Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 _aq3G9C_
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 {R]4N]l>
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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 H$WuT;cTE
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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 ]0g<][m
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分页支持类: =p:D_b
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java代码: #~ UG9@a
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package com.javaeye.common.util; G^5}T>TV
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import java.util.List; BY72 fy#e
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publicclass PaginationSupport { !bS:!Il9=
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publicfinalstaticint PAGESIZE = 30; ~8RN
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privateint pageSize = PAGESIZE;
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privateList items; [@_}BZk
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privateint totalCount; ;)~loa1\
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privateint[] indexes = newint[0]; gVl%:Ra%
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privateint startIndex = 0; Jah~h44&
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public PaginationSupport(List items, int aB+Ux<
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totalCount){ },ef(
setPageSize(PAGESIZE); D~G24k6b3
setTotalCount(totalCount); ?,O{,2}
setItems(items); D*I%=);B_
setStartIndex(0); 6m|j "m
} Ft#d&
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public PaginationSupport(List items, int hj4Kv
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totalCount, int startIndex){ |#Z:v1]"
setPageSize(PAGESIZE); '/J}T -,Z
setTotalCount(totalCount); M9[Fx=
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setItems(items); |ffM6W1:
setStartIndex(startIndex); -tlRe12
} D}r,t_]Eb
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public PaginationSupport(List items, int 2r^|
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totalCount, int pageSize, int startIndex){ ]2+7?QL,
setPageSize(pageSize); |Qo;=~7
setTotalCount(totalCount); ^Bf@ I
setItems(items); VZ5EV'D8!
setStartIndex(startIndex); j
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} m$Lq#R={Z
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publicList getItems(){ _ko16wfg
return items; +'Ec)7m
} }E+#*R3auB
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publicvoid setItems(List items){ G>qzAgA
this.items = items; GNlP]9wX
} w(zlHj
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publicint getPageSize(){ }Zu>?U
return pageSize; xv4_q-r[
}
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publicvoid setPageSize(int pageSize){ _=Ed>2M)no
this.pageSize = pageSize; NjIe2)}'
} 8%nb1CA
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publicint getTotalCount(){ k4FxdX
return totalCount; o}C| N)'
} N{U``LV
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publicvoid setTotalCount(int totalCount){ e
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if(totalCount > 0){ \BOZhXfl'
this.totalCount = totalCount; '8R5?9"
int count = totalCount / wuSp+?{5k
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pageSize; Av:5v3%
if(totalCount % pageSize > 0) {{7%z4l
count++; %]S~PKx
indexes = newint[count]; NHG+l)y:
for(int i = 0; i < count; i++){ 0wU8PZ Nj
indexes = pageSize * ^R',P(@oL
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} ;3wj(o0
}else{ ?kEcYD
this.totalCount = 0; P~$FgAV
} E$"( :%'v
} ">PpC]Y1
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publicint[] getIndexes(){ m`l3@Z
return indexes; ]@)T]
} /*\pm!]._^
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publicvoid setIndexes(int[] indexes){ @|! 9~F
this.indexes = indexes; \' (_r
} HQlhT
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publicint getStartIndex(){ s\A"B#9r
return startIndex; [zmx
} gU1E6V-Jm
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publicvoid setStartIndex(int startIndex){ 4X,fb`
if(totalCount <= 0) q y"VrR
this.startIndex = 0; ~RGZY/4
elseif(startIndex >= totalCount) fZ!fwg$
this.startIndex = indexes PI@/jh
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[indexes.length - 1]; +NL^/y<;
elseif(startIndex < 0) <8Y;9N|94!
this.startIndex = 0; oo sbf#V
else{ o;bK 7D
this.startIndex = indexes IH|PdVNtg
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[startIndex / pageSize]; %%J)@k^vH
} $OOZ-+8
} J!r,ktO^U?
