Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 :P/0 "
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ]tsp}M@
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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 qGkD] L
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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 !kQJ6U
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分页支持类: /RBIZ_
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java代码: L (@".{T
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package com.javaeye.common.util; \R|qXB $
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import java.util.List; =IEei{
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publicclass PaginationSupport { Aa!#=V1d
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publicfinalstaticint PAGESIZE = 30; e13' dCG
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privateint pageSize = PAGESIZE; j`l'Mg
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privateList items; #-7m@EU;O
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privateint totalCount; YF$nL(
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privateint[] indexes = newint[0]; EHH+)mlo
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privateint startIndex = 0; 8dlhL8#
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public PaginationSupport(List items, int *T-v^ndJh
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totalCount){ Lt2<3DB
setPageSize(PAGESIZE); M d.^r5r
setTotalCount(totalCount); 8c<OX!
setItems(items); I#U)
setStartIndex(0); kn= fW1
} %ou@Y`
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public PaginationSupport(List items, int H]PEE!C;xC
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totalCount, int startIndex){ 2|JtRE+
setPageSize(PAGESIZE); [?S-on.
setTotalCount(totalCount); h:Hpz
setItems(items); 5NN`tv
setStartIndex(startIndex); {O5(O oDa
} ij&T\):d
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public PaginationSupport(List items, int #sb@)Q
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totalCount, int pageSize, int startIndex){ 5uO.@0
setPageSize(pageSize); fa2hQJ02
setTotalCount(totalCount); _\u?]YTv
setItems(items); 0/fA>%&
setStartIndex(startIndex); ;3
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publicList getItems(){ `c'R42SA
return items; ;, ^AR{+x
} -jcgxQH53
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publicvoid setItems(List items){ *4O9W8Qz
this.items = items; UY/qI%#L#,
}
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publicint getPageSize(){ w~Jy,[@n
return pageSize; ?xYoCn}Z
} "q3W&@
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publicvoid setPageSize(int pageSize){ MBO>.M$B
this.pageSize = pageSize; b&I{?'"% 8
} #KwK``XC4
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publicint getTotalCount(){ pXl*`[0X#
return totalCount; }=
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} ' qN"!\
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publicvoid setTotalCount(int totalCount){ \) vI-
if(totalCount > 0){ U{Moyj
this.totalCount = totalCount; lJdwbuB6
int count = totalCount / 6
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pageSize; DW0UcLO
if(totalCount % pageSize > 0) );1UbqVPD
count++;
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indexes = newint[count]; eWU@@$9
for(int i = 0; i < count; i++){ ER)to<k
indexes = pageSize * S%2q X"8
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} cB|Rj}40v
}else{ ILMXWw
this.totalCount = 0; < SvjvV
} OQ*rxLcA
} ]n^TN
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publicint[] getIndexes(){ v)-:0f
return indexes; =SpD6
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} ;}QM#5Xdt
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publicvoid setIndexes(int[] indexes){ \Zmn!Gg
this.indexes = indexes; J6J|&Z~UT,
} ~#nbD-*#
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publicint getStartIndex(){ $p~X"f?0
return startIndex; |!\5nix3A>
} I'a&n}jx
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publicvoid setStartIndex(int startIndex){ khS >
if(totalCount <= 0) #S*cFnd
this.startIndex = 0; HG:9yP<,o
elseif(startIndex >= totalCount)
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this.startIndex = indexes Lk:Sju
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[indexes.length - 1]; 4j VFzO%.
