Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Ax=k0%M[&
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 9`/\|t|V
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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 m17H#!`
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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 piRP2Lbm*
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分页支持类: dv+)U9at
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java代码: VQr)VU=jb
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package com.javaeye.common.util; Ip/_uDi+!Z
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import java.util.List; o%+8.Tx6wT
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publicclass PaginationSupport { YQzs0t ,
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publicfinalstaticint PAGESIZE = 30; Y7{9C*>
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privateint pageSize = PAGESIZE; QMGMXa
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privateList items; Z7<N<
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privateint totalCount; t7rz]EN
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privateint[] indexes = newint[0]; $Ik\^:-
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privateint startIndex = 0; By| y:
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public PaginationSupport(List items, int C F2*W).+
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totalCount){ -r9G5Z!|n
setPageSize(PAGESIZE); O.n pi: a
setTotalCount(totalCount); F2/-Wk@
setItems(items); Rc2| o.'y
setStartIndex(0);
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} RCED
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public PaginationSupport(List items, int U"} ml
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totalCount, int startIndex){ 7-nz'-'
setPageSize(PAGESIZE); S!0ocS!t
setTotalCount(totalCount); {wWh;
setItems(items); x)M=_u2 _
setStartIndex(startIndex); T{1Z(M+
} i"}%ib*X
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public PaginationSupport(List items, int ~/hyf] *j
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totalCount, int pageSize, int startIndex){ LQ5 WS
setPageSize(pageSize); ^<0u~u)%T
setTotalCount(totalCount); %,u_`P
setItems(items); PTfy#
setStartIndex(startIndex); |fXwH> 'sw
} WlHw\\ur
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publicList getItems(){
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return items; qRMH[F$`
} t'@1FA!)
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publicvoid setItems(List items){ |k~\E|^
this.items = items; gkdd#Nrk
} 4qtjP8Zv[
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publicint getPageSize(){
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return pageSize; $42C4I*E
} ]| oh1q
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publicvoid setPageSize(int pageSize){ 9Wng(ef6G
this.pageSize = pageSize; Q ^%+r"h
} U88-K1G
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publicint getTotalCount(){ >|jSd2_p
return totalCount; v~>^c1:
} =F2e*?a3
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publicvoid setTotalCount(int totalCount){ Ds|/\cI$%a
if(totalCount > 0){ vpOn0([hS
this.totalCount = totalCount; 4&IBNc,sn
int count = totalCount / j_PICv*6
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pageSize; k;v23
if(totalCount % pageSize > 0) |t^7L )&y
count++; 4ed+'-"m
indexes = newint[count]; %C*oy$.
for(int i = 0; i < count; i++){ PJu)%al
indexes = pageSize * yZ t}Jnv
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} =T$-idx1l
}else{ hETTD%
this.totalCount = 0; MR$Bl"d
} 45l/)=@@B
} cDMA#gp
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publicint[] getIndexes(){ [m7jZOEu
return indexes; RG=!,#X
} 2F(zHa
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publicvoid setIndexes(int[] indexes){ kd9rvy0oK
this.indexes = indexes; B@ZedXi
} *V(TNLIh;
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publicint getStartIndex(){ EJ P##eGx
return startIndex; J2_D P
} T_CYSS|fX
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publicvoid setStartIndex(int startIndex){ L 0kK' n?
