Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 bXcDsP$.
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 jRz2l`~7#
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 75Xi%mlE7
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 LS:3Dtq
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分页支持类: ]a%
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java代码: f_1#>]
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package com.javaeye.common.util; yHW=,V.
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import java.util.List; &s!"pEZWck
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publicclass PaginationSupport { Hfer\+RX
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publicfinalstaticint PAGESIZE = 30; .%+`e
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privateint pageSize = PAGESIZE; fShf4G_w\
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privateList items; pL$UI3VCP
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privateint totalCount; I`h9P2~
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privateint[] indexes = newint[0]; IY|;}mIF
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privateint startIndex = 0; @aR! -}
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public PaginationSupport(List items, int <i'4EnO
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totalCount){ *(ex:1sW
setPageSize(PAGESIZE); ZTG*|
setTotalCount(totalCount); ?uUK9*N
setItems(items); +3e(psdg
setStartIndex(0); ]B>Y
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} [KkLpZG
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public PaginationSupport(List items, int {! RW*B
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totalCount, int startIndex){ cL*D_)?8
setPageSize(PAGESIZE); E0=-6j
setTotalCount(totalCount); 'MKkC(]4
setItems(items); Ty%4#9``0
setStartIndex(startIndex); .<v0y"amJ
} ToJV.AdfT
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public PaginationSupport(List items, int 2F-!SI
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totalCount, int pageSize, int startIndex){ 84P^7[YX>
setPageSize(pageSize); 87EI<\mP
setTotalCount(totalCount); );$Uf!v4
setItems(items);
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setStartIndex(startIndex); pTZPOv#?Q
} 0CY_nn#3
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publicList getItems(){ #{(?a.:
return items; !mpRLBH
} D8_m_M|P
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publicvoid setItems(List items){ ?n/:1LN,
this.items = items; h 88iZK
} xkl'Y *
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publicint getPageSize(){ ;9c3IK@
return pageSize; EF0{o_
} n6WSTh
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publicvoid setPageSize(int pageSize){ pRXA!QfO
this.pageSize = pageSize; j._9;HifZ
} ltt%X].[
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publicint getTotalCount(){ ))!Z2PfD
return totalCount; \~xsBPX+x
} .CI]8O"3y
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publicvoid setTotalCount(int totalCount){ z>k6 T4(
if(totalCount > 0){ >0+m
this.totalCount = totalCount; 133lIX+(k
int count = totalCount / 5<4njo?k
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pageSize; .D^k0V
if(totalCount % pageSize > 0) 2U>1-p&dn
count++; xN2M|E]
indexes = newint[count]; -9-%_=6
for(int i = 0; i < count; i++){ ^/R@bp#<
indexes = pageSize * -'{ioHt&X/
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} 7*^\mycv
}else{ 8nES=<rz
this.totalCount = 0; n_v c}ame
} '.atbl
} m*P~X*St
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publicint[] getIndexes(){ /j
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return indexes; \UJ:PW$7
} o&*1Mx<+
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publicvoid setIndexes(int[] indexes){ NNutpA}s
this.indexes = indexes; x:;8U i"&B
} UOF5&>MLb
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publicint getStartIndex(){ |Uy hH^
return startIndex; (5-"5<-@R
} e@k
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publicvoid setStartIndex(int startIndex){ %Iv+Y$'3B
if(totalCount <= 0) Xa<siA{
this.startIndex = 0; xi;SKv;p
elseif(startIndex >= totalCount) z^~uq:
this.startIndex = indexes S_c#{4n
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[indexes.length - 1]; ,0<|&D
elseif(startIndex < 0) QEUg=*3W=
this.startIndex = 0; }5OlX
else{ ,a$LT
this.startIndex = indexes 4s`*o/it
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[startIndex / pageSize]; Zi7(lG
} Dr(.|)hv[&
} I"sKlMD
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publicint getNextIndex(){ ]t0?,q.$7
int nextIndex = getStartIndex() + 6JRee[
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pageSize; xkUsZ*X8B
if(nextIndex >= totalCount) Ofqe+C
return getStartIndex(); '.WYs!
