Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 f]}F_]
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Qp,l>k
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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 0bE_iu>f'
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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 cx|j
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分页支持类: QS}=oOR@k
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java代码: $c-3Q|C
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package com.javaeye.common.util; MYDSkW
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import java.util.List; Gm.hBNgp
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publicclass PaginationSupport { ]^y}}y
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publicfinalstaticint PAGESIZE = 30; "{k3~epYaN
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privateint pageSize = PAGESIZE; :.cX3dP@
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privateList items; o;.-I[9h]
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privateint totalCount; #lO;G
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privateint[] indexes = newint[0]; $sJn:
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privateint startIndex = 0; ?,j:Y0l.L
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public PaginationSupport(List items, int *s^5BLI9
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totalCount){ +K?h]v]%
setPageSize(PAGESIZE); F,sT[C
setTotalCount(totalCount); z+b~#f3
setItems(items); /dfZ>k8
setStartIndex(0); Y'-Lt5SCS
} CqoL5qt
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public PaginationSupport(List items, int 3X:F9x>y
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totalCount, int startIndex){ iB?@(10}ES
setPageSize(PAGESIZE); 3 yElN.=
setTotalCount(totalCount); gvC2\k{
setItems(items); Lg^m?~{
setStartIndex(startIndex); \;3r
} _VlNZ/V
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public PaginationSupport(List items, int rLwc=(|
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totalCount, int pageSize, int startIndex){ O!g>
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setPageSize(pageSize); )L{\k$r!EM
setTotalCount(totalCount); )"1D-Bc\Q
setItems(items); h %nZKhm
setStartIndex(startIndex); J=$v+8&.
} $OT:J
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publicList getItems(){ #_E8>;)k
return items; _ReQQti[
} lY 1m%
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publicvoid setItems(List items){ y|p:^41Ro
this.items = items; V><P`
} D,hl+P{^K
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publicint getPageSize(){ 0`x<sjG\q
return pageSize; DgdW.Kj|IL
} '1w<<?vX?
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publicvoid setPageSize(int pageSize){ xWD wg@ P
this.pageSize = pageSize; 8ZN J}
} a%AU9?/q#
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publicint getTotalCount(){ >fjf]
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return totalCount; b#P8Je`;9
} hE=cgO`QU
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publicvoid setTotalCount(int totalCount){ +`[$w<I
if(totalCount > 0){ TqlUe@E
this.totalCount = totalCount; %B~`bUHjq
int count = totalCount / !XFN/-Q ,
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pageSize; ,^+3AT
if(totalCount % pageSize > 0) F/!C=nS
count++; $/D@=Pkc
indexes = newint[count]; 9A6ly9DIS
for(int i = 0; i < count; i++){ y,%w`
indexes = pageSize * ^)SvH
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i; H[Qh* pq2
} >uQ!B/C!
}else{ Yux7kD\c
this.totalCount = 0; 1D*eu
} )X@(>b{
} 5B51^"
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publicint[] getIndexes(){ >Mn"k\j4
return indexes; ]-R8W/fDn
} p@!"x({@l
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publicvoid setIndexes(int[] indexes){ #0mn_#-P)
this.indexes = indexes; ~[[a7$_4
} K,So#Ui
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publicint getStartIndex(){ P[Qr[74)
return startIndex; 4gYP .h:,
} s#d>yx_b
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publicvoid setStartIndex(int startIndex){ 's
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if(totalCount <= 0) '-
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this.startIndex = 0; QZDGk4GG
elseif(startIndex >= totalCount) g'mkhF(
this.startIndex = indexes >8RIMW2
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[indexes.length - 1]; d 5Il0sG
elseif(startIndex < 0) wo?C7,-x
this.startIndex = 0; 1XSqgr"3
else{ R+^/(Ws'<
this.startIndex = indexes @]OI(B
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[startIndex / pageSize]; %2>FSE
} l]%|w]i\
} MY0Wr%@#0
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publicint getNextIndex(){ YGxdYwBwf
int nextIndex = getStartIndex() + R
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pageSize; 4=1lyw
if(nextIndex >= totalCount) F2XXvxG
return getStartIndex(); s cn!,
else P{);$e+b~
return nextIndex; {8t;nsdm!
