Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ;&W;
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 x'@32gv
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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 \Sw+]pr~
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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 7dlKdKH
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分页支持类: Yt/SnF
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java代码: S[L#M;n
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package com.javaeye.common.util; Q_QKm0!
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import java.util.List; )H;pGM:
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publicclass PaginationSupport { 0HHui7Yy>
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publicfinalstaticint PAGESIZE = 30; $c@w$2
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privateint pageSize = PAGESIZE; o9m
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privateList items; +
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privateint totalCount; pK6e/eC
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privateint[] indexes = newint[0]; mFqSD
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privateint startIndex = 0; _e?q4>B)c
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public PaginationSupport(List items, int 5!'R'x5e
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totalCount){ Y8)E]D
setPageSize(PAGESIZE); o~v_PD[S
setTotalCount(totalCount); *<*0".#
setItems(items); Z0[)u_<
setStartIndex(0);
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} *M>
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public PaginationSupport(List items, int XJx,9trH
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totalCount, int startIndex){ ]ZzoJ7lr
setPageSize(PAGESIZE); K<@[_W+
setTotalCount(totalCount); \C]i|]tl
setItems(items); ?xtt7*'D
setStartIndex(startIndex); `6a]|7|f
} I86e&"40
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public PaginationSupport(List items, int ?mH@`c,fM
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totalCount, int pageSize, int startIndex){ )Vwj9WD
setPageSize(pageSize); p=!#],[
setTotalCount(totalCount); #*!+b
setItems(items); `IEq@Wr#$!
setStartIndex(startIndex); 28nmQ
} \\=.6cg<K
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publicList getItems(){ zuUT S[
return items; Tr}R`6d$
} j((hqJr
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publicvoid setItems(List items){ w[
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this.items = items; - #3{{
} ; D1FAz
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publicint getPageSize(){ :3JCvrq
return pageSize; LO"_NeuL
} RnHQq'J|\
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publicvoid setPageSize(int pageSize){ |2z}Xm5\
this.pageSize = pageSize; 53B.2
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} iJ}2"i7M
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publicint getTotalCount(){ nz^nptw
return totalCount; *5e<\{!
} {5>3;.
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publicvoid setTotalCount(int totalCount){ /T,zZ9=
if(totalCount > 0){ Q/p(#/y#b
this.totalCount = totalCount; x8Q~VVZr
int count = totalCount / MFv
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pageSize; \I;cZ>{u"}
if(totalCount % pageSize > 0) GE@uOJ6H
count++; ?4,@,
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indexes = newint[count]; (#oYyM]
for(int i = 0; i < count; i++){ ~]&B>q
indexes = pageSize * qmEoqU
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} {ih:FcI
}else{ aVP5%
this.totalCount = 0; zhX;6= X2
} Mq@}snp"S
} %VWp&a8
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publicint[] getIndexes(){ Lx%:t YZ
return indexes; Uj,g]e8e
} $.a|ae|K
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publicvoid setIndexes(int[] indexes){ gwiR/(1
this.indexes = indexes; /l^y}o %?
