Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 LL_@nvu}M
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 6ltV}Wt-
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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 =X;h _GQ
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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 Vz]yJ:
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分页支持类: 9yK\<6}}QH
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java代码: 'x,6t66*"l
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package com.javaeye.common.util; ^8=e8O
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import java.util.List; i3vg7V.
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publicclass PaginationSupport { i.0d>G><@
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publicfinalstaticint PAGESIZE = 30;
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privateint pageSize = PAGESIZE; tkP& =$
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privateList items; )S9}uOG#
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privateint totalCount; mYFc53B
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privateint[] indexes = newint[0]; G6bvV*TRi
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privateint startIndex = 0; |*g\-2j{
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public PaginationSupport(List items, int
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totalCount){ eB9F35[
setPageSize(PAGESIZE); uMjL>YLq{?
setTotalCount(totalCount); g:YUuZ
setItems(items); i(4.7{*
setStartIndex(0); gNC'kCx0c
} BKK@_B"
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public PaginationSupport(List items, int 63'L58O
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totalCount, int startIndex){ NNBT.k3)
setPageSize(PAGESIZE); nK`H;k
setTotalCount(totalCount); U45-R-
setItems(items); Pf~0JNnc
setStartIndex(startIndex); *G[` T%g
} `_x#`%!#2
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public PaginationSupport(List items, int +hcJ!$J7
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totalCount, int pageSize, int startIndex){ 75iudki
setPageSize(pageSize); 2RdpVNx\y
setTotalCount(totalCount); tILnD1q
setItems(items); CdKs+x&tZ
setStartIndex(startIndex); TA+#{q+a
} SduUXHk
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publicList getItems(){ v}<z_i5/C.
return items; [$M l;K
} hVdGxT]6
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publicvoid setItems(List items){ CVZ4:p
this.items = items; 7
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} !iAZEOkRR
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publicint getPageSize(){ fVYv 2
return pageSize; O O-Obg^
} %;#9lkOXWH
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publicvoid setPageSize(int pageSize){ D=B :tP
this.pageSize = pageSize; &`_|[Y ]H
} _zLEHEZ-
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publicint getTotalCount(){
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return totalCount; +A%zFF3
} #2+hu^Q-
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publicvoid setTotalCount(int totalCount){ 7'5/T]Z
if(totalCount > 0){ d;a"rq@a)
this.totalCount = totalCount; 7o-}86x#
int count = totalCount / J?Rp
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pageSize; #+^l3hMK
if(totalCount % pageSize > 0) qz 29f
count++; hDbZ62DDN
indexes = newint[count]; ]@qD4:
for(int i = 0; i < count; i++){ [n +(
indexes = pageSize * cGWL'r)P
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} {h;i x
}else{ &A^2hPe}
this.totalCount = 0; 7>gW2m
} Si|8xq$E;
} 7A
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publicint[] getIndexes(){ ve4QS P
return indexes; %Ip=3($Ku[
} Q8DKU
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publicvoid setIndexes(int[] indexes){ 5;9.&f
this.indexes = indexes; )' 2vUt`_7
} 5hB2:$C
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publicint getStartIndex(){ =OR&,xt
return startIndex; x_EU.924uY
} &0mhO+g
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publicvoid setStartIndex(int startIndex){ 5JZZvc$au
if(totalCount <= 0) [ HjGdC
this.startIndex = 0; =IIE]<z
elseif(startIndex >= totalCount) ,=P0rbtK
this.startIndex = indexes Q?%v b
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[indexes.length - 1]; E
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elseif(startIndex < 0) @T-}\AU
this.startIndex = 0; _"'-fl98*
else{ H/ub=,Ej*
this.startIndex = indexes (7v`5|'0
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[startIndex / pageSize]; J1Y3>40
} BimM)4g
} a[gN+DX%L
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publicint getNextIndex(){ wSs78c=
int nextIndex = getStartIndex() + >2)!w
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pageSize; x[%% )[d
if(nextIndex >= totalCount) =`%%*
return getStartIndex(); {XYf"ONi
else $Vm J[EF1
return nextIndex; ~K|o@LK
} %P]-wBJw
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publicint getPreviousIndex(){ ZP%Bu2xd
int previousIndex = getStartIndex() - NO)vk+
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pageSize; L G9#D
if(previousIndex < 0) R7By=Y!t
return0; F~O!J@4]
else lc0Z fC
return previousIndex; dnTXx*I:
} ?rV c}
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} YCQ+9
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抽象业务类 Th*mm3D6
java代码: %n#^#:
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/** 4^B:Q9B)
* Created on 2005-7-12 B6vmBmN
*/ ?jzadC el
package com.javaeye.common.business; cl-i6[F
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import java.io.Serializable; UJF
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import java.util.List; Web8"8eD
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import org.hibernate.Criteria; L9U<E $%#
import org.hibernate.HibernateException; l+ <x
import org.hibernate.Session; ]t3
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import org.hibernate.criterion.DetachedCriteria; AuYi$?8|5
import org.hibernate.criterion.Projections; IN]bAd8"
import 4B}w;d@R
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org.springframework.orm.hibernate3.HibernateCallback; $RSVN?
