Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 iKP\/LR<n
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 3 C E 39W
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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 l4R<`b\Jt
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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 'fp<FeTg
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分页支持类: ')Dp%"\?
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java代码: i-K"9z|)
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package com.javaeye.common.util; RE(=! 8lGR
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import java.util.List; qr<-eJf
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publicclass PaginationSupport { Y ;~~?[6
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publicfinalstaticint PAGESIZE = 30; {GG~E54&B
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privateint pageSize = PAGESIZE; i_jax)m%
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privateList items; /:
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privateint totalCount; 5;sQ@
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privateint[] indexes = newint[0]; ~_# Y,)S!z
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privateint startIndex = 0; e!2%k u
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public PaginationSupport(List items, int @FnI?Rx
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totalCount){ 9$\;voo
setPageSize(PAGESIZE); JPoK\-9NT
setTotalCount(totalCount); 6iV"Tl{z-
setItems(items); P(YG@
setStartIndex(0); #?b^B~ #
} n'&`9M['%d
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public PaginationSupport(List items, int yBD2
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totalCount, int startIndex){ >`rNT|rg
setPageSize(PAGESIZE); GJ^]ER-K
setTotalCount(totalCount); A 4W
setItems(items); yV+ E;
setStartIndex(startIndex); lu@>?,<
} _c(C;s3o
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public PaginationSupport(List items, int *|,ykb>
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totalCount, int pageSize, int startIndex){ 2dd:5L,
setPageSize(pageSize); ;MRC~F=
setTotalCount(totalCount); l
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setItems(items); ^]lwd"$
setStartIndex(startIndex); rM
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}
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publicList getItems(){ !qw=I(
return items; V.gY1
} >2Qqa;nx|
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publicvoid setItems(List items){ o"ah\"#el
this.items = items; ng&EGM
} va/4q+1GfH
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publicint getPageSize(){ <Ec)m69P
return pageSize; }jY[| >z
} ZV q
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publicvoid setPageSize(int pageSize){ ">vYEkZ3
this.pageSize = pageSize; ]-5jgz"
} ^3)2]>pW
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publicint getTotalCount(){ ~h^}W$pO
return totalCount; |Q)w3\S$
} n\"LN3
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publicvoid setTotalCount(int totalCount){ `w=H'"Zv
if(totalCount > 0){ F/od,w9_
this.totalCount = totalCount; eeJt4DV8v
int count = totalCount / 1DlcO>#@
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pageSize; j]l}K*8(
if(totalCount % pageSize > 0) -J7,Nw
count++; HFx"fT
indexes = newint[count]; \y )4`A
for(int i = 0; i < count; i++){ )(!Z90@
indexes = pageSize * )4_6\VaM
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} . nF
}else{ gL}Y5U+s
this.totalCount = 0; pdha"EV
} U9fF;[g
} x(zZqOed
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publicint[] getIndexes(){ PM<LR?PLc
return indexes; -zLI!F 0
} V\`="
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publicvoid setIndexes(int[] indexes){ ^RAFmM#F
this.indexes = indexes; 8Pdnw/W
} O#5( U.E
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publicint getStartIndex(){ Cl.T'A$
return startIndex; ,Y8X"~{A
} N_k6UA9
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publicvoid setStartIndex(int startIndex){ k Q(y^t W
if(totalCount <= 0) yj+b/9My
this.startIndex = 0; }<h.
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elseif(startIndex >= totalCount) 6Oba}`)q9
this.startIndex = indexes 'I>#0VRr
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[indexes.length - 1]; ~tuFjj^
elseif(startIndex < 0) 6:tr8 X_
this.startIndex = 0; v!h-h&p O7
else{ +mOtYfW
this.startIndex = indexes T>%ny\?tHW
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[startIndex / pageSize]; VX[!Vh
} B]F7t4Y!
} *9(1:N;#
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publicint getNextIndex(){ jF_I4H
int nextIndex = getStartIndex() + 5@%-=87S
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pageSize; &*GX:0=/>
if(nextIndex >= totalCount) c!^}!32j)
return getStartIndex(); +##I4vP
else 8vW`E_n
return nextIndex; 2B dr#qr
} yP4.Z9
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publicint getPreviousIndex(){ AV3,4u
int previousIndex = getStartIndex() - r['C.S6
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pageSize; }3y\cv0ct
if(previousIndex < 0) l8Qi^<i/
return0; G@!9)v]9
else ZUW>{'[K
return previousIndex; M)^9e?