else o1zc`Ibd
return nextIndex; K*
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} 6g akopZO
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publicint getPreviousIndex(){ t47 f$gq
int previousIndex = getStartIndex() - uT]_pKm
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pageSize; a;*&q/{o
if(previousIndex < 0) #:' P3)&
return0; %PlPXoG=
else -Rjn<bTIy
return previousIndex; ~ D3'-,n[
} aM? 7'8/
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} J_rCo4}
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抽象业务类 IA8kq =W
java代码: .s7/bF
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/** .fo.mC@a
* Created on 2005-7-12 Bu!Gy8\
*/ CoJaVLl
package com.javaeye.common.business; |r0j>F
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import java.io.Serializable; u#J5M
import java.util.List; *WMcE$w/D
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import org.hibernate.Criteria; pk;bx2CP8
import org.hibernate.HibernateException; 0"
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import org.hibernate.Session; J=4S\0Z*
import org.hibernate.criterion.DetachedCriteria; V3@^bc!
import org.hibernate.criterion.Projections; [>"qOFCr#:
import #B+2qD>E
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org.springframework.orm.hibernate3.HibernateCallback; I
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import zac>tXU;
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org.springframework.orm.hibernate3.support.HibernateDaoS Pq7YJ"Z?:
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upport; @ULr)&9
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import com.javaeye.common.util.PaginationSupport; CUxSmN2[
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public abstract class AbstractManager extends ;PS[VdV
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HibernateDaoSupport { .6vQWt7@
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privateboolean cacheQueries = false; BIcE3}dS8
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privateString queryCacheRegion; 0JNG\ARC
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publicvoid setCacheQueries(boolean L]HY*e
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cacheQueries){ ^{~y+1lt'
this.cacheQueries = cacheQueries; II~D66 bF
} sF|<m)Kt{W
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publicvoid setQueryCacheRegion(String ]4z?sk@
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queryCacheRegion){ O^:Rm=,$
this.queryCacheRegion = d(To)ly.
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queryCacheRegion; K bwWrf>
} $fnFi|-
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publicvoid save(finalObject entity){ M6 0(yTm
getHibernateTemplate().save(entity); kv(N/G
} /1MO]u\
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publicvoid persist(finalObject entity){ 7qzI]
getHibernateTemplate().save(entity); fep#Kb%"e
} U8<GD|
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publicvoid update(finalObject entity){ ~"=nt@M]
getHibernateTemplate().update(entity); AeUwih.
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} FirmzB Il5
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publicvoid delete(finalObject entity){ 2!" N9Adt
getHibernateTemplate().delete(entity); '>`bp25>
} AV&W&$
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publicObject load(finalClass entity, Ah)7A|0rT
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finalSerializable id){ F*I{?NRN1
return getHibernateTemplate().load ~9'VP}\
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(entity, id); B~~rLo:a
} oPWvZI(\&
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publicObject get(finalClass entity, }B0V$
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finalSerializable id){ Wb*d`hzQ}
return getHibernateTemplate().get fMLm_5 (H
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(entity, id); {kZhje^$vi
} =VY[m-q5
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publicList findAll(finalClass entity){ OkFq>;{a
return getHibernateTemplate().find("from pV>/"K
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" + entity.getName()); < ^J!*>
} vx-u+/\
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publicList findByNamedQuery(finalString JLg_oK6
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namedQuery){ tk,
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return getHibernateTemplate =<33(
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().findByNamedQuery(namedQuery); RHB>svT^K>
} L2K4nTA
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publicList findByNamedQuery(finalString query, yil{RfBEr_
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finalObject parameter){ GbNVcP.ocP
return getHibernateTemplate y< 146
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().findByNamedQuery(query, parameter); Vr5a:u'
} D;:lw]
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publicList findByNamedQuery(finalString query, !})+WSs'"s
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finalObject[] parameters){ >#>YoA@S
return getHibernateTemplate wmT3 >
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().findByNamedQuery(query, parameters);
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} KE(kR>OB]
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publicList find(finalString query){ B`KpaE]
return getHibernateTemplate().find 8qBw;A)
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(query); AY *
} Z/ThYbk
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publicList find(finalString query, finalObject kuUH2:L
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parameter){ )ns;S
return getHibernateTemplate().find o.j;dsZ
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(query, parameter); 1hRC
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} Kk??}
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public PaginationSupport findPageByCriteria &=s{ +0
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(final DetachedCriteria detachedCriteria){ T mUn/
