Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 3d81]!n
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 uW4wTAk;qh
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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 H68~5lJY^]
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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 |b^+=
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分页支持类: q47:kB{d
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java代码: wR]jJbF
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package com.javaeye.common.util; yDe6f(D
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import java.util.List; O~~WP*N
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publicclass PaginationSupport { |X6/Y@N
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publicfinalstaticint PAGESIZE = 30; Nt'6Y;m!
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privateint pageSize = PAGESIZE; rO3.%B}
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privateList items; MFzJ 8^.1R
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privateint totalCount; R.'-jvO
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privateint[] indexes = newint[0]; :)=>,XwL8
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privateint startIndex = 0; l\t\DX"s_
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public PaginationSupport(List items, int F)n^pT
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totalCount){ 0+dc
setPageSize(PAGESIZE); J<;@RK,c_
setTotalCount(totalCount); 9S_PZH
setItems(items); vOQ
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setStartIndex(0); 1=U NA :t<
} 68 \73L=
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public PaginationSupport(List items, int d.3cd40Q
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totalCount, int startIndex){ cN3!wE
setPageSize(PAGESIZE); CyXFuk!R
setTotalCount(totalCount); Wb{0UkApJ
setItems(items); {a9(
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setStartIndex(startIndex); '
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} ='G-wX&k
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public PaginationSupport(List items, int 0aM&+j\q}
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totalCount, int pageSize, int startIndex){ ATzFs]~K;
setPageSize(pageSize); dn1Fwy.
setTotalCount(totalCount); ?%A9}"q]
setItems(items); ;Y9-0W
setStartIndex(startIndex); ?[VL
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} #UesXv
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publicList getItems(){ j[Q9_0R~lR
return items; `~k`m{4.a
} 6Q*Zy[=
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publicvoid setItems(List items){ e%_J
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this.items = items; pt$\pQ
} ?RQ_LA;
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publicint getPageSize(){ G nPrwDB
return pageSize; ORx6r=zg
} ISHzlEY
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publicvoid setPageSize(int pageSize){ W7#dc89}
this.pageSize = pageSize; 4&kC8
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} SxI-pH'
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publicint getTotalCount(){ H! P$p-*.
return totalCount; Ji)Ys
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} (L<qJd1Q
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publicvoid setTotalCount(int totalCount){ "IN[(
if(totalCount > 0){ F}~qTF;H
this.totalCount = totalCount; `Kbf]"4q
int count = totalCount / =6'Fm$R
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pageSize; g{^~g
if(totalCount % pageSize > 0) @1N.;]|
count++; b/"gUYo
indexes = newint[count]; jS ?#c+9
for(int i = 0; i < count; i++){ Ozg,6&3ji
indexes = pageSize * |Kb
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} R-YNg
}else{ $0Ys{m
this.totalCount = 0; )G),iy
} goe%'k,
} uaE,F^p
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publicint[] getIndexes(){ I0*N
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return indexes; ot0g@q[3
} [,3E#+y
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publicvoid setIndexes(int[] indexes){ q P0UcG
this.indexes = indexes; 6 2#@Y-5
} vmg[/#
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publicint getStartIndex(){ EU7nS3K)O~
return startIndex; Ma4eu8
} G.r .Z0
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publicvoid setStartIndex(int startIndex){ OLo?=1&;;
if(totalCount <= 0) eA*We
this.startIndex = 0; M@JW/~p'
elseif(startIndex >= totalCount) 6"?#E[ #[
this.startIndex = indexes +p[O|[z
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[indexes.length - 1]; r