import rQ$A|GJ L
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org.springframework.orm.hibernate3.support.HibernateDaoS M>k7
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upport; (jYs_8;
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import com.javaeye.common.util.PaginationSupport; +=@Z5eu
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public abstract class AbstractManager extends P-`^I`r
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HibernateDaoSupport { _.06^5o
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privateboolean cacheQueries = false; @kwD$%*0
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privateString queryCacheRegion; 6YU2
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publicvoid setCacheQueries(boolean =-pss 47
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cacheQueries){ :7>Si%
this.cacheQueries = cacheQueries; 1y"37;x
} U w`LWG3T
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publicvoid setQueryCacheRegion(String |_2ANWHz
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queryCacheRegion){ n8G#TQrAE
this.queryCacheRegion = 8h20*@wSN
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queryCacheRegion; 6eK^T=
} e#HP+b$
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publicvoid save(finalObject entity){ L
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getHibernateTemplate().save(entity); (Fgt #H(B
} Jp-ae0 Ewa
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publicvoid persist(finalObject entity){ kdYl>M
getHibernateTemplate().save(entity); #1bgV
} Em"X5>;4
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publicvoid update(finalObject entity){ 47K5[R
getHibernateTemplate().update(entity); 4l`gAE$
} )#ujF~w>
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publicvoid delete(finalObject entity){ V!<#E)-?<
getHibernateTemplate().delete(entity); Xp?Z;$r$
}
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publicObject load(finalClass entity, [sk"2
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finalSerializable id){ L2h+[f
return getHibernateTemplate().load _5LlL#)
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(entity, id); anwn!Eqk"
} 3 z#;0n}
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publicObject get(finalClass entity, r#}Sy\
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finalSerializable id){ Q8~pIv
return getHibernateTemplate().get q%vUEQLBp
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(entity, id); ,/ : )FV
} mDmWTq\
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publicList findAll(finalClass entity){ |5/[0V-vy
return getHibernateTemplate().find("from dbXG?K][
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" + entity.getName()); ]1[;A$7
} XN0Y#l
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publicList findByNamedQuery(finalString gPi_+-@
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namedQuery){ J@TM>R
return getHibernateTemplate 3*TS
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().findByNamedQuery(namedQuery); awK'XFk
} [Bh]\I'
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publicList findByNamedQuery(finalString query, )AoFd>
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finalObject parameter){ !jW32$YTR
return getHibernateTemplate "%]dC{
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().findByNamedQuery(query, parameter); Y"jDZG?
} aS7zG2R4H
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publicList findByNamedQuery(finalString query, I{PN6bn{>
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finalObject[] parameters){ ckk [n
return getHibernateTemplate O?WaMfS[1
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().findByNamedQuery(query, parameters); :qp"Ao{M
} Uk2q,2
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publicList find(finalString query){ XL3h ;$,
return getHibernateTemplate().find z&0V21"l
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(query); D=>^m=?0
} jb2:O,+!
