Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ?%Pi#%P
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根
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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 j3
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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 %~Wr/TOt+
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分页支持类: &D7Mv5i0@
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java代码: ^w
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package com.javaeye.common.util; W=K+kB
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import java.util.List; Qz<i{r-z
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publicclass PaginationSupport { S)^eHuXPI
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publicfinalstaticint PAGESIZE = 30; ch/DBu
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privateint pageSize = PAGESIZE; -}>H3hr
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privateList items; Sjmq\A88dc
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privateint totalCount; Ige*tOv2
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privateint[] indexes = newint[0]; llpgi,-=
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privateint startIndex = 0; T'14OU2N{Y
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public PaginationSupport(List items, int "(;t`,F
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totalCount){ j|r$!gV
setPageSize(PAGESIZE); *.-qbwOg
setTotalCount(totalCount); OV7SLf
setItems(items); n*eqM2L
setStartIndex(0); pG$l
} xHn "D@
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public PaginationSupport(List items, int uX&Tn1Kg
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totalCount, int startIndex){ ((fFe8Rn)q
setPageSize(PAGESIZE); vPu{xy
setTotalCount(totalCount); M9(Kxux#
setItems(items); QLH6Nmk
setStartIndex(startIndex); +Jq~39
} zj;KtgcE
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public PaginationSupport(List items, int )dRBI)P
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totalCount, int pageSize, int startIndex){ 8H{9
setPageSize(pageSize); 8-Z|$F"
setTotalCount(totalCount); 0(|36;x
setItems(items); )KN]"<jB
setStartIndex(startIndex); `n%8y I%
} v-}D>)M^W
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publicList getItems(){ kNUNh[
return items; SKSI\]Cc
} 4AN(4"$N
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publicvoid setItems(List items){ 2D{`AJ
this.items = items; R lmeZy4.
} U{0!
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publicint getPageSize(){ l]geQl:7`r
return pageSize; ^A t,x
} &jF[f4:7
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publicvoid setPageSize(int pageSize){ G-RE
this.pageSize = pageSize; t",b.vki\z
} {pk&dB _Bu
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publicint getTotalCount(){ HVM(LHm=:
return totalCount; NYF
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} O['5/:-
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publicvoid setTotalCount(int totalCount){ qyY]:
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if(totalCount > 0){ Q|W~6
this.totalCount = totalCount; RjG=RfB'V
int count = totalCount / /8s>JPXKH[
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pageSize; pm'i4!mY<P
if(totalCount % pageSize > 0) U$6(@&P!
count++; W0N*c*k
indexes = newint[count]; 2[Bw+<YA`
for(int i = 0; i < count; i++){ |&0Cuwt
indexes = pageSize * #9@UzfZAwT
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i; b:6e2|xf?
} p!p:LSk"/b
}else{ ,Zs*07!$f
this.totalCount = 0; 4k=LVu]Kcr
} Q~$hx{foN
} Gq;!g(
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publicint[] getIndexes(){ $or8z2d1
return indexes; 9{n?Jy
} |Ht~o(]&&/
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publicvoid setIndexes(int[] indexes){ G297)MFF
this.indexes = indexes; C_V5.6T!
} 4j-%I7
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publicint getStartIndex(){ MDOP2y`2i
return startIndex; +>o}
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} J I[9c,N
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publicvoid setStartIndex(int startIndex){ bRK[u\,
if(totalCount <= 0) 0z=^_Fb
this.startIndex = 0; '645Fr[lg
elseif(startIndex >= totalCount) WRfhxl
this.startIndex = indexes 3^p;'7x
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[indexes.length - 1]; ./E<v
elseif(startIndex < 0) u75(\<{
this.startIndex = 0; >iFi~)i_4y
else{ GF^?#Jh
this.startIndex = indexes >`D$Jz,
dp#'~[ j
[startIndex / pageSize]; Lsz)\yIPj
} s<fzk1LZ
} n*vhCeL
.
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publicint getNextIndex(){ dpI! {'"M
int nextIndex = getStartIndex() + !ZTBiC5R
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pageSize; Bq#B+JwX
if(nextIndex >= totalCount) K._*
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return getStartIndex(); gqQ"'SRw
else QAKA3{-(
return nextIndex; nM6/c
} ;\)N7SJ
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publicint getPreviousIndex(){ p+O,C{^f
int previousIndex = getStartIndex() - ]R8JBnA
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pageSize; cXG$zwS\
if(previousIndex < 0) Q[.HoqWK
return0; ?cD2EX%(
else >p@v'h/Cr
return previousIndex; \} +b_J6-
} zkmfu~_)
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} t{Xf3.
