Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 1#BMc%
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 e%_2n=p~)%
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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 ;
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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 BVAxeXO
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分页支持类: aYc*v5QN3
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java代码: 'a8{YT4
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package com.javaeye.common.util; >9F&x>~
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import java.util.List; "_!D
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publicclass PaginationSupport { };{V]f 0
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publicfinalstaticint PAGESIZE = 30; l0hcNEj{W
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privateint pageSize = PAGESIZE; <OF2\#Nh
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privateList items;
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privateint totalCount; @ Gxnrh6
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privateint[] indexes = newint[0]; jx*jYil
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privateint startIndex = 0; "N'|N.,
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public PaginationSupport(List items, int xLID@9Hbu
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totalCount){ |]s/NNU
setPageSize(PAGESIZE); PHZ+u@AA6@
setTotalCount(totalCount); {,V .IDs8[
setItems(items); 0^?:Zds
setStartIndex(0); U7GgGMw
} X9ua&T2(l
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public PaginationSupport(List items, int $Sz@u"ig%
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totalCount, int startIndex){ ~cC=DeX
setPageSize(PAGESIZE); SxyXz8+e[
setTotalCount(totalCount); T
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setItems(items); # !:u*1
setStartIndex(startIndex); ANqWY&f
} 5%` fh%
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public PaginationSupport(List items, int q6R``
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totalCount, int pageSize, int startIndex){ q.xt%`@aA
setPageSize(pageSize); ~8fy
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setTotalCount(totalCount); ]yg3|C;
setItems(items); &A}@@d
setStartIndex(startIndex); 2L\}
} t(d$v_*y51
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publicList getItems(){ ^tp6G
return items; (T&rvE
} yiourR)H<
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publicvoid setItems(List items){
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this.items = items; tsGt,]O30
} )(^L*
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publicint getPageSize(){ K'/,VALp
return pageSize; c~,OU7[
} %8U/!(.g
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publicvoid setPageSize(int pageSize){ ,tZJSfHB
this.pageSize = pageSize; JI"&3H")g%
} c%?31t
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publicint getTotalCount(){ A@:h\<
return totalCount; ->H4!FS
} /RWQ+Zf-Y]
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publicvoid setTotalCount(int totalCount){ [Un~]E.'J
if(totalCount > 0){ roiUVisq*
this.totalCount = totalCount; whoM$ &
int count = totalCount / (L{>la!
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pageSize; =x_~7 Xc{
if(totalCount % pageSize > 0) rzl0*CR
count++; ]H%SGQPn
indexes = newint[count]; moop.}O<
for(int i = 0; i < count; i++){ H{tG:KH
indexes = pageSize * Bsr;MVD
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i; [m*E[0Hu
} G6*P]<
}else{ |o6g{#1
this.totalCount = 0; ET2^1X#j
} Bz7rf^H`Z
} ^0x0 rY
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publicint[] getIndexes(){ Q/u2Q;j>
return indexes; 9Q*T'+V
} DK6^\k][V
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publicvoid setIndexes(int[] indexes){ q3_ceXYU
this.indexes = indexes; &"_5?7_N
} {jK:hQX
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publicint getStartIndex(){ _"4u?C#
return startIndex; d_ [l{
} CO<P$al
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publicvoid setStartIndex(int startIndex){ p?6`mH
if(totalCount <= 0) 1xf
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this.startIndex = 0; P{2ue`w[
elseif(startIndex >= totalCount) 1:.I0x!
