Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 q.QYn.CBZz
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 d1La7|43u
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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 {=4:Tgw
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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 4KSN;G
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分页支持类: (a!,)
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java代码: 4H=sD
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package com.javaeye.common.util; HbSx}bM_9
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import java.util.List; `gs,JJ6N
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publicclass PaginationSupport { ?8}jJw2H
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publicfinalstaticint PAGESIZE = 30; DmPsltpzQ
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privateint pageSize = PAGESIZE; _-\{kJ
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privateList items; WA5kX SdIb
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privateint totalCount; [eP]8G\
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privateint[] indexes = newint[0]; {o<p{q
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privateint startIndex = 0; s?#lhI
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public PaginationSupport(List items, int OBSJbDqT
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totalCount){ ~(]DNXB8I`
setPageSize(PAGESIZE); ,ToEKId
setTotalCount(totalCount); 8HA=O?Cg
setItems(items); U7eQ-r
setStartIndex(0); G.e\#_RR?
} kP@OIhRe
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public PaginationSupport(List items, int R0d|j#vP
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totalCount, int startIndex){ M=`Se&-M
setPageSize(PAGESIZE); O;?~#E<6w
setTotalCount(totalCount); Bcon4
setItems(items); @il}0
setStartIndex(startIndex); CW YJ<27v{
} B[X6AQj}d
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public PaginationSupport(List items, int 94@!.11
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totalCount, int pageSize, int startIndex){ BniVZCct
setPageSize(pageSize); (Fd4Gw<sq
setTotalCount(totalCount); io3'h:+9s
setItems(items); l'\b(3JF
setStartIndex(startIndex); }rZ=j6Z
} rep"xV&|>o
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publicList getItems(){ ;rL$z;}8
return items; L-$g& -
} LXV6Ew5E
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publicvoid setItems(List items){ FQ)Ekss~C
this.items = items; ".<p R}
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} $?{zV$r1
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publicint getPageSize(){ n_meJm.
return pageSize; \c}r6xOr
} j=S"KVp9NF
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publicvoid setPageSize(int pageSize){ 9E?>B3t^
this.pageSize = pageSize; \ y",Qq?
} oP
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publicint getTotalCount(){ iNSJOS
return totalCount; V'/%)oU\"
} \0*LfVr;P
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publicvoid setTotalCount(int totalCount){ c'R|Wyf
if(totalCount > 0){ ^]gl#&"D
this.totalCount = totalCount; {'kL]qLg
int count = totalCount / pBkPn+@
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pageSize; 3)\qts5
if(totalCount % pageSize > 0) {Aw3Itef
count++; RUu'9#fq
indexes = newint[count]; nQ~L.V
for(int i = 0; i < count; i++){ Njje g9 f
indexes = pageSize * S:QEHd_C
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} h zE)>f
}else{ B.#0kjA}
this.totalCount = 0; 8t!"K_Mkx
} Lp=B? H
} B,T.bgp\
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publicint[] getIndexes(){ %xz02$k
return indexes; K%B i8d
} XZGyh X7
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publicvoid setIndexes(int[] indexes){ 'QU ?O[CH
this.indexes = indexes; W9~datIh>
} oR)7 \;g
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publicint getStartIndex(){ CuNHDYQ&3
return startIndex; Ipx:k+J
} ZT#G:a
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publicvoid setStartIndex(int startIndex){ 1S:H!h3
if(totalCount <= 0) |t_2AV
this.startIndex = 0; 3RUB2c4
elseif(startIndex >= totalCount) }.zn:e
this.startIndex = indexes ,P +&-}gn9
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[indexes.length - 1]; m<4Lo0?nS
elseif(startIndex < 0) ZxWV,s&p
this.startIndex = 0; Op{Mc$5a
else{ $@Fj_
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this.startIndex = indexes ."O(Ig[
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[startIndex / pageSize]; <0m;|Ai'W
} R?Qou!*]
} J:a^''
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publicint getNextIndex(){ dmO|PswW
int nextIndex = getStartIndex() + ~-/AKaK}
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pageSize; FCPbp!q6
if(nextIndex >= totalCount) /2@@v|QL
return getStartIndex(); PdZSXP4;k
else w[&BY
return nextIndex; -=w.tJD
} we9AB_y
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publicint getPreviousIndex(){ 8ZDq
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int previousIndex = getStartIndex() - q8J/tw?%v
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pageSize; &AVi4zV
if(previousIndex < 0) zl5S)/A
return0; 3^Y-P8.zdB
else $B2@mC([S
return previousIndex; ITV}f#
} hGeRM4zVZZ
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} xjpW<-)MLf
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抽象业务类 s5HbuyR^
java代码: 7^F?key?
