Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 t0kZFU
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 @F*z/E}e
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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 5|>ms)[RQ
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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 eibkG
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分页支持类: VUP.
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java代码: dm40qj
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package com.javaeye.common.util; .*xO/pn
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import java.util.List; qm'@o -[
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publicclass PaginationSupport { @g]+$Yj
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publicfinalstaticint PAGESIZE = 30; Pn4jI(
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privateint pageSize = PAGESIZE; +2}Ar<elP
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privateList items; |9Yx`_DF
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privateint totalCount; KK]R@{ r
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privateint[] indexes = newint[0]; Pth4_]US
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privateint startIndex = 0; $}5M`p\&C
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public PaginationSupport(List items, int e%4vvPp
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totalCount){ |2=w":2#
setPageSize(PAGESIZE); w@O)b-b|w
setTotalCount(totalCount); ;`kOFg#`)c
setItems(items); S4_ZG>\VT
setStartIndex(0); +
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} TiZ
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public PaginationSupport(List items, int Zy{hYHQ
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totalCount, int startIndex){ | z_av
setPageSize(PAGESIZE); Ol<LL#<j4
setTotalCount(totalCount); 9&<c)sS&B
setItems(items); B<h4ZK%
setStartIndex(startIndex); ,?Vxcr
} +u t%C.1
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public PaginationSupport(List items, int n<HF]
) te_ <W
totalCount, int pageSize, int startIndex){ 0}'/p N>
setPageSize(pageSize); !U(KQ:j
setTotalCount(totalCount); K|6}g7&X
setItems(items); xG Y!r"[
setStartIndex(startIndex); f,LeJTX=
} AXi4{Q,
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publicList getItems(){ JHVndK4L
return items; R$MR|
} &hi][Pt
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publicvoid setItems(List items){ pCa~:q*85
this.items = items; rq1~%S
} EG8z&^O x
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publicint getPageSize(){ z~v-8aw
return pageSize; k<f0moxs'
} F8{T/YhZ
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publicvoid setPageSize(int pageSize){ 9)j"|5H
this.pageSize = pageSize; KBI1t$
} t=p"nIE
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publicint getTotalCount(){ FT}^Fi7
return totalCount; %$Q!'+YW
} /BF7N3
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publicvoid setTotalCount(int totalCount){ >qGWDCKr
if(totalCount > 0){ 20` XklV
this.totalCount = totalCount; L ]BTX]
int count = totalCount / 73tjDO7d
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pageSize; _n4`mL8>kH
if(totalCount % pageSize > 0) c\tw#;\9
count++; Ls.g\Gl3
indexes = newint[count]; /8hjs{(;
for(int i = 0; i < count; i++){ V2tA!II-s
indexes = pageSize * p!?7;
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} wJvk
}else{ G`;mSq6i
this.totalCount = 0; F%{z EANm
} ~Sd,Tu%:
} 5VfpeA`
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publicint[] getIndexes(){ F[.IF5_
return indexes; +s [_
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} lb"T'}q
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publicvoid setIndexes(int[] indexes){ }2Im?Q
this.indexes = indexes; l|9'l[}&
} WFqOVI*l
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publicint getStartIndex(){ '64/2x
return startIndex; jd
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} &N%-.&t'
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publicvoid setStartIndex(int startIndex){ *\Hut'7 d
if(totalCount <= 0) ~H]d9C
this.startIndex = 0; y G>sBc
elseif(startIndex >= totalCount) $ WWi2cI;
this.startIndex = indexes n4ti{-^4|d
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[indexes.length - 1]; =)]RD%Oq
elseif(startIndex < 0) 91#n Aj%
this.startIndex = 0; %]O#t<D
else{ ]7h;MR
this.startIndex = indexes xz,M>Ua
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[startIndex / pageSize]; I+Fr#1
} VrFI5_M/
} mj y+_
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publicint getNextIndex(){ E
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int nextIndex = getStartIndex() + F#efs6{
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pageSize; b|`
if(nextIndex >= totalCount) uQWd`7
return getStartIndex(); ^^)\|kW?
