Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 +mn,F};
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 x^y'P<ypw
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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 -4
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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 PK `D8)=u
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。
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分页支持类: 8|\8O@
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java代码: |>dI/_'
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package com.javaeye.common.util; m)'=G%y
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import java.util.List; wY[+ZT
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publicclass PaginationSupport { OG>}M$Ora
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publicfinalstaticint PAGESIZE = 30; toBHkiuD
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privateint pageSize = PAGESIZE; 8ap%?
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privateList items; v@
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privateint totalCount; VgZsB$Ori
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privateint[] indexes = newint[0]; H _zo1AW
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privateint startIndex = 0; ]1#e#M]#
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public PaginationSupport(List items, int Ju1D
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totalCount){ Ng~FEl
setPageSize(PAGESIZE); H[U!%Z
setTotalCount(totalCount); 3 cK I
setItems(items); 0tT(W^ho g
setStartIndex(0); :&V h?
} Dv5D~on{
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public PaginationSupport(List items, int e#$]Y?,
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totalCount, int startIndex){ #Y
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setPageSize(PAGESIZE); S.-TOE
setTotalCount(totalCount); $QLcH;+7t
setItems(items); !
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setStartIndex(startIndex); kuszb~`zPY
} }HFN3cq;C
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public PaginationSupport(List items, int *zbNd:i9
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totalCount, int pageSize, int startIndex){ 5K>3My#
setPageSize(pageSize); ~j}cyHg
setTotalCount(totalCount); dMv=gdY
setItems(items); nrub*BuA
setStartIndex(startIndex); 4;yKOQD|
} JfLqtXF[&"
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publicList getItems(){ R{<kW9!
return items; Q ayPo]O
} jaII r06
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publicvoid setItems(List items){ 'vbsv T
this.items = items; n|9-KTe7|*
} :LF?
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publicint getPageSize(){ 0zmE>/O+
return pageSize; Z>:NPZODf
} .WA-&b_
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publicvoid setPageSize(int pageSize){ 5Ha9lM2gh
this.pageSize = pageSize; 5q3JI
} i&bA2p3+d
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publicint getTotalCount(){ *\+\5pu0
return totalCount; PUp6Q;AdQ
} CkOz
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publicvoid setTotalCount(int totalCount){ riY~%9iV'
if(totalCount > 0){ zy/@
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this.totalCount = totalCount; a*lh)l<KV
int count = totalCount / +Vb.lH[av
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pageSize; Rr&h!YMb
if(totalCount % pageSize > 0) }~e8e
count++; 2=,lcWr
indexes = newint[count]; 5Dm.K?l;
for(int i = 0; i < count; i++){ } gyj0
indexes = pageSize * z+0I#kM"1
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} nLbFg0?+t
}else{ %(3|R@G.
this.totalCount = 0; DE}K~}sbd
} nv*FT
} 5sj4;w[
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publicint[] getIndexes(){ kbX8$xTM
return indexes; 4Tb
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} HSjlD{R
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publicvoid setIndexes(int[] indexes){ V,lOt4b
this.indexes = indexes; Q{s H3Y#l
} #xsE3Wj-X
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publicint getStartIndex(){ MU@UfB|;u
return startIndex; 44ek
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} W9 GxXPA
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publicvoid setStartIndex(int startIndex){ >?2M
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if(totalCount <= 0) H%qsjB^
this.startIndex = 0; JFcLv=U
elseif(startIndex >= totalCount) >*~L28Fyn
this.startIndex = indexes :3v}kLO7|
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[indexes.length - 1]; 6a(yp3
elseif(startIndex < 0) DU0zez I9
this.startIndex = 0; M'?,] an
else{ ZQ4p(6a
this.startIndex = indexes ! E<[JM
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[startIndex / pageSize]; EU2$f
} D=q:*x
} *v;2PP[^
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publicint getNextIndex(){ $O&b``
int nextIndex = getStartIndex() + 9&-dTayIz
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pageSize; cvn@/qBq*t
if(nextIndex >= totalCount) "%`1]Fr
return getStartIndex(); dU&a{$ku[
else <Th6r.#?