} ?Ww',e
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publicint getPreviousIndex(){ >(\[ $
int previousIndex = getStartIndex() - Tvk= NJ
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pageSize; dso\+s
if(previousIndex < 0) FCI38?`%
return0; Ad]r )d{
else "+|>nA=7
return previousIndex; BURiLEYZl
} J H$
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} =r
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抽象业务类 jP+4'O!s[
java代码: /AWHG._
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/** $bD!./fl
* Created on 2005-7-12 h7o{l7`)
*/ lMP|$C
package com.javaeye.common.business; + J_W }G
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import java.io.Serializable; EQ7cK63
import java.util.List; Ef7Kx49I
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import org.hibernate.Criteria; O" T1=4
import org.hibernate.HibernateException; I</Nmgf
import org.hibernate.Session; w $2-t
import org.hibernate.criterion.DetachedCriteria; }P^n /
import org.hibernate.criterion.Projections; fV[xv4D.
import z?V > ST
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org.springframework.orm.hibernate3.HibernateCallback;
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import #Xsby
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org.springframework.orm.hibernate3.support.HibernateDaoS m.lNKIknQ
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upport; .%D] z{''
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import com.javaeye.common.util.PaginationSupport; qo'pU/@
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public abstract class AbstractManager extends heRQ|n.Dz)
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HibernateDaoSupport { $|AvT;4
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privateboolean cacheQueries = false; )Q9J,
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privateString queryCacheRegion; ;m;wSp
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publicvoid setCacheQueries(boolean FUMAvVQ
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cacheQueries){ {%~Sbcq4F
this.cacheQueries = cacheQueries; S,J'Z:spf
} 3`-[95w
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publicvoid setQueryCacheRegion(String t+66kB N
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queryCacheRegion){ _{T`ka
this.queryCacheRegion = "%0RR?
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queryCacheRegion; en#W<"_"
} -7\RO%U
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publicvoid save(finalObject entity){ 60QElJ9D
getHibernateTemplate().save(entity); -BNW\]}
} g[!sGa&
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publicvoid persist(finalObject entity){ LgB}!OLQ
getHibernateTemplate().save(entity); 6`%}s3Xq
} ~>)cY{wE_
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publicvoid update(finalObject entity){ C%G-Ye|@
getHibernateTemplate().update(entity); {jr>Z"/q
} 7!Fu.Ps
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publicvoid delete(finalObject entity){ 7dxY07yu
getHibernateTemplate().delete(entity); {dCk iF
} vE{QN<6T
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publicObject load(finalClass entity, 9KCnitU
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finalSerializable id){ /l@ 7MxE
return getHibernateTemplate().load zoO>N'b3)
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(entity, id); gl00$}C
} Ho*S>Y
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publicObject get(finalClass entity, OB5(4TY
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finalSerializable id){ $eI[3{}X
return getHibernateTemplate().get Jd/5Kx
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(entity, id); iZ)7%R?5
} FL0[V,
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publicList findAll(finalClass entity){ %`%1W
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return getHibernateTemplate().find("from ^8E/I]-
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" + entity.getName()); 0d.lF:
} mrk Q20D
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publicList findByNamedQuery(finalString V?%>Ex$
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namedQuery){ "'s`?
return getHibernateTemplate x7t"@Gz
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().findByNamedQuery(namedQuery); aRj3TtFh
} Hm1C|Qb
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publicList findByNamedQuery(finalString query, gXs@FhR0
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finalObject parameter){ QMHeU>
return getHibernateTemplate 9sJbz=o]r
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().findByNamedQuery(query, parameter); T3wR0,
} )` '
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publicList findByNamedQuery(finalString query, kRZ(
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finalObject[] parameters){ Q y$8!(
return getHibernateTemplate }+ I
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().findByNamedQuery(query, parameters); 6'|J
;
} X[grVe
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publicList find(finalString query){ /vSFQ}W
return getHibernateTemplate().find K.*zqQKlI|
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(query); goWD~'\
} Ff%m.A8d,4
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publicList find(finalString query, finalObject eAm7*2
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parameter){ |0A n|18
return getHibernateTemplate().find oKzV!~{0M;
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(query, parameter); t[)z/[m
} ;MNEe%
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public PaginationSupport findPageByCriteria uh`~K6&*\w
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(final DetachedCriteria detachedCriteria){ N~Ax78TX
return findPageByCriteria
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); z&cfFx#h)
} lr,hF1r&Y
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public PaginationSupport findPageByCriteria PY)C=={p
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(final DetachedCriteria detachedCriteria, finalint rQN+x|dKMb
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startIndex){ &hjrJ/'^
return findPageByCriteria 5orA#B
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(detachedCriteria, PaginationSupport.PAGESIZE, ls 'QfJm
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startIndex); q35%t61Lc
} [@Uc4LX
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public PaginationSupport findPageByCriteria Eu1s
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(final DetachedCriteria detachedCriteria, finalint ]
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pageSize, &'T7 ~M:
finalint startIndex){ g7_a8_
return(PaginationSupport) BU]9eF!>h
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getHibernateTemplate().execute(new HibernateCallback(){ )wSsxX7:
publicObject doInHibernate /HI#8
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(Session session)throws HibernateException { Kgk9p`C(
Criteria criteria = "AUY+ LN
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detachedCriteria.getExecutableCriteria(session); Z+I[
int totalCount = [rE,fR
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((Integer) criteria.setProjection(Projections.rowCount j"}alS`-
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()).uniqueResult()).intValue(); N@;6/[8
criteria.setProjection CZ|Y o
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(null); a+r0@eFLc
List items = T"dWrtO
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criteria.setFirstResult(startIndex).setMaxResults V..m2nQj
|]\qI
(pageSize).list(); -L1{0{Z
PaginationSupport ps = !{r Gt`y
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new PaginationSupport(items, totalCount, pageSize, cz&FOP+!
