Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 k{bba=<
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Va 5U`0
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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 b]Y,& 8}[+
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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 v[|iuOU
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分页支持类: HIU@m<
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java代码: vn_avYwiy
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package com.javaeye.common.util; )b7mzDp(
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import java.util.List; )} #r"!
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publicclass PaginationSupport { ZRHTvxf
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publicfinalstaticint PAGESIZE = 30; j;y|Ys)I
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privateint pageSize = PAGESIZE; ES~]rPVS
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privateList items; 5a`}DTB[Co
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privateint totalCount; +?<jSmGW
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privateint[] indexes = newint[0]; QXz!1o+"
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privateint startIndex = 0; h>/ViB@"W|
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public PaginationSupport(List items, int 8tL61x{]
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totalCount){ 9VByFQgM
setPageSize(PAGESIZE); +{I\r|
setTotalCount(totalCount); 3u^TJt)
setItems(items); ayD\b6Z2.
setStartIndex(0); [GuDMl3hC
} \f
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public PaginationSupport(List items, int Dpd$&Wr0Y
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totalCount, int startIndex){ cTnbI4S;
setPageSize(PAGESIZE); vy#(|[pL{
setTotalCount(totalCount); f+6l0@K2
setItems(items); GCKl[<9*
setStartIndex(startIndex); uS'ji
k}
} %)D7Dr
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public PaginationSupport(List items, int =gIYa
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totalCount, int pageSize, int startIndex){ w(j9[
setPageSize(pageSize); xD=D *W
setTotalCount(totalCount); h[]N=X
setItems(items); *LRGfk+h
setStartIndex(startIndex); ^sKXn:)
} MUrY >FYgx
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publicList getItems(){ IMZKlU3
return items; 'dzp@-\
} 07|NPS
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publicvoid setItems(List items){ ~30Wb9eL
this.items = items; WFd2_oAT
} I/aAx.q
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publicint getPageSize(){ rieQ&Jt"
return pageSize; ?N
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} aK{\8L3]
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publicvoid setPageSize(int pageSize){ +joE
this.pageSize = pageSize; 1Tq$ E[
} &EPEpN
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publicint getTotalCount(){ dx}/#jMa
return totalCount; mz*z1`\7v\
} X$9QW3.M
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publicvoid setTotalCount(int totalCount){ r!^\Q7
if(totalCount > 0){ }dUC^04
this.totalCount = totalCount; i!3K G|V
int count = totalCount / _kHpM :;.
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pageSize; )^N8L<
if(totalCount % pageSize > 0) ,[\(U!Z7:%
count++; tZ^;{sM
indexes = newint[count]; aA`q!s.%A
for(int i = 0; i < count; i++){ hD1AK+y
indexes = pageSize * Wts{tb
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i; (J&Xo.<Z-
} mM*yv
}else{ _,FoXf7
this.totalCount = 0; 0JNOFX
} Nr9[Vz?$P
} !&O/7ywe
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publicint[] getIndexes(){ 1H=wl=K
return indexes; e@=[+iJc
} 7omGg~!k(
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publicvoid setIndexes(int[] indexes){ Iv72;ZCh?6
this.indexes = indexes; ]7kGHIJ|
} s ;s-6%p
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publicint getStartIndex(){ e6HlOGPVQH
return startIndex; 1fW4=pF-K
} Rr 4CcM
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publicvoid setStartIndex(int startIndex){ |OZ>/l {
if(totalCount <= 0) O'-Zn]@.]
this.startIndex = 0; S7ehk*`
elseif(startIndex >= totalCount) S}^s5ztm
this.startIndex = indexes I~LQ1_
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[indexes.length - 1]; }Tr83B|
elseif(startIndex < 0) .k`*$1?73x
this.startIndex = 0; s2?,' es
else{ }c4E 2c
this.startIndex = indexes : .o=F`W
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[startIndex / pageSize]; ;"Y;l=9_
} hlFU"u_
} qTHg[sME
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publicint getNextIndex(){ -ouJf}#R
int nextIndex = getStartIndex() + kgI=0W>
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pageSize; n,jE#Z.D
if(nextIndex >= totalCount) f=_?<I{
return getStartIndex(); IHbo w0'
else ~hz@9E]O
return nextIndex; 7e4tUAiuU
} e4qk>Cw
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publicint getPreviousIndex(){ 5Vnr"d
int previousIndex = getStartIndex() - (U'7Fc
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pageSize; K-5"#
if(previousIndex < 0) y-<PsP-I
return0; B:- KZuO
else <]Pix)
return previousIndex; O\?5#.
