Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 X~ AE??
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Z,~EH
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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 Q]q`+ Z65
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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 Q[+o\{ O
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分页支持类: XCGJ~
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java代码: q5irKT*Hs
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package com.javaeye.common.util; /GK1}h
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import java.util.List; <4gT8kQ$x
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publicclass PaginationSupport { a|*{BlY
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publicfinalstaticint PAGESIZE = 30; Qz+hS\yx
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privateint pageSize = PAGESIZE; iI27N'g
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privateList items; ]vJ]
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privateint totalCount; O<0G\sU
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privateint[] indexes = newint[0]; Ylc[ghx
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privateint startIndex = 0; ,DN>aEu1
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public PaginationSupport(List items, int 0]C~CvO
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totalCount){ U*.Wx0QM
setPageSize(PAGESIZE); Q3t9J"=1g
setTotalCount(totalCount); u? a*bW
setItems(items); vI<n~FHt
setStartIndex(0); zj ;'0Zu
} 6]=$c<.&
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public PaginationSupport(List items, int oT5N_\
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totalCount, int startIndex){ ,)u\G(N
setPageSize(PAGESIZE); > .L\ >
setTotalCount(totalCount); VP|ga}(
setItems(items); G@Z,Hbgm
setStartIndex(startIndex); 1gEeZ\B-&
} |IbCN
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public PaginationSupport(List items, int Zrtyai{8l
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totalCount, int pageSize, int startIndex){ >[]@Df,p
setPageSize(pageSize); kY8aK8M
setTotalCount(totalCount); v(+9&
setItems(items); >z'kCv
setStartIndex(startIndex); xEt".K
} c2aX_ "
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publicList getItems(){ mM| 313
return items; KZFnp=i
} h|^RM*x
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publicvoid setItems(List items){ fiuF!<#;6
this.items = items; ys+ AY^/
} E1(2wJ-3"
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publicint getPageSize(){ 3urL*Fw,
return pageSize; U$;FOl
} Bnju_)U5)
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publicvoid setPageSize(int pageSize){ =+K2`=y;WF
this.pageSize = pageSize; %E\&9,
} |a7W@LVYD
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publicint getTotalCount(){ ?&Zfb
return totalCount; )<w`E{q
} cVHv>nd#
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publicvoid setTotalCount(int totalCount){ @<$-*,
if(totalCount > 0){ qd@x#"qT
this.totalCount = totalCount; O>YXvu
int count = totalCount / 7M~w05tPh
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pageSize; wB(A['k
if(totalCount % pageSize > 0) N1dp%b9W(
count++; y'ZRoakz)
indexes = newint[count]; _wa1R+`_
for(int i = 0; i < count; i++){ W'f{u&<
indexes = pageSize * .8[Db1W
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} 8mM^wT
}else{ `^t0379e
this.totalCount = 0; d|UK=B^x
} o$k1&hyH
} Ol8ma`}Nq3
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publicint[] getIndexes(){ ~~h@(2/Q>x
return indexes; ?eUhHKS5
} -rYOx9P4
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publicvoid setIndexes(int[] indexes){ 3Lx]-0h
this.indexes = indexes; ,z6&k
} HtWuZq;w
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publicint getStartIndex(){ n !ty\E
return startIndex; X|Gsf=
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} ") Xy%C`J
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publicvoid setStartIndex(int startIndex){ tlo"tl_]
if(totalCount <= 0) jPG&Ypm1
this.startIndex = 0; b[<Q_7~2
elseif(startIndex >= totalCount) pVTx#rY
this.startIndex = indexes u@v0I$
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[indexes.length - 1]; T7E9l
elseif(startIndex < 0) ve.rpF\
this.startIndex = 0; qV57P6<
else{ SWujj,-[
this.startIndex = indexes y:Ycn+X.
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[startIndex / pageSize]; [([?+Ouy
} k8E'wN
} <5*cc8
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publicint getNextIndex(){ v@bs4E46e
int nextIndex = getStartIndex() + YnZV.&4{
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pageSize; ,}%+5yH
if(nextIndex >= totalCount) Z IfhC'
return getStartIndex();
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else c!@g<<}[(
return nextIndex;
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} i>gbT+*E!
