Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 _<FUS'"
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 qar{*>LCG
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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 (C#0
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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 h!%y,4IBR
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分页支持类: Cj-&L<
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java代码: )Bn
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package com.javaeye.common.util; GZu12\0nZ
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import java.util.List; 7;AK=;
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publicclass PaginationSupport { cMZy~>
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publicfinalstaticint PAGESIZE = 30; zHZfp_I
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privateint pageSize = PAGESIZE; te-xhJ&K
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privateList items; cYK:Y!|`F
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privateint totalCount; ajk}&`Wj"
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privateint[] indexes = newint[0]; ;!S5P(
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privateint startIndex = 0; &lSNI5l
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public PaginationSupport(List items, int 0H>gMXWE]
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totalCount){ ,zM@)Q;9
setPageSize(PAGESIZE); oio{@#DX`
setTotalCount(totalCount); %AA&n*m
setItems(items); SgewAng?@o
setStartIndex(0); HL4=P,'
} SkmTW@v
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public PaginationSupport(List items, int d=^QK{8
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totalCount, int startIndex){ _-y1>{]H
setPageSize(PAGESIZE); XN Uw
setTotalCount(totalCount); 7yyX8p>
setItems(items); uxD3+Q
setStartIndex(startIndex); 2sIt~ Gn
} aq_K,li#w
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public PaginationSupport(List items, int _J6
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totalCount, int pageSize, int startIndex){ _LwF:19Il
setPageSize(pageSize); <A Hzs
setTotalCount(totalCount); 2kVZlt'y
setItems(items); d%0Gsga}
setStartIndex(startIndex); g@!U^mr*3
} cdL]s^z
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publicList getItems(){ b-VtQ%Q
return items; 85G-`T
} C\5G43`
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publicvoid setItems(List items){ ph5{i2U0
this.items = items; yYJ_;Va
} S=)
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publicint getPageSize(){ tlp,HxlP
return pageSize; Rmmu#-{Y
} i \NV<I
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publicvoid setPageSize(int pageSize){ j8Z;}Ps
this.pageSize = pageSize; gQ0,KYmI3_
}
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publicint getTotalCount(){ Sk+XBX(}
return totalCount; \B~g5}=
} _:Xmq&<W
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publicvoid setTotalCount(int totalCount){ F|>
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if(totalCount > 0){ $Okmurnn
this.totalCount = totalCount; x @q.u3o9
int count = totalCount / %:`v.AG
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pageSize; kE<CuO
if(totalCount % pageSize > 0) %r1#G.2YW
count++; ~wuCa!!A
indexes = newint[count]; td7(444]
for(int i = 0; i < count; i++){ @ywtL8"1~
indexes = pageSize * /gF)msUF
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} fB9,#
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}else{ 13F]7l-#
this.totalCount = 0; VnW6$W?g
} k"cMAu.
} `ZEFH7P
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publicint[] getIndexes(){ 8d5#vm
return indexes; +
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} B1|nT?}J(
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publicvoid setIndexes(int[] indexes){ kbb!2`F!%
this.indexes = indexes; [ K/l;Zd
} -y!Dg6A
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publicint getStartIndex(){ QxW+|Gt._
return startIndex; GYQ:G=
} {2:baoG-
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publicvoid setStartIndex(int startIndex){ ?P[:,0_
if(totalCount <= 0) /~'C!so[v
this.startIndex = 0; Hb*Z_s
elseif(startIndex >= totalCount) heIys.p
this.startIndex = indexes C2rG3X^~Jm
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[indexes.length - 1]; d)uuA;n
elseif(startIndex < 0) f3!Oc
this.startIndex = 0; ib(|}7Je
else{ gWU#NRRc
this.startIndex = indexes YG0/e#5
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[startIndex / pageSize]; c`3`}&g#
} UNb7WN
} $rj:K)P
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publicint getNextIndex(){ :|5 m"X\
int nextIndex = getStartIndex() + .CEC
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pageSize; cG0)F%?X?
if(nextIndex >= totalCount) a K6dy\
return getStartIndex(); ]p+KN>1e
else Y~*p27@fR
return nextIndex; 3"Oipt+
} AoGpM,W]5
}*!L~B!
publicint getPreviousIndex(){ KF
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int previousIndex = getStartIndex() - U*K4qJ6U
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pageSize; 2d|^$$#`
if(previousIndex < 0) :1f,%Z$,q
return0; `_LQs9J0J
else @dK_w'W
return previousIndex; z<t2yh(DF
} %6fnL~A
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} ZJbaioc\
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抽象业务类 $ H@
java代码: n>JJ Xw,,
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/** L=#B>Eu
* Created on 2005-7-12 ~,s'-
*/ tAjT-CXg
package com.javaeye.common.business; *cFGDQ!
