Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 im*QaO%a4
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 0pBlmPafY
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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 q,QMvUK:
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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 i3rvDch
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分页支持类: D'|#5>G
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java代码: }I;=IYrN
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package com.javaeye.common.util; [~f%z(vI
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import java.util.List; @D[;$YEk
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publicclass PaginationSupport { ',*I=JW;
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publicfinalstaticint PAGESIZE = 30; vh
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privateint pageSize = PAGESIZE; czdNqk.kh
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privateList items; W{=>c/
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privateint totalCount; d3 fE[/oU
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privateint[] indexes = newint[0]; e_\4(4x
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privateint startIndex = 0; M\e%GJ0
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public PaginationSupport(List items, int qB<D'h7
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totalCount){ 6LNm>O
setPageSize(PAGESIZE); QIBv}hgcy
setTotalCount(totalCount); U/D\N0
setItems(items); A~h.,<+"
setStartIndex(0); + 5sTGNG
} 8l+\Qyj
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public PaginationSupport(List items, int )I.[@#-
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totalCount, int startIndex){ qJ5Y}/r
setPageSize(PAGESIZE); z/6kxV 89
setTotalCount(totalCount); \8{C$"F
setItems(items); <`H:Am`
setStartIndex(startIndex); S"5</*
} KB*[b
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public PaginationSupport(List items, int ldI;DoE#U1
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totalCount, int pageSize, int startIndex){ uH65DI<
setPageSize(pageSize); m`4Sp#m
setTotalCount(totalCount); \W??`?Idh
setItems(items); Hd2Sou4-j
setStartIndex(startIndex); ~iEH?J%i1r
} SZK~<@q5
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publicList getItems(){ y?CEV-3+
return items; 19bP0y
} ,t*#o&+
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publicvoid setItems(List items){ VAsaJ`vcb
this.items = items; > 9 i @W@M
} m)=
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publicint getPageSize(){ vxk1RL*Xu
return pageSize; WP2|0ib
} (!W:-|[K\
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publicvoid setPageSize(int pageSize){ B07(15y]
this.pageSize = pageSize; gqyQ Zew
} %I&Hx<Hj
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publicint getTotalCount(){ PZeVjL?E
return totalCount; }`h)+Im=
} ^3*/x%A,g
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publicvoid setTotalCount(int totalCount){ vZhN%
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if(totalCount > 0){ oPo<F5M]d%
this.totalCount = totalCount; x)THeH@
int count = totalCount / M=`F $
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pageSize; `fY~Lv{4d_
if(totalCount % pageSize > 0) 1;]cYIq
count++; WnvuB.(@3
indexes = newint[count]; ZK{VQ~
for(int i = 0; i < count; i++){ ;W'y^jp]"
indexes = pageSize * B~jl1g|
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} &>*fJ
}else{ wu/]M~XwI
this.totalCount = 0; |9~{&<^X
} F1w~f
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}
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publicint[] getIndexes(){ C8-4 m68"
return indexes; 'fy1'^VPAV
} ;oH%d;H
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publicvoid setIndexes(int[] indexes){ |Y0BnyGK
this.indexes = indexes; kbM 4v G
} {%N*AxkvId
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publicint getStartIndex(){ R1{"
return startIndex; sn}U4=u
} -KCm#!
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publicvoid setStartIndex(int startIndex){ ;rV0
if(totalCount <= 0)
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this.startIndex = 0; `.#e4 FBW
elseif(startIndex >= totalCount) 6^if%62l&
this.startIndex = indexes V[HHP_
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[indexes.length - 1]; 9"I/jd0B
elseif(startIndex < 0) eH(8T
this.startIndex = 0; }f; Zx)!