this.startIndex = indexes ~uUN\qx52
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[indexes.length - 1]; Ra!Br6
elseif(startIndex < 0) _ Vo35kA
this.startIndex = 0; g)L?C'BG
else{ #Yd'Vve
this.startIndex = indexes bJWPr
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[startIndex / pageSize]; 'zUWO_(
} l(B(gPvU
} mS]&
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publicint getNextIndex(){ 9f|+LN##
int nextIndex = getStartIndex() + F<YXkG4pO
|| }'
pageSize; =N~*`5|rk
if(nextIndex >= totalCount) \LEUreTn
return getStartIndex(); }%}yOLo:
else T {![a{
return nextIndex; W }"n*
} (+iOy/5#u
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publicint getPreviousIndex(){ ==ZL0 ][
int previousIndex = getStartIndex() - XwlF[3VbiX
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pageSize; ->u}b?aF
if(previousIndex < 0) =-dg]Ol8
return0; l|Y?]LNr
else N!Cy)HnS\w
return previousIndex; UXdnN;0
} VUQx"R9-
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} OMz_xm.UPi
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抽象业务类 d95 $w8>
java代码: NGs@z^&V
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/** u|Tg*B
* Created on 2005-7-12 ZR*Dl.GWY
*/ g~v>{F+u
package com.javaeye.common.business; ,?KN;~t#vz
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import java.io.Serializable; MRb6O!$`C
import java.util.List; h3YWqSj
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import org.hibernate.Criteria; 5bHS| <
import org.hibernate.HibernateException; gY/p\kwsj
import org.hibernate.Session; tYzpL
import org.hibernate.criterion.DetachedCriteria; 2l.qINyz
import org.hibernate.criterion.Projections; IPa)+ ZQ
import ;%YAiW8{Xk
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org.springframework.orm.hibernate3.HibernateCallback; of<(4<T
import %-Oo92tP
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org.springframework.orm.hibernate3.support.HibernateDaoS C4.g}q
sqE? U*8.-
upport; ]N4?*S*jd)
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import com.javaeye.common.util.PaginationSupport; ~}@cSv'(1
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public abstract class AbstractManager extends B4kJ 7Pdny
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HibernateDaoSupport { {IG5qi?/E)
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privateboolean cacheQueries = false; abw7{%2
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privateString queryCacheRegion; 6 66f;h
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publicvoid setCacheQueries(boolean =*'K'e>P3
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cacheQueries){ T8US` MZ
this.cacheQueries = cacheQueries; V
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} FI=]K8
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publicvoid setQueryCacheRegion(String o"Mhwh
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queryCacheRegion){ UtzM+7r@
this.queryCacheRegion = 7:P+ S%ZL
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queryCacheRegion; u~7
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} ~Kll.
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publicvoid save(finalObject entity){ d>k"#|
getHibernateTemplate().save(entity); >oasA2S
} t{g7 :A
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publicvoid persist(finalObject entity){ 96]!*}
getHibernateTemplate().save(entity); 3{ FUFx
} En:/{~9{F
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publicvoid update(finalObject entity){ >og-
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getHibernateTemplate().update(entity); 0hoi=W6AQ
} q-5U,!!W/
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publicvoid delete(finalObject entity){ qrt2BT)
getHibernateTemplate().delete(entity); $`'Xb
} RA^-Pa.O
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publicObject load(finalClass entity, k:sFI @g
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finalSerializable id){ SXF~>|h5<
return getHibernateTemplate().load c_dg/!Iu
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(entity, id); DD^iEhG
} /j(3 ~%]o4
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publicObject get(finalClass entity, 5rPK7Jh`B
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finalSerializable id){ 9%6W_0>
return getHibernateTemplate().get QsC6\Gt#
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(entity, id); rFl6xM;F
} n[tES6u
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publicList findAll(finalClass entity){ ,I^:xw_
return getHibernateTemplate().find("from #a|.cm>6
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" + entity.getName()); ]s<}'&
} na-mh
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publicList findByNamedQuery(finalString MFqM6_
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namedQuery){ 9n!IdqKN
return getHibernateTemplate }n[<$*W^
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().findByNamedQuery(namedQuery); 2GW.'\D
} OHyBNJ
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publicList findByNamedQuery(finalString query, ai@hQJ*
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finalObject parameter){ bUS"1Tg]*6
return getHibernateTemplate wN^$8m5\T^
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().findByNamedQuery(query, parameter); ,'z=cB`+o
} eR*y<K(d
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publicList findByNamedQuery(finalString query, #s]'2O
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finalObject[] parameters){ %K7wScz7
return getHibernateTemplate X$(Dem
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().findByNamedQuery(query, parameters); $Q'S8TU
} p|,3X*-ynx
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publicList find(finalString query){ rUOl+p_47
return getHibernateTemplate().find *CS2ndp
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(query); vpL3XYs`
} #V#sg}IhM?
