Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 )^2eC<t
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 &w@]\7L,:
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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 v2T2/y%
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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 FpoHm%+
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。 LPk@t^[
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分页支持类: z>x@o}#u\|
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java代码: ]9@:7d6
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package com.javaeye.common.util; ^X#y'odtbS
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import java.util.List; -<iP$,bq72
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publicclass PaginationSupport { 6j#JhcS+
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publicfinalstaticint PAGESIZE = 30; Ni$'#
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privateint pageSize = PAGESIZE; fFQ|dE;cF
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privateList items; N&9o 1_}
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privateint totalCount; !avol/*
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privateint[] indexes = newint[0]; }gp@0ri%5
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privateint startIndex = 0; [&x9<f6
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public PaginationSupport(List items, int AGBV7Kk
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totalCount){ %mI0*YRma
setPageSize(PAGESIZE); 'yo@5*x7
setTotalCount(totalCount); FX:`7c]:9
setItems(items); [KDxB>R<{
setStartIndex(0); `e[S Zj\
} "*g+qll!5d
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public PaginationSupport(List items, int AtT7~cVe
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totalCount, int startIndex){ Qg> NJ\*Q
setPageSize(PAGESIZE); rd <m:r
setTotalCount(totalCount); w5FIHYl6B
setItems(items); I-#H+\S
setStartIndex(startIndex); %?~'A59
} &@=Jm
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public PaginationSupport(List items, int \#sD`O
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totalCount, int pageSize, int startIndex){ F^!D[:;jK
setPageSize(pageSize); 3m1g"
setTotalCount(totalCount); JWVV?~1
setItems(items); JK,MK|
setStartIndex(startIndex);
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} V&Y`?Edc
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publicList getItems(){ 8|&,JdT
return items; -4Qub{Uym
} -V$|t<
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publicvoid setItems(List items){ C{)1#<`
this.items = items; C6+ 5G-Z
} O\}C`CiC
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publicint getPageSize(){ {v={q1
return pageSize; _H] \
} @T1G#[C~t
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publicvoid setPageSize(int pageSize){ HU0.)tD
this.pageSize = pageSize; #G9
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} sz7*x{E
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publicint getTotalCount(){ %VHy?!/
return totalCount; (leX` SN0u
} @N'n>8Wn
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publicvoid setTotalCount(int totalCount){ z8=THz2f
if(totalCount > 0){ vu0Ql1
this.totalCount = totalCount; zLJ>)v$81
int count = totalCount /
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pageSize; pwSgFc$z
if(totalCount % pageSize > 0) iUkUo x
count++; `IHP_IfR
indexes = newint[count]; Ou[K7-m%&
for(int i = 0; i < count; i++){ p.8 bX
indexes = pageSize * 79DNNj~
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i; n,T
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} VFE@qX|
}else{ |3$Ew.
this.totalCount = 0; _kKG%U.gbK
} Y;w|Fvjj+
} 44CZl{pt
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publicint[] getIndexes(){ jaS<*_~#R
return indexes; ammi4k/
} fe .=Z&
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publicvoid setIndexes(int[] indexes){ '1u?-2
this.indexes = indexes; i?L=8+9f
} ,%!m%+K9a
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publicint getStartIndex(){ UiU/p
return startIndex; C T~6T&'
} (g6e5Sgi>
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publicvoid setStartIndex(int startIndex){ 5:PS74/
if(totalCount <= 0) ?XKX&ws
this.startIndex = 0; O:BdZ5
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elseif(startIndex >= totalCount) qI'pjTMDY
this.startIndex = indexes (Jp~=6&lKf
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[indexes.length - 1]; b'4a;k!rS
elseif(startIndex < 0) .zb
this.startIndex = 0; \g0vzo"u
else{ 7i5B=y7b
this.startIndex = indexes e;i 6C%DB
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[startIndex / pageSize]; &M-vKc"d
} &5
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} wv~:^v'
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publicint getNextIndex(){ c[2t,+O
int nextIndex = getStartIndex() + @9^OHRZX
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pageSize; $f@YQN=
if(nextIndex >= totalCount) zw#n85=
return getStartIndex(); coCT]<
else nbxY'`8F
return nextIndex; jCY~Wc
} MkW=sD_
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publicint getPreviousIndex(){ e5mu-
int previousIndex = getStartIndex() - <^s31.&p
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pageSize; Zk`y"[ J
if(previousIndex < 0) $ :I{
return0; eEXNEgbn
else cB&_':F
return previousIndex; -9vNV:c
} B/X$ZQ0
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} 97Dq;
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抽象业务类 YCRE- 5!