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/** 6FE[snw
* Created on 2005-7-12 tdm /U
*/ VbjFQ@[l!
package com.javaeye.common.business; M<nn+vy`
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import java.io.Serializable; Sa0\93oa
import java.util.List; 0Ju{6x(|
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import org.hibernate.Criteria; JpDkf$kM
import org.hibernate.HibernateException; jv ";?*I6.
import org.hibernate.Session; `xSXGI
import org.hibernate.criterion.DetachedCriteria; 0/Csc\Xl
import org.hibernate.criterion.Projections; -vyC,A
import I
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org.springframework.orm.hibernate3.HibernateCallback; Q%a4g
import ~VKw%WK
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org.springframework.orm.hibernate3.support.HibernateDaoS .1@5*xQ5O
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upport; "O4Z).5q3
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import com.javaeye.common.util.PaginationSupport; +vP1DXtj(
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public abstract class AbstractManager extends a'Z"Yz^Eo
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HibernateDaoSupport { ~VOmMw4HV
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privateboolean cacheQueries = false; <
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privateString queryCacheRegion; #L"h>,b
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publicvoid setCacheQueries(boolean L4!$bB~L-
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cacheQueries){ Wq4?`{
this.cacheQueries = cacheQueries; nT>?}/S
} Oj:`r*z43
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publicvoid setQueryCacheRegion(String y&
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queryCacheRegion){ V;m3=k0U
this.queryCacheRegion = p7*\]HyE)
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queryCacheRegion; R1nctA:
} O/Fzw^
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publicvoid save(finalObject entity){ qRUz;M4
getHibernateTemplate().save(entity); 'g#))y
} 'D1@+FFU0
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publicvoid persist(finalObject entity){ CB~&!MdMr
getHibernateTemplate().save(entity); Bpgl
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} f /jN $p
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publicvoid update(finalObject entity){ hi37p1t
getHibernateTemplate().update(entity); cIgF]My*D@
} 1G\ugLm
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publicvoid delete(finalObject entity){ sB6UlX;b:
getHibernateTemplate().delete(entity); qRU8uu
} I=1tf;Bsi
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publicObject load(finalClass entity, p\(%bO
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finalSerializable id){ 6)TFb,
return getHibernateTemplate().load V3jx{BXs2
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(entity, id); 03,+uf
} Sh"} c2
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publicObject get(finalClass entity, "^u|vCqw
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finalSerializable id){ k -SUp8}g
return getHibernateTemplate().get t0wLj}"U
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(entity, id); c<e$6:|xM
} 5L4~7/kj
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publicList findAll(finalClass entity){ +%FGti$[
return getHibernateTemplate().find("from lVqvS/_k$
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" + entity.getName()); uy B
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} ;1BbRnCr
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publicList findByNamedQuery(finalString xbIxtZm
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namedQuery){ r:u5+A
return getHibernateTemplate JK_sl>v.7
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().findByNamedQuery(namedQuery); bJ9>,,D
} f$P pFSY4
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publicList findByNamedQuery(finalString query, vXyaOZ
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finalObject parameter){ fx9c1h9s
return getHibernateTemplate {dA#r>z\1
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().findByNamedQuery(query, parameter); &
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} }lWEbQ)(!
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publicList findByNamedQuery(finalString query, cP(/+
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finalObject[] parameters){ o\2#o5#
return getHibernateTemplate Fm*O&6W\@A
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().findByNamedQuery(query, parameters); +lE 9*Gs_$
} lGs fs(
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publicList find(finalString query){ pTcm2-J
return getHibernateTemplate().find wJ+"JQY.J+
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(query); hMi[MB7~
} nE,"3X"
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publicList find(finalString query, finalObject 37{mhU
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parameter){ 0e3aWn
return getHibernateTemplate().find C#(4>'
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(query, parameter); W<kJ%42^j
} Nmp1[/{J
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public PaginationSupport findPageByCriteria _t3n<
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(final DetachedCriteria detachedCriteria){ w${=]h*2
return findPageByCriteria Cvq2UNz(R
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); AOeptv^k3}
} 9QZ;F4 r
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public PaginationSupport findPageByCriteria Ao 1*a%-.
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(final DetachedCriteria detachedCriteria, finalint :tNH Cx
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startIndex){ d&t|Y:,8
return findPageByCriteria AOhsat;O`
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(detachedCriteria, PaginationSupport.PAGESIZE, 8L.Y0_x
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startIndex); {R]4N]l>
} f5^[`b3H
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public PaginationSupport findPageByCriteria 7 zK%CJ
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(final DetachedCriteria detachedCriteria, finalint lY0^Z
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pageSize, mM1\s>o
finalint startIndex){ D.4=4"qMi
return(PaginationSupport) #~ UG9@a
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getHibernateTemplate().execute(new HibernateCallback(){ b4i=eI8
publicObject doInHibernate ^#p Su
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(Session session)throws HibernateException { _=8x?fC:rl
Criteria criteria = wF[^?K '
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detachedCriteria.getExecutableCriteria(session); %YA=W=Yd
int totalCount = @~xNax&^
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((Integer) criteria.setProjection(Projections.rowCount }5FdX3YR
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()).uniqueResult()).intValue(); td&W>(3d
criteria.setProjection ~M2w&g;1
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(null); 80LKxA;5N
List items = b\ F(.8
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criteria.setFirstResult(startIndex).setMaxResults %Gv8]Yb
O\=3{
(pageSize).list(); 5L%A5C&|
PaginationSupport ps = }LN +V~
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new PaginationSupport(items, totalCount, pageSize, >y
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startIndex); X~G!{TT_x6
return ps;
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} $-EbJ
}, true); _T7tq
} =6Ihk
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public List findAllByCriteria(final rB~x]5TH
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DetachedCriteria detachedCriteria){ 4&2aJ_ 2y
return(List) getHibernateTemplate &+u)
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().execute(new HibernateCallback(){ F$N"&<[c
publicObject doInHibernate Wf +j/RxTi
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(Session session)throws HibernateException { 5V Dqx@(
Criteria criteria = pc
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detachedCriteria.getExecutableCriteria(session); oDXUa5x
return criteria.list(); gT22!
