Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 # 1I<qK
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 *>zr'Tt,W
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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 S\s1}`pNm
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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 B1J+`R3OX
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分页支持类: X62z>mM
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java代码: 2u/(Q>#
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package com.javaeye.common.util; jHTaG%oh
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import java.util.List; C`7HC2Is
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publicclass PaginationSupport { XOVZ'V
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publicfinalstaticint PAGESIZE = 30; axonqSf
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privateint pageSize = PAGESIZE; OJQ7nChMm
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privateList items; E^T/Qu
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privateint totalCount; Q(E$;@
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privateint[] indexes = newint[0]; !W{|7Es?.
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privateint startIndex = 0; @N1ta-D#
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public PaginationSupport(List items, int bP(V#6IJ8
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totalCount){ ]oXd|[G
setPageSize(PAGESIZE); Y-7x**I
setTotalCount(totalCount); Dbz\8gmY
setItems(items); o!wz:|\S
setStartIndex(0); $1#|<|
} nS]/=xP{
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public PaginationSupport(List items, int yEzp+Ky
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totalCount, int startIndex){ A\.k['!
setPageSize(PAGESIZE); .@ /5Ln
setTotalCount(totalCount); kSoAnJ|
setItems(items); N
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setStartIndex(startIndex); %t:1)]2
} pjrVPi5&t
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public PaginationSupport(List items, int Kx ?}%@b
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totalCount, int pageSize, int startIndex){ hRtnO|Z6
setPageSize(pageSize); L'z;*N3D
setTotalCount(totalCount); 6EP5n
setItems(items); G2
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setStartIndex(startIndex); E!C~*l]wJx
} %ktU 51o
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publicList getItems(){ Eki7bT@/
return items; W~Eq_J?I
} nYTI\f/8v
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publicvoid setItems(List items){ f+-w~cN
this.items = items; YdhrFw0`~r
} RR*z3i`PP
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publicint getPageSize(){ /,c9&it(M
return pageSize; m 9.QGX\]
} (y=P-nm
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publicvoid setPageSize(int pageSize){ 6TlkPM$~2
this.pageSize = pageSize; e8--qV#<
} ib;:*
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publicint getTotalCount(){ nke[}Hqf
return totalCount; }eULcgRG
} /XtxgO\T.
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publicvoid setTotalCount(int totalCount){ )TVyRY Z1
if(totalCount > 0){ {6a";Xj\e
this.totalCount = totalCount; \/S?.P#L~
int count = totalCount / }7wQFKME
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pageSize; :X,1KR
if(totalCount % pageSize > 0) )7*Apy==x
count++; +w%MwPC7`
indexes = newint[count]; po\Q Me
for(int i = 0; i < count; i++){ cQS}pQyYN
indexes = pageSize * UTHGjE
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i; d=Q0/sI&
} y[.0L!C {
}else{ $ [M8G
this.totalCount = 0; Cf@WjgR
} <?2[]h:wp
} s{Ryh.IyI
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publicint[] getIndexes(){ wvBJ?t,
return indexes; C4#'`8E
} Qm^N}>e
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publicvoid setIndexes(int[] indexes){ n)^B0DnIk
this.indexes = indexes; li$(oA2
} G'#a&6
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publicint getStartIndex(){ ,^`+mP
return startIndex; =cX&H
} {UvZ
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publicvoid setStartIndex(int startIndex){ KZsSTB6J
if(totalCount <= 0) {CYFM[V
this.startIndex = 0; yLipuMNV
elseif(startIndex >= totalCount) pN1W|Wv2
this.startIndex = indexes xzAyE5GL>
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[indexes.length - 1]; gX.4I;
elseif(startIndex < 0) }Q/xBC)
this.startIndex = 0; 1`X{$mxw
else{ xpRQ"6
this.startIndex = indexes gM^ Hs7o,
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[startIndex / pageSize]; _LCK|H%v'
} BQ2DQ7q
} -jFvDf,M,D
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publicint getNextIndex(){ 'HH[[9Q
int nextIndex = getStartIndex() + zxT&K|
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pageSize; SHIK=&\~-
if(nextIndex >= totalCount) e#<%`\qH
return getStartIndex(); = 0Z}s
else ./rNq!*a
return nextIndex; yAW%y
} m';:):
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publicint getPreviousIndex(){ T%VC$u4F
int previousIndex = getStartIndex() - C8e{9CF
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pageSize; 6zaO$
if(previousIndex < 0) TO-[6Pq#
return0; z|<6y~5,
else wS hsu_(i
return previousIndex; Fnzv&
} L:}hZf{p*
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} tF
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抽象业务类 ;SagN
java代码: |Q@4F&k
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/** Cevl#c5p>
* Created on 2005-7-12 g-bHf]'
*/ wC}anq>>
package com.javaeye.common.business; &) T5V
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import java.io.Serializable; /hQTV!\u
import java.util.List; kL*
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import org.hibernate.Criteria; 6:fe.0H9
import org.hibernate.HibernateException; @_J~zo
import org.hibernate.Session; a{GPAzO+
import org.hibernate.criterion.DetachedCriteria; [?Cv^t${+
import org.hibernate.criterion.Projections; N!