else{ o'D{ql
this.startIndex = indexes kzbgy)PK3
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[startIndex / pageSize]; 6}K|eUak/
} V\r5
} t(\d;ybyx
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publicint getNextIndex(){ ,CA,7Mu:
int nextIndex = getStartIndex() + 5A>W;Q\4
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pageSize; Y"K7$+5#\
if(nextIndex >= totalCount) dSS_^E[{
return getStartIndex(); [6FCbzS_W
else u;F++$=
return nextIndex; &g\D-At
} =L#tSa=M"
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publicint getPreviousIndex(){ <q~&g
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int previousIndex = getStartIndex() - )67Kd]
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pageSize; /IxMRi=
if(previousIndex < 0) 4[ "$}O5
return0; qg 4:Vq
else l$}h1&V7
return previousIndex; CD +,&id
} TMhUo#`I|
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} wbUpD(
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抽象业务类 ${8 1~
java代码: QDzFl1\P
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/** TlYeYN5V
* Created on 2005-7-12 Y@c!\0e$
*/ #W @6@Mv
package com.javaeye.common.business; erdWGUfQOe
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import java.io.Serializable; x&8HBF'
import java.util.List; S=U*is
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import org.hibernate.Criteria; d?$FAy'o5
import org.hibernate.HibernateException; zRx-xWo
import org.hibernate.Session; [@eNb^R
import org.hibernate.criterion.DetachedCriteria; zbOEF
import org.hibernate.criterion.Projections; qq]ZkT}
import JY(_}AAu
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org.springframework.orm.hibernate3.HibernateCallback; DDw H9*
import 4l@*x^F
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org.springframework.orm.hibernate3.support.HibernateDaoS Ep|W>
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upport; a<k x95
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import com.javaeye.common.util.PaginationSupport; V44IA[
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public abstract class AbstractManager extends i5T&1W i
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HibernateDaoSupport { jQFAlO(E':
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privateboolean cacheQueries = false; G +o)s
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privateString queryCacheRegion; u.ffZ]\7l
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publicvoid setCacheQueries(boolean uCB7(<
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cacheQueries){ vj]-p=
this.cacheQueries = cacheQueries; 1mz;4xb
} JQP7>W
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publicvoid setQueryCacheRegion(String ~c%H3e>Jcq
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queryCacheRegion){ L~%@pf>
this.queryCacheRegion = zqh.U@
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queryCacheRegion; Qr6[h!
} z4D[>2*
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publicvoid save(finalObject entity){ 5`53lK.C
getHibernateTemplate().save(entity); X-|Lg.s
} /XEUJC4
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publicvoid persist(finalObject entity){ K9\`Wu_qL
getHibernateTemplate().save(entity); 3R1v0
} Cu3^de@h
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publicvoid update(finalObject entity){ _Qs=v0B//
getHibernateTemplate().update(entity); ^31X-}tv
} Q&}`( ]k
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publicvoid delete(finalObject entity){ 494"-F 6
getHibernateTemplate().delete(entity); 2 1.;lj
} y#!8S{
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publicObject load(finalClass entity, Nih8(pbe
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finalSerializable id){ jc)[5i0
return getHibernateTemplate().load DF|(CQs9
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(entity, id); x9)^0Hbo
} $-H#M]Gq
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publicObject get(finalClass entity, |j($2.
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finalSerializable id){ h W\q
return getHibernateTemplate().get @iWql*K;m
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(entity, id); 4,"%
} Lgw!S~0
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publicList findAll(finalClass entity){ qN%i$mJTo
return getHibernateTemplate().find("from A0Pg|M
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" + entity.getName()); l ?RsXC
} \_;zm+ <{
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publicList findByNamedQuery(finalString #!(OTe L
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namedQuery){ c193Or'6Y
return getHibernateTemplate MO|aN,
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().findByNamedQuery(namedQuery); `./$hh
} XC"]/y
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publicList findByNamedQuery(finalString query, b2]1Dfw
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finalObject parameter){ c `C
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return getHibernateTemplate >|Ps23J#
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().findByNamedQuery(query, parameter); y,e#e`
} is@8x!c
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publicList findByNamedQuery(finalString query, 1;Bgt v$
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finalObject[] parameters){ L6S!?t.{Yv
return getHibernateTemplate vDl6TKXcu
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().findByNamedQuery(query, parameters); ,U':=8
} !lf'gW
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publicList find(finalString query){ s3?pv
return getHibernateTemplate().find r/E'#5 Q
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(query); d(!W
} SKO*x^"eU
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publicList find(finalString query, finalObject :=9?XzCC
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parameter){ 7` AQn],
return getHibernateTemplate().find }Fy~DsQ
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(query, parameter); X.TsOoy
} N0TEVDsk
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public PaginationSupport findPageByCriteria )1f8
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(final DetachedCriteria detachedCriteria){ h^QicvZ
return findPageByCriteria )w\E^
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); it?l! ~
} 2eNA#^T=
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public PaginationSupport findPageByCriteria t0t" =(d
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(final DetachedCriteria detachedCriteria, finalint 2rK%fV53b
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startIndex){ ]3UEju8$
return findPageByCriteria ';<gc5EK
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(detachedCriteria, PaginationSupport.PAGESIZE, =P>c1T1-
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startIndex); yKSvg5lLy
} 3!]S8Y*LQP
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public PaginationSupport findPageByCriteria DdO$&/`)YP
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(final DetachedCriteria detachedCriteria, finalint nSUQ Eho<
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pageSize, zl~`>
finalint startIndex){ 6R_G{AWLL
return(PaginationSupport) dk}T&qZ~p
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getHibernateTemplate().execute(new HibernateCallback(){ -n.ltgW@
publicObject doInHibernate u!wR
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(Session session)throws HibernateException { w'uI~t4
Criteria criteria = =/_tQR~
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detachedCriteria.getExecutableCriteria(session); Qe8F(k~k
int totalCount = )8ub1,C
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((Integer) criteria.setProjection(Projections.rowCount )qxZHV
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()).uniqueResult()).intValue(); ``
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criteria.setProjection aB@D-Y"HO
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(null); Z.:g8Xl-6
List items = mRJX,
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criteria.setFirstResult(startIndex).setMaxResults |"7F`M96I
OB-gH3:
(pageSize).list(); *>b*I4dz
PaginationSupport ps = j2\B(PA
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new PaginationSupport(items, totalCount, pageSize, 1D@'uApi.