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import java.io.Serializable; u7J:ipyiq2
import java.util.List; .3+8Ip#z
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import org.hibernate.Criteria; A-vYy1,'
import org.hibernate.HibernateException; ]c_lNHssmq
import org.hibernate.Session; W1o6Sh8v(
import org.hibernate.criterion.DetachedCriteria; #r>)A
import org.hibernate.criterion.Projections; (`Y;U(n
import +{6:]
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org.springframework.orm.hibernate3.HibernateCallback; ~<IQe-Q5
import 1F0];{a
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org.springframework.orm.hibernate3.support.HibernateDaoS -
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upport; MftaT5
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import com.javaeye.common.util.PaginationSupport; =dKk #*
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public abstract class AbstractManager extends t,w/L*r+w
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HibernateDaoSupport { F-~Xbz%
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privateboolean cacheQueries = false; XkW@"pf&Fh
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privateString queryCacheRegion; [r]<~$
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publicvoid setCacheQueries(boolean ~h +B&F+5
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cacheQueries){ H-WNu+
this.cacheQueries = cacheQueries; .Xxxz
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} uuUjIZCtz
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publicvoid setQueryCacheRegion(String 9)b{U2&
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queryCacheRegion){ E>QEI;
this.queryCacheRegion = 8z&/{:Z@pH
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queryCacheRegion; Xn!=/<TIVz
} Ex}TDmTu
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publicvoid save(finalObject entity){ (d
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getHibernateTemplate().save(entity); f|!@H><
} tJGPkeA
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publicvoid persist(finalObject entity){ O1]XoUH<
getHibernateTemplate().save(entity); 1Ji"z>H*
} cwUor}<|
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publicvoid update(finalObject entity){ 7vH4}S\
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getHibernateTemplate().update(entity); Y(R],9h8
} ?GZ?HK|
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publicvoid delete(finalObject entity){ @zix%x
getHibernateTemplate().delete(entity); H/G;hk
} xJvalb
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publicObject load(finalClass entity, R?*-ZI[>w
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finalSerializable id){ t6+>Zr
return getHibernateTemplate().load LGCeYXic
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(entity, id); 5_L43-
} r2Q) Q
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publicObject get(finalClass entity, 1Imb"E
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finalSerializable id){ 6tM@I`l
return getHibernateTemplate().get Au?(_*/0
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(entity, id); *\wf(o>Q
} Qc:Sf46O
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publicList findAll(finalClass entity){
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return getHibernateTemplate().find("from l_=kW!l
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" + entity.getName()); ^m^,:]I0P
} M Xl!
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publicList findByNamedQuery(finalString $%J$
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namedQuery){ SB!m&;Tb
return getHibernateTemplate L2y{\<JC"
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().findByNamedQuery(namedQuery); -RH ?FJ
} @3S2Xb{ra1
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publicList findByNamedQuery(finalString query, L6A6|+H%E
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finalObject parameter){ !P92e1
return getHibernateTemplate l2`8]Qr
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().findByNamedQuery(query, parameter); d=4MqX r
} "msg./iC
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publicList findByNamedQuery(finalString query, *,-YWx4
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finalObject[] parameters){ _1R`xbV
return getHibernateTemplate t583Q/1@
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().findByNamedQuery(query, parameters); *,n7&
} mifYk>J^9
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publicList find(finalString query){ (wY%$kW4
return getHibernateTemplate().find i~F Ct4
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(query); bL[PNUG
} Z.mV fy%
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publicList find(finalString query, finalObject ~!nd'{{9
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parameter){ J/=A f
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return getHibernateTemplate().find P`%ppkzV6
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(query, parameter); RU>vnDaC
} q,(&2./
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public PaginationSupport findPageByCriteria N7jRdT2k%
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(final DetachedCriteria detachedCriteria){ `i:0dVs
return findPageByCriteria '_&(Iwu
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); uHIWbF<0oo
} &Egn`QU
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public PaginationSupport findPageByCriteria g`6wj|@ =W
% b&BLXW
(final DetachedCriteria detachedCriteria, finalint SWGa%6|
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startIndex){ jlP7'xt1%
return findPageByCriteria }2.}fHb2
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(detachedCriteria, PaginationSupport.PAGESIZE, =iQm_g
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startIndex); .0-m=3mp2
} yk)j;i4@
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public PaginationSupport findPageByCriteria !491
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(final DetachedCriteria detachedCriteria, finalint vWovR`
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pageSize, -]A#G`'
finalint startIndex){ |K-lgrA
return(PaginationSupport) "3MUrIsB>
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getHibernateTemplate().execute(new HibernateCallback(){ =4
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publicObject doInHibernate QX=;,tr
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(Session session)throws HibernateException { M\6`2q
Criteria criteria = L#
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detachedCriteria.getExecutableCriteria(session); $?-o
int totalCount = FxX3Pq8h
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((Integer) criteria.setProjection(Projections.rowCount EI.Pk>ZIm
@<=#i
()).uniqueResult()).intValue(); F s\P/YX
criteria.setProjection hF7mJ\
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(null); jFTV\|C
List items = ?|J+dW
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criteria.setFirstResult(startIndex).setMaxResults BQ:Kx _
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(pageSize).list(); 7 aD&\?