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import .Wc<(pfa
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org.springframework.orm.hibernate3.HibernateCallback; AD_")_B|i
import zN:VT&
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org.springframework.orm.hibernate3.support.HibernateDaoS X6)-1.T&
;%0$3a
upport; x&@. [FJhO
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import com.javaeye.common.util.PaginationSupport; 1I{vBeMj
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public abstract class AbstractManager extends -r@fLkwg
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HibernateDaoSupport { ^KM' O8
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privateboolean cacheQueries = false; &CpxD."8x
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privateString queryCacheRegion; 'JU(2mF
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publicvoid setCacheQueries(boolean M ~zA
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cacheQueries){ P<ElH3J`
this.cacheQueries = cacheQueries; %M]%[4eC
} 4>-'w MW")
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publicvoid setQueryCacheRegion(String ZVs]_`(+
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queryCacheRegion){ WXV (R,*Tc
this.queryCacheRegion =
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queryCacheRegion; aMe]6cWHV>
} z$4g9
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publicvoid save(finalObject entity){ 8Wqh 8$
getHibernateTemplate().save(entity); !}[}YY?',i
} [%
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publicvoid persist(finalObject entity){ X'Q?Mh
getHibernateTemplate().save(entity); ]Wr2I M
} Z}#'.y\ f
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publicvoid update(finalObject entity){ KSDz3qe
getHibernateTemplate().update(entity); ~"|MwR!0
} `?E|frz[
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publicvoid delete(finalObject entity){ n_QSuh/Wn
getHibernateTemplate().delete(entity); )O\w'|$G
} 10R#}~D
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publicObject load(finalClass entity, ndg1E;>
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finalSerializable id){ VzD LG LH
return getHibernateTemplate().load J_NY:B
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(entity, id); [$M=+YRHMW
} K)b@,/ 5
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publicObject get(finalClass entity, #NQpr
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finalSerializable id){ &n$kVNE
return getHibernateTemplate().get /5:2g#S4
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(entity, id); _E'F
} 6<1
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publicList findAll(finalClass entity){ 3E9 )~$
return getHibernateTemplate().find("from `(tVwX4
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" + entity.getName()); ,+2!&"zD
} PWci D '!
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publicList findByNamedQuery(finalString @=_4i&]$
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namedQuery){ ,5V w^@F
return getHibernateTemplate |"}oGL6-
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().findByNamedQuery(namedQuery); HQ /D )D
} @};
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publicList findByNamedQuery(finalString query, '3<T~t
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finalObject parameter){ w'[JfMu P
return getHibernateTemplate d?:KEi-<7
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().findByNamedQuery(query, parameter); yz}ik^T
} OSoIH`tA
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publicList findByNamedQuery(finalString query, >0F)^W?
