Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 H^~!t{\
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Bb6_['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 ZZUCwczI
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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 pmZr<xs
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分页支持类: YGB|6p(
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java代码: %rkUy?=vu
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package com.javaeye.common.util; lxbZM9A2
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import java.util.List; mYZH]oo
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publicclass PaginationSupport { 2ma.zI@^u9
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publicfinalstaticint PAGESIZE = 30; GCrMrZ6
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privateint pageSize = PAGESIZE; C]}0h!_V
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privateList items; fYpy5vc-dm
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privateint totalCount; @E1N9 S?>
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privateint[] indexes = newint[0]; _:T\[sz5
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privateint startIndex = 0; rz4S"4
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public PaginationSupport(List items, int b8O:@j2
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totalCount){ MYu-[Hg
setPageSize(PAGESIZE); 2e+DUZBoC
setTotalCount(totalCount); p0b&CrALx
setItems(items); :iq1-Pw
setStartIndex(0); ]itvu :pl%
} lgU7jn
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public PaginationSupport(List items, int nfd^'}$]
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totalCount, int startIndex){ =r`>tWs
setPageSize(PAGESIZE); o)w'w34FCT
setTotalCount(totalCount); S#jE1 EN
setItems(items); { 2-w<t
setStartIndex(startIndex); (ue;O~
} N'IzHyo.
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public PaginationSupport(List items, int azN<]u@.
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totalCount, int pageSize, int startIndex){ ~Xa >;
setPageSize(pageSize); *PD7H9m
setTotalCount(totalCount); i9$
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setItems(items); lBl`R|Gt
setStartIndex(startIndex); RxcX\:
} k |M
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publicList getItems(){ )%P!<|s:5
return items; 2wikk]Z
} [Qr#JJ
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publicvoid setItems(List items){ dQTJC
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this.items = items; t '* L,
} Ee^2stc-
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publicint getPageSize(){ |G }qY5_
return pageSize; J&2cf#
} bt"*@NJ$
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publicvoid setPageSize(int pageSize){ rdSkGb
this.pageSize = pageSize; >E6w,Ab
} p{NVJ^!+
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publicint getTotalCount(){ \'x.DVp
return totalCount; i1}Y;mj
} XC%u`UG
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publicvoid setTotalCount(int totalCount){ qYF150
if(totalCount > 0){ s$s~p
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this.totalCount = totalCount; \$$DM"+:;H
int count = totalCount / 0M-=3 T
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pageSize; f@rR2xZoQ
if(totalCount % pageSize > 0) plN:QS$
count++; f0S$p
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indexes = newint[count]; 9bwG3jn4?
for(int i = 0; i < count; i++){ B
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indexes = pageSize * P-U9FKrt
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i; h&}z@
} ?g+uJf
}else{ WCRGqSr4
this.totalCount = 0; \I"n~h^_
} yGj'0c::
} /fgy 07T
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publicint[] getIndexes(){ Q!.JV.(
return indexes; E &G]R!
} Bc&Y[u-n
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publicvoid setIndexes(int[] indexes){ VYG o;
this.indexes = indexes; ]?c9;U
} #7v=#Jco
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publicint getStartIndex(){ JIL(\d
return startIndex; T]oVNy
} tqk^)c4FF(
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publicvoid setStartIndex(int startIndex){ ?hBj q
if(totalCount <= 0) <*_DC)&79
this.startIndex = 0; yd|ao\'=
elseif(startIndex >= totalCount) ,B 2p\
this.startIndex = indexes Jo'~oZ$
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[indexes.length - 1]; MMU>55+-
elseif(startIndex < 0) me@k~!e"z
this.startIndex = 0; .VXadgM
else{ 5J~@jPU
this.startIndex = indexes
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[startIndex / pageSize]; <g$b M;6%
} 'IQ;;[Q
} 'r'+$D7
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publicint getNextIndex(){ \ v2-}jU(
int nextIndex = getStartIndex() + v`&>m'
\ lW*.<
pageSize; Lky T4HC8n
if(nextIndex >= totalCount) 1EMrXnv,
return getStartIndex(); ^V0I!&7lx
else O[+\` 63F=
return nextIndex; G?+0#?'Y
} Ug#EAV<m
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publicint getPreviousIndex(){ 7Vo[zo
int previousIndex = getStartIndex() - q|_Cj]{
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pageSize; SoHw9FtS
if(previousIndex < 0) a(_3271
return0; NQx>u
else Wgm{
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return previousIndex; >p29|TFbV
} ZMEYF!jN
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} PTpGZ2FZ
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抽象业务类 Of;$
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java代码: r)gtx!bx
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/** snVeOe#'S
* Created on 2005-7-12 ]#\/1!W
*/ |?LUt@r;
package com.javaeye.common.business; Q[.d