return nextIndex; yZ0-wI
} I&D5;8
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publicint getPreviousIndex(){ |^&b8
int previousIndex = getStartIndex() - ePOG}k($/%
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pageSize; C)[,4wt,
if(previousIndex < 0) xgwY@'GN
return0; b1(T4w6
else >!eAM )
return previousIndex; ,`'Qi%O
} Fco`^kql.D
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} %0S3V[4I
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抽象业务类 8zZvht*
java代码: 3@etRd;]Kr
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/** ]~Rho_mq#
* Created on 2005-7-12 H*d9l2,KZS
*/ ]AINKUI0
package com.javaeye.common.business; O*hDbM2QQw
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import java.io.Serializable; -$pzl,^ h
import java.util.List; j@n)kPo,1
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import org.hibernate.Criteria; Z+*9#!?J
import org.hibernate.HibernateException; 9g9HlB&Ze
import org.hibernate.Session; >~''&vdsk\
import org.hibernate.criterion.DetachedCriteria; z6KCv(zvB
import org.hibernate.criterion.Projections; ]0Y4U7W
import ,82S=N5V!
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org.springframework.orm.hibernate3.HibernateCallback; Y>dF5&(kb
import /K+r?
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org.springframework.orm.hibernate3.support.HibernateDaoS 3atBX5
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upport; Tr_w]'
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import com.javaeye.common.util.PaginationSupport; R[zpD%CI
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public abstract class AbstractManager extends ]&o$b ]
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HibernateDaoSupport { h0(BO*cy
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privateboolean cacheQueries = false; 4V{:uuI;f
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privateString queryCacheRegion; w;%.2VJ
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publicvoid setCacheQueries(boolean ;@mS^ik")$
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cacheQueries){ 8EZ$g<}
this.cacheQueries = cacheQueries;
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} Xe3U`P7(
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publicvoid setQueryCacheRegion(String G~F b
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queryCacheRegion){ .eS<Dbku<
this.queryCacheRegion = ST|x23|O]
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queryCacheRegion; piJu+tUy
} ~Q Oe##
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publicvoid save(finalObject entity){ @D]5c ivm_
getHibernateTemplate().save(entity); C/q'=:H;
} 1XrO~W\=
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publicvoid persist(finalObject entity){ kDEXN
getHibernateTemplate().save(entity); x,'(5*
} &u]8IEv}u
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publicvoid update(finalObject entity){ Ab~3{Q]#
getHibernateTemplate().update(entity); Z&G+bdA>,
} _mj,u64
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publicvoid delete(finalObject entity){ c/:b.>W
getHibernateTemplate().delete(entity); ~Zun&b)S
} R8Wr^s>'
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publicObject load(finalClass entity, /,BD#|
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finalSerializable id){ e|g5=2(Pr&
return getHibernateTemplate().load IDad9 Bx
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(entity, id); fJ=0HNmX
} sSr&:BOsi
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publicObject get(finalClass entity, Z|&MKG24
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finalSerializable id){ kYM~d07 V
return getHibernateTemplate().get |O{m2Fi
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(entity, id); im${3 >26
}
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publicList findAll(finalClass entity){ '@a}H9>}
return getHibernateTemplate().find("from aEBu *`-j
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" + entity.getName()); To\QjP-
} FXpJqlhNv
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publicList findByNamedQuery(finalString Ozw.siD
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namedQuery){ <!&[4-;fU
return getHibernateTemplate HNb/-e ,"
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().findByNamedQuery(namedQuery); ^8]NxV@l
} )~&CvJ
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publicList findByNamedQuery(finalString query, n|6Ic,:[
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finalObject parameter){ S:u:z=:r
return getHibernateTemplate _Ym]Mj' ln
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().findByNamedQuery(query, parameter); bpOYHc6,*`
} 'g">LQ~a+
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publicList findByNamedQuery(finalString query, e-~N"
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finalObject[] parameters){ Mhm@R@
return getHibernateTemplate w{{gu1#]G
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().findByNamedQuery(query, parameters); d}Xr}
} fIM,lt
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publicList find(finalString query){ Tg7an&#
return getHibernateTemplate().find FX;QG94!
