.getExecutableCriteria(session); K;@RUy~
int totalCount = 9_M H
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((Integer) criteria.setProjection(Projections.rowCount ]FY?_DGOA
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()).uniqueResult()).intValue(); &&(4n?
criteria.setProjection %Y)PH-z
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(null); }<(
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List items = q7 %=`l
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criteria.setFirstResult(startIndex).setMaxResults T..N*6<X
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(pageSize).list(); ]y1$F
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PaginationSupport ps = wQo6!H"K
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new PaginationSupport(items, totalCount, pageSize, LG/=+[\{E
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startIndex); 8]cv &d1f
return ps; tJ?qcT?
} `l[6rf_.
}, true); 1S*8v 7
} w>NZRP_3
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public List findAllByCriteria(final hYP6z^
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DetachedCriteria detachedCriteria){ ,_"7|z wb
return(List) getHibernateTemplate ~6@c]:
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().execute(new HibernateCallback(){ cM> G>Yzo
publicObject doInHibernate ! /|0:QQi
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(Session session)throws HibernateException { zer&`Vr
Criteria criteria = IEno.i\
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detachedCriteria.getExecutableCriteria(session); 2- Npw%;
return criteria.list(); j:rs+1bc
} GsP@ B'
}, true); OBKC$e6I
} vxbH^b
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public int getCountByCriteria(final eeI9[lTw
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DetachedCriteria detachedCriteria){ ?YkO+?}+
Integer count = (Integer) "xvV'&lQ
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getHibernateTemplate().execute(new HibernateCallback(){
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publicObject doInHibernate z)
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(Session session)throws HibernateException { G<">/_jn
Criteria criteria = z{D$~ ob
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detachedCriteria.getExecutableCriteria(session); 2g ?Jb5)
return )E[
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criteria.setProjection(Projections.rowCount 7})!>p )
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()).uniqueResult(); fw(j6:p
} ^td!g1"<
}, true); jt'Y(u]2
return count.intValue(); S+_A
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} 0]:*v?
} J-eA,9J
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用户在web层构造查询条件detachedCriteria,和可选的 2#$}yP~
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 LhVLsa(-%
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PaginationSupport的实例ps。 dFI.`pB
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ps.getItems()得到已分页好的结果集 y :i[~ y
ps.getIndexes()得到分页索引的数组 5fvUv"m
ps.getTotalCount()得到总结果数 C$2o
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ps.getStartIndex()当前分页索引 }OX>(
ps.getNextIndex()下一页索引 G(7\<x:
ps.getPreviousIndex()上一页索引 A_6/umF[ZA
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 T,xVQ4J?
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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 VxPTh\O*[
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一下代码重构了。 bAy5/G!_R
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我把原本我的做法也提供出来供大家讨论吧: $:-= >
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首先,为了实现分页查询,我封装了一个Page类: }'w^<:RSy
java代码: G8<It5CU
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/*Created on 2005-4-14*/ e$/Zb`k
package org.flyware.util.page; WrK^>
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/** B!E<uVC
* @author Joa 0o"<^]
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* @WDqP/4
*/ X/;"CM
publicclass Page { R<0!?`b
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/** imply if the page has previous page */ zhR_qW+
privateboolean hasPrePage; 6Ymo%OT
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/** imply if the page has next page */ N?U&(@p
privateboolean hasNextPage; `MpC<sit
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/** the number of every page */ qI V`zZc
privateint everyPage; 2)I'5?I
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/** the total page number */ v;F+fOo
privateint totalPage; T h- vG
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/** the number of current page */ -JyODW#j
privateint currentPage; n4r( Vg1GS
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/** the begin index of the records by the current +DV6oh
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query */ 6 peM4X
privateint beginIndex; woH3?zR
}Bod#|`
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/** The default constructor */ ae(]9 VW
public Page(){ ;u-< {2P
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} Vp-OGX[
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/** construct the page by everyPage - m x3^
* @param everyPage n5,Pq+[
* */ &<