Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 )o`[wq
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 3-v&ktD&N'
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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 P{+,?X\
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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 8DGPA
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分页支持类: noZ!j>f{@l
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java代码: XIBm8IkF
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package com.javaeye.common.util; ~B\O{5W
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import java.util.List; g&r3;
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publicclass PaginationSupport { 9Ecc~'f
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publicfinalstaticint PAGESIZE = 30; ib%'{?Q.
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privateint pageSize = PAGESIZE; w0P Atu
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privateList items; ^Eif~v
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privateint totalCount; SZD7"m4
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privateint[] indexes = newint[0]; vD76IG j m
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privateint startIndex = 0; 3w}ul~>j
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public PaginationSupport(List items, int w* \JA+
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totalCount){ :u`gjj$:s
setPageSize(PAGESIZE); ,wZq~;2
setTotalCount(totalCount); 4ufT-&m};s
setItems(items); *nB-]
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setStartIndex(0); "#P#;]\ `
} tQE<'94A
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public PaginationSupport(List items, int 7QdboEa
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totalCount, int startIndex){ Ys]cJ]
setPageSize(PAGESIZE); -_BX\iP{
setTotalCount(totalCount); cq~~a(IS
setItems(items); +zf`_1+)U
setStartIndex(startIndex); %gu |
} C:.>*;?7
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public PaginationSupport(List items, int QYps5zcn
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totalCount, int pageSize, int startIndex){ y#FFxSH>
setPageSize(pageSize); @$1jp4c
setTotalCount(totalCount); rP IAu[],g
setItems(items); Kf# iF*
setStartIndex(startIndex); xy-Vw"I[bh
} Q%W>m0%
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publicList getItems(){ VNwOD-b/]
return items; 5DJ!:QY!
} hcoZ5!LvT
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publicvoid setItems(List items){ xAr&sGMA
this.items = items; )JhB!P(
} R-tZC9
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publicint getPageSize(){ U$WGe >,
return pageSize; U6#9W}CE
} %WPyc%I
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publicvoid setPageSize(int pageSize){ B &
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this.pageSize = pageSize; n7.85p@ua
} f^lhdZ\
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publicint getTotalCount(){ qWS"I+o,S
return totalCount; #'y&M t
} ul]hvK{2
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publicvoid setTotalCount(int totalCount){ EFv^uve
if(totalCount > 0){ 8?ip,Q\
this.totalCount = totalCount; 9\uBX.]x
int count = totalCount / [#%@,C
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pageSize; I~4!8W-Y
if(totalCount % pageSize > 0) i,rX.K}X
count++; +&G]\WX<
indexes = newint[count]; X6=o vm
for(int i = 0; i < count; i++){ LTuT"}dT[
indexes = pageSize * c4.2o<(Xt
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} sl:1P^b
}else{ :q~5Xw/
this.totalCount = 0; VAA="yN
} <fHN^O0TS
} `3*QKi$
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publicint[] getIndexes(){ yq[.
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return indexes; z:=E-+
} :<HLw.4O
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publicvoid setIndexes(int[] indexes){ YMVmpcz
this.indexes = indexes; 6{I6'+K~
} ;U#=H9_
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publicint getStartIndex(){ [=cYsW%WG
return startIndex; Awr(}){
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publicvoid setStartIndex(int startIndex){ ibLx'<
if(totalCount <= 0) |.;]e[&
this.startIndex = 0; H;0K4|I
elseif(startIndex >= totalCount) DVf}='en8
this.startIndex = indexes 5n1`$T.WG
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[indexes.length - 1]; VQ8Fs/Zt!
