Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 R2{X? 2|$
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 23m+"4t
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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 :>u{BG;=79
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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 0Oq1ay^
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分页支持类: ^ +G> N
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java代码: ?6gI8K6X
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package com.javaeye.common.util; 5,3h'\ "!
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import java.util.List; N~_gT
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publicclass PaginationSupport { 4i \n1RW
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publicfinalstaticint PAGESIZE = 30; v}U;@3W8U
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privateint pageSize = PAGESIZE; _;9)^})$
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privateList items; 5Dd;?T>
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privateint totalCount; %$U+?lk}
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privateint[] indexes = newint[0]; }0o0 "J-$
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privateint startIndex = 0; lH8?IkK,g
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public PaginationSupport(List items, int *^]ba>
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totalCount){ 78kk"9h'
setPageSize(PAGESIZE); X|:O`b$G
setTotalCount(totalCount); C.|MA(7
setItems(items); L!5HE])<)
setStartIndex(0); x1Uj4*Au
} YR>x h2< 9
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public PaginationSupport(List items, int o5d)v)Rx=
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totalCount, int startIndex){ & |r)pl0$
setPageSize(PAGESIZE); ;NEHbLH#F
setTotalCount(totalCount); <_}u5E)7(
setItems(items); l?d*g&
setStartIndex(startIndex); xK f+.6 wz
} ;C3](
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public PaginationSupport(List items, int sSxra!tv4
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totalCount, int pageSize, int startIndex){ wcO_;1_
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setPageSize(pageSize); 6N^FJCs
setTotalCount(totalCount); &e{&<ZVR
setItems(items); {|50&]m
setStartIndex(startIndex); FD8Hx\oF
} qQQ~[JL
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publicList getItems(){ k&*=:y}
return items; 0<!BzG
} fa)G$Q
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publicvoid setItems(List items){ Gh.02
this.items = items; LY7'wONx
} (_D#gr{S=
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publicint getPageSize(){ 4r %NtXAa
return pageSize; <D?`*#K
} uKplPze?
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publicvoid setPageSize(int pageSize){ '<O&
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this.pageSize = pageSize; -7u4f y{T
} -Rmz`yOq}
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publicint getTotalCount(){ 3>Yec6Hs
return totalCount; !,]_tw>R
} |&7l*j(\
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publicvoid setTotalCount(int totalCount){ AO/R2a(:
if(totalCount > 0){ +%0+
this.totalCount = totalCount; 8ARpjYZP
int count = totalCount / Q~`n%uYg\{
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pageSize; Pp?J5HW
if(totalCount % pageSize > 0) ,JR7N_"I
count++; B<W{kEY
indexes = newint[count]; 2`x[y?Tn
for(int i = 0; i < count; i++){ 3a =KgOvp
indexes = pageSize * ^z_~e@U
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} 9G&l{7 =
}else{ <)&;9C
this.totalCount = 0; 3K{'~?mM
} 3]T2Zp&;
} SOd(& >
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publicint[] getIndexes(){ 1 #_R`(C{
return indexes; /.vB /{2
} N[Fz6,ZG _
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publicvoid setIndexes(int[] indexes){ ZT!DTb
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this.indexes = indexes; l =#uy
} A@GyKx%x$
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publicint getStartIndex(){ ~"8b\oLW
return startIndex; i-$]Tg
} m)&2zV/Q
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publicvoid setStartIndex(int startIndex){ i0hF9M
if(totalCount <= 0) .(D-vkz'
this.startIndex = 0; =MA$xz3
elseif(startIndex >= totalCount) x5s Yo\
this.startIndex = indexes P)4SrqW_
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[indexes.length - 1]; gWRSS=8%
elseif(startIndex < 0) >Qr(#Bt)
this.startIndex = 0; (Zp'|hx8o
else{ Fq:BRgCE
this.startIndex = indexes S'q (Qo
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[startIndex / pageSize]; E`$d!7O
} =98@MX%P
} [+UF]m%W
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publicint getNextIndex(){ <a; <|Fm.
int nextIndex = getStartIndex() + h",kA(+P
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pageSize; S U04q+
if(nextIndex >= totalCount) n1X 7T0'
return getStartIndex(); 2+50ezsId
else !A qSG-
return nextIndex; R]H/Jv\'
} }9=VhC%J
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publicint getPreviousIndex(){ -Z9e}$q$,
int previousIndex = getStartIndex() - JHBX'1GQa
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pageSize; 26?yEd6^Z
if(previousIndex < 0) pkQEry&Z
return0; n'>`2 s
else #fd;]
return previousIndex; bejvw?)S.