} ;}eEG{`Y
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} ro&Y7m
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抽象业务类 [> &+*c
java代码: ?X_0Iy}1
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/** h w ;d m
* Created on 2005-7-12 *T>#zR{
*/ =!S@tuY
package com.javaeye.common.business; ADyNNMcx
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import java.io.Serializable; !v5sWVVR
import java.util.List; eW"x%|/Q7
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import org.hibernate.Criteria; vQBY1-S
import org.hibernate.HibernateException; b*FU*)<4.
import org.hibernate.Session; +wz`_i)!
import org.hibernate.criterion.DetachedCriteria; [Yx-l;78
import org.hibernate.criterion.Projections; /R(U>pZ
import p*AP 'cR
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org.springframework.orm.hibernate3.HibernateCallback; @8M'<tr<z
import G{:af:5Fo
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org.springframework.orm.hibernate3.support.HibernateDaoS zfjD b
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upport; h2/dhp
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import com.javaeye.common.util.PaginationSupport; .}$`+h8WT
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public abstract class AbstractManager extends 1(:b{Bl
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HibernateDaoSupport { @dE 3
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privateboolean cacheQueries = false; r\l3_t
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privateString queryCacheRegion; Pa+AF
#"o6OEy$A#
publicvoid setCacheQueries(boolean gQI(=in
} Jdh^t .
cacheQueries){ f0cYvL]
this.cacheQueries = cacheQueries; Lt;.Nw
} n~"g'Y
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publicvoid setQueryCacheRegion(String u,Q_WR-wJ
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queryCacheRegion){ aR="5{en{:
this.queryCacheRegion = {hs2?#p
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queryCacheRegion; (5Z8zNH`3
} 8g#
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publicvoid save(finalObject entity){ V(lK`dY
getHibernateTemplate().save(entity); -~(0O
} gfdPx:7^
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publicvoid persist(finalObject entity){ [Q7->Wo|S:
getHibernateTemplate().save(entity); c]%;^)
} @o4z3Q@
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publicvoid update(finalObject entity){ -+
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getHibernateTemplate().update(entity); _ bXVg3oDt
} uGuc._}=
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publicvoid delete(finalObject entity){ {*M>X}voS
getHibernateTemplate().delete(entity); 1kvPiV=X>
} dt-Qu},8-
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publicObject load(finalClass entity, 4hsPbUx9
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finalSerializable id){ .^[fG59
return getHibernateTemplate().load 8CP9DS
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(entity, id); ]b0zkoD9<
} =RW*
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publicObject get(finalClass entity,
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finalSerializable id){ @MN}^umx`
return getHibernateTemplate().get ;e#>n!<u
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(entity, id); u=d`j
} vCy.CN$
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publicList findAll(finalClass entity){ 1V*8,YiC<
return getHibernateTemplate().find("from m6bWmGnGC
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" + entity.getName()); ;_?zB NW
} P;)2*:--)
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publicList findByNamedQuery(finalString ]97Xu_
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namedQuery){ i63`B+L{
return getHibernateTemplate 9_J!s
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().findByNamedQuery(namedQuery); q;~R:}?@
} bGGeg%7
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publicList findByNamedQuery(finalString query, ql!5m\
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finalObject parameter){ '\ph`Run
return getHibernateTemplate 8_^'(]
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().findByNamedQuery(query, parameter); $:%*gY4~76
} 5z9r S<
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publicList findByNamedQuery(finalString query, ^Ei*M0fF
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finalObject[] parameters){ cwH,l$
return getHibernateTemplate ,X9hl J
th.M.jas
().findByNamedQuery(query, parameters); k1^V?O
} R7E]*:0}
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publicList find(finalString query){ f0-RhR
return getHibernateTemplate().find &q," !:L]
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(query); ;el]LnV!O
} uuI3NAi~
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publicList find(finalString query, finalObject w;N{>)hv
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parameter){ +}Kk2Kg8
return getHibernateTemplate().find E0sbU<11
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(query, parameter); +G5'kYzJ
} W@:^aH
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public PaginationSupport findPageByCriteria oS[W*\7'!