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抽象业务类 P`!31P#]L
java代码: kC4}@{4i
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/** s2Hx?~
* Created on 2005-7-12 6F4OISy%3
*/ VLs%;|`5D
package com.javaeye.common.business; ;$$.L
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import java.io.Serializable; *Z
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import java.util.List; Hlye:.$
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import org.hibernate.Criteria; bO\E)%zp
import org.hibernate.HibernateException; a>XlkkX
import org.hibernate.Session; $3Srr*
import org.hibernate.criterion.DetachedCriteria; qJf=f3
import org.hibernate.criterion.Projections; :Vl2\H=P
import ;Alw`'
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org.springframework.orm.hibernate3.HibernateCallback; <\C/;
import }qn@8}
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org.springframework.orm.hibernate3.support.HibernateDaoS 0)T`&u3!
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upport; hj|P*yKV
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import com.javaeye.common.util.PaginationSupport; U|}Bk/0.
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public abstract class AbstractManager extends =`%"-A
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HibernateDaoSupport { !<I3^q
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privateboolean cacheQueries = false; t;e+WZkV
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privateString queryCacheRegion; oD>j26Q
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publicvoid setCacheQueries(boolean q=(.N>%
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cacheQueries){ |'" 17c&
this.cacheQueries = cacheQueries; ;&v~tD7
} ri?>@i-9=
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publicvoid setQueryCacheRegion(String $^;b
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queryCacheRegion){ 3A>Bnb
this.queryCacheRegion = <qpDAz4k
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queryCacheRegion; s#*T(pY
} \vQjTM-7
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publicvoid save(finalObject entity){ 4W$t28)
getHibernateTemplate().save(entity); .uGvmD<;x
} X[Q:c4'
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publicvoid persist(finalObject entity){ q" aUA_}\
getHibernateTemplate().save(entity); \uTy\KA
} 4Cl41a
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publicvoid update(finalObject entity){ ;mw$(ZKa#
getHibernateTemplate().update(entity); _K5R?"H0
} <5wk~|@t
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publicvoid delete(finalObject entity){ =Pu;wx9
getHibernateTemplate().delete(entity); 9;*-y$@
} &>]c"?C*
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publicObject load(finalClass entity, FhkS"y
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finalSerializable id){ ,m)k;co^
return getHibernateTemplate().load [hl8LP+~
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(entity, id); tB i16=
} R&`; C<6}D
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publicObject get(finalClass entity, wxx3']:
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finalSerializable id){ y$7vJl.uS/
return getHibernateTemplate().get 8:)W!tr
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(entity, id); ;I^+u0ga
} g*& |Eq/
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publicList findAll(finalClass entity){ c4'k-\JvT
return getHibernateTemplate().find("from f1_b``M
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" + entity.getName()); c{X:0man
} lPywrTG0
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publicList findByNamedQuery(finalString %Ct^{k~1
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namedQuery){ O^+H:Y|
return getHibernateTemplate yD-L:)@"
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().findByNamedQuery(namedQuery); UHh7x%$n
} c\\'x\J7
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publicList findByNamedQuery(finalString query, AJ0
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finalObject parameter){ ]?#E5(V@x
return getHibernateTemplate % >\v6ea
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().findByNamedQuery(query, parameter); sG6ts,={
} t(RJc
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publicList findByNamedQuery(finalString query, {Hu@|Q\~&
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finalObject[] parameters){ ls928
return getHibernateTemplate |v6kZ0B<
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().findByNamedQuery(query, parameters); ^z%ShmM&LZ
} b,tf]Z-
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publicList find(finalString query){ A./VO
return getHibernateTemplate().find `v|w&ty*
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(query); z3bRV{{YqN
} iW
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publicList find(finalString query, finalObject rEF0A&5
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parameter){ '=Z]mi/aw
return getHibernateTemplate().find C2[* $ 1U
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(query, parameter); 1[g -f,
} @ gv^
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public PaginationSupport findPageByCriteria YXi'^GU@
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(final DetachedCriteria detachedCriteria){ o^!_S5zKe.
return findPageByCriteria !'jZ
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); +~x'1*A_
} KqD]GS#(
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public PaginationSupport findPageByCriteria hT0[O
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(final DetachedCriteria detachedCriteria, finalint ]+
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startIndex){ EDA%qNd]j
return findPageByCriteria S#{jyU9 ]
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(detachedCriteria, PaginationSupport.PAGESIZE, cR*5iqA
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startIndex); :< d.