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elseif(startIndex < 0) +IMt$}7[
this.startIndex = 0; &c} 2[=
else{ Cn0s?3Fm
this.startIndex = indexes Sk:x.oOZ
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[startIndex / pageSize]; w/:ibG@
} TqSjL{l%
} ~k%XW$cV
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publicint getNextIndex(){ }t:*w
int nextIndex = getStartIndex() + r9*6=*J|
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pageSize; Nf)SR#;
if(nextIndex >= totalCount) 7nBX@Uo
return getStartIndex(); 8
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else 0dQ\Y]b
return nextIndex; Al]*iw{
} !@*= b1
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publicint getPreviousIndex(){ :sw@1
int previousIndex = getStartIndex() - @iMF&\KC
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pageSize; u{w,y.l1h
if(previousIndex < 0) Q,Y^9g"B`~
return0; ]omBq<ox'Y
else _k;HhLj`
return previousIndex; g[HuIn/
} lon9oraF'
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} L4ct2|w}ul
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抽象业务类 <>Ha<4A
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java代码: v T
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/** OEX\]!3_Fm
* Created on 2005-7-12 V6h8+|hK
*/ (9=E5n6o
package com.javaeye.common.business; 1*'gaa&y
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import java.io.Serializable; BjfTt:kY
import java.util.List; Ed{sC[j=
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import org.hibernate.Criteria; 0LSJQ9\p
import org.hibernate.HibernateException; ksJ 1:_
import org.hibernate.Session; hs:iyr]@9
import org.hibernate.criterion.DetachedCriteria; ]=]MJ3_7
import org.hibernate.criterion.Projections; SG1AYUs
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import .<xD'54
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org.springframework.orm.hibernate3.HibernateCallback; e\f\CMb
import Z c#Jb
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org.springframework.orm.hibernate3.support.HibernateDaoS ?AQA>D#W
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upport; =Zsxl]h
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import com.javaeye.common.util.PaginationSupport; dWe%6s;
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public abstract class AbstractManager extends `*`ZgTV
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HibernateDaoSupport { S v#,L8f
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privateboolean cacheQueries = false; -V[!qI
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privateString queryCacheRegion; -)KNsW
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publicvoid setCacheQueries(boolean I3i zLi
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cacheQueries){ 'z)cieFKP
this.cacheQueries = cacheQueries; ^gNbcWc7CU
} 86dz Jh
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publicvoid setQueryCacheRegion(String <Lt"e8Z> x
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queryCacheRegion){ \5=4!Ez
this.queryCacheRegion = "{3|(Qs
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queryCacheRegion; T!pZj_ h=
} 4!-R&<TLve
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publicvoid save(finalObject entity){ D~`RLPMk
getHibernateTemplate().save(entity); &Fjyi"8(r
} (Kg)cc[B`
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publicvoid persist(finalObject entity){ -Ekf T_
getHibernateTemplate().save(entity); ~DB:/VSmu
} lL5* l,)To
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publicvoid update(finalObject entity){ 6Bexwf<u
getHibernateTemplate().update(entity); XaoVv2=G~
} vBM<M3
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publicvoid delete(finalObject entity){ > %Hw008
getHibernateTemplate().delete(entity); /rK/l
} CP$,fj
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publicObject load(finalClass entity, Nd@/U
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finalSerializable id){ IF<T{/MA
return getHibernateTemplate().load +@7c:CAy(
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(entity, id); 4<5*HpW
} W3^^aD-
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publicObject get(finalClass entity, &Wk:>9]Jrb
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finalSerializable id){ xtK\-[n
return getHibernateTemplate().get NCgKWyRR
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(entity, id); ,wngS=
} hoLA*v2<
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publicList findAll(finalClass entity){ yI^7sf7k
return getHibernateTemplate().find("from R*2F)e\|
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" + entity.getName()); -lR7
