Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 3%WB?kc
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 #3uv^m LGa
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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 Sp`l>BL
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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 ycA<l"
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分页支持类: i~B?p[
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java代码: r(,U{bU<
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package com.javaeye.common.util; ^FCXcn9
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import java.util.List; q'3{M]Tk
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publicclass PaginationSupport { -V$|t<
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publicfinalstaticint PAGESIZE = 30; }F08o,`?
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privateint pageSize = PAGESIZE; H MOIUd
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privateList items; [8V;Q
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privateint totalCount; _3IT3mb2n
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privateint[] indexes = newint[0]; \Ne`9k
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privateint startIndex = 0; ':4cQ4Z
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public PaginationSupport(List items, int 1]xk:u4LA
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totalCount){ 8$FH;=
setPageSize(PAGESIZE); n Ja!&G&
setTotalCount(totalCount); IsXNAYj
setItems(items); MT6p@b5
setStartIndex(0); z8=THz2f
} vu0Ql1
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public PaginationSupport(List items, int pn" !wqg
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totalCount, int startIndex){ gC7!cn
setPageSize(PAGESIZE); `Fqth^RK?p
setTotalCount(totalCount); RB>=#03
setItems(items); K)SWM3r
setStartIndex(startIndex); A|biOz
} .:_'l)-
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public PaginationSupport(List items, int 7H
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totalCount, int pageSize, int startIndex){ H4M=&"ll}
setPageSize(pageSize); V 6}5^W
setTotalCount(totalCount); 6@]o,O
setItems(items); O>`k@X@9/
setStartIndex(startIndex); kUBE+a6#
} _{|a<Keq|
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publicList getItems(){ GrF4*I`q
return items; aZZ0eH
} :8S;34Y;
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publicvoid setItems(List items){ b42%^E
this.items = items; hB[bth
} vNi;)"&*
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publicint getPageSize(){ !Uiq3s`1T
return pageSize; _z p<en[
} =7!s8D,[
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publicvoid setPageSize(int pageSize){ (Y py}
this.pageSize = pageSize; =DwLNyjU4
} a)|y0w)vV
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publicint getTotalCount(){ ?mMM{{%(.
return totalCount; _\AQJ?<M
} *QK)
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publicvoid setTotalCount(int totalCount){ S5>s&
if(totalCount > 0){ V#G)w~
this.totalCount = totalCount; <4{m99
int count = totalCount / z|s(D<*w
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pageSize; ^y,h0?Z9
if(totalCount % pageSize > 0) aEf3hB* ~
count++; TX)W.2u=
indexes = newint[count]; dv+Gv7&2/
for(int i = 0; i < count; i++){ x,nl PU
indexes = pageSize * CU=sQfE
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} |s3;`Nxu7
}else{ 'Agw~
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this.totalCount = 0; 8T+9
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} >H+tZV
} {@X>!]
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publicint[] getIndexes(){ W" =l@}I
return indexes;
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} ByqVNz0L
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publicvoid setIndexes(int[] indexes){ =A!oLe$%
this.indexes = indexes; /? %V%
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} 9L$OSy|
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publicint getStartIndex(){ GR|\OJ<2
return startIndex; P!-RZEt$
} DE.].FD'
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publicvoid setStartIndex(int startIndex){ v4e4,Nt
if(totalCount <= 0) P'wo+Tn*
this.startIndex = 0; 5mamWPw
elseif(startIndex >= totalCount) L#SW!
