Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 !cLX1S
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 H!&]Di1Eh
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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 v|jBRKU99
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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 9p(s FQ
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。 /yIkHb^c
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分页支持类: 'oHtg
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java代码: > K,Q`sS
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package com.javaeye.common.util; !5 %c`4
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import java.util.List; p[&'*"o!/
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publicclass PaginationSupport { Y{@ez
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publicfinalstaticint PAGESIZE = 30; ~LHG
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privateint pageSize = PAGESIZE; ^MUtmzh
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privateList items; gOO\` #
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privateint totalCount; b}o^ ?NtA
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privateint[] indexes = newint[0]; 1d|+7
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privateint startIndex = 0; iO3@2J
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public PaginationSupport(List items, int j$zw(EkN
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totalCount){ vhZpYW8
setPageSize(PAGESIZE); d/- f]
setTotalCount(totalCount); O} QTg
setItems(items); +=Crfvt
setStartIndex(0); ,/|"0$p2x
} Q9X_aB0
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public PaginationSupport(List items, int sBq @W4
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totalCount, int startIndex){ <"AP&J'H
setPageSize(PAGESIZE); J^ryUOo}b
setTotalCount(totalCount); 4'?kyTO~
setItems(items); Fc7mAV=
setStartIndex(startIndex); pb}QP
} e!ar:>T
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public PaginationSupport(List items, int Yc /rjEn7O
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totalCount, int pageSize, int startIndex){ a~7`;Ar
setPageSize(pageSize); U9IN# ;W
setTotalCount(totalCount); Gu|}ax"
setItems(items); me$7\B;wy
setStartIndex(startIndex); :^1 Xfc"
} jUZ84Gm{
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publicList getItems(){ RXb+"/
return items; L=VJl[DL
} M2[;b+W9
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publicvoid setItems(List items){ ,F.\ z^\{
this.items = items; $=TFTSO
} )O"5dF1l
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publicint getPageSize(){ /{d7%Et6
return pageSize; fZ]Y
} H{E223
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publicvoid setPageSize(int pageSize){ 7$a,pNDw
this.pageSize = pageSize; 65\'(99yU
} %w=*4!NWb
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publicint getTotalCount(){ 7<mY{!2iF?
return totalCount; h:<pEL
} !BP/#
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publicvoid setTotalCount(int totalCount){ Aj;Z
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if(totalCount > 0){ !TVlsm
this.totalCount = totalCount; F# y5T3(P
int count = totalCount / M8ZpNa
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pageSize; 9h<];
if(totalCount % pageSize > 0) fl!8 \4
count++; g[0b>r7
indexes = newint[count]; ib0M$Y1tIS
for(int i = 0; i < count; i++){ -{>JF
indexes = pageSize * u=5&e)v3
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} [:
}else{ i!LEA/"V
this.totalCount = 0; 5yI_uQR
} 4)!aYvaER
} :,Q\!s!
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publicint[] getIndexes(){ {k%*j 4
return indexes; ']4b}F:}
} ^J< I
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publicvoid setIndexes(int[] indexes){ )AEJ`xC
this.indexes = indexes; x?9rT 0D
} <3m_}
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publicint getStartIndex(){ %# ?)+8"l
return startIndex; D kl4^}
} JQj?+PI
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publicvoid setStartIndex(int startIndex){ |77.Lqqy,
if(totalCount <= 0) B<u6Z!Pp2
this.startIndex = 0; *8M0h9S$
elseif(startIndex >= totalCount) <kN4@bd;
this.startIndex = indexes / Of*II&
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[indexes.length - 1]; +)h *)
elseif(startIndex < 0) __fa,kK {?
