Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 $<cZ<g5)
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 )sf~l6
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 f}X8|GlBo
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 .( h$@|Y
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分页支持类: |y%].y)
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java代码: QYgN39gp
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package com.javaeye.common.util; U
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import java.util.List; 2<G1'7)
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publicclass PaginationSupport { %vt SeJ
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publicfinalstaticint PAGESIZE = 30; n[Iu!v\/*
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privateint pageSize = PAGESIZE;
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privateList items; <cv1$
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privateint totalCount; +MZO%4
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privateint[] indexes = newint[0]; wDSUMB<?
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privateint startIndex = 0; 6b]d|
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public PaginationSupport(List items, int %lJiM`a
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totalCount){ Ws*PMK.0
setPageSize(PAGESIZE); k!/_/^{
setTotalCount(totalCount); A>t!/_"
setItems(items); %?oU{KzQ@;
setStartIndex(0); %<C
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} };m7FO
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public PaginationSupport(List items, int s`iNbW="
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totalCount, int startIndex){ !@Sf>DM"
setPageSize(PAGESIZE); >?9 WeXG
setTotalCount(totalCount); {,f!'i&b@
setItems(items); 6G<Hi"I
setStartIndex(startIndex); RpXs3=9
} !+A"Lej
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public PaginationSupport(List items, int UI<PNQvo9
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totalCount, int pageSize, int startIndex){ ]v@ tZ}
setPageSize(pageSize); &&9c&xgzE
setTotalCount(totalCount); 'hlB;z|T
setItems(items); k~jKJb-_
setStartIndex(startIndex); j,56Lh%1
} ui56<gI-
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publicList getItems(){ f1Yv hvWL
return items; g;-+7ViIr
} F/h :&B:;
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publicvoid setItems(List items){ kg?T$}O
this.items = items; :nKsZ1b X
} ?b@q5Y
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publicint getPageSize(){ uq|vNLW26
return pageSize; vzyN c'
} =MJ-s;raq
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publicvoid setPageSize(int pageSize){ *CH!<VB/
this.pageSize = pageSize; ?v"K1C1.
} hB
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publicint getTotalCount(){ u+mjguIv
return totalCount; C,|nmlDN
} "$~}'`(]
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publicvoid setTotalCount(int totalCount){ %Ye)8+-
if(totalCount > 0){ :jk)(=^
this.totalCount = totalCount;
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int count = totalCount / yD3bl%uZ
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pageSize; o%V
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if(totalCount % pageSize > 0) OX)#F'Sl}
count++; < v|%K.yd
indexes = newint[count]; 4i_spF-3
for(int i = 0; i < count; i++){ ;g:
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indexes = pageSize * _l24Ba$F6
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} --in+
}else{ Iz6ss(UJ
this.totalCount = 0; v%H"_T
} .mvB99P{<
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publicint[] getIndexes(){ wXr>p)mP
return indexes; i{TIm}_\
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publicvoid setIndexes(int[] indexes){ e1^fUOS
this.indexes = indexes; ?!bd!:(N
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publicint getStartIndex(){ =E&b=
return startIndex; u|(Ux~O
} Sp 7u_Pq{
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publicvoid setStartIndex(int startIndex){ pTcbq
if(totalCount <= 0) 8 ne/=N|,
this.startIndex = 0; >F/XZC
elseif(startIndex >= totalCount) ctp?y
this.startIndex = indexes mbF(tSy
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[indexes.length - 1]; vTpStoUM
elseif(startIndex < 0) 25aNC;J
this.startIndex = 0; *R5`.j =
else{ ~V @;(_T
this.startIndex = indexes y&1%1 #8F
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[startIndex / pageSize]; 2$M,*Dnr
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} '9 'l=Sh
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publicint getNextIndex(){ *dN N<
int nextIndex = getStartIndex() + &B}Lo
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pageSize; 2R~6<W+&:>
if(nextIndex >= totalCount) C`)_i3
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return getStartIndex(); yk<VlS
else @|BD|{k
return nextIndex; ZT6V/MD7T.