this.startIndex = indexes #ss/mvc3
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[indexes.length - 1]; GZO:lDdA
elseif(startIndex < 0) :E}y
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this.startIndex = 0; 4dixHpq'
else{ :]:)c8!6
this.startIndex = indexes ;_\yg)X,
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[startIndex / pageSize]; Mbc&))A
} qu^g~"s
} !aSj1
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publicint getNextIndex(){ 9(t(sP_
int nextIndex = getStartIndex() + ;6 @sC[
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pageSize; LqYyIbsvf
if(nextIndex >= totalCount) Tdh(J",d
return getStartIndex(); S ,F[74K
else fTXip)n!r
return nextIndex; P;"moluE;
} \me5"ZU
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publicint getPreviousIndex(){ )l9KDObis
int previousIndex = getStartIndex() - ECt<\h7}
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pageSize; 'v^Vg
if(previousIndex < 0) Xz @#,F:@
return0; k.C&6*l!5;
else }E ]l4N2
return previousIndex; \v&zsv\B@
} U[MeK)*
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} xc*a(v0
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抽象业务类 WowT!0$
java代码: M(L6PyEa!Y
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/** (s&:D`e
* Created on 2005-7-12 S3M!"l
*/ #OPEYJ;*9d
package com.javaeye.common.business; ^?RH<z
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import java.io.Serializable; |8f }3R 9
import java.util.List; .1TuHC\mC
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import org.hibernate.Criteria; Iuz_u2"C
import org.hibernate.HibernateException; |\dv$`_T
import org.hibernate.Session; -$"$r ~ad
import org.hibernate.criterion.DetachedCriteria; =Rx4ZqTI|
import org.hibernate.criterion.Projections; keC'/\e
import E"9(CjbQ[
\(Oc3+n6
org.springframework.orm.hibernate3.HibernateCallback; 7f+@6jqD\)
import 0)SRLHTY%
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org.springframework.orm.hibernate3.support.HibernateDaoS <oJ?J^
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upport; #w.0 Cc
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import com.javaeye.common.util.PaginationSupport; PwW$=M{\.
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public abstract class AbstractManager extends A:ts_*
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HibernateDaoSupport {
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privateboolean cacheQueries = false; lIS`_H}
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privateString queryCacheRegion; N `:MF 9
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publicvoid setCacheQueries(boolean 9vP;i= fr
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cacheQueries){ Bc.de&Bxz_
this.cacheQueries = cacheQueries; zoi0Z
} ke8g tbm
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publicvoid setQueryCacheRegion(String _^Q!cB'~/`
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queryCacheRegion){ x?o#}:S
this.queryCacheRegion = RAl/p9\A+
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queryCacheRegion; R_B0CM<!
} 27N;>
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publicvoid save(finalObject entity){ a%.W9=h=M(
getHibernateTemplate().save(entity); 0e<>2AL
} %d];h
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publicvoid persist(finalObject entity){ d7](fw@c
getHibernateTemplate().save(entity); rl7up
} 7P2n{zd,
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publicvoid update(finalObject entity){ o3`U;@ &u
getHibernateTemplate().update(entity); w\s`8S
} :se$<d%
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publicvoid delete(finalObject entity){ >BO$tbU5b
getHibernateTemplate().delete(entity); |hxiARr4
} U Buh'?j
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publicObject load(finalClass entity, ?'0!>EjY"
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finalSerializable id){ T`wDdqWbEG
return getHibernateTemplate().load QNOdt 2NN
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(entity, id); vN^.MR+<
} cy.r/Z}
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publicObject get(finalClass entity, _?H3*!>3
2, )>F"R
finalSerializable id){ pDlrK&;\z
return getHibernateTemplate().get T+nID@"36
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(entity, id); Lq5xp<
} 60^j<O
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publicList findAll(finalClass entity){ -B#1+rUW
return getHibernateTemplate().find("from U.,S.WP+d
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" + entity.getName()); E>s+"y
} s 4_Dqm
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publicList findByNamedQuery(finalString \"(?k>]E
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namedQuery){ e:Y+-C5
return getHibernateTemplate vQLYWRXiA
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().findByNamedQuery(namedQuery); Oe;#q