} bI(98V,t
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} i]?xM2(N
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抽象业务类 hO@3-SRa,k
java代码: z1s"C[W2T
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/** Fsj[J E
* Created on 2005-7-12 uI&M|u:nT
*/ {hR2NUm
package com.javaeye.common.business; f"^tOgGH
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import java.io.Serializable; ]t;5kj/
import java.util.List; :zRboqe(cc
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import org.hibernate.Criteria; rtE,SN
import org.hibernate.HibernateException; g>zL{[e!
import org.hibernate.Session; P,_E 4y
import org.hibernate.criterion.DetachedCriteria; ),,vu
import org.hibernate.criterion.Projections; -1JHhRr]
import EPy/6-5b
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org.springframework.orm.hibernate3.HibernateCallback; 4/>={4Y9
import }*.*{I
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org.springframework.orm.hibernate3.support.HibernateDaoS UI;{3Bn
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upport; 90}B*3x
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import com.javaeye.common.util.PaginationSupport; j83
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public abstract class AbstractManager extends J]B5w{??b
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HibernateDaoSupport { <bI,y_<K
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privateboolean cacheQueries = false; )K~nZLULY
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privateString queryCacheRegion; Xk'.t|
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publicvoid setCacheQueries(boolean W( YJz#]6_
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cacheQueries){ ez{&Y>n
this.cacheQueries = cacheQueries; kZQ;\QL1}
} 6-"&jbvm
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publicvoid setQueryCacheRegion(String F1>,^qyG6
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queryCacheRegion){ #Gx@\BE{
this.queryCacheRegion = BxF
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queryCacheRegion; qv6]YPP
} UlrY
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publicvoid save(finalObject entity){ G<'S
getHibernateTemplate().save(entity); n:P}K?lg
} qM+T Wp
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publicvoid persist(finalObject entity){ LKa_ofY
getHibernateTemplate().save(entity); ^-ZqS
} Q"O _h
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publicvoid update(finalObject entity){ dkjL;1
getHibernateTemplate().update(entity); (C&f~U
} F/8y p<_r
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publicvoid delete(finalObject entity){ _EP}el
getHibernateTemplate().delete(entity); +\4=G@P.J
} ("Zi,3"+
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publicObject load(finalClass entity, !SnpesTn
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finalSerializable id){ <$E8T>U
return getHibernateTemplate().load Z_%>yqDC
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(entity, id); A!c.P2
} mYCGGwD
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publicObject get(finalClass entity, JmkJ^-A 6
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finalSerializable id){ Uu
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return getHibernateTemplate().get ec|IT0;
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(entity, id); 7 UR)4dYA
} }U9e#>ex
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publicList findAll(finalClass entity){ m9/a!|fBE
return getHibernateTemplate().find("from \C#Vh7z"2&
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" + entity.getName());
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} 1z)+P1nH]
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publicList findByNamedQuery(finalString [X|P(&\hQd
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namedQuery){ ;kY=}=9
return getHibernateTemplate 1!~9%=%
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().findByNamedQuery(namedQuery); + EM '-
} H]cCyuCdH
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publicList findByNamedQuery(finalString query, K~uoZ~_gA
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finalObject parameter){ $lvpBs
return getHibernateTemplate 6uD Nqq
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().findByNamedQuery(query, parameter); ;(z0r_p<q
} o^Ms(?K%t
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publicList findByNamedQuery(finalString query, 'INdZ8j_
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finalObject[] parameters){ VP[ J#TPU
return getHibernateTemplate %#=
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().findByNamedQuery(query, parameters); <=WQs2
} %N 2=: ;f
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publicList find(finalString query){ 9T)-|fja_
return getHibernateTemplate().find ondF
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(query); t'^/}=c-
} QHK$2xtq|
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publicList find(finalString query, finalObject <J\z6+,4E
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parameter){ nT:ZSJWM
return getHibernateTemplate().find WUKYwA/t
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(query, parameter); DvU(rr\p
} @`)A)
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public PaginationSupport findPageByCriteria p;g$D=2
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(final DetachedCriteria detachedCriteria){ Mc9% s$MT
return findPageByCriteria t=5K#SX}
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 0:Xvch0
} ]JbGP{UiN
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public PaginationSupport findPageByCriteria "d9"Md0k
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(final DetachedCriteria detachedCriteria, finalint PE0A `
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startIndex){ VD,g
return findPageByCriteria QYPsqkF*
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(detachedCriteria, PaginationSupport.PAGESIZE, `J#(ffo-
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startIndex); ,!Gw40t
} 4u0=/pfi[
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public PaginationSupport findPageByCriteria Y:XE4v/)@L
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(final DetachedCriteria detachedCriteria, finalint ,E<(K8