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publicint getPreviousIndex(){ =VkbymIZ4y
int previousIndex = getStartIndex() - N_TWT&o4
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pageSize; d)m+Hc.
if(previousIndex < 0) &-#!]T-P:E
return0; aNgaV$|2a
else xk=5q|u_-
return previousIndex; T1ZAw'6(K
} +o)o4l%3
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} 0sW=;R2
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抽象业务类 p(/PG+
java代码: XiE
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/** nff&~lwhZ
* Created on 2005-7-12 [4'C4Zl
*/ p
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package com.javaeye.common.business; 1wpT"5B
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import java.io.Serializable; qh;ahX~
import java.util.List; wS"[m>.{v
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import org.hibernate.Criteria; 24Lo.
import org.hibernate.HibernateException; \"B oTi'2!
import org.hibernate.Session; y\&GPr
import org.hibernate.criterion.DetachedCriteria; Gv(bD6Rz
import org.hibernate.criterion.Projections; JFe %W?}.D
import +9db1:
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org.springframework.orm.hibernate3.HibernateCallback; 8:hUj>qx
import 7:x%^J+
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org.springframework.orm.hibernate3.support.HibernateDaoS L|4kv
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upport; dj,7lJy
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import com.javaeye.common.util.PaginationSupport; DI O @Zo
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public abstract class AbstractManager extends }Th":sin},
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HibernateDaoSupport { &>kklP
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privateboolean cacheQueries = false; Am=D kkP%
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privateString queryCacheRegion; !&@t
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publicvoid setCacheQueries(boolean #%OS=.V
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cacheQueries){ - \ew,y
this.cacheQueries = cacheQueries; F60m]NUM)c
} #Ak9f-pf
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publicvoid setQueryCacheRegion(String 0s}gg[lj
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queryCacheRegion){ Dp^=% F{t
this.queryCacheRegion = Xfg?\j/
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queryCacheRegion; Ln\Gv/)
} |
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publicvoid save(finalObject entity){ kqC7^x
getHibernateTemplate().save(entity); cauKG@:2F
} wb]Z4/j#
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publicvoid persist(finalObject entity){ 0PUSCka'6
getHibernateTemplate().save(entity); "zFTPL"
} <
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publicvoid update(finalObject entity){ |*]<*qnZt
getHibernateTemplate().update(entity); ~"R;p}5"
} 6-{wo)p
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publicvoid delete(finalObject entity){ HXqG;Fds(
getHibernateTemplate().delete(entity); YB]^Y^" e
} MP
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publicObject load(finalClass entity, JVPLE*T
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finalSerializable id){ _]+
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return getHibernateTemplate().load D r6u0rx8
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(entity, id); dW|S\S'&
} _ukBp*u
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publicObject get(finalClass entity, ?SoRi</1
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finalSerializable id){ K7
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return getHibernateTemplate().get re@OPiXa v
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(entity, id); k3e?:t 9
} Z&J.8A]L
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publicList findAll(finalClass entity){ E.Arq6
return getHibernateTemplate().find("from gJ5|P
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" + entity.getName()); 0tN/P+!|
} _^] :tL6
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publicList findByNamedQuery(finalString =>)4>WT8A
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namedQuery){ >iWw
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return getHibernateTemplate C;eM:v0A[
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().findByNamedQuery(namedQuery); Q-$EBNz
} uJt*> ;Kp
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publicList findByNamedQuery(finalString query, @ u2P&|:{
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finalObject parameter){ J[4IO
return getHibernateTemplate <a$'tw-8
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().findByNamedQuery(query, parameter); eTY""EWU
} ch:0qgJ
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publicList findByNamedQuery(finalString query, /-&a]PJ
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finalObject[] parameters){ PLDp=T%
return getHibernateTemplate `]l*H3+hg
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().findByNamedQuery(query, parameters); hG%J:}
} jM|-(Es.)