java代码: y`9#zYgqA
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/** ]9_gbQ
* Created on 2005-7-12 eipg,EI
*/ +-tFg XG
package com.javaeye.common.business; pW+uVv,
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import java.io.Serializable; { <Gyjq
import java.util.List; ;PaU"z+Je~
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import org.hibernate.Criteria; rp\`uj*D
import org.hibernate.HibernateException; 1v&!%9
import org.hibernate.Session; !4Aj#`)
import org.hibernate.criterion.DetachedCriteria; 7R:j^"I@
import org.hibernate.criterion.Projections; ezw*Lo!
import LqYyIbsvf
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org.springframework.orm.hibernate3.HibernateCallback; S ,F[74K
import fTXip)n!r
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org.springframework.orm.hibernate3.support.HibernateDaoS @Ommd{0M
# fqrZ9:@
upport; TG;[,oa
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import com.javaeye.common.util.PaginationSupport; J2}poNmm
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public abstract class AbstractManager extends U!uPf:p2
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HibernateDaoSupport { (F^R9G|
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privateboolean cacheQueries = false; %GTFub0F
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privateString queryCacheRegion; a/uo)']B
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publicvoid setCacheQueries(boolean 'IY?=#xr'`
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cacheQueries){ (zFqb,P
this.cacheQueries = cacheQueries; Mf14> `<`
} wU|@fm"
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publicvoid setQueryCacheRegion(String A|LO!P,w
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queryCacheRegion){ O?g;Ny
this.queryCacheRegion = @%fTdneH
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queryCacheRegion; .K84"Gdx
} lrZ]c:%k
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publicvoid save(finalObject entity){ S?CT6moXA
getHibernateTemplate().save(entity); )!v"(i.5Xo
} \dJhDR
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publicvoid persist(finalObject entity){ `(HvD] l
getHibernateTemplate().save(entity); `Pc6
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} :pM8Q1:B
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publicvoid update(finalObject entity){ HnArj_E
getHibernateTemplate().update(entity); \(Oc3+n6
} 7f+@6jqD\)
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publicvoid delete(finalObject entity){ I#xdksY
getHibernateTemplate().delete(entity); y?a71b8m
} tx7 zG.,
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publicObject load(finalClass entity, $ (;:4
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finalSerializable id){ !#pc@(rE
return getHibernateTemplate().load ef^GJTv&k
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(entity, id); ~bkO8tn
} k6M D3c
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publicObject get(finalClass entity, lIS`_H}
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finalSerializable id){ nHm29{G0
return getHibernateTemplate().get l6#Y}<tq
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(entity, id); 7)QZ<fme
} Xuu&`U~%
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publicList findAll(finalClass entity){ W6T4Zsg
return getHibernateTemplate().find("from [3bPoAr\
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" + entity.getName()); 2`*w*
} iO?AY
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publicList findByNamedQuery(finalString {!D(3~MI
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namedQuery){ _|US`,kfc
return getHibernateTemplate 5H.~pc2y
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().findByNamedQuery(namedQuery); %IBT85{
} _U&HXQ8X
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publicList findByNamedQuery(finalString query, ["f6Ern
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finalObject parameter){ =V|jd'iwx
return getHibernateTemplate <&Xl b0
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().findByNamedQuery(query, parameter); l,hOnpm9
} U2m#BMV
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publicList findByNamedQuery(finalString query, N$kxf
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finalObject[] parameters){ 7:olStK
return getHibernateTemplate =S{OzF
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().findByNamedQuery(query, parameters); SI~jM:S}
} jbipNgxkr
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publicList find(finalString query){ cy.r/Z}
return getHibernateTemplate().find ~D3S01ecM
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(query); )KE
} &*>.u8:r
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publicList find(finalString query, finalObject h"+7cc@
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parameter){ dscah0T
return getHibernateTemplate().find H2BRId
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(query, parameter); )XN%pn
} -B#1+rUW
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public PaginationSupport findPageByCriteria WF`%7A39Af
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(final DetachedCriteria detachedCriteria){ zQulPU
return findPageByCriteria >fWGiFmlk
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 9{OO'at?
} 6Yn>9llo}=
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public PaginationSupport findPageByCriteria 2pdeJ
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(final DetachedCriteria detachedCriteria, finalint I;NW!"pU
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startIndex){ c+3`hVV
return findPageByCriteria QO}~"lMj
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(detachedCriteria, PaginationSupport.PAGESIZE, s0dP3tz>
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startIndex); 3`yO&upk
} kyAN O
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public PaginationSupport findPageByCriteria L0"|4=
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(final DetachedCriteria detachedCriteria, finalint xg/(
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pageSize, %urvX$r4K
finalint startIndex){ \85%d0@3
return(PaginationSupport) }y6@YfV${
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getHibernateTemplate().execute(new HibernateCallback(){ ~'lT8 n_
publicObject doInHibernate IOZw[9](+
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(Session session)throws HibernateException { =!q]0#
Criteria criteria = F2}Fuupb.