} l:i&l?>_
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public PaginationSupport findPageByCriteria Tx19\\r
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(final DetachedCriteria detachedCriteria, finalint Mxmo}tt
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pageSize, X9-WU\?UC
finalint startIndex){ nqFJNK]a
return(PaginationSupport) ){I0
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getHibernateTemplate().execute(new HibernateCallback(){ -91*VBrOd
publicObject doInHibernate yd|ro G/
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(Session session)throws HibernateException { d$H
Criteria criteria = hb. ^&
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detachedCriteria.getExecutableCriteria(session); Lhz*o6)
int totalCount = Sk6B>O <:
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((Integer) criteria.setProjection(Projections.rowCount '-l.2IUyT
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()).uniqueResult()).intValue(); V'q?+p]
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criteria.setProjection _u{z$;
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(null); #aua6V!"
List items = z8@[]6cW
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criteria.setFirstResult(startIndex).setMaxResults B4Fuvi
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(pageSize).list(); V"Sa9P{y"
PaginationSupport ps = m4r<=o
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new PaginationSupport(items, totalCount, pageSize, euyd(y$'k
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startIndex); &Yklf?EZ>Q
return ps; i<b-$9
} Q;xJ/4 Z"
}, true); L[cP2X]NQ
} o}p^q:T*
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public List findAllByCriteria(final B6 yTD7
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DetachedCriteria detachedCriteria){ WbWEgd%8.
return(List) getHibernateTemplate }WV}in0
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().execute(new HibernateCallback(){ T!ww3d
publicObject doInHibernate (U B?UJc
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(Session session)throws HibernateException { YW2h#PV6_
Criteria criteria = sW,JnR
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detachedCriteria.getExecutableCriteria(session); dJjkH6%}
return criteria.list(); M-8`zA2
} 4Jf9N'
}, true); r,HIoeAKP
} ~+)>D7
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public int getCountByCriteria(final 6Vj=SYK
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DetachedCriteria detachedCriteria){ 8Drz
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Integer count = (Integer) ictV7)
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getHibernateTemplate().execute(new HibernateCallback(){ ]5r@`%9
publicObject doInHibernate 2}n7f7[/b
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(Session session)throws HibernateException { b+CJRB1
Criteria criteria = pft-.1py
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detachedCriteria.getExecutableCriteria(session); +ag_ w}
return ph$vP;}
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criteria.setProjection(Projections.rowCount DF>3)oTF
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()).uniqueResult(); h343$,))u
} ?C`r3
}, true); 1\a.o[g3e
return count.intValue(); Ms#rvn!J
} TwsI8X
} (6Ciqf8
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用户在web层构造查询条件detachedCriteria,和可选的 }xry
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 #jh5% @
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PaginationSupport的实例ps。 \(RD5@=!4#
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ps.getItems()得到已分页好的结果集 K3Bw3j 9
ps.getIndexes()得到分页索引的数组 @qpj0i+>*
ps.getTotalCount()得到总结果数 Z5p
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ps.getStartIndex()当前分页索引 B Dp")[l
ps.getNextIndex()下一页索引 fTso[r:F.
ps.getPreviousIndex()上一页索引 Cs(sar:7
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ;NH^+h
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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 L+*:VP6WD
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一下代码重构了。 +TyN;e
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我把原本我的做法也提供出来供大家讨论吧: lWecxD$
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首先,为了实现分页查询,我封装了一个Page类: ]B UirJ,2
java代码: DR{O.TX
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/*Created on 2005-4-14*/ co~NXpqg
package org.flyware.util.page; \+#EO%sN1%
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/** ]'"Sa<->
* @author Joa
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* x\U[5d
*/ Ix6\5}.c 9
publicclass Page { [@ev%x,
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/** imply if the page has previous page */ !6 L!%Oi
privateboolean hasPrePage; i6KB\W2
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/** imply if the page has next page */ ol*,&C:{
privateboolean hasNextPage; TIxOMY y
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/** the number of every page */ [8a(4]4
privateint everyPage; yKoZj
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/** the total page number */ 0U@#&pUc
privateint totalPage; ~f(5l.