} }<=3W5+
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publicint getPreviousIndex(){
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int previousIndex = getStartIndex() - W@^J6sH
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pageSize; !x7o|l|cP
if(previousIndex < 0) w#&z]O9r
return0; RAV^D.
else bw9
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return previousIndex; :s"2Da3B
} C,"=}z1P
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抽象业务类 Q ]"jD#F
java代码: K\(6rS}N
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/** i6Qb[\;
* Created on 2005-7-12 -w]/7cH
*/ IE;\7r+h
package com.javaeye.common.business; Ns<?b;aK
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import java.io.Serializable; rLzW`
import java.util.List; qfYG.~`5
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import org.hibernate.Criteria; uE`r /=4
import org.hibernate.HibernateException; .x-J44i@/
import org.hibernate.Session; u1^\MVO8
import org.hibernate.criterion.DetachedCriteria; $7NCb7%/L
import org.hibernate.criterion.Projections; vk'rA{x
import jO8X:j09A
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org.springframework.orm.hibernate3.HibernateCallback; HCj>,^<h
import ubbnFE&PD
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org.springframework.orm.hibernate3.support.HibernateDaoS I9&lO/c0
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upport; oa`#RC8N
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import com.javaeye.common.util.PaginationSupport; ,mKObMu
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public abstract class AbstractManager extends +sf .PSz$
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HibernateDaoSupport { OlY$v@|
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privateboolean cacheQueries = false; ,j178EX
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privateString queryCacheRegion; O/b+CSS1
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publicvoid setCacheQueries(boolean 9v?l
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cacheQueries){ N3%*7{X
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this.cacheQueries = cacheQueries; q
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} ,_ .v_
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publicvoid setQueryCacheRegion(String LFf`K)q
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queryCacheRegion){
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this.queryCacheRegion = {mTytT
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queryCacheRegion; lzhqcL"
} ub K7B |p
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publicvoid save(finalObject entity){ _}gtcyx
getHibernateTemplate().save(entity); BRv x[u
} BVpO#c~I
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publicvoid persist(finalObject entity){ k'3Wt*i
getHibernateTemplate().save(entity); )r tomp:X
} GTl
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publicvoid update(finalObject entity){ _$s> c!t,#
getHibernateTemplate().update(entity); D(]E/k@;~
} YY5!_k
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publicvoid delete(finalObject entity){ z-T{~{q
getHibernateTemplate().delete(entity); v]VWDT
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} 7h9U{4r: M
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publicObject load(finalClass entity, $XnPwOj
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finalSerializable id){ qxOi>v0\H
return getHibernateTemplate().load 0JjUAxNq
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(entity, id); 5*-3?
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} +9;2xya2
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publicObject get(finalClass entity, 9pKGr@ &
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finalSerializable id){ 3L5r*fa
return getHibernateTemplate().get x.mrCJn)
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(entity, id); 9ooY?J
} {R6HG{"IS6
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publicList findAll(finalClass entity){ D<$XyP
return getHibernateTemplate().find("from 5*g]qJF
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} 8+Llx
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publicList findByNamedQuery(finalString dEa<g99[?
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namedQuery){ >w6taX
return getHibernateTemplate ~Ou1WnmO
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().findByNamedQuery(namedQuery); \c,pEXG
} "_UdBG
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publicList findByNamedQuery(finalString query, QF2q^[>w6
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finalObject parameter){ Fh|#u:n
return getHibernateTemplate [(kB
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publicList findByNamedQuery(finalString query, y;cUl, :v
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finalObject[] parameters){ N7r_77%m0
return getHibernateTemplate r;>+)**@vl
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().findByNamedQuery(query, parameters); [jdFA<Is
} Wm~` ~P
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publicList find(finalString query){ +yob)%
return getHibernateTemplate().find 620%Z*
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(query); Gl %3XdU
} U6ZR->:
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publicList find(finalString query, finalObject 1LJuCI=~
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parameter){ 8b.u'r174
return getHibernateTemplate().find Lf([dE1
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(query, parameter); YYEJph@06q
} hRI"y":zD
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public PaginationSupport findPageByCriteria PP~rn fE
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(final DetachedCriteria detachedCriteria){ {CG_P,FO
return findPageByCriteria <$w?/y/'
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); iI@jZVk
} H7Uli]e3
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public PaginationSupport findPageByCriteria <^~FLjsfg
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(final DetachedCriteria detachedCriteria, finalint +MbIB&fRCB
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startIndex){ XoLJ L]+?