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publicList find(finalString query){ 9..! g:
return getHibernateTemplate().find {qjw
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(query); /?g:`NT
} 9)]asY
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publicList find(finalString query, finalObject K#<cuHGC
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parameter){ O!#bM< *
return getHibernateTemplate().find sT|FgB
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(query, parameter); ;p4|M
} j6{9XIRo_
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public PaginationSupport findPageByCriteria q_|YLs`
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(final DetachedCriteria detachedCriteria){ b )mU9
return findPageByCriteria @z1Yj"^Pm
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); \9GJa"xA`
} 8LM 91
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public PaginationSupport findPageByCriteria y.'5*08S0
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(final DetachedCriteria detachedCriteria, finalint Xitsbf=Gg
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startIndex){ )k}UjU`!
return findPageByCriteria "<y0D!&
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(detachedCriteria, PaginationSupport.PAGESIZE, c8cPGm#i
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startIndex); N4JJA+
} =5jng.
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public PaginationSupport findPageByCriteria ;m[-yqX
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(final DetachedCriteria detachedCriteria, finalint U94Tp A6
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pageSize, t kJw}W1@
finalint startIndex){ 9+o`/lk1
return(PaginationSupport) O4mSr{HCp
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getHibernateTemplate().execute(new HibernateCallback(){ O*8.kqlgt
publicObject doInHibernate S?k G|y
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(Session session)throws HibernateException { I#m0n%-[
Criteria criteria = \q0wY7w
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detachedCriteria.getExecutableCriteria(session); vb$i00?
int totalCount = $Zj3#l:rK
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((Integer) criteria.setProjection(Projections.rowCount OKnpG*)u=g
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()).uniqueResult()).intValue(); =_[Ich,}
criteria.setProjection |9mGX9q
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(null); 7lAn GP.;
List items = *enT2Q
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criteria.setFirstResult(startIndex).setMaxResults Hqb-)8 ~
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(pageSize).list(); rji<g>GQ
PaginationSupport ps = `)M&^Z=D
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new PaginationSupport(items, totalCount, pageSize, T/q*k)IoR
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startIndex); *-@@t+3
return ps; o3.b='HAm
} qR^+K@*|
}, true); Z
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} [L?WM>]%
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public List findAllByCriteria(final `91?^T;\F
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DetachedCriteria detachedCriteria){ MYUL y2)
return(List) getHibernateTemplate z"Wyf6H0T
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().execute(new HibernateCallback(){ nW ]T-!
publicObject doInHibernate G4"[ynlWV
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(Session session)throws HibernateException { MwWN;_#EO)
Criteria criteria = &usum~@
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detachedCriteria.getExecutableCriteria(session); =@.5J'!
return criteria.list(); A~8-{F 31
} 5-"aK~@+
}, true); 0fx.n
} jo"zdb
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public int getCountByCriteria(final ?8$h%Ov-
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DetachedCriteria detachedCriteria){ :BUr8%l
Integer count = (Integer) nb(Od,L
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getHibernateTemplate().execute(new HibernateCallback(){ y{QF#&lW
publicObject doInHibernate ,>3|\4/Q
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(Session session)throws HibernateException { rv%^2h<&
Criteria criteria = {y|j**NZ
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detachedCriteria.getExecutableCriteria(session); <s5s<q2
return Wp//SV
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criteria.setProjection(Projections.rowCount CK1gzIg>
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()).uniqueResult(); Cx
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} EV N:3
}, true); 01o,9_|FL
return count.intValue(); s6_[H
} !{ /AJb
} >~\CiV4^
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用户在web层构造查询条件detachedCriteria,和可选的 B0:/7Ld$Ml
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 [HQ Bx`3TS
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PaginationSupport的实例ps。 9d&}CZr
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ps.getItems()得到已分页好的结果集 ^I6GH?19>e
ps.getIndexes()得到分页索引的数组 3Uni{Z]Q)
ps.getTotalCount()得到总结果数 nWv6I&
ps.getStartIndex()当前分页索引 +AL(K:
ps.getNextIndex()下一页索引 7|q _JdKoU
ps.getPreviousIndex()上一页索引 ah0
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ob"yz }
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 J1{ucFa
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一下代码重构了。 wT-@v,$
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我把原本我的做法也提供出来供大家讨论吧: UJ6zgsD1b?
