Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 QPT%CW61M
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 (b>B6W\&
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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 "qv J-Y
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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 <c$K3
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分页支持类: l!YjDm{E
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java代码: 55]E<2't
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package com.javaeye.common.util; i*-L_!cc:
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import java.util.List; y(uE
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publicclass PaginationSupport { l&4+v.zr
@Ap~Wok
publicfinalstaticint PAGESIZE = 30; >@wyiBU
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privateint pageSize = PAGESIZE; "J(W)\
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privateList items; {Mx3G*hr
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privateint totalCount; OD\F*Ry~
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privateint[] indexes = newint[0]; I? o)X!
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privateint startIndex = 0; ap[{`u
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public PaginationSupport(List items, int +{F2hEYP
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totalCount){ ="*:H)
setPageSize(PAGESIZE); .*zWm
setTotalCount(totalCount); NiCB.a
setItems(items); 7-u['nFJ
setStartIndex(0); hwR_<'!
} :xz,PeXo7
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public PaginationSupport(List items, int ]&mN~$+C
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totalCount, int startIndex){ [%`L sY
setPageSize(PAGESIZE); Ja@zeD)f"
setTotalCount(totalCount); S[zX@3eZV
setItems(items); Sb;=YW
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setStartIndex(startIndex); WzwH;!
} y$7vJl.uS/
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public PaginationSupport(List items, int ZFNn(n
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totalCount, int pageSize, int startIndex){ ][IEzeI_LN
setPageSize(pageSize); X>W2aDuEZ
setTotalCount(totalCount); 6|-V{
setItems(items); " A}S92
setStartIndex(startIndex); D%+cf
} yD-L:)@"
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publicList getItems(){ 1K`7
return items; vTdJe
} ;`f14Fb
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publicvoid setItems(List items){ g]V_)}
this.items = items; Tt.#O~2:9
} <V~B8C!)
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publicint getPageSize(){ KT>eE
return pageSize; ^z%ShmM&LZ
} &O:IRR7p
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publicvoid setPageSize(int pageSize){ `v|w&ty*
this.pageSize = pageSize; oieJ7\h]m
} 7%Q?BH7{
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publicint getTotalCount(){ pr) `7VuKp
return totalCount; NZTG)<
} T|%pvTIe
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publicvoid setTotalCount(int totalCount){ fVXZfq6
if(totalCount > 0){ E<~Fi.M;\
this.totalCount = totalCount; ;Eer
int count = totalCount / LrGLIt`
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pageSize; :"~SKJm
if(totalCount % pageSize > 0) |}-bMQ|
count++; 1LK`
indexes = newint[count]; L2,.af6+
for(int i = 0; i < count; i++){ P5K=S.g
indexes = pageSize * 2:6W_[7l!
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} 2YbI."ob
}else{ nc2=S^Fqu
this.totalCount = 0; 5{"v/nXV
} wqnHaWd*
} (^@rr[.o7
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publicint[] getIndexes(){ b4R;#rm
return indexes; cEK<CV
} IrMUw$
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publicvoid setIndexes(int[] indexes){ @fc-[pv
this.indexes = indexes; ]<xzCPB
} Ov-Y.+L:
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publicint getStartIndex(){ mp:xR ^5c
return startIndex; lZr}F.7
} kdP*{
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publicvoid setStartIndex(int startIndex){ cSD$I^$oq
if(totalCount <= 0) K$qY^oyQFw
this.startIndex = 0; _6,\;"it?8
elseif(startIndex >= totalCount) .81Y/Gad_
this.startIndex = indexes Z : xb8]y
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[indexes.length - 1]; rb4; @&
elseif(startIndex < 0) o8<~zeI
this.startIndex = 0; [:gg3Qzx
else{ lOeX5%$Z
this.startIndex = indexes 46e?%0(
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[startIndex / pageSize]; uF}dEDB|;
} "]q
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} ;ZAwf0~
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publicint getNextIndex(){ 9DM,,h<`
int nextIndex = getStartIndex() + lkJxb~S
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pageSize; N*&T)a
if(nextIndex >= totalCount) GwP!:p|
return getStartIndex(); 0KgP'oWvY
else %}zkmEY.e
return nextIndex; vw3[(_MV3_
} 0wVM%Dng
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publicint getPreviousIndex(){ \yw5`5g
int previousIndex = getStartIndex() - WLj]EsA.
