Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 }I-nT!D'y
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Zp^O1&\SK?
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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 \pfa\,rW
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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 #>("(euXMF
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分页支持类: / Ws>;0
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java代码: V:'F_/&X?
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package com.javaeye.common.util; 8QK8q:|
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import java.util.List; }x\#ul)
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publicclass PaginationSupport { `WN80d\)&
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publicfinalstaticint PAGESIZE = 30; r'j88)^
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privateint pageSize = PAGESIZE; ^!\AT!OT
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privateList items; |(Mxbprz
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privateint totalCount; 4NW!{Vw ,
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privateint[] indexes = newint[0]; wpuK?fP
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privateint startIndex = 0;
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public PaginationSupport(List items, int j
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totalCount){ babL.Ua8o
setPageSize(PAGESIZE); %L* EB;nK
setTotalCount(totalCount); W/bW=.d
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setItems(items); T2S_>
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setStartIndex(0); _*6]4\;
} OU/}cu
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public PaginationSupport(List items, int 0S$k;q
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totalCount, int startIndex){ A6]X
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setPageSize(PAGESIZE); KCyV |,+n
setTotalCount(totalCount); QR#>Ws
setItems(items); sFz0:SqhE
setStartIndex(startIndex); cVW7I
} e
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public PaginationSupport(List items, int olv?$]
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totalCount, int pageSize, int startIndex){ 8#yu.\N.xt
setPageSize(pageSize); kEnGr6e
setTotalCount(totalCount); dEtjcId
setItems(items); ZI!:
setStartIndex(startIndex); UgGa]b[9A
} xj;:B( i
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publicList getItems(){ }x`Cnn
return items; MGm*({%
} KJ'ID
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publicvoid setItems(List items){ \)No?fB
this.items = items; ")Not$8
} |qn2b=
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publicint getPageSize(){ ?I6rW JcQ6
return pageSize; YUEyGhkMV{
} PiKP.
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publicvoid setPageSize(int pageSize){ [[IMf-]
this.pageSize = pageSize; "a)6g0gw
} iibG$?(
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publicint getTotalCount(){ 9Vm1q!lE
return totalCount; RH;ulAD6(~
} S{;Pga*Px
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publicvoid setTotalCount(int totalCount){ }4Yz P 4
if(totalCount > 0){ h5'hP>b#
this.totalCount = totalCount; >n09K8
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int count = totalCount / Y 3ApW vS
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pageSize; (p%|F`
if(totalCount % pageSize > 0) - j3Lgm
count++; 6/8K2_UeoW
indexes = newint[count]; G^W0!u,@
for(int i = 0; i < count; i++){ '%rT]u3U
indexes = pageSize * =NtHV4=b
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} &" t~d}Rg
}else{ L5FOlzn
this.totalCount = 0; v]V N'Hs?
} 8D )nM|
} `MSig)V
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publicint[] getIndexes(){ X
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return indexes; [nO3%7t@
} q~R8<G%YK
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publicvoid setIndexes(int[] indexes){ "@nH;Xlq
this.indexes = indexes; X,v.1#[
} !{jw!bB
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publicint getStartIndex(){ s-"KABEE
return startIndex; ]
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} C(XV
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publicvoid setStartIndex(int startIndex){ !XtG6ON=
if(totalCount <= 0) Z`tmuu
this.startIndex = 0; oPmz$]_Z
elseif(startIndex >= totalCount) fY00
this.startIndex = indexes +\T8`iCFB
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[indexes.length - 1]; RK!9(^Ja
elseif(startIndex < 0) l}uZxKuYx
this.startIndex = 0; dS6 $
else{ i&:SWH=
this.startIndex = indexes NuQ!huh
7
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[startIndex / pageSize]; be8T<F
} u4Nh_x8\Nr
} H@uu;:l<7A
h< r(:.%!}
publicint getNextIndex(){ M1/d7d
int nextIndex = getStartIndex() + |jiIx5qr
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pageSize; ;g!rc#z2g
if(nextIndex >= totalCount) u}nS dZC
return getStartIndex(); O-V|= t
else D -tRy~}
return nextIndex; O{l4 f:51
} "&2 F
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publicint getPreviousIndex(){ 8 MO-QO
int previousIndex = getStartIndex() - KmNnW1T
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pageSize; Q7aPW\-
if(previousIndex < 0) V5K/)\#
return0; ,4Q4{Tx
else w,p'$WC*
return previousIndex; "QnYT3[l"
} , MXU]{
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} \\k=N(n