elseif(startIndex < 0) xVRxKM5 {
this.startIndex = 0; 8#[2]1X^8
else{ v]rbm}uU9
this.startIndex = indexes /PbMt
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[startIndex / pageSize]; z]D/Qr
} {$>.I
} BAi`{?z$<
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publicint getNextIndex(){ 8_pyfb
int nextIndex = getStartIndex() + nJ$2RN
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pageSize; C-g,uARX(r
if(nextIndex >= totalCount) /1_O5'5+v
return getStartIndex(); wPq9`9 #
else .hUlI3z9
return nextIndex; pE%*r@p4&4
} %:j`%F;R
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publicint getPreviousIndex(){ 9W,%[
int previousIndex = getStartIndex() - JeF$ W!!{
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pageSize; 3i\Np =
if(previousIndex < 0) 9|Ylv:sR
return0; X_!km-{
else h50]%tp\
return previousIndex; #m;o)KkH$r
} 4iZg2"[D
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} ?9>wG7cps7
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抽象业务类 C6Cr+TScH
java代码: Ikw.L
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/** lr?SL\D
* Created on 2005-7-12 2R,8q0qR:
*/ X|D-[|P
package com.javaeye.common.business; M8$eMS1
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import java.io.Serializable; h<bhH=6~
import java.util.List; ~gHn>]S0
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import org.hibernate.Criteria; Z9|A"[b
import org.hibernate.HibernateException; s0:M'wA
import org.hibernate.Session; j@Pd"
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import org.hibernate.criterion.DetachedCriteria; 7GS4gSd3
import org.hibernate.criterion.Projections; 1hSV/%v_
import Z>3m-:-e
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org.springframework.orm.hibernate3.HibernateCallback; ?\(qA+iP0
import m*YfbOhs#
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org.springframework.orm.hibernate3.support.HibernateDaoS #)@#Qd
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upport; sKJr34
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import com.javaeye.common.util.PaginationSupport; 2 |JEGyDS-
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public abstract class AbstractManager extends 587;2
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HibernateDaoSupport { fK *l?Hr
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privateboolean cacheQueries = false; g$zGiqzMK
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privateString queryCacheRegion; vVIND
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publicvoid setCacheQueries(boolean +6$-"lf
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cacheQueries){ o`!#io
this.cacheQueries = cacheQueries; |"S#uJW
} >Vg [A
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publicvoid setQueryCacheRegion(String l9OpaOVfJ
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queryCacheRegion){ Qe-Pg^PS]
this.queryCacheRegion = D~Ef%!&
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queryCacheRegion; pzoh9}bue
} ]9)iBvQlj
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publicvoid save(finalObject entity){ 6 eu7&Kj'
getHibernateTemplate().save(entity); 0rz1b6F5,
} *po
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publicvoid persist(finalObject entity){ iSR"$H{
getHibernateTemplate().save(entity); BFhEDkk
} "A&A?%
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publicvoid update(finalObject entity){ *3!r &iY
getHibernateTemplate().update(entity); w!v^6[!
} NZa 7[}H
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publicvoid delete(finalObject entity){ JbJ!,86
getHibernateTemplate().delete(entity); Kf}*Ij
} 43-Bx`6\
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publicObject load(finalClass entity, $Dx*[.M3>
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finalSerializable id){ ARt{ 2|
return getHibernateTemplate().load !8T04988j
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(entity, id); hN~H8.g
} '+Z Jf&Ox
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publicObject get(finalClass entity, *s-s1v
);_ /0:
finalSerializable id){ oU @!R
return getHibernateTemplate().get 2+DK:T[
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(entity, id); EJMd[hMhe
} r<Z .J/a
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publicList findAll(finalClass entity){ 'q_ Z
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return getHibernateTemplate().find("from 2boyBz}=S
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" + entity.getName()); .-![ ra
} ],[<^=|
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publicList findByNamedQuery(finalString ?e4H{Y/M
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namedQuery){ 8~t8^eBg
return getHibernateTemplate
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().findByNamedQuery(namedQuery); 5h^BXX|Y*
} K(lSR
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publicList findByNamedQuery(finalString query, H!hd0.
