Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 v[#9+6P=
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 .{ 44a$)
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 3= xhoRX
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 s4 6}s{6
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分页支持类: &C_'p {G
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java代码: ?"zY"*>4
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package com.javaeye.common.util; fQL"O}Z
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import java.util.List; rA2g&
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publicclass PaginationSupport { RY c!~Wh~Y
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publicfinalstaticint PAGESIZE = 30; FL(6?8zK
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privateint pageSize = PAGESIZE; *c%oN
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privateList items; uHAT#\m:
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privateint totalCount; 2>86oP&
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privateint[] indexes = newint[0]; KN7^:cC
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privateint startIndex = 0; )dY=0"4Z
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public PaginationSupport(List items, int 9:`(Q3Ei
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totalCount){ q4}PM[K?=\
setPageSize(PAGESIZE); T :/,2.l
setTotalCount(totalCount); 0A,]$Fzt
setItems(items); ;QW3CEaUq
setStartIndex(0); Nluv/?<
} DyeQJ7p
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public PaginationSupport(List items, int uiJS8(Cb
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totalCount, int startIndex){ (FJ9-K0b{n
setPageSize(PAGESIZE); @+9<O0
setTotalCount(totalCount); ?t+5s]
setItems(items); p/U+0f
setStartIndex(startIndex); vG;zJ#c
} PH>
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public PaginationSupport(List items, int 3GuH857ov
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totalCount, int pageSize, int startIndex){ cs1l~bl
setPageSize(pageSize); br0++}vwL
setTotalCount(totalCount); z]2]XTmWs
setItems(items); %I-+Ead0i
setStartIndex(startIndex); TQ`Rk;0R
} X=Ys<TM,
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publicList getItems(){ H"C[&r
return items;
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} em\ 9'L^
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publicvoid setItems(List items){ `ORECg)
this.items = items; _UT$,0u_i
} y_HN6
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publicint getPageSize(){ m}8[#:
return pageSize; AgRjr"hF*e
} ^)?d6nI
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publicvoid setPageSize(int pageSize){ F:D
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this.pageSize = pageSize; +=]!P#
} +<}0|Xl&
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publicint getTotalCount(){ `E!N9qI?t$
return totalCount; 7C$
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} l#lF
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publicvoid setTotalCount(int totalCount){ (u]N
if(totalCount > 0){ _[Vf547vS
this.totalCount = totalCount; 6m VuyI
int count = totalCount / =7m}yDs6$
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pageSize; 3d-%>?-ee
if(totalCount % pageSize > 0) eL4NB$Fb
count++; 25NTIzI@@
indexes = newint[count]; 70lfb`
for(int i = 0; i < count; i++){ Y!WG)u5
indexes = pageSize * R |f~>JUF
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} }BiiE%a
}else{ <,AS8^$X[
this.totalCount = 0; 4GR!y)
} $''9K
} ,=aJVb=C
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publicint[] getIndexes(){ n39t}`WIl
return indexes; 'kYwz;gp
} G[8in
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publicvoid setIndexes(int[] indexes){ ,+g&o^T
this.indexes = indexes; -!0_:m3
} EwS!]h?