PaginationSupport ps = 3F} KrG
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new PaginationSupport(items, totalCount, pageSize, m =,c,*>
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startIndex); 08?MS_
return ps; g
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} }a1Sfl@`3
}, true); G?d,$NMo|
} dKQV4dc>
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public List findAllByCriteria(final &E
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DetachedCriteria detachedCriteria){ ]</4#?_
return(List) getHibernateTemplate 7jH`_58
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().execute(new HibernateCallback(){ ^r_lj$:+$
publicObject doInHibernate NVqC|uEAF
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(Session session)throws HibernateException { /+t[,
Criteria criteria = LsQ8sFP_"
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detachedCriteria.getExecutableCriteria(session); ^+Vk#_2Q
return criteria.list(); &f<1=2dm
} X/8iJ-KB
}, true); t<k[W'#
} 1 j^c
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public int getCountByCriteria(final
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DetachedCriteria detachedCriteria){ )uid!d
Integer count = (Integer) c\MsVH2|
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getHibernateTemplate().execute(new HibernateCallback(){ \}x'>6zr2
publicObject doInHibernate yb4tJu$
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(Session session)throws HibernateException { f3TlJ!!U
Criteria criteria = ,#bb8+z&p
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detachedCriteria.getExecutableCriteria(session); uB<F.!3
return i,IM?+4
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criteria.setProjection(Projections.rowCount TA0D{
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()).uniqueResult(); <P^hYj-swh
} 80$0zbw$
}, true); .^LL9{?
return count.intValue(); &oeN#5Es8C
} 9vp%6[
} D!RE-w92X
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用户在web层构造查询条件detachedCriteria,和可选的 3@yTzaq6
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ]<q}WjXD'
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PaginationSupport的实例ps。 "X5_-l
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ps.getItems()得到已分页好的结果集 %'"HGZn b
ps.getIndexes()得到分页索引的数组 -MrtliepW*
ps.getTotalCount()得到总结果数 Ns2,hQFc
ps.getStartIndex()当前分页索引 9k\)tWe
ps.getNextIndex()下一页索引 *qPdZ
ps.getPreviousIndex()上一页索引 `V&1]C8x
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 <)O>MI'
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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 s.y q}Q
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一下代码重构了。 sno`=+|U]
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我把原本我的做法也提供出来供大家讨论吧: SyK 9Is{8
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首先,为了实现分页查询,我封装了一个Page类: e}42/>}#D
java代码: KVB0IXZC~
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/*Created on 2005-4-14*/ 7\A4vUI3
package org.flyware.util.page; mn]-rTr
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/** A4G,}r *n
* @author Joa ^rv"o:lF
* RU2c*q$^X
*/ Jyj0Gco
publicclass Page { QsiJ%O Q
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/** imply if the page has previous page */ ao#!7F
privateboolean hasPrePage; t5.`!3EO
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/** imply if the page has next page */ VFv9Q2/.
privateboolean hasNextPage; CqqXVF3
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/** the number of every page */ "EoDQT"0
privateint everyPage; 0$6*o}N%
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/** the total page number */ )QmGsU}?
privateint totalPage; ^[k0k(_
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/** the number of current page */ 9tn;L"#&N
privateint currentPage; >$\Bu]{1
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