Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 3Hm7
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 deM~[1e[
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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 D9ywg/Q91
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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 slSR=XOG
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分页支持类: FR' b`Xv:
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java代码: p#M!S2&z
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package com.javaeye.common.util; Ai jUs*n 2
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import java.util.List; B*Cb6'Q
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publicclass PaginationSupport { 6bJ"$ o
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publicfinalstaticint PAGESIZE = 30; U]j&cFbn5_
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privateint pageSize = PAGESIZE; jf7pl8gv
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privateList items; Ty}R^cy{d
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privateint totalCount; 7xR|_+%~K
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privateint[] indexes = newint[0]; J=L`]XE
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privateint startIndex = 0; ./)j5M
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public PaginationSupport(List items, int 1Q_ ``.M
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totalCount){
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setPageSize(PAGESIZE); |QqWVelc
setTotalCount(totalCount); dAwS<5!
setItems(items); wL'C1Vr
setStartIndex(0); <
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} V*kznm
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public PaginationSupport(List items, int ;y,NC2Xj
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totalCount, int startIndex){ ,{TQ
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setPageSize(PAGESIZE); ,@,LD u
setTotalCount(totalCount); /W``LK>;?
setItems(items); }*ODM6
setStartIndex(startIndex); Z
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} z}mvX.j7
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public PaginationSupport(List items, int Cd9t{pQD4
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totalCount, int pageSize, int startIndex){ ,iohfZz
setPageSize(pageSize); eFes+i( 35
setTotalCount(totalCount); 5GUH;o1m
setItems(items); wz)m{:b<
setStartIndex(startIndex); =yo=q)W
} 4&H+hN{3
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publicList getItems(){ 0vcET(
return items; i~ROQMN1
} taBO4LV
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publicvoid setItems(List items){ @#1cx
this.items = items; I@+lFG
} ,$o-C&nC
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publicint getPageSize(){ (J/>Gy)d
return pageSize; NywB3
} r \9:<i8
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publicvoid setPageSize(int pageSize){ 69?I?,7
this.pageSize = pageSize; ~S!L!qY
} -aA<.+
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publicint getTotalCount(){ ?!_u,sT
return totalCount; YlG;A\]k
} [3GKPX:OA/
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publicvoid setTotalCount(int totalCount){ iczs8gj*
if(totalCount > 0){ z{@=_5;
this.totalCount = totalCount; A"`L~|&
int count = totalCount / %~ ;nlDw
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pageSize; ,7QBJ_-;QJ
if(totalCount % pageSize > 0) Bfu/9ad
count++; ![qRoYpbg8
indexes = newint[count]; fdg[{T4:
for(int i = 0; i < count; i++){ XlE$.
indexes = pageSize * osI- o~#>
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} u2f `|+1^y
}else{ bbM4A! N
this.totalCount = 0; .Y+mwvLpRG
} \-DM-NrZ1U
} sTJJE3TBI
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publicint[] getIndexes(){ U<1}I.hDJ
return indexes; +'!h-x1y~
} :17ee
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publicvoid setIndexes(int[] indexes){ iJ5e1R8tN
this.indexes = indexes; UeFtzty,a
} +k#mvPq
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publicint getStartIndex(){ 4u7c7K>\Y
return startIndex; m>g}IX&K'
} *G8'Fjin'T
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publicvoid setStartIndex(int startIndex){ Jv-zB]3&
if(totalCount <= 0) GZ;Z
this.startIndex = 0; <m-Ni
elseif(startIndex >= totalCount) hB?U5J
this.startIndex = indexes wn&[1gBxM
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[indexes.length - 1]; H0 {Mlu9
elseif(startIndex < 0) bWhJ^LD
this.startIndex = 0; bkJwP s
else{ >1_Dk7E0D
this.startIndex = indexes ?*B;514
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[startIndex / pageSize]; clij|?O
} VGq{y{(
} zS&7[:IRs'
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publicint getNextIndex(){ (or =f`
int nextIndex = getStartIndex() + qpH j4
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pageSize; Y}eZPG.h
if(nextIndex >= totalCount) ! hOOpZf7
return getStartIndex(); wWp?HDl"M
else RlG'|xaT
return nextIndex; |:`?A3^m#
} a,en8+r]
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publicint getPreviousIndex(){ C?_t8G./_
int previousIndex = getStartIndex() - V>~*]N^f
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pageSize; TXY
if(previousIndex < 0) AX!Md:s
return0; t!+%g) @
else 7$E2/@f
return previousIndex; C.B8 J"T-
} ;jpw"-J`
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} 8'
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抽象业务类 ur,V>J<5A
java代码: gK] T}
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/** [qc6Q:
* Created on 2005-7-12 z{<q0.^EFh
*/ dUBVp 9PB
package com.javaeye.common.business; :$) aMEq
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import java.io.Serializable; 2=/-d$
import java.util.List; zmrX%!CW
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import org.hibernate.Criteria; HzFt
import org.hibernate.HibernateException; ~a0d.dU
import org.hibernate.Session; 0|f_C3
import org.hibernate.criterion.DetachedCriteria; 8.