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finalObject parameter){ | 4}Y:d
return getHibernateTemplate %4F\#" A
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().findByNamedQuery(query, parameter); hmOGteAf-
} J Eo;Fx]
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publicList findByNamedQuery(finalString query, MzgP@tB
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finalObject[] parameters){ V|B4lGS&
return getHibernateTemplate Zi7cp6~7
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().findByNamedQuery(query, parameters); \'[tfSB
} Ii5U)"
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publicList find(finalString query){ dlCiqY:}
return getHibernateTemplate().find E`(=n(Qu
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(query); _yR_u+5
} ;|oft-y
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publicList find(finalString query, finalObject q+oc^FD?@
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parameter){ 42tZBz&
return getHibernateTemplate().find vqQ)Pu?T
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(query, parameter); ~|Ln9f-g
} H25Qx;(dTk
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public PaginationSupport findPageByCriteria gp{C89gP
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(final DetachedCriteria detachedCriteria){ /5"T46jD
return findPageByCriteria d0ht*b
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Xx[,n-rA
} }2e s"
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public PaginationSupport findPageByCriteria rO.[/#p\
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(final DetachedCriteria detachedCriteria, finalint cLwnV.
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startIndex){ EmrkaV-?k
return findPageByCriteria X=abaKl
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(detachedCriteria, PaginationSupport.PAGESIZE, "+7E9m6I
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startIndex); o3|4PAA/
} PH:5
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public PaginationSupport findPageByCriteria p U !:
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(final DetachedCriteria detachedCriteria, finalint .N.RpRz{f
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pageSize, +a|Q)Ob
finalint startIndex){ P*7G?
return(PaginationSupport) G rU`;M"
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getHibernateTemplate().execute(new HibernateCallback(){ BgUp~zdo
publicObject doInHibernate z_R^C%0k
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(Session session)throws HibernateException { un~`|
Criteria criteria = l5VRdZ4Uf
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detachedCriteria.getExecutableCriteria(session); ,lvG5B\0
int totalCount = :2==7u7v?
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((Integer) criteria.setProjection(Projections.rowCount %s+'"E"E
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()).uniqueResult()).intValue(); /t7f5mA
criteria.setProjection g~.#.S ds
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(null); P;z\vq<h
List items = C"**>OGe
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criteria.setFirstResult(startIndex).setMaxResults `|Di?4+6%
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(pageSize).list(); *'A*!=5(
PaginationSupport ps = 'SlZ-SdR
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new PaginationSupport(items, totalCount, pageSize, 3~3tjhw;]9
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startIndex); @M-w8!.~
return ps; }}]Lf 3;
} _Y&.Nw
}, true); 6=$<R4B
} V-go?b`
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public List findAllByCriteria(final |X A0F\
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DetachedCriteria detachedCriteria){ R59iuHQ[
return(List) getHibernateTemplate m^qFaf)6
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().execute(new HibernateCallback(){ %}zkmEY.e
publicObject doInHibernate 4D<C;>*/b
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(Session session)throws HibernateException { U*Y]cohh
Criteria criteria = 2/V%jS[4#y
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detachedCriteria.getExecutableCriteria(session); a5ZXrWv
return criteria.list(); ?uL-qsU
} x X3I`
}, true); Q[NoFZ
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} ~>9G\/u j
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public int getCountByCriteria(final 9,_~qWw
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DetachedCriteria detachedCriteria){ 8+gp"!E
Integer count = (Integer) j?|Vx'
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getHibernateTemplate().execute(new HibernateCallback(){ :fL7"\
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publicObject doInHibernate K.wRz/M&g
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(Session session)throws HibernateException { >5kz#|@P
Criteria criteria = F5cNF5
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detachedCriteria.getExecutableCriteria(session); :P2!& W
return <^5$))r
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criteria.setProjection(Projections.rowCount 8[X"XThj
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()).uniqueResult(); zo"L9&Hzo
} gvWgw7z
}, true); /LWk>[Z;
return count.intValue(); ;-py h(
}
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} L7(FDv,?