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(query); %9
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} i9rN9Mq?O
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publicList find(finalString query, finalObject W4t;{b
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parameter){ {WJ m
return getHibernateTemplate().find ?)/#+[xa
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(query, parameter); <'}YyU=
} *HU &4E\a
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public PaginationSupport findPageByCriteria +<'Ev~
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(final DetachedCriteria detachedCriteria){ s'3
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return findPageByCriteria [RS|gem`
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); (|F*vP'
} '"`IC\N^
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public PaginationSupport findPageByCriteria )tG\vk=@
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(final DetachedCriteria detachedCriteria, finalint *=) cQeJ
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startIndex){ k3~}7]O)
return findPageByCriteria 2L!u1
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(detachedCriteria, PaginationSupport.PAGESIZE, K:J3Z5"
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startIndex); 6=kEyJT'
} L]yS[UN$
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public PaginationSupport findPageByCriteria SfA\}@3
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(final DetachedCriteria detachedCriteria, finalint G3txj
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pageSize, .b_)%jd x
finalint startIndex){ y@1+I~@
return(PaginationSupport) >d@&2F TO
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getHibernateTemplate().execute(new HibernateCallback(){ 9X[kEl
publicObject doInHibernate u\a#{G;Z
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(Session session)throws HibernateException { w!#tTyk`
Criteria criteria = (XVw"m/ye
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detachedCriteria.getExecutableCriteria(session); Cmu@4j&
int totalCount = ih)zG
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((Integer) criteria.setProjection(Projections.rowCount oVnvO iAc
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()).uniqueResult()).intValue(); "33Fv9C#bK
criteria.setProjection 0Vj4+2?L5;
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(null); phQUD
List items = EJj.1/]|r
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criteria.setFirstResult(startIndex).setMaxResults -M~8{buxv
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(pageSize).list(); ``V"
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PaginationSupport ps = :8I9\eet3
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new PaginationSupport(items, totalCount, pageSize, vGvf<ra;H
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startIndex); d^@ dzNv
return ps; I?]ohG K
} @#<D ^"
}, true); Q`~jw>x
} ^pxX]G]
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public List findAllByCriteria(final
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DetachedCriteria detachedCriteria){ *RDn0d[
return(List) getHibernateTemplate 2SD`OABf#
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().execute(new HibernateCallback(){ tankR9(o
publicObject doInHibernate [O$Wa:< 0x
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(Session session)throws HibernateException { ?OId\'q
Criteria criteria = O $LfuL
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detachedCriteria.getExecutableCriteria(session); V n7*JS
return criteria.list(); NYt&@Z}]
} s0\X ^
}, true); ? 8)'oMD
} Jk&3%^P{m
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public int getCountByCriteria(final 6q*9[<8
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DetachedCriteria detachedCriteria){ . kQkC:~9
Integer count = (Integer) M*y)6H k~
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getHibernateTemplate().execute(new HibernateCallback(){ %u? >#
publicObject doInHibernate <S\jpB
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(Session session)throws HibernateException { "
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Criteria criteria = WgR).Yx
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detachedCriteria.getExecutableCriteria(session); vmi+_]
return bT\1>
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criteria.setProjection(Projections.rowCount IW>T}@
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()).uniqueResult(); , qA(\[
} ^.1)};i
}, true); ={_C&57N1
return count.intValue(); !\"EFVH
} qUh2hz:
} -jW.TT h]
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用户在web层构造查询条件detachedCriteria,和可选的 MV<^!W
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 "*($cQ$v
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PaginationSupport的实例ps。 wy yWyf
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ps.getItems()得到已分页好的结果集 0x'#_G65y
ps.getIndexes()得到分页索引的数组 ZNJ@F<