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首先,为了实现分页查询,我封装了一个Page类: DU1\ K
java代码: ?<-ins
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/*Created on 2005-4-14*/ #~`]eM5`J
package org.flyware.util.page; ,7|Wf
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/** D'3. T{*rH
* @author Joa Bwg\_:vq
* R
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*/ YN 31Lo
publicclass Page { =
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dt|f4XWF
/** imply if the page has previous page */ [*AWCV
privateboolean hasPrePage; !E|k#c9
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/** imply if the page has next page */ <{UjO
privateboolean hasNextPage; zaoC
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/** the number of every page */ 6`l7saHXE
privateint everyPage; lc2RMu
Du."O]syD
/** the total page number */ 8}(ul
privateint totalPage; S|?Ht61k
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/** the number of current page */ [#-!&>
privateint currentPage; v5N2$Sqp*
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/** the begin index of the records by the current xMAb=87_
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query */ 4]/i0\Vbam
privateint beginIndex; Z2x%
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/** The default constructor */ 3 @7<e~f
public Page(){ }475c{
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} 9?_ybO~Oq
bn$}U.m$-
/** construct the page by everyPage ']]&<B}mz
* @param everyPage _noQk3N
* */ 8xEOR!\!`k
public Page(int everyPage){ ^sjL@.'m$N
this.everyPage = everyPage; VF<C#I
} > \KVg(?D
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/** The whole constructor */ ]O;Hlty(g
public Page(boolean hasPrePage, boolean hasNextPage, i!=28|_
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int everyPage, int totalPage, +L$,jZqS
int currentPage, int beginIndex){ l< y9ue=
this.hasPrePage = hasPrePage; d$G<g78D
this.hasNextPage = hasNextPage; _>moza
this.everyPage = everyPage; 426)H_wx
this.totalPage = totalPage; p~sfd
this.currentPage = currentPage; $qx&\@O
this.beginIndex = beginIndex; WSY&\8
} L#`9# Q
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/** 4#qjRmt
* @return P9p{j1*;
* Returns the beginIndex. p]zYj >e
*/ >Ufjmm${
publicint getBeginIndex(){ Qn7l-:`?
return beginIndex; wnE
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} xmDX1sL**
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/** t|X |67W
* @param beginIndex 8dw]i1t<
* The beginIndex to set. 3"gifE
*/ p0.?R
publicvoid setBeginIndex(int beginIndex){ fxDY:l
this.beginIndex = beginIndex; (/_Q
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} @Y>3 -,o,S
vII8>x%*
/** \ooqa<_
* @return H&L=WF+x
* Returns the currentPage. a{h(BI^~
*/ \QUvImT
publicint getCurrentPage(){ &bJ98Nxl
return currentPage; r1FE$R~C=
} Uc0AsUu}?
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/** 9ok|]d P
* @param currentPage &1Fcwj
* The currentPage to set. ^c]Sl
*/ ,l<-*yMD
publicvoid setCurrentPage(int currentPage){ FGx_qBG4|
this.currentPage = currentPage; w c%
} Ut-6!kAm
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/** U30)r+&
* @return Kc udWW]
* Returns the everyPage. RQ,(?I*8\
*/ 1|w,Z+/
publicint getEveryPage(){ /^[)JbgB
return everyPage;
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/
} N0RFPEQ~
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/** ;(0:6P8I
* @param everyPage r-YQsu&
* The everyPage to set. )+t5G>yKK
*/ 5,AQ~_,'\
publicvoid setEveryPage(int everyPage){ p>eD{#2
this.everyPage = everyPage; !CBx$1z
} om_&|9B)
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/** G0s:Dum
* @return Bh' vr3|
* Returns the hasNextPage. jZ
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*/ g[M@
publicboolean getHasNextPage(){ b"FsT
return hasNextPage; <$yer)_J!k
} H9)uni
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/** \(u@F<s-
* @param hasNextPage sp{j!NSL
* The hasNextPage to set. lU$X4JBzS
*/ )%#?3X^sI
publicvoid setHasNextPage(boolean hasNextPage){ _LLshV3
this.hasNextPage = hasNextPage; B9W/bJ6%
} VM;g+RRq
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/** gz\j('~-D
* @return ?*o;o?5s^
* Returns the hasPrePage. MBO,\t.
