Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ) inhPd
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 )pELCk
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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 7 $AEh+f
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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 9ReH@5_bGM
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。 (s`oJLW>
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分页支持类: yM}b
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java代码: WrWJ!
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package com.javaeye.common.util; Ws2SD6!4`
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import java.util.List; P>q"P1&{
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publicclass PaginationSupport { W+N9~.q\^
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publicfinalstaticint PAGESIZE = 30; "o"ujQ(v
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privateint pageSize = PAGESIZE; TTB1}j+V6
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privateList items; H{}0-0o
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privateint totalCount; lFvRXV^+f
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privateint[] indexes = newint[0]; mY[s2t
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privateint startIndex = 0; ACQbw)tiv}
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public PaginationSupport(List items, int m=;0NLs4
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totalCount){ Z(g9rz']0
setPageSize(PAGESIZE); Fh t$7V
setTotalCount(totalCount); Z#H] yG
setItems(items); q:2V w`g'
setStartIndex(0); $r0~&$T&
} x\HHu]
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public PaginationSupport(List items, int Bqo8G->
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totalCount, int startIndex){ (pY'v/ a-
setPageSize(PAGESIZE); FtBYPSGz
setTotalCount(totalCount); "{a-I=s\C
setItems(items); Vy*&po[
setStartIndex(startIndex); Ph[P$: 9
} :0K[fBa
fa#xEWaFr
public PaginationSupport(List items, int b(@[Y(_R
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totalCount, int pageSize, int startIndex){ oy+`` W~
setPageSize(pageSize); "$)Nd+ny
setTotalCount(totalCount); y k=o
setItems(items); QEd>T"@g
setStartIndex(startIndex); 'C=8. P?
} r2:n
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publicList getItems(){ GS),rNBur
return items; "r@f&Ssxb
} G55-{y9Q
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publicvoid setItems(List items){ ( `V
this.items = items; FFE IsB"9
} fAx7_}k/ m
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publicint getPageSize(){ I_vPGafMx
return pageSize; ;Y:_}kN8_
} c,WRgXL
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publicvoid setPageSize(int pageSize){ #is1y3yh
this.pageSize = pageSize; $|0_[~0-n
} :^
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publicint getTotalCount(){ WxNPAJ6YH
return totalCount; 6k?,'&z|~
} ^a9v5hu
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publicvoid setTotalCount(int totalCount){ >:5^4/fo*
if(totalCount > 0){ \W^Mo>l
this.totalCount = totalCount; <sXmk{
int count = totalCount / w&6c`az8
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pageSize; Koh`|]N
if(totalCount % pageSize > 0) @8[3]<
count++;
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indexes = newint[count]; x9fNIuAQ
for(int i = 0; i < count; i++){ RRYm.dMIw
indexes = pageSize * `o7m)T')
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i; :\
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} 6U{&`8C
}else{ IfyyA
this.totalCount = 0; 4 [@`j{
} j8lWra\y
} -b1VY4m-
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publicint[] getIndexes(){ ,`<w#
return indexes; lWYZAF>?Ym
} ]<3$Sx_{y
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publicvoid setIndexes(int[] indexes){ AEjkqG4qv
this.indexes = indexes; 5)=XzO0
} Z4eu'.r-y~
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publicint getStartIndex(){ VUfV=&D-*g
return startIndex; FScE3~R
} Q4YIKNN|7
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publicvoid setStartIndex(int startIndex){ vIk;x
if(totalCount <= 0) ,^dyS]!d$
this.startIndex = 0; & <{=
elseif(startIndex >= totalCount) YuO-a$BP
this.startIndex = indexes JXR_klx
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[indexes.length - 1]; A]VcQ_e
elseif(startIndex < 0) C)2Waj}
this.startIndex = 0; JaC
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else{ :5/P{Co(
this.startIndex = indexes k!/"J
;
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[startIndex / pageSize]; 8"2
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} 6#NptXB
} XwlAW7lU=
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publicint getNextIndex(){ cE7xNZ;Bh
int nextIndex = getStartIndex() + FB<#N+L\
zB 6u%u WR
pageSize; yGN@Hd:9
if(nextIndex >= totalCount) ^X$k<n A;
return getStartIndex(); X2
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else 7%aaqQ1T
return nextIndex; 5<-_"/_
} ]ZkhQ%
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publicint getPreviousIndex(){ uo`O$k<;
int previousIndex = getStartIndex() - Mx,QgYSu
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pageSize; _c}@Fi+E
if(previousIndex < 0) R-Y |;
return0; ; aA,H&
else ,Lt+*!;m
return previousIndex; -i``yf?P
} -eKi}e
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} P19nF[A
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抽象业务类 hdB.u^!