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(final DetachedCriteria detachedCriteria){ =1gDjF9|
return findPageByCriteria ^K7q<X ,
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); /- DKV~
} C#A@)>
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public PaginationSupport findPageByCriteria '4J&Gp x
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(final DetachedCriteria detachedCriteria, finalint mBw2
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startIndex){ \1=T
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return findPageByCriteria rER~P\-
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(detachedCriteria, PaginationSupport.PAGESIZE, k
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startIndex); pO\S#GnX
} re7!p(W?,
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public PaginationSupport findPageByCriteria zSEr4^Dk4
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(final DetachedCriteria detachedCriteria, finalint YH6snC$u
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pageSize, Q<z)q<e
finalint startIndex){ *
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return(PaginationSupport) a^@+%?X
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getHibernateTemplate().execute(new HibernateCallback(){ MNkKy(Za
publicObject doInHibernate '"Bex`
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(Session session)throws HibernateException {
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Criteria criteria = PqTYAN&F
'g. :MQ8
detachedCriteria.getExecutableCriteria(session); '*8
int totalCount = ,yTN$K%M
{\P?/U6~f
((Integer) criteria.setProjection(Projections.rowCount w+Ad$4Pf"
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()).uniqueResult()).intValue(); -s{R/ 6:
criteria.setProjection [Dnusp7e
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(null); aLV~|$:2
List items = cB{%u
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criteria.setFirstResult(startIndex).setMaxResults 4DvdEt
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(pageSize).list(); G?>qd}]y0L
PaginationSupport ps = K3Huu!Tr
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new PaginationSupport(items, totalCount, pageSize, 1Pu
, :Jt
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startIndex); OdO{xG G@
return ps; 4"LPJX)Q
} baqn7k"
}, true); N[>:@h
} "_t4F4z
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public List findAllByCriteria(final /#29Y^Z)=
@v"T~6M
DetachedCriteria detachedCriteria){ H1Q''$}Z.
return(List) getHibernateTemplate \{kHSV%z
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().execute(new HibernateCallback(){ b7Yq_%+
publicObject doInHibernate %cS#+aK6M'
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(Session session)throws HibernateException { 6tX.(/+L
Criteria criteria = RTA%hCr!
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detachedCriteria.getExecutableCriteria(session); AD(xaQ&T
return criteria.list(); e,^pMg~
} }Bd_:#.mw
}, true); 6{L F-`S%
} V!mWn|lf
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public int getCountByCriteria(final S45'j(S=
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DetachedCriteria detachedCriteria){ Ks|gL#)*Ku
Integer count = (Integer) /\~l1.6`
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getHibernateTemplate().execute(new HibernateCallback(){ n>n"{!
publicObject doInHibernate EVWA\RO'\
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(Session session)throws HibernateException { g/x_m.
Criteria criteria = 2mQOj$Lv
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detachedCriteria.getExecutableCriteria(session); U8E0~[y'
return *jGPGnSo
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criteria.setProjection(Projections.rowCount " l.!Ed
f7.m=lbe
()).uniqueResult(); {JTmP `&l
} >)4.$#H
}, true); Il|GCj*N
return count.intValue(); ^[0"vtb
} "8FSA`>=
} }N@n{bu+
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用户在web层构造查询条件detachedCriteria,和可选的 |"_ )zQ
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 >n(F4C-pl
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PaginationSupport的实例ps。 t]4!{~,
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ps.getItems()得到已分页好的结果集 1}`2\3,
ps.getIndexes()得到分页索引的数组 rJX\6{V!_
ps.getTotalCount()得到总结果数 !F-sA: xq
ps.getStartIndex()当前分页索引 lz-
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ps.getNextIndex()下一页索引 s88y{o
ps.getPreviousIndex()上一页索引 2g0K76=Co:
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 8+&gp$a$
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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 gXF.on4B
/ xs9.w8-
一下代码重构了。 7pz\ScSe
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我把原本我的做法也提供出来供大家讨论吧: K0LbZMn,/
:4U0I:J#
首先,为了实现分页查询,我封装了一个Page类: 2?*||c==*
java代码: X'jr|s^s