PG*FIRDb
import java.io.Serializable; Bg}(Sy
import java.util.List; )QB9zl:
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import org.hibernate.Criteria; *40Z}1ng
import org.hibernate.HibernateException; d[&Ah~,
import org.hibernate.Session; SXRND;-W8
import org.hibernate.criterion.DetachedCriteria; 8 O.5ML{
import org.hibernate.criterion.Projections; l)qGG$7$
import R]y9>5 'U
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org.springframework.orm.hibernate3.HibernateCallback; +\66; 7]s
import ^" 4u1
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org.springframework.orm.hibernate3.support.HibernateDaoS J:2Su1"ODh
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upport; 6'JP%~QlS
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import com.javaeye.common.util.PaginationSupport; Cz#3W8jV
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public abstract class AbstractManager extends DZ&AwF
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HibernateDaoSupport { q^+Z>
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privateboolean cacheQueries = false; FUKE.Uxd
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privateString queryCacheRegion; W'<cAg?
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publicvoid setCacheQueries(boolean :]-? l4(%
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cacheQueries){ n`g:dz
this.cacheQueries = cacheQueries; T(6B,
} f>C|qDmT
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publicvoid setQueryCacheRegion(String T#w *5Qf
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queryCacheRegion){ dM3V2TT
this.queryCacheRegion = M)!:o/!c S
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queryCacheRegion; =Pgu?WU@
} Zc57] ~
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publicvoid save(finalObject entity){ =AJ I3'x
getHibernateTemplate().save(entity); bNO/CD4
} 8yc?9&/|
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publicvoid persist(finalObject entity){ S+C^7# lT
getHibernateTemplate().save(entity); yD!V;?EnK
} :cK;|{f
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publicvoid update(finalObject entity){ DeTZl+qm1E
getHibernateTemplate().update(entity); JSQ*8wDcl
} q3E_.{t
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publicvoid delete(finalObject entity){ g$*VA} s
getHibernateTemplate().delete(entity); !S',V&Yb
} GcPhT
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publicObject load(finalClass entity, ;DKwv}
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finalSerializable id){ E$[\Fk}S
return getHibernateTemplate().load V ;)q?ZHg
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(entity, id); _k@{>
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} bMD'teJ
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publicObject get(finalClass entity, e+F5FAMR68
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finalSerializable id){ [@= [<
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return getHibernateTemplate().get
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(entity, id); (K+TqJw
} v; ;X2 a1k
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publicList findAll(finalClass entity){ `B6{y9J6
return getHibernateTemplate().find("from DwZt.*
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" + entity.getName()); +2w54X%?M
} &hba{!`y
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publicList findByNamedQuery(finalString y+?tUSPP
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namedQuery){ Md
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return getHibernateTemplate *<U&DOYV:
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().findByNamedQuery(namedQuery); lrh6lt)
} g#_?Vxt
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publicList findByNamedQuery(finalString query, .tN)H1.:B
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finalObject parameter){ 4_N)1u !
return getHibernateTemplate @\!wW-:A
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().findByNamedQuery(query, parameter); vtmO
} W'XMC"
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publicList findByNamedQuery(finalString query, fsjA7)/
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finalObject[] parameters){ Hs=!.tZ,
return getHibernateTemplate u."fJ2}l0X
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().findByNamedQuery(query, parameters); g-p
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} 4!k={Pd
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publicList find(finalString query){ v[a#>!;s
return getHibernateTemplate().find -'PpY302
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(query); )1fQhdO}x
} \;7DS:d@
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publicList find(finalString query, finalObject eF8`an5S
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parameter){ Etu>z+P!
return getHibernateTemplate().find BRD'5 1]|
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(query, parameter); n/,7ryu
} btOTDqG`a
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public PaginationSupport findPageByCriteria owMH
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(final DetachedCriteria detachedCriteria){ Q?a"uei[
return findPageByCriteria D} .t
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); f0D Ch]
} Pm1
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public PaginationSupport findPageByCriteria N9n1s2;o
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(final DetachedCriteria detachedCriteria, finalint 'd t}i<
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startIndex){ nUd\4;J#
return findPageByCriteria `5 6QX'?