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/** the number of current page */ Q(]m1\a
privateint currentPage; 0M"n
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/** the begin index of the records by the current gDVsi
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query */ fJ[ ^_,O
privateint beginIndex; X'jyR:ut#
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/** The default constructor */ )b #5rQ
public Page(){ dazNwn
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} -0d9,,c
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/** construct the page by everyPage L@{'J
* @param everyPage q* p
* */ X|T|iB,vT
public Page(int everyPage){ ywAvqT,
this.everyPage = everyPage; oI{.{]
} l.o/H|
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/** The whole constructor */ |${4sUR
public Page(boolean hasPrePage, boolean hasNextPage, ~j'D%:[+VH
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int everyPage, int totalPage, =G:Krc8w@
int currentPage, int beginIndex){ q*UHzE:LI
this.hasPrePage = hasPrePage; %xlpOR4
this.hasNextPage = hasNextPage; F<,pAxl~@
this.everyPage = everyPage; <=">2WP{
this.totalPage = totalPage; ?Fl}@EA#M
this.currentPage = currentPage; ik(Du/
this.beginIndex = beginIndex; wuH*a3(
} }QCnN2bV
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/** ]zol?
* @return ,%TBW,>
* Returns the beginIndex. >J7slDRo
*/ ~#sD2b`0
publicint getBeginIndex(){ =HCEUB9Fs
return beginIndex; v0\l~_|H
} .t_t)'L
CM_hN>%w[
/** ;d6Dm)/(
* @param beginIndex bFG~08Z ,d
* The beginIndex to set. 0V1GX~2
*/ F0<)8{s
publicvoid setBeginIndex(int beginIndex){ 2t\0vV2)/O
this.beginIndex = beginIndex; =wh[D$n$~
} YCbvCw$Ob
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/** >9{?]x
* @return eA4D.7HDK
* Returns the currentPage. g{Hgs
*/ )q=F_:$
publicint getCurrentPage(){ $X#y9<bW
return currentPage; 9r? Z'~,Za
} oVvA`}
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/** /Q;wz!V$
* @param currentPage 4H#-2LV`
* The currentPage to set. hTtn
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*/ Z=]SAK`
publicvoid setCurrentPage(int currentPage){ OIP]9lM$nC
this.currentPage = currentPage; CPOHqK`k
} aJ+V]WmA
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/** '#+&?6 p
* @return cU6*y!}9
* Returns the everyPage. oPKLr31zt
*/ w5%Yi{
publicint getEveryPage(){ B->AY.&j
return everyPage; jKq*@o~}
} Tvx1+0Z%z
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/** MNu0t\`p4
* @param everyPage 1[!:|=
* The everyPage to set. :A zT=^S
*/ 8%9 C<+.R
publicvoid setEveryPage(int everyPage){ JIyS e:p3
this.everyPage = everyPage; %>m.Z#R(
} u9!
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/** bIU.C|h@
* @return 2o SM|
* Returns the hasNextPage. {:1j>4m2
*/ L I<S
publicboolean getHasNextPage(){ 8c9HJ9vk
return hasNextPage; ,Wlt[T(.;
} *~^63Nx!
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/** {+J{t\`
* @param hasNextPage |N&t
* The hasNextPage to set. ^FLs_=E
*/ i7#4&r
publicvoid setHasNextPage(boolean hasNextPage){ g{'f%bkG
this.hasNextPage = hasNextPage; '7?Y+R@|L
} QEr<(wM-y
Fl`U{03
/** ng%[yY
* @return eh9?GUr5
* Returns the hasPrePage.
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*/
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publicboolean getHasPrePage(){ @ VWED
return hasPrePage; -pC'C%Q
} \bARp z?a
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/** p":u]Xgb
* @param hasPrePage Y9^l|,bm5
* The hasPrePage to set. d,^O[9UWo
*/ 16L YVvmW
publicvoid setHasPrePage(boolean hasPrePage){ ;I4vPh5Q
this.hasPrePage = hasPrePage; 5MnP6(3$
} ?06gu1z/
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/** a`'>VCg
* @return Returns the totalPage. R #wZW&N
* #tV1?q
*/ R%jOgZG
publicint getTotalPage(){ m!xvWqY+
return totalPage; I-R7+o
} AX v
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/** M{jXo%C
* @param totalPage lx+;<la
* The totalPage to set. 6&$.E! z
*/ HA0!>_I dC
publicvoid setTotalPage(int totalPage){ .)tv'V/
this.totalPage = totalPage; :H&Q!\a
} JK!(\Ae.
u !BU^@ P
}
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 v[
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+
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个PageUtil,负责对Page对象进行构造: <MS>7Fd2
java代码: =p;cJ%#2]'
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/*Created on 2005-4-14*/ E>_Rsw *
package org.flyware.util.page; T~xVHk1
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import org.apache.commons.logging.Log; \Eh5g/,[
import org.apache.commons.logging.LogFactory; %r[`HF>
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/** /l7 %x.
