Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Z^P]-CB|6A
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 l# -4}95
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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 Rg4'9I%B
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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 ;W ZA
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分页支持类: bf~gWzA
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java代码: \W"N{N
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package com.javaeye.common.util; jt({@;sU[<
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import java.util.List; q]1HCWde
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publicclass PaginationSupport { @I\&-Z ^
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publicfinalstaticint PAGESIZE = 30; k]J!E-yI8
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privateint pageSize = PAGESIZE; iw`,\V&
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privateList items;
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privateint totalCount; bnll-G|
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privateint[] indexes = newint[0]; `5VEGSP]
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privateint startIndex = 0; <
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public PaginationSupport(List items, int g>])O
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totalCount){ iy{n"#uX
setPageSize(PAGESIZE); xwSi}.
setTotalCount(totalCount); + -[M 7J
setItems(items); $UgQ1Qc
setStartIndex(0); 2(_+PQ6C=
} b<]--\
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public PaginationSupport(List items, int F*&A=@/3
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totalCount, int startIndex){ N>Dr
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setPageSize(PAGESIZE); 6EHYIN^D
setTotalCount(totalCount); <"Ox)XG3]W
setItems(items); -\Y"MwIED
setStartIndex(startIndex); DK!QGATh
} j3<|X
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public PaginationSupport(List items, int ;0)|c}n+.5
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totalCount, int pageSize, int startIndex){ Idy{(Q
setPageSize(pageSize); R`)^eqB
setTotalCount(totalCount); PEKU
setItems(items); 0?]Y^:
setStartIndex(startIndex); $L~?!u&N
} J>H$4t#HX
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publicList getItems(){ ^jY'Hj.Bs
return items; RnvPqNs
} oCl
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publicvoid setItems(List items){ F XpI-?#E<
this.items = items; ]n8
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} r8o9C
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publicint getPageSize(){ '}\#bMeObg
return pageSize; h.A@o#x
} RmR-uQU-c
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publicvoid setPageSize(int pageSize){ W%3<"'eP
this.pageSize = pageSize; JG]67v{F
} 9VEx0mkdd
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publicint getTotalCount(){ 7Wd}H Z
return totalCount; k0%*{IVPN
} 0|1)cO}Dy
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publicvoid setTotalCount(int totalCount){ i ,[S1g
if(totalCount > 0){ )oEHE7 y
this.totalCount = totalCount; #:^aE|s
int count = totalCount / (qf%,F,_L
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pageSize; v)^8e0vx
if(totalCount % pageSize > 0) \!+sL JP
count++; xWZ87
indexes = newint[count]; tWBfIHiha
for(int i = 0; i < count; i++){ Y|*a,H"_
indexes = pageSize * OGDCC/
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} OKXELP
}else{ ?9Lp@k~TO
this.totalCount = 0; P^wDt14>
} y:C=Ni&,"
} ]c67zyX=%
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publicint[] getIndexes(){ I}?+>cf
return indexes; 5_|Sm=
} XZ|%9#6
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publicvoid setIndexes(int[] indexes){ (%bqeI!ob
this.indexes = indexes; )D_\~n/5
} 5:oteNc3
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publicint getStartIndex(){ SFj:|S=v6j
return startIndex; #@quuiYq
} ?h7,q*rxk
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publicvoid setStartIndex(int startIndex){ !Zr 9t|_
if(totalCount <= 0) @X$~{Vp__
this.startIndex = 0; DdI
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elseif(startIndex >= totalCount) J)*7JX
this.startIndex = indexes E41ay:duAl
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[indexes.length - 1]; RotWMGNK
elseif(startIndex < 0) /Dmuvb|A
this.startIndex = 0; lk<}`#( g
else{ W7\s=t\
this.startIndex = indexes ji8)/
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[startIndex / pageSize]; GKT^rc-YT-
} nm8XHk]
} t08E
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publicint getNextIndex(){ <WWn1k_
int nextIndex = getStartIndex() + [EdX6
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pageSize; \&KfIh8
if(nextIndex >= totalCount) >[$j(k^