java代码: a9rn[n1Q
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/** v3 $+l1
* Created on 2005-7-12 `I$'Lp#5
*/ "eWN52
package com.javaeye.common.business; a`.] 8Jy)
; z_ZZ(W
import java.io.Serializable;
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import java.util.List; z@E-pYV
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import org.hibernate.Criteria; 57/9i>
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import org.hibernate.HibernateException; J)O1)fR
import org.hibernate.Session; @WIcH:_w-
import org.hibernate.criterion.DetachedCriteria; (eS/Q%ZGK
import org.hibernate.criterion.Projections; KjR^6v
import +QcgLq
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org.springframework.orm.hibernate3.HibernateCallback; %mR roR6
import (P;z*
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org.springframework.orm.hibernate3.support.HibernateDaoS 8y;W+I(71
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upport; Kfnn;
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import com.javaeye.common.util.PaginationSupport; Kg0Vbzvb
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public abstract class AbstractManager extends %1Gat6V<'
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HibernateDaoSupport { a\an
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privateboolean cacheQueries = false; uWw4l"RK`
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privateString queryCacheRegion; +5pK[%k
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publicvoid setCacheQueries(boolean @NMFurm
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cacheQueries){ ^p#f B4z
this.cacheQueries = cacheQueries; ra\Moy
} mG[S"?C
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publicvoid setQueryCacheRegion(String Pf
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queryCacheRegion){ [9f
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this.queryCacheRegion = \-kX-Tq
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queryCacheRegion; r(` ;CY]@
} wD>tR
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publicvoid save(finalObject entity){ ;2"#X2B
getHibernateTemplate().save(entity); l1^/Q~u
} %lZ++?&^
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publicvoid persist(finalObject entity){ KE\p|X i
getHibernateTemplate().save(entity); &.ZW1TxE8
} "@!z+x[8
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publicvoid update(finalObject entity){ ]@OGp:Hz
getHibernateTemplate().update(entity); mIVnc`3s
} P<b.;Oz__-
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publicvoid delete(finalObject entity){ |fdr\t#'~
getHibernateTemplate().delete(entity); }^uUw&
} "Y@rNmBj
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publicObject load(finalClass entity, kR%bdN
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finalSerializable id){ UF)rBAv(/
return getHibernateTemplate().load Zd@'s.,J
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(entity, id); IuDg-M[
} 0T 2h3,
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publicObject get(finalClass entity, $,ev <4I&
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finalSerializable id){ A#~"Gp
return getHibernateTemplate().get $Gb] K{e
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(entity, id); |+Z,
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} Ms5m.lX
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publicList findAll(finalClass entity){ FUzIuz 6
return getHibernateTemplate().find("from iorKS+w"
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" + entity.getName()); ,j
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} rDkAeX0
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publicList findByNamedQuery(finalString Z!Sv/5xx
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namedQuery){ \3dMA_5
return getHibernateTemplate evf){XhT;n
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().findByNamedQuery(namedQuery); ty]JUvR@
} =W)Fa6P3j(
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publicList findByNamedQuery(finalString query, JDv7jy
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finalObject parameter){ M.1bRB
return getHibernateTemplate ]Po9a4w#
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().findByNamedQuery(query, parameter); FRI<A8
} 9
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publicList findByNamedQuery(finalString query, ey<u
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finalObject[] parameters){ 6Uq@v8mh
return getHibernateTemplate quc?]rb
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().findByNamedQuery(query, parameters); 6N(Wv0b $
} 3F2> &p|7
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publicList find(finalString query){ flTK
return getHibernateTemplate().find pc&/'zb
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(query); Z"Z&X0Oj
} F7J-@T<
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publicList find(finalString query, finalObject "|RP_v2
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parameter){ P(G$@},W
return getHibernateTemplate().find r AMnM>`
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(query, parameter); ?H1I,]Di
} Acr\2!))