} a=+qR:wT
}, true); k,LeBCqGcb
} :
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public int getCountByCriteria(final E9!u|&$S
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DetachedCriteria detachedCriteria){ Ph'*s{
Integer count = (Integer) ~q 0)+'
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getHibernateTemplate().execute(new HibernateCallback(){ JBo/<W#|
publicObject doInHibernate rhGHR5
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(Session session)throws HibernateException { ,b%T[s7
Criteria criteria = gBA
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detachedCriteria.getExecutableCriteria(session); W2e~!:w
return SQ9s
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criteria.setProjection(Projections.rowCount ,A
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()).uniqueResult(); vr+O)/P})
} T0J"Wr>WY
}, true); M.iR5Uh
return count.intValue(); {f3&s4xj=
} dlsVE~_G
} E5(\/;[*`
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用户在web层构造查询条件detachedCriteria,和可选的 wg\*FfQn
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 RsIR}.*
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PaginationSupport的实例ps。 TR/'L!EE
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ps.getItems()得到已分页好的结果集 L
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ps.getIndexes()得到分页索引的数组 k7yQEU
ps.getTotalCount()得到总结果数 1bs8fUPB3
ps.getStartIndex()当前分页索引 B:Ec(USe
ps.getNextIndex()下一页索引 >bWx!M]
ps.getPreviousIndex()上一页索引 ?kEcYD
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 {KYbsD
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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 ]@)T]
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一下代码重构了。 , v,mBYaU
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我把原本我的做法也提供出来供大家讨论吧: P[6@1
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首先,为了实现分页查询,我封装了一个Page类: C50&SrnBU1
java代码: lL_M=td8W
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/*Created on 2005-4-14*/ jsL\{I^>
package org.flyware.util.page; HL-zuZa`Ju
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/** d:jD
* @author Joa yG -1g0
* eq+t%
*/ 1~/?W^ir
publicclass Page { {a-bew
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/** imply if the page has previous page */ D.elE:
privateboolean hasPrePage; `vs=
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/** imply if the page has next page */ c#X9d8>
privateboolean hasNextPage; A??(}F L
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/** the number of every page */ foY=?mbL
privateint everyPage; -{H;w=9
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/** the total page number */ aN9#ATE
privateint totalPage; /c/t_xB
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/** the number of current page */ n46A
privateint currentPage; [C 1o9c!
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/** the begin index of the records by the current 'ap<]mf2
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query */ O9y4.`a"
privateint beginIndex; Vp{e1xpY
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/** The default constructor */ 5y]1v
public Page(){ vowU+Y
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} 2D|2/ >[
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/** construct the page by everyPage b=[gK|fu
* @param everyPage `;Qw/xl_N
* */ pE.f}
public Page(int everyPage){ -WiOs;2~/
this.everyPage = everyPage; YNV!(>\GE
} 34S|[PXd
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/** The whole constructor */ ($a ?zJr
public Page(boolean hasPrePage, boolean hasNextPage, zs#s"e:jeR
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int everyPage, int totalPage, X"QIH|qx-
int currentPage, int beginIndex){ 0uX"KL]Elf
this.hasPrePage = hasPrePage; sjh>i>t
this.hasNextPage = hasNextPage; c 32IO&W4
this.everyPage = everyPage; .Cv0Ze
this.totalPage = totalPage; S;a'@5
this.currentPage = currentPage; K"~Tk`[0Q
this.beginIndex = beginIndex; h%'4V<V
} ShXk\"
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/** u{Jv6K,
* @return cI}qMc
* Returns the beginIndex. O^fg~g X
*/ 8\,|T2w,X
publicint getBeginIndex(){ A)9[.fhx
return beginIndex; *Z0 Y:"
} 6{h+(|.(
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/** d&S4`\g?8
* @param beginIndex /*g9drwaa
* The beginIndex to set. ~" \qX+
*/ biwV7<
publicvoid setBeginIndex(int beginIndex){ ~F5JN^5Y
this.beginIndex = beginIndex; [NQ\(VQ1c
} 5f+ziiZ
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