elseif(startIndex < 0) {[$JiljD
this.startIndex = 0; >gGdzL
else{ <OA[u-ph%S
this.startIndex = indexes >do3*koA
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[startIndex / pageSize]; 3,$G?auW
} Hsvu&>[`S
} ;1Zz-@
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publicint getNextIndex(){ fd /?x^Z
int nextIndex = getStartIndex() + x9B5@2J1
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pageSize; f<}>*xH/k
if(nextIndex >= totalCount) 3 V{&o,6
return getStartIndex(); ^7$V>|
else SRBQ"X[M2
return nextIndex; PAHkF&
} <Q|(dFr`v
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publicint getPreviousIndex(){ ~
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int previousIndex = getStartIndex() - aK4ZH}XHE"
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pageSize; t)h{ w"v
if(previousIndex < 0) `(6g87h
return0; |*[#Iii'
else y`Km96Ui
return previousIndex; DP<[Uz&
} "+GKU)
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} D8,V'n>L
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抽象业务类 (HD=m,}
java代码: .Bb86Y=3
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/** #V:28[
* Created on 2005-7-12 ji:E
*/ mw,\try
package com.javaeye.common.business; @/yJTMcf
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import java.io.Serializable; |E=8
import java.util.List; i!k5P".o^
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import org.hibernate.Criteria; +kN/-UsB
import org.hibernate.HibernateException; G"&yE.E5
import org.hibernate.Session; ?!d\c(5Gt
import org.hibernate.criterion.DetachedCriteria; ~D$?.,=l
import org.hibernate.criterion.Projections; Vv J]*D+e
import ;\[el<Y)s
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org.springframework.orm.hibernate3.HibernateCallback; }W)c-91
import nm.~~h+8M
{ :m%n-
org.springframework.orm.hibernate3.support.HibernateDaoS 3$Y(swc
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upport; VM [U&g<8n
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import com.javaeye.common.util.PaginationSupport; tbr1mw'G
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public abstract class AbstractManager extends
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HibernateDaoSupport { ds9L4zfO
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privateboolean cacheQueries = false; (g>>
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privateString queryCacheRegion; H*M )<"X
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publicvoid setCacheQueries(boolean RV2s@<0p
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cacheQueries){ G6?+Qzr
this.cacheQueries = cacheQueries; ^Cm9[1p
} xct{Tv[FO
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publicvoid setQueryCacheRegion(String 1aQR9zg%
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queryCacheRegion){ Cb5Rr+K=
this.queryCacheRegion = wx,yx3c (
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queryCacheRegion; |_7AN!7j
} nn0`A3
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publicvoid save(finalObject entity){ O
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getHibernateTemplate().save(entity); E>}(r%B
} q4~w
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publicvoid persist(finalObject entity){ I!L`W
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getHibernateTemplate().save(entity); S3G9/
} c9 c_7g'q-
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publicvoid update(finalObject entity){ \:To>A32
getHibernateTemplate().update(entity); %}nNwuJ
} #Oeb3U
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publicvoid delete(finalObject entity){ !FqJP
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getHibernateTemplate().delete(entity); Nzo;j0 [
} ~T{^7"q\
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publicObject load(finalClass entity, {7%W/C#A
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finalSerializable id){ J ^y1=PM
return getHibernateTemplate().load l.
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(entity, id); ;_HG
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} 1TagQ
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publicObject get(finalClass entity, cQ?eL,z
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finalSerializable id){ #%;QcDXRe
return getHibernateTemplate().get Cm~Pn"K_]
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(entity, id); -/y]'_a
} e#+u8 LrN
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publicList findAll(finalClass entity){ $y0[AB|V
return getHibernateTemplate().find("from _XO3ml\x@
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" + entity.getName()); t+,'
} lhx"<kR4
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publicList findByNamedQuery(finalString 6 cF~8
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namedQuery){ \I@hDMqv
return getHibernateTemplate \-]zXKl2k
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().findByNamedQuery(namedQuery); 1[;
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} Cggu#//Z}Q
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publicList findByNamedQuery(finalString query, n0ZrgTVJ
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finalObject parameter){ P?#I9y7iP
return getHibernateTemplate EO_:C9=d{
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().findByNamedQuery(query, parameter); )g()b"Z
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} kE8\\}B7
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publicList findByNamedQuery(finalString query, rT&rv^>f
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finalObject[] parameters){ ;*H@E(g
return getHibernateTemplate /S9(rI<'
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().findByNamedQuery(query, parameters);
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} tFi'RRZ
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publicList find(finalString query){ i40'U?eG~6
return getHibernateTemplate().find 1?oX"
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(query); 8JFns-5
} NrVE[Z#
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publicList find(finalString query, finalObject Q[wTV3d
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parameter){ 'o!{YLJ fM
return getHibernateTemplate().find !:GlxmtoW?