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pageSize; p\;8?x
if(previousIndex < 0) w{[^
return0; gvWgw7z
else n
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return previousIndex; g.62XZF@
} t%^&b'/Z
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} Q{=r9&&
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抽象业务类 0>-}c>
java代码: [8Z#HjhQ
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/** OUwnVAZZ6
* Created on 2005-7-12 Mby4(M+&n
*/ -\%5aXr
package com.javaeye.common.business; l9j=;h
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import java.io.Serializable; J_yXL7d
import java.util.List; ]i,o+xBKH
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import org.hibernate.Criteria; S^D@8<6GJ
import org.hibernate.HibernateException; oz]3
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import org.hibernate.Session; W79.Nj2`
import org.hibernate.criterion.DetachedCriteria; "G*$#
import org.hibernate.criterion.Projections; 8n2;47 a
import &'Nzw2
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org.springframework.orm.hibernate3.HibernateCallback; L|s\IM1g
import 2$t%2>1>@
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org.springframework.orm.hibernate3.support.HibernateDaoS /D|q-`*K
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upport; >e.KD)qA
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import com.javaeye.common.util.PaginationSupport; U6H3T0#
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public abstract class AbstractManager extends L"S2+F)n
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HibernateDaoSupport { K(lVAKiP]
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privateboolean cacheQueries = false; %8Y+Df;ax
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privateString queryCacheRegion; Kf$(7FT'`
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publicvoid setCacheQueries(boolean v7#|%
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cacheQueries){ o#z$LT1dY
this.cacheQueries = cacheQueries; xA-?pLt"G
} 5~2_wWjX
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publicvoid setQueryCacheRegion(String 61gyx6v
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queryCacheRegion){ *O[/-
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this.queryCacheRegion = 9pS:#hg
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queryCacheRegion; j]R[;8g
} Q uw|KL
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publicvoid save(finalObject entity){ NNE(jJ`/
getHibernateTemplate().save(entity); CM[83>
} Pq(LW(
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publicvoid persist(finalObject entity){ BTG_c_?]e
getHibernateTemplate().save(entity); 1Qz@
} '<1Cta`
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publicvoid update(finalObject entity){ tw\1&*:
getHibernateTemplate().update(entity); R>;&4Sjr
} g4 +Hq *
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publicvoid delete(finalObject entity){ Iu >4+6
getHibernateTemplate().delete(entity); b+hN\/*]
} }? c%L8\
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publicObject load(finalClass entity, w8J8III\~
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finalSerializable id){ (pd~ 2!;C
return getHibernateTemplate().load PDCb(5
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(entity, id); KU+\fwYpnk
} p0]\QM l1
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publicObject get(finalClass entity, 4*5 e0:O
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finalSerializable id){ DBLM0*B
return getHibernateTemplate().get #5'@at'1
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(entity, id); #e,TS`"eD
} twbxi{8e.