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startIndex); pA1Tod
return ps; |/YT.c%
} *gVRMSrx4
}, true); 3 T&m
} DQKhR sC
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public List findAllByCriteria(final a"#5JcR3
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DetachedCriteria detachedCriteria){ "d%":F(
return(List) getHibernateTemplate o`h F1*yp
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().execute(new HibernateCallback(){
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publicObject doInHibernate M0"xDvQ
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(Session session)throws HibernateException { S(9fGh
Criteria criteria = /v=MGX@r
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detachedCriteria.getExecutableCriteria(session); +r4^oT[-
return criteria.list(); /d8PDc "
} A5Y z|
}, true); 8Qek![3^
} '0/t |V<
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public int getCountByCriteria(final v:s~Y
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DetachedCriteria detachedCriteria){ T4J(8!7
Integer count = (Integer) %3'80u6BCJ
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getHibernateTemplate().execute(new HibernateCallback(){ =#n|t[h-
publicObject doInHibernate a|lcOU
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(Session session)throws HibernateException { p>65(&N,
Criteria criteria = 9M<qk si
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detachedCriteria.getExecutableCriteria(session); Ol D]*=.cO
return @<AyCaU`.
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criteria.setProjection(Projections.rowCount ^5j9WV
fZT=q^26
()).uniqueResult(); F0+ u#/#
} >$?$&+e}
}, true); fh}\#WE"
return count.intValue(); ZIkXy*<(
} /nGsl<
} I tp7X
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用户在web层构造查询条件detachedCriteria,和可选的 qL
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 UR:cBr
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PaginationSupport的实例ps。 oG3>lqBwD2
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ps.getItems()得到已分页好的结果集 a
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ps.getIndexes()得到分页索引的数组 |SQ5 Sb
ps.getTotalCount()得到总结果数 lLS`Ln)"
ps.getStartIndex()当前分页索引 O-}{%)[ F
ps.getNextIndex()下一页索引 gGH<%nHW1
ps.getPreviousIndex()上一页索引 8;-a_VjA)
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 m9a(f >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 E[)`+:G]
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一下代码重构了。 |!aMj8i2
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我把原本我的做法也提供出来供大家讨论吧: +F]X
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首先,为了实现分页查询,我封装了一个Page类: D42Bm&JocO
java代码: a=.A/;|0*
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/*Created on 2005-4-14*/ )F8G q,
package org.flyware.util.page; $NWXn,Y'
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/** TG=) KS
* @author Joa F)z]QJOw
* Uw8O"}U8
*/ 2bPrND\P=
publicclass Page { Rs$k3
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/** imply if the page has previous page */ <w}YD @(f
privateboolean hasPrePage; PxhB=i!'$
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/** imply if the page has next page */ t,gKN^P_
privateboolean hasNextPage; <7~HG(ks
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/** the number of every page */ K.Nun)<
privateint everyPage; e23}'qb
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/** the total page number */ .z^ePZ|mV
privateint totalPage; 6}qp;mR
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/** the number of current page */ l{[{pAm
privateint currentPage; "94e-Nx
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/** the begin index of the records by the current ,_,Z<X/
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query */ $b,o3eC
privateint beginIndex; &U^6N+l9
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/** The default constructor */ V^Z"FwWk
public Page(){ d~M;@<eD
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} fjVGps$j
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/** construct the page by everyPage iG( )"^G
* @param everyPage kq&xH;9=.
