Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 F4\:9ws
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 co\?SgE35
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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 O;VqrO
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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 3|$?T|#B
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分页支持类: ek)rsxf1A
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java代码: waC i9
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package com.javaeye.common.util; T+XcEI6w
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import java.util.List; wOL%otEf
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publicclass PaginationSupport { 1N _"Mm{
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publicfinalstaticint PAGESIZE = 30; 51s\)d%l
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privateint pageSize = PAGESIZE; ("A45\5
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privateList items; W9gQho%9b
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privateint totalCount; \Yp"D7:Qi
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privateint[] indexes = newint[0]; =:T"naY(
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privateint startIndex = 0; UV%o&tv|<
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public PaginationSupport(List items, int d<?Zaehe\
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totalCount){ c5f57Z
setPageSize(PAGESIZE); eiOAbO#U
setTotalCount(totalCount); im>/$!&OyI
setItems(items); unYPvrd
setStartIndex(0); ?>=vKU5
} \Q`#E'?
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public PaginationSupport(List items, int Mf"(P.GIS
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totalCount, int startIndex){ 8oHIXnK
setPageSize(PAGESIZE); %xx;C{g;a
setTotalCount(totalCount); S]ndnxy"b
setItems(items); VKXB)-'L
setStartIndex(startIndex); {>R933fap
} |<]wM(GxE
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public PaginationSupport(List items, int |Qpo[E}a
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totalCount, int pageSize, int startIndex){ y#ON=8l
setPageSize(pageSize); K/(Z\lL
setTotalCount(totalCount); 5*"WS $
setItems(items); UA0R)BH'
setStartIndex(startIndex); >Y3zO 2Cr
} ;%n(ARZ#
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publicList getItems(){ }q/[\3
return items; F
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} 2JHF*zvO-
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publicvoid setItems(List items){ FP6JfI8
this.items = items; =:RNpi,
} \Zk<|T61$
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publicint getPageSize(){ e+MsFXnB8
return pageSize; K!88 Nox(
} j;rxr1+w
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publicvoid setPageSize(int pageSize){ /3`fO^39Ta
this.pageSize = pageSize; zt
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} i;+<5_
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publicint getTotalCount(){ ~;uW)
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return totalCount; 7
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} 41XXL$
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publicvoid setTotalCount(int totalCount){ `MMZR=LA
if(totalCount > 0){ hcD.-(-;)
this.totalCount = totalCount; wMiRN2\^
int count = totalCount / #fe zUU
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pageSize; Z5>}
if(totalCount % pageSize > 0) LTio^uH
count++; m3b?f B
indexes = newint[count]; SL%
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for(int i = 0; i < count; i++){ Q"{Q]IT
indexes = pageSize * EG!):P
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} Hh;o<N>U
}else{ U[l{cRT
this.totalCount = 0; &
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} |Q~5TL>b
} WPNvZg9*c
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publicint[] getIndexes(){ kv/mqKVr
return indexes; X=b]Whuv
} <3aW3i/jTc
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publicvoid setIndexes(int[] indexes){
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this.indexes = indexes; 0f|nI8,z
} |-k~Fa
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publicint getStartIndex(){ J"RmV@|
return startIndex; E?P:!V=_
} ?f[U8S}
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publicvoid setStartIndex(int startIndex){ g JMv
if(totalCount <= 0) c1Ta!p{%
this.startIndex = 0; mq~L1<f
elseif(startIndex >= totalCount) oT27BK26?h
this.startIndex = indexes 8a4&}^|
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[indexes.length - 1]; at `\7YfQp
elseif(startIndex < 0) eMC0
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this.startIndex = 0; 4
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else{ VjVL/SO/
this.startIndex = indexes VWa;;?IK
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[startIndex / pageSize]; u0& dDZ
} +'!vm6
} pI|H9
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publicint getNextIndex(){ *6e 5T
int nextIndex = getStartIndex() + Xz, sL
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pageSize; K+_$