* @author Joa 5ngs1ZF@
* &oMEz 0
*/ )|=1;L
publicclass PageUtil { F${sEtH
.!4'Y}
privatestaticfinal Log logger = LogFactory.getLog (1CP]5W
4 ?BQ&d
(PageUtil.class); $s_k/dM~&
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/** Cj>HMB}
* Use the origin page to create a new page o+|>D&CW%
* @param page uf?;;wg
* @param totalRecords Hdyl]q-(P
* @return #K^hKx9
*/ 0o8`Y
publicstatic Page createPage(Page page, int Uc!k)o#=
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totalRecords){ . gy:Pl]w
return createPage(page.getEveryPage(), W<q<}RSn
N #v[YO`.
page.getCurrentPage(), totalRecords); ,It0brF
} Kii@Z5R_?
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/** vEx'~_+a9
* the basic page utils not including exception ?Q_ @@)
wbWC &X.
handler g}`g>&l5
* @param everyPage JcRxNH
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* @param currentPage B6F!"
* @param totalRecords ?*V\
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* @return page N%Bl+7,q
*/ !Mw/j`*
publicstatic Page createPage(int everyPage, int 3fLdceT
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currentPage, int totalRecords){ k:n{AoUc
everyPage = getEveryPage(everyPage); ds*gL ~k^
currentPage = getCurrentPage(currentPage); 5%D`y|
int beginIndex = getBeginIndex(everyPage, O\7x+^.
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currentPage); lfBCzxifC
int totalPage = getTotalPage(everyPage, -)%\$z
'R1C-U3w,
totalRecords); 1[OY -G
boolean hasNextPage = hasNextPage(currentPage, UZ/LR
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totalPage); SkV pZh
boolean hasPrePage = hasPrePage(currentPage); #N3*SE
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returnnew Page(hasPrePage, hasNextPage, T}\>8EEG
everyPage, totalPage, u"5/QB{
currentPage, %o9mG<.T
iM!V4Wih6
beginIndex); CXn?~m&K
} 7VfXE/
+;!^aNJ,
privatestaticint getEveryPage(int everyPage){ &5jc
&CS
return everyPage == 0 ? 10 : everyPage; qh bagw~
} ,ng/T**@G
6!)hl"
privatestaticint getCurrentPage(int currentPage){ 0F uj-q
return currentPage == 0 ? 1 : currentPage; atZNX1LD[/
} B_#M)d
O
qKXg'1#E)
privatestaticint getBeginIndex(int everyPage, int Af]BR_-
Mb_"M7
currentPage){ 0<A*I{,4L
return(currentPage - 1) * everyPage; k'.cl^6Z8
} j}lne^ h
3I'7+?@@l
privatestaticint getTotalPage(int everyPage, int `?&C5*P
Nba1!5:M
totalRecords){ GwgY{-|`
int totalPage = 0; 6I~M8Lo;
Oc~<`C~
if(totalRecords % everyPage == 0) .4 NcaMj
totalPage = totalRecords / everyPage; \xOYa
else &B8x0 yi
totalPage = totalRecords / everyPage + 1 ; /"!ck2d&1
&iuMB0rbu
return totalPage; Ai%Wt-
} rf/]VAK
1.2qh"#
privatestaticboolean hasPrePage(int currentPage){ %7[d5[U~ZA
return currentPage == 1 ? false : true; `j2|aX
%Z*
} v*y,PY1*
M;g"rpM
privatestaticboolean hasNextPage(int currentPage, 5[6{o$I
}lkU3Pf1U
int totalPage){ NHdNCHhA>-
return currentPage == totalPage || totalPage == nKwOSGPQt
9nd,8Nji
0 ? false : true; 7Or?$
} \J~@r1
@gx]3t*]I
&x.5TDB>%
} +s+E!= s
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lA,[&
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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。 q\s>Oe6$
-<\hcV`&
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 i:R_g]
6
#jpA.;
做法如下: 0d,&)
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 1VXn`O?LW
U4NA'1yo
的信息,和一个结果集List: DS<E:'N
java代码: c=B!\J<1
2G/CN"
I~M@v59C
/*Created on 2005-6-13*/ n~yhX%=_Du
package com.adt.bo; yEL5U{
Cm6%wAzC
import java.util.List; yD^Q&1
Eye.#~
import org.flyware.util.page.Page; /n9,XD&)
w2]]##J
/** 78zwu<ET
* @author Joa O1z3(
*/ ;0 9~#Wop
publicclass Result { \BdQ(rm
2$>
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private Page page; Q[% +y.