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public PaginationSupport findPageByCriteria r/=v;4.W
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(final DetachedCriteria detachedCriteria){ b_-ESs]g
return findPageByCriteria +<6L>ZAL
# 'G/&&<
(detachedCriteria, PaginationSupport.PAGESIZE, 0); Z@&_ T3M
} rz+G]J
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public PaginationSupport findPageByCriteria Woa5Ov!n0
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(final DetachedCriteria detachedCriteria, finalint s$6zA
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startIndex){ ]]@jvU_?kS
return findPageByCriteria ])}{GW
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(detachedCriteria, PaginationSupport.PAGESIZE, W3*BdpTw
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startIndex); Yo;/7gG>
} t,=
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public PaginationSupport findPageByCriteria T+NEw8C?/
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(final DetachedCriteria detachedCriteria, finalint Nkn0G_
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pageSize, 5%(J +d
finalint startIndex){ Da1BxbDeI
return(PaginationSupport) =[(1u|H9
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getHibernateTemplate().execute(new HibernateCallback(){ Qi2yaEB
publicObject doInHibernate 1"A1bK
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(Session session)throws HibernateException { S6,AY(V
Criteria criteria = ;YNN)P%"
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detachedCriteria.getExecutableCriteria(session); jV8mn{<
int totalCount = +`9
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((Integer) criteria.setProjection(Projections.rowCount k:s}`h_n
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()).uniqueResult()).intValue(); WK0?$[|=r
criteria.setProjection .Br2^F
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(null); B)/X:[
List items = m9Gyjr'L
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criteria.setFirstResult(startIndex).setMaxResults )5gcLD/zI
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(pageSize).list(); 6kGIO$xJ)
PaginationSupport ps = 1qbd6D|t
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new PaginationSupport(items, totalCount, pageSize, GjE/!6b
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startIndex); [ik D4p=
return ps;
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} '?t]iRCeI7
}, true); [J\5DctX;c
} |xQG
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public List findAllByCriteria(final pez*kU+9
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DetachedCriteria detachedCriteria){ <M nzR
return(List) getHibernateTemplate 6#vD>@H
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().execute(new HibernateCallback(){ I?dh"*Js&
publicObject doInHibernate rtv\Pf|
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(Session session)throws HibernateException { Ks@S5:9sp
Criteria criteria = \D?6_
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detachedCriteria.getExecutableCriteria(session); B<DvH"+$
return criteria.list(); ~[Mk QJxe
} (ZQ{%-i?qR
}, true); kU_bLC?>D
} \2-!%i,
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public int getCountByCriteria(final irqlU
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DetachedCriteria detachedCriteria){ 5[`!\vCiZ
Integer count = (Integer) 9X,dV7 yW
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getHibernateTemplate().execute(new HibernateCallback(){ 8U0y86q>)E
publicObject doInHibernate AOWX=`J8V
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(Session session)throws HibernateException { ZJsc ?*@
Criteria criteria = wfM$JYfI
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detachedCriteria.getExecutableCriteria(session); N\=pH{
return ?'CIt5n+\{
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criteria.setProjection(Projections.rowCount ()JM161
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()).uniqueResult(); bM_Y(TgJ
} f%ZqK_CW
}, true); H:#b(&qw2
return count.intValue(); )+wBS3BC
} 4LtFv)i
} wblEx/FqE^