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publicList find(finalString query, finalObject #c>MUC(?s:
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parameter){ !q/lgpEi
return getHibernateTemplate().find [mPdT^h
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(query, parameter); ^-!HbbVv
} "/fs%F
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public PaginationSupport findPageByCriteria N96BWgT
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(final DetachedCriteria detachedCriteria){ wVOL7vh
return findPageByCriteria ,]mwk~HeF
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); QO.gt*"
} $rEd5W&d!
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public PaginationSupport findPageByCriteria 03o3[g?
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(final DetachedCriteria detachedCriteria, finalint Y(zN
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startIndex){ `yZZP
return findPageByCriteria YoJ'=z,e
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(detachedCriteria, PaginationSupport.PAGESIZE, J#DcT@
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startIndex); ELF`uWGE
} bl?%:qb.V
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public PaginationSupport findPageByCriteria
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(final DetachedCriteria detachedCriteria, finalint S\5k'ifh
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pageSize, ;
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finalint startIndex){ Ch9!AUiR
return(PaginationSupport) \]A;EwC4C
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getHibernateTemplate().execute(new HibernateCallback(){ vqOLSE"t*O
publicObject doInHibernate ~!F4JRf
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(Session session)throws HibernateException { Xb-c`k~_
Criteria criteria = ,nR8l
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detachedCriteria.getExecutableCriteria(session); }~r6>7I
int totalCount = X,+}syK
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((Integer) criteria.setProjection(Projections.rowCount 6.s?
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()).uniqueResult()).intValue(); rDX'oP:
criteria.setProjection {IHK<aW
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(null); cC^C7AAq^
List items = ;kW}'&Ug
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criteria.setFirstResult(startIndex).setMaxResults UX`DZb+^
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(pageSize).list(); *P R_Y=v%
PaginationSupport ps = .l=*R7~EU
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new PaginationSupport(items, totalCount, pageSize, |zq!CLjD@
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startIndex); Rgfhs[Z
return ps; }K80G~O2<
} ^Lmc%y
}, true); C'czXZtn
} nQ17E{^pR
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public List findAllByCriteria(final Z3So|M{v
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DetachedCriteria detachedCriteria){ CEuk1$
return(List) getHibernateTemplate M:Y*Tb6w
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().execute(new HibernateCallback(){
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publicObject doInHibernate j'Y"/<
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(Session session)throws HibernateException { .k,Jt+
Criteria criteria = )ko{S[gG
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detachedCriteria.getExecutableCriteria(session); :~3{oZGX&
return criteria.list(); f\);HJbg
} M"5!s,
}, true); kq%gY
} P%@rH@^Y
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public int getCountByCriteria(final Z1$];Q\cX
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DetachedCriteria detachedCriteria){ fb"J Bc}X
Integer count = (Integer) 6~F#F)C'
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getHibernateTemplate().execute(new HibernateCallback(){ P%+or *
publicObject doInHibernate Wda\a.bXT
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(Session session)throws HibernateException { 0L0Jc,(F+
Criteria criteria = 3Wb2p'V7$?
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detachedCriteria.getExecutableCriteria(session); )'!ml
return kV\-%:-
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criteria.setProjection(Projections.rowCount }kCn@
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()).uniqueResult(); `[@^m5?b-
} 2rO)qjiH
}, true); M*O(+EM
return count.intValue(); IQw
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} 974eY
} PPCTc|G
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用户在web层构造查询条件detachedCriteria,和可选的 eMN+qkvH
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 L7Qo-
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PaginationSupport的实例ps。 a*6wSAA )
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ps.getItems()得到已分页好的结果集 u%=bHg
ps.getIndexes()得到分页索引的数组 niYz9YX
ps.getTotalCount()得到总结果数 jy!f{dsC
ps.getStartIndex()当前分页索引 Eg`R|CF
ps.getNextIndex()下一页索引 W1?!iE~tO
ps.getPreviousIndex()上一页索引 2{mY:\
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 P?q
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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 JlC<MQ?
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一下代码重构了。 &;ZC<