Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 x*Y@Q?`>5W
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Gqy,u3lE
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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 N+y&,N,
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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 gR}35:$Z-
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分页支持类: =%>oR
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java代码: (bh95X
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package com.javaeye.common.util; npNB{J[
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import java.util.List; as>L[jyG/
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publicclass PaginationSupport { *Otg*,\
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publicfinalstaticint PAGESIZE = 30; -P]sRl3O;
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privateint pageSize = PAGESIZE; [Ts"OPb%~
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privateList items; I*`* Q$
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privateint totalCount; dH^ <t,v
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privateint[] indexes = newint[0]; ~fo6*g:f1
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privateint startIndex = 0; b@2J]Ay E*
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public PaginationSupport(List items, int Vb'7>
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totalCount){ U_{Ux2
setPageSize(PAGESIZE); <!pvqNApg
setTotalCount(totalCount); <bD>m[8,
setItems(items); EVNY*&p
setStartIndex(0); L^{|uP15N
} PtTH PAKj
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public PaginationSupport(List items, int D2,z)O%VK
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totalCount, int startIndex){ [u._q:A
setPageSize(PAGESIZE); u@4V7;L
setTotalCount(totalCount); P(K>=O
setItems(items); MXyaE~LK
setStartIndex(startIndex); hsw9(D>jp
} e A}%C.ZR
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public PaginationSupport(List items, int d`/tE?Gw
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totalCount, int pageSize, int startIndex){ p}<w#p
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setPageSize(pageSize); d%0~c'D8a
setTotalCount(totalCount); nO)X!dp}J
setItems(items); ~D |5u\D-
setStartIndex(startIndex); "kA*Vc#
} m-jHze`D3
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publicList getItems(){ D91e\|]
return items; 3q?\r`
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} T]?n)L,2
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publicvoid setItems(List items){ 9Fr3pRIJ
this.items = items; -> J_ ~
} 6AWKLFMV
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publicint getPageSize(){ DSj(]U~r
return pageSize; UYz0PSV=.
} 8dlw-Q'S
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publicvoid setPageSize(int pageSize){ RAp=s
this.pageSize = pageSize; /P
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} "t0kAG
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publicint getTotalCount(){ ~M(5Ho
return totalCount; 2"-S<zM
} XJIv1s\g
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publicvoid setTotalCount(int totalCount){ ]K*8O<
if(totalCount > 0){ sQ8s7l0D
this.totalCount = totalCount; 7K{Nb
int count = totalCount / 84{Q\c
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pageSize; ZlojbL@|4
if(totalCount % pageSize > 0) 8L1oh j
count++; s<]&*e&}?
indexes = newint[count]; Q*XE
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for(int i = 0; i < count; i++){ ${8?N:>t
indexes = pageSize * 4Ua>Yw0
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} [JaS??ig
}else{ wlPx,UqZ
this.totalCount = 0; @p|$/Z%R,
} F]I=+T
} $.:mai
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publicint[] getIndexes(){ X.TI>90{
return indexes; nJbbzQ,e
} (S ^8UV
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publicvoid setIndexes(int[] indexes){ )}L??|#
this.indexes = indexes; BJS-Jy$-
} ~j'l.gQb
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publicint getStartIndex(){ 9TAj) {U%'
return startIndex; Mzd[fR5a8
}
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publicvoid setStartIndex(int startIndex){ BQ jK8c<
if(totalCount <= 0) 1R.4:Dn_
this.startIndex = 0; j.:h5Y^N
elseif(startIndex >= totalCount)
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this.startIndex = indexes D\ H/
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[indexes.length - 1]; AE@NOM7u
elseif(startIndex < 0) Urgtg37
this.startIndex = 0; TH &qX
else{ ++Ww88820
this.startIndex = indexes e2-Dq]p
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[startIndex / pageSize]; }Up.){.%
} DKmZ
} mw^7oO#
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publicint getNextIndex(){ dC1V-x10ju
int nextIndex = getStartIndex() + bOI3^T
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pageSize; c
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if(nextIndex >= totalCount) 4"=Vq5
return getStartIndex(); _3Cn{{ A0
else U,Mx@KdV
return nextIndex; D?M!ra
} xE-7P|2
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publicint getPreviousIndex(){ \VSATL:]
int previousIndex = getStartIndex() - >b.^kc
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pageSize; j!z-)p8hy
if(previousIndex < 0) C_LvZ=
return0; aJqeD'\>
else !rhk
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return previousIndex; eb|i3.