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用户在web层构造查询条件detachedCriteria,和可选的 Dk&cIZ43
);@Dr!H
startIndex,调用业务bean的相应findByCriteria方法,返回一个 E:4`x_~qQ
~Lhq7;=H?O
PaginationSupport的实例ps。 ~l}rYi>g%
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ps.getItems()得到已分页好的结果集 e{:P!r
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ps.getIndexes()得到分页索引的数组 vi4u `
ps.getTotalCount()得到总结果数 2al%J%
ps.getStartIndex()当前分页索引 i&-g 0
ps.getNextIndex()下一页索引 n*CH,fih:
ps.getPreviousIndex()上一页索引 {#:js
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 VxLq,$B76
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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 w3 PE.A"Q
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一下代码重构了。 b(_PCVC
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我把原本我的做法也提供出来供大家讨论吧: bRJYw6oA<
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首先,为了实现分页查询,我封装了一个Page类: SOE#@{IXBa
java代码: <_uLf9ja
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/*Created on 2005-4-14*/ m 8rKH\FD}
package org.flyware.util.page; l2+qP{_4
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/** @L {x;
* @author Joa + G"=1sxJ
* as)2ny! u
*/ /gL(40
publicclass Page { 49bzHEqZ
!(*mcYA*W
/** imply if the page has previous page */ x|_%R
v
privateboolean hasPrePage; zPe4WE|
/[Vaf R!
/** imply if the page has next page */ (BVLlOo?J
privateboolean hasNextPage; M-K<w(,X
'C1=(PE%`
/** the number of every page */ ~&CaC
privateint everyPage; Ra'0 ^4t
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/** the total page number */ eQx9Vnb
privateint totalPage; @(JcM=
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/** the number of current page */ VFT
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privateint currentPage; Vpt)?];P
VW<s_
/** the begin index of the records by the current !X(Lvt/
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query */ 3uwu}aw
privateint beginIndex; Z_QSVH68A
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/** The default constructor */ -TU7GCb=
public Page(){ }IC$Du#
r[vMiVb
} A-~#ydv
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/** construct the page by everyPage iJ~5A'?6
* @param everyPage v!E0/
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* */ E8T4Nh_
public Page(int everyPage){ @b=tjQO_
this.everyPage = everyPage; c ^G\w+_
} r) T^ Td1
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/** The whole constructor */ <^UB@'lCm
public Page(boolean hasPrePage, boolean hasNextPage, 9U>ID{
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int everyPage, int totalPage, 5~<>h~yJ
int currentPage, int beginIndex){ )-Zpr1kD
this.hasPrePage = hasPrePage; 6TbDno/!'
this.hasNextPage = hasNextPage; F@kOj*5,[
this.everyPage = everyPage; fGcAkEstT!
this.totalPage = totalPage; d@b 0z$<s
this.currentPage = currentPage; tE]g*]o
this.beginIndex = beginIndex; ,ZJI]Q=!
} COOazXtW
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/** 'X_iiR8n@p
* @return @z EEX9U
* Returns the beginIndex. Y$--Hp4
*/ c,Zs.
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publicint getBeginIndex(){ JS642T
return beginIndex; e!l!T@
pf
} aa_&WHXkt
hQ i[7r($8
/** 2xZg, \
* @param beginIndex t^&:45~Q
* The beginIndex to set. Oo`P +S#
*/ (s
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publicvoid setBeginIndex(int beginIndex){ i92{N$*x
this.beginIndex = beginIndex; kI<C\*N
} ^LfCLI9Z
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/** $N5VoK
* @return k)'hNk"x
* Returns the currentPage. iv?'&IUfK
*/ i6kW"5t
publicint getCurrentPage(){ Y)N(uv6
return currentPage; y rdJX
} +o?.<[>!GR
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/** weT33O"!1
* @param currentPage HyiuU`
* The currentPage to set. VD,F?L!
*/ &"._%S58V
publicvoid setCurrentPage(int currentPage){ yH|ucN~k5S
this.currentPage = currentPage; T73oW/.0X?
} ZF51|b
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/** f/Grem
* @return NO
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* Returns the everyPage. G`R Ed-Z[
*/ W:3u$LTf*f
publicint getEveryPage(){ b5_A*-s$M
return everyPage; 4adCMfP7.
