Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 " \`BPN
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Mp^^!AP 9
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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 mMV2h|W
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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 @X
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分页支持类: %A8Pkr<&E
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java代码: Ft )t`E'%j
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package com.javaeye.common.util; ,Y$F7&
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import java.util.List; Qk+=znJ
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publicclass PaginationSupport { JL?Cnk$!
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publicfinalstaticint PAGESIZE = 30; w'!ECm>*`
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privateint pageSize = PAGESIZE; -l\~p4U
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privateList items; bK!,Pc<
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privateint totalCount;
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privateint[] indexes = newint[0]; SAd97A:
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privateint startIndex = 0; I/mvQxp
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public PaginationSupport(List items, int (m<R0
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totalCount){ kuWK/6l4
setPageSize(PAGESIZE); IRlN++I!
setTotalCount(totalCount); 6e-#XCR{
setItems(items); BPwI8\V
setStartIndex(0); f<g>dQlE
} jK\V|5k
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public PaginationSupport(List items, int >]:N?[Y_~}
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totalCount, int startIndex){ ls [Ls
setPageSize(PAGESIZE); yB0jL:|a
setTotalCount(totalCount); X!,#'&p&
setItems(items); x1 .3W j
setStartIndex(startIndex); hq5NQi`
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} ;%BhhmR)[
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public PaginationSupport(List items, int _L?v6MTj
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totalCount, int pageSize, int startIndex){ >r;ABz/
setPageSize(pageSize); I++W0wa.n
setTotalCount(totalCount); xIS\4]F?r
setItems(items); gV<0Hj
setStartIndex(startIndex); ]]\)=F`n77
} qgwv=5|
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publicList getItems(){ 8|w5QvCU?3
return items; ZmEG<T05
} xP8iz?6"V
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publicvoid setItems(List items){ M3DxapG
this.items = items; l4iuu
} W2}%zux
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publicint getPageSize(){ i!CKA}",
return pageSize; &_<VZS
} OT-n\sL$
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publicvoid setPageSize(int pageSize){ lAdOC5+JX
this.pageSize = pageSize; t7{L[C$
} RnMB Gxa
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publicint getTotalCount(){ ]NaMZ
return totalCount; y3&Tv
} 4a(g<5wfI
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publicvoid setTotalCount(int totalCount){ |HaU3E*R
if(totalCount > 0){ aDm-X r
this.totalCount = totalCount; *]{9K
int count = totalCount / tU+@1~
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pageSize; M[:O(
if(totalCount % pageSize > 0) F,'^se4&
count++; ddUjs8VvJ
indexes = newint[count]; `U{o:
for(int i = 0; i < count; i++){ YWt"|
indexes = pageSize * qR [}EX&3
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} Ft3N#!ubl
}else{ i1b4 J
this.totalCount = 0; 3R)cbwL
} Y0/jH2 n
} '_q: vjX
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publicint[] getIndexes(){ opUKrB
return indexes; `A4QU,0
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} Bg+<*z-?e
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publicvoid setIndexes(int[] indexes){ pRQfx^On
this.indexes = indexes;
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} zCK y`u.
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publicint getStartIndex(){ g5kYyE
return startIndex; 6.
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} 2+T 8Y,g
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publicvoid setStartIndex(int startIndex){ $\YLmG
if(totalCount <= 0) cCo07R
this.startIndex = 0; f_i"/xC-/
elseif(startIndex >= totalCount) `-72>F ;T
this.startIndex = indexes bR>o!(M'Z\
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[indexes.length - 1]; dO 1-c`
elseif(startIndex < 0) 88 tFB
this.startIndex = 0; ()@.;R.Z
else{ 0[Xt,~
this.startIndex = indexes CX&yjT6`
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[startIndex / pageSize]; <
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} ?)Czl4J
} &xGfkCP.]
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publicint getNextIndex(){ <B]i80.
