Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 % BKTN@;7
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 *
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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 ppjrm
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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 [bXZPIz;j
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分页支持类: sx\7Z#|
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java代码: tEj5WEnNE8
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package com.javaeye.common.util; =@>&kU%$&
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import java.util.List; PYe>`X?
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publicclass PaginationSupport { #Uu"olX7
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publicfinalstaticint PAGESIZE = 30; ~-/AKaK}
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privateint pageSize = PAGESIZE; Wwz{98,K
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privateList items; =[&Jxy>Y
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privateint totalCount; .9ne'Ta
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privateint[] indexes = newint[0]; S0 `*
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privateint startIndex = 0; ",m5}mk:4
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public PaginationSupport(List items, int r[~$
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totalCount){ zl5S)/A
setPageSize(PAGESIZE); 3^Y-P8.zdB
setTotalCount(totalCount); AXCJFqk;
setItems(items); gNeCnf#Xa
setStartIndex(0); :?J$ +bm}
} 'e@}N)IX
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public PaginationSupport(List items, int ?)&TewP
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totalCount, int startIndex){ 7^F?key?
setPageSize(PAGESIZE); /<@tbZJ*8
setTotalCount(totalCount); !IS,[
setItems(items); c
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setStartIndex(startIndex); 'zaB5d~l
} ;b^@o,=
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public PaginationSupport(List items, int e(^O8
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totalCount, int pageSize, int startIndex){ -_3.]o/J
setPageSize(pageSize); b%BwGS(z
setTotalCount(totalCount); :vj buqN]
setItems(items); {~SR>I3sv
setStartIndex(startIndex); y[cAU:P?
} ~EBZlTN
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publicList getItems(){ 2+.m44>Ti
return items; z!%}0
} e#wn;wo?
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publicvoid setItems(List items){ 19S,>
this.items = items; x^"OH
} @;0Ep0[
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publicint getPageSize(){ = 4If7
return pageSize; [ ,dsVd
} Dz?F,g_
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publicvoid setPageSize(int pageSize){ Z+?j8(:n
this.pageSize = pageSize; G4i&:0
} 4{Iz\:G:{/
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publicint getTotalCount(){
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return totalCount; K"#}R<k8:A
} zri <'W
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publicvoid setTotalCount(int totalCount){ 8P .! q
if(totalCount > 0){ U;(&!Ei
this.totalCount = totalCount; ^%L$$V
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int count = totalCount / 3eB2=_V`
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pageSize; <1y%ch;
if(totalCount % pageSize > 0) UX?_IgJh<"
count++; 0V^?~ex
indexes = newint[count]; #E#70vWp\O
for(int i = 0; i < count; i++){ -+L1Hid.7
indexes = pageSize * <AVpFy
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} Q~9:}_@
}else{ v1}
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this.totalCount = 0; _]\mh,}
} ,=mn*
} 43eGfp'
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publicint[] getIndexes(){ [L 8gG.wy
return indexes; 3laSPih[.
} PtHT>
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publicvoid setIndexes(int[] indexes){ 8S0)_L#S
this.indexes = indexes; w4OVfTlN
} K46\Rm_:B;
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publicint getStartIndex(){ R}0cO^V
return startIndex; {f!m m3'2v
} =q._Qsj?fu
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publicvoid setStartIndex(int startIndex){ A`@we
if(totalCount <= 0) f.,-KIiF
this.startIndex = 0; 4U((dx*m
elseif(startIndex >= totalCount) ?.T=(-
this.startIndex = indexes ?D.]c;PR
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[indexes.length - 1]; (Yx rZ_F'b
elseif(startIndex < 0) xTe?*
this.startIndex = 0; p~r +2(J
else{ pd|c7D!6U,
this.startIndex = indexes 4[6A~iC_
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[startIndex / pageSize]; #i~.wQ$1
} )wKuumet
} Tkd4nRo~
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publicint getNextIndex(){ xQN](OKG
int nextIndex = getStartIndex() + |h.he_B+7
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pageSize; Abj`0\
if(nextIndex >= totalCount) Bdq/Ohw|!