else $>%zNq-F
return nextIndex; 6(HJYa
}
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publicint getPreviousIndex(){ 27H4en; o=
int previousIndex = getStartIndex() - HsK52<
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pageSize; %5(v'/dQ
if(previousIndex < 0)
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else Z,b^f
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return previousIndex; a&R,jq
} 1+Y;
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抽象业务类 Szlww
java代码: _LZ 442
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/** 0+S'i82=M
* Created on 2005-7-12 F=kiYa}
*/ ;nf}O87~
package com.javaeye.common.business; tLx8}@X"
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import java.io.Serializable; v8A{q
import java.util.List; QOF'SEq"k
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import org.hibernate.Criteria; N{zou?+
import org.hibernate.HibernateException; u+8?'ZT,
import org.hibernate.Session; 2l4`h)_q
import org.hibernate.criterion.DetachedCriteria; *K w/ilI
import org.hibernate.criterion.Projections; k:zGv
import +;;pM[U
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org.springframework.orm.hibernate3.HibernateCallback; HM\gOz
import %w6lNl
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org.springframework.orm.hibernate3.support.HibernateDaoS UX<0/"0h
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upport; OB~74}3;
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import com.javaeye.common.util.PaginationSupport; O<w7PS
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public abstract class AbstractManager extends GP}+c8|2
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HibernateDaoSupport { v_@!u`
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privateboolean cacheQueries = false; 4:v{\R
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privateString queryCacheRegion;
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publicvoid setCacheQueries(boolean NW;wy;;
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cacheQueries){ %|3UWN
this.cacheQueries = cacheQueries; Tk4"qGC.
} [p_C?hHO
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publicvoid setQueryCacheRegion(String ZpY"P6
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queryCacheRegion){ FKB)o7
this.queryCacheRegion = >pA9'KWs]
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queryCacheRegion; b; 4;WtBO
} _qqJ>E<0
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publicvoid save(finalObject entity){ U
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getHibernateTemplate().save(entity); mCx6$jz
} tMy@'nj
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publicvoid persist(finalObject entity){ 7gQ~"Q
getHibernateTemplate().save(entity); \(bML#I
} jVu3 !{}
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publicvoid update(finalObject entity){ [HENk34
getHibernateTemplate().update(entity); uJ$!lyJ6L
} !xK`:[B
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publicvoid delete(finalObject entity){ Nm=W?i
getHibernateTemplate().delete(entity); nEm+cHHo?
} 1{V* (=Tp
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publicObject load(finalClass entity, SLc'1{
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finalSerializable id){ D*j\gI
return getHibernateTemplate().load QRv2%^L
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(entity, id); 4m6E~_:F
} F
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publicObject get(finalClass entity, bXiT}5mJU
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finalSerializable id){ A3N<;OOk
return getHibernateTemplate().get AHhck?M^
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(entity, id); DP9hvu/85
} YX_p3
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publicList findAll(finalClass entity){ Dl%NVi+n
return getHibernateTemplate().find("from Pw'3ya8
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" + entity.getName()); =6TD3k6(2
} L%JmdY;
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publicList findByNamedQuery(finalString ;HJ|)PN5L
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namedQuery){ u#Qd`@p
return getHibernateTemplate Ro?aDrQ
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().findByNamedQuery(namedQuery); FXOA1VEg
} jxr~cp?4
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publicList findByNamedQuery(finalString query, |L4K#
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finalObject parameter){ ;Z"6ve4
return getHibernateTemplate ]J C}il_b
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().findByNamedQuery(query, parameter); ?j8F5(HF?