*/ 1ypjyu
publicboolean getHasPrePage(){ s01$fFJgO
return hasPrePage; 88YC0!Ni
} iiN?\OO^~
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/** sH@ &*
* @param hasPrePage \E&th p
* The hasPrePage to set. l#ygb|=x
*/ Xj;2h{#s
publicvoid setHasPrePage(boolean hasPrePage){ B[7A
this.hasPrePage = hasPrePage; |VYr=hjo
} /J.0s0@
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/** QRiF!D)Nk
* @return Returns the totalPage. 8E-Ip>{>
* d3(+ztmG!
*/ 2D_6
publicint getTotalPage(){ `W="g6(
return totalPage; 7_7xL(F/
} 'Ye]eL,I\
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/** s)Gb!-``
* @param totalPage rNxG0^k(
* The totalPage to set. *.,8,e8Vq
*/ P 4H*jy@?
publicvoid setTotalPage(int totalPage){ Iw*C*%}[Z
this.totalPage = totalPage; k|fh\F+$
} wNbTM.@
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} '%:5axg?]
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. ^BWR
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 VBhE{4J
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个PageUtil,负责对Page对象进行构造: <kROH0+
java代码: ]y$)%J^T
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/*Created on 2005-4-14*/ Q-:Ah:/
package org.flyware.util.page; RLv&,$$0
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import org.apache.commons.logging.Log; rffVfw
import org.apache.commons.logging.LogFactory; Lax9
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/** Ni&,g
* @author Joa pn+D@x#IA
* HE9.
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*/ u|(aS^H=q
publicclass PageUtil { X5|?/aR}
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privatestaticfinal Log logger = LogFactory.getLog N45s'rF
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(PageUtil.class); <?{ SU
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/** Q,ZkeWQ7%
* Use the origin page to create a new page g]:..W7
* @param page goG]WGVr
* @param totalRecords .n?5}s+q
* @return ^w.k^U=B
*/ FI80vV7
publicstatic Page createPage(Page page, int pIk4V/fy
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totalRecords){ IO?~b X P
return createPage(page.getEveryPage(), %w;1*~bH
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page.getCurrentPage(), totalRecords); C6Um6X9/i
} !.x=r
**"zDY*?W
/** #MmmwPB_
* the basic page utils not including exception \Qe'?LRu{
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handler r>n8`W
* @param everyPage EfMG(oI
* @param currentPage _p3WE9T
* @param totalRecords mE)x7
* @return page c~Q`{2%+
*/ sIP6GWK$
publicstatic Page createPage(int everyPage, int )AZ`R8-A
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currentPage, int totalRecords){ bYRQI=gW':
everyPage = getEveryPage(everyPage); L>|A6S#y8/
currentPage = getCurrentPage(currentPage); ~cWLu5
int beginIndex = getBeginIndex(everyPage, nJnO/~|
= m!!
currentPage); dW] Ej"W
int totalPage = getTotalPage(everyPage, M$E8:
<ZN)
/,4PS
totalRecords); (]GY.(F{
boolean hasNextPage = hasNextPage(currentPage, @)FXG~C*
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totalPage); .-gm"lB
boolean hasPrePage = hasPrePage(currentPage); J[Y lo&w3
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returnnew Page(hasPrePage, hasNextPage, 60SenHKles
everyPage, totalPage, B@:XC&R^
currentPage, FZLzu
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beginIndex); `^@g2c+d
} dh7)N}2
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privatestaticint getEveryPage(int everyPage){ ~S~x@&yR
return everyPage == 0 ? 10 : everyPage; TbSt{TX
} S
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privatestaticint getCurrentPage(int currentPage){ Yqj.z| }Nb
return currentPage == 0 ? 1 : currentPage; &