Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 &Ohm]g8{2
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 rrBu6\D
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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 r_/=iYYJ
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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 5A(zQ'6
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分页支持类: o|#Mq"od
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java代码: 2D|2/ >[
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package com.javaeye.common.util; ;4XvlcGo
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import java.util.List; e45gjjts
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publicclass PaginationSupport { "[(&$I
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publicfinalstaticint PAGESIZE = 30; .Y B}w
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privateint pageSize = PAGESIZE; Exir?G} \
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privateList items; D4
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privateint totalCount; 5)X;q-
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privateint[] indexes = newint[0]; _-/aMfyQ
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privateint startIndex = 0; C'8v\C9Ag
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public PaginationSupport(List items, int 2uonT,W
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totalCount){ p<>xqU
setPageSize(PAGESIZE); jtqH3xfy
setTotalCount(totalCount); e1Kxqw7
setItems(items); 9 [qEJ$--
setStartIndex(0); ::13$g=T9s
} 2kg<O%KA`c
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public PaginationSupport(List items, int %ux%=@%
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totalCount, int startIndex){ -dX{ R_*
setPageSize(PAGESIZE); |Z%I3-z_DS
setTotalCount(totalCount); Xk#"rM< Y
setItems(items); @\-i3EhR
setStartIndex(startIndex); J6x#c`Y
} yn&AMq
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public PaginationSupport(List items, int >~O36q^w
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totalCount, int pageSize, int startIndex){ +$]eA'Bh@
setPageSize(pageSize); TBq;#+1W
setTotalCount(totalCount); |n9~2R
setItems(items); I5RV:e5b
setStartIndex(startIndex); 9o-fI@9
} !N5+.E0j
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publicList getItems(){ vfID@g`!q+
return items; cd8ZZ8L
} Qd~M;L O"i
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publicvoid setItems(List items){ M%=V vE.I
this.items = items; oK3uGPi
} % : ?_N
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publicint getPageSize(){ vIBVp
return pageSize; Jvi"K
} c&zZsJ"~
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publicvoid setPageSize(int pageSize){ "=~P&Mi_
this.pageSize = pageSize; Fy4jujP<
} -fF1vJ7L
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publicint getTotalCount(){ npcB+6
return totalCount; ]TTX<R
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} F8 *e
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publicvoid setTotalCount(int totalCount){ HVb9YU+
if(totalCount > 0){ h&|wqna
this.totalCount = totalCount; }z/;^``
int count = totalCount / rE?(_LI
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pageSize; s3m]rC
if(totalCount % pageSize > 0) ?h`Ned0P
count++; ] iKFEd
indexes = newint[count]; BKoc;20;
for(int i = 0; i < count; i++){ 1FfdW>ay*
indexes = pageSize * $V"NB`T
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} $YDZtS&h
}else{ X1* 6qd+E
this.totalCount = 0; by*>w/@9)k
} JyPsRpi\
} 2N]u!S ;d
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publicint[] getIndexes(){ U^_'e_)
return indexes; .y7&!a35
} c"aiZ(aP
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publicvoid setIndexes(int[] indexes){ Ph&AP*Fq
this.indexes = indexes; 3[Pa~]yS
} ?f+w:FO
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publicint getStartIndex(){ y<YVb@O.
return startIndex; AYHfe#!
} i<D}"h|
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publicvoid setStartIndex(int startIndex){ 4XL*e+UfJ
if(totalCount <= 0) ]2n&DJu
this.startIndex = 0; t+0&B"
elseif(startIndex >= totalCount) ^G63GYh]y
this.startIndex = indexes .%+`e
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[indexes.length - 1]; fShf4G_w\
elseif(startIndex < 0) 5(>m=ef"
this.startIndex = 0; r6]r+!63"
else{ '#t"^E2$
this.startIndex = indexes cl2@p@av
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[startIndex / pageSize]; aEX;yy*
} 1oo'\
} 3P/T`)V
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publicint getNextIndex(){ ;: Hfkyy]
int nextIndex = getStartIndex() + {a_=4a
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pageSize; >0+m
if(nextIndex >= totalCount) 133lIX+(k
return getStartIndex(); 5<4njo?k
else {#q<0l
return nextIndex; .D^k0V
} 2U>1-p&dn
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publicint getPreviousIndex(){ -9-%_=6
int previousIndex = getStartIndex() - xpFu$2T6P.