} :)c >5
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/** tRS^|??
* @param everyPage Ve2z= 6(
* The everyPage to set. ,YSQog
*/ k1L GT&
publicvoid setEveryPage(int everyPage){ }Tu_?b`RUm
this.everyPage = everyPage; n #p6i
} Gc~A,_(
8!TbJVR
/** 2K..
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* @return #dqZdj@
* Returns the hasNextPage. HLN rI0
*/ 29Kuq ;6
publicboolean getHasNextPage(){ 2
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return hasNextPage; y`E2IE2o
} L(PJ9wjkD
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/** vPi\ vU{
* @param hasNextPage (
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* The hasNextPage to set. #"O9\X/B
*/ O!d^v9hM,
publicvoid setHasNextPage(boolean hasNextPage){ x-nwo:OA
this.hasNextPage = hasNextPage; 9'3bzhT$
} +DF<o
U~
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/** -v&Q'a
* @return MCurKT<pQ
* Returns the hasPrePage. 1ScfX\F=
*/ BNyDEFd
publicboolean getHasPrePage(){ T)3#U8sT
return hasPrePage; MQQiQ 2
} GL@s~_;T6
0+/L?J3
/** <z#r3J
* @param hasPrePage C0 .Xp
* The hasPrePage to set. c500:OSB
*/ To]WCFp6@
publicvoid setHasPrePage(boolean hasPrePage){ j6/ 3p|E
this.hasPrePage = hasPrePage; k5w+{iOh
} |QAmN>7U
8<^[xe
/** zO2<Igb
* @return Returns the totalPage. %p/Qz|W
* nkS6A}i3o
*/ (^qcX;-
publicint getTotalPage(){ *7ap[YXZ\w
return totalPage; 8ji!FZf
} pP{b!1
e:AB!k^xp$
/** >7vSN<w~m
* @param totalPage -hQ=0h~\B.
* The totalPage to set. 7vNS@[8
*/ ^dZ,Itho
publicvoid setTotalPage(int totalPage){ g|"z'_
this.totalPage = totalPage; ) OZDq]mV
} p J+>qy5
A7VF
>{L./
} T >g1!
-^
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O5_[T43
eP&K]#
; y=w :r\A
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 Oq*a4_R'YV
.NCQiQ
个PageUtil,负责对Page对象进行构造: aZ5qq+1x
java代码: EQ?4?
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4d!&.Qo9
/*Created on 2005-4-14*/ A~*Wr+pv
package org.flyware.util.page; >8t(qM-~:
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import org.apache.commons.logging.Log; ovm*,La)g
import org.apache.commons.logging.LogFactory; |1J "r.K
~i))Zc3,g\
/** m1\>v?=K
* @author Joa T1n GBl\(
* {EW}Wd
*/ }mu8fm'
publicclass PageUtil { dam.D.o"
U!3nn#!yE
privatestaticfinal Log logger = LogFactory.getLog 6XFO@c}d
[<wy@W
(PageUtil.class); /PPk
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#kLM=a/_NO
/** bTO$B2eh|
* Use the origin page to create a new page d`({z]W;
* @param page *'d5~dz=
* @param totalRecords <u4GIi
<sm
* @return &bBp`h
*/ h=`rZC
publicstatic Page createPage(Page page, int lba*&j]w=
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totalRecords){ eC[g"Ef
return createPage(page.getEveryPage(), o|^0DYb
1 68U-<
page.getCurrentPage(), totalRecords); F
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} oJ6
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/** "Hgn2o.;5
* the basic page utils not including exception "q#(}1Zd
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handler N#T MU
* @param everyPage ~+CNED0z+
* @param currentPage 8f8+3
* @param totalRecords KO{}+~,.6
* @return page Kz$Ijj
*/ +Tq
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publicstatic Page createPage(int everyPage, int ip1jY!
bpUN8BI[T
currentPage, int totalRecords){ ;pAkdX&b