return findPageByCriteria s]=kD
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); o]k[l;
} -4HI9Czts
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public PaginationSupport findPageByCriteria cLB"<mG
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(final DetachedCriteria detachedCriteria, finalint Ya,>E@oc
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startIndex){ %7L'2/Y2x
return findPageByCriteria
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(detachedCriteria, PaginationSupport.PAGESIZE, $Y ]*v)}X
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startIndex); w#"c5w~
} az19-QIcg
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public PaginationSupport findPageByCriteria 9$Hgh7'hvs
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(final DetachedCriteria detachedCriteria, finalint ^TB%| yZ _
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pageSize, 4\-kzGgmo
finalint startIndex){ `%rqQnVB
return(PaginationSupport) a:P%
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getHibernateTemplate().execute(new HibernateCallback(){ \WZ00Y,*
publicObject doInHibernate Be}Cj(C
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(Session session)throws HibernateException { f)gA.Rz
Criteria criteria = sy]1Ba%
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detachedCriteria.getExecutableCriteria(session); )|2g#hH5
int totalCount = 7$b78wax
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((Integer) criteria.setProjection(Projections.rowCount 9fe~Q%x=u
2"%d!"
()).uniqueResult()).intValue(); !q$IB?8
criteria.setProjection znu?x|mV
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(null); }.e*=/"MB
List items = ?2.<y_1
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criteria.setFirstResult(startIndex).setMaxResults Na[bCt
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(pageSize).list(); sd#a_
PaginationSupport ps = *UEo&B2+
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new PaginationSupport(items, totalCount, pageSize, :a`l_RMU
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startIndex); _D
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return ps; q?\3m3GM
} y'Wz*}8pr
}, true); /A{znE
} !o>/gI`
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public List findAllByCriteria(final ;:'A{&0N
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DetachedCriteria detachedCriteria){ 5w{_WR6,
return(List) getHibernateTemplate ]k >S0
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().execute(new HibernateCallback(){ 9g "?`_
publicObject doInHibernate _.\p^ HM
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(Session session)throws HibernateException { Riu0;U( \
Criteria criteria = GndF!#?N(
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detachedCriteria.getExecutableCriteria(session); &{l?j>|TM
return criteria.list(); (}c}=V
} `ZNzDr
}, true); M-0BQs`N
} v')T^b
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public int getCountByCriteria(final o- GHAQ
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DetachedCriteria detachedCriteria){ /|hKZTZJdN
Integer count = (Integer) _H@S(!
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getHibernateTemplate().execute(new HibernateCallback(){ "EhA _ =i
publicObject doInHibernate 6XB9]it6
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(Session session)throws HibernateException { Pm
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Criteria criteria = rN_\tulOF
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detachedCriteria.getExecutableCriteria(session); C\
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return 3kQky
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criteria.setProjection(Projections.rowCount Z>M0[DJ_
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()).uniqueResult(); F8/4PB8-
} Q>= :$I
}, true); M0n@?S
return count.intValue(); 265df
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} m!w(Q+*j
} JAc-5e4
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用户在web层构造查询条件detachedCriteria,和可选的 dN;C-XF3s
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 WVp14Z?k
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PaginationSupport的实例ps。 Bo)w#X
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ps.getItems()得到已分页好的结果集 ,in`JM<o
ps.getIndexes()得到分页索引的数组 zTm&m#){3A
ps.getTotalCount()得到总结果数 ocGqXDg3
ps.getStartIndex()当前分页索引 I`zn#U'
ps.getNextIndex()下一页索引 q9F(8-J
ps.getPreviousIndex()上一页索引 exZa:9 sp
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 qeHb0G
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 PzNk: O
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一下代码重构了。 k G4v>
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我把原本我的做法也提供出来供大家讨论吧: EL5gMs
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首先,为了实现分页查询,我封装了一个Page类: `a98+x?JF
java代码: d1vC-n
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/*Created on 2005-4-14*/ |^8l8u
package org.flyware.util.page; #4DEb<D
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/** o-yZ$+V
* @author Joa #-Ehg4W
* z3[
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*/ S:+SZq
publicclass Page { Nu<M~/
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/** imply if the page has previous page */ \l"1Io=
privateboolean hasPrePage; O#sDZ.EL
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/** imply if the page has next page */ Uf1i"VY
privateboolean hasNextPage; T:q!>"5
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/** the number of every page */ dpx P
privateint everyPage; #kR8v[Z
{D={>0
/** the total page number */ iqRk\yq<
privateint totalPage; B>AmH%f/
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-
/** the number of current page */ &-dyg+b3
privateint currentPage; <]2X~+v
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/** the begin index of the records by the current {U=Mfo?AH
)! Jo7SR
query */ yM`J+tq
privateint beginIndex; ]4^9Tw6
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/** The default constructor */ lZCTthr\
public Page(){ ABuK`(f.