} w"?Q0bhV9y
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publicList findByNamedQuery(finalString query, `;Tf _6c
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finalObject parameter){ h,R Isq;`
return getHibernateTemplate J-tqEK*
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().findByNamedQuery(query, parameter); ~BuzI9~7P
} $h
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publicList findByNamedQuery(finalString query, +]cf/_8+s
}
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finalObject[] parameters){ 0\XWdTj{
return getHibernateTemplate eZOR{|z
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().findByNamedQuery(query, parameters); %urvX$r4K
} \85%d0@3
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publicList find(finalString query){ qm!cv;}c1
return getHibernateTemplate().find Lbrl CB+
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(query); 56z>/`=
} ?@4Mt2Z\
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publicList find(finalString query, finalObject i'li;xUhZ
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parameter){ $B-/>Rz
return getHibernateTemplate().find 0RA#Y(IR
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(query, parameter); `[5xncZ-
} {.$7g8]I
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public PaginationSupport findPageByCriteria pYQSn.`V~
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(final DetachedCriteria detachedCriteria){ pRV.\*:c
return findPageByCriteria P^<3 Z)L
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); e2c'Wab
} w>j5oz}
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public PaginationSupport findPageByCriteria QD,m`7(
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(final DetachedCriteria detachedCriteria, finalint =h4uN,
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startIndex){ "<0 !S~]
return findPageByCriteria +h"i6`g
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(detachedCriteria, PaginationSupport.PAGESIZE, !6-t_S
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startIndex); `3\U9ZH23
} I%r7L
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public PaginationSupport findPageByCriteria E>QS^)ih
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(final DetachedCriteria detachedCriteria, finalint k*;U?C!
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pageSize, 'S6zk wC]
finalint startIndex){ M
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return(PaginationSupport) 0bh
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getHibernateTemplate().execute(new HibernateCallback(){ -Ct+W;2
publicObject doInHibernate c9[{P~y
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(Session session)throws HibernateException { d~QKZ&jf
Criteria criteria = acS~%^"<_
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detachedCriteria.getExecutableCriteria(session); WDghlC6g!l
int totalCount = L-E &m* %
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((Integer) criteria.setProjection(Projections.rowCount _'cB<9P
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()).uniqueResult()).intValue(); Se!w(Y&
criteria.setProjection c\ZI
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(null); 1sg:8AA
List items = cZN<}n+q
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criteria.setFirstResult(startIndex).setMaxResults 17'd~-lE
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(pageSize).list(); S Yi !%
PaginationSupport ps = ^ulgZ2BQ|
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new PaginationSupport(items, totalCount, pageSize, !QVhP+l'H
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startIndex); -%J9!(
return ps; Vyi.:lL _8
} w%`S>+kX&
}, true); 'yH
} &V+_b$
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public List findAllByCriteria(final ,$t1LV;o=
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DetachedCriteria detachedCriteria){ OH>Gc-V
return(List) getHibernateTemplate vUbgSI
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().execute(new HibernateCallback(){ D,..gsg
publicObject doInHibernate ^/?7hbr
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(Session session)throws HibernateException { rEp\ld
Criteria criteria = C"n!mr{srt
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detachedCriteria.getExecutableCriteria(session); Zq33R`
return criteria.list(); a :*N0
} yH:p*|% :
}, true); &I
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} {=?[:5
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public int getCountByCriteria(final XS2/U<sd
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DetachedCriteria detachedCriteria){ F/Js K&&
Integer count = (Integer) rCqwJoC`v
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getHibernateTemplate().execute(new HibernateCallback(){ z4D)Xy"/
