Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 z"P,=M6De
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Ow .)h(y/
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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 (J;zk b
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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 WNlSve)]ie
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分页支持类: @ !O&b%8X%
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java代码: )hZ}$P1
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package com.javaeye.common.util; VOF:+o@.
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import java.util.List; (!&O4C5
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publicclass PaginationSupport { YT%SCaU
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publicfinalstaticint PAGESIZE = 30; <+1w'-
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privateint pageSize = PAGESIZE; q$2taG}
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privateList items; H1ui#5n2
d# ?*62
privateint totalCount; F]&J%i
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privateint[] indexes = newint[0]; <~8f0+"
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privateint startIndex = 0; #uw*8&%0
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public PaginationSupport(List items, int =smY/q^3
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totalCount){ D~ `YRbv
setPageSize(PAGESIZE); 6;c{~$s~[
setTotalCount(totalCount); }d*sWSPu(
setItems(items); *[5#g3
setStartIndex(0); 2Lu{@*
} xg1r 3
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public PaginationSupport(List items, int w.F3o4YP
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totalCount, int startIndex){ Yw1q2jT
setPageSize(PAGESIZE); Bma|!p{
setTotalCount(totalCount); &i}cC4i
setItems(items); B>nd9Z '
setStartIndex(startIndex); cXEy>U|/
} (L
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public PaginationSupport(List items, int ,`2xfVa-
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totalCount, int pageSize, int startIndex){ ;8xn"G0}a
setPageSize(pageSize); `DY4d$!4
setTotalCount(totalCount); 3&d+U)E
setItems(items); F^v{ Jqc
setStartIndex(startIndex); eOmxA<h
} ; 8x^9Q
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publicList getItems(){ D)eKq!_
return items; ?lna8]t
} 2{tJ'3
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publicvoid setItems(List items){ dz.MH
this.items = items; 9-<V%eNX
} [0
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publicint getPageSize(){ bL#TR;*]
return pageSize; fOfz^W
} NP(?[W
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publicvoid setPageSize(int pageSize){ :[?o7%"
this.pageSize = pageSize; 'GO..m"G
} ,O`*AzjS5Q
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publicint getTotalCount(){ rca"q[,
return totalCount; F(n))`(
} ",@g
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publicvoid setTotalCount(int totalCount){ 39m"}26*E
if(totalCount > 0){ Z#V\[
this.totalCount = totalCount; ng6p#F,3
int count = totalCount / X)+sHcE~#
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pageSize; PvCE}bY{}
if(totalCount % pageSize > 0) v2z/|sG
count++; )bg,rESM
indexes = newint[count]; KT?s\w
for(int i = 0; i < count; i++){ x%7x^]$
indexes = pageSize * kqB00
;
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} '0]_8Sy&
}else{ Hx0,kOh)
this.totalCount = 0; 4T^WRS
} No|{rYYKK
} 3CRBu:)m
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publicint[] getIndexes(){ cO+`8`kv
return indexes; 74OM tLL$
} e;3 (,
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publicvoid setIndexes(int[] indexes){ PKG
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this.indexes = indexes; hiM!htc;M
} h--!pE+
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publicint getStartIndex(){ gJv^v`X
return startIndex; )ciHY6
} pLcng[
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publicvoid setStartIndex(int startIndex){ #-,`4x$m|
if(totalCount <= 0) $B/cj^3
this.startIndex = 0; e28#Yh@U
elseif(startIndex >= totalCount) RuuU}XQ
this.startIndex = indexes p7tC~]r:L
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[indexes.length - 1]; $ wB
elseif(startIndex < 0) 6&T1
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this.startIndex = 0; "MN'%"/
else{ >,2],X"G
this.startIndex = indexes m"}G-#
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[startIndex / pageSize]; @vh>GiR){
} (8R
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} /_(Dq8^g@
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publicint getNextIndex(){ y70gNPuTOD
int nextIndex = getStartIndex() + tB7aHZ|
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pageSize; Br??Gdd
if(nextIndex >= totalCount) SQk!o{
return getStartIndex(); ]x\wP7x
else d(XWt;K K
return nextIndex; 1OL~)X3
} VG^-aR_F
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publicint getPreviousIndex(){ uI wyan-
int previousIndex = getStartIndex() - i9"1
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pageSize; y_#wR/E)u{
if(previousIndex < 0) df\>-Hl
return0; 9tQk/niMM5
else jL1UPN
return previousIndex; eu;^h3u;b
} Q4*cL5j
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} p(>'4#|qy
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抽象业务类 Nh%8;
java代码: q[ZYlF,Ho
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/** Hua8/:![+
* Created on 2005-7-12 E~Nr4vq
*/ g!uhy}
package com.javaeye.common.business; 6qf`P!7d]M
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import java.io.Serializable; uy~j$ lrn
import java.util.List; v\C+G[MV7
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import org.hibernate.Criteria; b"b!&u
import org.hibernate.HibernateException; S]m[$)U%@
import org.hibernate.Session; ~Ua0pS?