int nextIndex = getStartIndex() + Dyouk+08x
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pageSize; j=xtnIq
if(nextIndex >= totalCount) @\%)'WU
return getStartIndex(); 3PvZ_!G
else P`Hd*xh".j
return nextIndex; w-0O j
} t6<sNzF&
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publicint getPreviousIndex(){ Ie^Dn!0S
int previousIndex = getStartIndex() - W%cj39$
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pageSize; LH3N}J({
if(previousIndex < 0) }%o+1 <=
return0; c:?#zX
else 9I`Mm}v@
return previousIndex; Wvut)T
} c{m
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} eB<V%,%N#
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抽象业务类 I9:G9
java代码: 9Th32}H
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/** E1l\~%A
* Created on 2005-7-12 g9([3pV,
*/ sl^s9kx;C$
package com.javaeye.common.business; %|D\j-~
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import java.io.Serializable; L!8 -:)0b
import java.util.List; (2O} B.6
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import org.hibernate.Criteria; #U!(I#^3
import org.hibernate.HibernateException; Kbz7
import org.hibernate.Session; 8CnI%_Su
import org.hibernate.criterion.DetachedCriteria; @R'g@+{I
import org.hibernate.criterion.Projections; 9U }MXY0
import M k'n~.mb
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org.springframework.orm.hibernate3.HibernateCallback; #5ohmp,u
import SQ^^1.V&/Y
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org.springframework.orm.hibernate3.support.HibernateDaoS q5I4'6NF
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upport; +QXYU8bYZ
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import com.javaeye.common.util.PaginationSupport; w}U5dM`
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public abstract class AbstractManager extends I*vj26qvg
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HibernateDaoSupport { vHI"C %
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privateboolean cacheQueries = false; *xv/b=
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privateString queryCacheRegion; ?(,5eg
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publicvoid setCacheQueries(boolean (1elF)
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cacheQueries){ VH7iH|eW
this.cacheQueries = cacheQueries; W3o}.|]
} J++sTQ(!?
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publicvoid setQueryCacheRegion(String a_pCjG89
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queryCacheRegion){ /ie3H,2
this.queryCacheRegion = LKqog%,c
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queryCacheRegion; :i,c<k
} H%NLL4&wu
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publicvoid save(finalObject entity){ #a'x)$2;R|
getHibernateTemplate().save(entity); [#Nx>RY
} n7, 6a
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publicvoid persist(finalObject entity){ :S+U}Sm[
getHibernateTemplate().save(entity); #H|j-RM2
} r;%zGF p
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publicvoid update(finalObject entity){ u'~b<@wHB
getHibernateTemplate().update(entity); >uPde5"ZF-
} vq0M[Vy
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publicvoid delete(finalObject entity){ 4na4Jsq{
getHibernateTemplate().delete(entity); #o"HD6e
} TJw.e/
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publicObject load(finalClass entity, L1Cn
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finalSerializable id){ Q5Ghki
return getHibernateTemplate().load "PX3%II
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(entity, id); !iitx U
} EkjK92cF
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publicObject get(finalClass entity, m"|(w`n]E+
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finalSerializable id){ $jeDVH
return getHibernateTemplate().get (fGJP*YO
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(entity, id); xwH|ryfs,Z
} E'BH7JV
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publicList findAll(finalClass entity){ FUqhSW
return getHibernateTemplate().find("from dW^_tzfF7
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" + entity.getName()); qiKtR
} A6x_!
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publicList findByNamedQuery(finalString zWmo
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namedQuery){ !
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return getHibernateTemplate u&d v[
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().findByNamedQuery(namedQuery); ! ?U^+)^$
} Mevyj;1t
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publicList findByNamedQuery(finalString query, (+Kof
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finalObject parameter){ =
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return getHibernateTemplate %]sEt{
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().findByNamedQuery(query, parameter); hPXVPLm7I
} }zS&H-8K
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publicList findByNamedQuery(finalString query, seV;f^-hR
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finalObject[] parameters){ )|^<woli,
return getHibernateTemplate 5wFS.!xD
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().findByNamedQuery(query, parameters); f({-j%m
} ]I' xLh`
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publicList find(finalString query){ >
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return getHibernateTemplate().find 9@z|2z2\G
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(query); v/00LR
} X3=Jp'p$h
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publicList find(finalString query, finalObject I^\bS
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parameter){ nIqY}??
