Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 x)<5f|j
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 I\V33Nd
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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 $IUP;
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 :@g@jcbYq`
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分页支持类: Re?sopg0r
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java代码: Y+N^_2@+C
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package com.javaeye.common.util; } {/4sll
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import java.util.List; =0xuH>WY}w
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publicclass PaginationSupport { 9[5NnRv$P
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publicfinalstaticint PAGESIZE = 30; Q(m} Sr4
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privateint pageSize = PAGESIZE; AG)N^yd
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privateList items; /b@0HL?
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privateint totalCount; Jl3l\I'
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privateint[] indexes = newint[0]; L]0+u\(
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privateint startIndex = 0; +AyQ4Q(-o
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public PaginationSupport(List items, int MnFem $ @
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totalCount){ OB3AZH$
setPageSize(PAGESIZE); ><OdHRh@#
setTotalCount(totalCount); z2t;!]"'l
setItems(items); "Gcr1$xG8!
setStartIndex(0); h./cs'&
} ?zUV3Qgzj
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public PaginationSupport(List items, int Fy-nV%P
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totalCount, int startIndex){ x@.iDP@(
setPageSize(PAGESIZE); s9'g'O5
setTotalCount(totalCount); DMcvu*A
setItems(items); xTD6?X'4
setStartIndex(startIndex); O60j C;{F
} IgEg
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public PaginationSupport(List items, int @&+h3dV.V
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totalCount, int pageSize, int startIndex){ 7|zt'.56[
setPageSize(pageSize); P;KbS~ SlC
setTotalCount(totalCount); [OG-ZcNu?
setItems(items); O|,+@qtH
setStartIndex(startIndex); Fhn883
} ?>q=Nf^ Q.
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publicList getItems(){ V]H<:UE
return items; 7x9YA$IE
} &m8B%9w
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publicvoid setItems(List items){ CCq<y
this.items = items; K1O/>dN_\O
} ml=1R>#'
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publicint getPageSize(){ oiO3]P]P
return pageSize; &\sg~
} !QVd'e
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publicvoid setPageSize(int pageSize){ e_]1e7t
this.pageSize = pageSize; o)}b Fw
} 4)2*|w
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publicint getTotalCount(){ Fh v)
return totalCount; {KwLcSn
} cdU2ph_
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publicvoid setTotalCount(int totalCount){ M#S8x@U
if(totalCount > 0){ pI(FUoP^
this.totalCount = totalCount; F]yclXf('
int count = totalCount / r\],5x'xSu
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pageSize; w0/W=!_
if(totalCount % pageSize > 0) 58e{WC
count++; Zy*}C,Z
indexes = newint[count]; f+xGf6V
for(int i = 0; i < count; i++){ e@]cI/j
indexes = pageSize * .e.vh:Sz
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} (!X:[Ah*$
}else{ 8" 8{Nf-"
this.totalCount = 0; qwFn(pK[
} vo71T<K
} fil6w</L
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publicint[] getIndexes(){ <S$y=>.9
return indexes; Ur&: Rr
} aqzvT5*8%
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publicvoid setIndexes(int[] indexes){ HqYaQ~Dth
this.indexes = indexes; ;o^m"I\y
} 1}ZBj%z4l
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publicint getStartIndex(){ dJ24J+9}]j
return startIndex; LiV]!*9$KG
} <Isr
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publicvoid setStartIndex(int startIndex){ H50nR$$<*Y
if(totalCount <= 0) K=(&iq!VO
this.startIndex = 0; } |SVt`n
elseif(startIndex >= totalCount) N,[M8n,
this.startIndex = indexes ?J6hiQvL
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[indexes.length - 1]; sL/Lw
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elseif(startIndex < 0) \17)=W
this.startIndex = 0; n.1a1 Tf
else{ P{>T?-Hj
this.startIndex = indexes ?q,x?`|(8
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[startIndex / pageSize]; 0e7v ?UT
} q0c)pxD%`
} i;dr(c/ft
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publicint getNextIndex(){ MPL2#YU/a
int nextIndex = getStartIndex() + YYM
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pageSize; ;N1FP*
if(nextIndex >= totalCount) k2+Z7#2n
return getStartIndex(); y4?>5{`W
else R,^FJ
return nextIndex; ,*lK4?v
} RgRcW5VxK
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publicint getPreviousIndex(){ z.H`a+cl
int previousIndex = getStartIndex() -
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pageSize; s[s^z<4G
if(previousIndex < 0) 9n%W-R.