} )e`0)
(detachedCriteria, PaginationSupport.PAGESIZE, s^oNQ}
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startIndex); KvD$`"L/CT
} q9
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public PaginationSupport findPageByCriteria zl:D|h77
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(final DetachedCriteria detachedCriteria, finalint Pu^~]^W)
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pageSize, +zD'r5
finalint startIndex){ f
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return(PaginationSupport) P\s+2/
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getHibernateTemplate().execute(new HibernateCallback(){ _Y|kX2l
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publicObject doInHibernate 'YR5i^:t
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(Session session)throws HibernateException { ,xz^k/.
Criteria criteria = ->hxHr`!%a
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detachedCriteria.getExecutableCriteria(session); "?{yVu~9
int totalCount = >slN:dr0:
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((Integer) criteria.setProjection(Projections.rowCount l1)pr{A
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()).uniqueResult()).intValue(); Tqa4~|6
criteria.setProjection 8@aS9th$
,&?q}M
(null); @L!#i*> 9
List items = N ]7a=
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criteria.setFirstResult(startIndex).setMaxResults nh=Us^xD
93Gur(j^
(pageSize).list(); $M`;."
PaginationSupport ps = V3W85_*
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new PaginationSupport(items, totalCount, pageSize, )Zf}V0!?+
gyQ9Z}
startIndex); DiQkT R
return ps; 5SL>q`t.bd
} &8AS=v
}, true); 'D"K`Vw
} O|&TL9:
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public List findAllByCriteria(final (I[h.\%
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DetachedCriteria detachedCriteria){ |J Q:.h
return(List) getHibernateTemplate M y"!j,Up
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().execute(new HibernateCallback(){ #KNq:@wp6
publicObject doInHibernate e~s7ggg2k
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(Session session)throws HibernateException { P>T*:!s ;
Criteria criteria = i5<Va@ru!s
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detachedCriteria.getExecutableCriteria(session); 5652'p
return criteria.list(); =@KY A(D
} ;k&k#>L!K
}, true); TnBG MI,g'
} .-u k
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public int getCountByCriteria(final u1|P'>;lF
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DetachedCriteria detachedCriteria){ R`C_CsXir
Integer count = (Integer) %M)oHX1p
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getHibernateTemplate().execute(new HibernateCallback(){ T3t~=b>&L
publicObject doInHibernate S7NnC4)=-f
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(Session session)throws HibernateException { dI
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Criteria criteria = 8
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detachedCriteria.getExecutableCriteria(session); Q"6hD?6.
return E#{WU}
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criteria.setProjection(Projections.rowCount `/wq3+ ?
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()).uniqueResult(); ;[OJ-|Q
} >.O*gv/_
}, true); ;x3 ]4^
return count.intValue(); $XQ;~i
} 61+pryW%g
} ny
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用户在web层构造查询条件detachedCriteria,和可选的 .,ppGc|*
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 0x]OF8=J
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PaginationSupport的实例ps。 ||'i\X|[
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ps.getItems()得到已分页好的结果集 \C+*loLs
ps.getIndexes()得到分页索引的数组 QWzOp\+
ps.getTotalCount()得到总结果数 43{_Y]
ps.getStartIndex()当前分页索引 ^EC)~HP@C
ps.getNextIndex()下一页索引 rF8W(E_=
ps.getPreviousIndex()上一页索引 o8};e
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 :Wyn+
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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 ,Lt~u_ lve
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一下代码重构了。 .])>A')r
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我把原本我的做法也提供出来供大家讨论吧: Sc;iAi
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首先,为了实现分页查询,我封装了一个Page类: lgkl? 0!
