Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 %ejeyc
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 f9']
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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 }aZrou3E
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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 my,x9UPs
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分页支持类: 4 =Fg!Eu<
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java代码: cV]y=q6
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package com.javaeye.common.util; BE%Z\E[[m
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import java.util.List; /c^e&D
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publicclass PaginationSupport { K\X: G-C9
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publicfinalstaticint PAGESIZE = 30; D -iUN
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privateint pageSize = PAGESIZE; MOLO3?H(
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privateList items; A`C-sD>
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privateint totalCount; )KE_t^$
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privateint[] indexes = newint[0]; )l{A{f6O
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privateint startIndex = 0; N
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public PaginationSupport(List items, int .Qk{5=l6P
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totalCount){ ZvyjMLf
setPageSize(PAGESIZE); ;o%:7&
setTotalCount(totalCount); IQoH@l&Xk
setItems(items); sU*3\
setStartIndex(0); UKYupLu5
} p5`ZyD]+
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public PaginationSupport(List items, int Gt5$6>A
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totalCount, int startIndex){ e/P4mc)
setPageSize(PAGESIZE); CKN8z
setTotalCount(totalCount); )rbc;{.
setItems(items); r\bq[9dX>
setStartIndex(startIndex); ]
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} c85O_J
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public PaginationSupport(List items, int Fd}<Uote3
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totalCount, int pageSize, int startIndex){ =N;$0Y(g
setPageSize(pageSize); neIy~H_#!
setTotalCount(totalCount); rr)9Y][l}
setItems(items); NlMQHma
setStartIndex(startIndex); ,W8au"
} :@WLGK*u.
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publicList getItems(){ @92gb$xT
return items; uc\.oG;~q
} Hp*gv/0
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publicvoid setItems(List items){ >& [3
this.items = items; Q~h6J*
} QglYU
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publicint getPageSize(){ !4L#$VG
return pageSize; ?.~]mvOR
} bWUS9WT
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publicvoid setPageSize(int pageSize){ R;.d/U|av
this.pageSize = pageSize; 9g4QVo|
} jvWI_Fto
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publicint getTotalCount(){ /Q]:Uf.J
return totalCount; Ef-a4Pi
} BQuRHi IV
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publicvoid setTotalCount(int totalCount){ !HvGlj@(|
if(totalCount > 0){ =s6E/K
this.totalCount = totalCount; fls#LcI9>6
int count = totalCount / ~X[S<Gi#
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pageSize; B0S8vU
if(totalCount % pageSize > 0) N]V/83_
count++; >|5XaaDa
indexes = newint[count]; xdCs5ko
for(int i = 0; i < count; i++){ 5UPPk$8`
indexes = pageSize * (UXv,_"nU
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} /XjN%|
}else{ vB=;_=^i1
this.totalCount = 0; Bmmb
} :mzCeX8 *
} #fO*ROe
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publicint[] getIndexes(){ j,Pwket
return indexes; m\1VF\
} ~NA1SZ{Y+
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publicvoid setIndexes(int[] indexes){ m\/>C|f\
this.indexes = indexes; R9bhC9NP
} <r0.ppgY
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publicint getStartIndex(){ hyM'x*
return startIndex; F
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} _`slkwP.
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publicvoid setStartIndex(int startIndex){ Ck:#1-t8{
if(totalCount <= 0) OuMco+C
this.startIndex = 0; >7"$}5d
elseif(startIndex >= totalCount) "^Y6ctw
this.startIndex = indexes }7-7t{G
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[indexes.length - 1]; &3jBE--
elseif(startIndex < 0) Lf[G>0t&n
this.startIndex = 0; !-F ^VGD(8
else{ 7 kEx48
this.startIndex = indexes Oi6f8*,
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[startIndex / pageSize]; 2%`^(\y
} D!c1;IHZ
} -mE
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publicint getNextIndex(){ Cc@=?