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publicint getStartIndex(){ @Kf_z5tm:
return startIndex; LTJc,3\,
} 8vuCc=
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publicvoid setStartIndex(int startIndex){ BSq)RV/3
if(totalCount <= 0) En&5)c+js4
this.startIndex = 0; g~BoFc.V2~
elseif(startIndex >= totalCount) m%"uPv\
this.startIndex = indexes 0wFH!s/B
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[indexes.length - 1]; P ]i
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elseif(startIndex < 0) QRLJ_W^&u
this.startIndex = 0; m^_6:Q0F!8
else{ ~^^ NHq
this.startIndex = indexes LkLN7|
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[startIndex / pageSize]; .D4bqL
} Z+pom7A"E
} {B*W\[ns
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publicint getNextIndex(){ ]NhS=3*i+
int nextIndex = getStartIndex() + ^). )
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pageSize; pPVRsXy
if(nextIndex >= totalCount) }j1!j&&
return getStartIndex(); ?3Ij*}_O2
else .$",
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return nextIndex; 'SLE;_TD
} 19(Dj&x
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publicint getPreviousIndex(){ h{lDxOH*
int previousIndex = getStartIndex() - "Lh
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pageSize; 2JmZ{
if(previousIndex < 0) w:o-klKXY
return0; Je4Z(kj 0
else Q36)7=at
return previousIndex; f>$h@/-*
} 5)zn :$cz
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} 5/m$)wE
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抽象业务类 &jV_"_3n
java代码: 1xnLB>jP#
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/** |'HLz=5\
* Created on 2005-7-12 q}L+/+b
*/ <
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package com.javaeye.common.business; (L6Cy%KgV
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import java.io.Serializable; =lr) gj
import java.util.List; w#G2-?aj
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import org.hibernate.Criteria; ul5|.C
import org.hibernate.HibernateException; H D/5!d
import org.hibernate.Session; dc 0@Y
import org.hibernate.criterion.DetachedCriteria; =~FG&rk^
import org.hibernate.criterion.Projections; US? Rr
import sLcY,AH
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org.springframework.orm.hibernate3.HibernateCallback; y@vj;3:
import o96:4j4
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org.springframework.orm.hibernate3.support.HibernateDaoS K <`>O,
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upport; "/%89 HMD
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import com.javaeye.common.util.PaginationSupport; -rY 7)=
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public abstract class AbstractManager extends KS>$`ax,
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HibernateDaoSupport { H 30OUrD
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privateboolean cacheQueries = false; )r!e2zc=Q
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privateString queryCacheRegion; Y_H/3?b%
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publicvoid setCacheQueries(boolean E8[XG2ye
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cacheQueries){ D\rmaF+
this.cacheQueries = cacheQueries; VWvoQf^+
} 6$e]i|e
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publicvoid setQueryCacheRegion(String pt!'v$G/*
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queryCacheRegion){
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this.queryCacheRegion = !Cb=B
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queryCacheRegion; };SV!'9s?~
} \|q-+4]@,
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publicvoid save(finalObject entity){ P4%>k6X
getHibernateTemplate().save(entity); vgk9b!Xd
} {%7<"
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publicvoid persist(finalObject entity){ T|+$@o
getHibernateTemplate().save(entity); nLd~2qBuv
} IK?]PmN4}
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publicvoid update(finalObject entity){ 5;
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getHibernateTemplate().update(entity); a|.20w5
} BTs0o&}e
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publicvoid delete(finalObject entity){ }+*w.X}L
getHibernateTemplate().delete(entity); SQKi2\8w
} :a=ro2NH
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publicObject load(finalClass entity, "IOC[ #&G
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finalSerializable id){ sE^ns\&QP=
return getHibernateTemplate().load E1^aAlVSD
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(entity, id); sWp{Y.