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publicList find(finalString query, finalObject ccm(r~lhJ
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parameter){ Vb$4'K'
return getHibernateTemplate().find A[6D40o
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(query, parameter); =&YhA}l\O
} ]UFbG40Zo
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{
public PaginationSupport findPageByCriteria
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(final DetachedCriteria detachedCriteria){ Z(0sMOaX
return findPageByCriteria GiGXV @dq
. ]D7Il
(detachedCriteria, PaginationSupport.PAGESIZE, 0); w(-h!d51+
}
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public PaginationSupport findPageByCriteria *Z:'jV<
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(final DetachedCriteria detachedCriteria, finalint I {&8iUN
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startIndex){ _oBJ'8R\
return findPageByCriteria \Uh$%#}.
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(detachedCriteria, PaginationSupport.PAGESIZE, ~;uc@GGo
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startIndex); *%;+3SV
} A1uo@W
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public PaginationSupport findPageByCriteria MeMSF8zSQ
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(final DetachedCriteria detachedCriteria, finalint w0(1o_F7.
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pageSize, (m%A>e
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finalint startIndex){ k 3S
return(PaginationSupport) i?0+f}5<p
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getHibernateTemplate().execute(new HibernateCallback(){ ]
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publicObject doInHibernate e|2@z-Sp-
).D+/D/"2
(Session session)throws HibernateException { :y%CP8
Criteria criteria = io{\+%;b~
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detachedCriteria.getExecutableCriteria(session); 8AgKK=C=
int totalCount = kD.KZV
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((Integer) criteria.setProjection(Projections.rowCount bxR6@
BfOQ/k))
()).uniqueResult()).intValue(); PTZ/jg@71
criteria.setProjection wcW8"J'AH
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(null); T\3aT
List items = 5N.-m;s
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criteria.setFirstResult(startIndex).setMaxResults {.mPe|
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(pageSize).list(); Pua|Z
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PaginationSupport ps = {>rGe#Vu
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new PaginationSupport(items, totalCount, pageSize, ?CU6RC n
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startIndex); yDe6f(D
return ps; r)xkpa5
} O~~WP*N
}, true); RF$2p4=[
} |X6/Y@N
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public List findAllByCriteria(final %!X9>i>
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DetachedCriteria detachedCriteria){ rO3.%B}
return(List) getHibernateTemplate |0N6]%r
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().execute(new HibernateCallback(){ lo< t5~GQ
publicObject doInHibernate }fT5(+ Wo
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(Session session)throws HibernateException { 4Fs5@@>X
Criteria criteria = RM|2PG1m
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detachedCriteria.getExecutableCriteria(session); R q
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return criteria.list(); {Uj-x
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} )F,IPAA#
}, true); L5j%4BlK/
} p()#+Xy
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public int getCountByCriteria(final 'JK"3m}nT
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DetachedCriteria detachedCriteria){ X"Ca
Integer count = (Integer) dgp1 B\
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getHibernateTemplate().execute(new HibernateCallback(){ [@;q#.}Z
publicObject doInHibernate ,*MAteD
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(Session session)throws HibernateException { xP+`scv*m#
Criteria criteria = *l{GD1ZDk
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detachedCriteria.getExecutableCriteria(session); 2&o
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return I 6-.;)McO
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criteria.setProjection(Projections.rowCount :}*
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()).uniqueResult(); o|G[/o2
} XDQ5qfE|
}, true); c$P68$FB
return count.intValue(); A}3dx!?7j
} 7U647G(Sg
} `p'682x I
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用户在web层构造查询条件detachedCriteria,和可选的 gzd<D}2F~
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 <{P`A%g@
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PaginationSupport的实例ps。 f>hA+
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ps.getItems()得到已分页好的结果集 d+o.J",E
ps.getIndexes()得到分页索引的数组 C2} f'
ps.getTotalCount()得到总结果数 /N9ct4 {^
ps.getStartIndex()当前分页索引 W\Df:P {<
ps.getNextIndex()下一页索引 E! GH$%:;
ps.getPreviousIndex()上一页索引 c4V%>A
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ?