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finalObject[] parameters){ R7\T.;8+
return getHibernateTemplate Cv[_N%3[
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().findByNamedQuery(query, parameters); OQ(w]G0LP
} B]2m(0Y>>v
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publicList find(finalString query){ 5Ve`j,`=<
return getHibernateTemplate().find ^4/
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(query); )J^5?A
} @7HHi~1JK
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publicList find(finalString query, finalObject =kzuU1s
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parameter){ lA{JpH_Y8s
return getHibernateTemplate().find h;Hg/jv
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(query, parameter); e&@;hDmIX
} L"KKW
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public PaginationSupport findPageByCriteria knn9s0'Q
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(final DetachedCriteria detachedCriteria){ Nl]_Ie6
return findPageByCriteria %1mIngW=g
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ="p,~ivrz
} aT4I sPA?_
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public PaginationSupport findPageByCriteria vpq"mpfkh
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(final DetachedCriteria detachedCriteria, finalint Rp+Lu
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startIndex){ ,(i`gH{D
return findPageByCriteria q2b>Z6!5
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(detachedCriteria, PaginationSupport.PAGESIZE, s"UUo|hM
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startIndex); j/t)=c
} S
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public PaginationSupport findPageByCriteria mxnu\@}(
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(final DetachedCriteria detachedCriteria, finalint r>#4Sr
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pageSize, 2BKiA[
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finalint startIndex){ HTLS$o;Q
return(PaginationSupport) 0"}=A,o(w
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getHibernateTemplate().execute(new HibernateCallback(){ +H:}1sT;n
publicObject doInHibernate DHg)]FQ/
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(Session session)throws HibernateException { A("\m>g$b
Criteria criteria = ?[]jJ
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detachedCriteria.getExecutableCriteria(session); e:l7 w3?O
int totalCount = <a&w$Zc/
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((Integer) criteria.setProjection(Projections.rowCount {[4.<|26
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()).uniqueResult()).intValue(); tkYPfUvTE
criteria.setProjection cOf.z)kf6
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(null); :qc?FQ
;
List items = pocXQEg$]
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criteria.setFirstResult(startIndex).setMaxResults Y[N@ )E_G
6u'E}hAx|
(pageSize).list(); B)*1[Jf{4
PaginationSupport ps = :9DyABK=Cv
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new PaginationSupport(items, totalCount, pageSize,
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startIndex); Dz,|sHCmk
return ps; .,sbqL
} O5MV&Zb(
}, true); "574%\#4z
} #qu;{I#W3
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public List findAllByCriteria(final ;VzdlCZ@
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DetachedCriteria detachedCriteria){ I<Cm$8O?
return(List) getHibernateTemplate 9n49p?
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().execute(new HibernateCallback(){ riF-9
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publicObject doInHibernate ]UkqPtG;
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(Session session)throws HibernateException { t3 3\f<e
Criteria criteria = n%;4Fm?
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detachedCriteria.getExecutableCriteria(session); ykRd+H-t
return criteria.list(); HzL~B#
} mBEMwJ}O`
}, true); ]Exbuc
} k]A=Q
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public int getCountByCriteria(final qm<-(Qc(W
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DetachedCriteria detachedCriteria){ TS`m&N{i")
Integer count = (Integer) @EURp
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getHibernateTemplate().execute(new HibernateCallback(){ La28%10
publicObject doInHibernate HWIn.ij
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(Session session)throws HibernateException { od$$g(
Criteria criteria = F >H\F@Wl
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detachedCriteria.getExecutableCriteria(session); DQ}&J
return V["'eJA,,
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criteria.setProjection(Projections.rowCount k&M~yb
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()).uniqueResult(); @HTs.4
} ]heVR&bQ
}, true); .AQTUd(_
return count.intValue(); qfdL *D
} qo}yEl1
} PdEPDyFk h
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用户在web层构造查询条件detachedCriteria,和可选的 LN)yQ-
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ~Y{]yBGoF
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PaginationSupport的实例ps。 7L!}F;yT
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ps.getItems()得到已分页好的结果集 nTw:BU4jd
ps.getIndexes()得到分页索引的数组 Bp5%&T k
ps.getTotalCount()得到总结果数 t<"`gM^|
ps.getStartIndex()当前分页索引 m;nH
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ps.getNextIndex()下一页索引 A6+qS
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ps.getPreviousIndex()上一页索引 QCG-CzJ9l
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 EiP N44(
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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 &xvNR=K[`
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一下代码重构了。 [vz2< genn
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我把原本我的做法也提供出来供大家讨论吧: l: kW|
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首先,为了实现分页查询,我封装了一个Page类: 'R2*3<
java代码: =(~*8hJ
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/*Created on 2005-4-14*/ @\:@_}Z`_}
package org.flyware.util.page; S;/pm$?/
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/** yRDtPK"E-
* @author Joa O'(D:D?