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} *UJ.cQ}
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/** construct the page by everyPage :D|"hJ
* @param everyPage AqM}@2#%%
* */ }1kT0*'L
public Page(int everyPage){ VEj-%"\
this.everyPage = everyPage; b1>zGC^|
} P|`pJYe
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/** The whole constructor */ C @3a/<6m
public Page(boolean hasPrePage, boolean hasNextPage, _r@
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int everyPage, int totalPage, ve|ig]$5g<
int currentPage, int beginIndex){ `!V=~"ve
this.hasPrePage = hasPrePage; J$Uj@M
this.hasNextPage = hasNextPage; mwU|Hh)N]
this.everyPage = everyPage; !6{; z/Hy
this.totalPage = totalPage; 5 YjqN
this.currentPage = currentPage; o/??w:'
this.beginIndex = beginIndex; t@m!k+0
} OMgFp |^
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/** r{R879
* @return n] {sBI3
* Returns the beginIndex. sl?> X)}
*/ b9`vYnLk
publicint getBeginIndex(){ v/gxQy+l
return beginIndex; eLPWoQXt
} wl2P^Pj
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/** }ADdKK-
* @param beginIndex
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* The beginIndex to set. 36iDiT_
*/ >d2U=Yk!
publicvoid setBeginIndex(int beginIndex){ .{r 0Szm.
this.beginIndex = beginIndex; }^3CG9%
} X0G6Wp
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/** \zOo[/-<
* @return ~gZ"8frl
* Returns the currentPage. K{DsGf,
*/ Cb:}AQ =
publicint getCurrentPage(){ 'y_<O |-
return currentPage; s9^r[l@W0U
} Ix~_.&
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/** 9vX~gh{]~
* @param currentPage $D&N^}alW
* The currentPage to set. F%|F-6
*/ XM?>#^nC?u
publicvoid setCurrentPage(int currentPage){ P?WS=w*O0
this.currentPage = currentPage; .t53+<A
} -(~OzRfYi
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/** dZMf5=tb
* @return 3(&f!<Uy
* Returns the everyPage. <cig^B{nX
*/ _TLB1T^/4
publicint getEveryPage(){ ArK%?*`5
return everyPage; KNvvYwFH]
} 0i|z$QRL~
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/** WK$d<:"
* @param everyPage ZRCm'p3
* The everyPage to set. >`{B
*/ 4 q-/R
publicvoid setEveryPage(int everyPage){ yzI`&?
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this.everyPage = everyPage; bn*SLWWQ.3
} d-%bRGo/
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/** zvEofK
* @return STln_'DF'
* Returns the hasNextPage. n VNz5B
*/ ."X}A
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publicboolean getHasNextPage(){ }X|*+<
return hasNextPage; t,P_&0X
} mc
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/** E^K<b7
* @param hasNextPage \mo NpKf
* The hasNextPage to set. IJ[r!&PY
*/ *Rx&