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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 x:$ xtu
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一下代码重构了。 !rsGCw!Pg
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我把原本我的做法也提供出来供大家讨论吧: 'W*:9wah
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首先,为了实现分页查询,我封装了一个Page类: J!\oH%FJp
java代码: pf$gvL
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/*Created on 2005-4-14*/ y|/[;
package org.flyware.util.page; 1I?`3N
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/** D/YMovH%
* @author Joa i_e%HG
* Dv"HFQuF
*/ Marx=cNj
publicclass Page { UQ#t &
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/** imply if the page has previous page */ Ge7Uety
privateboolean hasPrePage; Nsn~mY%
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/** imply if the page has next page */ $f?GD<}?7r
privateboolean hasNextPage; v>0I=ut
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/** the number of every page */ +"1fr
privateint everyPage; .XT]\'vW
-v! ;
/** the total page number */ gA}?X
privateint totalPage; zfw=U
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/** the number of current page */ wxo*\WLe
privateint currentPage; MY}/h@
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/** the begin index of the records by the current I(H9-!&
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query */ +rJDDIb
privateint beginIndex; :s*t\09V7
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/** The default constructor */ eLIZ<zzW0}
public Page(){ 2<9&OL
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} lK_T%1Gz
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/** construct the page by everyPage U@9v(TfV
* @param everyPage &F:%y(;{Y
* */ WjguM
public Page(int everyPage){ : T{VCw:*
this.everyPage = everyPage; gBr/Y}I
} 1~Z
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/** The whole constructor */ 1-$+@Xl
public Page(boolean hasPrePage, boolean hasNextPage, 2wu\.{6Zp
2H1
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int everyPage, int totalPage, R"j<C13;%
int currentPage, int beginIndex){ CG;+Z-"X
this.hasPrePage = hasPrePage; g:Q:cSg<
this.hasNextPage = hasNextPage; {n&GZG"f
this.everyPage = everyPage; l9e=dV:pH
this.totalPage = totalPage; MOPHu
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this.currentPage = currentPage; z\"9T?zoo
this.beginIndex = beginIndex; k
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}
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/** *R}p9;dpO
* @return ]ddH>y&o
* Returns the beginIndex. V-3;7
*/ eLLOE)x
publicint getBeginIndex(){ ;l^'g}dQ^
return beginIndex; 4V c``Um
} O`$\Plt|v
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/** B}nT>Ub
* @param beginIndex &dPUd~&EL
* The beginIndex to set.
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*/ %k<+#j6ZH
publicvoid setBeginIndex(int beginIndex){ 39MOqVc
this.beginIndex = beginIndex; hXvC>ie(i
} ;66{S'*[
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/** [)?9|yY"`
* @return J:J/AgJuH
* Returns the currentPage. 5`@yX[G
*/ 3,EtyJ3[Bh
publicint getCurrentPage(){ na*Z0y
return currentPage; \TYVAt]
?
} _DAqL@5n
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/** c>3j$D+
* @param currentPage *2fJdY
* The currentPage to set. >6Jz=N,
*/ %mIdQQ,
publicvoid setCurrentPage(int currentPage){ u@P1`E1Q
this.currentPage = currentPage; OsW*@v(
} 4 L
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/** W7;RQ
* @return Al]*iw{
* Returns the everyPage. `4?|yp.|L
*/ jcjl q-x
publicint getEveryPage(){ ~1aM5Ba{
return everyPage; 8)2M%R\THn
} OO'zIC<z
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/** #
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* @param everyPage 0fLd7*1>
* The everyPage to set. -knP5"TB
*/ =Ot_P7'5gv
publicvoid setEveryPage(int everyPage){ Gx4{ 9
this.everyPage = everyPage; )TyP{X>
} ;U$Rd,T4S
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/** !]5V{3
* @return 17`-eDd
* Returns the hasNextPage. ?*[35XUd
*/ g7lPQ_A*
publicboolean getHasNextPage(){ x8x-b>|$&<
return hasNextPage; 1|AY&u%fiP
} fz?woVn
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/** }:u-l3e
* @param hasNextPage ?G<?:/CU
* The hasNextPage to set. B&B