return findPageByCriteria $WYbm}j
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(detachedCriteria, PaginationSupport.PAGESIZE, [%50/_h
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startIndex); hmx=
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} KfBTL!0#
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public PaginationSupport findPageByCriteria #j#_cImE
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(final DetachedCriteria detachedCriteria, finalint x\&`>>uA
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pageSize, ms($9 Lv/
finalint startIndex){ Wk:hFHs3
return(PaginationSupport) i,V;xB2
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getHibernateTemplate().execute(new HibernateCallback(){ ,*4p?|A
publicObject doInHibernate V._6=ZJ
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(Session session)throws HibernateException { 4`Q3v4fOF
Criteria criteria = lPLz@Up~
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detachedCriteria.getExecutableCriteria(session); ve
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int totalCount = nd;fy$<J\
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((Integer) criteria.setProjection(Projections.rowCount y%sroI('y
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()).uniqueResult()).intValue(); w;Q;[:y
criteria.setProjection c PgfTT
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(null); Auy_K?he]
List items = ZcuA6#3B
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criteria.setFirstResult(startIndex).setMaxResults QKN<+,h!z>
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(pageSize).list(); =#mTfJ
PaginationSupport ps =
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new PaginationSupport(items, totalCount, pageSize, #j@71]GI
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startIndex); mh<=[J,%p
return ps; eI1GXQ%
} aNyvNEV3C
}, true); ^xf<nNF:p
} axHK_1N{
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public List findAllByCriteria(final 0y<wvLv2C
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DetachedCriteria detachedCriteria){ R*|LI
return(List) getHibernateTemplate Z~A@o""F
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().execute(new HibernateCallback(){ [^8n0{JiN
publicObject doInHibernate e]=!"nJ+
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(Session session)throws HibernateException { 3nY1[,
Criteria criteria = }HE6aF62O
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detachedCriteria.getExecutableCriteria(session); JFgoN,xn
return criteria.list(); .(J?a"
} iHf-{[[Z
}, true); {pb>$G:gfx
} /7!""{1\\
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public int getCountByCriteria(final 6t/`:OZC:
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DetachedCriteria detachedCriteria){ 9 Pw0m=4
Integer count = (Integer) H
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getHibernateTemplate().execute(new HibernateCallback(){ #,{+3Y&5-+
publicObject doInHibernate >NB?&|
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(Session session)throws HibernateException { H:p Z-v*
Criteria criteria = fYE(n8W3
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detachedCriteria.getExecutableCriteria(session); 1FtM>&%4
return uxg9yp@|
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criteria.setProjection(Projections.rowCount v(OBXa9
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()).uniqueResult(); -@>BHC
} <
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}, true); "RVcA",
return count.intValue(); X7L8h'(@
} OT^%3:zg
} B3Jgd,[
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用户在web层构造查询条件detachedCriteria,和可选的 _2b tfY1U
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 4@.|_zY
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PaginationSupport的实例ps。 iTW? W\d
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ps.getItems()得到已分页好的结果集 %AOIKK5
ps.getIndexes()得到分页索引的数组 8G>>i)Sbg
ps.getTotalCount()得到总结果数 vpPl$ga5bY
ps.getStartIndex()当前分页索引 7u\*_mrv
ps.getNextIndex()下一页索引 x\2?ym@
ps.getPreviousIndex()上一页索引 KRJLxNr
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 bslrqUk_`=
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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 /ug8]Lo0
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一下代码重构了。 ?j^=u:<
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我把原本我的做法也提供出来供大家讨论吧: C@N1ljXJT
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首先,为了实现分页查询,我封装了一个Page类: 8 i&_Jgmr
java代码: ,:+dg(\r
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/*Created on 2005-4-14*/ BQ^H? jo
package org.flyware.util.page; JO14KY*%
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/** ?)'~~@NkH
* @author Joa 39{{7(hh
* B7\k< Nit0
*/ I *c;H I
publicclass Page { 0'&X
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/** imply if the page has previous page */ gBu1QviU
privateboolean hasPrePage; z9W`FBg
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/** imply if the page has next page */ ~f|Z%&l|
privateboolean hasNextPage; !h&g7do]Z
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/** the number of every page */ lq.Te,Y%w
privateint everyPage; @eqeN9e
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/** the total page number */ )o!XWh
privateint totalPage; 5=(c%
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/** the number of current page */ z}SND9-"
privateint currentPage; PLM _#+R>
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/** the begin index of the records by the current K}[>T(0E
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query */ L]a`"CH:a$
privateint beginIndex; TEUY3z[g
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/** The default constructor */ W;?(,xx
public Page(){ :5GZ \Z8F
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} ?_\$
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/** construct the page by everyPage D j\e@?Y
* @param everyPage DjMf,wX-{
* */ nZR!*$}A
public Page(int everyPage){ V+?]S
this.everyPage = everyPage; GC8}X;((Y
} y(
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/** The whole constructor */ 6VD1cb\lF
public Page(boolean hasPrePage, boolean hasNextPage, ryO$6L
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int everyPage, int totalPage, ~Lfcg*
int currentPage, int beginIndex){ !BU)K'mj
this.hasPrePage = hasPrePage; Do?P<x o
this.hasNextPage = hasNextPage; nW\(IkX\
this.everyPage = everyPage; ;%J5=f%z)
this.totalPage = totalPage; Y^$HrI(vq
this.currentPage = currentPage; <