} B@l/'$G
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publicList findByNamedQuery(finalString query, [L,Tf_t^Y
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finalObject[] parameters){ u%S&EuX
return getHibernateTemplate yla&/K;|*
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().findByNamedQuery(query, parameters); </|IgN$w`
} *O|Z[>
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publicList find(finalString query){ T'l >$6
return getHibernateTemplate().find {ls$#a+d
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(query); 0t1WvW
} )sVz;rF<
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publicList find(finalString query, finalObject V 3-5:z
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parameter){ J]~LmSh
return getHibernateTemplate().find R$=UJ}>
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(query, parameter); EOjo>w>
} ^'~+ w3M@
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public PaginationSupport findPageByCriteria 8|`4D 'Ln
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(final DetachedCriteria detachedCriteria){ o@r+Y
return findPageByCriteria k#%BxT
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 7%9Sz5z
} bH&Cbme90-
{
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public PaginationSupport findPageByCriteria d$/BF&n
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(final DetachedCriteria detachedCriteria, finalint $cFanra
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startIndex){ "*WzoRA={
return findPageByCriteria yK<%AV@v
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(detachedCriteria, PaginationSupport.PAGESIZE, C XZm/^
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startIndex); q3B#rje>h
} _* ] ~MQ=
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public PaginationSupport findPageByCriteria 'Uew(o
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(final DetachedCriteria detachedCriteria, finalint LZV
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pageSize, !dYkvoQNn
finalint startIndex){ W~
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return(PaginationSupport) R}a,.C
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getHibernateTemplate().execute(new HibernateCallback(){ H?8KTl=e
publicObject doInHibernate JNRG[j
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(Session session)throws HibernateException { l=[<gPE
Criteria criteria = #[C|%uq
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detachedCriteria.getExecutableCriteria(session); gd-4hR
int totalCount = /Ws@YP
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((Integer) criteria.setProjection(Projections.rowCount &96I4su
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()).uniqueResult()).intValue(); PmO utYV
criteria.setProjection MRiQaUg2
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(null); xxgS!J
List items = f2B?Zn
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criteria.setFirstResult(startIndex).setMaxResults &F*s.gL
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(pageSize).list(); at${^,&
PaginationSupport ps = z@^[.
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new PaginationSupport(items, totalCount, pageSize, mdR:XuRD"t
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startIndex); ~T9%%W[
return ps; hV])\t=yf
} G0Smss=K
}, true); E8u:Fgs
} }9
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public List findAllByCriteria(final &/}]9 #
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DetachedCriteria detachedCriteria){ y!;rY1
return(List) getHibernateTemplate _9wX8fh3D
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().execute(new HibernateCallback(){ NduvfA4
publicObject doInHibernate lwaxj7
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(Session session)throws HibernateException { -mOSB(#bo
Criteria criteria = "]Wrir?l
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detachedCriteria.getExecutableCriteria(session); O E0w/{
return criteria.list(); T>e!DOW;
} =0TnH<`
}, true); mS5'q q;t
} fDhV
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public int getCountByCriteria(final LCx{7bN1ro
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DetachedCriteria detachedCriteria){ N^pTj<M<g
Integer count = (Integer) OACRw%J:X{
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getHibernateTemplate().execute(new HibernateCallback(){ os|8/[gT
publicObject doInHibernate "qjkwf)\
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(Session session)throws HibernateException { mk8xNpk B
Criteria criteria = I?LJXo \O
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detachedCriteria.getExecutableCriteria(session); j+"i$ln+s
return ^EWkJW,Yc
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criteria.setProjection(Projections.rowCount 0m7ANqE[Z
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()).uniqueResult(); zD:"O4ZM^^
} O-y/K2MC*
}, true); k'E3{8<!
return count.intValue(); Mh"DPt9@J
} %yX?4T;b
} 2jV.\C k
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用户在web层构造查询条件detachedCriteria,和可选的 ~A2{$C
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 mIgc)"
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PaginationSupport的实例ps。 {I0b%>r=
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ps.getItems()得到已分页好的结果集 q&OF?z7H
ps.getIndexes()得到分页索引的数组 S7]\tw_L)
ps.getTotalCount()得到总结果数 EITA[Ba B`
ps.getStartIndex()当前分页索引 L)W1bW}
ps.getNextIndex()下一页索引 /|V!2dQs"
ps.getPreviousIndex()上一页索引 (|+Sbq(o
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 wZB:7E%
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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 )Be?axI
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一下代码重构了。 3<.]+ukm
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我把原本我的做法也提供出来供大家讨论吧: )@+lfIE(l
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首先,为了实现分页查询,我封装了一个Page类: Syv[[Ek
java代码: Otq`4 5
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/*Created on 2005-4-14*/ ]Hr:|2|.