return getStartIndex(); q*
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else W2n%D& PE
return nextIndex; %
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} ~<|xS
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publicint getPreviousIndex(){ ~oOOCB
int previousIndex = getStartIndex() - yXDf;`J
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pageSize; E;h#3
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if(previousIndex < 0) s |qB;
return0; N &=,)d~M
else 1{DHlyA6g
return previousIndex; ^7(zoUn:
} aeSXHd?+(
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} Nf3L
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抽象业务类 JL]6o8x
java代码: ecr pv+
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/** W$,c]/u|
* Created on 2005-7-12 ')go/y`YK
*/ )(,+o
package com.javaeye.common.business; KSLyU1W
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import java.io.Serializable; 65MR(+3
import java.util.List; {+Eq{8m`
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import org.hibernate.Criteria; Xmtq~}K>
import org.hibernate.HibernateException; 7XdLZ4ub
import org.hibernate.Session; @ij}|k%*
import org.hibernate.criterion.DetachedCriteria; &C?]n.A
import org.hibernate.criterion.Projections; 5?QR
import @
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org.springframework.orm.hibernate3.HibernateCallback; n-p|7N
import Cgt{5
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org.springframework.orm.hibernate3.support.HibernateDaoS Nk]r2^.z[
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upport; l^fz
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import com.javaeye.common.util.PaginationSupport; 2c}>}A 4
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public abstract class AbstractManager extends _t3n<
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HibernateDaoSupport { w${=]h*2
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privateboolean cacheQueries = false; 5y@JMQSO
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privateString queryCacheRegion; aA=qel
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publicvoid setCacheQueries(boolean <1V!-D4xu
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cacheQueries){ i9W@$I,f
this.cacheQueries = cacheQueries; a&|aK+^8;
} 6EJ,czt(
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publicvoid setQueryCacheRegion(String HJM- ;C](
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queryCacheRegion){ |UE&M3S
this.queryCacheRegion = ,D>$N3;
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queryCacheRegion; 9V("K
} ]0g<][m
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publicvoid save(finalObject entity){ P)ZGNtO9fG
getHibernateTemplate().save(entity); K5'@$Km
} W~FcU+a
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publicvoid persist(finalObject entity){ <[kdF")
getHibernateTemplate().save(entity); rs'~' Y
} ABB4(_3E
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publicvoid update(finalObject entity){ ,H\EPmNHK
getHibernateTemplate().update(entity); We_/:=
} |h@'~c
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publicvoid delete(finalObject entity){ o|(-0mWBQA
getHibernateTemplate().delete(entity); C%0 |o/Wi
} <e)3 j6F!
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publicObject load(finalClass entity, 5
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finalSerializable id){ QVm3(;&'
return getHibernateTemplate().load {088j?[hzk
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(entity, id); :J5xO%WA(
} P$4G2>D8dg
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publicObject get(finalClass entity, v|"Nx42
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finalSerializable id){ Mq8jPjL
return getHibernateTemplate().get NAlYfbp
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(entity, id); a3sXl+$D@
} D*I%=);B_
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publicList findAll(finalClass entity){ Ft#d&
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return getHibernateTemplate().find("from <9B\('
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" + entity.getName()); u+~Ta
} p{[Ol
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publicList findByNamedQuery(finalString -P^ 6b(
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namedQuery){ inBBU[Sl
return getHibernateTemplate D}r,t_]Eb
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().findByNamedQuery(namedQuery); 2r^|
} hqmKUlo
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publicList findByNamedQuery(finalString query, U5[xW
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finalObject parameter){ TG~:Cmc
return getHibernateTemplate d:|X|0#\uH
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().findByNamedQuery(query, parameter); |x3.r t
} Gcna:w>6d
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publicList findByNamedQuery(finalString query, OEnJ".&V
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finalObject[] parameters){ M1^,g~e
return getHibernateTemplate )4vZIU#
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().findByNamedQuery(query, parameters); pdX%TrM+[:
} Pq ZMuUd
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publicList find(finalString query){ DJ2EV^D+P
return getHibernateTemplate().find iP6$;Y{ZA
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(query); u_[s+J/
} {L$ ]NQdz
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publicList find(finalString query, finalObject 5zWxI]4d\
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parameter){ VImcW;Xa
return getHibernateTemplate().find X>(?