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抽象业务类 I}_}VSG(
java代码: DquLr+s~
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/** Tgz=I4g
* Created on 2005-7-12 g=t`3X#d
*/ 8ao-]QoMZ
package com.javaeye.common.business; ;stjqTd
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import java.io.Serializable; &[[r|
import java.util.List; FoetP`
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import org.hibernate.Criteria; 5GM-*Ak @
import org.hibernate.HibernateException; uHKEt[PS$
import org.hibernate.Session; zr|DC] 3
import org.hibernate.criterion.DetachedCriteria; JdS,s5Z>
import org.hibernate.criterion.Projections; uN)c!='I
import w^0hVrws=,
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org.springframework.orm.hibernate3.HibernateCallback; lEHx/#qt9
import I!L J&>
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org.springframework.orm.hibernate3.support.HibernateDaoS qx ki
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upport; p3A9<g
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import com.javaeye.common.util.PaginationSupport; x@OBGKV
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public abstract class AbstractManager extends Vkg0C*L_
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HibernateDaoSupport { ;5ki$)v"
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privateboolean cacheQueries = false; 86{>X5 +
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privateString queryCacheRegion; 1b~21n
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publicvoid setCacheQueries(boolean c]{}|2u
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cacheQueries){ F1.Xk1y%
this.cacheQueries = cacheQueries; fQ5v?(
} _bCAZa&&
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publicvoid setQueryCacheRegion(String DC h
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queryCacheRegion){ dy_Uh)$$|g
this.queryCacheRegion = 'JOCL0FP
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queryCacheRegion; 7su2A>Ix
} ;<M}ZL@m
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publicvoid save(finalObject entity){ |<u+Xi
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getHibernateTemplate().save(entity); m8L *LB
} N~,Ipf
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publicvoid persist(finalObject entity){ @mCe{r*`
getHibernateTemplate().save(entity); 4J5 zSTw
} uP* kvi:e
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publicvoid update(finalObject entity){ )Jjp^U3Ub
getHibernateTemplate().update(entity); J!l/.:`6
} 7GO9z<m)
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publicvoid delete(finalObject entity){ 4NID:<
getHibernateTemplate().delete(entity); Oz6$u
} `-{l$Hn9|~
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publicObject load(finalClass entity, 486\a
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finalSerializable id){ K[icVT2v~
return getHibernateTemplate().load G*4I;'6
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(entity, id); Q2 !GWz$
} S=,czs3N
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publicObject get(finalClass entity, _]zX W
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finalSerializable id){ kf'(u..G
return getHibernateTemplate().get
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(entity, id); IB&G#2M<
} -|FHv+
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publicList findAll(finalClass entity){ %e]G]B%
return getHibernateTemplate().find("from 7K.75%}
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" + entity.getName()); y7>3hfn~w
} 5@xR`g-
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publicList findByNamedQuery(finalString p/(Z2N"
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namedQuery){ B2kZ_4rB
return getHibernateTemplate mI7lv;oN<5
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().findByNamedQuery(namedQuery); /''=V.-N
} Zp/+F(
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publicList findByNamedQuery(finalString query, inU5eronuj
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finalObject parameter){ _G'ki.[S7
return getHibernateTemplate %"v:x?d$$o
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().findByNamedQuery(query, parameter); *1EmK.-'u
} {3
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publicList findByNamedQuery(finalString query, `+n0a@BVB
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finalObject[] parameters){ zH~P-MqC
return getHibernateTemplate 6agq^wI
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().findByNamedQuery(query, parameters); Cdz?+hb
} n,FyK`x
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publicList find(finalString query){ ML>M:Ik+
return getHibernateTemplate().find ht%qjE
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(query); _h<rVcl!wX
} BX$<5S@
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publicList find(finalString query, finalObject Q`*U U82!
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parameter){ HK :K~h
return getHibernateTemplate().find /!0&b?
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(query, parameter); 8$~oiK%fw
} =u}~\ 'd
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public PaginationSupport findPageByCriteria MDytA0M
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(final DetachedCriteria detachedCriteria){ FQ0&{ulb
return findPageByCriteria F?'