return getStartIndex(); HVG:q#=C
else E8`AU<
return nextIndex; 3 P)N,
} EG7.FjnVu
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publicint getPreviousIndex(){ j\/Rjn+:[
int previousIndex = getStartIndex() - "DpgX8lG_
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pageSize; rV5QKz6'
if(previousIndex < 0) gwAZ2w
return0; [M;B
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else K6..N\7
return previousIndex; @xqjAcfg
} a7Xa3 vlpO
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} oP%'8%tk
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抽象业务类 bb@3%r|_<
java代码: [k<w'n*
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/** Klv~#9Si
* Created on 2005-7-12 JX $vz*KF
*/ Qf$3!O}G
package com.javaeye.common.business; 1(nK |
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import java.io.Serializable; n0T>sE-9
import java.util.List; D.ajO^[
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import org.hibernate.Criteria; %]KOxaf_z
import org.hibernate.HibernateException; >3,t`Z:
import org.hibernate.Session; 9 M<3m
import org.hibernate.criterion.DetachedCriteria; _d J"2rx
import org.hibernate.criterion.Projections; ;oT!\$Mu
import +eIX{J\s
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org.springframework.orm.hibernate3.HibernateCallback; sX,."@[
import DV6B_A{kI
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org.springframework.orm.hibernate3.support.HibernateDaoS yE3l%<;q
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upport; f:!b0j
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import com.javaeye.common.util.PaginationSupport; IT5a/;J
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public abstract class AbstractManager extends w~lxWgaY7
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HibernateDaoSupport { :jP4GCxU|
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privateboolean cacheQueries = false; %aHQIoxg
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privateString queryCacheRegion; 2 yY.rs
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publicvoid setCacheQueries(boolean Q!&@aKl
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cacheQueries){ U 5f<4I
this.cacheQueries = cacheQueries; 9D+B~8[SQ
} Q9C;_Up
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publicvoid setQueryCacheRegion(String x_eR/B>
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queryCacheRegion){ r'/H3
this.queryCacheRegion = Pd^v-}[
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queryCacheRegion; 6t0-u~
} _=s{,t
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publicvoid save(finalObject entity){ _1sjsGp>
getHibernateTemplate().save(entity); ^@a|s
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} >kN%R8*Sx
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publicvoid persist(finalObject entity){ -NgL4?p=
getHibernateTemplate().save(entity); rERHfr`OU
} =yy7P[D
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publicvoid update(finalObject entity){ s<;kTReA
getHibernateTemplate().update(entity); kd3vlp
} b f2 B
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publicvoid delete(finalObject entity){ ^vQ,t*Uj=
getHibernateTemplate().delete(entity); PRyZ; @
} ra[*E4P9L*
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publicObject load(finalClass entity, LE1#pB3TG
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finalSerializable id){ &qO#EEqG]
return getHibernateTemplate().load ~$FgiW
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(entity, id); ha -KfkPFE
} FO/[7ZH
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publicObject get(finalClass entity, +YA,HhX9
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finalSerializable id){ ^zs]cFN#%
return getHibernateTemplate().get m+ww
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(entity, id); rCTH 5"
} (X?'}Ur
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publicList findAll(finalClass entity){ 2[;4D/`*
return getHibernateTemplate().find("from &~SPDiu.t
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" + entity.getName()); A/%+AH(
} q#n0!5Lv2
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publicList findByNamedQuery(finalString eInx\/
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namedQuery){ "B~ow{3
return getHibernateTemplate <:tD m
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().findByNamedQuery(namedQuery); \>%.ktG
} ~}g"Fe
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publicList findByNamedQuery(finalString query, P0 va=H
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finalObject parameter){ r z
return getHibernateTemplate Z^ e?V7q
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().findByNamedQuery(query, parameter); wy1xZQ<5
} QS*!3?%
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publicList findByNamedQuery(finalString query, #:5vN-9?