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用户在web层构造查询条件detachedCriteria,和可选的 VvP: }yJ
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 :^{KY(3
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PaginationSupport的实例ps。 aLm~.@Q
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ps.getItems()得到已分页好的结果集 lv!j
ps.getIndexes()得到分页索引的数组 T>(X`(
ps.getTotalCount()得到总结果数 v8 =#1YB;
ps.getStartIndex()当前分页索引 vO9=CCxvq
ps.getNextIndex()下一页索引 Y0lLO0'
ps.getPreviousIndex()上一页索引 IZ>l
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 v07A3oj
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 af@a /
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一下代码重构了。 GQYn |vm
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我把原本我的做法也提供出来供大家讨论吧: /2=9i84
PDS( /x&
首先,为了实现分页查询,我封装了一个Page类: 7@gH{p1
java代码: Q wG_-
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/*Created on 2005-4-14*/ aizws[C
package org.flyware.util.page; }[!=O+gO
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/** )XSHKPTQ1
* @author Joa T&6>Eb0{
* .Y7Kd+)s)L
*/ SOsz=bVx
publicclass Page { (m!kg
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/** imply if the page has previous page */ Ue;Z)}
privateboolean hasPrePage; (r?hD*2r
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/** imply if the page has next page */
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privateboolean hasNextPage; Y$,~"$su|
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/** the number of every page */ x4LPrF1
privateint everyPage; YGQ/zB^Pj
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/** the total page number */ 8,h!&9
privateint totalPage; 29G el
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/** the number of current page */ alzdYiGf
privateint currentPage; tXrKC
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/** the begin index of the records by the current ,']CqhL6=R
(
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query */ kFkI[WKyZ
privateint beginIndex; W58?t6!
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/** The default constructor */ l SKq
public Page(){ d:A'|;']
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} 5"b1:
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/** construct the page by everyPage 0'A"]6
* @param everyPage |[#Qk 4Ttf
* */ %o\+R0K
public Page(int everyPage){ ~-H3]
this.everyPage = everyPage; ?771e:>S-
} b=sY%(2s
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/** The whole constructor */ HWFTI /]
public Page(boolean hasPrePage, boolean hasNextPage, *(vh |
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xtai;
int everyPage, int totalPage, ,S(Z\[x0
int currentPage, int beginIndex){ Hq>hnCT
this.hasPrePage = hasPrePage; c]U+6JH
this.hasNextPage = hasNextPage; YE*|KL^
this.everyPage = everyPage; K7{B!kX4k
this.totalPage = totalPage; \BfMCA/
this.currentPage = currentPage; u~FVI
this.beginIndex = beginIndex; Oop6o$k
} lJfk4 -;M
^ @=4HtA
/** lqrI*@>Tz
* @return ,1CmB@
* Returns the beginIndex. * Z)j"i
*/ 4|Y1W}!0/
publicint getBeginIndex(){ 1Lje.%(E.
return beginIndex; dS Tyx#o
} ~9k E.
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/** s%vy^x29
* @param beginIndex qW4\t
* The beginIndex to set. >Sw?F&
*/ ra^%__N}
publicvoid setBeginIndex(int beginIndex){ #k d9}
this.beginIndex = beginIndex; :nl,Ac
} sEfT#$ a^8
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/** >y#qn9rV1
* @return pih 0ME}z
* Returns the currentPage. r.Z g<T
*/ e9Gu`$K
publicint getCurrentPage(){ ?+Vi
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return currentPage; H13\8Te{
} %B1TN#KoT
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/** T <k;^iqR
* @param currentPage D-i, C~W
* The currentPage to set. 6'uCwAQU
*/ X$Q.A^9
publicvoid setCurrentPage(int currentPage){ 726UO#*
this.currentPage = currentPage; L"S2+F)n
} >PQ?|Uk
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