Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ]ZV.@%+
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ]ow$VF{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 VRuY8<E
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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 /NFk@8<?
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分页支持类: =:)p\{B
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java代码: ,8~qnLy9
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package com.javaeye.common.util; Gjhpi5?%8
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import java.util.List; Yp*Dd}n`
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publicclass PaginationSupport { }BTK+Tk8
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publicfinalstaticint PAGESIZE = 30; ,8=`Y9#
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privateint pageSize = PAGESIZE; m=g\@&N
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privateList items; N4]Sp v
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privateint totalCount; <c`+ fPW
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privateint[] indexes = newint[0]; DdUT"%
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privateint startIndex = 0; MK"p~b0->
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public PaginationSupport(List items, int qDG{hvl[1r
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totalCount){ bl8zcpdL
setPageSize(PAGESIZE); z|KQiLza
setTotalCount(totalCount); T\ixS-%^
setItems(items); C)x>/Qr ~
setStartIndex(0); 47S1mxur
} EC`!&Yp+
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public PaginationSupport(List items, int gu~JB
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totalCount, int startIndex){ v'0WE
setPageSize(PAGESIZE); $N
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setTotalCount(totalCount); @u@N&{b5"
setItems(items); T^z
setStartIndex(startIndex); N>zpxU {
} 35q4](o9"
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public PaginationSupport(List items, int 9i6z p'
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totalCount, int pageSize, int startIndex){ bcM65pt_C
setPageSize(pageSize); ,.<[iHC}9
setTotalCount(totalCount); B=?m_4\$m
setItems(items); =nVEdRU
setStartIndex(startIndex); o\TXWqt
} /$EX-!ie
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publicList getItems(){ -0I]Sm;$
return items;
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} g6 AEMer
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publicvoid setItems(List items){ 3]46qk'
this.items = items; Z=[qaJ{]
} r$8(Q'
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publicint getPageSize(){ QPD[uJ(I
return pageSize; `6No6.\J
} 8QJ^@|7
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publicvoid setPageSize(int pageSize){ =c-Y >
this.pageSize = pageSize; /v <FH}
} i?HN
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publicint getTotalCount(){ z9}WP$W
return totalCount; %@,%A_So k
} U%:K11Kr
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publicvoid setTotalCount(int totalCount){ [=EmDP:@
if(totalCount > 0){ /h]#}y j
this.totalCount = totalCount; qS9z0HLE
int count = totalCount / (93$ L zZ
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pageSize; &.v|yG]&
if(totalCount % pageSize > 0) F
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count++; oCxh[U@*D
indexes = newint[count]; .!`y(N0hc
for(int i = 0; i < count; i++){ p2=+cS"HC
indexes = pageSize * kd=|Iip;(
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} za,JCI
}else{ -:V0pb
this.totalCount = 0; hifC.guK
} E"'4=_
} r|ID]}w
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publicint[] getIndexes(){ ZRy'lW
return indexes; >)j`Q1Qc\
} rOo|.4w
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publicvoid setIndexes(int[] indexes){ _{C
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this.indexes = indexes; n40&4n
} WSsX*L
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publicint getStartIndex(){ W2w A66MB
return startIndex; IaHu$` v
} NMvNw?]
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publicvoid setStartIndex(int startIndex){ -V F*h.'
