Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 t;3n
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 /~8<;N>,+
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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 {6y@;Fd
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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 T%[&[8{8
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分页支持类: \zdY$3z
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java代码: k=nN#SMn
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package com.javaeye.common.util; =7e|e6
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import java.util.List; 0P+B-K>n
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publicclass PaginationSupport { ms(Z1ix^
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publicfinalstaticint PAGESIZE = 30; `wMHjcUP
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privateint pageSize = PAGESIZE; !1X^lFf;~
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privateList items; fwN'5ep
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privateint totalCount; sy\w ^]
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privateint[] indexes = newint[0]; Yn~N;VUA
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privateint startIndex = 0; ,GU|3
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public PaginationSupport(List items, int SU`RHAo
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totalCount){ P3W<a4 ==
setPageSize(PAGESIZE); #W]4aZ1
setTotalCount(totalCount); YKWiZ
setItems(items); mY'c<>6t
setStartIndex(0); W1$<,4j@M
} q^I/
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public PaginationSupport(List items, int #s}cK
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totalCount, int startIndex){
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setPageSize(PAGESIZE); _Yms]QEZ
setTotalCount(totalCount); 2~wIHtd
setItems(items); y8!#G-d5
setStartIndex(startIndex); +HpPVuV
} $;V?xZm[
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public PaginationSupport(List items, int C&1()U
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totalCount, int pageSize, int startIndex){ \-h%z%{R
setPageSize(pageSize); 'f
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setTotalCount(totalCount); C||9u}Q<
setItems(items); m4r!Ck|
setStartIndex(startIndex); zZhA]J
} :|5\XV)>
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publicList getItems(){ J?1U'/Wx2
return items; - Mubq
} BPwn!ii|
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publicvoid setItems(List items){ h;lg^zlTb
this.items = items; kgl7l?|O
} 5L!cS+QNU
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publicint getPageSize(){ pVa9g)+z}
return pageSize; d OYEl<!J
}
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publicvoid setPageSize(int pageSize){ fp)%Cr
this.pageSize = pageSize; M#CYDEB
} ER'zjI>t@
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publicint getTotalCount(){ \8}!aTC
return totalCount; \Aa{]t
} |3:e$
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publicvoid setTotalCount(int totalCount){
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if(totalCount > 0){ g)M"Cx.
this.totalCount = totalCount; U%?
int count = totalCount / 6 *GR_sMm
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pageSize; iKVJ
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if(totalCount % pageSize > 0) v*[oe
count++; !^FR a{b
indexes = newint[count]; _ mJP=+i
for(int i = 0; i < count; i++){ [/+}E X
indexes = pageSize * mFa%d8Y
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} [(kC/W)!
}else{ 9ZVzIv(
this.totalCount = 0;
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} %={[e`,
} DKnlbl1^?
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publicint[] getIndexes(){ eJ"je@vvrK
return indexes; AS-%I+ A
} rFLm!J]
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publicvoid setIndexes(int[] indexes){ Wq"5-U;:w
this.indexes = indexes; B ?%g@d-;
} 7E]qP
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publicint getStartIndex(){ +v{g'
return startIndex; WV?3DzeR
} ^NB\[ &
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publicvoid setStartIndex(int startIndex){ SF.Is=b
if(totalCount <= 0) h( V:-D
this.startIndex = 0; N/V~>UJ0{*
elseif(startIndex >= totalCount) 'L5ih|$>
this.startIndex = indexes Gzw9E.Hk
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[indexes.length - 1]; sogdM{tz\
elseif(startIndex < 0) VNT*@^O_=
this.startIndex = 0; 7)zF8V
else{ QJ^'Uyfdn
this.startIndex = indexes {"vTaY@
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[startIndex / pageSize]; De^Uc
} $GJuS^@%
} 'wT !X[jF
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publicint getNextIndex(){ ,~nrNkhp
int nextIndex = getStartIndex() + Yj{-|2YzL
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pageSize; I(Gl8F\c~
if(nextIndex >= totalCount) rInZd`\
return getStartIndex(); ~Iz{@Ep*
else A?+cdbxJw
return nextIndex; 0U&@;/?