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(query, parameter); ^%qe&Pe2
} |h7 d#V>
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public PaginationSupport findPageByCriteria R [[
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(final DetachedCriteria detachedCriteria){ _, ki/7{
return findPageByCriteria '&;s32']}
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); pef)c,U$
} F%]ZyO9
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public PaginationSupport findPageByCriteria )Z=S'm
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(final DetachedCriteria detachedCriteria, finalint UA8*8%v
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startIndex){ DD?zbN0X
return findPageByCriteria \se
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(detachedCriteria, PaginationSupport.PAGESIZE, 4pJ #fkc^
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startIndex); '|7'dlW
} j1141md5
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public PaginationSupport findPageByCriteria ;k=&ZV
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(final DetachedCriteria detachedCriteria, finalint l(<=JUO;
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pageSize, ( Ev=kO
finalint startIndex){ LK}*k/eG
return(PaginationSupport) TSEv^u)3
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getHibernateTemplate().execute(new HibernateCallback(){ hRFm]q
publicObject doInHibernate #1z/rUh`Cr
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(Session session)throws HibernateException { ea3f`z
Criteria criteria = Ds<~JfVl
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detachedCriteria.getExecutableCriteria(session); ^D5+S`V
int totalCount = QUO'{;,
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((Integer) criteria.setProjection(Projections.rowCount O,[9E
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()).uniqueResult()).intValue(); _wp_y-"
criteria.setProjection wV\.NQtS
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(null); |\<L7|hb9
List items = B~h3naSe
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criteria.setFirstResult(startIndex).setMaxResults q\n,/#'i~
RA$%3L[A!
(pageSize).list(); Tv6HPD$[
PaginationSupport ps = nXT/zfS
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new PaginationSupport(items, totalCount, pageSize, VxAG=E
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startIndex); yBl9 a-2A
return ps; ;@FCaj&
} ;W?mQUo:P8
}, true); 7SJbrOL4Q-
} P\ia ?9
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public List findAllByCriteria(final QX+Xi<YE-
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DetachedCriteria detachedCriteria){ ufn%sA
return(List) getHibernateTemplate Eyq4w
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().execute(new HibernateCallback(){ Gq]/6igzX
publicObject doInHibernate MS`XhFPS.
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(Session session)throws HibernateException { PS3jCT
Criteria criteria = 3jx /1VV
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detachedCriteria.getExecutableCriteria(session); q|sT4}
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return criteria.list(); ]NyN@9u@(
} -)Hc^'.
}, true); k![oJ.vHD
} *|as-!${k
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public int getCountByCriteria(final vcC"
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DetachedCriteria detachedCriteria){ tTbfyI
Integer count = (Integer) g=$nNQ
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getHibernateTemplate().execute(new HibernateCallback(){ [0!*<%BgK'
publicObject doInHibernate ;]l`Q,*OXb
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(Session session)throws HibernateException { CT/>x3o
Criteria criteria = ~t<uX "K
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detachedCriteria.getExecutableCriteria(session); QIfP%,LT
return x^Zm:Jrw~
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criteria.setProjection(Projections.rowCount a1shP};pK
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()).uniqueResult(); v0( _4U]/
} QJSi|&Rx&?
}, true); 40O@a:q*
return count.intValue(); \A6}=
} kZ= 2#.
} VAp 1{
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用户在web层构造查询条件detachedCriteria,和可选的 ';m;K
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 [OS&eK 8
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PaginationSupport的实例ps。 |d,bo/:
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ps.getItems()得到已分页好的结果集 ,hZ?]P&
ps.getIndexes()得到分页索引的数组 NZ?dJ"eq7
ps.getTotalCount()得到总结果数 -"I9`
ps.getStartIndex()当前分页索引 $wbIe"|
ps.getNextIndex()下一页索引 R[rOzoNp0
ps.getPreviousIndex()上一页索引 _YN
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 cYBjsN(!A|
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 `~\8fN
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一下代码重构了。 cC]]H&'Hg+
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我把原本我的做法也提供出来供大家讨论吧: t>x!CNb'C
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首先,为了实现分页查询,我封装了一个Page类: +11 oVW
java代码: 1tTY)Evf
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/*Created on 2005-4-14*/ c:+UC
package org.flyware.util.page; VV sE]7P ]
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/** nU 0##
* @author Joa 'v=BAY=Ef
* fAfB.|cd
*/ 5kA D vi.
publicclass Page { a54S,}|
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/** imply if the page has previous page */ K92M9=>
privateboolean hasPrePage; eR/X9<
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/** imply if the page has next page */ t~.^92]s|
privateboolean hasNextPage; %NfH`%`
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/** the number of every page */ B9,
privateint everyPage; wUfPnAD.'