int nextIndex = getStartIndex() + ]d[Rf$>vu0
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pageSize; (s5<
if(nextIndex >= totalCount) >6*(}L9
return getStartIndex(); Y>xi|TWN
else nXv 7OEpTx
return nextIndex; "xL;(Fqu
} lv=yz\
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publicint getPreviousIndex(){ q-A`/9
int previousIndex = getStartIndex() - fEx+gQW_
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pageSize; Rrh<mo(yj#
if(previousIndex < 0) m(8jSGV
return0; c Bg,k[,
else JZWgr&O<
return previousIndex; (y-x01H
} <WZ1-
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} x:!C(Ep)
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抽象业务类 R;0W+!fE
java代码: ZMdM_i?
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/** }f<fgY
* Created on 2005-7-12 [?Mc4uT{
*/ C/{nr-V3u
package com.javaeye.common.business; *p" "YEN
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import java.io.Serializable; Es.toOH$S
import java.util.List; 73'U#@g6
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import org.hibernate.Criteria; 3*CzXK>`M&
import org.hibernate.HibernateException; 7JxE|G
import org.hibernate.Session; #[gcg]6c
import org.hibernate.criterion.DetachedCriteria; WF+bN#YJ
import org.hibernate.criterion.Projections; B
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import 8O"x;3I9
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org.springframework.orm.hibernate3.HibernateCallback; &:;/]cwj
import u@GRN`yn
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org.springframework.orm.hibernate3.support.HibernateDaoS *,O
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upport; X{0ax.
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import com.javaeye.common.util.PaginationSupport; =fKhXd
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public abstract class AbstractManager extends ?&whE!
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HibernateDaoSupport { EpFIKV!
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privateboolean cacheQueries = false; D=i0e8D!+
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privateString queryCacheRegion; 1?/5A|?V4+
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publicvoid setCacheQueries(boolean fK)ZJ_?w,@
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cacheQueries){ GCf._8;%
this.cacheQueries = cacheQueries; %f_)<NP9=
} sf.E|]isW
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publicvoid setQueryCacheRegion(String J]n7| L
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queryCacheRegion){ kr/1Dsr4
this.queryCacheRegion = C$N4
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queryCacheRegion; "<cB73tY
} +XU$GSw3(
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publicvoid save(finalObject entity){ TS\A`{^T
getHibernateTemplate().save(entity); /o<}]]YBF
} J[<D/WIH
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publicvoid persist(finalObject entity){ vWnHC
getHibernateTemplate().save(entity); +P>
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} H#1*'e>
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publicvoid update(finalObject entity){ o+if%3
getHibernateTemplate().update(entity); "6I-]:K-
} T!=20 !I
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publicvoid delete(finalObject entity){ 'gk81@|
getHibernateTemplate().delete(entity); a0V8L+v(
} .J<qfQ
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publicObject load(finalClass entity, p5twL
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finalSerializable id){ 5Gw!9{ke
return getHibernateTemplate().load NE;(..
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(entity, id); s0`|G|.}
} ={mPg+Ei'
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publicObject get(finalClass entity, y:hCBgc;`c
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finalSerializable id){ QigoRB!z#9
return getHibernateTemplate().get Ads<-.R
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(entity, id); 3G%XG{dg
} 2h|(8f:y
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publicList findAll(finalClass entity){ TY54e T
return getHibernateTemplate().find("from JT.\f,z&
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" + entity.getName()); 7=QC+XSO
} Pw^c2TQ
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publicList findByNamedQuery(finalString {g!exbVf
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namedQuery){ #v~S",*.f
return getHibernateTemplate z`xz~9a<
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().findByNamedQuery(namedQuery); ;)=zvr17
} njwR~ aL`|
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publicList findByNamedQuery(finalString query, O=#/DM;
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finalObject parameter){ -u3SsU)_%N
return getHibernateTemplate cDQw`ORP*g
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().findByNamedQuery(query, parameter); yqVaA 'w5
} *OGXu07 !