} bB+ 4
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publicint getPreviousIndex(){ VXP@)\!
int previousIndex = getStartIndex() - i}=n6
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pageSize; y{g"w
if(previousIndex < 0) YwU[kr-i
return0; S>;+zVF]
else xtFGj,N
return previousIndex; H#:Aby-d}
} ^|UD&6 dx
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} t->I# t7
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抽象业务类 _~.S~;o!b
java代码: 0Z1';A3
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/** 3,^.
* Created on 2005-7-12 $nqVE{ksV
*/ -LU%z'
package com.javaeye.common.business; BF/l#)$yK
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import java.io.Serializable; \\P*w$c
import java.util.List; ;iO5
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import org.hibernate.Criteria; U(:Di]>{
import org.hibernate.HibernateException; i9eE/
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import org.hibernate.Session; p8(Z{TSv
import org.hibernate.criterion.DetachedCriteria; vw6DHN)k
import org.hibernate.criterion.Projections; KD`*[.tT
import ;5tQV%V^Q
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org.springframework.orm.hibernate3.HibernateCallback; fL~@v-l#~
import 5pH6] $
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org.springframework.orm.hibernate3.support.HibernateDaoS SNc $!
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upport; Jd28/X5&
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import com.javaeye.common.util.PaginationSupport; zALtG<_t
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public abstract class AbstractManager extends QxT\_Nej*n
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HibernateDaoSupport { tt A'RJ
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privateboolean cacheQueries = false; 'fPDODE
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privateString queryCacheRegion; e.WKf,e"X
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publicvoid setCacheQueries(boolean {gb` %J
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cacheQueries){ R$bDj>8
this.cacheQueries = cacheQueries; O>d
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} <>H^:iqn
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publicvoid setQueryCacheRegion(String yof8L WXx
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queryCacheRegion){ "V`5 $ur
this.queryCacheRegion = M9~6ry-_
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queryCacheRegion; :,V&P_
} EMzJyGt7
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publicvoid save(finalObject entity){ RZ|M;c
getHibernateTemplate().save(entity); 5zz">-Q !
} ! ~tf0aY
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publicvoid persist(finalObject entity){ ]CDUHz
getHibernateTemplate().save(entity); R>B6@|}?
} +F*h\4ry#
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publicvoid update(finalObject entity){ }#S1!TU
getHibernateTemplate().update(entity); x@3cZd0j#
} g(i8HU*{q
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publicvoid delete(finalObject entity){ .DM-&P
getHibernateTemplate().delete(entity); g3
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} l{*Ko~g
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publicObject load(finalClass entity, &+3RsIlW
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finalSerializable id){ biV NZdA
return getHibernateTemplate().load 7CH.BY
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(entity, id); v3{%U1>}v
} V9jxmu F,
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publicObject get(finalClass entity, x_CY`Y
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finalSerializable id){ iH~A7e62OZ
return getHibernateTemplate().get qWf[X'
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(entity, id); q[9N4nj$<
} eL.WP`Lz
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publicList findAll(finalClass entity){ d2TIG<6/
return getHibernateTemplate().find("from @v3)N[|d
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" + entity.getName()); PpH
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} !2>@:CKX
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publicList findByNamedQuery(finalString I1rB,%p
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namedQuery){ ,Xr`tQ<@
return getHibernateTemplate yz,0
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().findByNamedQuery(namedQuery); 6}VFob#h8
} bYZU}Kl;(
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publicList findByNamedQuery(finalString query, X8ZO
} X
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finalObject parameter){ ec/>LJDX7
return getHibernateTemplate R$66F>Jz^
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().findByNamedQuery(query, parameter); D_1O4/
} bub6{MQW8e
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publicList findByNamedQuery(finalString query, O&&_)
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finalObject[] parameters){ z&Aya*0v`
return getHibernateTemplate 2i;ox*SfpU
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().findByNamedQuery(query, parameters); |i#06jIq
} rV4K@)~
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publicList find(finalString query){ Lis>Qr
return getHibernateTemplate().find F_m'
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(query); ,,+4d :8$
} VIN0kRQ#
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publicList find(finalString query, finalObject Jp%5qBS^
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parameter){ K#AexA
return getHibernateTemplate().find gu%i|-}
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(query, parameter); , ,ng]&%i
} i;s;:{cn
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public PaginationSupport findPageByCriteria
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(final DetachedCriteria detachedCriteria){ &"I csxG
return findPageByCriteria +4Pes
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); PgGUs4[
} XZM@Rys
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public PaginationSupport findPageByCriteria l'aCpzf
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(final DetachedCriteria detachedCriteria, finalint m4m|?