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import org.hibernate.criterion.Projections; 0^|$cvYiL
import }b\ipA,~
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org.springframework.orm.hibernate3.HibernateCallback; x&6i@ Jl
import 7D9h;gsP
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org.springframework.orm.hibernate3.support.HibernateDaoS Z:}2F^6
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upport; d3\l9R{}
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import com.javaeye.common.util.PaginationSupport; v@<lEG#$"|
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public abstract class AbstractManager extends P89Dg/P
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HibernateDaoSupport { f{oxF?|89
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privateboolean cacheQueries = false; bx'B;rZr
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privateString queryCacheRegion; +eVpMD(
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publicvoid setCacheQueries(boolean J>&dWKM3
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cacheQueries){ $;g%S0:3)
this.cacheQueries = cacheQueries; q0xE&[C[M
} Lu u-c<*M
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publicvoid setQueryCacheRegion(String 55)ep
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queryCacheRegion){ { U2|):
this.queryCacheRegion = EJ[iOYx
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queryCacheRegion; Ky{I&}+R|
} kK_>*iCMo
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publicvoid save(finalObject entity){ o::ymAj
getHibernateTemplate().save(entity); z8rh*Rfxd
} \ {E;u'F
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publicvoid persist(finalObject entity){ ;L/T}!Dx
getHibernateTemplate().save(entity); m'vOFP)'
} I$sm5oL
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publicvoid update(finalObject entity){ Ts ?>"@
getHibernateTemplate().update(entity); }j5@\c48
} I.n{ "=$B@
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publicvoid delete(finalObject entity){ Et[QcB3
getHibernateTemplate().delete(entity); hgMnO J
} .<|4PG
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publicObject load(finalClass entity, . KSr@Gz
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finalSerializable id){ S7~l%G>]b
return getHibernateTemplate().load nD{;4$xP`
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(entity, id); 5=;I|l,
} `J;/=tf09
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publicObject get(finalClass entity, !D]6Cq
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finalSerializable id){ c^/?VmCQ}
return getHibernateTemplate().get nV6g]#~@
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(entity, id); ;|e 0{Jrz
} I<o4 l[--
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publicList findAll(finalClass entity){ X2mm'JDwK
return getHibernateTemplate().find("from .J!
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" + entity.getName());
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} ?&bVe__
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publicList findByNamedQuery(finalString hdWp
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namedQuery){ \<+47+
return getHibernateTemplate pHbguoH,
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().findByNamedQuery(namedQuery); Gt*<?
} ,'0oj$~S:
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publicList findByNamedQuery(finalString query, T;e (Q,!H
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finalObject parameter){ V?pO ~qo
return getHibernateTemplate Bd]DhPhJ
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().findByNamedQuery(query, parameter); NNrZb?
} wUPywV1UO
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publicList findByNamedQuery(finalString query, MrjB[3Td
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finalObject[] parameters){ rMFf8D(Y
return getHibernateTemplate (N>ew)Ke
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().findByNamedQuery(query, parameters); a[9OtZX<
} uS10P7N}
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publicList find(finalString query){ iPL'JVPZ
return getHibernateTemplate().find K%#C+`Ij
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(query); %LaC$w_X
} N=q29JU
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publicList find(finalString query, finalObject [t\Mu}b
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parameter){ EJ|ZZYke!
return getHibernateTemplate().find !ZcALtq
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(query, parameter); 4o8HEq!