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(query, parameter); @kw#\%Uz
} %6}S1fuA
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public PaginationSupport findPageByCriteria '8R5?9"
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(final DetachedCriteria detachedCriteria){ AL74q[>
return findPageByCriteria .H
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); s-!Bpr16o0
} gJ6C&8tl
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public PaginationSupport findPageByCriteria %]S~PKx
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(final DetachedCriteria detachedCriteria, finalint _h",,"p#o
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startIndex){ sDL@e33Yb
return findPageByCriteria xL,Lb}){%
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(detachedCriteria, PaginationSupport.PAGESIZE, :_E
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startIndex); mojD
} >DeG//rv
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public PaginationSupport findPageByCriteria @AYO )Y8
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(final DetachedCriteria detachedCriteria, finalint FTZ][
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pageSize, }YH@T]O}
finalint startIndex){ !$P+hX`
return(PaginationSupport) !_P;4E
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getHibernateTemplate().execute(new HibernateCallback(){ q] eSDRW
publicObject doInHibernate /R7qR#
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(Session session)throws HibernateException { }JyWy_Y
Criteria criteria = m&(yx|a4+
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detachedCriteria.getExecutableCriteria(session); l ps
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int totalCount = {Hxvt~P
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((Integer) criteria.setProjection(Projections.rowCount H. U wM
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()).uniqueResult()).intValue(); *NzHY;e
criteria.setProjection Z".mEF-b
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(null); o7Ms]AblT
List items = V~ph1Boz2
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criteria.setFirstResult(startIndex).setMaxResults 22lC^)`TE
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(pageSize).list(); lIPy)25~
PaginationSupport ps = D.elE:
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new PaginationSupport(items, totalCount, pageSize, iy_'D
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startIndex); |d}f\a`
return ps; NfqJ>[}I+
} GjlA\R^e
}, true); P[{qp8(g
} }? j>V
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public List findAllByCriteria(final )f(.{M
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DetachedCriteria detachedCriteria){ ?0k(wiF
return(List) getHibernateTemplate DrE
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().execute(new HibernateCallback(){ m:|jv|f
publicObject doInHibernate ue8C pn^M
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(Session session)throws HibernateException { z<2!|
Criteria criteria = t}r`~AEa!
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detachedCriteria.getExecutableCriteria(session); d3Dw[4
return criteria.list(); gx+bKGB`
} M =Pn8<h~
}, true); \z"0lAv"
} $U=E7JO
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public int getCountByCriteria(final v"'Co6fw
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DetachedCriteria detachedCriteria){ t<S]YA~N'
Integer count = (Integer) e45gjjts
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getHibernateTemplate().execute(new HibernateCallback(){ py#`
publicObject doInHibernate jM`)Nd
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(Session session)throws HibernateException { {;.q?mj
Criteria criteria = ).aQ}Gwx^
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detachedCriteria.getExecutableCriteria(session); 90JD`Nz
return l!VPk"s
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criteria.setProjection(Projections.rowCount v^;-w~?3
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()).uniqueResult(); [KrWL;[1<
} hT :+x3
}, true); o!.\+[
return count.intValue(); Wr3j8"f/
} fBCW/<Z
} E({+2}=1
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用户在web层构造查询条件detachedCriteria,和可选的 c)H(w
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 q-c9YOz_
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PaginationSupport的实例ps。 [e1kfw
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ps.getItems()得到已分页好的结果集 l#7].-/
ps.getIndexes()得到分页索引的数组 GdZ_
ps.getTotalCount()得到总结果数 X r7pFw
ps.getStartIndex()当前分页索引 '[u=q
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ps.getNextIndex()下一页索引 VayU
ps.getPreviousIndex()上一页索引 \QF\Bh
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 z;Pr] *F
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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 nya-Io.