WD'[|s\
private List content; x)2ZbIDB:"
Ix+\oq,O
/** ";/,FUJJ
* The default constructor }C{wGK+o[
*/ >~* w
public Result(){ I#:4H2H6
super(); 5uvFCY./c
} UV)!zgP
oAq<ag\qV
/** ":Ll.=!
* The constructor using fields /-C6I:
* )tR@\G >%
* @param page kiR+ Dsl
* @param content #s]` jdc
*/ i{nFk',xX
public Result(Page page, List content){ ,mvU`>Ry
this.page = page; {w VJv1*l
this.content = content; J*"G*x#u
} i| OG#PsY-
[<A|\d'x
/** r2xIbZ
* @return Returns the content. ^@n?&
*/ i.6+CA
publicList getContent(){ fg0zD:@rA
return content; vvcA-k?
} C.q4rr
`l`)Cs;a
/** J^<}fRw
* @return Returns the page. ,e5#wz
*/ B|6_4ry0U
public Page getPage(){ YgW 50)q^
return page;
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} s^Rig[
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/** +{pS2I}d
* @param content `oGL==
* The content to set. `KUl
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*/ O7D61~G]
public void setContent(List content){ !1cVg
ls|
this.content = content; W]=$0'
} 7,&M6<~
MY"8!
/** wj#A#[e
* @param page E\dJb}"x %
* The page to set. W"*~1$vf
*/ y?@(%PTp
publicvoid setPage(Page page){ -"MB(`
this.page = page; $%BNoSK
} $`Hb-
} pu?D^h9/
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R8![
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2. 编写业务逻辑接口,并实现它(UserManager, p`2w\P3;)
$~FnBD%|{
UserManagerImpl) |v31weD8
java代码: [/IN820t
MiB}10
o+I'nFtnI
/*Created on 2005-7-15*/ 2{fPQQ;#
package com.adt.service; a1yGgT a?D
S<bsrS*$
import net.sf.hibernate.HibernateException; %RX}sS
oQ"J>`',
import org.flyware.util.page.Page; G~N$bF^R)
qVMBZ\`Qm
import com.adt.bo.Result; 0; BX
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/** }Z Nyd
* @author Joa (D1$ &
*/ QdtGFY4f,
publicinterface UserManager { C|hD^m
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public Result listUser(Page page)throws ,J)wn;@
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HibernateException; ?|,-Bft3
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} N~t4qlC/
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%Q s
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j8#xNA
java代码: (>a8h~Na
uEX+j
}{S
f*
/*Created on 2005-7-15*/ V4>qR{5
package com.adt.service.impl; bj$VYS"kY
q9iHJ'lMD*
import java.util.List; E@%9u#
nXFPoR)T
import net.sf.hibernate.HibernateException; 2SV}mK U
' zz^!@
import org.flyware.util.page.Page; Oi-=
Fp
import org.flyware.util.page.PageUtil; PRQEk.C
OuuN~yC
import com.adt.bo.Result; ILyI%DA &
import com.adt.dao.UserDAO; Ka+N5 T.f
import com.adt.exception.ObjectNotFoundException; ;VW->ia6
import com.adt.service.UserManager; ,!7\?=G6}v
g;mX {p_@
/** (YC{BM}
* @author Joa :HW\awv
*/ B57MzIZi]
publicclass UserManagerImpl implements UserManager { 7*I:cga
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private UserDAO userDAO; 3GVS-?