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}
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publicList findByNamedQuery(finalString $#(j2sL1
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namedQuery){ .hnq>R\
return getHibernateTemplate p6ryUJc6
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().findByNamedQuery(namedQuery); nYe:$t3F=
} 9Q'[>P=1
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publicList findByNamedQuery(finalString query, )KGz -!1c
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finalObject parameter){ Qj$w7*U
return getHibernateTemplate wJ"]H!r0
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().findByNamedQuery(query, parameter);
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} UD9JE S,
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publicList findByNamedQuery(finalString query, hD4>mpk
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finalObject[] parameters){ rK|("
return getHibernateTemplate U*,\UF
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().findByNamedQuery(query, parameters); OL_jU2,fv
} fK2r6D9
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publicList find(finalString query){ ) $0>L5d:
return getHibernateTemplate().find mu5r4W47
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(query); |dDKO
} ZT8LMPC
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publicList find(finalString query, finalObject "oyBF CW
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parameter){ KP7 {
return getHibernateTemplate().find wuW{2+)B
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(query, parameter); 'sE["eC
} h@o6=d=4
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public PaginationSupport findPageByCriteria 4YR{
*
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(final DetachedCriteria detachedCriteria){ 96P&+
return findPageByCriteria FZIC|uz
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); K\59vtga
} p#_5w
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public PaginationSupport findPageByCriteria M|zTs\1I
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(final DetachedCriteria detachedCriteria, finalint ^P*-bV4
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startIndex){ D wr 9}Z-]
return findPageByCriteria 1
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(detachedCriteria, PaginationSupport.PAGESIZE, B*w]yL(
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startIndex); &]shBvzl^
} YD0hDp
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public PaginationSupport findPageByCriteria WtaOf_
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(final DetachedCriteria detachedCriteria, finalint .wyuB;:
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pageSize, 1iNMgA
finalint startIndex){ l2}X\N&q
return(PaginationSupport) %g{)K)$,ui
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getHibernateTemplate().execute(new HibernateCallback(){ rHk,OC
publicObject doInHibernate (|rf>=B+H
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(Session session)throws HibernateException { f-ceDn
Criteria criteria = O&yAFiCd
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detachedCriteria.getExecutableCriteria(session); DHv86TvJt
int totalCount = qvK/}
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((Integer) criteria.setProjection(Projections.rowCount *?]<=IV?
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()).uniqueResult()).intValue(); +."cbqGP_q
criteria.setProjection wf &Jd:)4t
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(null); :FfEjNil
List items = C/#pK2xY
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criteria.setFirstResult(startIndex).setMaxResults } .Z`
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(pageSize).list(); -mn/Yv
PaginationSupport ps = U zc p
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new PaginationSupport(items, totalCount, pageSize, gmgri
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startIndex); E2YVl%.
return ps; R=<::2_Y96
} <\O8D0.d
}, true); EhM=wfGKw
} 5J|S6x\
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public List findAllByCriteria(final +,AzxP
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DetachedCriteria detachedCriteria){ N6\rjYx+7
return(List) getHibernateTemplate 5pe)CjE:
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().execute(new HibernateCallback(){ Wf"GA i
publicObject doInHibernate EU%v
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(Session session)throws HibernateException { 7pQ5`;P
Criteria criteria = KK2YT/K$SG
kp* !