* */ u(iEuF;7
public Page(int everyPage){ h;?=:(
this.everyPage = everyPage; *p0n{F9
} P1tc*2Z
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/** The whole constructor */ 1$2'N~`#U
public Page(boolean hasPrePage, boolean hasNextPage, -'ePx f
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int everyPage, int totalPage, | #Z+s-
int currentPage, int beginIndex){ *{5p/}p
this.hasPrePage = hasPrePage; s
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this.hasNextPage = hasNextPage; 3 (Bd`=9
this.everyPage = everyPage; 6g06s @kz
this.totalPage = totalPage; ^NwXvp>7-
this.currentPage = currentPage; \Jq$!foYx
this.beginIndex = beginIndex; ~5g2~.&*
} s$ZzS2d
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/** 53=5xE= `D
* @return +ExXhT
* Returns the beginIndex. @AET.qGC
*/ LE#ko2#ke
publicint getBeginIndex(){ nW#UBtZ
return beginIndex; [*^`rQ
} D_mdX9-~
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/** 6^_:N1@
* @param beginIndex qYjR
* The beginIndex to set. $<'i+kK
*/ aly1=j
publicvoid setBeginIndex(int beginIndex){ 8ExEhBX8
this.beginIndex = beginIndex; 9+><:(,
} av|r^zc
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/** cXP*?N4Cf
* @return I2"F2(>8K
* Returns the currentPage. K`}8fU
*/ 9C9>V]
publicint getCurrentPage(){ ffDh0mDN
return currentPage; 3,;;C(
} XL
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/** W\f u0^
* @param currentPage ,n)f=q*%
* The currentPage to set. BCUn[4Gp
*/ E&js`24 &
publicvoid setCurrentPage(int currentPage){ N_<wiwI<
this.currentPage = currentPage; %#7NCdk;S
} dZ]['y%
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/** >|[ l?`
* @return %2)B.qTp&
* Returns the everyPage. 9&]g2iT P
*/ Z]VmTB
publicint getEveryPage(){ YS$42J_T
return everyPage; _p<]jt
} uUy~$>V
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/** z _A]mJ
* @param everyPage C|or2
* The everyPage to set. j_w"HiNBA
*/ _6O\*|'6
publicvoid setEveryPage(int everyPage){ 4o|-v
this.everyPage = everyPage; OH+kN/Fd
} acG4u+[ ]
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/** Xo,}S\wcn
* @return
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* Returns the hasNextPage. :U>[*zE4&
*/ I;u1mywd
publicboolean getHasNextPage(){ TDqH"q0
return hasNextPage; qhE1
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} :_,oD
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/** @cc4]>4
* @param hasNextPage aFfd!a"n
* The hasNextPage to set. Ej;BI#gx=
*/ '=eG[#gy
publicvoid setHasNextPage(boolean hasNextPage){ J/T$.*X
this.hasNextPage = hasNextPage; r:xbs0
7
} 16pk4f8
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/** >^odV
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* @return Ja`xG{~Y7i
* Returns the hasPrePage. *PSUB{i(
*/ &-e@Et`Pg
publicboolean getHasPrePage(){ ,\]`X7r
return hasPrePage; 8(jUCD
} [>MPM$9F-m
()\=(n!J
/** !Au@\/}
* @param hasPrePage d[( }
* The hasPrePage to set. r9\7I7z
*/ L9"yQD^R7?
publicvoid setHasPrePage(boolean hasPrePage){ 1Uy'TEk
this.hasPrePage = hasPrePage; x@aWvrL
} iCZuE:I1K,
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/** jeu|9{iTVu
* @return Returns the totalPage. <F%c"Rkh
* Dwx^hNh
*/ \H&8.<HJ
publicint getTotalPage(){ CW+] Jv]"
return totalPage; *h V$\CLT.
} G*y!
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/** (p?7-~6|:
* @param totalPage 8hZYZ /T
* The totalPage to set. exP:lO_0n
*/ Md5|j0#p
publicvoid setTotalPage(int totalPage){ qRbU@o.3
this.totalPage = totalPage; xj#anr
} yV4rS6=
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} Uv|?@zy#
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