package org.flyware.util.page; ^*JpdmVhu
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/** -5;Kyio
* @author Joa !lxs1!:
*
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*/ -}avH
publicclass Page { .,Qj3
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/** imply if the page has previous page */ > SRUC
privateboolean hasPrePage; Tk~RT<\Ab+
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/** imply if the page has next page */ ,Vb;2
privateboolean hasNextPage; GZJIIP#
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/** the number of every page */ ]gHxvT\E
privateint everyPage; K5l#dl_T
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/** the total page number */ s}"5uDfn1F
privateint totalPage; T}')QC&wQ
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/** the number of current page */ bz5",8Mn
privateint currentPage;
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/** the begin index of the records by the current 0zH^yx:ma
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query */ &"X6s%ZH|
privateint beginIndex; fzcPi9+
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/** The default constructor */ P(iZGOKUs=
public Page(){ CbPCj.MH
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} 5gP<+S#>T
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/** construct the page by everyPage Qdepzo>E
* @param everyPage W5'07N^
* */ 6 0C;J!D
public Page(int everyPage){ p1}Y|m!
this.everyPage = everyPage; 3Ee8_(E\
} 6AS'MD%&
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/** The whole constructor */ 9iMQq40
public Page(boolean hasPrePage, boolean hasNextPage, P
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int everyPage, int totalPage, >y
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int currentPage, int beginIndex){ 2kv%k3Q{
this.hasPrePage = hasPrePage; .-kqt^Gc
this.hasNextPage = hasNextPage; PqOy"HO
this.everyPage = everyPage; 5<0d2bK$
this.totalPage = totalPage; \)?mIwo7~
this.currentPage = currentPage; oECM1'=Bf
this.beginIndex = beginIndex; aFkxR\x
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} *7L*:g
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/** OBF3)L]
* @return }h+_kRQ
* Returns the beginIndex. TWv${m zE
*/ g 4n&k
publicint getBeginIndex(){ F[aow$",+}
return beginIndex; i&cH
} @(:ah
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/** {?a9>g-BW
* @param beginIndex d<*4)MRN
* The beginIndex to set. qF9rY)ifm
*/ 7Pt*V@DHS
publicvoid setBeginIndex(int beginIndex){ j
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this.beginIndex = beginIndex; 9&'I?D&8
} , N:'Z
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/** rWN#QL()*
* @return 3YY<2<
* Returns the currentPage. WIwbf |\
*/ ;bt@wgY
publicint getCurrentPage(){ Y`FGD25`
return currentPage; ,v"/3Ff{,
} ++KY+j.^
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/** JOj\#!\>k0
* @param currentPage X,- '
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* The currentPage to set. Z&mV1dxR
*/ NJYx.TL
publicvoid setCurrentPage(int currentPage){ <`dF~
this.currentPage = currentPage; qZ!1>`B
} \!UNale
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/** &77]h%B>
* @return ivdw1g|)h
* Returns the everyPage. y$)gj4k/D
*/ Q9K+k*?{N
publicint getEveryPage(){ Isq3YY
return everyPage; 9Ao0$|@b
} {GF>HHQb
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/** vOYcS$,^X%
* @param everyPage B0c} 5V
* The everyPage to set. '-#6;_ i<
*/ +n(H"I7cU
publicvoid setEveryPage(int everyPage){ ,2>:h"^
this.everyPage = everyPage; b("JgE`
} YYI
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/** oeXNb4; 4
* @return >J=x";,D|~
* Returns the hasNextPage. YtQKsM
*/ FV/xp}nz
publicboolean getHasNextPage(){ T0_9:I`&
return hasNextPage; wAHb5>!
} syh0E=If_
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/** GS{:7%=j
* @param hasNextPage AK<ZP?0
* The hasNextPage to set. x7e
*/ D} 0>x~
publicvoid setHasNextPage(boolean hasNextPage){ :C42yQAP
this.hasNextPage = hasNextPage; &Q