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pageSize, CNwIM6t
finalint startIndex){ (
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return(PaginationSupport) R5(<:]
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getHibernateTemplate().execute(new HibernateCallback(){ BagO0#
publicObject doInHibernate cia'h_w
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(Session session)throws HibernateException { Bvb.N$G
Criteria criteria = J'jwRn
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detachedCriteria.getExecutableCriteria(session); F
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int totalCount = |uf{:U)
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((Integer) criteria.setProjection(Projections.rowCount $dIu${lu
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()).uniqueResult()).intValue(); ;/l$&:
criteria.setProjection
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(null); bis}zv^%v
List items = Z<jio
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criteria.setFirstResult(startIndex).setMaxResults ;;;aM:6\
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(pageSize).list(); YW9r'{(D(I
PaginationSupport ps = sxc^n
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new PaginationSupport(items, totalCount, pageSize, 6:_@ ;/03%
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startIndex); ])Rs.Y{Q5
return ps; =Y!x
} zB/#[~
}, true); =)QtE|p,77
} ,6TF]6:
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public List findAllByCriteria(final |W $epOLg
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DetachedCriteria detachedCriteria){ Q5%$P\
return(List) getHibernateTemplate f+3ico]f@
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().execute(new HibernateCallback(){ rF n%e
publicObject doInHibernate $r> $
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(Session session)throws HibernateException { }7Lo}}
Criteria criteria = 8d4:8}
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detachedCriteria.getExecutableCriteria(session); ly_@dsU'
return criteria.list(); MX*T.TG8
} ;&iZ{
}, true); n{Ce%gy
} -O&u;kh4g
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public int getCountByCriteria(final "p Rr>F a
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DetachedCriteria detachedCriteria){ ?so=k&I-M
Integer count = (Integer) nrFuhW\r
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getHibernateTemplate().execute(new HibernateCallback(){ ko7*9`
publicObject doInHibernate '>"riEk
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(Session session)throws HibernateException { %1JN%
Criteria criteria =
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` @PHV
detachedCriteria.getExecutableCriteria(session); N*mm[F2+F
return HLL:nczj
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criteria.setProjection(Projections.rowCount heizO",8.&
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()).uniqueResult(); V?[dg^*0
} n PAl8
}, true);
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return count.intValue(); T> < Vw
} 3)ZdT{MY
} 'L k&iph
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用户在web层构造查询条件detachedCriteria,和可选的 -O~V4004
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 W]TO%x{
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PaginationSupport的实例ps。 (>)f#t[9J
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ps.getItems()得到已分页好的结果集 VX'cFqrK3
ps.getIndexes()得到分页索引的数组 th4yuDPuA
ps.getTotalCount()得到总结果数 ' K\ $B_
ps.getStartIndex()当前分页索引 Fv!KLw@
ps.getNextIndex()下一页索引 @lO(QpdG
ps.getPreviousIndex()上一页索引 ^Gt9.
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 +\D?H.P
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 9$iDK$%
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一下代码重构了。 \J?l7mG
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我把原本我的做法也提供出来供大家讨论吧: B098/`r
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首先,为了实现分页查询,我封装了一个Page类: }b$W+/M\
java代码: FHv^^u'@
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/*Created on 2005-4-14*/ ^ALR.N+<
package org.flyware.util.page; M~SbIk<#a<
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/** v "Yo
* @author Joa 0DQ\akh
* w1q`
*/ JsY|Fv
publicclass Page { cZFG~n/
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/** imply if the page has previous page */ ,T<q"d7-#
privateboolean hasPrePage; '^#=,+ A
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/** imply if the page has next page */ iQ7S*s+l5O
privateboolean hasNextPage; !h[xeLlU
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/** the number of every page */ fk)5TPc^
privateint everyPage; ]Lz:oV^%
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/** the total page number */ NAnccB D!{
privateint totalPage; @5tW*:s
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/** the number of current page */ grWmF3c#
privateint currentPage; f?P>P23
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/** the begin index of the records by the current O
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query */ Dqz9NB
privateint beginIndex; t_\;G~O9-M
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/** The default constructor */ 8+=-!":]
public Page(){ >x0)
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} : l&g5
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/** construct the page by everyPage tY>_+)oi
* @param everyPage R&P}\cf8T
* */ 3`%U)gCT5
public Page(int everyPage){ H-ewO8@
this.everyPage = everyPage; <JkmJ/X
} 8-clL\bm
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/** The whole constructor */ "eOFp\vPr
public Page(boolean hasPrePage, boolean hasNextPage, S)L(~N1
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int everyPage, int totalPage, S1&Df%Ra
int currentPage, int beginIndex){ 2nsW)bd
this.hasPrePage = hasPrePage; r@v_hc
this.hasNextPage = hasNextPage; Ph Ep3o&"
this.everyPage = everyPage; 2J0N]`|)
this.totalPage = totalPage; PD$@.pib
this.currentPage = currentPage; UX!)\5-
this.beginIndex = beginIndex; Pko2fJt1
} lQ!)0F
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/** Pi&8!e<
* @return f;Uf=.#F
* Returns the beginIndex. %`b
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*/ 8*[Q{:'.