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); #qVTB@d
} ?Ojv<L-f.:
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public PaginationSupport findPageByCriteria ^S`hKv&87
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(final DetachedCriteria detachedCriteria, finalint a_!H_J
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startIndex){ C5^WJx[
return findPageByCriteria L|WrdT D;
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(detachedCriteria, PaginationSupport.PAGESIZE, .<?7c!ho
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startIndex); \bT0\
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} d,?D '/
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public PaginationSupport findPageByCriteria MUbKlX
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(final DetachedCriteria detachedCriteria, finalint |a03SZx
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pageSize, fNi&r0/-t
finalint startIndex){ 2'=)ese
return(PaginationSupport) $yi:0t8t
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getHibernateTemplate().execute(new HibernateCallback(){ P<X?
publicObject doInHibernate Ag2~q
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(Session session)throws HibernateException { B~]6[Z
Criteria criteria = I)yaR+l
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detachedCriteria.getExecutableCriteria(session); FR6 W-L
int totalCount = hpXW tQ
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((Integer) criteria.setProjection(Projections.rowCount J>#hu3&UOQ
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()).uniqueResult()).intValue(); w tGS"L
criteria.setProjection KWDH
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(null); q}p$S2`
List items = ShL!7y*rT{
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criteria.setFirstResult(startIndex).setMaxResults FVkl#Qy~
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(pageSize).list(); HqsqUS3[
PaginationSupport ps = YGPb8!
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new PaginationSupport(items, totalCount, pageSize, 00D.Jn
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startIndex); @{RhO|UR
return ps; @7"n X
} h1(i/{}:
}, true); ZDaHR-%Y
} o|d:rp!^
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public List findAllByCriteria(final Q?T+^J
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DetachedCriteria detachedCriteria){ 2He R1m<
return(List) getHibernateTemplate E4o{Z+C
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().execute(new HibernateCallback(){ _)<5c!
publicObject doInHibernate 6X9$T11Vc
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(Session session)throws HibernateException { e;~(7/1
Criteria criteria = zmZU"eWp)
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detachedCriteria.getExecutableCriteria(session); jFg19C{=X
return criteria.list(); h
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} =9QyOh
}, true); o=94H7@
} %pWJ2J@
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public int getCountByCriteria(final wQ+il6
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DetachedCriteria detachedCriteria){ sF)$<[w
Integer count = (Integer) PW%ith1)<
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getHibernateTemplate().execute(new HibernateCallback(){ ?s>_^xfD
publicObject doInHibernate m Qx1co
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(Session session)throws HibernateException { > .}G[C
Criteria criteria = cM9>V2:P
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detachedCriteria.getExecutableCriteria(session); :(OV{ u
return GGwwdB\x'
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criteria.setProjection(Projections.rowCount p`&{NR3+
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()).uniqueResult(); Fv,c8f
} 8zRw\]?
}, true);
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return count.intValue(); 65@GXn[W_
} K)l*$h&-
} R~A))4<%%
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用户在web层构造查询条件detachedCriteria,和可选的
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 VIGLl'8p
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PaginationSupport的实例ps。 $B>L_~cS
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ps.getItems()得到已分页好的结果集 d72( g$F
ps.getIndexes()得到分页索引的数组 \QSD*
ps.getTotalCount()得到总结果数 S]T71W<i
ps.getStartIndex()当前分页索引 }Dcpe M?
ps.getNextIndex()下一页索引 2y$DTMu
ps.getPreviousIndex()上一页索引 xzMpT ZQ
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 MD1d
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 )"P.n-aF
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一下代码重构了。 zhRF>Y`
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我把原本我的做法也提供出来供大家讨论吧: 9p02K@wkD
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首先,为了实现分页查询,我封装了一个Page类: k
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java代码: y fS
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/*Created on 2005-4-14*/ Q3)[
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package org.flyware.util.page; rA_r$X
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/** j\.pS^+
* @author Joa JKXIxw>q
* ZZ0b!{qj3
*/ @M }`nKXM
publicclass Page { ocp3J R_0
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/** imply if the page has previous page */ b$Bq#vdg:
privateboolean hasPrePage; Q6X}R,KA1
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/** imply if the page has next page */ [z}$G:s
privateboolean hasNextPage; 5FNf)F
q=BAYZ\`
/** the number of every page */ q*J-ii
privateint everyPage; 79lG~BGE
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/** the total page number */ $/JnYkL{m
privateint totalPage; |TBKsx8
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/** the number of current page */ {}PBYXR
privateint currentPage; uUpOa+t
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/** the begin index of the records by the current P}p6{
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query */ MES| iB
privateint beginIndex; 5U l=Nv]
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/** The default constructor */ z1~U#
public Page(){ J&b&*3
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} +Mh 9Jf
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/** construct the page by everyPage PmE2T\{s!