} _46
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抽象业务类 f5'Cq)Vw_
java代码: < j^8L^
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/** 7S|nn|\Kp
* Created on 2005-7-12 j&~`H:=E
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package com.javaeye.common.business; [,JUC<
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import java.io.Serializable; DvhJkdLB>
import java.util.List; }f45>@uMW
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import org.hibernate.Criteria; jOV,q%)^,:
import org.hibernate.HibernateException; EdR1W~JZ
import org.hibernate.Session; KPTp91
import org.hibernate.criterion.DetachedCriteria; ,NB?_\$c
import org.hibernate.criterion.Projections; [M?'Nw/[S
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org.springframework.orm.hibernate3.HibernateCallback; O7vJ`K(!
import h'%iY6!fA
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org.springframework.orm.hibernate3.support.HibernateDaoS Qu]F<H*Y|
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upport; vuN!7*d+
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import com.javaeye.common.util.PaginationSupport; 4E:kDl* @
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public abstract class AbstractManager extends hUR>NUK@8
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HibernateDaoSupport { FK
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privateboolean cacheQueries = false; d^pzMaCI
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privateString queryCacheRegion; !'#Y-"=ypk
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publicvoid setCacheQueries(boolean `?P)RS30
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cacheQueries){ n;QMiz:yY
this.cacheQueries = cacheQueries; S3fyt]pp
} O S?S$y
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publicvoid setQueryCacheRegion(String AXN%b2
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queryCacheRegion){ B\*"rSP\
this.queryCacheRegion = ebv"`0K$
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queryCacheRegion; A*b>@>2
} T*pcS'?'
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publicvoid save(finalObject entity){ u?xXZ]_u-
getHibernateTemplate().save(entity); 85gdmla@9
} ';,Rq9-'
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publicvoid persist(finalObject entity){ uz
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getHibernateTemplate().save(entity); jc0Trs{Jf
} cI#! Y
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publicvoid update(finalObject entity){ u/6b.hDO
getHibernateTemplate().update(entity); ^VL",Nt
} ?xX9o
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publicvoid delete(finalObject entity){ *gGL5<%T:
getHibernateTemplate().delete(entity); VelR8tjP
} ais@|s;
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publicObject load(finalClass entity, <?h,;]U
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finalSerializable id){ $- 4 Zi
return getHibernateTemplate().load A*x3O%zH
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(entity, id); 25R6>CXsi
} %Bxp
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publicObject get(finalClass entity, 'cgB$:T}.,
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finalSerializable id){ 4;;K1< 1
return getHibernateTemplate().get P[q 'Y^\
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(entity, id); =hAH6C
} fY|P+{BO2
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publicList findAll(finalClass entity){ vr2cDk{
return getHibernateTemplate().find("from mu$0x)
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" + entity.getName()); 1^v?Ly8
} <<vT"2Q]
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publicList findByNamedQuery(finalString Yt3+o<
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namedQuery){ f5tkv<) %
return getHibernateTemplate F4X0DRC,G
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().findByNamedQuery(namedQuery); G?$0OU
} p 3`odmbN
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publicList findByNamedQuery(finalString query, q{RH/. l
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finalObject parameter){ xtq='s8e
return getHibernateTemplate t^')ST
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().findByNamedQuery(query, parameter); Z]^Ooy[pb
} <$+Cd=71\
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publicList findByNamedQuery(finalString query, ZvVrbj&
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finalObject[] parameters){ -F338J+J24
return getHibernateTemplate 5J vrQGvL
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().findByNamedQuery(query, parameters); @gM>Lxj
} S`t@L}
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publicList find(finalString query){ /9wmc2
return getHibernateTemplate().find 0Z,a3)jcc
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(query); o?]N2e&(
} wR@"]WkR=
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publicList find(finalString query, finalObject %HWebZ-yY
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parameter){ drkY~!a
return getHibernateTemplate().find bw[s<z|LKA
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(query, parameter); sgxD5xj}4
} zQ>|`0&8
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public PaginationSupport findPageByCriteria *wu:fb2[(
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(final DetachedCriteria detachedCriteria){ xp68-&
return findPageByCriteria *;u'W|"/~
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); G\4*6iw:
} GB&^<@
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public PaginationSupport findPageByCriteria sngM4ikhs