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/** the total page number */ :9(w~bB9$
privateint totalPage; EW3--33s
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/** the number of current page */ 6zi
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privateint currentPage; =vDpm,
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/** the begin index of the records by the current ,u!_mV
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query */ E.-2 /'i
privateint beginIndex; %o`Cp64`Q
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/** The default constructor */ ha9 dz
public Page(){ =/4}!B/
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} A2Iqn5
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/** construct the page by everyPage U.<a d
* @param everyPage #vViEBVeN
* */ %WYveY
public Page(int everyPage){ .
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this.everyPage = everyPage; %;J$ h^
} 'lgS)m
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/** The whole constructor */ /)rv Ndn
public Page(boolean hasPrePage, boolean hasNextPage, $]?M[sL\N7
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int everyPage, int totalPage, 'o7V6KG
int currentPage, int beginIndex){ Xj:\B] v]
this.hasPrePage = hasPrePage; Ev48|X6
this.hasNextPage = hasNextPage; 1W9uWkk_d
this.everyPage = everyPage; |voZ0U
this.totalPage = totalPage; nrM-\'
this.currentPage = currentPage; gpCWXz')i
this.beginIndex = beginIndex; 3v)``
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} c{jTCkzq
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/** &*~_ "WyU
* @return :r&4/sN}<
* Returns the beginIndex. )=0@4
*/ )xTu|V
publicint getBeginIndex(){
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return beginIndex; `<%
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} F_V/&OV
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/** ~sCdvBA
* @param beginIndex 6{ pg^K
* The beginIndex to set. al4X}
*/ Vj[,o
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publicvoid setBeginIndex(int beginIndex){ j 2e|
this.beginIndex = beginIndex; hP
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} "}<baz
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/** @%6"xnb`
* @return r<"k
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* Returns the currentPage. @$?*UI6y
*/ \Pd>$Q
publicint getCurrentPage(){ CW~c<,"
return currentPage; zBqNE`
} RP6hw|
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/** =%+xNOdN7?
* @param currentPage "T6s;'k
* The currentPage to set. tSaD=# v
*/ 6H|&HV(!R
publicvoid setCurrentPage(int currentPage){ {JW_ZJx
this.currentPage = currentPage; w#;y
} ,L8(Vo`-
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/** 7:OF>**
* @return `W4Is~VVv
* Returns the everyPage. f7 zGz
*/ 0JLQ.%_
publicint getEveryPage(){ >):>Pz%U
return everyPage; |TuFx=~5v
} *GM.2``e
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/** x c$jG?83#
* @param everyPage S!7|vb*ko
* The everyPage to set. f`p"uLNo<
*/ AJt4I
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publicvoid setEveryPage(int everyPage){ v?S3G-r
this.everyPage = everyPage; 'k9 1;T[
} i7xBi:Si
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/** {OW.^UIq^
* @return 2Xp?O+b#"O
* Returns the hasNextPage. w'P!<JaZ
*/ fMRMQR=6B
publicboolean getHasNextPage(){ ,a}
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return hasNextPage; O@,9a~Ghd
} Q E*`#r#e
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/** x5W.
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* @param hasNextPage 7.C~ OrGR
* The hasNextPage to set. =7<g;u
*/ Z`kI6
publicvoid setHasNextPage(boolean hasNextPage){ v,,Dz8!Ty
this.hasNextPage = hasNextPage; + Scw;gO
} xtRHb''FX
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/** psE&Rx3)
* @return *W=R:Bl!
* Returns the hasPrePage. 0o-KjX?kP
*/ mdukl!_x
publicboolean getHasPrePage(){ ;bes#|^F
return hasPrePage; 0]`%iG|
} %PxJnMb?
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/** +(J{~A~
* @param hasPrePage F<A[S"
* The hasPrePage to set. TTzvH;S
*/ 63y&M