publicObject doInHibernate 'J*'{
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(Session session)throws HibernateException { U^[AW$WzU
Criteria criteria = i;~.kgtq4
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detachedCriteria.getExecutableCriteria(session); 7p'pz8n`X
return 5+{oQs_
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criteria.setProjection(Projections.rowCount KU"+i8"
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()).uniqueResult(); Tr>_R%b K
} 9E5*%Hu_
}, true); yT<"?S>D
return count.intValue(); zytW3sTZA
} GBZ u<t/
} m==DBh
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用户在web层构造查询条件detachedCriteria,和可选的 xC
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 4J'0k<5S
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PaginationSupport的实例ps。 HrLws95'
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ps.getItems()得到已分页好的结果集 Jon3ywd1Y
ps.getIndexes()得到分页索引的数组 EpACd8Fb
ps.getTotalCount()得到总结果数 $[HCetaqV
ps.getStartIndex()当前分页索引 w$s6NBF7
ps.getNextIndex()下一页索引 gZ>&cju
ps.getPreviousIndex()上一页索引 9`qw,X&AK_
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 JI-.SR
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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 zO9WqP_`iR
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一下代码重构了。 |R91|-H
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我把原本我的做法也提供出来供大家讨论吧: KX\=wFbP)
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首先,为了实现分页查询,我封装了一个Page类: 9;*B*S~znW
java代码: 8:I-?z;S
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/*Created on 2005-4-14*/ wmbG$T%k
package org.flyware.util.page; (@BB@G
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/** DcRoW
* @author Joa b~ig$!N]
* @QpL*F
*/ S{XO3
publicclass Page { |'}r-}
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/** imply if the page has previous page */ UaXIrBc
privateboolean hasPrePage; ;\13x][
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/** imply if the page has next page */ jv29,46K
privateboolean hasNextPage; FD~uUZTM
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/** the number of every page */ ~r})&`5
privateint everyPage; AKLFUk
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/** the total page number */ `}
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privateint totalPage; %dd B$(
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/** the number of current page */ UBnHtsM
privateint currentPage; P
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/** the begin index of the records by the current +:C.G[+
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query */ FgP{
privateint beginIndex; +*qTZIXj
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/** The default constructor */ %gqu7}'
public Page(){ A$zC$9{0I
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} s<C66z
p)Ht =~
/** construct the page by everyPage Ba%b]vp
* @param everyPage Y!u">M#@
* */ dqt}:^L*0g
public Page(int everyPage){ .zW.IM}Z
this.everyPage = everyPage; >6(e6/C-9
} zU|'IW&
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/** The whole constructor */ }&Xf<6
public Page(boolean hasPrePage, boolean hasNextPage, IQ~EL';<w
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int everyPage, int totalPage, Q;z'"P
int currentPage, int beginIndex){ >O1u![9K|w
this.hasPrePage = hasPrePage; 9Pm|a~[m
this.hasNextPage = hasNextPage; =p8iYtI
this.everyPage = everyPage; We"\nOP
this.totalPage = totalPage; kQ6YQsJ.*
this.currentPage = currentPage; !*k'3rKOW
this.beginIndex = beginIndex; `LTD|0;
} 2F,?}jJ.K
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/** riglEA[^
* @return FePWr7Ze
* Returns the beginIndex. t/x]vCP,2D
*/ Zq/=uB7Z
publicint getBeginIndex(){ `g}en%5b\
return beginIndex; 2DBFY1[Pk
} 5.Nc6$
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/** 6,p;8I
* @param beginIndex /-ewCCzZV
* The beginIndex to set. "?
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*/ -A"0mS8L
publicvoid setBeginIndex(int beginIndex){ g3'yqIjQL
this.beginIndex = beginIndex; >ufN[ab
} 4Z{ r
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/** a&n}pnEn)
* @return hya
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* Returns the currentPage. `=W#owAF
*/ PtKrks|y
publicint getCurrentPage(){ A$J?-
return currentPage; v kW2&
} WWIQ6EJO
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/** 7lQ:}&
* @param currentPage Zdu8axK:
* The currentPage to set. Wl>$<D4mO[
*/ 9>L{K
publicvoid setCurrentPage(int currentPage){ /5R?(-
this.currentPage = currentPage; -hO[^^i9
} ='.G,aJ9
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/** NK(; -~{P
* @return lHoV>k
* Returns the everyPage. 4,6nk.$yN
*/ \8 -PCD
publicint getEveryPage(){ m-|~tve
return everyPage; F!6;<!&