java代码: {h/OnBwG
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/*Created on 2005-4-14*/ Kcscz,
package org.flyware.util.page; w?]ZU-
NLcO{
/** YMc8Q\*B
* @author Joa ~q0I7M
* P &;y]
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*/ L.C
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publicclass Page { V,>+G6e
q[{:
/** imply if the page has previous page */ >.DF"]XM
privateboolean hasPrePage; +3M$3w{2
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/** imply if the page has next page */ 89LpklD
privateboolean hasNextPage; ;j>*;Q`
Ad dGB^7yl
/** the number of every page */ AuoxZ?V
privateint everyPage; <U@P=G<t
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/** the total page number */ 'M~BE\
privateint totalPage; 7%{R#$F
5;X {.2
/** the number of current page */ El~-M`Gf
privateint currentPage; PV?]UUc'n<
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/** the begin index of the records by the current `@h:_d
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query */ q^Z~IZ8IT
privateint beginIndex; 'I&|1I^
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! mm5I#s
/** The default constructor */ _e6a8
public Page(){ M(qxq(#{U
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} fs&,w
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/** construct the page by everyPage :bwM]k*$
* @param everyPage 0eFb?Z0]
* */ {]=v]O|,
public Page(int everyPage){ I[ai:
this.everyPage = everyPage; g]za"U|g
} N;<//,
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/** The whole constructor */ sYI~dU2H
public Page(boolean hasPrePage, boolean hasNextPage, 5|{)Z]M%9
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int everyPage, int totalPage, .Y! :x=e
int currentPage, int beginIndex){ Qu`n&
this.hasPrePage = hasPrePage; cqEHYJ;B
this.hasNextPage = hasNextPage; T j`y J!0
this.everyPage = everyPage; 9UP:J0 `
this.totalPage = totalPage; kBbl+1{H
this.currentPage = currentPage; Uan,H1a
this.beginIndex = beginIndex; &eIGF1ws
} J/t!-!
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/** k^^:;OR
* @return H>?F8R_iq
* Returns the beginIndex. I_?He'=0oU
*/ |q_
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publicint getBeginIndex(){ "<*awWNI
return beginIndex; Ib1e#M3
} W
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/** k(vPg,X>m
* @param beginIndex =OYQM<q
* The beginIndex to set. Sj)}qM-y#
*/ H0a-(
publicvoid setBeginIndex(int beginIndex){ 4\p-TPM
this.beginIndex = beginIndex; 2J<&rKCF
} 9cQ_mgch
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/** se!mb _!
* @return {B0h+. C
* Returns the currentPage. i[150g?K
*/ Ax!Gu$K2o
publicint getCurrentPage(){ |y"jZT6R}t
return currentPage; wGJjA=C
} .0|=[|
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/** F>+2DlA`<e
* @param currentPage 5)'P'kVi7.
* The currentPage to set. n|i"S`
*/ s&'BM~WI
publicvoid setCurrentPage(int currentPage){ \iU] s\{).
this.currentPage = currentPage; >qR~'$,$
} )ofm_R'q*
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/** KrKu7]If6#
* @return 7zDiHac
* Returns the everyPage. +a|/l
*/ ?_q+&)4-o
publicint getEveryPage(){ :gI.l1
return everyPage; c8A`<-\MfB
} G>
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/** GBP-V66
* @param everyPage |}[nH>
* The everyPage to set. mm[SBiFO\
*/ 9"sDm}5%
publicvoid setEveryPage(int everyPage){ SwH2$:f
this.everyPage = everyPage; Cca0](R*&
} !gP0ndRJ=
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/** <]G${y*;
* @return f h<*8w0H
* Returns the hasNextPage. K: r\{#9
*/ uQeu4$k!
publicboolean getHasNextPage(){ \cuS>G
return hasNextPage; wW`}VKu
} .q;ED`G
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/** V#83!
* @param hasNextPage 3HiFISA*
* The hasNextPage to set. 2t1I3yA'{z
*/ P7GRSjG
publicvoid setHasNextPage(boolean hasNextPage){ x?r1s#88>
this.hasNextPage = hasNextPage; 6C-YyI#s#
} R+=a`0_S
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/** 61K"(r~
* @return >3D7tK(
* Returns the hasPrePage. 6s xz_f
*/ kv?|'DN
publicboolean getHasPrePage(){ H[Weu
return hasPrePage; &__DJ''+
}
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