} QWw"K$l
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publicint getStartIndex(){ FuuS"G,S
return startIndex; )A"jVQjI%w
} !N1J@LT5h
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publicvoid setStartIndex(int startIndex){ ]U[&uymax
if(totalCount <= 0) !Av1Leb9$
this.startIndex = 0; ZOu R"9]
elseif(startIndex >= totalCount) d@ZoV
this.startIndex = indexes =:gjz4}_8
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[indexes.length - 1]; dQ<(lzS~
elseif(startIndex < 0) j7}lF?cJ2
this.startIndex = 0; $T),DUYO
else{ Ukc'?p,*
this.startIndex = indexes 4[1k\
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[startIndex / pageSize]; y@3kU*-1
} =&2$/YX0D
} 0wFh%/:
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publicint getNextIndex(){ 3D[=b%2\
int nextIndex = getStartIndex() + P>wZ~Hjk
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pageSize; 4fty~0i=z
if(nextIndex >= totalCount) RM,'o[%
return getStartIndex(); 2ce'fMV
else q5p e~
return nextIndex; 3] ^'
} \f"1}f
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publicint getPreviousIndex(){ 1Nj=B_T
int previousIndex = getStartIndex() - 6m+W#]^
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pageSize; EwQae(PpA
if(previousIndex < 0) &XQZs`41+
return0; F\LsI;G
else x:
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return previousIndex; y(v_-6b
} @9vvR7{P
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} =dGKF`tR
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抽象业务类 JIxiklk
java代码: lFfXWNb
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/** 5UOk)rOf
* Created on 2005-7-12 rzu
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*/ 4AHL3@x
package com.javaeye.common.business; tU:FX[&?R
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import java.io.Serializable; d>!p=O`>{q
import java.util.List; 3cC }'j
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import org.hibernate.Criteria; O]qPmEj
import org.hibernate.HibernateException; H]Wp%"L
import org.hibernate.Session; \r;F2C0*i
import org.hibernate.criterion.DetachedCriteria; VAKy^nR5j
import org.hibernate.criterion.Projections; |zpx)8Q
import .pvxh|V
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org.springframework.orm.hibernate3.HibernateCallback; nwf7M#3d
import !8$RBD %
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org.springframework.orm.hibernate3.support.HibernateDaoS *#2Rvt*Ox
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upport; &N\[V-GP2G
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import com.javaeye.common.util.PaginationSupport; <Tx C!{<
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public abstract class AbstractManager extends %&<W(|U1<
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HibernateDaoSupport { &p"(-
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privateboolean cacheQueries = false; 0 {R/<N
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privateString queryCacheRegion; "^%Z'ou
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publicvoid setCacheQueries(boolean ut5yf$%
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cacheQueries){ CLN+I'uX0
this.cacheQueries = cacheQueries; =nVmthGw
} .mPg0
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publicvoid setQueryCacheRegion(String tt4+ m>/T
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queryCacheRegion){ O3%[dR
this.queryCacheRegion = ?63&g{vA
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queryCacheRegion; >V!LitdJ
} ]}LGbv"`A
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publicvoid save(finalObject entity){ )+Y&4Qu
getHibernateTemplate().save(entity); nb+m.X
} `="v>qN2\
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publicvoid persist(finalObject entity){ ;nB2o-%
getHibernateTemplate().save(entity); 6^YJ] w
} Sz0+<F#5
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publicvoid update(finalObject entity){ T9)wj][ .
getHibernateTemplate().update(entity); 9?`RR/w
} #Lka+l;L7
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publicvoid delete(finalObject entity){ R^P_{_I*"
getHibernateTemplate().delete(entity); -(;LQDG |
} t(?<#KUB-
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publicObject load(finalClass entity, .JAcPyK^
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finalSerializable id){ H_B~P%E@]
return getHibernateTemplate().load P5URvEnz:
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(entity, id); Y}.Ystem
} agsISu(
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publicObject get(finalClass entity, FH\CK
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finalSerializable id){ >q(6,Mmb
return getHibernateTemplate().get Ew4g'A:H
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(entity, id); |.w;r
} N@1p]\
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publicList findAll(finalClass entity){ w0Ij'=:
return getHibernateTemplate().find("from m6U8)!)T
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" + entity.getName()); Y';>O `
} wk ikD
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publicList findByNamedQuery(finalString B8~=RmWLl
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namedQuery){ #nEL~&
return getHibernateTemplate gX*K&*q
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().findByNamedQuery(namedQuery); ~B_ D@gV|
} RvW.@#EH0
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publicList findByNamedQuery(finalString query, .,mPdVof
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finalObject parameter){ h5-d;RKE
return getHibernateTemplate o#e7,O
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().findByNamedQuery(query, parameter); rJ(OAKnY
} oh\1>3,Ns
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publicList findByNamedQuery(finalString query, yWHne~!