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pageSize; UuT>qWxQ8
if(previousIndex < 0)
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return0; 3Q[]lFJ}F
else M O* m@
return previousIndex; ?C.C?h6F5B
} Mim 9C]h(
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} hr@KWE`
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抽象业务类 P>L-,R(7e
java代码: }<FBcc(n
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/** 4,FkA_k
* Created on 2005-7-12 %S>lPt
*/ ,k{{ZP
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package com.javaeye.common.business; \I#lLP
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import java.io.Serializable; ]ZO^@sH
import java.util.List; !i_5XcH
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import org.hibernate.Criteria; aChY5R
import org.hibernate.HibernateException; lqqY5l6j
import org.hibernate.Session; ReKnvF~
import org.hibernate.criterion.DetachedCriteria; 8XX,(k_b
import org.hibernate.criterion.Projections; K"Nq_Ddwd
import :Iwe> ;}
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org.springframework.orm.hibernate3.HibernateCallback; nImRU.;P
import
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org.springframework.orm.hibernate3.support.HibernateDaoS ,n &|+&
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upport; e[915Q _
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import com.javaeye.common.util.PaginationSupport; 2c0eh-Gf
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public abstract class AbstractManager extends 7_#v_ A^
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HibernateDaoSupport { 6xnJyEQUM
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privateboolean cacheQueries = false; ixiRFBUcF~
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privateString queryCacheRegion; w'M0Rd]
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publicvoid setCacheQueries(boolean |V!A!tB
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cacheQueries){ s.zH.q,
this.cacheQueries = cacheQueries; F\-qXSA
} .RJvu$U2j
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publicvoid setQueryCacheRegion(String =*Wl;PI'
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queryCacheRegion){ e;rs!I!Yw
this.queryCacheRegion = y*Ex5N~JC
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queryCacheRegion; +|#sF,,X4g
} 2U~oWg2P
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publicvoid save(finalObject entity){ s)/i_Oe$\
getHibernateTemplate().save(entity); ,Hys9I
} v%zI~g.L
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publicvoid persist(finalObject entity){ ?A62VV51CN
getHibernateTemplate().save(entity); G-"#3{~2
} *#UDMoz<
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publicvoid update(finalObject entity){ e5`{*g$i).
getHibernateTemplate().update(entity); A.WJ#1i}E
} 1grrb&K
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publicvoid delete(finalObject entity){ puXJ:yo(
getHibernateTemplate().delete(entity); y"@~5e477$
} I|WBT
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publicObject load(finalClass entity, &
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finalSerializable id){ 5^*
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return getHibernateTemplate().load X/gh>MJJ<
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(entity, id); p' /$)klt
} >2VB.f
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publicObject get(finalClass entity, }s{zy:1O
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finalSerializable id){ z)|56
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return getHibernateTemplate().get r T*:1
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(entity, id); DeXnE$XH
} ? `FI!3j
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publicList findAll(finalClass entity){ d54>nycU~N
return getHibernateTemplate().find("from .P ,\69g~A
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" + entity.getName()); G VEjB;
} u{>5
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publicList findByNamedQuery(finalString Nu9mK
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namedQuery){ Y/@4|9!
return getHibernateTemplate _v2FXm
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().findByNamedQuery(namedQuery); $fnFi|-
} R
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publicList findByNamedQuery(finalString query, :_Ng`b/
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finalObject parameter){ ! *pK#
return getHibernateTemplate Q'Q+mt8u5
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().findByNamedQuery(query, parameter); vaK$j!%FE
} \f{C2d/6j
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publicList findByNamedQuery(finalString query, AeUwih.
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finalObject[] parameters){ O 6A:0yM4
return getHibernateTemplate 2!" N9Adt
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().findByNamedQuery(query, parameters); y!aq}YS
} ]Ff&zBJ
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publicList find(finalString query){ F*I{?NRN1
return getHibernateTemplate().find 0Y!Bb2m
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(query); YtIJJH
} <cepRjDn
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publicList find(finalString query, finalObject 9IIe:
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parameter){ p=7kFv
return getHibernateTemplate().find >#0yd7BST
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(query, parameter); Sf*VkH
} ,VHvQU
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public PaginationSupport findPageByCriteria %A W
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(final DetachedCriteria detachedCriteria){ wF38c]r`\<
return findPageByCriteria &:{|nDT_2
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); _Thc\{aV#
} NTVG'3o
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public PaginationSupport findPageByCriteria o.k#|q
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(final DetachedCriteria detachedCriteria, finalint lWOB!l
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startIndex){ ;J?!D x
return findPageByCriteria Lb/a_8<E?