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publicList findAll(finalClass entity){ tLq]#9kL
return getHibernateTemplate().find("from uwZ,l-6T
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" + entity.getName()); 7l~^KsX
} Y%- !%|
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publicList findByNamedQuery(finalString cL;%2TMk
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namedQuery){ HuU$x;~
return getHibernateTemplate 748:*
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().findByNamedQuery(namedQuery); J[hmY= ,
} W83PMiN"T-
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publicList findByNamedQuery(finalString query, q 5z^y(Sv
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finalObject parameter){ o9]32l
return getHibernateTemplate e.%I#rNI
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().findByNamedQuery(query, parameter);
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} Dc$q0|N=z
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publicList findByNamedQuery(finalString query, y %61xA`#
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finalObject[] parameters){ U1E@pDH
return getHibernateTemplate 5dN>Xjpu
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().findByNamedQuery(query, parameters); =N{?ll6x7g
} @fp@1n
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publicList find(finalString query){ +pYwc0~
return getHibernateTemplate().find ~K3Lbd|
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(query); 5YNAb/!!F
} JmK
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publicList find(finalString query, finalObject l9=Ka{$^*
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parameter){ ?&eS }skL
return getHibernateTemplate().find -bOtF%
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(query, parameter); yx-"&K=`
} mH ju$d
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public PaginationSupport findPageByCriteria cyB+(jLHDs
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(final DetachedCriteria detachedCriteria){ #TR!x,Hc
return findPageByCriteria *K$a;2WjzG
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Zn
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} $poIWJM c
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public PaginationSupport findPageByCriteria Qu=b-9
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(final DetachedCriteria detachedCriteria, finalint =CD6x=
l6
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startIndex){ ~zac.:a8
return findPageByCriteria \ 9V_[xD+
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(detachedCriteria, PaginationSupport.PAGESIZE, 5Wa)_@qI)`
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startIndex); '*rS,y
} (n?f016*%d
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public PaginationSupport findPageByCriteria hN=kU9@knC
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(final DetachedCriteria detachedCriteria, finalint R"O%##Ws
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pageSize, M*3G
finalint startIndex){ %pOz%v~
return(PaginationSupport) SWI\;:k
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getHibernateTemplate().execute(new HibernateCallback(){ 6 *S/frE
publicObject doInHibernate *#}=>, v
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(Session session)throws HibernateException { iz/CC V L
Criteria criteria = 5p!{#r6m
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detachedCriteria.getExecutableCriteria(session); ~Uv#)
int totalCount = 7ixG{yu
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((Integer) criteria.setProjection(Projections.rowCount H'YK j'
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()).uniqueResult()).intValue(); ,WOCG2h
criteria.setProjection ~?b1x+soV
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(null); ,{q#U3
List items = DIQ30(MS
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criteria.setFirstResult(startIndex).setMaxResults L9Zz-Dr s
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(pageSize).list(); [T7&)p
PaginationSupport ps = ]SU)L5Dt;
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new PaginationSupport(items, totalCount, pageSize, ?OnL,y|
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startIndex); *:
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return ps; ~x'8T!M{
} ?F[_5ls|]
}, true); ;rL1[qwk
} ceks~[rP
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public List findAllByCriteria(final + XBF,<P
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DetachedCriteria detachedCriteria){ v
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return(List) getHibernateTemplate {RI^zNgs[
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().execute(new HibernateCallback(){ N@<-R<s^
publicObject doInHibernate $RI$VyAjD
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(Session session)throws HibernateException { X}3?k<m
Criteria criteria = v:74iB$i/C
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detachedCriteria.getExecutableCriteria(session); OMjPC_
return criteria.list(); hC<E4+5.,
} mpwh=
}, true); {_\dwe9
}
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public int getCountByCriteria(final }I}GA:~$%
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DetachedCriteria detachedCriteria){ `/R. 5;$|
Integer count = (Integer) S\I+UeFkf
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getHibernateTemplate().execute(new HibernateCallback(){ ~0-)S@
publicObject doInHibernate i}>EGmv m
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(Session session)throws HibernateException { yCkc3s|DA;
Criteria criteria = |p*cI @
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detachedCriteria.getExecutableCriteria(session); K`X'Hg#_P2
return 94
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criteria.setProjection(Projections.rowCount >HwVP.~HN
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()).uniqueResult(); ;IPk+,hpmi
} ]QHZ[C
}, true); CcV@YST?