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finalObject[] parameters){ Jz$>k$!UD
return getHibernateTemplate #F4X}
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().findByNamedQuery(query, parameters); a8JN19}D
} h7?.2Q&S
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publicList find(finalString query){ RgGA$HN/
return getHibernateTemplate().find F=i!d,S
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(query); ^<;w+%[MT
} kfCKhx
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publicList find(finalString query, finalObject F+*Q <a4
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parameter){ U**)H_S/~
return getHibernateTemplate().find Qa?aL
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(query, parameter); `a'`$'j
} vYzVY\
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public PaginationSupport findPageByCriteria wOcg4HlW
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(final DetachedCriteria detachedCriteria){ o<J5!
return findPageByCriteria xt))]aH
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); $e1:Q#den2
} <[9?Rj@
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public PaginationSupport findPageByCriteria (}0S1)7t
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(final DetachedCriteria detachedCriteria, finalint yFO)<GLk
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startIndex){ f".q9{+p,
return findPageByCriteria *(nJX.7
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(detachedCriteria, PaginationSupport.PAGESIZE, i;]CL[#2e`
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startIndex); $_bZA;EMQ
} fz8h]PZ
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public PaginationSupport findPageByCriteria kjX7- ZPY
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(final DetachedCriteria detachedCriteria, finalint LYNZP4(R
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pageSize, k}<<bm*f
finalint startIndex){ [Q:f-<nH
return(PaginationSupport) DO%Pwfkd
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getHibernateTemplate().execute(new HibernateCallback(){ ^Po,(iIn
publicObject doInHibernate K=o:V&
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(Session session)throws HibernateException { re q-Q |
Criteria criteria = lG 8dI\ `
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detachedCriteria.getExecutableCriteria(session); ki4Xp'IK
int totalCount = Iy.mVtcsZ
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((Integer) criteria.setProjection(Projections.rowCount ) H+d.Y
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()).uniqueResult()).intValue(); vlAy!:CV
criteria.setProjection ?cJA^W
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(null); Kk>DYHZ6y
List items = L,W:,i/C
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criteria.setFirstResult(startIndex).setMaxResults W
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vuW-}fY;
(pageSize).list(); +9jivOmK
PaginationSupport ps = -`g J
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new PaginationSupport(items, totalCount, pageSize, _E(x2BS?
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startIndex); /wlFD,+8
return ps; lm!FM`m
} n@_)fFD%
}, true); }9
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} N-xnenci
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public List findAllByCriteria(final r;$r=Uf r
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DetachedCriteria detachedCriteria){ 03C .Xh=!
return(List) getHibernateTemplate C,(j$Id
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().execute(new HibernateCallback(){ y{?Kao7Ij
publicObject doInHibernate 1B(G]o_>!
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(Session session)throws HibernateException { vLr&ay!w
Criteria criteria = `{Hb2
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detachedCriteria.getExecutableCriteria(session); $.;iu2iyo
return criteria.list(); |MVV +.X
} JLml#Pu4
}, true); ~PCTLP~zI
} DVbYShB
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public int getCountByCriteria(final $@68=
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DetachedCriteria detachedCriteria){ s
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Integer count = (Integer) \Ec
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getHibernateTemplate().execute(new HibernateCallback(){ Zi
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publicObject doInHibernate $vz_%Y
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(Session session)throws HibernateException { GsI[N%
Criteria criteria = 3F;EE:
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detachedCriteria.getExecutableCriteria(session); p1C_`f N,
return :J<Owh@
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criteria.setProjection(Projections.rowCount av"Dljc