* s'd\"WaQV
*/ D+N@l"U{
publicclass Page { _RS
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/** imply if the page has previous page */ \ [M4[Qlq
privateboolean hasPrePage; .Wi%V"
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/** imply if the page has next page */ 8M,z#DF
privateboolean hasNextPage; bSQj=|h1
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/** the number of every page */ >)Bv>HM
privateint everyPage; t?b@l<,s
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|*
/** the total page number */ $VP\Ac,!
privateint totalPage; /Z~$`!J
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/** the number of current page */ #)i+'L8
privateint currentPage; '
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#s#BYbF
/** the begin index of the records by the current *5 \'$;Rg
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query */ ~0o>B$xJ
privateint beginIndex; IFZw54
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/** The default constructor */ c>T)Rc
public Page(){ LF)wn-C}
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} ] yWywa\
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/** construct the page by everyPage ZN&9qw*
* @param everyPage A;6ew4
* */ ) 3V1aC
public Page(int everyPage){ XeslOsHh
this.everyPage = everyPage; ^; }Y ZBy
} gKmF#Z"\
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/** The whole constructor */ *.VNyay
public Page(boolean hasPrePage, boolean hasNextPage, 2S4SG\
*y` (^kyS
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int everyPage, int totalPage, k'sPA_|
int currentPage, int beginIndex){ b.8T<@a
this.hasPrePage = hasPrePage; YY$Z-u(
this.hasNextPage = hasNextPage; ,Ij/
^EC}
this.everyPage = everyPage; ??LE0i
this.totalPage = totalPage; 9+8N-LZ
this.currentPage = currentPage; bb+iUV|Do
this.beginIndex = beginIndex; f]C^{Uk#
} *o!#5c
p;D
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/** OB^j
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* @return MUCes3YJH
* Returns the beginIndex. (\wV)c9
*/ [M:<!QXw
publicint getBeginIndex(){ >svx
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return beginIndex; 1zCgPiAem
} CHjm7
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/** 6\VZ6oS
* @param beginIndex eOfVBF<C2
* The beginIndex to set. -D1A
*/ JL<<EPC
publicvoid setBeginIndex(int beginIndex){ F7]8*[u
this.beginIndex = beginIndex; Cy)QS{YX
} wSdiF-ue
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/** 7<K=G2_:
* @return 9%0^fhrJ
* Returns the currentPage. KFaYn
*/ |@f\[v9`
publicint getCurrentPage(){ ICc:k%wE7
return currentPage; rZ.z!10
} o,?h}@
x cZF_elt7
/** ,E@}=x9p
* @param currentPage N] pw7S%
* The currentPage to set. RX^Xtc"
*/ w6-<HPW<S
publicvoid setCurrentPage(int currentPage){ |0X~D}r|J
this.currentPage = currentPage; ta'wX
} 0bSnD|#I
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/** Gq%,'amf
* @return /#q6.du
* Returns the everyPage. FJ{&R Ld
*/ hx4c`fOs
publicint getEveryPage(){ X+N8r^&
return everyPage; Im]6-#(9\|
} @~&^1%37)
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/** D^U?!S&4~
* @param everyPage U]9k,#
* The everyPage to set. WZP1g kX&M
*/ b?,=|H
publicvoid setEveryPage(int everyPage){ QNx xW2+
this.everyPage = everyPage; [8Z
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} Ht]O:io`
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/** [F{P0({%?
* @return e nw*[D !
* Returns the hasNextPage. g+(Y)9h&
*/ &^Gp
publicboolean getHasNextPage(){ F%O+w;J4
return hasNextPage; <,U$Y>
} mHH>qW{`
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/** PR,8c
* @param hasNextPage a(G}<
* The hasNextPage to set. `lt[Q>Z
*/ : JSuC
publicvoid setHasNextPage(boolean hasNextPage){ kE[R9RS!
this.hasNextPage = hasNextPage; ,pVe@ d'
} $H&:R&Us
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/** i|28:FJA
* @return 9kbczL^Y
* Returns the hasPrePage. 6fCHd10!