publicint getBeginIndex(){ `^#V1kRmH
return beginIndex; }_GI%+t
} p^/6Rb"e
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/** WiBO8N,%`
* @param beginIndex 9EI Oa/*
* The beginIndex to set. qQ=\R1l
*/ VzZ'W[/7)B
publicvoid setBeginIndex(int beginIndex){ ZL{\M|@jz
this.beginIndex = beginIndex; E>2~cC*
} .*acw
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/** 1 Ka,u20
* @return gxf{/EjH
* Returns the currentPage. ,MRAEa2
*/ B4d\4S_r%
publicint getCurrentPage(){ 8e{S(FZ7Ed
return currentPage; BL?Bl&p(
} oBqWIXM
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/** //W7$DYEG
* @param currentPage g[ dI%
* The currentPage to set. nJ{vO{N
*/ SuuLB6{u3
publicvoid setCurrentPage(int currentPage){ \cKY{(E
this.currentPage = currentPage; pjVF^gv,*
} YKtF)N;m]
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/** I&lb5'6D
* @return &Bfgvws;
* Returns the everyPage. 5:W5@e{
*/ (s?Rbd
publicint getEveryPage(){ Fu;\t 0
return everyPage; !da[#zK
} -Nn@c|fz
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/** o{n)w6P{R,
* @param everyPage +T|M U
* The everyPage to set. tITx+i
*/ 07FS|>DM'Z
publicvoid setEveryPage(int everyPage){ T|fmO<e*n
this.everyPage = everyPage; E]<Ce;Vj
} !Ic{lB
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/** npD`9ff
* @return VGDds
* Returns the hasNextPage. ^S]-7>Yyr
*/ fVJsVZ"6v`
publicboolean getHasNextPage(){ C % d
return hasNextPage; G{C27k>wa
} ZA>p~Zt
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/** [@RJ2q$
* @param hasNextPage :
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* The hasNextPage to set. 7=e!k-G
*/ tn@MOOPl
publicvoid setHasNextPage(boolean hasNextPage){ l{u2W$8
this.hasNextPage = hasNextPage; Uw:gJ9
} XC NM
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/** |5(<
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* @return Ivdg1X
* Returns the hasPrePage. ?oKY"C8/
*/ SA1|7
publicboolean getHasPrePage(){ ^ .]]0Rp&
return hasPrePage; }%m:^*@$9
} iR`c/
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/** v\;hI5WY
* @param hasPrePage Ev' BmDk
* The hasPrePage to set. NjL^FqA[
*/ afJ`1l
publicvoid setHasPrePage(boolean hasPrePage){ R,'`
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this.hasPrePage = hasPrePage; Z[&7NJo(
} fQ@k$W\
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/** ,*Vt53@E
* @return Returns the totalPage. _r6aLm2n
* $cUTe
*/ 'I tsu~fza
publicint getTotalPage(){ v]tNJ=aI
return totalPage; ==i:*
} 9)Jc'd|
oK! W<#
/** |D
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* @param totalPage }/{G
* The totalPage to set. y_mD9bgW
*/ 5V{ B,T
publicvoid setTotalPage(int totalPage){ /<\B8^yQ
this.totalPage = totalPage; Ul41RNy)
} i5QG_^X&
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} q')MKR*
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 [^U#ic>cT
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个PageUtil,负责对Page对象进行构造: WrS|$: 0
java代码: b.<>CG'
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/*Created on 2005-4-14*/ oZY2K3J)
package org.flyware.util.page; Hvm+Tr2@
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import org.apache.commons.logging.Log; C#y[UM5\k;
import org.apache.commons.logging.LogFactory; |#r[{2sS
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/** m
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* @author Joa jf_0IE
* N<xf=a+j
*/ 7,\Uk|
publicclass PageUtil { Or0eY#c
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privatestaticfinal Log logger = LogFactory.getLog 4|&