if(totalCount <= 0) W#bOx0
this.startIndex = 0; k .#I ;7
elseif(startIndex >= totalCount) /)J]m
this.startIndex = indexes FoW|BGA~
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[indexes.length - 1]; 2v\<MrL
elseif(startIndex < 0) xt zjFfq
this.startIndex = 0; jU}iQM
else{ L!LhH
this.startIndex = indexes V |hr 9
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[startIndex / pageSize]; eia>Y$
} bjr()NM1
} 4(%LG)a4S
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publicint getNextIndex(){ dr gCr:Gf
int nextIndex = getStartIndex() + x:E:~h[.^
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pageSize; Koi-b
if(nextIndex >= totalCount) 2{9%E6%#
return getStartIndex(); 2]V&]s8Wi=
else DyCnL@
return nextIndex; ?3yrX_Qm{
} vo"?a~kY7
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publicint getPreviousIndex(){ kKs}E| T
int previousIndex = getStartIndex() - c\.7Z=D
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pageSize; jmJeu@(
if(previousIndex < 0) M`49ydh&
return0; *3A)s
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else >|rU*+I`
return previousIndex; V'8Rz#Gc5
} }G ^nK m
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} G0lg5iA<fC
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抽象业务类 aXgngwq
java代码: .YlhK=d4
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/** {:TOm0eK
* Created on 2005-7-12 \qkb8H
*/ 560`R>
package com.javaeye.common.business; #By~gcN
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import java.io.Serializable; D}OhmOu3
import java.util.List; VJSkQ\KD
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import org.hibernate.Criteria; Y<;KKD5P'j
import org.hibernate.HibernateException; K)#6&\0tT
import org.hibernate.Session; %cl{J_}{&
import org.hibernate.criterion.DetachedCriteria; "Ky&x$dje
import org.hibernate.criterion.Projections; hiw>Q7W
import |lMc6C
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org.springframework.orm.hibernate3.HibernateCallback; M-/2{F[
import S#b)RpY
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org.springframework.orm.hibernate3.support.HibernateDaoS XaH;
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upport; YM&i
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import com.javaeye.common.util.PaginationSupport; i}/Het+(
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public abstract class AbstractManager extends C#@-uo2
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HibernateDaoSupport { o]aMhSol
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privateboolean cacheQueries = false; 6T6UIq
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privateString queryCacheRegion; l9naqb:iP
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publicvoid setCacheQueries(boolean 'kHa_
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cacheQueries){ |&_(I
this.cacheQueries = cacheQueries;
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} P-\65]`C
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publicvoid setQueryCacheRegion(String N6BEl55 &
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queryCacheRegion){ ot,=.%O
this.queryCacheRegion = 'DD~xCXE
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queryCacheRegion; 3/Dis)
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} F- {hXM
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publicvoid save(finalObject entity){ vT#m 8Kg
getHibernateTemplate().save(entity); GI%9Tif
} 7X8n|NZRH7
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publicvoid persist(finalObject entity){ J@qwz[d i
getHibernateTemplate().save(entity); _xGC0f (
} +J3Y}A4W3X
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publicvoid update(finalObject entity){ ]\F}-I[
getHibernateTemplate().update(entity); #c(BBTuX
} B:6VD /qC
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publicvoid delete(finalObject entity){ 9P*p{O{_
getHibernateTemplate().delete(entity); cd;~60@K
} $9ys!
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publicObject load(finalClass entity, ,S?M;n?z_
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finalSerializable id){ hR,5U=+M7
return getHibernateTemplate().load A\v]ZN4
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(entity, id); .xe+cK
} %UB+N8x`a
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publicObject get(finalClass entity, Bp/25jy
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finalSerializable id){ (H-kWT
return getHibernateTemplate().get BOme`0A
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(entity, id); Hm]\.ZEy
} *l)}o4-$
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publicList findAll(finalClass entity){ %JuT'7VB
return getHibernateTemplate().find("from W];l[D<S*
Jp(CBCG{F
" + entity.getName()); ^4=%~Yx
} c3J12+~;
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publicList findByNamedQuery(finalString ZL'krV
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namedQuery){ +0M0g_sk
return getHibernateTemplate s,~g| I\
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().findByNamedQuery(namedQuery); Na<);Pg
} Mh=j^ [4Q
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publicList findByNamedQuery(finalString query, R/kF,}^F
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finalObject parameter){ gaR~K
return getHibernateTemplate y)b=7sU
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().findByNamedQuery(query, parameter); z0?IQzR^T
} zE?@_p1gei
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publicList findByNamedQuery(finalString query, ;]_h")4"c
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finalObject[] parameters){ %(>,eee_
return getHibernateTemplate z)%]#QO
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().findByNamedQuery(query, parameters); {GG;/Ns{f-
} ]\*_}
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publicList find(finalString query){ VJgYXPE
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return getHibernateTemplate().find ?D=C8[NEX
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(query); s/Q8(sF5