} qK{|Q
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publicObject get(finalClass entity, >F,$;y52
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finalSerializable id){ ^xzE^"G6
return getHibernateTemplate().get
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(entity, id); un.G6| S
} (r.$%[,.<
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publicList findAll(finalClass entity){ 9` OG
return getHibernateTemplate().find("from ac2}3$u
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" + entity.getName()); rd|@*^k
} HR/k{"8W4Q
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publicList findByNamedQuery(finalString nL 1IS
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namedQuery){ d)`nxnbMeM
return getHibernateTemplate 9itdRa==
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().findByNamedQuery(namedQuery); dM);LT8@
} .F{}~K]
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publicList findByNamedQuery(finalString query, WyKUvVi
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finalObject parameter){ 31
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return getHibernateTemplate , V0iMq
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().findByNamedQuery(query, parameter); &4ug3
} }w|=c>'_}
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publicList findByNamedQuery(finalString query, {[(W4NAlH
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finalObject[] parameters){ \?5[RR
return getHibernateTemplate ND)M3qp2(
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().findByNamedQuery(query, parameters); UcKWa>:Fi
} !VJT"Ds_
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publicList find(finalString query){ 8yJk81
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return getHibernateTemplate().find YQfZiz}Fv
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(query); ]8q%bsl+
} \k$]GK-
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publicList find(finalString query, finalObject IAt+S-q0
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parameter){ fe]T9EDA
return getHibernateTemplate().find Ni;{\"Gt
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(query, parameter); $F==n4)
} ~m"M#1,ln3
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public PaginationSupport findPageByCriteria R|^t~h-
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(final DetachedCriteria detachedCriteria){ lVKF^-i
return findPageByCriteria /)HEx&SQmZ
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); aG&kl O>m
} "Mu$3w
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public PaginationSupport findPageByCriteria FV<^q|K/(]
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(final DetachedCriteria detachedCriteria, finalint =I*ZOE3n
/:];2P6#X
startIndex){ ` G/QJH{I
return findPageByCriteria ]4pC\0c
jZgnt{
(detachedCriteria, PaginationSupport.PAGESIZE, pl? J<48
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startIndex); N,'qMoNf
} fxCPGj
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public PaginationSupport findPageByCriteria b8xfV{3 L
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(final DetachedCriteria detachedCriteria, finalint bqLYF[#T
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pageSize, Le+8s LE`Y
finalint startIndex){ GAe_Z(T
return(PaginationSupport) 3xR#,22:}
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getHibernateTemplate().execute(new HibernateCallback(){ - cC(d$y
publicObject doInHibernate #hiDZ>nr
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(Session session)throws HibernateException { LGue=Hkp
Criteria criteria = fXR_)d
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detachedCriteria.getExecutableCriteria(session); ~]s"PV:|
int totalCount = g0U\AN
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((Integer) criteria.setProjection(Projections.rowCount c35vjYQx0
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()).uniqueResult()).intValue(); ?DTP-#5Ba
criteria.setProjection 1T^L) %&p_
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(null); U-N/Z\QD
List items = 2n,73$s
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criteria.setFirstResult(startIndex).setMaxResults _A~gqOe
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(pageSize).list(); FK('E3PG
PaginationSupport ps = Qi L
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new PaginationSupport(items, totalCount, pageSize, @_Oe`j^
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startIndex); '.v^seU
return ps; Q";eyYdOL
} M)RQIl5
}, true); Gi2Ey37]O
} f.CI.aozW
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public List findAllByCriteria(final *a.*Ha
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DetachedCriteria detachedCriteria){ Q*(C)/ QW
return(List) getHibernateTemplate HK.J/Zr
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().execute(new HibernateCallback(){ jzw?V9Ijb
publicObject doInHibernate 2geC3v% 0o
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(Session session)throws HibernateException { k,(_R=
Criteria criteria = e@By@r&nql
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detachedCriteria.getExecutableCriteria(session); TD9`SSpP
return criteria.list(); ?^Ux+mVE
} <rF
}, true); &9{BuBO[
} `7ZJB$7D|*