*/ }'n]C| gZ
publicboolean getHasPrePage(){ 2R;#XmKS
return hasPrePage; x,fL656t
} A8:eA
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/** _g'x=VJF
* @param hasPrePage A\13*4:;l
* The hasPrePage to set. +wI<w|!
*/ yW"[}Lh4
publicvoid setHasPrePage(boolean hasPrePage){ ,K|UUosS-#
this.hasPrePage = hasPrePage; _N0N#L4M
} I<+:Ho=6
#u +~ ^M
/** HuQdQ*Q
* @return Returns the totalPage. ?0qP6'nWx
* \m:('^\6o
*/ . lNf.x#u
publicint getTotalPage(){ EG3u)}vI
return totalPage; Ynp#3 r
} 0]^gT'
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/** iO2jT+i
* @param totalPage wrsr U
* The totalPage to set. %J1oz3n
*/ Jje!*?&8X
publicvoid setTotalPage(int totalPage){ W! J@30
this.totalPage = totalPage; 7<Y aw,G
} ,ne3uPRu7~
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} ud"Kko Rt
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 0sB[]E|7[s
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个PageUtil,负责对Page对象进行构造: 8# x7q>?
java代码: Iyb_5 UmpF
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/*Created on 2005-4-14*/ Jb-.x_Bf
package org.flyware.util.page; >2X-98,
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import org.apache.commons.logging.Log; &
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import org.apache.commons.logging.LogFactory; #7/39zTK
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/** hML-zZ
* @author Joa 0Q)YZ2
* k|U2Mp
*/ Fh|{ib
publicclass PageUtil { yhs:.h
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privatestaticfinal Log logger = LogFactory.getLog {<?8Y
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(PageUtil.class); ]b:>7_la
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/** y*p02\)
* Use the origin page to create a new page IIAmx[ b
* @param page c5:X$k\
* @param totalRecords Z[eWey_
* @return 2(m#WK7>F
*/ sz%_9;`dpL
publicstatic Page createPage(Page page, int mkl^2V13~
cv7:5P
totalRecords){ fPPmUM^C9
return createPage(page.getEveryPage(), T''<y S
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page.getCurrentPage(), totalRecords); sRqecG(n
} uL^`uI#I
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/** |=MhI5gsx
* the basic page utils not including exception vo%"(!
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handler v G9>e&Be
* @param everyPage 7R# }AQ
* @param currentPage HxcL3Bh$~}
* @param totalRecords M>}_2G]#F
* @return page Qkhor-f0
*/ +'nMy"j1
publicstatic Page createPage(int everyPage, int 1aCpeD4|)
q'TIN{\.{
currentPage, int totalRecords){ &HtTh {
everyPage = getEveryPage(everyPage); o"_'cNAz
currentPage = getCurrentPage(currentPage); W|y;Kxy
int beginIndex = getBeginIndex(everyPage, 5pK
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currentPage); Hmnxmgx
int totalPage = getTotalPage(everyPage, {^1''
'$?!>HN4
totalRecords); .J O1kt
boolean hasNextPage = hasNextPage(currentPage, j#Tl\S!m.I
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totalPage); /?($W|9+l
boolean hasPrePage = hasPrePage(currentPage); ;mvVo-r*q
+.OdrvN4)
returnnew Page(hasPrePage, hasNextPage, "?<h,Hvi
everyPage, totalPage, c*(^:#"9
currentPage, 't5`Ni
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beginIndex); 3!vzkBr
} -'SA&[7dP
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privatestaticint getEveryPage(int everyPage){ N_Kdi%q
return everyPage == 0 ? 10 : everyPage; Vzo<ma^
} ;BYuNQr
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privatestaticint getCurrentPage(int currentPage){ -esQyLx
return currentPage == 0 ? 1 : currentPage; NzTF2ve(
} i^V(LGQF
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privatestaticint getBeginIndex(int everyPage, int `E?0jQ
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currentPage){
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return(currentPage - 1) * everyPage; &I[` .:NJ
} $/B~ bJC
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privatestaticint getTotalPage(int everyPage, int ,isjiy
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totalRecords){ T ~(Sc'8
int totalPage = 0; m}\QGtJ6
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if(totalRecords % everyPage == 0) p:z~>ca
totalPage = totalRecords / everyPage; i7e6l C
else 7GWOJ^)
totalPage = totalRecords / everyPage + 1 ; 7CvBE;i
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return totalPage; I.GoY[u_%
} x5mg<y2`Ng
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privatestaticboolean hasPrePage(int currentPage){ / of K7/