if(totalCount <= 0) !n4p*<Y6
this.startIndex = 0; kQXtO)
elseif(startIndex >= totalCount) gio'_X
this.startIndex = indexes ^YzFEu$
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[indexes.length - 1]; w~>V2u_-
elseif(startIndex < 0) }0c
this.startIndex = 0; Ex35
else{ Wbc*x
this.startIndex = indexes /X)fWO S6
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[startIndex / pageSize]; O.S(H1z<G
} `i0RLGze
} '7}s25[{\
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publicint getNextIndex(){
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int nextIndex = getStartIndex() + (NUwkAOM}
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pageSize; UX=JWb_uGm
if(nextIndex >= totalCount) 'S<ebwRd=
return getStartIndex(); TfK$tTkM
else N ?0T3-/K
return nextIndex; 5!,`LM9
} w@Ut[
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publicint getPreviousIndex(){ %^}3:0G
int previousIndex = getStartIndex() - <N^2|*3
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pageSize; \:C@L&3[
if(previousIndex < 0) iF2/:iP
return0; y8jk9Tv
else +~Ri CZt
return previousIndex; b8v?@s~
} jI0gQ [
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} $d.UF!s
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抽象业务类 gTZ1LJ
java代码: '~A~gK0
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/** a%DnRkRr
* Created on 2005-7-12 D]resk
*/ 5=/H2T!F
package com.javaeye.common.business; I$v*SeVHE
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import java.io.Serializable; Yd:8iJA
import java.util.List; EI6K0{'&X
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import org.hibernate.Criteria; "#^11 o8
import org.hibernate.HibernateException; 4Y8/>uL
import org.hibernate.Session; 62Yi1<kV@
import org.hibernate.criterion.DetachedCriteria; 9r!psRA:`)
import org.hibernate.criterion.Projections; <<K G S
import EX UjdJs"
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org.springframework.orm.hibernate3.HibernateCallback; Kf
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import z
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org.springframework.orm.hibernate3.support.HibernateDaoS W#E-vi+l
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upport; `~QS3zq
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import com.javaeye.common.util.PaginationSupport; sF}T9Ue
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public abstract class AbstractManager extends Jw?J(ig^
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HibernateDaoSupport { UOy9N
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privateboolean cacheQueries = false; <7cm[
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privateString queryCacheRegion; U=MFNp+
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publicvoid setCacheQueries(boolean Hzh?w!Ow
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cacheQueries){ B$"CoLC7+
this.cacheQueries = cacheQueries; F?xbVN
} jHq.W95+P
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publicvoid setQueryCacheRegion(String &m_4#
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queryCacheRegion){ \wqi_[A
this.queryCacheRegion = EE5I~k5
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queryCacheRegion; Vr0-evwfo
} f}b= FV{
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publicvoid save(finalObject entity){ 9mfqr$3
getHibernateTemplate().save(entity); E'zLgU)r`
} {(#Dou
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publicvoid persist(finalObject entity){ >QV=q`I
getHibernateTemplate().save(entity); LO0<=4iN(
} h-<2N)>!
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publicvoid update(finalObject entity){ {[QCuR
getHibernateTemplate().update(entity); zts%oIgV
} d- w#\ ^
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publicvoid delete(finalObject entity){ 1>bG]l1//
getHibernateTemplate().delete(entity); F1%-IBe
} :r*skV|
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publicObject load(finalClass entity, vfPL;__{Y]
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finalSerializable id){ EEmYfP[3
return getHibernateTemplate().load E4~k)4R
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(entity, id); ["VUSa
} "HSAwe`5jU
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publicObject get(finalClass entity, WVl yR\.
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finalSerializable id){ *T0{ yI
return getHibernateTemplate().get [A99e`
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(entity, id); ,;9byb
} z/yNFY]i
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publicList findAll(finalClass entity){ gwwYz]'d>r
return getHibernateTemplate().find("from mb_*FJB-_
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" + entity.getName()); |9cJO@
} }_m/3*x_
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publicList findByNamedQuery(finalString p\T.l<p
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namedQuery){ >DqV^%2l
return getHibernateTemplate g9~>m JR
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().findByNamedQuery(namedQuery); <yE
} CqGi
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publicList findByNamedQuery(finalString query, MBZ/Pzl~
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finalObject parameter){ 5lehASBz
return getHibernateTemplate Fy_D[g
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().findByNamedQuery(query, parameter); vqDd][ n
} ";\na!MT
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publicList findByNamedQuery(finalString query, z.EpRJn
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finalObject[] parameters){ ,kiyxh^
return getHibernateTemplate YmXh_bk
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().findByNamedQuery(query, parameters); 6S*L[zBnA\
} c!n\?lB
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publicList find(finalString query){ ghtvAG
return getHibernateTemplate().find \D
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(query); ? I7}4i7
} .URCuB\{
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publicList find(finalString query, finalObject %dA6vHI,
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parameter){ RJ+i~;-
return getHibernateTemplate().find @,btQ_'X
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(query, parameter); vhe[:`=a
} R0|dKKzS
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public PaginationSupport findPageByCriteria 1yHlBeEC
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(final DetachedCriteria detachedCriteria){ B.)!zv\{
return findPageByCriteria 53>y<
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); DbDi n
} \C<|yD
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public PaginationSupport findPageByCriteria |^: A,%>
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(final DetachedCriteria detachedCriteria, finalint )bCw~'h*
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startIndex){ F\LAw#IJ
return findPageByCriteria =QG@{?JTl
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(detachedCriteria, PaginationSupport.PAGESIZE, 4KH8dau.fF
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startIndex); ']]Czze
} N$cm;G=]
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public PaginationSupport findPageByCriteria >iE/t$%1
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(final DetachedCriteria detachedCriteria, finalint 8n_!WDD
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pageSize, B{x`^3qR
finalint startIndex){ OQl7#`G!H%
return(PaginationSupport) TV&:`kH
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getHibernateTemplate().execute(new HibernateCallback(){ T
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publicObject doInHibernate # !:u*1
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(Session session)throws HibernateException { &~9'7 n!