return0; ljf9L:L
else EhVnt#`Si
return previousIndex; r}5GJ|p0
} 1Gqtd^*;
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} /KV@Ce\
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抽象业务类 0y ;gi3W
java代码: c`jTdVD
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/** 9,>M/_8>
* Created on 2005-7-12 #M>E{w9
*/ -OW$
package com.javaeye.common.business; ~,guw7F
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import java.io.Serializable; ~g,QwaA[
import java.util.List; _j2`#|oG
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import org.hibernate.Criteria; %FRkvqV*
import org.hibernate.HibernateException; dW5z0VuB$/
import org.hibernate.Session; ~G$OY9UC
import org.hibernate.criterion.DetachedCriteria; "l@~WE
import org.hibernate.criterion.Projections; "bO]
import vaU7tJ:
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org.springframework.orm.hibernate3.HibernateCallback; 6x7=0}'
import D"WkD j"M
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org.springframework.orm.hibernate3.support.HibernateDaoS {38aaf|'/
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upport; qqAsh]Z
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import com.javaeye.common.util.PaginationSupport; GkO6r'MVE
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public abstract class AbstractManager extends BA5= D>T-
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HibernateDaoSupport { Xg)yz~Ug
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privateboolean cacheQueries = false; +Q9HsfX/
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privateString queryCacheRegion; [/kO>
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publicvoid setCacheQueries(boolean 7/yd@#$X
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cacheQueries){ iUKj:q:
this.cacheQueries = cacheQueries; YsDl2P
} {!S/8o"]
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publicvoid setQueryCacheRegion(String M#p,Z F
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queryCacheRegion){ yUG5'<lX
this.queryCacheRegion = :tgTYIF
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queryCacheRegion; W7
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} z~_\onC
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publicvoid save(finalObject entity){ Rju8%FRO
getHibernateTemplate().save(entity); +OmSR*fA0
} ig,|3(
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publicvoid persist(finalObject entity){ g=(+oK?
getHibernateTemplate().save(entity); `iI"rlc
} buFtLPe
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publicvoid update(finalObject entity){ n\YxRs7
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getHibernateTemplate().update(entity); `3KprpE8v
} r?TK@^z
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publicvoid delete(finalObject entity){ {Vm36/a
getHibernateTemplate().delete(entity); i<?4iwX%i*
} 6.jZy~
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publicObject load(finalClass entity, Z^l!y5s/H
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finalSerializable id){ 1`t?5|s>
return getHibernateTemplate().load NZuFxJ-`
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(entity, id); Y Pc<
} {;E/l(HNI
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publicObject get(finalClass entity, ss<'g@R
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finalSerializable id){ ni>
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return getHibernateTemplate().get NjxW A&[ng
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(entity, id); g@k9w{_
} 4:'] 'E
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publicList findAll(finalClass entity){ \7/_+)0}'
return getHibernateTemplate().find("from G= cxc_9
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" + entity.getName()); 8957$g
} mmL~`i/
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publicList findByNamedQuery(finalString <^Tj}5)n
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namedQuery){ zf~zYZSr
return getHibernateTemplate 7
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().findByNamedQuery(namedQuery); W<VHv"?V
} BT3O_X`u
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publicList findByNamedQuery(finalString query, (Y)h+}n5N
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finalObject parameter){ ;l ()3;
return getHibernateTemplate oDUMoX%4s
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().findByNamedQuery(query, parameter); [{F7Pc
} !@{[I:5
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publicList findByNamedQuery(finalString query, ]gksyxn3
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finalObject[] parameters){ C4tl4df9
return getHibernateTemplate dA/o4co
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().findByNamedQuery(query, parameters); =7fh1XnW
} "ru1 ;I
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publicList find(finalString query){ %}XMhWn{
return getHibernateTemplate().find !^fR8Tp9
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(query); ; ZV^e
} 5R `6zhf
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publicList find(finalString query, finalObject ;/ KF3
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parameter){ K)&XQ`&
return getHibernateTemplate().find 8$U ZL
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(query, parameter); 2bnIT>(
} 9Fx z!-9m
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public PaginationSupport findPageByCriteria /kU@S
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(final DetachedCriteria detachedCriteria){ -_DiD^UcXn
return findPageByCriteria Os 2YZ<t
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ',`4 U F
} J 7;n;Mx
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public PaginationSupport findPageByCriteria hX| UE
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(final DetachedCriteria detachedCriteria, finalint o!r4 frP
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startIndex){ OCO,-(
return findPageByCriteria ' 5 qL
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(detachedCriteria, PaginationSupport.PAGESIZE, \w[ZY$/
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startIndex); X1[R*a/p
} JS?l?~
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public PaginationSupport findPageByCriteria OXX(OCG>
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(final DetachedCriteria detachedCriteria, finalint GdeR#%z
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pageSize, A|_%'8
finalint startIndex){ [I<'E
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return(PaginationSupport) MQH8Q$5D
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getHibernateTemplate().execute(new HibernateCallback(){ *Gh8nQbh
publicObject doInHibernate ajW$d!