return currentPage == 1 ? false : true; (xRcG+3];
} : -d_
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privatestaticboolean hasNextPage(int currentPage, q!?*M?Oz
W)/^*,
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int totalPage){ "Y=`w,~~
return currentPage == totalPage || totalPage == T'@+MA) ~
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0 ? false : true; qc5[e
} #j=yQrJ
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} l-l7jq]R
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% hvK;B?Y|
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 .\glNH1d
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 L/V^ #$
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做法如下: jWv'`c
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 Np/\}J&IF
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的信息,和一个结果集List: -4&
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java代码: NX.xEW@
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/*Created on 2005-6-13*/ ,1$F#Eh
package com.adt.bo; uMS+,dXy
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import java.util.List; tmooS7\a
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import org.flyware.util.page.Page; Qop,~yK
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/** f,KB BBbG
* @author Joa cN8Fn4gq
*/ 'in%Gii
publicclass Result { v#d\YV{I
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private Page page; O'mcN*
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private List content; ~<m^
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/** c{BAQZVc
* The default constructor wG3b{0
*/ =abcLrf2G
public Result(){ yXJ25Axb
super(); DfD
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} 2!Dz9m3
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/** 4JAz{aw'b
* The constructor using fields . : Wf>:
*
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* @param page uK2HtRY1
* @param content 2Lf,~EV
*/ :_~.Nt
public Result(Page page, List content){ |Ev|A9J!
this.page = page; d8wVhZKI"
this.content = content; &aLTy&8Fv
}
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/** (WyNO QO'
* @return Returns the content. e~N&?^M
*/ fRQ,Z
publicList getContent(){ 0\P5=hD)K
return content; >.d/@3
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} o$sD9xx
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/** si]VM_w6
* @return Returns the page. Fo.Y6/}
*/ ]?tRO
public Page getPage(){ =9GALoGL
return page; Q&eyqk
} o utJ/~9;
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/** F@i>l{C
* @param content 7__[=)(b2X
* The content to set. \yr9j$
*/ p%I'd^}.!
public void setContent(List content){ i6'=]f'{
this.content = content; GfE>?mG
} d:(Ex^^
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/** a)QT#.
* @param page 1;ttwF>G7
* The page to set. 9|1msg4
*/ iBSM
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publicvoid setPage(Page page){ im2mA8OH
this.page = page; #'_#t/u
} V]F D'XAl
} 4v\HaOk
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2. 编写业务逻辑接口,并实现它(UserManager, z1mB Hz6
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UserManagerImpl) J\L'HIs
java代码: %Jt35j@Ee
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/*Created on 2005-7-15*/ EZ)b E9
package com.adt.service; .xJ54Vz
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import net.sf.hibernate.HibernateException; D$hQ-K
J:@gmo`M;V
import org.flyware.util.page.Page; )D+BvJ Y"
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import com.adt.bo.Result; #n>U7j9`O
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/** .l1x~(
* @author Joa ?+t;\
*/ ys9:";X;}
publicinterface UserManager { FS1\`#Bm)
|>;PV4])(
public Result listUser(Page page)throws ,*|Q=
9 C[~*,qx
HibernateException; Nk7y2[
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} t*IePz] /
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6!\V|
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java代码: a
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/*Created on 2005-7-15*/ Nny*C`uDF
package com.adt.service.impl; ;ElCWs->\
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import java.util.List; @xWWN
@_ %RQO_X
import net.sf.hibernate.HibernateException; cMY}Y
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rN}pi@
import org.flyware.util.page.Page; A9xeOy8e
import org.flyware.util.page.PageUtil; //63|;EEkl
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import com.adt.bo.Result; 1&bo