Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 HJR<d&l;p
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 K, 5ax@
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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 fNPj8\#V,
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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 gj,J3x4TK/
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分页支持类: J*!:ar
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java代码: [?@wCY4=
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package com.javaeye.common.util; /2Lo{v=0[
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import java.util.List; uyt-q|83=
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publicclass PaginationSupport { j&
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publicfinalstaticint PAGESIZE = 30; n qLAby_
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privateint pageSize = PAGESIZE; Au} ;z6k
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privateList items; }K80G~O2<
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privateint totalCount; 1DLG]-j}
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privateint[] indexes = newint[0]; YB
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privateint startIndex = 0; uy _i{Y|
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public PaginationSupport(List items, int .k,Jt+
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totalCount){ 2\63&C^
setPageSize(PAGESIZE); $7n#\h
setTotalCount(totalCount); L;M^>{>
setItems(items); +'['HQ)
setStartIndex(0); rW~?0
} *V6QBe
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public PaginationSupport(List items, int ,+/9K)X
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totalCount, int startIndex){ =Etwa
setPageSize(PAGESIZE); kV\-%:-
setTotalCount(totalCount); w,![;wG
setItems(items); P,/13tZ#3
setStartIndex(startIndex); 3 "l
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} U8K&Q4^
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public PaginationSupport(List items, int S*CLt
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totalCount, int pageSize, int startIndex){ mC:X4l]5
setPageSize(pageSize); o9i#N
setTotalCount(totalCount); nGx ~)T
setItems(items); L7Qo-
setStartIndex(startIndex); 'je8k7`VA
} r}R^<y@I
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publicList getItems(){ 3V/_I<y
return items; Eg`R|CF
} L{2b0Zh'
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publicvoid setItems(List items){ K}PvrcO1
this.items = items; ]{|fYt_-
} C|4U78f{
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publicint getPageSize(){ Iys6R?~
return pageSize; |"CJ
} DYo<5^0
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publicvoid setPageSize(int pageSize){ (|g").L
this.pageSize = pageSize; n2n00%Wu[
} <`c25ih.4
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publicint getTotalCount(){ vIVw'Z(g}
return totalCount; :%/\1$3P
} d[Rb:Yw
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publicvoid setTotalCount(int totalCount){ t/JOERw
if(totalCount > 0){ 3D
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this.totalCount = totalCount; *nYB o\@g
int count = totalCount / uQ:Qb|
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pageSize; ,'FD}yw4v
if(totalCount % pageSize > 0) '1CD-
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count++; tCZpfZ@+=
indexes = newint[count]; T$H2'tK|
for(int i = 0; i < count; i++){ pNp^q/-yB
indexes = pageSize * L3B8IDq
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i; G$cxDGo
} nHSTeFI?
}else{ ]@*tfz\YaH
this.totalCount = 0; &}zRH}s;
} LkaG8#m1R
} {V[Ha~b%*
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publicint[] getIndexes(){ (-bRj#
return indexes; S&n[4*
} De;, =BSp
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publicvoid setIndexes(int[] indexes){ f4R1$(<
this.indexes = indexes; dF$KrwDK
} > P(eW7RL
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publicint getStartIndex(){ 9#u }^t
return startIndex; '#H&:Htm;L
} *7\W=-
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publicvoid setStartIndex(int startIndex){ fb/qoZ
if(totalCount <= 0) B9wp*:.