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/*Created on 2005-4-14*/ ?@>;/@
package org.flyware.util.page; :1*zr
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/** xvdY
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* @author Joa 8sH50jeP
* B O]=vH
*/ v"/TmiZ
publicclass Page { ZOC#i i`:
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/** imply if the page has previous page */ QTfu: m{
privateboolean hasPrePage;
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/** imply if the page has next page */ %Sul4: D#
privateboolean hasNextPage; Nkx0CG*
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/** the number of every page */ _Yy:s2I8B
privateint everyPage; [t$4Tdd
,&[7u9@
/** the total page number */ VE*j*U
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privateint totalPage; _!%M%
*Er? C;
/** the number of current page */ (2d3jQN`
privateint currentPage; Hxn<(gd
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/** the begin index of the records by the current }f]b't
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query */ \@8*T S
privateint beginIndex; ?d~]Wd !z
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/** The default constructor */ 5tMh/]IeS
public Page(){ $HxS:3D%D
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} GY9y9HNZ
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/** construct the page by everyPage i+1Qf
* @param everyPage .>wFztK
* */ b[yE~EQxr
public Page(int everyPage){ `\ R{5TU
this.everyPage = everyPage; KxX[S.C
} !VFem~'d
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/** The whole constructor */ d+Ds9(gV
public Page(boolean hasPrePage, boolean hasNextPage, R3Ee%0QK
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int everyPage, int totalPage, 6{8/P'@/Zz
int currentPage, int beginIndex){ >J@egIKzP
this.hasPrePage = hasPrePage; 05"qi6tncz
this.hasNextPage = hasNextPage; g}m+f]|
this.everyPage = everyPage; VyY.r#@
this.totalPage = totalPage; hF.6}28U1
this.currentPage = currentPage; 8""mp]o9
this.beginIndex = beginIndex; !!*;4FK"q
} guE2THnz3D
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/** iE=P'"I
* @return #52NsVaT@
* Returns the beginIndex. |by@ :@*y
*/ /p 5=i
publicint getBeginIndex(){ vf N#NY6
return beginIndex; M%|f+u &
} p/3BD&6
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/** d/lffNS=
* @param beginIndex aHC%19UN
* The beginIndex to set. 9T?64t<Ju
*/ 5uttv:@=
publicvoid setBeginIndex(int beginIndex){ 'bPk'pj9
this.beginIndex = beginIndex; wFb@1ae\
} =hGJAU
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/** Y&g&n o_
* @return drIK(u\_
* Returns the currentPage. l2s{~ IC
*/ pC^2Rzf
publicint getCurrentPage(){ ssA7Dx:
return currentPage; l])Q.m
} n/ AW?'
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/** rREzM)GA
* @param currentPage 7*;^UqGjz
* The currentPage to set. C\A49q
*/ ,T{oy:rB
publicvoid setCurrentPage(int currentPage){ a,cC!
this.currentPage = currentPage; EHhd;,;O
} sUbFRq
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/** 2( _=SfQ
* @return ;`X~ k|7K
* Returns the everyPage. YZ**;"<G
*/ u7#z^r
publicint getEveryPage(){ 3~<}bee5|q
return everyPage; i.M2E$b|
} GI_DhU]~)
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/** ?+\E3}:
* @param everyPage ($SLb6
* The everyPage to set. { *$9,
*/ i-.c=M
publicvoid setEveryPage(int everyPage){ N~| t!G*9
this.everyPage = everyPage; n_9x"m$
} 6c &Y
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/** (bvoF5%
* @return nB&j
* Returns the hasNextPage. R04J3D|
*/ > 0T
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publicboolean getHasNextPage(){ SX_4=^
return hasNextPage; @RVOXkVo
} Q6x%
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/** CKd3w8;
* @param hasNextPage t!~S9c
* The hasNextPage to set. + Kk@Q
*/ u|OtKq
publicvoid setHasNextPage(boolean hasNextPage){ :1MMa6
this.hasNextPage = hasNextPage; ^mf jn-=3
} <[<247%
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/**
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* @return 7=3O^=Q^Q
* Returns the hasPrePage. hy!6g n
*/ ?(D}5`Nfu
publicboolean getHasPrePage(){ */_@a?
return hasPrePage; Q7(eq0na
} CjKRP;5
m8AAp1=
/** $20s]ywS
* @param hasPrePage ~-<:+9m
* The hasPrePage to set. EY$?^iS
*/ DY.58IHg1
publicvoid setHasPrePage(boolean hasPrePage){ LM6]kll
this.hasPrePage = hasPrePage; eXG57<t ON
} 'hIU_
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/** *~;8N|4<
* @return Returns the totalPage. L$hc,
* Mpm#GdT
*/ ^*>n4U
publicint getTotalPage(){ I4~^TrznRa
return totalPage; zt?H~0$LB
} G=cNzr9
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/** @ef$b?wg
* @param totalPage RH~sbnZ)F
* The totalPage to set. b{pg!/N4
*/ Hg whe=P
publicvoid setTotalPage(int totalPage){ jb3.W
this.totalPage = totalPage; Spo+@G
} OL9]*G?F
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} F[]&