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(Session session)throws HibernateException { t>GLZzO
Criteria criteria = 'a/6]%QFd!
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detachedCriteria.getExecutableCriteria(session); D3AtYt
int totalCount = < Gy!i/
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((Integer) criteria.setProjection(Projections.rowCount DD6`k*RIk.
us,,W(q
()).uniqueResult()).intValue(); 9
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criteria.setProjection j X!ftm2
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(null); hPi
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List items = 0R 5^p
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criteria.setFirstResult(startIndex).setMaxResults -kri3?Y,
l)PFzIz=V
(pageSize).list(); vua1iN1
PaginationSupport ps = aco}pXz
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new PaginationSupport(items, totalCount, pageSize, <_{4-Q>S3#
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startIndex); RQ)!KlY
return ps; IfmIX+t?
} 9Bvn>+_K
}, true); C`~4q<W'
} F;&fx(
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public List findAllByCriteria(final (T#(A4:6S
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;
DetachedCriteria detachedCriteria){ m57tOX
return(List) getHibernateTemplate S}p&\w H
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().execute(new HibernateCallback(){ IJBJebqL
publicObject doInHibernate p<0kmA<B/
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(Session session)throws HibernateException { . I&)MZ>n
Criteria criteria = &~JfDe9IS
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detachedCriteria.getExecutableCriteria(session); VRQbf
return criteria.list(); B/9<b{6
} IU'!?XVo
}, true); N"
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} MHr0CYyb.
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public int getCountByCriteria(final Vh.;p.!e
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DetachedCriteria detachedCriteria){ ;GgQ@s@
Integer count = (Integer) 2*FWIHyf
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getHibernateTemplate().execute(new HibernateCallback(){ ~SR(K{nf#.
publicObject doInHibernate K0DXOVT\
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(Session session)throws HibernateException { hzuMTKH9
Criteria criteria = ND55`KT4
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detachedCriteria.getExecutableCriteria(session); lfpt:5a9&
return p`<e~[]a
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criteria.setProjection(Projections.rowCount Ibv_D$cT
At[n<8_|
()).uniqueResult(); mp+\!
} ?Str*XA;
}, true); M\?uDC9
return count.intValue(); ~q]|pD"\K|
} 3e!Yu.q:
} &DbGyV8d"|
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用户在web层构造查询条件detachedCriteria,和可选的 !8" $d_=h
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 #-gGsj;F
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PaginationSupport的实例ps。 {7Gx9(
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ps.getItems()得到已分页好的结果集 d[>N6?JA/
ps.getIndexes()得到分页索引的数组 +zVcOS*-
ps.getTotalCount()得到总结果数 sQ>B_Y!
ps.getStartIndex()当前分页索引 b!^M}s6
ps.getNextIndex()下一页索引 RZ<+AX9R
ps.getPreviousIndex()上一页索引 %+7T9>+
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 1 ~B<
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 FUzMc1zy|
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一下代码重构了。 ?LV-W
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我把原本我的做法也提供出来供大家讨论吧: 0x>/ 6 <<
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首先,为了实现分页查询,我封装了一个Page类: G1?0Q_RN
java代码: VT5cxB<
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/*Created on 2005-4-14*/ ni"$[8U
package org.flyware.util.page; tkdBlG]!
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/** 4(Cd
* @author Joa B
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* Hn#GS9d_?