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startIndex){ k4hk*
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return findPageByCriteria ;b~\[
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(detachedCriteria, PaginationSupport.PAGESIZE, a!-J=\>9
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startIndex); >:> W=
} RLMn&j|?e
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public PaginationSupport findPageByCriteria ..+#~3es#y
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(final DetachedCriteria detachedCriteria, finalint u:2Ll[ eo
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pageSize, u4w!SD
finalint startIndex){ M<n'ZDK`W
return(PaginationSupport) H?8'(
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getHibernateTemplate().execute(new HibernateCallback(){ f$:SacF
publicObject doInHibernate ?6&8-zt1?
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(Session session)throws HibernateException { 4C%pKV
Criteria criteria = 3B
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detachedCriteria.getExecutableCriteria(session); ^Y%_{
int totalCount = y32$b,%Xi,
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((Integer) criteria.setProjection(Projections.rowCount vno/V#e$WX
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()).uniqueResult()).intValue(); 2~?E'
criteria.setProjection ""a$[[ %WC
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(null); PC<_1!M]
List items = bIyg7X)/
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criteria.setFirstResult(startIndex).setMaxResults B6k<#-HAT
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(pageSize).list(); h )5S4)
PaginationSupport ps = QO(F%&v++
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new PaginationSupport(items, totalCount, pageSize, |oXd4
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startIndex); )j>U4a
return ps; -LszaMR}
} 8Ejb/W_
}, true); p ZTrh&I]
} ~Q]5g7k=&
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public List findAllByCriteria(final 0~^RHb.NA8
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DetachedCriteria detachedCriteria){ mL48L57Z
return(List) getHibernateTemplate zZ8 *a\
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().execute(new HibernateCallback(){ 4A!]kj5T
publicObject doInHibernate -m%`Di!E
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(Session session)throws HibernateException { F9u?+y-xb
Criteria criteria = J4"Fj, FS
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detachedCriteria.getExecutableCriteria(session); KddCR&
return criteria.list(); =zcvR {Dkp
} =,#--1R7g
}, true); kygw}|, N
} JUpV(p"-r
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public int getCountByCriteria(final Zob/H+]
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DetachedCriteria detachedCriteria){ Wjw,LwB
Integer count = (Integer) jRS{7rx%MH
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getHibernateTemplate().execute(new HibernateCallback(){ !ka* rd
publicObject doInHibernate ,
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(Session session)throws HibernateException { MxIa,M<
Criteria criteria = akzGJ3g
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detachedCriteria.getExecutableCriteria(session); nTEN&8Y>R
return ro{!X, _$,
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criteria.setProjection(Projections.rowCount j )6
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()).uniqueResult(); ,|({[9jA
} |h\7Q1,1~2
}, true); +nDy b
return count.intValue(); g4[VgmhJ
} pa[/6(
} ,RV
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/*mF:40M;
用户在web层构造查询条件detachedCriteria,和可选的 "La;$7ds
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 !qt2,V
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PaginationSupport的实例ps。 2X?GEO]/4
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ps.getItems()得到已分页好的结果集 mLX/xM/T?/