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(final DetachedCriteria detachedCriteria, finalint ]8~{C>ch$
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startIndex){ \.l8]LH
return findPageByCriteria zMI_8lNz
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(detachedCriteria, PaginationSupport.PAGESIZE, duT'$}2@>
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startIndex); yZc_PC`
} [!'fE#"a
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public PaginationSupport findPageByCriteria Wm#F~<$
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(final DetachedCriteria detachedCriteria, finalint <>?7veN92
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pageSize, Z^_-LX:%
finalint startIndex){ *74VrAo
return(PaginationSupport) _7=LSf,9
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getHibernateTemplate().execute(new HibernateCallback(){ [PP&}.k4"
publicObject doInHibernate vOV$H le
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(Session session)throws HibernateException { *MD\YFXR
Criteria criteria = M9ACaf@
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detachedCriteria.getExecutableCriteria(session); JC#M,j2
int totalCount = 1/J3 9Y~+
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((Integer) criteria.setProjection(Projections.rowCount sO$X5S C9
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()).uniqueResult()).intValue(); E9 6`
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criteria.setProjection `SM37({c
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(null); lFT`
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List items = `~;`q
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criteria.setFirstResult(startIndex).setMaxResults {1Hs5bg@
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(pageSize).list(); C(!A% >
PaginationSupport ps = eJ3;Sd''
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new PaginationSupport(items, totalCount, pageSize, a]4h5kJ';
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startIndex); i8Xz'Sw07
return ps; FhJtiw@
} 0T7c =5z4W
}, true); -)E
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} <!G%P4)
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public List findAllByCriteria(final ic=tVs
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DetachedCriteria detachedCriteria){ +JlPQ~5
return(List) getHibernateTemplate rZ:-%#Q4
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().execute(new HibernateCallback(){ u [Dz~
publicObject doInHibernate >HL$=J_K?
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(Session session)throws HibernateException { 8m"(T-wb6{
Criteria criteria = 1a@b-V2
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detachedCriteria.getExecutableCriteria(session); R^k)^!/$f
return criteria.list(); P,W(9&KM
} YQN@;
}, true); )Rc
} ~pWV[oUD
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public int getCountByCriteria(final &OXm^f)K
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DetachedCriteria detachedCriteria){ +rWcfXOHM
Integer count = (Integer) OYLg-S
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getHibernateTemplate().execute(new HibernateCallback(){ t`Lh(`
publicObject doInHibernate 7N4)T'B
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(Session session)throws HibernateException { \ Dccf_(Pb
Criteria criteria = \m%Z;xKG
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detachedCriteria.getExecutableCriteria(session); r(OH
return tYUg%2G
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criteria.setProjection(Projections.rowCount K*9~g('
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()).uniqueResult(); Nf!WqD* je
} VxW>XxG0
}, true); 8{DW$ZtR
return count.intValue(); _X)`S"EsJ
} ^`+Kjhht
} ?X^.2+]*&
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用户在web层构造查询条件detachedCriteria,和可选的 /C6$B)w_*{
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 !t!'
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PaginationSupport的实例ps。 ',m!L@7M5
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ps.getItems()得到已分页好的结果集 RXw }Tb/D8
ps.getIndexes()得到分页索引的数组 &|I{ju_
ps.getTotalCount()得到总结果数 fM!@cph(8
ps.getStartIndex()当前分页索引 7Sl"q=>
ps.getNextIndex()下一页索引 K_GqM9
ps.getPreviousIndex()上一页索引 FM,o&0HSd
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 avy@)iO7
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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 @S)p{T5G
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一下代码重构了。 8SOfX^;o
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我把原本我的做法也提供出来供大家讨论吧: Q5 =
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首先,为了实现分页查询,我封装了一个Page类: `N;O6
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java代码: CF]#0*MI
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/*Created on 2005-4-14*/ DbrK,'b%
package org.flyware.util.page; I/_,24[
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/**
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* @author Joa @r]1;KG
* 1xj w=
*/ nJR(lXWO
publicclass Page { KvmXRf*z
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/** imply if the page has previous page */ U"OA m}
privateboolean hasPrePage; i?n#ge
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/** imply if the page has next page */ :wz]d ~)
privateboolean hasNextPage; I<!,_$:
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/** the number of every page */ Lm7fz9F%
privateint everyPage; pGP$2
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