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public int getCountByCriteria(final b>WT-.b0
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DetachedCriteria detachedCriteria){ ARo5 Ss{
Integer count = (Integer) j+/*NM_y3
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getHibernateTemplate().execute(new HibernateCallback(){ E(#2/E6
publicObject doInHibernate uUs>/+
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(Session session)throws HibernateException { 2D"/k'iA
Criteria criteria = i2E7$[
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detachedCriteria.getExecutableCriteria(session); "N_?yA#(j
return f_8~b0`
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criteria.setProjection(Projections.rowCount jK53-tF~I
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()).uniqueResult(); =UY@,*q:c
} }p~%GA.=98
}, true); )3
return count.intValue(); ^da-R;o]
} ";]m]PRAam
} v#xF;@G
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用户在web层构造查询条件detachedCriteria,和可选的 65v'/m!ys
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 $.Ni'U
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PaginationSupport的实例ps。 ;<\*(rUe
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ps.getItems()得到已分页好的结果集 CfU)+20
ps.getIndexes()得到分页索引的数组 e]QkZg2?Yn
ps.getTotalCount()得到总结果数 -84Z8?_
ps.getStartIndex()当前分页索引 uw]Jm"=w
ps.getNextIndex()下一页索引 /Q-!><riD
ps.getPreviousIndex()上一页索引 s6I]H
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 DQSv'!KFO
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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 =GF+hM/~
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一下代码重构了。 <:?&}'aA
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我把原本我的做法也提供出来供大家讨论吧: T*oH tpFj#
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首先,为了实现分页查询,我封装了一个Page类: ]n+:lsiV
java代码: ;(XSw%Y
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/*Created on 2005-4-14*/ &HWH
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package org.flyware.util.page; HV}NT~
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/** e"vEh
* @author Joa ~Sh}\&3p
* DT*/2TH*l
*/ !o`al` q'
publicclass Page { 7l?=$q>k"
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/** imply if the page has previous page */ uuq?0t2Z
privateboolean hasPrePage; bc+'n
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/** imply if the page has next page */ PgVM>_nHk
privateboolean hasNextPage; zIQ\_>
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/** the number of every page */ Y$(G)Fs
privateint everyPage; 7|{QAv
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/** the total page number */ Q[}mH: w
privateint totalPage; o}[wu:>yk
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/** the number of current page */ .9`.\v6R
privateint currentPage; Sna7r~j
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/** the begin index of the records by the current U7{,
*
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query */ wt-)5f'{
privateint beginIndex; `AYHCn
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/** The default constructor */ `>K;S!z
public Page(){ P}cGWfj
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} O%rjY
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/** construct the page by everyPage (d@lG*K
* @param everyPage c\n\gQ:LQ
* */ <
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public Page(int everyPage){ q4Q1Ib-<2
this.everyPage = everyPage; yY8q{\G
} xqIt?v2c
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/** The whole constructor */ -$t#AYKz
public Page(boolean hasPrePage, boolean hasNextPage, ]5B5J
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int everyPage, int totalPage, wQDKv'zU1
int currentPage, int beginIndex){ mI@]{K}Q%
this.hasPrePage = hasPrePage; @MTm8E6au
this.hasNextPage = hasNextPage; 0zetOlFbO
this.everyPage = everyPage; =fEn h'KE
this.totalPage = totalPage; zaa>]~g .
this.currentPage = currentPage; "4|D"|wI)
this.beginIndex = beginIndex; o[0Cv*
} ~[t%g9
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/** ]^p6dbzWe
* @return hgL wxJu
* Returns the beginIndex. "}Vow^vb
*/ &V:iy
publicint getBeginIndex(){ )u`q41!
return beginIndex; N\BB8<F
} ]^$3S
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/** Z~[ c65Nlu
* @param beginIndex ?vp'
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* The beginIndex to set. F$F,I,$ "
*/ ZkSlztL)Tr
publicvoid setBeginIndex(int beginIndex){ 3o5aB1
this.beginIndex = beginIndex; mfc\w'
} buu~#m1z
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/** Mj|\LF +
* @return ZF!cXo7d
* Returns the currentPage. FCgr
*/ P>j^w#$n
publicint getCurrentPage(){ Nk*d=vj
return currentPage; ^{lcj
} Fuq ;4UcbL
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/** GH[ATL
* @param currentPage #q#C_"
* The currentPage to set. H]As2$[
*/ 3 }~.#`QeY
publicvoid setCurrentPage(int currentPage){ (?4m0Sn>#h
this.currentPage = currentPage; jwhc;y
} |C"(K-do
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/** Uq/FH@E=
* @return [QwEidX|
* Returns the everyPage. i7D[5!
*/ ?i'N9 /(
publicint getEveryPage(){ 4:wVT;?a
return everyPage; ^m
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} uIh68UM
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/** @%iZT4`Ejf
* @param everyPage :`Kv\w.