ps.getIndexes()得到分页索引的数组 0@
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ps.getTotalCount()得到总结果数 `@/)S^jBau
ps.getStartIndex()当前分页索引 %c }V/v_h
ps.getNextIndex()下一页索引 tJ\
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ps.getPreviousIndex()上一页索引 +WH\,E
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 BzzC|
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 *NmY]
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一下代码重构了。 qs5>`skX
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我把原本我的做法也提供出来供大家讨论吧: va6Fp2n<1*
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首先,为了实现分页查询,我封装了一个Page类:
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java代码: ;CYoc4e
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/*Created on 2005-4-14*/ KGz Nj%
package org.flyware.util.page; j/ 5
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/** AUnfhk@$
* @author Joa (Xd8'-G$m
* Eb8pM>'qM
*/ nf.Ox.kM)
publicclass Page { O=B=0
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/** imply if the page has previous page */ Bn}woyJdx
privateboolean hasPrePage; d54iZ`
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/** imply if the page has next page */ 4&iQo'
privateboolean hasNextPage; |7qt/z
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/** the number of every page */ <!OBpAq
privateint everyPage; c4Ebre-Oa
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/** the total page number */ l2D*b93
privateint totalPage; L5&M@YTH
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/** the number of current page */ mUYRioNj
privateint currentPage; l/.{F ;3F
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/** the begin index of the records by the current 02;jeZ#z
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query */ Pvxb6\G&d
privateint beginIndex; ['d9sEv .
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/** The default constructor */ ~k"+5bHa*
public Page(){ TEtmmp0OD
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} "Ep"$d
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/** construct the page by everyPage "+HJ/8Dd1
* @param everyPage e4z`:%vy
* */ AO#9XDEM
public Page(int everyPage){ bi<<z-q`wJ
this.everyPage = everyPage; b8mH.g&l
} fvu{(Tb
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/** The whole constructor */ Gm~([Ln{
public Page(boolean hasPrePage, boolean hasNextPage, M0V<Ay\%O
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int everyPage, int totalPage, m1$tf
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int currentPage, int beginIndex){ Myq8`/_
this.hasPrePage = hasPrePage; Oa|c ?|+
this.hasNextPage = hasNextPage; s9- qR_
this.everyPage = everyPage; 1IXtu
this.totalPage = totalPage; 'eM0i[E+`
this.currentPage = currentPage; ?qh-#,O9B
this.beginIndex = beginIndex; fBS a8D3}`
} ,i>`Urd
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/** q lc@$
* @return Knwy%5.Z
* Returns the beginIndex. 8$( I! ;
*/ DiFLat]X
publicint getBeginIndex(){ I G1];vX
return beginIndex; =LW!$p
} 2 bc&sU)X
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/** K_i|cYGV
* @param beginIndex %>Kba M1b
* The beginIndex to set. \&"C
*/ 1@]&iZ]
publicvoid setBeginIndex(int beginIndex){ : auR0FE
this.beginIndex = beginIndex; L2H
} w~Tg?RH:
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/** zdN[Uc+1Bd
* @return %>+uEjbT
* Returns the currentPage. o'2eSm0H
*/ :So<N}&
publicint getCurrentPage(){ W+h2 rv
return currentPage; p-4$)w~6i
} c^}y9% 4c
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/** BJ|l
* @param currentPage .}IW!$
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* The currentPage to set. ,#Z%0NLe
*/ +B*]RL[th
publicvoid setCurrentPage(int currentPage){ $/wm k7T
this.currentPage = currentPage; @*z"Hi>4
} X^\D"fmE.
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/** !"^Zr]Qt+\
* @return ^exU]5nvz
* Returns the everyPage. jTa\I&s