} M L_J<|,J
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public PaginationSupport findPageByCriteria -]MP,P%
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(final DetachedCriteria detachedCriteria){ .VV!$;
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return findPageByCriteria g5HqU2
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); oU6g5
} ~Q\uP(!D
{ J%$.D(/
public PaginationSupport findPageByCriteria f3&//h8
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(final DetachedCriteria detachedCriteria, finalint ^]K)V
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startIndex){ g5'bUYsa
return findPageByCriteria ^IZ0M1&W;
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(detachedCriteria, PaginationSupport.PAGESIZE, WkmS
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startIndex); 90I3_[Ii
} yUlQPrNX
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public PaginationSupport findPageByCriteria f}uCiV!?v
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(final DetachedCriteria detachedCriteria, finalint tHo/uW_~I
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pageSize, R-|]GqS}L
finalint startIndex){ P"VLGa
return(PaginationSupport) )y Y;%
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getHibernateTemplate().execute(new HibernateCallback(){ 2UJ0%k
publicObject doInHibernate id9T[^h
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(Session session)throws HibernateException { 0Jif.<
Criteria criteria = =ZL20<TeH
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detachedCriteria.getExecutableCriteria(session); 5qko`r@#
int totalCount = 0 pz
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((Integer) criteria.setProjection(Projections.rowCount
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()).uniqueResult()).intValue(); <6 $%Y2
criteria.setProjection ]<_+uciP5[
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(null); a}{! %5
List items = GDntGTE~sk
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criteria.setFirstResult(startIndex).setMaxResults |e(x< [s5
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(pageSize).list(); hQeZI+
PaginationSupport ps = ?uv%E*TU
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new PaginationSupport(items, totalCount, pageSize, #$QY[rf=6
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startIndex); 3E9j%sYk
return ps; CAO{$<M5m
} MQu6Tm H
}, true); ;I'["k%
} /y@iaptC
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public List findAllByCriteria(final tam/FzVw
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DetachedCriteria detachedCriteria){ ^5F/=TtE G
return(List) getHibernateTemplate wtyu"=
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().execute(new HibernateCallback(){ sP!qv"u
publicObject doInHibernate $r_ gFv
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(Session session)throws HibernateException { aKO@_R,:
Criteria criteria = f{oWd]eAhb
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detachedCriteria.getExecutableCriteria(session); s q$|Pad[
return criteria.list(); 6Rj
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} $x*GvI1D
}, true); rY.:}D
} ,j<"~"]
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public int getCountByCriteria(final x.Y,]wis
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DetachedCriteria detachedCriteria){ T~E83Jw
Integer count = (Integer) `}l%Am
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getHibernateTemplate().execute(new HibernateCallback(){ b iD7(AK
publicObject doInHibernate f
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(Session session)throws HibernateException { i:72FVo
Criteria criteria = 8!fwXm
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detachedCriteria.getExecutableCriteria(session); Tc:`TE=2
return AJmzg
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criteria.setProjection(Projections.rowCount \;<Y/sg
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()).uniqueResult(); y C#{nUdw
} 511q\w M
}, true); Heu@{t.[!D
return count.intValue(); xh$[E&2u
} ~c"c9s+o
} y-mmc}B>N
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用户在web层构造查询条件detachedCriteria,和可选的 TEtZPGFl
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 WD:5C3;
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PaginationSupport的实例ps。 V'B 6C#jT
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ps.getItems()得到已分页好的结果集 s#ykD{Z
ps.getIndexes()得到分页索引的数组 v)06`G
ps.getTotalCount()得到总结果数 l3,|r QD
ps.getStartIndex()当前分页索引 3 0Z;}<)9
ps.getNextIndex()下一页索引 P%c<0y"O:>
ps.getPreviousIndex()上一页索引 vEkz5$
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 6*E7}
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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 _F9
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一下代码重构了。 J{Jxb1:c
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我把原本我的做法也提供出来供大家讨论吧: 4{V=X3,x
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首先,为了实现分页查询,我封装了一个Page类: O;~1M3Ii
java代码: *7ox_ R@
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/*Created on 2005-4-14*/ b3ZPlLx6
package org.flyware.util.page; ?^5x
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/** Kf*+Ilq%L
* @author Joa <_5z^@N3$
* ?AEpg.9R-
*/ R[b?kT-%
publicclass Page { AbB%osz}Ed
>. A{=?
/** imply if the page has previous page */ 2&M
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privateboolean hasPrePage; UX6-{
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/** imply if the page has next page */ *k/_p^
privateboolean hasNextPage; jm!G@k6TA
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/** the number of every page */ vCJjZ%eO%D
privateint everyPage; :mij%nQ>$
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/** the total page number */ &wJ"9pQ~6E
privateint totalPage; plca`
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/** the number of current page */ WVVqH_
privateint currentPage; +XsY*$O
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/** the begin index of the records by the current Wl1%BN0>
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query */ c7'Pzb)'
privateint beginIndex; qhogcAvE
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/** The default constructor */ D,2,4h!ka
public Page(){ "|hmiMdGB
2`;
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} )|:|.`H
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/** construct the page by everyPage mesR)fTI
* @param everyPage ,E_hG3}}
* */ ]5^u^
public Page(int everyPage){ "ey~w=B$M
this.everyPage = everyPage; DpA)Z??