this.startIndex = 0; otU@X 3<_
elseif(startIndex >= totalCount) ?3[tJreVj
this.startIndex = indexes P!5Z]+B#
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[indexes.length - 1]; .Nc_n5D6
elseif(startIndex < 0) BjYOfu'~z
this.startIndex = 0; p[u4,
else{ Ga.0Io&}C
this.startIndex = indexes 6?O}Q7G
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[startIndex / pageSize]; dnix:'D1
} ^ZR8s^X
} 3i6h"Wu`n
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publicint getNextIndex(){ jSB'>m]
int nextIndex = getStartIndex() + *y{+W
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pageSize; *=TYVM9
if(nextIndex >= totalCount) x =h0Fq,T
return getStartIndex(); C*a,<`
else ;t|,nz4kJ
return nextIndex; |f<9miNu
} *(icR
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publicint getPreviousIndex(){ zMr&1*CDX
int previousIndex = getStartIndex() - ~U9q-/(J/
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pageSize; $]1qbE+
if(previousIndex < 0) .ots?Ns
return0; lr0M<5d=p
else ).Q[!lly
return previousIndex; "ct58Y@
} bH,M,xIL2
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} 1 )'Iu`k/
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抽象业务类 Sj@15 W
java代码: 94y9W#
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/** &*A:[b\
* Created on 2005-7-12 -zdmr"CA
*/ :Pf>Z? /d
package com.javaeye.common.business; n7S;
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import java.io.Serializable; {pC\\}
import java.util.List; `6}Yqh))
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import org.hibernate.Criteria; m@[3~
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import org.hibernate.HibernateException; 6#vI;d[^
import org.hibernate.Session; +<{m45
import org.hibernate.criterion.DetachedCriteria; 5e8xKL
import org.hibernate.criterion.Projections; Fv A8T2-v
import h\FwgkJP
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org.springframework.orm.hibernate3.HibernateCallback; fdLBhe#9M
import UBIIo'u
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org.springframework.orm.hibernate3.support.HibernateDaoS (gU2"{:]J
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upport; .:N:p We
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import com.javaeye.common.util.PaginationSupport; kT2Wm/L
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public abstract class AbstractManager extends O"iak
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HibernateDaoSupport { zofx+g\(W
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privateboolean cacheQueries = false; 59Nd}wPO;
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privateString queryCacheRegion; LQ>$>A(
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publicvoid setCacheQueries(boolean [T]Bf o
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cacheQueries){ {=iyK/Uf
this.cacheQueries = cacheQueries; Wn~ZA#
} R;'?;I
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publicvoid setQueryCacheRegion(String In+^V([u+_
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queryCacheRegion){ .<.#aY;N
this.queryCacheRegion = v2=/[E@
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queryCacheRegion; o3\,gzJ
} 3.FR C
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publicvoid save(finalObject entity){ Km"&mT $
getHibernateTemplate().save(entity); e96#2A5f
} }Aw47;5q;
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publicvoid persist(finalObject entity){ h1c{?xH2r
getHibernateTemplate().save(entity); 8t=3
} yKlU6t&`
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publicvoid update(finalObject entity){ FJF3B)Va|
getHibernateTemplate().update(entity); F9O`HFVK
} BjvdnbJg
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publicvoid delete(finalObject entity){ Wp`C:H
getHibernateTemplate().delete(entity); dE GX3 -
} 69iM0X!'u
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publicObject load(finalClass entity, 2+Zti8
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finalSerializable id){ ?b"Vj+1:x
return getHibernateTemplate().load LyV#j>gD
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(entity, id); #fN/LO
} |
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publicObject get(finalClass entity, 9cz )f\
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finalSerializable id){ ng
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return getHibernateTemplate().get oSmjs
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(entity, id); 0$l&i=L
} {Hr>X
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publicList findAll(finalClass entity){ NN11}E6
return getHibernateTemplate().find("from ey*,StT5a
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" + entity.getName()); umryA{Ps
} ExQ--!AC=
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publicList findByNamedQuery(finalString ^(J-dK
],Ab cTX
namedQuery){ TG?fUD V
return getHibernateTemplate
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().findByNamedQuery(namedQuery); g&P9UW>qS
} GV=V^Fl .