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/** /(jG9RM
* @param userDAO The userDAO to set. `% ulorS
*/ "%E<%g
publicvoid setUserDAO(UserDAO userDAO){ tQ7:4._
this.userDAO = userDAO; Ygs:Ox"[-G
} >O$JS,
PL|zm5923
/* (non-Javadoc) 3)0z( 30
* @see com.adt.service.UserManager#listUser rm?C_
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(org.flyware.util.page.Page) Fz.Ij'8.H
*/ qac8zt#2
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public Result listUser(Page page)throws U!O"f
`W9~u: F
HibernateException, ObjectNotFoundException { CAa&,ZR
int totalRecords = userDAO.getUserCount(); 57(5+Zme
if(totalRecords == 0) )\RG
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throw new ObjectNotFoundException )j\9IdkU;y
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("userNotExist"); 5hj
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page = PageUtil.createPage(page, totalRecords); B]#^&89wG)
List users = userDAO.getUserByPage(page); ;6}> Shs
returnnew Result(page, users); 7xh91EU:4
} 2|\WaH9P
<i~=-Z(
} 31&;3?3>
rd1EA|T
iiLDl
P{+,?X\
Oj8xc!d'
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 y&L Lx[8^
u9u'!hAGH
询,接下来编写UserDAO的代码: }uiD8b{I
3. UserDAO 和 UserDAOImpl: vlC$0P
java代码: Ejt?B')aB5
i6P'_
aIo%~w
/*Created on 2005-7-15*/ 66{Dyn7J~
package com.adt.dao; 9c{T|+]
R5N~%Dg)3
import java.util.List; ]]9VI0
)(+q~KA}
import org.flyware.util.page.Page; ~A_1he~
{sW>J0
import net.sf.hibernate.HibernateException; -,q
qQf
_0o65?F
/** 0@wXE\s
* @author Joa HdRwDW@7=
*/ \3T[Cy|5|
publicinterface UserDAO extends BaseDAO { cq~~a(IS
49=L9:
publicList getUserByName(String name)throws Ze?n Q-
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HibernateException; 0IyT(1hS
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publicint getUserCount()throws HibernateException; D< 0))r
@$1jp4c
publicList getUserByPage(Page page)throws :cKdl[E4z
7LsVlT[
HibernateException; 7c83g2|%
" ~q~)T1Z
} e_}tK1XY
M'JCT'(X
)JhB!P(
p\Fxt1Y@X
U$WGe >,
java代码: gOr%N!5
]IH1_?HgP7
p@ U[fv8u
/*Created on 2005-7-15*/ 0xH&^Ia1B
package com.adt.dao.impl; k\Y*tY#2
4'"WD0
import java.util.List; OVGB7CB]S
9\uBX.]x
import org.flyware.util.page.Page; vlFq-W!
i,rX.K}X
import net.sf.hibernate.HibernateException; <{i1/"k?X
import net.sf.hibernate.Query; Y]!&, e,
eQ*zi9na
import com.adt.dao.UserDAO; sl:1P^b
a%/D~5Z
/** v8zO Y#?
* @author Joa rONz*ly|i
*/ *y', eB
public class UserDAOImpl extends BaseDAOHibernateImpl @}pcj2K#
E=91k.
implements UserDAO { 6{I6'+K~
0"Zxbgu)
/* (non-Javadoc) 4'td6F
* @see com.adt.dao.UserDAO#getUserByName q2s=>J';
dptfIBYc+
(java.lang.String) o#>Mf464I
*/ WWC&-Ni
publicList getUserByName(String name)throws 5n1`$T.WG
n2|@Hz_
HibernateException { yCuLo`
String querySentence = "FROM user in class IC1nR
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J:OP*/@='
com.adt.po.User WHERE user.name=:name"; 5 Pf)&iG
Query query = getSession().createQuery q=*bcDu
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(querySentence); QEMT'Cs
query.setParameter("name", name); ^XG$?2<U
return query.list(); 2:<H)oB
} (" +clb`
3i\Np =
/* (non-Javadoc) <[w5M?n8
* @see com.adt.dao.UserDAO#getUserCount() YW"uC\kg|
*/ x U"g~hT
publicint getUserCount()throws HibernateException { *IIA"tC
int count = 0; CugZ!>;^
String querySentence = "SELECT count(*) FROM f>e0l'\
1K(mdL{m5
user in class com.adt.po.User"; Fnay{F8z
Query query = getSession().createQuery /F46Ac}I
\<dg
(querySentence); 7{7Y[F0
count = ((Integer)query.iterate().next r4<As` &
6uKP
BL@,
()).intValue(); h<bhH=6~
return count; hwA&SS
} r^H,H'BohJ
9XKqsvdS
/* (non-Javadoc) !\'H{,G
* @see com.adt.dao.UserDAO#getUserByPage %yd(=%)fMB
<P/odpmc
(org.flyware.util.page.Page) n-{ d7haOa
*/ \3"B$Sp|=
publicList getUserByPage(Page page)throws \S1W,H|
&5XEjY>@
HibernateException { SlHDBr!.z
String querySentence = "FROM user in class f=VlO d
=f [/Pv
com.adt.po.User"; iX<" \pV
Query query = getSession().createQuery r=SCbv
2`j{n\/
(querySentence); fD3'Ye<R
query.setFirstResult(page.getBeginIndex()) {qU;;`P]|
.setMaxResults(page.getEveryPage()); T>7N "C
return query.list(); }fv7WhQ
} lpS v
#I*{_|}=
} D~Ef%!&
O[{/P:a
e+F$fQt>
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)?7/fF)@|
至此,一个完整的分页程序完成。前台的只需要调用 R4P&r=?