*/ "J8;4p
publicclass Page { ;Txv-lfS
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/** imply if the page has previous page */ D 8@nkSP
privateboolean hasPrePage; x:A-p..e
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/** imply if the page has next page */ )DGz`->
privateboolean hasNextPage; k"q!|+&Fs
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/** the number of every page */ .0Iun+nUD
privateint everyPage; jsNH`"
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/** the total page number */ 9k=U0]!ch
privateint totalPage; 7g A08M[O
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/** the number of current page */ kb"_6,[Ms
privateint currentPage; xb+RRTgj
qLQ <1>u
/** the begin index of the records by the current kvW|=
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query */ cQ3W;F8|n
privateint beginIndex; 0|fb< "
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/** The default constructor */ T}L^CU0
public Page(){ Ci7P%]9
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} "EcX_>
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/** construct the page by everyPage ~Ho{p Oq
* @param everyPage X$7Oo^1;
* */ h&=O-5
public Page(int everyPage){ GSMk\9SI
this.everyPage = everyPage; P+)qE6\
} &=F-moDD
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/** The whole constructor */ aN^]bs?R
public Page(boolean hasPrePage, boolean hasNextPage, 3I9T|wQ-]
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int everyPage, int totalPage, F_A%8)N
int currentPage, int beginIndex){ h4hN1<ky\
this.hasPrePage = hasPrePage; a|DsHZ^6^
this.hasNextPage = hasNextPage; Q^z=w![z
this.everyPage = everyPage; mR{CVU
this.totalPage = totalPage; Y7<zm}=(/
this.currentPage = currentPage; Vq3gceo'0A
this.beginIndex = beginIndex; o&(wg(Rv
} E,{GU
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/** z%(Fo2)^
* @return &49u5&TiP
* Returns the beginIndex. :83,[;GO2
*/ FJP< bREQ
publicint getBeginIndex(){ ^4c,U9J=
return beginIndex; 0U$:>bQ
} e^j<jV`1
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/** 4p.^'2m
* @param beginIndex PG{i,xq_B{
* The beginIndex to set. ?b||Cr
*/ =43I1&_
publicvoid setBeginIndex(int beginIndex){ 0cHfxy3
this.beginIndex = beginIndex; K&=D-50%
} PJzc=XPU
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/** AY#wVy
* @return t)YUPDQ@J
* Returns the currentPage. <fN;
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*/ *)u?~r(F
publicint getCurrentPage(){ 5L8&/EN9-
return currentPage; ^:`oP"%-T
} ~12_D'8D[
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/** S]}}A
* @param currentPage n.*3,4.]
* The currentPage to set. 9B
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*/ {P-xCmZ~Wt
publicvoid setCurrentPage(int currentPage){ GL1'Zo
this.currentPage = currentPage; JPEIT
} 3KSpB;HX
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/** ;HDZ+B
* @return S}[l*7
* Returns the everyPage. 3y99O
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*/ KU-'+k2s;p
publicint getEveryPage(){ 11@]d]v ,
return everyPage; Q]@c&* _|
} <3 A0={En
8".2)W4*
/** LheFQ A
* @param everyPage $.pTB(tO
* The everyPage to set. o\Uu?.-<
*/ I,b9t\(6
publicvoid setEveryPage(int everyPage){ 6B0#4Qrv
this.everyPage = everyPage; Ga v"C{G
} H$!+A
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/** qj&bo
* @return owvS/"@
* Returns the hasNextPage. fAGctRGH
*/ `H\)e%]
publicboolean getHasNextPage(){ Y;Ap9i*
return hasNextPage; 8nCp\0
} OOnX`
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/** Ve}[XqdS^p
* @param hasNextPage gxwo4.,
* The hasNextPage to set. ,M QVE
*/ q/NY72tj0
publicvoid setHasNextPage(boolean hasNextPage){ #EDEYEW7
this.hasNextPage = hasNextPage; 9Hd;353Q
} !;S"&mcPDJ
.[?BlIlm
/** R_^/,^1
* @return qz!Ph5(
* Returns the hasPrePage. ]dSK
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*/ p~&BChBl!=
publicboolean getHasPrePage(){ SR ZL\m}
return hasPrePage; 5u r)uz]w8
} UZGDdP
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/** 5{d\uE%'p
* @param hasPrePage %d1draL
* The hasPrePage to set. |t))u`~
*/ }u%"$[I}
publicvoid setHasPrePage(boolean hasPrePage){ y500Xs[c
this.hasPrePage = hasPrePage; ib$nc2BPb
} T-gk <V
g JjN<&,
/** } XR:2
* @return Returns the totalPage. .m;G$X|3U
* pXu/(&?
*/ 2#vv$YD
publicint getTotalPage(){ =wG+Ao
return totalPage; Zp&@h-%YoD
} 9XLFHV("
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/** /*$hx @ih
* @param totalPage #]E(N~
* The totalPage to set. ujr(K=E
*/ Y
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publicvoid setTotalPage(int totalPage){ A(8n
this.totalPage = totalPage; S QY"OBo<e
} t
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EH n"n"Y
} I7n3xN&4"
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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 "Pz}@=
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个PageUtil,负责对Page对象进行构造: ;
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java代码: /KCPpERk{
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/*Created on 2005-4-14*/ `_vB+a
package org.flyware.util.page; V0*3;n
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import org.apache.commons.logging.Log; _Ov;4nt!
import org.apache.commons.logging.LogFactory; 445o DkG
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/** ?4 S+edX
* @author Joa Zg~nlO2
* p|+B3
*/ .8WXC
publicclass PageUtil { l;A,0,i
p\p\q(S">
privatestaticfinal Log logger = LogFactory.getLog l?8M
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(PageUtil.class); 1ocJ+
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/** B,WTHU[AV
* Use the origin page to create a new page BvD5SBa}"
* @param page tV;`fV
* @param totalRecords Y&HK