} A&z
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/** The whole constructor */ Cu}Rq!9i
public Page(boolean hasPrePage, boolean hasNextPage, `.n[G~*w~1
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int everyPage, int totalPage, # H4dmnV
int currentPage, int beginIndex){ ruoiG?:T
this.hasPrePage = hasPrePage; ex-`+cF
this.hasNextPage = hasNextPage; b*$^8%
this.everyPage = everyPage; }hGbF"clqg
this.totalPage = totalPage; 419t"1b
this.currentPage = currentPage; L%!jj7,9-
this.beginIndex = beginIndex; #CM2FN:W
} h5F1mr1Sa
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/** D.RHvo~6
* @return e%8K
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* Returns the beginIndex. 3o6N&bQ b
*/ Qq5)|m
publicint getBeginIndex(){ ]R0^
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return beginIndex; Q?vGg{>
} ifuVV Fov
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/** C6GYhG]
* @param beginIndex SwQb"
* The beginIndex to set. +&|WC2#
*/ zF{5!b
publicvoid setBeginIndex(int beginIndex){ srUpG&Bcx
this.beginIndex = beginIndex; K{N#^L!
} mI}'8.
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/** @n<WM@|l
* @return B;^7Yu0,
* Returns the currentPage. Ix"uk6 h
*/ D>05F,a
publicint getCurrentPage(){ Ucv-}oa-?
return currentPage; `6UW?1_Z5
} 9hcZbM]
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/** F`f#gpQ
* @param currentPage R7+k=DI
* The currentPage to set. !
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*/ e%"L79Of6)
publicvoid setCurrentPage(int currentPage){ ceAK;v
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this.currentPage = currentPage; lv,<[Hw1
} <jfi"SJu
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/** {4UlJ,Z.n
* @return "#(]{MY
* Returns the everyPage. IS"UBJ6p
*/ Yk[yG;W
publicint getEveryPage(){ 9;kWuP>k4u
return everyPage; 'R= r9_%
} -]HO8}-Rjs
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/** )t0t*xu#
* @param everyPage jRzR`>5
* The everyPage to set. .BZw7
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*/ (1*?2u*j
publicvoid setEveryPage(int everyPage){ v@[MX- ,8
this.everyPage = everyPage; TR|G4l?
} %
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/** Ry tQNwv3
* @return qd"*Td
* Returns the hasNextPage. \3Ys8umKq
*/ |0BmEF
publicboolean getHasNextPage(){ ,0;E_i7
return hasNextPage; t/pHdxX*C7
} rJ K~kKG
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/** Jt@7y"<
* @param hasNextPage gQ h;4v
* The hasNextPage to set. [[ HXOPaV
*/ )9==6p
publicvoid setHasNextPage(boolean hasNextPage){ 27}k63 \
this.hasNextPage = hasNextPage; S-g`rTx
} $wAVM/u&
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/** W%@6D|^
* @return |v:8^C7
* Returns the hasPrePage. d'J))-*#UO
*/ qVx0VR1:
publicboolean getHasPrePage(){ *[k7KG2_U
return hasPrePage; _"Y;E
} (WX,&`a<$
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/** I"y=A7Nq
* @param hasPrePage OiZPL" Q(K
* The hasPrePage to set. -(@dMY
*/ "EDn;l-Q
publicvoid setHasPrePage(boolean hasPrePage){ p~En~?<
this.hasPrePage = hasPrePage; 3T%WfS+
} 8 }nA8 J
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/** 3;@t{rIin
* @return Returns the totalPage. 6(VCQ{
* ;VNwx(1l`
*/ W_ngB[
publicint getTotalPage(){ ^;!A`t
return totalPage; G/bWn@
} `dx+Qp
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/** :TxfkicN\
* @param totalPage M8Q-x-7
* The totalPage to set. :;#Kg_bz
*/ L00,{g6wqb
publicvoid setTotalPage(int totalPage){ $*{PUj
this.totalPage = totalPage; o
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} ;a*i*{\Rm
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} @I_A\ U{
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