this.startIndex = 0; ]+<[D2f
else{ R?b3G4~
this.startIndex = indexes 1N{}G$'Go
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[startIndex / pageSize]; lE=(6Q
} Q0K2md_%x
} N_rz~$|@9
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publicint getNextIndex(){ RZ-=UIf
int nextIndex = getStartIndex() + zc01\M
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pageSize; -~\R.<+
if(nextIndex >= totalCount) `w` f[dU-
return getStartIndex(); 7g8}]\i+
else v;AsV`g
return nextIndex; }:<`L\8q\
} 4$#nciAe
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publicint getPreviousIndex(){ i t.Lh'N;T
int previousIndex = getStartIndex() - E #q
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pageSize; 2$?bLvk
if(previousIndex < 0) ebK/cPa8
return0; OC34@YUj[
else |ZZl3l=]
return previousIndex; _&)^a)Nu
} NF8'O
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} vik A
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抽象业务类 +z}O*,M"q
java代码: *(wkgn
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/** yw2Mr+9I
* Created on 2005-7-12 $c"byQ[3S
*/ ]^j:}#R
package com.javaeye.common.business; wX5Yo{
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import java.io.Serializable; Bn:"qN~
import java.util.List; cCx@VT`0
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import org.hibernate.Criteria; H@ Yj
import org.hibernate.HibernateException; KmS$CFsGL
import org.hibernate.Session; [rk*4b ^s
import org.hibernate.criterion.DetachedCriteria; 8_byS<b8
import org.hibernate.criterion.Projections;
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import .TZ0FxW
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org.springframework.orm.hibernate3.HibernateCallback; _=0%3Sh
import )45~YDS;t
}
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org.springframework.orm.hibernate3.support.HibernateDaoS ?+Gc.lU
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upport; mV!Ia-k
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import com.javaeye.common.util.PaginationSupport; 6d~[j<@2
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public abstract class AbstractManager extends :&Sv jJR
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HibernateDaoSupport { VWhq+8z
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privateboolean cacheQueries = false; QAGR\~
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privateString queryCacheRegion; zplAH!s5''
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publicvoid setCacheQueries(boolean c{.y9P6
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cacheQueries){ ?e=3G4N
this.cacheQueries = cacheQueries; oF'_x,0
} pQ~Y7
@M( hyS&on
publicvoid setQueryCacheRegion(String s Zn@y e^
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queryCacheRegion){ 78M%[7Cq<i
this.queryCacheRegion = .X1xpi%
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queryCacheRegion; ]bcAbCZ@
} up _Qv#`Q
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publicvoid save(finalObject entity){ z`]sWi F0
getHibernateTemplate().save(entity); QC\r|RXW
} d23;c )'
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publicvoid persist(finalObject entity){ =Jyi9VN=&
getHibernateTemplate().save(entity); .)(5F45Wg
} (1%O;D.*?{
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publicvoid update(finalObject entity){ RnV#[bM{
getHibernateTemplate().update(entity); DP@F-Q4
} jJ.isr|`
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publicvoid delete(finalObject entity){ 7a0T]
getHibernateTemplate().delete(entity); c"*xw8|
} ]g] ]\hS
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publicObject load(finalClass entity, 3A&:
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finalSerializable id){ <@.!\
return getHibernateTemplate().load \u4`6EYF?
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(entity, id); pNFVa<D
} DhVO}g)2#
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publicObject get(finalClass entity, _ASyGmO{
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finalSerializable id){ 7&`Yl[G
return getHibernateTemplate().get c`Q#4e]%_
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(entity, id); R6cd;| fan
} Mq~ g+`
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publicList findAll(finalClass entity){ ,7:?Du}
return getHibernateTemplate().find("from F[q)ME+`)
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" + entity.getName()); *lo0T93B
} zp'Vn7
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publicList findByNamedQuery(finalString g:oB j6$
q
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namedQuery){ dDrzO*a\
return getHibernateTemplate q<XleC
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().findByNamedQuery(namedQuery); |S6L[Uo
} A u10]b
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publicList findByNamedQuery(finalString query,
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finalObject parameter){ mXwDB)O{)
return getHibernateTemplate r=gF&Og,?