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publicint getNextIndex(){ 0IU>KGJ-0s
int nextIndex = getStartIndex() + b=[gK|fu
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pageSize; >'IFr9&3
if(nextIndex >= totalCount) @pq#?
return getStartIndex(); h!# (. P
else <WXO].^
return nextIndex; Q|40
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} sjh>i>t
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publicint getPreviousIndex(){ ;M,u,KH)/
int previousIndex = getStartIndex() - h%'4V<V
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pageSize; I,4t;4;Zk
if(previousIndex < 0) s|iph~W!L
return0; A)9[.fhx
else R?aE:\A
return previousIndex; 4dy2m!
} xs<~[l
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} HSq.0vYl6
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抽象业务类 a*4"j2j v
java代码: u`E24~
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/** P'o:Vhm_H
* Created on 2005-7-12 X4<!E#
*/ J?/.|Y]e
package com.javaeye.common.business; _4E .
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import java.io.Serializable; )9_jr(s
import java.util.List; F\m
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import org.hibernate.Criteria; +R7";.
import org.hibernate.HibernateException; -w41Bvz0
import org.hibernate.Session; T';<;6J**
import org.hibernate.criterion.DetachedCriteria; ucm3'j
import org.hibernate.criterion.Projections; ] iKFEd
import gI^);JrTE
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org.springframework.orm.hibernate3.HibernateCallback; k;V4%O
import 7 mulNq
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org.springframework.orm.hibernate3.support.HibernateDaoS z1\G,mJK
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upport; wv,,#P
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import com.javaeye.common.util.PaginationSupport; JL~QE-pvD
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public abstract class AbstractManager extends \jn[kQ+pJ
DbSl}N ;
HibernateDaoSupport { \Cx)
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privateboolean cacheQueries = false;
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privateString queryCacheRegion; E-,74B&H
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publicvoid setCacheQueries(boolean m:TS
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cacheQueries){ 9H*$3
this.cacheQueries = cacheQueries; %hU8ycI*h
} 8F0+\40
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publicvoid setQueryCacheRegion(String jIMaPT
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queryCacheRegion){ GY4:9Lub7
this.queryCacheRegion = EWN$ILdD
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queryCacheRegion; 9bjjo;A
} IS7g{:}=p
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publicvoid save(finalObject entity){ / /qTMxn
getHibernateTemplate().save(entity); 7\^b+*
} %"
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publicvoid persist(finalObject entity){ wP1dPl_j:0
getHibernateTemplate().save(entity); 7dX1.}M<(
} !-r@_tn|
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publicvoid update(finalObject entity){ cWgiFv
getHibernateTemplate().update(entity); ) 0$7{3
} ]M{SM`Ya
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publicvoid delete(finalObject entity){ _6qf>=qQ`"
getHibernateTemplate().delete(entity); 3P/T`)V
} tjOfekU
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publicObject load(finalClass entity, qsFA~{o.
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finalSerializable id){ r0QjCFSF=
return getHibernateTemplate().load ]*}*zXN/E
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(entity, id); !`,6E`Y#
} c@
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publicObject get(finalClass entity, O<f_-n@G|
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finalSerializable id){ ix^:qw;
return getHibernateTemplate().get yqlkf$?
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(entity, id); P%pB]d.qpi
} gU>Y
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publicList findAll(finalClass entity){ ekI1j%fO
return getHibernateTemplate().find("from x:;8U i"&B
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" + entity.getName()); S~YrXQ{_>-
} nP'ab_>b
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publicList findByNamedQuery(finalString `;*=2M<c
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namedQuery){ ]9zc[_
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return getHibernateTemplate a>sUq["
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().findByNamedQuery(namedQuery); I=f1kr
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} 4OCz:t
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publicList findByNamedQuery(finalString query, RZ|s[bU
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finalObject parameter){ z2!NBOv
return getHibernateTemplate VbBZ\`b
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().findByNamedQuery(query, parameter); 3z&,>CEX
} nImRU.;P
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publicList findByNamedQuery(finalString query, o [ar.+[
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finalObject[] parameters){ :+]6SC0ql
return getHibernateTemplate PhKJ#DRbr
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().findByNamedQuery(query, parameters); %~Nf,
} `{F8#
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publicList find(finalString query){ ^fnRzX
return getHibernateTemplate().find n{Jvx>);
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(query); ,X$S4>
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publicList find(finalString query, finalObject
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parameter){ DKIDLf
return getHibernateTemplate().find +tfmBZl^
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(query, parameter); $C#~c1w
} ^_5$+
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public PaginationSupport findPageByCriteria J>hl&J
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(final DetachedCriteria detachedCriteria){ sS5#Q
return findPageByCriteria + 6r@HK`,t
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); XFK$p^qu
} tm+}@CM^.