return getHibernateTemplate().find ttq< )4
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(query, parameter); 0)Xue9AS
} cLko
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public PaginationSupport findPageByCriteria D%Jc?6/I#3
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(final DetachedCriteria detachedCriteria){ 1>@|
return findPageByCriteria j!_^5d#d
*(q8?x0>
(detachedCriteria, PaginationSupport.PAGESIZE, 0); f!8m
} N9h@1'>
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public PaginationSupport findPageByCriteria _DvPF~
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(final DetachedCriteria detachedCriteria, finalint ,bwopRcA
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startIndex){ NG W{Z~l
return findPageByCriteria rMg{j
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(detachedCriteria, PaginationSupport.PAGESIZE, E?h2e~ ,]
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startIndex); 'W2$wN+P
} SU}oKii
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public PaginationSupport findPageByCriteria iGeT^!N
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(final DetachedCriteria detachedCriteria, finalint Qnb?hvb"d
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pageSize, M*@aA
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finalint startIndex){ n6UU6t{
return(PaginationSupport) qkG;YGio
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getHibernateTemplate().execute(new HibernateCallback(){
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publicObject doInHibernate Qufv@.'AY
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(Session session)throws HibernateException { l=?y=2+
Criteria criteria = =2)$|KC
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detachedCriteria.getExecutableCriteria(session); z,x"vK(
int totalCount = OQ&D?2r
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((Integer) criteria.setProjection(Projections.rowCount Rpd/9x.)&
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()).uniqueResult()).intValue(); <RVtLTd/
criteria.setProjection +rpd0s49
}vA
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(null); [qMO7enu#
List items = 8=o5;]Cg
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criteria.setFirstResult(startIndex).setMaxResults eh/OCzWH
]S aH/$
(pageSize).list(); k3.p@8@:
PaginationSupport ps = T9<nD"=:
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new PaginationSupport(items, totalCount, pageSize, j!o3g;j
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startIndex); 0THAI
return ps; o9d$
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} ;Hp' x_xQ
}, true); *vE C,)
} v oS"X
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public List findAllByCriteria(final ~@?-|xLqQ
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DetachedCriteria detachedCriteria){ j/mp.'P1k
return(List) getHibernateTemplate +Q]'kJ<s
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().execute(new HibernateCallback(){ +Qvgpx >
publicObject doInHibernate EI+/%.,
@,`=~_J
(Session session)throws HibernateException { n}'.6
Criteria criteria = ]hVXFHrR
LA %al @
detachedCriteria.getExecutableCriteria(session); 'nt,+`.y6
return criteria.list(); <n#V
} TZyQOjUu
}, true); XJ/kB8
} F S+^r\)
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public int getCountByCriteria(final NKhR%H
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DetachedCriteria detachedCriteria){ z n8ig/C
Integer count = (Integer) U`_vF~el~
)&!@O$RS8(
getHibernateTemplate().execute(new HibernateCallback(){ KY&,(z
publicObject doInHibernate W@C tF U9
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(Session session)throws HibernateException { xxcDd_z
Criteria criteria = QF "&~
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detachedCriteria.getExecutableCriteria(session); cP=mJ1
return +p6\R;_E
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criteria.setProjection(Projections.rowCount wO)KQ~ yX
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()).uniqueResult(); l:,UN07s
} &U)s%D8e;d
}, true); CHP6H}#|g
return count.intValue(); Z M, ^R?e
} iB`]Z@ZC
} ?yeC
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用户在web层构造查询条件detachedCriteria,和可选的 b/Q"j3
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 svjFy/T(lL
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PaginationSupport的实例ps。 bXL a~r4\
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ps.getItems()得到已分页好的结果集 F<Z=%M3e
ps.getIndexes()得到分页索引的数组 (k.7q~:
ps.getTotalCount()得到总结果数 (kOv
ps.getStartIndex()当前分页索引 =PM#eu
ps.getNextIndex()下一页索引 l%~zj,ew
ps.getPreviousIndex()上一页索引 _'p;V[(+M
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5D*V%v
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 *3($s_r>
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一下代码重构了。 (1]@ fCd +
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我把原本我的做法也提供出来供大家讨论吧: C,u.!g;lm
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首先,为了实现分页查询,我封装了一个Page类: ur7a%NH
java代码: *OcptmY<
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/*Created on 2005-4-14*/ kcUt!PL
package org.flyware.util.page; M4\Io]}-M
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/** TY?io@
* @author Joa imQNfNm
* uB5o
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*/ _lqAxWH
publicclass Page { Lr&BZM
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/** imply if the page has previous page */ }cmL{S
privateboolean hasPrePage; '|R|7nQAj
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/** imply if the page has next page */ q[K)bg{HB
privateboolean hasNextPage; N6'Y
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/** the number of every page */ s:P-F0q!&
privateint everyPage; Kn|dnq|G
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/** the total page number */ e~dU "
privateint totalPage; q1Mk_(4oJ
cG6+'=]3<
/** the number of current page */ "H@AT$Ny(
privateint currentPage; 8~&v\GDkF
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/** the begin index of the records by the current )\^OI:E
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query */ VF.S)='>Eu
privateint beginIndex; [MG:Ym).2`
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/** The default constructor */ Uz_{jAhW]
public Page(){ ;d:7\
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} 4 @h6|=
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/** construct the page by everyPage Emo]I[<&q
* @param everyPage EIAT*l :NW
* */ k9
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public Page(int everyPage){ wqsnyP/m
this.everyPage = everyPage; WJWhx4Hk
} V-57BKeDz
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/** The whole constructor */ f,*e?9@;s
public Page(boolean hasPrePage, boolean hasNextPage, fpUX
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int everyPage, int totalPage, ^z1WPI
int currentPage, int beginIndex){ APya&