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publicList findByNamedQuery(finalString query, +,F=
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finalObject[] parameters){ lU50.7<08
return getHibernateTemplate f@;>M9)<
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().findByNamedQuery(query, parameters); ?%za:{
} Ng_rb KXC#
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publicList find(finalString query){ 2=/g~rp*
return getHibernateTemplate().find tO+ %b=Z^
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(query); 21/a3Mlx#
} GdfKxSO
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publicList find(finalString query, finalObject E/L?D
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parameter){ 9a~BAH,j
return getHibernateTemplate().find 6ImV5^l
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(query, parameter); X!MfJ^)q
} Xv5Ev@T
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public PaginationSupport findPageByCriteria |H+k?C-w
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(final DetachedCriteria detachedCriteria){ 0JZq:hUd
return findPageByCriteria W-]yKSob
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); r/q1&*T
} cV,03]x
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public PaginationSupport findPageByCriteria *l?%
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(final DetachedCriteria detachedCriteria, finalint I|3v&E1
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startIndex){ WfjUJw5x"s
return findPageByCriteria o%~K4 M".
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(detachedCriteria, PaginationSupport.PAGESIZE, :J4C'N
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startIndex); #:\+7mCF
} J*lYH]s
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public PaginationSupport findPageByCriteria LWb}) #E
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(final DetachedCriteria detachedCriteria, finalint RoM*Qjw
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pageSize, $evuPm8G
finalint startIndex){ tSXjp
return(PaginationSupport) _Fh0^O@
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getHibernateTemplate().execute(new HibernateCallback(){ X8l1xD
publicObject doInHibernate Q-dHR
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(Session session)throws HibernateException { Bzy=@]`
Criteria criteria = gmAKW4(
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detachedCriteria.getExecutableCriteria(session); )RCqsFjK
int totalCount = wPO@f~[Ji
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((Integer) criteria.setProjection(Projections.rowCount _2!e!Z
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()).uniqueResult()).intValue(); 9B;Sk]y
criteria.setProjection eP'kY(g8
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(null); -qCJwz30
List items = }9Dv\"t5
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criteria.setFirstResult(startIndex).setMaxResults c%3
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(pageSize).list(); \utH*;J|x
PaginationSupport ps = G-i_s6Wu
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new PaginationSupport(items, totalCount, pageSize, .idl@%
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startIndex); .W+4sax:
return ps; i K[8At"Xo
} D i1G
}, true); vls> 6h
} [c!vsh]^
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public List findAllByCriteria(final ~V-
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DetachedCriteria detachedCriteria){ BMj&*p8R
return(List) getHibernateTemplate eD1MP<>h
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().execute(new HibernateCallback(){ rHdP4: n
publicObject doInHibernate WI4_4
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(Session session)throws HibernateException { C`_D{r
Criteria criteria = 5F+ f '~
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detachedCriteria.getExecutableCriteria(session); 5'Ay@FJ:
return criteria.list(); n2hsG.4
} ^A<.s_
}, true); w>UV\`x
} )ZU#19vr7
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public int getCountByCriteria(final >)Z2bCe
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DetachedCriteria detachedCriteria){ 43Uy<%yb>}
Integer count = (Integer) VQ;-
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getHibernateTemplate().execute(new HibernateCallback(){ |w]i$`3'I
publicObject doInHibernate 8A]q!To
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(Session session)throws HibernateException { &>4$ [m>n
Criteria criteria = 9U1!"/F
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detachedCriteria.getExecutableCriteria(session); |wn LxI
return F7Yuky
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criteria.setProjection(Projections.rowCount I}0-