detachedCriteria.getExecutableCriteria(session); g?Nk-cg
return criteria.list(); !ehjLFS? _
} p9u*l
}, true); E;x-O)(&
} F[yofRN
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public int getCountByCriteria(final !rAH@y.l
;-@: }/
DetachedCriteria detachedCriteria){ TK[[6IB
Integer count = (Integer) s(5hFuyg
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getHibernateTemplate().execute(new HibernateCallback(){ 4K~=l%l
publicObject doInHibernate :r hB=
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(Session session)throws HibernateException { f_[dFKoX
Criteria criteria = u/6if9B
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detachedCriteria.getExecutableCriteria(session); Qkx*T9W
return yq k8)\p
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criteria.setProjection(Projections.rowCount .'_}:~
: slO0
()).uniqueResult(); 9?hZf$z
} jS[=Zx`
}, true); Nr `R3(X
return count.intValue(); LO)!Fj4|
} 5R~M@
} 5$'[R;r
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用户在web层构造查询条件detachedCriteria,和可选的 _.V5-iN
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 JZ`h+fAt
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PaginationSupport的实例ps。 UCfouQ Cj
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ps.getItems()得到已分页好的结果集 jQ3dLctn
ps.getIndexes()得到分页索引的数组 G"J
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ps.getTotalCount()得到总结果数 iJ^}{-
ps.getStartIndex()当前分页索引 !37I2*+4
ps.getNextIndex()下一页索引 oo &|(+"O_
ps.getPreviousIndex()上一页索引 df@N V Ld
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 y-nv#Ejr
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 5G\OINxy
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一下代码重构了。 vbeE}7 *2
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我把原本我的做法也提供出来供大家讨论吧: y.D+M$f
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首先,为了实现分页查询,我封装了一个Page类: X5/fy"g&
java代码: 6[ 3 K@
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/*Created on 2005-4-14*/ FsWp>}o
package org.flyware.util.page; %|}*xMQ
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/** dV
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* @author Joa ydO+=R0M
* iY07lvG<
*/ \UZGXk
publicclass Page { 3\j`g
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/** imply if the page has previous page */ 1 mJUlx
privateboolean hasPrePage; 77[TqRLf
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/** imply if the page has next page */ ^Z9bA( w8
privateboolean hasNextPage; <#?dPDMG.*
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/** the number of every page */ s(fkb7W,gO
privateint everyPage; O@@nGSc@
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/** the total page number */ V1M|p!
privateint totalPage; };rp25i
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/** the number of current page */ ',`Qx{tQ)
privateint currentPage; J#Y0R"fo
$*X?]?
/** the begin index of the records by the current /
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query */ "!Ph
privateint beginIndex; Ewkx4,`Ff
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/** The default constructor */ o?/H<k\5
public Page(){ 08jk~$%
u
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} g$e|y#Ic$
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/** construct the page by everyPage jG&HPVr
* @param everyPage !l#aq\:}~e
* */ ]'%
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public Page(int everyPage){ x[TLlV:{
this.everyPage = everyPage; 6;Z`9PGp
} C;:=r:bth
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/** The whole constructor */ FYFlh^}
public Page(boolean hasPrePage, boolean hasNextPage, >%`SXB&9
.
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int everyPage, int totalPage, _/Ve~(
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int currentPage, int beginIndex){ (|AZO!
this.hasPrePage = hasPrePage; X(E`cH
|
this.hasNextPage = hasNextPage; #]1jvB
this.everyPage = everyPage; |)>+&
xk
this.totalPage = totalPage; UmpHae
this.currentPage = currentPage; \41/84BA
this.beginIndex = beginIndex; .9ZK@xM&?
} om`B:=+
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/** ;&|I/MVm
* @return ]SAY\;,_
* Returns the beginIndex. qm/>\4eLt
*/ {Lv"wec*x
publicint getBeginIndex(){ :F6dXW
return beginIndex; dr"$@
} ) P9]/y
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/** M1/(Xla3
* @param beginIndex 'C7R*
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* The beginIndex to set. S)ipkuj X
*/ CzreX3i
publicvoid setBeginIndex(int beginIndex){ "@VYJ7.1
this.beginIndex = beginIndex; cX1?4e8
} .'66]QW
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/** TT(R<hL
* @return 7P2(q
* Returns the currentPage. p9G+la~;VM
*/ 3
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publicint getCurrentPage(){ Yg5o!A
return currentPage; .?APDr"QQH
} \6 J Y#%
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/** ?m5"|f\
* @param currentPage 'z}9BGR!