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if(nextIndex >= totalCount) |YAnd=$
return getStartIndex(); OjiQBsgnj
else 7o]p0iLej
return nextIndex; &<sN(;%0R
} aGz<Yip
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publicint getPreviousIndex(){ +wwK#ocw
int previousIndex = getStartIndex() - ES#K'Lf
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pageSize; 3%W
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if(previousIndex < 0) }~RH!Q1
return0; {s=$.Kg
else &v^LxLt+s
return previousIndex; EI29;
} z;_d?S<*m
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} ZdD]l*.\i
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抽象业务类 (Js'(tBhiU
java代码: hD>O LoO
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/** 2EOt.4cP
* Created on 2005-7-12 Z;_WU
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package com.javaeye.common.business; uL!{xuN
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import java.io.Serializable; G!54 e
import java.util.List; u=I>DEe@c
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import org.hibernate.Criteria; CW Y'q
import org.hibernate.HibernateException; mb*L'y2r
import org.hibernate.Session; Mp~E$f
import org.hibernate.criterion.DetachedCriteria; mB$r>G/'
import org.hibernate.criterion.Projections; t`DoTb4
import j0k"iv
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org.springframework.orm.hibernate3.HibernateCallback; %/H
import E#_TX3B
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org.springframework.orm.hibernate3.support.HibernateDaoS p3*}! ez4
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upport; cT8jG,+"}
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import com.javaeye.common.util.PaginationSupport; Z-b^{uP
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public abstract class AbstractManager extends @R?S-*o
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HibernateDaoSupport { VuFH
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privateboolean cacheQueries = false; @3{'!#/
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privateString queryCacheRegion; &|H?J,>
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publicvoid setCacheQueries(boolean Fy<dk}@
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cacheQueries){ pSASMc@
this.cacheQueries = cacheQueries; J(S.iTD
} 6d,jR[JP
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publicvoid setQueryCacheRegion(String B[Uvj~g
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queryCacheRegion){ 7[:9vY
this.queryCacheRegion = Jk|c!,!
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queryCacheRegion; ,~gY'Ql
} W=o90TwbN
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publicvoid save(finalObject entity){ ld4QhZia
getHibernateTemplate().save(entity); S[{#AX=0
} 29pIO]8;
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publicvoid persist(finalObject entity){ s6w</
getHibernateTemplate().save(entity); BM1uZJ0
} mKPyM<Q
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publicvoid update(finalObject entity){ :p(3Ap2TY
getHibernateTemplate().update(entity); '
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} ]6p?mBuQ
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publicvoid delete(finalObject entity){ %.BbPR 7?h
getHibernateTemplate().delete(entity); ?z171X0
} &n6mXFF#>P
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publicObject load(finalClass entity, ^~0\d;l_
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finalSerializable id){ )Rn}4)9!iT
return getHibernateTemplate().load $VhUZGuG>
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(entity, id); $[6:KV
} j>+x|!k
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publicObject get(finalClass entity, c</d1x T
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finalSerializable id){ @U_w:Q<9u
return getHibernateTemplate().get ~C{d2i
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(entity, id); <bWhTNOb
} v-3In\T=^
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publicList findAll(finalClass entity){ E#`=xg
return getHibernateTemplate().find("from bBc<yaN
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" + entity.getName()); cj`g)cX|
} ((\s4-
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publicList findByNamedQuery(finalString t(-noy)
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namedQuery){ ~&[Wqn@MZ
return getHibernateTemplate L@2T
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().findByNamedQuery(namedQuery); V{p*N*
} 'xm _oGWE
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publicList findByNamedQuery(finalString query, 57Q^"sl
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finalObject parameter){ y~w2^VN=
return getHibernateTemplate -tAdA2?G
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().findByNamedQuery(query, parameter); `9n%Dy<
} ;|6kFBGC"+
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publicList findByNamedQuery(finalString query, 6e3s
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finalObject[] parameters){ l)m\i_r:
return getHibernateTemplate Xp@8vu
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().findByNamedQuery(query, parameters); Kv^ez%I
} ~CgKU8
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publicList find(finalString query){ !'o5X]s
return getHibernateTemplate().find 55MrsiW
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(query); @d]I3?`
} 3o&PVU?Q
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publicList find(finalString query, finalObject aT1T.3 a
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parameter){ 2A7g}V
return getHibernateTemplate().find 2`hc0
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(query, parameter); wNMg Y
} c
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public PaginationSupport findPageByCriteria 4A6D>ChB'E
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(final DetachedCriteria detachedCriteria){ l!CWE
return findPageByCriteria 7?a@i;E<
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); F4'g}yOLd
} NfvvwG;M
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public PaginationSupport findPageByCriteria [lZo'o
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(final DetachedCriteria detachedCriteria, finalint k~f3~- "
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startIndex){ 2<HG=iSf
return findPageByCriteria fq(r,h=|
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(detachedCriteria, PaginationSupport.PAGESIZE, '{=dEEi
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startIndex); ~wG.'d]
} L".Qf|b*
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public PaginationSupport findPageByCriteria vJ5` :4n"
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(final DetachedCriteria detachedCriteria, finalint .2?txOKh
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pageSize, P'f0KZL;
finalint startIndex){ AZ'
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return(PaginationSupport) jO
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getHibernateTemplate().execute(new HibernateCallback(){ [P,YW|:n
publicObject doInHibernate k8fvg4
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(Session session)throws HibernateException { /3|uU
Criteria criteria = |O0=Q,<m
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detachedCriteria.getExecutableCriteria(session); _22;hnG<iy
int totalCount = #hL<9j
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((Integer) criteria.setProjection(Projections.rowCount DVCO(
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()).uniqueResult()).intValue(); Y4*ezt:;Q
criteria.setProjection v&g(6~b_>
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(null); =Gsn4>~%n
List items = Z}bUvr XP
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criteria.setFirstResult(startIndex).setMaxResults VYw
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(pageSize).list(); +$i-"^
PaginationSupport ps = -$Bom
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new PaginationSupport(items, totalCount, pageSize, v4]7"7GuW
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startIndex); zt/p'khP3
return ps; x17cMfCH%
} # Sfz^
}, true); $ijWwrh
} {XYv&K
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public List findAllByCriteria(final 9( ;lcOz
Id8^6FLw
DetachedCriteria detachedCriteria){ 4-^LC<}k
return(List) getHibernateTemplate sW%U3,j
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().execute(new HibernateCallback(){ 51.! S
publicObject doInHibernate W]|;ZzZ=m
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(Session session)throws HibernateException { $LUNA.
Criteria criteria = zjd]65P
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detachedCriteria.getExecutableCriteria(session); #BK\cIr
return criteria.list(); 9k.LV/Y
} G
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}, true); ]X4
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} $^R[t;
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public int getCountByCriteria(final 2%g)0[1
= !D<1<
DetachedCriteria detachedCriteria){ >O[# 661
Integer count = (Integer) cWIX!tc8
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getHibernateTemplate().execute(new HibernateCallback(){ T1m097
publicObject doInHibernate N>;"r]Rl"
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(Session session)throws HibernateException { )_!t9gn*wr
Criteria criteria = * bmdY=#7
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detachedCriteria.getExecutableCriteria(session); jM1|+o*Wr
return Mj5=t:MI
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criteria.setProjection(Projections.rowCount *g&[?y`UC
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()).uniqueResult(); ,c_[`q\
} NwM =
}, true); u#XNl":x
return count.intValue(); c>d+q9M
} reLYtv
} /Kb7#uq
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用户在web层构造查询条件detachedCriteria,和可选的 3EB8ls2
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 esmQ\QQ^1
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PaginationSupport的实例ps。 %*]3j^b Q+
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ps.getItems()得到已分页好的结果集 lY!`<