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()).uniqueResult(); ?U=mcdqd
} gfV]^v
}, true); Tq.MubaO
return count.intValue(); <1TlW
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} cn@03&dAl
} ex{)mE4Cd
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用户在web层构造查询条件detachedCriteria,和可选的 ?.]o_L_K
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 )-MA!\=<
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PaginationSupport的实例ps。 b0!*mrF]6
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ps.getItems()得到已分页好的结果集 Q]yV:7
ps.getIndexes()得到分页索引的数组 1'(_>S5CG
ps.getTotalCount()得到总结果数 [Od>NO,n+]
ps.getStartIndex()当前分页索引 C3&17O6
ps.getNextIndex()下一页索引 3WQRN_
ps.getPreviousIndex()上一页索引
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 vo:52tCk}m
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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 ,-w-su=J_
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一下代码重构了。 o[5=S,'
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我把原本我的做法也提供出来供大家讨论吧: "Nk=g~|
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首先,为了实现分页查询,我封装了一个Page类: 1puEP*P
java代码: jhjW*F<u
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/*Created on 2005-4-14*/ .FfwY 'V
package org.flyware.util.page; >Hd~Ca>
3&drof\{
/** @p9e:[
* @author Joa ZuF4N=;
* ,d9%Ce.$2
*/ wiK@o$S-
publicclass Page { S0Rf>Eo4
?~]1Gd
/** imply if the page has previous page */ 1j${,>4tQ
privateboolean hasPrePage; r{Qs9
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/** imply if the page has next page */ &vJ(P!2f<
privateboolean hasNextPage; cEh0Vh-]
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/** the number of every page */ ~P"!DaAf
privateint everyPage; g%fJyk'
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/** the total page number */ LX(iuf+l
privateint totalPage; ulz\x2[Pf
s= GOB"G
/** the number of current page */ R%]9y]HQ
privateint currentPage; 3[|:sa8?s
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/** the begin index of the records by the current eaYkYuS/
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query */ V{AH\IV-
privateint beginIndex; BRSgB-Rr7
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/** The default constructor */ +,{Wcb
public Page(){ pdcwq~4~%
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} gn[$;*932z
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/** construct the page by everyPage 3wa<,^kqy
* @param everyPage !e#I4,f n
* */ QU,TAO
public Page(int everyPage){ HhY2`P8
this.everyPage = everyPage; upEPv
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} H[_uVv;}6
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/** The whole constructor */ :}3qZX
public Page(boolean hasPrePage, boolean hasNextPage, i Ks,i9j
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4MF}FS2)
int everyPage, int totalPage, gQk#l\w_
int currentPage, int beginIndex){ u=v%7c2Mx}
this.hasPrePage = hasPrePage; asmW
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this.hasNextPage = hasNextPage; x9o^9QJh
this.everyPage = everyPage; 8NF;k5
this.totalPage = totalPage; !+|N<`
this.currentPage = currentPage; 4f*Ua`E_
this.beginIndex = beginIndex; )R
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} }96/:
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/** +v[$lh+
* @return s>M~g,xTU
* Returns the beginIndex. .^`a6>EQ)|
*/ <*(UvOQuX
publicint getBeginIndex(){ &"j).Ogm4
return beginIndex; <cfH'~
} )r6SGlE[Y
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/** 6t mNfI34
* @param beginIndex J%O4IcE
* The beginIndex to set. _]~ht H
*/ m|cWX"#g
publicvoid setBeginIndex(int beginIndex){ v[yTk[zd0
this.beginIndex = beginIndex;
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} Hb AMoow!
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/** i>if93mpj
* @return D@b<}J>0'
* Returns the currentPage. Qpv}N*v^
*/ )Fr;'JYC1S
publicint getCurrentPage(){ 8$jT#\_
return currentPage; 4ysdna\+
} oQjB&0k4
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/** ^(m6g &$(
* @param currentPage Gv+Tg/
* The currentPage to set. "KI,3g _V
*/ }v$=mLy
publicvoid setCurrentPage(int currentPage){ =wR]X*Pan
this.currentPage = currentPage; g(Xg%&@KZ
} IweK!,:>dN
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/** Rd1ku=
* @return *I1W+W`G
* Returns the everyPage. wrb& ta
*/ Qx,$)|_
publicint getEveryPage(){
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return everyPage; I7z]%Z
} Q]g 4gj
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/** q{+poVX
* @param everyPage &MQt2aL
* The everyPage to set. y=qo-v59'
*/ AW;)_|xM
publicvoid setEveryPage(int everyPage){ 0V,MDX}#_
this.everyPage = everyPage; 6.7Kp
} (*WZsfk>/<
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