import org.hibernate.criterion.DetachedCriteria; ?9"glzxr
import org.hibernate.criterion.Projections; 7Jk.U=vY
import {`> x"Y5
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org.springframework.orm.hibernate3.HibernateCallback; S;~_9i]upe
import Jt"Wtr
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org.springframework.orm.hibernate3.support.HibernateDaoS P+a&R<Dj4
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upport; zZ63
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import com.javaeye.common.util.PaginationSupport; "cx" d:
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public abstract class AbstractManager extends HZNX1aQ|Q#
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HibernateDaoSupport { !O*n6}nPE
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privateboolean cacheQueries = false; QHK$
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privateString queryCacheRegion; \JchcQ
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publicvoid setCacheQueries(boolean (TPD!=
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cacheQueries){ n)yqb
this.cacheQueries = cacheQueries; ,ic}
} 7VraWW`H'
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publicvoid setQueryCacheRegion(String `XQ5> c
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queryCacheRegion){ Lfor0-j
this.queryCacheRegion = 4|qp&%9-
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queryCacheRegion; {#MViBhd%
} |Cm}%sgR\0
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publicvoid save(finalObject entity){ %{Gqhb=u\
getHibernateTemplate().save(entity); 5"+* c@L
} i~4Kek6,I
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publicvoid persist(finalObject entity){ !?96P|G
getHibernateTemplate().save(entity); @47TDCr
} 7">.{
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publicvoid update(finalObject entity){ Dqki}k~{
getHibernateTemplate().update(entity); QnqX/vnR
} ,=FYf|Z
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publicvoid delete(finalObject entity){ H={,zZ11{
getHibernateTemplate().delete(entity); r?$\`,;
} &nq[Vy0kO4
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publicObject load(finalClass entity, kDrGl{U}
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finalSerializable id){ LxbVRw
return getHibernateTemplate().load (/^&3xs9
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(entity, id); m~v
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} EpiagCS
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publicObject get(finalClass entity, x/ez=yd*l
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finalSerializable id){ +{s^"M2`
return getHibernateTemplate().get aaBBI S
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(entity, id); C9fJLCufC
} -`( :L[
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publicList findAll(finalClass entity){ Rj8l]m6U9
return getHibernateTemplate().find("from uzS57 O%
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" + entity.getName()); eK`tFs,u
} = #`FXO1C
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publicList findByNamedQuery(finalString ',.Xn`c
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namedQuery){ .]"
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return getHibernateTemplate
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().findByNamedQuery(namedQuery); !"wIb.j}0
} zw0p}
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publicList findByNamedQuery(finalString query, Xd4~N:
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finalObject parameter){ ALG +
return getHibernateTemplate }"szL=s
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().findByNamedQuery(query, parameter); 35ng_,t$
} _|F h^hq
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publicList findByNamedQuery(finalString query, ^Tl|v'
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finalObject[] parameters){ KMZ% 1=a
return getHibernateTemplate -v]7}[
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().findByNamedQuery(query, parameters); :5dq<>~
} J[^-k!9M
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publicList find(finalString query){ v"^G9u
return getHibernateTemplate().find <h^vl-L>
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(query); ~; MRQE
} *@D.=i>
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publicList find(finalString query, finalObject 4kIy4x'*
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parameter){ O)&V}hU*
return getHibernateTemplate().find 0Rj_l:d=
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(query, parameter); 0(]C$*~mk
} w'}b 8m(L
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public PaginationSupport findPageByCriteria tY VmB:l
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(final DetachedCriteria detachedCriteria){ @xmL?wz
return findPageByCriteria qg|SBQ?6
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); -2f_e3jF
} M4`qi3I
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public PaginationSupport findPageByCriteria x2l~aw#?