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publicList findByNamedQuery(finalString query, 0O_E\- =
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finalObject parameter){ q4 $sc_0i
return getHibernateTemplate kr6:{\DU:B
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().findByNamedQuery(query, parameter); noFh p
} ,d5ia4\K
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publicList findByNamedQuery(finalString query, 2AmR(vVa"
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finalObject[] parameters){ |O2|`"7
return getHibernateTemplate R+C+$?4NG
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().findByNamedQuery(query, parameters); Kgps_tY%
} []!tT-Gzy
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publicList find(finalString query){ uLF\K+cz
return getHibernateTemplate().find Gl=@>Dc%
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(query); l8eT{!4
} bl6':m+
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publicList find(finalString query, finalObject nsy!p5o
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parameter){ A5`#Ot*3
return getHibernateTemplate().find jD$;q7fB
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(query, parameter); Uzy;#q
} ~y( ,EO
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public PaginationSupport findPageByCriteria HrM)jC<~
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(final DetachedCriteria detachedCriteria){ A632 :V
return findPageByCriteria N. ItyV
}S1Z>ZA5
(detachedCriteria, PaginationSupport.PAGESIZE, 0); Mp}!+K
} [J(@$Qix
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public PaginationSupport findPageByCriteria PTfN+
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(final DetachedCriteria detachedCriteria, finalint \k2C 5f
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startIndex){ /TR"\xQF
return findPageByCriteria <T4 7kL I
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(detachedCriteria, PaginationSupport.PAGESIZE, v]UU&Jq8U
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startIndex); )eIz{Mdp=
} *+4>iL*:
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public PaginationSupport findPageByCriteria A,-[/Z K/
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(final DetachedCriteria detachedCriteria, finalint V{/)RZ/
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pageSize, v)v{QNQp^
finalint startIndex){ |TNiKy
return(PaginationSupport) #]N&6ngJ
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getHibernateTemplate().execute(new HibernateCallback(){ x _YV{
publicObject doInHibernate Q9Xmb2LN
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(Session session)throws HibernateException { 8xeun~e"vS
Criteria criteria = N`L'
4v)
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detachedCriteria.getExecutableCriteria(session); <7sF<KD
int totalCount = PEwW*4Xo
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((Integer) criteria.setProjection(Projections.rowCount T^-H_|/M
"=v J}
()).uniqueResult()).intValue(); [W8iM7D
criteria.setProjection i &SBW0)
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(null); 0YsN82IDD
List items = ?L~=Z\H
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criteria.setFirstResult(startIndex).setMaxResults iX9[Q0g=oQ
=."WvBKg
(pageSize).list(); ^0,&R\e+
PaginationSupport ps = G+\~rl
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new PaginationSupport(items, totalCount, pageSize, !A ydhe
+ - KRp1qq
startIndex); tr67ofld|
return ps; /n<Ncf
} a_#eGe>
}, true); Z:o'
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} szM=U$jKq
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public List findAllByCriteria(final #\!hBL
@b
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DetachedCriteria detachedCriteria){ fAA@ziKg
return(List) getHibernateTemplate #D*J5k>2
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().execute(new HibernateCallback(){ SJ|.% gn
publicObject doInHibernate N6 }i>";_;
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(Session session)throws HibernateException { yKk,);
Criteria criteria = JcALFKLB
@SMy0:c:
detachedCriteria.getExecutableCriteria(session); +
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return criteria.list(); Pt)}HF|u
} T;pn -
}, true); ~4
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} tZ{q\+h
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public int getCountByCriteria(final @BQBNGR 1
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DetachedCriteria detachedCriteria){ EpS8,[w
Integer count = (Integer) EA{*%9 A
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getHibernateTemplate().execute(new HibernateCallback(){ 7J_f/st
publicObject doInHibernate R8W44I*R:
8LM1oal}
(Session session)throws HibernateException { !{ )AV/\D
Criteria criteria = arH\QPaka'
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detachedCriteria.getExecutableCriteria(session); o%JIJ7M
return _w,0wn9N$
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criteria.setProjection(Projections.rowCount -v+^x`HR
0*M}QXt
()).uniqueResult(); qN,FX#DP
} U=#ylQ
}, true); (c|qX-%rC
return count.intValue(); Jt,
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} T-8nUo}i
} B91PlM.