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()).uniqueResult(); 5P2FNUKL
} 4qR Q,g{$T
}, true); ]b=A/*z
return count.intValue(); Yy~ Dg
} G%/cV?18
} Y k6WSurw
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用户在web层构造查询条件detachedCriteria,和可选的 ^o<Nz8
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 a2)*tbM9\
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PaginationSupport的实例ps。 ATewdq[C
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ps.getItems()得到已分页好的结果集 5d;K.O
ps.getIndexes()得到分页索引的数组 X
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ps.getTotalCount()得到总结果数 EqwA8?M
ps.getStartIndex()当前分页索引 OU=IV;V{
ps.getNextIndex()下一页索引 Dp'af4+%$
ps.getPreviousIndex()上一页索引 ;b2>y>?[
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 > _) a7%
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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 Nq1RAM
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一下代码重构了。 ]qQB+]WN
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我把原本我的做法也提供出来供大家讨论吧: ,FPgs0rrS
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首先,为了实现分页查询,我封装了一个Page类: :9>nY
java代码: F<1'M#bl
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/*Created on 2005-4-14*/ y!Eh /KD
package org.flyware.util.page; PSvRO%&
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/** @72G*u\Wz
* @author Joa h<jIg$rA
* <m\TZQBD
*/ v2SsfhT
publicclass Page { S+ x[1#r
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/** imply if the page has previous page */ ";%1sK
privateboolean hasPrePage; $x<-PN
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/** imply if the page has next page */ }zLE*b,
privateboolean hasNextPage; z}|'&O*.F
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/** the number of every page */ }?$Mh)
privateint everyPage; A-5%_M3\G
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/** the total page number */ {K}+$jzGVt
privateint totalPage; #]a0 51Y
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/** the number of current page */ F U%b"gP^
privateint currentPage; f5eX%FR
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/** the begin index of the records by the current w}0PtzOe
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query */ |hAGgo/03
privateint beginIndex; (yVI<Os{a
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/** The default constructor */ \^D`Hvg
public Page(){ AUd}) UR
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} ul1Vsj
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/** construct the page by everyPage #YV;Gp(2h
* @param everyPage CK%W+";
* */ TlJF{ <E
public Page(int everyPage){ nfU}ECun4
this.everyPage = everyPage; p<NgT1"{
} q9>w3
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/** The whole constructor */ ^|2qD:
;
public Page(boolean hasPrePage, boolean hasNextPage, W*#/@/5
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int everyPage, int totalPage, XPSWAp)
int currentPage, int beginIndex){ G%{jU'2
this.hasPrePage = hasPrePage; fzcT(y
this.hasNextPage = hasNextPage; Xb {y*',
this.everyPage = everyPage; xae7#d0
this.totalPage = totalPage; T/nRc_I+^B
this.currentPage = currentPage; 6{ Eh={:b
this.beginIndex = beginIndex; 1U!CD-%(
} 5,3h'\ "!
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/** N~_gT
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* @return :8FH{sqR
* Returns the beginIndex. z%z$'m
*/ +xa2e?A%L
publicint getBeginIndex(){ YrX{,YtiX
return beginIndex; G5Nub9_*X
} y+_U6rv[
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/** 92R{V%)G
* @param beginIndex 7UiU3SUcg
* The beginIndex to set. K} @q+
*/ {1mD(+pJ{
publicvoid setBeginIndex(int beginIndex){ n%}0hVu
this.beginIndex = beginIndex; 7>TG
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} NUseYU``
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/** nN:i{t4f
* @return C\Rd]P8\
* Returns the currentPage. idQr^{
*/ OmW|\d PU
publicint getCurrentPage(){ C.|MA(7
return currentPage; L!5HE])<)
} :\Dm=Q\
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/** 4_eq@'9-q
* @param currentPage BR*U9K|W
* The currentPage to set. G!uxpZ
*/ wS*UXF&f
publicvoid setCurrentPage(int currentPage){ bk|>a=o3
this.currentPage = currentPage; I[/u5V_b'
} H
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/** kE1u-EA
* @return R~o?X^^O
* Returns the everyPage. qohUxtnTK>
*/ U3>G9g>^B
publicint getEveryPage(){ >dO^pDSs
return everyPage; ( Qnn
} &7cy9Z~m
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/** MC3{LVNK
* @param everyPage K(hf)1q
* The everyPage to set. k&*=:y}
*/ d] {^
publicvoid setEveryPage(int everyPage){ fu/v1~X
this.everyPage = everyPage; S&y