5k9
vYW5k
userManager.listUser(page)即可得到一个Page对象和结果集对象 nB5\ocJ
Gqc6]{
的综合体,而传入的参数page对象则可以由前台传入,如果用 V5i}^%QSs
q5JQx**g
webwork,甚至可以直接在配置文件中指定。 d*VvQU8C
aXG|IN5 *m
下面给出一个webwork调用示例: -Eig#]Se3
java代码: e$WAf`*
8x LXXB
sD2,!/'
/*Created on 2005-6-17*/ g/ShC8@=u
package com.adt.action.user; Rm}5AJ
WT")tjVKA
import java.util.List; a5saN5)H
5c(g7N
import org.apache.commons.logging.Log; (aC=,5N
import org.apache.commons.logging.LogFactory; Otx>S' 5
import org.flyware.util.page.Page; i$$h6P#
9I2&Vx=DSt
import com.adt.bo.Result; hkm}oYW+
import com.adt.service.UserService; =$^90Q,Z;
import com.opensymphony.xwork.Action; !g6=/9
zPybPE8
/** 7l/lY-zO
* @author Joa @mv
G=:k
*/ Ba5*]VGG
publicclass ListUser implementsAction{ S)wP];]`K
{r$Ewc$Yb7
privatestaticfinal Log logger = LogFactory.getLog QV HI}3~
X>Q4 4FV!
(ListUser.class); LAnC8O
On~KTt3Mp
private UserService userService; a#i|)[
%72(gR2Wa2
private Page page; zv0sz])
V*fv>f:Yv
privateList users; F[%k;aJ
hcRe,}wJ
/* _yR_u+5
* (non-Javadoc) <82&F
* _'1 ]CoR
* @see com.opensymphony.xwork.Action#execute() )*XWe|H_
*/ Vp~ cN
publicString execute()throwsException{ v0! 1W
Result result = userService.listUser(page); p=A,yGDV
page = result.getPage(); M|h B[
users = result.getContent();
~/)]`w
return SUCCESS; .K(9=yh
} 1 n&%L8]
}2e s"
/** }N(gP_?n
* @return Returns the page. CadIux^
*/ AkW>*x
public Page getPage(){ 3RGmmX"?G
return page; ^0cbN[~/ns
} ",vK~m2W_
hgW1g#
/** DUl+Jqn4B
* @return Returns the users. yhbU;qEG9
*/ #\}FQl6
publicList getUsers(){ +swT MR
return users; K$qY^oyQFw
} y9/nkF1p
w|S b`eR
/** ~&RrlF h
* @param page G rU`;M"
* The page to set. I;E?;i
*/ tN\I2wm
publicvoid setPage(Page page){ nh@JGy*L
this.page = page; u*I'c2m
} $H)!h^7^9
%dW;P[0
/** LS9,:!$
* @param users ||wi4TP
* The users to set. f R@Cg
sw
*/ *U$]U0M
publicvoid setUsers(List users){ (.@pe Hu)#
this.users = users; V,Nu!$)J
} 9@ fSO<
#|Lsi`]+
/** M@h"FuX:
* @param userService i \/'w]
* The userService to set. Q
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*/ ak|
VnNa]
publicvoid setUserService(UserService userService){ E' `;
this.userService = userService; fi*b]a\'
} xl,%
Z~[
} L YB@L06a
$"|r7n5[
B&rN