* @param everyPage P\|i<Ds_M
* */ laFF/g;sRC
public Page(int everyPage){ RE:$c!E!
this.everyPage = everyPage; ]
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} T/l2B1
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/** The whole constructor */ .We"j_
}
public Page(boolean hasPrePage, boolean hasNextPage, x~O_v
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int everyPage, int totalPage, Os7 3u#!'
int currentPage, int beginIndex){ b<rJ@1qtJ
this.hasPrePage = hasPrePage; v:]
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this.hasNextPage = hasNextPage; %g&i.2v
this.everyPage = everyPage; QI2T G,
this.totalPage = totalPage; IC7S
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this.currentPage = currentPage; AfW9;{j&I
this.beginIndex = beginIndex; 4q5bW+$Xj
} x-{awP
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/** Z)zmT%t
* @return vN4g#,<
* Returns the beginIndex. f9 b=Zm'
*/ 6|:]2S
publicint getBeginIndex(){ @=[SsS
return beginIndex; APksY!
} DV/P/1E
# nh;KlI0
/** @v,qfT*k7
* @param beginIndex G" Fd]'
* The beginIndex to set. f)+fdc
*/ D ~Y3\KP
publicvoid setBeginIndex(int beginIndex){ ~m56t5+uw
this.beginIndex = beginIndex; sf5koe
} _,4f z(
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/** COK7 i^
* @return .ZrQ{~t
* Returns the currentPage. ^CwzAB
*/ |f0KIb}d
publicint getCurrentPage(){ 8BZDaiE"
return currentPage; DjjG?(1
} GZ];U]_
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/** %h%^i
* @param currentPage $fY4amX6Z
* The currentPage to set. RSY{IY
*/ a{6rQ
publicvoid setCurrentPage(int currentPage){ `?VB)
this.currentPage = currentPage; *5#Y[c
} i- E~ZfJ
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/** ?8X+)nU@
* @return bewi.$E{
* Returns the everyPage. %o+VZEH3
*/ 'qhA4W9
publicint getEveryPage(){ g9;}?h
return everyPage; 9)QvJ87e@7
} eRa1eRgP
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/** }IGr%C(3%
* @param everyPage +S:(cz80V
* The everyPage to set. a-,BBM 8|
*/ Ss&R!w9p
publicvoid setEveryPage(int everyPage){ J~:/,'Ea
this.everyPage = everyPage; 16YJQ ue
} #{l+I(M
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/** y@G5I>v
* @return mMw&{7b:
* Returns the hasNextPage. swnov[0
*/ XH0R:+s
publicboolean getHasNextPage(){ xS,#TU;)Ol
return hasNextPage; Tp`by
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} /9WR>NUAO
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/** Au"[2cG
* @param hasNextPage #uT-_L}sw
* The hasNextPage to set. l\*}
*/ 3M(:}c
publicvoid setHasNextPage(boolean hasNextPage){ 8lt P)K4
this.hasNextPage = hasNextPage; 3
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} UPPDs "
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/** HT5G HkT
* @return _'dsEF
* Returns the hasPrePage. 1DGVAIcD
*/ l9q
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publicboolean getHasPrePage(){ ^c^9kK'
return hasPrePage;
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} rBkf @
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/** Q/=L(_1l
* @param hasPrePage
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* The hasPrePage to set. ^ow[XEB%
*/ d"nE+pgE
publicvoid setHasPrePage(boolean hasPrePage){ aIZ@5w"7
this.hasPrePage = hasPrePage; iR(A^
} ][6$$Lz
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/** KC?h sID{
* @return Returns the totalPage. H4 &
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* oyJ/Oe
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*/ ALwkX"AN
publicint getTotalPage(){ oWo"`"P
return totalPage; wr8n*Du
} #=b_!~:%
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/** MlsF?"H p
* @param totalPage &H,j
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* The totalPage to set. <0 R7uH
*/ JHc|.2Oe
publicvoid setTotalPage(int totalPage){ OtF{=7
this.totalPage = totalPage; *6q8kQsz^1
} fh
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X
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} oFHVA!lqe
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 ^QB/{9 #
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个PageUtil,负责对Page对象进行构造: z>&Py(
java代码: &.+[~2
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/*Created on 2005-4-14*/ ~5`rv1$
package org.flyware.util.page; Yiu)0\ o
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import org.apache.commons.logging.Log; u|WX?@\
import org.apache.commons.logging.LogFactory; ;MCv
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/** PFG):i-?
* @author Joa 5cxA,T
* u$&