} $c&0F,
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} yA[({2%
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抽象业务类 [/RM=4Nh5
java代码: !q"CV
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/** [hRU&z;W
* Created on 2005-7-12 :!zC"d9@
*/ V,ZY*f0
package com.javaeye.common.business; m?[5J)eR
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import java.io.Serializable; #2xSyOrmf
import java.util.List; 4F MAz^
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import org.hibernate.Criteria; W0cgI9=9
import org.hibernate.HibernateException; %}>dqUyQ
import org.hibernate.Session; o5aLUWi-
import org.hibernate.criterion.DetachedCriteria; c3
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import org.hibernate.criterion.Projections; ;pRcVL_4
import T{vR,
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org.springframework.orm.hibernate3.HibernateCallback; cyd~2\Kv~
import =GR'V
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org.springframework.orm.hibernate3.support.HibernateDaoS iz]rFNR
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upport; !Ngw\@f
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import com.javaeye.common.util.PaginationSupport; dv
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public abstract class AbstractManager extends ?PPZp6A3L=
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HibernateDaoSupport { yy(A(}
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privateboolean cacheQueries = false; F#+ .>!
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privateString queryCacheRegion; HT`1E0G8)
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publicvoid setCacheQueries(boolean >E"9*:.^a
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cacheQueries){ rU#li0
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this.cacheQueries = cacheQueries; PQj<[rY
} ]y1fM0
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publicvoid setQueryCacheRegion(String Q* O<@
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queryCacheRegion){ O%1/r*
this.queryCacheRegion = q'(z #h,cv
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queryCacheRegion; FE m=w2
} =7ydk"xM*
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publicvoid save(finalObject entity){ hRTMFgO
getHibernateTemplate().save(entity); yFpySvj}
} q^bO*bv
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publicvoid persist(finalObject entity){ F;D1F+S
getHibernateTemplate().save(entity); mrZ`Lm#>pS
} ,-rB=|w
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publicvoid update(finalObject entity){ AZZRa69=
getHibernateTemplate().update(entity); MC=G "m:_
} Rf[V)x
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publicvoid delete(finalObject entity){ U=!@Db5k~
getHibernateTemplate().delete(entity); &2.+Igo|G
} _ 6:ww/
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publicObject load(finalClass entity, d(L{!mm
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finalSerializable id){ d#T?Q_3b
return getHibernateTemplate().load [BXyi
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(entity, id); )mkS5j`5\
} MD'>jO;n
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publicObject get(finalClass entity, |f NMs
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finalSerializable id){ =,Ttw>
return getHibernateTemplate().get -i_En^Fi
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(entity, id); %2yAvGa1
} NfF~dK|
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publicList findAll(finalClass entity){ d=e{]MG(
return getHibernateTemplate().find("from &`@M8-m#F
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" + entity.getName()); eF1.VLI
} 3Xdn62[&
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publicList findByNamedQuery(finalString ex phe+b
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namedQuery){ }aZrou3E
return getHibernateTemplate sb'p-Mj
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().findByNamedQuery(namedQuery); "=A|K~b
} B| Q6!
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publicList findByNamedQuery(finalString query, ~t9Mh^gij
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finalObject parameter){ 4 =Fg!Eu<
return getHibernateTemplate 37KU~9-A
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().findByNamedQuery(query, parameter); ; J2-rh
} $-w5o`e
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publicList findByNamedQuery(finalString query, ve%l({
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finalObject[] parameters){ 46dc.Yi
return getHibernateTemplate dzxI QlP
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().findByNamedQuery(query, parameters); h[H%:743
} Ej|A
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publicList find(finalString query){ 1NGyaI
return getHibernateTemplate().find ~'[jBn)
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(query); Dqr9Vv
} 6UI>GQ
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publicList find(finalString query, finalObject bm6hZA|
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parameter){ YZ*{^'
return getHibernateTemplate().find qvTJ>FILT
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(query, parameter); O0zi@2m?B
} VIYV92[
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public PaginationSupport findPageByCriteria >p |yf.G
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(final DetachedCriteria detachedCriteria){ 2H>aC
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return findPageByCriteria H%~Q?4
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 2+&R"#I
} r./z,4A`
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public PaginationSupport findPageByCriteria '^B3pR:
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(final DetachedCriteria detachedCriteria, finalint zP|*(*
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startIndex){ {]@Qu" M
return findPageByCriteria -3`Isv
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(detachedCriteria, PaginationSupport.PAGESIZE, ^Yr|K
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startIndex); {DS\!0T-X
} dh?S[|='
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public PaginationSupport findPageByCriteria 776 nWw)
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(final DetachedCriteria detachedCriteria, finalint PAr|1i)mB
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pageSize, RSFJu\0}N
finalint startIndex){ jDJ.