* The everyPage to set. TP3KT)
*/ t^Z-0jH
publicvoid setEveryPage(int everyPage){ CZZwBt$P
this.everyPage = everyPage; a=_+8RyVQ
} y[`>,?ns5
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/** eYtP396C|
* @return nMM:Tr
* Returns the hasNextPage. <=nOyT9
*/ d)>b/0CZ
publicboolean getHasNextPage(){ wF=?EK(;P{
return hasNextPage; >:J7u*>$ '
} )x5t']w`K
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/** B)/L[ )S
* @param hasNextPage y:',)f }
* The hasNextPage to set. $U=j<^R}a
*/ XgI;2Be+&a
publicvoid setHasNextPage(boolean hasNextPage){ *q&^tn b
this.hasNextPage = hasNextPage; ~Z`Cu~7
} w%1-_;.aU6
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/** t p<v
* @return ?ESsma6
* Returns the hasPrePage. x?7z15\
*/ DuQW?9^232
publicboolean getHasPrePage(){ Y'y
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return hasPrePage; &>f]
} 0^3n#7m;K
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/** 6Vgxfic
* @param hasPrePage zx/$
* The hasPrePage to set. 7#&e0fw/I
*/ f"z;'
publicvoid setHasPrePage(boolean hasPrePage){ +!Q*ie+q
this.hasPrePage = hasPrePage; u!-v1O^[
} [*J?TNk
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/** 11vAx9
* @return Returns the totalPage. y?V^S;}&]
* %Yt;)q3U
*/ Kzx`
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publicint getTotalPage(){ @_$Un&eo
return totalPage; |It&1fz}
} "l{{H&d
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/** =9h!K:,k
* @param totalPage T/FZn{I
* The totalPage to set. ce[
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*/ OZ33w-X<
publicvoid setTotalPage(int totalPage){ ;|`<B7xf
this.totalPage = totalPage; u#y#(1
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} :uJHFF xg
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} +z[+kir
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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 P4zwTEk`
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个PageUtil,负责对Page对象进行构造: l-P6B9e|\
java代码: artn _
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/*Created on 2005-4-14*/ XjdHH.) S
package org.flyware.util.page; -k@1#c+z
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import org.apache.commons.logging.Log; 4*L*"vKa
import org.apache.commons.logging.LogFactory; Y9gw
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/** Z\]{{;%4b7
* @author Joa in5e *
* ' <xE0<
*/ rHM^_sYRb
publicclass PageUtil { ,q>cFsY=i?
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privatestaticfinal Log logger = LogFactory.getLog 0w:
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(PageUtil.class); yXoNfsv
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/** YU" /p|!1
* Use the origin page to create a new page 6VC|]
|*
* @param page L ph0C^8
* @param totalRecords jf- XVk5q
* @return /t<
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*/ [\#ANA"
publicstatic Page createPage(Page page, int y631;dU
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totalRecords){ oH+PlL
return createPage(page.getEveryPage(), dq@
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page.getCurrentPage(), totalRecords); 6dmb
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} UWEegFq*
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/** Z5n-3h!+ED
* the basic page utils not including exception 6)ibXbH
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handler -(F}=o'
* @param everyPage #*/nUbsg
* @param currentPage wn?oHz*
* @param totalRecords S6(48/
* @return page K}cA%Y
*/ @2L^?*n=
publicstatic Page createPage(int everyPage, int ?4U4o<
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currentPage, int totalRecords){ x'|9A?ez@Z
everyPage = getEveryPage(everyPage); $x`HmL3Sb
currentPage = getCurrentPage(currentPage); yNXYS
int beginIndex = getBeginIndex(everyPage, 6tVp%@
olo9YrHn
currentPage); p|;#frj
int totalPage = getTotalPage(everyPage, tx1TtWo
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totalRecords); PR7bu%Y*eD
boolean hasNextPage = hasNextPage(currentPage, t2.]v><