} U&gI_z[
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publicList find(finalString query, finalObject j5G=ZI86y
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parameter){ KdC'#$
return getHibernateTemplate().find mJ+mTA5bW
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(query, parameter); B[fbP rM
} )^m"fQ+
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public PaginationSupport findPageByCriteria Rl n% Y
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(final DetachedCriteria detachedCriteria){ 0+Q;a
return findPageByCriteria URj2 evYW
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); *@g>~q{`
} ]r>m{"~E
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public PaginationSupport findPageByCriteria Cps'l
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(final DetachedCriteria detachedCriteria, finalint _J>!K'Dz
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startIndex){ a$$aM2.2
return findPageByCriteria Dmr3r[
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(detachedCriteria, PaginationSupport.PAGESIZE, =L*-2cE6#
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startIndex); &+ UnPE(
} C&;m56
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public PaginationSupport findPageByCriteria N[;R8SP
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(final DetachedCriteria detachedCriteria, finalint 6\xfoy|j
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pageSize, ]:~z#k|2@6
finalint startIndex){ drS>~lSxB
return(PaginationSupport) 'k/:3?R
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getHibernateTemplate().execute(new HibernateCallback(){ |J:m{
publicObject doInHibernate r)oR`\7
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(Session session)throws HibernateException { eJE!\ucS2W
Criteria criteria = qEfg-`*M
{}"a_L&[;
detachedCriteria.getExecutableCriteria(session); hQaa"U7[
int totalCount = ow*^z78M{
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((Integer) criteria.setProjection(Projections.rowCount CQH^VTQ
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()).uniqueResult()).intValue(); G' mg-{
criteria.setProjection na_Wp^;
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(null); yv\
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List items = \6;b.&%w2
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criteria.setFirstResult(startIndex).setMaxResults 9
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rs,:pU
(pageSize).list(); >Zh^,T={G
PaginationSupport ps = i&0Zli
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new PaginationSupport(items, totalCount, pageSize, Ted!*HKlB
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startIndex); zA8Tp8(
return ps; {0L)B{|
} N'YQ6U
}, true); `:
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} _C@<*L=Q
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public List findAllByCriteria(final X 1}U
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DetachedCriteria detachedCriteria){ LknV47vd
return(List) getHibernateTemplate eOJ_L]y-
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().execute(new HibernateCallback(){ /@0
publicObject doInHibernate <"nF`'olV
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(Session session)throws HibernateException { %S<))G
Criteria criteria = lhB;jE
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detachedCriteria.getExecutableCriteria(session); 1aoKf F(
return criteria.list(); x/IAc6H~_8
} F **/T
}, true); P7*?E*
} D:PrFa
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public int getCountByCriteria(final )TwA?kj
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DetachedCriteria detachedCriteria){ k]S`A,~
Integer count = (Integer) .5iXOS0
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getHibernateTemplate().execute(new HibernateCallback(){ oWBjPsQ
publicObject doInHibernate 0r]-Ltvl?}
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(Session session)throws HibernateException { na3lbwq
Criteria criteria = Ie4Xk
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detachedCriteria.getExecutableCriteria(session); `2n%Lo?_
return !XO"lS
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criteria.setProjection(Projections.rowCount p?sFX$S
@[~j|YH}
()).uniqueResult(); >[4CQK`U
} a<P?4tbF
}, true); eNr2-R
return count.intValue(); SeBl*V
} dl+:u}9M$
} 6nW]Q^N}
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用户在web层构造查询条件detachedCriteria,和可选的 Os1=V
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Z%QU5.
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PaginationSupport的实例ps。 oFp4*<\
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ps.getItems()得到已分页好的结果集 9HZR%s[J
ps.getIndexes()得到分页索引的数组 dI~{0)s
ps.getTotalCount()得到总结果数 l42tTD8Awz
ps.getStartIndex()当前分页索引 ,b74m
ps.getNextIndex()下一页索引 YeB)]$'?u`
ps.getPreviousIndex()上一页索引 /,JL \b
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 %h&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 q!<n\X3]u
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一下代码重构了。 sH :_sOV*
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我把原本我的做法也提供出来供大家讨论吧: 7a4h7/
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首先,为了实现分页查询,我封装了一个Page类: $8fJ DN
java代码: Vs,
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/*Created on 2005-4-14*/ +}Qq#^:_\
package org.flyware.util.page; .r \g]
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/** FTcXjWBPF9
* @author Joa htOVt\+!34
* a+P^?N
*/ M`,`2I A
publicclass Page { 'h `)6{
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/** imply if the page has previous page */ YeVkX{y
privateboolean hasPrePage; gS.,V!#t
? ;$f"Wl
/** imply if the page has next page */ 73kI%nNB
privateboolean hasNextPage; 5]Y?NN,GR
;
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/** the number of every page */ R|-!5J4h
privateint everyPage; \
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/** the total page number */ @'JA3V}
privateint totalPage; >5j&Q