* The currentPage to set. k1g-%DB
*/ l%Ke>9C
publicvoid setCurrentPage(int currentPage){ R*cef
this.currentPage = currentPage; W.{+0xx
} H~#$AD+H
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/** uAnL`
* @return W!" $g
* Returns the everyPage. g2?W@/pa
*/ &?p(UY7'"
publicint getEveryPage(){ b-VQn5W
return everyPage; $$p +~X
} jdVj
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/** QhTn9S:D
* @param everyPage t5b cQ@Y
* The everyPage to set. @kDY c8 t9
*/ jT0iJ?d,!
publicvoid setEveryPage(int everyPage){ %/\sn<6C}
this.everyPage = everyPage; =ePwGm1:c
} z7?SuJ
R=Ig !s9
/** 80%"2kG
* @return
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* Returns the hasNextPage. Z3wdk6%:}
*/ !a V:T&6
publicboolean getHasNextPage(){ N@Ap|`Ei
return hasNextPage; ^Ar1V!PFk
} .i )K#82
U3]/ NV*
/**
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* @param hasNextPage # ^,8JRA
* The hasNextPage to set. /8:e|
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*/ +6+1N)L
publicvoid setHasNextPage(boolean hasNextPage){ Kn1u1@&Xd
this.hasNextPage = hasNextPage; {_4Hsw?s6
} s H'FqV,)
8 *m,#
/** z\,
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* @return &uaSp,L
* Returns the hasPrePage. l(3PxbT
*/ VFq\{@-
%
publicboolean getHasPrePage(){ ".AW
return hasPrePage; V1nqEdhk
} beYGP
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/** {EoZ}I
* @param hasPrePage )9/iH(
* The hasPrePage to set. `;R$Ji=>
*/ I%[Tosud<
publicvoid setHasPrePage(boolean hasPrePage){ K4|fmgcy.
this.hasPrePage = hasPrePage; fCs{%-6cP
} $b^ niL
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/** u@Ni *)p`
* @return Returns the totalPage. 1:DA{ejS
* 7r(c@4yPI
*/ 6 AY~>p
publicint getTotalPage(){ })mD{c/
return totalPage; ^^uY)AL
} 6P(jc
) .V,zmI
/** X?r$o>db
* @param totalPage e&(Wn2)o
* The totalPage to set. P()&?C
*/ +WR'\15u
publicvoid setTotalPage(int totalPage){ BdvpG
this.totalPage = totalPage; u
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} $_a/!)bP
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} X`E}2|q'
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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 JAwEu79sh
`09[25?
个PageUtil,负责对Page对象进行构造: ]P^3uXi
java代码: 5Ktll~+:#
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/*Created on 2005-4-14*/ ST0|2)Lh"
package org.flyware.util.page; I.2>d_^<
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import org.apache.commons.logging.Log; & )-fC
import org.apache.commons.logging.LogFactory; *li5/=UC5*
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/** ?IO3w{fmH
* @author Joa ypA 9WF
* Kt"4<'
*/ ^(qR({cX
publicclass PageUtil { $z@nT.x5
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privatestaticfinal Log logger = LogFactory.getLog Yka>r9wr
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(PageUtil.class); c-?0~A
,;=is.h9
/** Ao9|t;i
* Use the origin page to create a new page $*9:a3>zny
* @param page {]y!2r
* @param totalRecords C*Y0GfW=
* @return E3_ 5~>
*/ $fW8S8
publicstatic Page createPage(Page page, int m?1AgsBR
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totalRecords){ evyA#~o
return createPage(page.getEveryPage(), t$uj( y>
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page.getCurrentPage(), totalRecords); 8U-<Q>
} xl@
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/** 73E[O5?b
* the basic page utils not including exception d]l(B+\vf
GYri\ <[
handler
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* @param everyPage (ZK(ODn)i
* @param currentPage I9jzR~T
* @param totalRecords 1,sD'iNb
* @return page u|&a!tOf2
*/ _
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publicstatic Page createPage(int everyPage, int )G$0:-J-
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F
currentPage, int totalRecords){ |?uUw$oh
everyPage = getEveryPage(everyPage); :YN,cI d*
currentPage = getCurrentPage(currentPage); ;c>IM]
int beginIndex = getBeginIndex(everyPage, U\tujK1
Bf6\KI<