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detachedCriteria.getExecutableCriteria(session); 7JBs7LG
int totalCount = aC[G_ACwc
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((Integer) criteria.setProjection(Projections.rowCount $B-/>Rz
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()).uniqueResult()).intValue(); |p[Mp:^^
criteria.setProjection &Tt7VYJfIV
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(null); n#x_da-m]
List items = ]%D!-[C%1
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criteria.setFirstResult(startIndex).setMaxResults F%-@_IsG#
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(pageSize).list(); Q,5PscE6&k
PaginationSupport ps = _C5i\Y)
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new PaginationSupport(items, totalCount, pageSize, e#Ao]gc
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p
startIndex); HSNj
return ps; ;SU<T^a
} ?h4[yp=w
}, true); %cn1d>M+I
} 6"G(Iq'2t3
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public List findAllByCriteria(final ]Ik~TW&
: ir#7/
DetachedCriteria detachedCriteria){ %U{sn\V
return(List) getHibernateTemplate P_3IFHe
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().execute(new HibernateCallback(){ Ld*Ds!*'/
publicObject doInHibernate #a=]h}&1?
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(Session session)throws HibernateException { [Ix6ArY
Criteria criteria = f?.VVlD
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detachedCriteria.getExecutableCriteria(session); RL4|!HzR
return criteria.list();
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} >P
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}, true); |_p7vl"
} T3oFgzoO
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public int getCountByCriteria(final A x8 >
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DetachedCriteria detachedCriteria){ e">&B]#}
Integer count = (Integer) ]\fHc"/
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getHibernateTemplate().execute(new HibernateCallback(){ (9]1p;
publicObject doInHibernate |u%;"N'p)
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(Session session)throws HibernateException { #9TL5-1y
Criteria criteria = Se!w(Y&
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detachedCriteria.getExecutableCriteria(session); }}k%.Qb
return D,.`mX
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criteria.setProjection(Projections.rowCount >oq\`E
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()).uniqueResult(); k:?)0Uh%^
} QaO9-:]eN
}, true); t+A*Ws*o
return count.intValue(); ^ulgZ2BQ|
} /95z1e
} !QVhP+l'H
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} OIe!
用户在web层构造查询条件detachedCriteria,和可选的 ?cWwt~N9
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 -_9*BvS]R
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PaginationSupport的实例ps。 b&yuy
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ps.getItems()得到已分页好的结果集 %m6qL
ps.getIndexes()得到分页索引的数组 D6lzcf
ps.getTotalCount()得到总结果数 !)oQ9,N
ps.getStartIndex()当前分页索引 ^"<Bk<b(
ps.getNextIndex()下一页索引 DC).p'0VL
ps.getPreviousIndex()上一页索引 2<UC^vZ
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 uy2~<)
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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 a=ZVKb
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一下代码重构了。 pFd{Tdh
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我把原本我的做法也提供出来供大家讨论吧: q<.k:v&
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首先,为了实现分页查询,我封装了一个Page类: RU/WI<O
java代码: =g6~2p=H
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/*Created on 2005-4-14*/ e%:vLE
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package org.flyware.util.page; |^Yz*r?BJ
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/** -}xK>
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* @author Joa mW)kWuOO
* 3BK
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*/ x2fqfrr_]
publicclass Page { "PTEt{qn
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/** imply if the page has previous page */ j/oc+ M^
privateboolean hasPrePage; _T.`+0UV
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/** imply if the page has next page */ V&j]*)
privateboolean hasNextPage; VXk[p
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/** the number of every page */ LsGO~EiJ
privateint everyPage; 3`D*AFQc
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/** the total page number */ eCJtNPd
privateint totalPage; <}&J|()
!b0A%1W;
/** the number of current page */ B:i$
privateint currentPage; ;L76V$&
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/** the begin index of the records by the current BJHWx,v
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query */ j."V>p8u$
privateint beginIndex; KJ&I4CU]^
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/** The default constructor */ >G?*rg4
public Page(){ .0/"~5
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} +5O^{Ce6
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/** construct the page by everyPage iX2exJto
* @param everyPage V?T&>s
* */
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public Page(int everyPage){ 7ko}X,aC
this.everyPage = everyPage; oP7)
} _o?aO C
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/** The whole constructor */ w"kBAi&
public Page(boolean hasPrePage, boolean hasNextPage, p;zT #%
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int everyPage, int totalPage, !6taOT>v
int currentPage, int beginIndex){ s 64@<oU<"
this.hasPrePage = hasPrePage; &