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一下代码重构了。 U?/UW;k[
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我把原本我的做法也提供出来供大家讨论吧: -[-LR }u
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首先,为了实现分页查询,我封装了一个Page类: Jvi"K
java代码: c&zZsJ"~
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/*Created on 2005-4-14*/ Fy4jujP<
package org.flyware.util.page; -fF1vJ7L
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/** |||uTfrJ
* @author Joa xEK+NKTeV
*
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*/ /<Nb/#8
publicclass Page { m5KB #\
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/** imply if the page has previous page */ V>#iR>w_4,
privateboolean hasPrePage; oZvQ/|:p!
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/** imply if the page has next page */ 1_JxDT,=>
privateboolean hasNextPage; wg6![Uh
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/** the number of every page */ urGk_.f
privateint everyPage; wk {9
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/** the total page number */ ]:* 8
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privateint totalPage; StUiL>9T#
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/** the number of current page */ @\gTi;u/x
privateint currentPage; /EY^u i
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/** the begin index of the records by the current ; n2|pC^
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query */ Mwdh]I,#
privateint beginIndex; .K![<eZ
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/** The default constructor */ A`4Di8'Me
public Page(){ Q(lj&!?1k
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} >V~q`htth
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/** construct the page by everyPage @_0g "Ul
* @param everyPage lD09(|`
* */ D
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public Page(int everyPage){ C]aa^_Ldd-
this.everyPage = everyPage; gi`K^L=C
} 4XL*e+UfJ
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/** The whole constructor */ t+0&B"
public Page(boolean hasPrePage, boolean hasNextPage, f~Dl;f~H_;
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int everyPage, int totalPage, b6D}GuW
int currentPage, int beginIndex){ K?')#%Z/{#
this.hasPrePage = hasPrePage; RL>Nl ow
this.hasNextPage = hasNextPage; 5GK=R aV
this.everyPage = everyPage; }Gpw2
this.totalPage = totalPage; ,x5`5mT3
this.currentPage = currentPage;
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this.beginIndex = beginIndex; 4QWDuLu
} 9GS<d.#Nvc
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/** W38My j!
* @return Auhw(b>}TW
* Returns the beginIndex. w<_.T#
*/ fys@%PZq
publicint getBeginIndex(){ qs6yEuh#
return beginIndex; <!:,(V>F(C
} 8k'UEf`'(
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/** <[xxCW(2
* @param beginIndex GY4:9Lub7
* The beginIndex to set. p7(xk6W
*/ Ty%4#9``0
publicvoid setBeginIndex(int beginIndex){ (]0$^!YK
this.beginIndex = beginIndex; ToJV.AdfT
} ]?,47,[<
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/** HZ=Dd4!
* @return 8?W!U*0aS
* Returns the currentPage. ]}9cOb%I
*/ YZ\$b=-
publicint getCurrentPage(){ =mCUuY#
return currentPage; j' -akXo<
} JnCY O^Qj
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/** tklU
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* @param currentPage JGZ,5RTq4-
* The currentPage to set. _,b%t1v
*/ 7dX1.}M<(
publicvoid setCurrentPage(int currentPage){ ro37H2^Ty
this.currentPage = currentPage; xkl'Y *
} \Ja%u"DA
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/** ld94ek
* @return 7"=
* Returns the everyPage. ,oDZ:";
*/ g'Ft5fQ"o/
publicint getEveryPage(){ j._9;HifZ
return everyPage; ltt%X].[
} V~5vVY_HG&
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/** %Ua*}C
* @param everyPage D`e!CprF
* The everyPage to set. >8SX ,
*/ N##T1 Qm)
publicvoid setEveryPage(int everyPage){ }"fP,:n"KN
this.everyPage = everyPage;
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} HhNH"b&