return count.intValue(); #!TlalV
} dQp>z%L)
} ~n0Exw(
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用户在web层构造查询条件detachedCriteria,和可选的 S%?>Mh?g
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 c@]G;> o
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PaginationSupport的实例ps。 8>vNa
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ps.getItems()得到已分页好的结果集 dn=srbJ
ps.getIndexes()得到分页索引的数组 86qQ"=v
ps.getTotalCount()得到总结果数 dn42'(p@G
ps.getStartIndex()当前分页索引 $'!n4}$}
ps.getNextIndex()下一页索引 5?(dI9A"K
ps.getPreviousIndex()上一页索引 <H<Aba9\
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 @#o7U
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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 91a);d
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一下代码重构了。 MD4mh2
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我把原本我的做法也提供出来供大家讨论吧: +Ezl.O@z
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首先,为了实现分页查询,我封装了一个Page类: \b)P4aL
java代码: Bz:Hp{7&
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/*Created on 2005-4-14*/ fR2,NKM@
package org.flyware.util.page; oc-o>H
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/** l<"B[
* @author Joa 5*B'e{C
* ^ 6t"A
*/ Cf<TDjU`|
publicclass Page { @k:@mzB7R
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/** imply if the page has previous page */ 9]{Ss$W3x
privateboolean hasPrePage; t[ b(erO'
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/** imply if the page has next page */ 0q1+5
privateboolean hasNextPage; 5rA>2<\pQ
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/** the number of every page */ hSh^A5
/
privateint everyPage; <`A!9+
t#]VR7]
/** the total page number */ dW^#}kN7V
privateint totalPage; k5)IBO
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t_
/** the number of current page */ GsqO^SV
privateint currentPage; hH?ke(&=f
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/** the begin index of the records by the current ^M1O)
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query */ fX&g. fH
privateint beginIndex; bG)6p05Oa
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/** The default constructor */ lg jY\?
public Page(){ D6FG$SV
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} m{6*ae
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/** construct the page by everyPage yv5c0G.D
* @param everyPage %U97{y
* */ CT{X$N
public Page(int everyPage){ [rhK2fr:i
this.everyPage = everyPage; vmtmiN8;d
} j0e1CSE
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/** The whole constructor */ y;LZX-Z-
public Page(boolean hasPrePage, boolean hasNextPage, jATN):8W
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int everyPage, int totalPage, C5#$NV99p
int currentPage, int beginIndex){ k%cT 38V*
this.hasPrePage = hasPrePage; (K>4^E8
this.hasNextPage = hasNextPage; #!M;4~Sfx
this.everyPage = everyPage; s.@DI|Gnf
this.totalPage = totalPage; *IC9))PGJ
this.currentPage = currentPage; l8!n!sC[,
this.beginIndex = beginIndex; [UaM}-eR
} ?u M2|Nk
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/** :U#4H;kk~j
* @return p4wXsOQ}
* Returns the beginIndex. k%ckV`y
*/ +P
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publicint getBeginIndex(){ kR(hUc1O
return beginIndex; \Ot,&Z k2
} nSV
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/** Ps7Bt(/
* @param beginIndex t[ ^68]
* The beginIndex to set. ^Zw1X6C5~
*/ I)X33X,
publicvoid setBeginIndex(int beginIndex){ /=ro$@
this.beginIndex = beginIndex; v`pIovn
} |B.tBt^
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/** *b]$lj
* @return |Orp:e!
* Returns the currentPage. ;3WVrYe
*/ *J] }bX
publicint getCurrentPage(){ c2<JS:!*
return currentPage;
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} Kr|9??`0E
}*I:0"WH
/** D^9r#&
* @param currentPage \"@BZ.y
* The currentPage to set. Z-,'M tD
*/ n$}Cj}eju
publicvoid setCurrentPage(int currentPage){ d@-bt s&3
this.currentPage = currentPage; Fv"jKZPgzz
} X8 (,
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/** yb:Xjg7
* @return *^q%b/ f
* Returns the everyPage. Jx8?x#}
*/ kG>d^K
publicint getEveryPage(){ 0R%R2p'wG
return everyPage; 2'zYrdem
} yQxzFy
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/** 8QN#PaY
* @param everyPage ?|t9@r
* The everyPage to set. 5g3D}F>OJ
*/ )ieT/0nt
publicvoid setEveryPage(int everyPage){ P=%'2BQ{{
this.everyPage = everyPage; 4iiW{rh4
} uIkB&