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().findByNamedQuery(query, parameter); FZBdQhYF
} L#k`>Qn2
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publicList findByNamedQuery(finalString query, g0-~%A,
)NLjv=ql
finalObject[] parameters){ a7U`/*
return getHibernateTemplate bZ SaL^^(
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().findByNamedQuery(query, parameters); {Gvv^.H7
} IkP; i_|
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publicList find(finalString query){ y9U*E80q{
return getHibernateTemplate().find Ghf/IXq#
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(query); Y3.^a5o
} Uz_OUTFM
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publicList find(finalString query, finalObject $tqr+1P
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parameter){ #z#`EBXV$6
return getHibernateTemplate().find v"YaMbu
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(query, parameter); d3;Sy`.
} z1m-t#v:
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public PaginationSupport findPageByCriteria Mi<l;ZP
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(final DetachedCriteria detachedCriteria){ m)ENj6A>yP
return findPageByCriteria
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ^wlo;.8Y
} cqG&n0zb
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public PaginationSupport findPageByCriteria LEd@""h
@[v4[yq-
(final DetachedCriteria detachedCriteria, finalint *J3Z.fq%:i
%~I%*=o[
startIndex){ }B`T%(11=
return findPageByCriteria ms6dl-_t
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(detachedCriteria, PaginationSupport.PAGESIZE, $O^"OQ_@
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startIndex); U>hpYqf_
} z7!@^!r
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public PaginationSupport findPageByCriteria ],F@ .pg
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(final DetachedCriteria detachedCriteria, finalint si1Szmx,
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pageSize, | Zj=E$
finalint startIndex){ s x2\
return(PaginationSupport) a8 .x=j<
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getHibernateTemplate().execute(new HibernateCallback(){ =gAn;~
publicObject doInHibernate dmYgv^t
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(Session session)throws HibernateException { E`b<^l`
Criteria criteria = Ey&gZ$|&
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detachedCriteria.getExecutableCriteria(session); "?>hQM1R
int totalCount = om{aws;
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((Integer) criteria.setProjection(Projections.rowCount 9'0v]ar
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()).uniqueResult()).intValue(); UIo jXR<
criteria.setProjection YhO-ecN
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(null); MI,kKi
List items = F.iJz4ya_
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criteria.setFirstResult(startIndex).setMaxResults 4Un%p7Y~
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(pageSize).list(); Z$y~:bz
PaginationSupport ps = tY- `$U@
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new PaginationSupport(items, totalCount, pageSize, &Fh#o t H_
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startIndex); {YIf rM
return ps; 2h#_n'DV
} 5GwzG<.\^_
}, true); /TScYE:$HE
} ^]TYS]C
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public List findAllByCriteria(final ~m&q@ms&
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DetachedCriteria detachedCriteria){ 64l(ru<
return(List) getHibernateTemplate ;uaZp.<um&
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().execute(new HibernateCallback(){ 4||dc}I"E
publicObject doInHibernate 6]fz;\DgP
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(Session session)throws HibernateException { g_e_L39
Criteria criteria = DS^`:^hv
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detachedCriteria.getExecutableCriteria(session); mI,!8#
return criteria.list(); :xZ^Jq91
} z K6'wL!!I
}, true); QygbfW6u
} ~#|Pe1Y
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public int getCountByCriteria(final THmmf_w@
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DetachedCriteria detachedCriteria){ 94xWMX2
Integer count = (Integer) ]SG(YrF
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getHibernateTemplate().execute(new HibernateCallback(){ HB9|AQ4K
publicObject doInHibernate ~JTp8E9kw
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(Session session)throws HibernateException { 5^C.}/#>F
Criteria criteria = Yl"l|2
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detachedCriteria.getExecutableCriteria(session); ;fZ9:WB
return p~17cH4~-f
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criteria.setProjection(Projections.rowCount d7qYz7=d
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()).uniqueResult(); ~ ":}Rs
} %Iv*u sXP
}, true); ~c${?uf
return count.intValue(); {J]x81}*;
} !c;BOCqa
} M1J77LfS8
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用户在web层构造查询条件detachedCriteria,和可选的 vu`,:/|h
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 r;8X6C
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PaginationSupport的实例ps。 $kd9^lj#[
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ps.getItems()得到已分页好的结果集 (!0fmL
ps.getIndexes()得到分页索引的数组 ,g:\8*Y>'
ps.getTotalCount()得到总结果数 8"C[sRhz
ps.getStartIndex()当前分页索引 #pr{tL
ps.getNextIndex()下一页索引 y\zRv(T=
ps.getPreviousIndex()上一页索引 -gVsOX0
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 OtZc;c
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 PiF &0;
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一下代码重构了。 UzT"Rb:e
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我把原本我的做法也提供出来供大家讨论吧: N~+ e\K6
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首先,为了实现分页查询,我封装了一个Page类: 10{zF_9yx
java代码: )=%TIkeF
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/*Created on 2005-4-14*/ Q<T+t0G\O-
package org.flyware.util.page; `}S;_g!