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(final DetachedCriteria detachedCriteria, finalint ,|D<De\v&
@?TOg{:
startIndex){ {ymD.vf=9+
return findPageByCriteria K;Fy&p^d
L )kwMk
(detachedCriteria, PaginationSupport.PAGESIZE, :GK]"sNC
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startIndex); l1nrJm8
} JT!-Q!O}O
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public PaginationSupport findPageByCriteria sZ_+6+ :
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(final DetachedCriteria detachedCriteria, finalint |pA3ZWm
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pageSize, |BN^5mqP6
finalint startIndex){ p4[cPt ~C
return(PaginationSupport) Kx7s
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getHibernateTemplate().execute(new HibernateCallback(){ it \3-
publicObject doInHibernate oUoDj'JN{
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(Session session)throws HibernateException { HZKqGkE
Criteria criteria = ogtl
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detachedCriteria.getExecutableCriteria(session); t
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int totalCount = %d3qMnYu
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((Integer) criteria.setProjection(Projections.rowCount 3,t3\`=
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()).uniqueResult()).intValue(); jYI\.bc
criteria.setProjection $cflF@3
@#rF8;
(null); g\:(1oY
List items = WWZ`RY
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criteria.setFirstResult(startIndex).setMaxResults ^\KZE|^3@
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(pageSize).list(); -Q9} gaH_
PaginationSupport ps = d0YDNP%,_
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new PaginationSupport(items, totalCount, pageSize, 54r/s#|-3
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startIndex); x}B3h9]
return ps; [7_1GSS1
} hv
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}, true); 7Ji|x{``
} \SKobO?qI
@L0xU??"|
public List findAllByCriteria(final ZOw%Fw4B
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DetachedCriteria detachedCriteria){ *MC+i$
return(List) getHibernateTemplate qjDt6B^RO
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().execute(new HibernateCallback(){ ?h\fwF3
publicObject doInHibernate t\S=u y
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(Session session)throws HibernateException { kn%i#Fz
Criteria criteria = 6
);8z!+
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detachedCriteria.getExecutableCriteria(session); v(=?@tF}E
return criteria.list(); zi%Ql|zI~
} 9lqH
}, true); jzvrJ14
} 3n_N^q}
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public int getCountByCriteria(final As{ "B
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DetachedCriteria detachedCriteria){ > zA*W<g
Integer count = (Integer) mUA!GzJ~u-
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getHibernateTemplate().execute(new HibernateCallback(){ v9*31Jx
publicObject doInHibernate lWPh2k
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(Session session)throws HibernateException { VDT.L,9
Criteria criteria = tzJ7wXRr
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detachedCriteria.getExecutableCriteria(session); u43W.4H13
return [|A;{F#
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criteria.setProjection(Projections.rowCount /Ixv{H)H
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()).uniqueResult(); r:3h2J[_
} \:-"?
}, true); /L{V3}[j
return count.intValue(); fb+_]{7g
} *q; u%; 4
} xB`j*
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用户在web层构造查询条件detachedCriteria,和可选的 V!\'7-[R
{ k>T*/
startIndex,调用业务bean的相应findByCriteria方法,返回一个 ;&c9!LfP
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PaginationSupport的实例ps。 *47HN7
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ps.getItems()得到已分页好的结果集 o3W@)|>
ps.getIndexes()得到分页索引的数组 wU(p_G3
ps.getTotalCount()得到总结果数 l=UXikx
ps.getStartIndex()当前分页索引 :lW8f~!
ps.getNextIndex()下一页索引
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ps.getPreviousIndex()上一页索引
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 !LM9
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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 ',Y`\X
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一下代码重构了。 8 qlQC.VA[
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我把原本我的做法也提供出来供大家讨论吧: J4%"38l
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首先,为了实现分页查询,我封装了一个Page类: pz= /A
java代码: K;7ea47m N
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/*Created on 2005-4-14*/ 4s9qQ8?
package org.flyware.util.page; m
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/** 0SR[)ma
* @author Joa & LhQr-g
* %mAwK<MY`
*/ bgeJVI
publicclass Page { MFn\[J`Ra
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/** imply if the page has previous page */ `
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privateboolean hasPrePage; 3aw-fuuIb
O"}O~lZ[6T
/** imply if the page has next page */ |?v .5|1
privateboolean hasNextPage; qND:LP\_v
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/** the number of every page */ </pt($
privateint everyPage;
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+
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/** the total page number */ K5 EJ#1ov
privateint totalPage; 87F]a3
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/** the number of current page */ %Z8wUG
privateint currentPage; 7+Er}y>
@^%YOorr
/** the begin index of the records by the current FqZD'Uu7
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query */ XMzQ8|]
privateint beginIndex; P{HR='2
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/** The default constructor */ .pG`/[*a
public Page(){ GL _hRu
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} `YY07(%
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/** construct the page by everyPage 3:<[;yo
* @param everyPage F-XMy>9
* */ *^KEb")$
public Page(int everyPage){ <sn,X0W
this.everyPage = everyPage; PZY6
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} XP[~ :+
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/** The whole constructor */ Tv `&
public Page(boolean hasPrePage, boolean hasNextPage, .e4upTGU
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int everyPage, int totalPage, b'I@TLE')
int currentPage, int beginIndex){ ^A=2#j~H\
this.hasPrePage = hasPrePage; WD5jO9Oai
this.hasNextPage = hasNextPage; :)y3&