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startIndex); j A/xe
return ps; TCb 7-s
} _wvSLu <q
}, true); w0`aW6t#
} `R\aNgCS}
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public List findAllByCriteria(final Rwu
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DetachedCriteria detachedCriteria){ 1^F
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return(List) getHibernateTemplate LI`L!6^l
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().execute(new HibernateCallback(){ .rfKItd
publicObject doInHibernate Z %?:
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(Session session)throws HibernateException { T~=r*4
Criteria criteria = ?_hKhn%K9
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detachedCriteria.getExecutableCriteria(session); 6
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return criteria.list(); (f Gmjx
} H);O. m
}, true); EMe3Xb
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} . \/jy]Y
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public int getCountByCriteria(final 2;!,:bFb
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DetachedCriteria detachedCriteria){ gG^A6Ol%D
Integer count = (Integer) Zq,[se'nh"
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getHibernateTemplate().execute(new HibernateCallback(){ n+ot. -
publicObject doInHibernate rt5FecX\
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(Session session)throws HibernateException { qM~;Q6{v
Criteria criteria = +>v3&[lGv
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detachedCriteria.getExecutableCriteria(session); rGNYu\\
return %
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criteria.setProjection(Projections.rowCount g>L4N.ZH_v
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()).uniqueResult(); QL_vWG-
} xEULV4Qw
}, true); }8joltf
return count.intValue(); C2l=7+X#W
} 2N)siH
} Rw
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用户在web层构造查询条件detachedCriteria,和可选的 9FGe(t<
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 *9XKkR<r
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PaginationSupport的实例ps。 CtEpS<*c
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ps.getItems()得到已分页好的结果集 !+<OED=qe
ps.getIndexes()得到分页索引的数组 f1Az|h
ps.getTotalCount()得到总结果数 m'j]T/WF
ps.getStartIndex()当前分页索引 T+a\dgd
ps.getNextIndex()下一页索引 t> ~a/K"
ps.getPreviousIndex()上一页索引 6\9
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 eNQQ`ll@m
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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 >EacXPt-O
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一下代码重构了。 FV 0x/)<z
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我把原本我的做法也提供出来供大家讨论吧: sxP1.= W
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首先,为了实现分页查询,我封装了一个Page类: }|KNw*h$
java代码: @zQ.d{
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/*Created on 2005-4-14*/ /i[1$/*
package org.flyware.util.page; b6]MJ0do
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/** ?3duW$`
* @author Joa ?o>JX.Nl&7
* B'AU~#d
*/ XABB6J]
publicclass Page { goMv8d
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/** imply if the page has previous page */ =%i~HDiy
privateboolean hasPrePage; uQ(C,f[6p
# $N)
/** imply if the page has next page */ uV|%idC
privateboolean hasNextPage; /QgU!:e
1M={8}3
/** the number of every page */ qV7F=1k]
privateint everyPage; VfV|fuW
cFV)zFu
/** the total page number */ ;Xr|['\'
privateint totalPage; u&E$(
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/** the number of current page */ Ic<J]+Xq
privateint currentPage; 8kRqF?rbj
{:%A
/** the begin index of the records by the current #Wf9`
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query */ u)hr
privateint beginIndex; f[XsnN2
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/** The default constructor */ SjmWlf,
public Page(){ 2[V9`r8*
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} +YX*.dW
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/** construct the page by everyPage LQo>wl
* @param everyPage xQ]^wT.Q
* */ #~JR_oQE!
public Page(int everyPage){ <@](uWu
this.everyPage = everyPage; c %f'rj
} v PJ=~*P=
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/** The whole constructor */ y@'~fI!E4
public Page(boolean hasPrePage, boolean hasNextPage, ,,Ia 4c
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int everyPage, int totalPage, Rf4}4ixkj
int currentPage, int beginIndex){ j@guB:0
this.hasPrePage = hasPrePage; (p1}i::Y8
this.hasNextPage = hasNextPage; b\.l!v n0
this.everyPage = everyPage; 8o7%qWX
this.totalPage = totalPage; 3
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this.currentPage = currentPage; !iHJ!
this.beginIndex = beginIndex; Z37%jdr
} l`b%imX
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