return(PaginationSupport) Hz5;Ruw'
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getHibernateTemplate().execute(new HibernateCallback(){ Kv1vx*>
publicObject doInHibernate <]c#)xg
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(Session session)throws HibernateException { .&L^J&V
Criteria criteria = ^^'[%ok
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detachedCriteria.getExecutableCriteria(session); -P*xyI
int totalCount = ,NDxFy;d
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((Integer) criteria.setProjection(Projections.rowCount j]#wrm
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()).uniqueResult()).intValue(); $Llvp bl
criteria.setProjection wYa0hNd
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(null); GtG&yeB
List items = :(+]b
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criteria.setFirstResult(startIndex).setMaxResults ]|;7R^o3|
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(pageSize).list(); o\:$V
PaginationSupport ps = FE>3 D1\
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new PaginationSupport(items, totalCount, pageSize, _>;&-e
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startIndex); Mo~ki"9.
return ps; v^;-@ddr
} 7<fL[2-
}, true); mQFa/7FX
} :mzCeX8 *
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public List findAllByCriteria(final hzW{_Q.|?
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DetachedCriteria detachedCriteria){ j,Pwket
return(List) getHibernateTemplate m\1VF\
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().execute(new HibernateCallback(){ !+5C{Hs2
publicObject doInHibernate 4Fh&V{`W
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(Session session)throws HibernateException { tx gvVQ
Criteria criteria = NYGmLbq
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detachedCriteria.getExecutableCriteria(session); r+SEw ;
return criteria.list(); $+0=GN
} lGl[^
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}, true); S_ZLTcq<1
} Al=(sHc'
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public int getCountByCriteria(final _r~!O$2
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DetachedCriteria detachedCriteria){
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Integer count = (Integer) 4c
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getHibernateTemplate().execute(new HibernateCallback(){ |X,$?ZDap
publicObject doInHibernate 4t,zHR6W
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(Session session)throws HibernateException { IkiQOk
Criteria criteria = !T)T_P[
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detachedCriteria.getExecutableCriteria(session); u,:CJ[3
return j
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criteria.setProjection(Projections.rowCount mx:J>SPA8
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()).uniqueResult(); 0Z@ARMCe|m
} E"G:K`Q
}, true); Y]hV-_2+Do
return count.intValue(); bl$+8!~
} N[#iT&@T}/
} pk;ff q@
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用户在web层构造查询条件detachedCriteria,和可选的 14mXx}O
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 oNiToFbQu
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PaginationSupport的实例ps。 JmnBq<&,0
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ps.getItems()得到已分页好的结果集 -q'xC: m
ps.getIndexes()得到分页索引的数组 x:!C(Ep)
ps.getTotalCount()得到总结果数 SPfD2%jjC
ps.getStartIndex()当前分页索引 sI^@A=.@
ps.getNextIndex()下一页索引 $, 8 CH)w
ps.getPreviousIndex()上一页索引 Y1#-^,qg
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 @SKO~?7T
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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 sN6 0o 7.
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一下代码重构了。 8#X?k/mzU
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我把原本我的做法也提供出来供大家讨论吧: _F}IF9{?G
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首先,为了实现分页查询,我封装了一个Page类: [
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java代码: H.jLGe>
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/*Created on 2005-4-14*/ 2neF<H?^o
package org.flyware.util.page; >P<k[vF
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/** 7xLo4
* @author Joa }9L 40)8
* w/lXZg
*/ C ffTv
publicclass Page { UgF) J
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/** imply if the page has previous page */ o|rGy5
privateboolean hasPrePage; GVjv**U
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/** imply if the page has next page */ d[s;a.
privateboolean hasNextPage; 9f@#SB_H
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/** the number of every page */ kGB#2J
privateint everyPage; ()+jrrK
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/** the total page number */ hN>('S-cq
privateint totalPage; ^BF@j4*~
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/** the number of current page */ t-v^-#
privateint currentPage; 9s;!iDFn
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/** the begin index of the records by the current #U?EOm
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