Criteria criteria = e+`LtEve0
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detachedCriteria.getExecutableCriteria(session); #J4{W84B
int totalCount = W|C>X=zTi
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((Integer) criteria.setProjection(Projections.rowCount \PHbJN:BI
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()).uniqueResult()).intValue(); z`)i"O]-K_
criteria.setProjection }q8|t3
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(null); {Y0Uln5u
List items = F?h{IH
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criteria.setFirstResult(startIndex).setMaxResults }K<% h
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(pageSize).list(); tsGt,]O30
PaginationSupport ps = )(^L*
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new PaginationSupport(items, totalCount, pageSize, K'/,VALp
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startIndex); c)L1@ qdZ
return ps; NOzAk%s3I
} ,tZJSfHB
}, true); WD`z\{hcom
} 45?aV@
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public List findAllByCriteria(final P|0dZHpT
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DetachedCriteria detachedCriteria){ $9~6M*
return(List) getHibernateTemplate H YA<
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().execute(new HibernateCallback(){ ,}8|[)"
publicObject doInHibernate )\xDo<@
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(Session session)throws HibernateException { )R~l@QBN
Criteria criteria = 7IEG%FY
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detachedCriteria.getExecutableCriteria(session); ]H%SGQPn
return criteria.list(); -}_X'h&"
} p'@|Oq&
}, true); Y! 8 I
} 3izGMH_`
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public int getCountByCriteria(final F=T};b
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DetachedCriteria detachedCriteria){ @^O+ulLJ,]
Integer count = (Integer) }KEL{VUX
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getHibernateTemplate().execute(new HibernateCallback(){ `<cnb!]
publicObject doInHibernate [wLK*9@&
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(Session session)throws HibernateException { 9Q*T'+V
Criteria criteria = a;GuFnfn,
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detachedCriteria.getExecutableCriteria(session); q3_ceXYU
return &"_5?7_N
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criteria.setProjection(Projections.rowCount c3L)!]kB
@2X{e7+D
()).uniqueResult(); CC,f*I
} ,\%qERk
}, true); {/u}
return count.intValue(); qD]&&"B
} Exu5|0AAE
} WVa-0;
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用户在web层构造查询条件detachedCriteria,和可选的 z\kiYQ6kA
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 1xf
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PaginationSupport的实例ps。 I1Jhvyd?$
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ps.getItems()得到已分页好的结果集 `!um)4
ps.getIndexes()得到分页索引的数组 i 6DcLE
ps.getTotalCount()得到总结果数 D_)i%k\
ps.getStartIndex()当前分页索引 Yg~$1b@
ps.getNextIndex()下一页索引 A.8[FkiNmD
ps.getPreviousIndex()上一页索引 8AGP*"gI
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 %fF0<c^-U
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 A,u}p rwH
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一下代码重构了。 G+SMH`h
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我把原本我的做法也提供出来供大家讨论吧: (+iOy/5#u
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首先,为了实现分页查询,我封装了一个Page类: p7Xe[94d^
java代码: >[qoNy;
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/*Created on 2005-4-14*/ #Rj&PzBe
package org.flyware.util.page; h1U8z)D#
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/** tDj/!L`
* @author Joa >"/Sa_w
* C25EIIdRb
*/ vMHJgpd&j
publicclass Page { sI OT6L^7
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/** imply if the page has previous page */ ~\yk{1S
privateboolean hasPrePage; vIQu"J&fE
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/** imply if the page has next page */ B]lM69Hz
privateboolean hasNextPage; ETMF.-P
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/** the number of every page */ A?;KfVq
privateint everyPage; vFx0B?
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/** the total page number */ I%b}qC"5M
privateint totalPage; 6E))4
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/** the number of current page */ P: QSr8K
privateint currentPage; <?E~Qc t
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/** the begin index of the records by the current R\MFh!6sn
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query */ =}xH6^It
privateint beginIndex; py':UQS*q
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/** The default constructor */ of<(4<T
public Page(){ %-Oo92tP
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} 3o.9}`/
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/** construct the page by everyPage 0<$t9:dq
* @param everyPage nf,u'}psdJ
* */ ~}@cSv'(1
public Page(int everyPage){ 4.&