}
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用户在web层构造查询条件detachedCriteria,和可选的 6zZR:ej
+\$|L+@Z
startIndex,调用业务bean的相应findByCriteria方法,返回一个 l5nDt$Ex
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PaginationSupport的实例ps。 0!\q
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ps.getItems()得到已分页好的结果集 VIdoT2
ps.getIndexes()得到分页索引的数组 AFUl
ps.getTotalCount()得到总结果数 0lh6b3tdP
ps.getStartIndex()当前分页索引 xyWdzc](p
ps.getNextIndex()下一页索引 kU>|E<c*
ps.getPreviousIndex()上一页索引 [t)i\ }V
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Z-!T(:E]
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 4ux5G`oL
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一下代码重构了。 hkI);M+@6
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我把原本我的做法也提供出来供大家讨论吧: 6u;(R0n
shZ<j7gqI
首先,为了实现分页查询,我封装了一个Page类: [&V%rhi
java代码: N)Kr4GC
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/*Created on 2005-4-14*/ P9wDTZ
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package org.flyware.util.page; dig76D_[e
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/** bOKNWI
* @author Joa ob
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* Ma#-'J
*/ l/NK.Jr
publicclass Page { HpAZ{P7
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/** imply if the page has previous page */ 5Oq ;V:7
privateboolean hasPrePage; eO G%6C%a
AFED YRX
/** imply if the page has next page */ cf!R
privateboolean hasNextPage; itvdzPO
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/** the number of every page */ `I$A;OPK7
privateint everyPage; )v0vdAh'b
v%[mt`I
/** the total page number */ N/VIP0Kb
privateint totalPage; >m!.l{*j>N
_jz=BRO$
/** the number of current page */ $ 1ZY
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privateint currentPage; _: K\v8
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/** the begin index of the records by the current .YRSd
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query */ &EOh}O<
privateint beginIndex; k~ue^^r}
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/** The default constructor */ .bGeZwvf:G
public Page(){ 9iE66N>z
nabN.Ly
} *gn*S3Is[j
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/** construct the page by everyPage 7Go!W(8
* @param everyPage lLhCk>a
* */ [6|vx},N
public Page(int everyPage){ Up&q#vqIj
this.everyPage = everyPage; iJBZnU:Mp
} :y)'qv[
cx|j
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/** The whole constructor */ XvdhPOMy
public Page(boolean hasPrePage, boolean hasNextPage, $((<le5-)
U VT8TN-T
L;"<8\vWB
int everyPage, int totalPage, BlUY9`VWh@
int currentPage, int beginIndex){ ]Gr'Bt /
this.hasPrePage = hasPrePage; r!S iR(
this.hasNextPage = hasNextPage; *u}):8=&R
this.everyPage = everyPage; C6n4OU
this.totalPage = totalPage; CS/-:>s%
this.currentPage = currentPage; ZeO>Ag^
this.beginIndex = beginIndex; hk
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} ;IT^SHym
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/** JI&>w-~D
* @return KJd;c.
* Returns the beginIndex. pGIeW}2'9
*/ -n9e-0
publicint getBeginIndex(){ VV
return beginIndex; [Z0e$
} NQG"}=KA
g@Zc'g/XB
/** b Y>Ug{O;
* @param beginIndex `Ao:}
* The beginIndex to set. YblRwic
*/ UZ1lI>
publicvoid setBeginIndex(int beginIndex){ L8W3Tpi&(
this.beginIndex = beginIndex; W{0:8_EI
} =9c24j
Lg^m?~{
/** #xc[)Y,W
* @return =4zsAa
* Returns the currentPage. 7-5q\[ZK
*/ {t7
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publicint getCurrentPage(){ G>,rf
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return currentPage; 8.,PgS
} R9W(MLe58
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/** Rww KPE
* @param currentPage /EC m
* The currentPage to set. K)qmJ-Gub
*/ O7.Is88!
publicvoid setCurrentPage(int currentPage){ IQM!dC
this.currentPage = currentPage; 68y.yX[
} ESs)|t h
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/** |!}$V
* @return 1t)6wk
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* Returns the everyPage. '.iUv#j4Sh
*/ MT9a 1 >
publicint getEveryPage(){ v}!,4,]:&
return everyPage; u4S3NLG)
} `jV0;sPd;
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/** D\k);BU~
* @param everyPage #*9*[Xbi
* The everyPage to set. /
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*/ 9Dpmp|
publicvoid setEveryPage(int everyPage){ 9Kqr9U--v
this.everyPage = everyPage; =Xp3UNXg
} U'\\(m|
8^^al!0K~
/** nK:39D$(
* @return 04(h!@!g:
* Returns the hasNextPage. b*bR<|dT j
*/ Yux7kD\c
publicboolean getHasNextPage(){ l/TH"z(
return hasNextPage; f6m^pbQFl
}
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/** jReI+
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* @param hasNextPage LJBoS]~
* The hasNextPage to set. 7Fq|Zc`P
*/ {!-w|&bF
publicvoid setHasNextPage(boolean hasNextPage){ v.\&gn