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public PaginationSupport findPageByCriteria %l:%c
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(final DetachedCriteria detachedCriteria, finalint JEJ]'3
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startIndex){ j?w7X?1(
return findPageByCriteria D
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(detachedCriteria, PaginationSupport.PAGESIZE, q;kMeE*
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startIndex); *WMcE$w/D
} >)#*}JI
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public PaginationSupport findPageByCriteria T'Jw\u>"R
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(final DetachedCriteria detachedCriteria, finalint V7rcnk#
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pageSize, puXJ:yo(
finalint startIndex){ y"@~5e477$
return(PaginationSupport) I|WBT
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getHibernateTemplate().execute(new HibernateCallback(){
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publicObject doInHibernate )-
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(Session session)throws HibernateException { 5^*
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Criteria criteria = X/gh>MJJ<
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detachedCriteria.getExecutableCriteria(session); p' /$)klt
int totalCount = >2VB.f
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((Integer) criteria.setProjection(Projections.rowCount }s{zy:1O
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()).uniqueResult()).intValue(); z)|56
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criteria.setProjection r T*:1
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(null); DeXnE$XH
List items = ? `FI!3j
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criteria.setFirstResult(startIndex).setMaxResults d54>nycU~N
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(pageSize).list(); I[[rVts
PaginationSupport ps = GueqpEd2
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new PaginationSupport(items, totalCount, pageSize, IK%j+UB
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startIndex); .4KXe"~E
return ps; ~=0zZTG
} 4|++0=#D$
}, true); /5yWvra
} N{Is2Ia
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public List findAllByCriteria(final .4-;
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DetachedCriteria detachedCriteria){ +8BH%f}X
return(List) getHibernateTemplate Z#4? /'
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().execute(new HibernateCallback(){ vaK$j!%FE
publicObject doInHibernate
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(Session session)throws HibernateException { 25YJH1x
Criteria criteria = vV=$N"bT~
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detachedCriteria.getExecutableCriteria(session); 7Bmt^J5i&t
return criteria.list(); eU{=x$o6S
} MWhFNfS8=
}, true); IL>Gi`Y&
} F*I{?NRN1
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public int getCountByCriteria(final 26\1tOj Np
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DetachedCriteria detachedCriteria){ VK?,8Y
Integer count = (Integer) Uyi_B.:`
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getHibernateTemplate().execute(new HibernateCallback(){ !T
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publicObject doInHibernate :5CwRg
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(Session session)throws HibernateException { Gm>8=
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Criteria criteria = Bxm^Arc>
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detachedCriteria.getExecutableCriteria(session); 40q8,M
return U 2\{(y
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criteria.setProjection(Projections.rowCount ;o8cfD .z
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()).uniqueResult(); zo]7#
} ADHe![6q
}, true); {}lw%d?A
return count.intValue(); YTYYb#"Q
} "=/XIM.
} '-ACNgNn
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用户在web层构造查询条件detachedCriteria,和可选的 Txw,B2e)>
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 GbNVcP.ocP
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PaginationSupport的实例ps。 [0IeEjL
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ps.getItems()得到已分页好的结果集 Em
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ps.getIndexes()得到分页索引的数组 'VF9j\a
ps.getTotalCount()得到总结果数 \8F$85g
ps.getStartIndex()当前分页索引 _G'.VSGH
ps.getNextIndex()下一页索引 gk]r:p<