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/** wAF<_NG#
* @author Joa WnL7 A:sZ
* uO5y{O2W
*/ l'twy$V4|~
publicclass Page { f8S! FGiNc
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/** imply if the page has previous page */ +{au$v}
privateboolean hasPrePage; VRD:PVz
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/** imply if the page has next page */ '|@?R |i0
privateboolean hasNextPage; $$e"[g
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/** the number of every page */ M6XpauR-
privateint everyPage; \`Ow)t:
T':} p2}w+
/** the total page number */ !U4<4<+
privateint totalPage; jP}Ix8vc=
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/** the number of current page */ }fh<L CwTi
privateint currentPage; q6EZ?bo{
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/** the begin index of the records by the current 1fqJtP6
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query */ )6*)u/x:
privateint beginIndex; 'J_`CS
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/** The default constructor */ &NH[b1NMr
public Page(){ u#nM_UJe
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} /Suh&qw>
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/** construct the page by everyPage ,vB~9^~
* @param everyPage Jsf"h-)P
* */ d[`vd^hI
public Page(int everyPage){ _*fOn@Vwo
this.everyPage = everyPage; $LW8 vo7
} I6Ga'5bV
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/** The whole constructor */ q!AcMd\
public Page(boolean hasPrePage, boolean hasNextPage, p mUG`8SY
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int everyPage, int totalPage, Ni>!b6Z`[
int currentPage, int beginIndex){ w@x||K= Z
this.hasPrePage = hasPrePage; v,d'SR.
this.hasNextPage = hasNextPage; /wU4^8Hz
this.everyPage = everyPage; M`p[ Zq
this.totalPage = totalPage; 0SV4p.
this.currentPage = currentPage; "P a y2
this.beginIndex = beginIndex; b=XXp`h~a
} qaG8:
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/** gN.n_!
* @return c'
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* Returns the beginIndex. om2)Cd9~7
*/ tL]T_]z
publicint getBeginIndex(){ d~#:t~
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return beginIndex; ;k
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} @ RP?)*8}&
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/** 22@w:
* @param beginIndex n;e.N:p
* The beginIndex to set. sFw;P`
*/ g17 fge6%
publicvoid setBeginIndex(int beginIndex){ a/xnf<(H
this.beginIndex = beginIndex; }U@(S>,%
} 9k;%R5(
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/** w+gPU1|(r
* @return KJ
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* Returns the currentPage. FD/=uIXH2
*/ @ \*Zq
publicint getCurrentPage(){ I lZ$Jd
return currentPage; YI?tmqzt
} 6#kmV
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/** 5DL(#9F8b9
* @param currentPage .* &F
* The currentPage to set. rmeGk&*R8
*/ v9"03=h
publicvoid setCurrentPage(int currentPage){ +LF`ZXe8l
this.currentPage = currentPage; @T%8EiV
} B-h@\y
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/** ny1Dg$ui2
* @return ]h'*L`
* Returns the everyPage. @3`Pq2<
*/ gWfMUl
publicint getEveryPage(){ pkc*toW
return everyPage; g`dAj4B
} W1ql[DqE{
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/** H18pVh
* @param everyPage t**MthnW
* The everyPage to set. 5%"sv+iO
*/ %ZX3:2
publicvoid setEveryPage(int everyPage){ Ge1"+:tbJ
this.everyPage = everyPage; ~cSE 9ul
} AbIYdFX B
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/** A8
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