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(detachedCriteria, PaginationSupport.PAGESIZE, Txw,B2e)>
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startIndex); *M KVm)Iv
} {d7KJmN
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public PaginationSupport findPageByCriteria q+LjWZ+O
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(final DetachedCriteria detachedCriteria, finalint +F67g00T|
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pageSize, qe\j$Cjy
finalint startIndex){ Wxp^*._q3I
return(PaginationSupport) ^. Pn)J
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getHibernateTemplate().execute(new HibernateCallback(){ k,q` ^E8k
publicObject doInHibernate O
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(Session session)throws HibernateException { ][qZOIk@
Criteria criteria = Q$RP2&
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detachedCriteria.getExecutableCriteria(session); %7V?7BE
int totalCount = jP}N^
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((Integer) criteria.setProjection(Projections.rowCount >GZF\ER
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()).uniqueResult()).intValue(); EzthRe9
criteria.setProjection GU"MuW`u2
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(null); =@ON>SmPs
List items = *4.f*3*
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criteria.setFirstResult(startIndex).setMaxResults 2gFQHV
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(pageSize).list(); uHwuw_eK`
PaginationSupport ps = My5X%)T>P
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new PaginationSupport(items, totalCount, pageSize, NG b`f-:jw
9`vse>,-hg
startIndex); -98bX]8
return ps; s!UC{)g,
} X|.X4fs
}, true); /+66y=`UJ
} /=-E`%R}!
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public List findAllByCriteria(final @c.QrKSaD
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DetachedCriteria detachedCriteria){ tc#
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return(List) getHibernateTemplate guf+AVPno
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().execute(new HibernateCallback(){ $Y ]*v)}X
publicObject doInHibernate qnT:x{o
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(Session session)throws HibernateException { @Yt[%tOF+
Criteria criteria = Lp{l&-uQ
j[=f;&1
detachedCriteria.getExecutableCriteria(session); q 2=^l
return criteria.list(); LWIU7dw
} ]aaHb
}, true); [9$>N
} ;Hm\?n)a
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public int getCountByCriteria(final f#5mX&j
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DetachedCriteria detachedCriteria){ 7Qq>?H -
Integer count = (Integer) ^
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getHibernateTemplate().execute(new HibernateCallback(){ i@d!g"tot
publicObject doInHibernate zJ@f {RWZa
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(Session session)throws HibernateException { "_5av!;A
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Criteria criteria = BeplS
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detachedCriteria.getExecutableCriteria(session); <hS >L1ZSr
return 9BHl2<&V
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criteria.setProjection(Projections.rowCount uT;9xV%ch
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()).uniqueResult(); TrHBbyqk
} eaCEZHr$
}, true); hp[8.Z$7
return count.intValue(); Aja'`Mu
} k.0$~juu
} +fKLCzj
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用户在web层构造查询条件detachedCriteria,和可选的 JJ[J'xl@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 K _y;<a]
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PaginationSupport的实例ps。 =SLJkw&w6
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ps.getItems()得到已分页好的结果集 Tw|=;m
ps.getIndexes()得到分页索引的数组 KS%xo6k.
ps.getTotalCount()得到总结果数 Is%-r.i
ps.getStartIndex()当前分页索引 u,/PJg-(!
ps.getNextIndex()下一页索引 Q%KS$nP9
ps.getPreviousIndex()上一页索引
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 %hOe `2#$
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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 Vx?a&{3]-
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一下代码重构了。 wVw3YIN#
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我把原本我的做法也提供出来供大家讨论吧: ~
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首先,为了实现分页查询,我封装了一个Page类: &e2") 4oh
java代码: 1oodw!hW
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/*Created on 2005-4-14*/ "EhA _ =i
package org.flyware.util.page; 6XB9]it6
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/** oXb}6YC
* @author Joa [% YCupr#
* o^5xCK:Oi2
*/ iQs(Dh=*
publicclass Page { dt;R
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/** imply if the page has previous page */ )I`B+c:
privateboolean hasPrePage; F8/4PB8-
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/** imply if the page has next page */ 265df
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privateboolean hasNextPage; (w)Qt/P^4
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/** the number of every page */ E}4R[6YD
privateint everyPage; E+F!u5u
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/** the total page number */ E3sl"d;~
privateint totalPage; Z*x Q"+\
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/** the number of current page */ A"i40 @+
privateint currentPage; XeJx/'9o{
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/** the begin index of the records by the current ZShRE"`
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query */ yj"+!g
privateint beginIndex; 8@Y]dzgjj
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