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finalObject[] parameters){ Ca?:x tt
return getHibernateTemplate z
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().findByNamedQuery(query, parameters); h
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} %O!~!'
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publicList find(finalString query){ n'&Cr0{
return getHibernateTemplate().find UZ`G S$D@
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(query); h5x_Vjj
} :+G1=TuXw~
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publicList find(finalString query, finalObject "K7{y4
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parameter){ 3V,$FS]
return getHibernateTemplate().find %B,>6 `[
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(query, parameter); iEtnwSt
} i"#36CVT~
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public PaginationSupport findPageByCriteria *G<K@k
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(final DetachedCriteria detachedCriteria){ e)Be*J]4
return findPageByCriteria d^0vaX6e}
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); O e-FI+7
} 3kAhvL
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public PaginationSupport findPageByCriteria 2]$
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(final DetachedCriteria detachedCriteria, finalint 2=&4@c|cn
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startIndex){ ?gp:uxq,.
return findPageByCriteria ^F>C|FJ2
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(detachedCriteria, PaginationSupport.PAGESIZE, : J3_g<@
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startIndex); QO0#p1fom'
} W+F^(SC\
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public PaginationSupport findPageByCriteria D8`dEB2|S
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(final DetachedCriteria detachedCriteria, finalint 5#DtaVz
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pageSize,
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finalint startIndex){ +A
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return(PaginationSupport) 9`A}-YA!
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getHibernateTemplate().execute(new HibernateCallback(){ b3>`%?A
publicObject doInHibernate 2|LgUA?<
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(Session session)throws HibernateException { +"u6+[E
Criteria criteria = J%Cn
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detachedCriteria.getExecutableCriteria(session); %\ifnIQ
int totalCount = SuO@LroxTB
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((Integer) criteria.setProjection(Projections.rowCount ([mC!d@a
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()).uniqueResult()).intValue(); MmZs|pXk
criteria.setProjection 'Ti7}K
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(null); h#Z5vH
List items = 5Tl3k=o}
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criteria.setFirstResult(startIndex).setMaxResults jm~qD
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(pageSize).list(); %, U@ D4w
PaginationSupport ps = ?qdZ]M4e
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new PaginationSupport(items, totalCount, pageSize, <b5J"i&m
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startIndex); gbC!>LV
return ps; w2o%{n\L
} THFzC/~Q
}, true); _&U5 u
} Po~u-5
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public List findAllByCriteria(final XOdkfmc+s'
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DetachedCriteria detachedCriteria){ ^:(:P9h
return(List) getHibernateTemplate Ah_Ttj
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().execute(new HibernateCallback(){ JfrPK/Vn
publicObject doInHibernate uoryxKRjc~
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(Session session)throws HibernateException { }"sZ)FE
Criteria criteria = K;n5[o&c
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detachedCriteria.getExecutableCriteria(session); $69ef[b
return criteria.list(); GC<zL}
} _YT9zG
}, true); '&|]tu:q
} :epjJ1mW
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public int getCountByCriteria(final aCwb[7N
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DetachedCriteria detachedCriteria){ +FYQ7UE
Integer count = (Integer) `akbzHOM
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getHibernateTemplate().execute(new HibernateCallback(){ K<3$>/|
publicObject doInHibernate 3Mw2;.rk
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(Session session)throws HibernateException { >_<J=8|E
Criteria criteria = VkD8h+)
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detachedCriteria.getExecutableCriteria(session); 'u%;5;%2
return 0VA$
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criteria.setProjection(Projections.rowCount J4xJGO
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()).uniqueResult(); QIcg4\d%s
} gO E3x^X*{
}, true); DH5]Kzb/
return count.intValue(); _BA2^C':c{
} us:V\V
} +(*;F4>
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用户在web层构造查询条件detachedCriteria,和可选的 [T5z}!_y
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 v+3-o/G7
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PaginationSupport的实例ps。 XHN`f#(w
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ps.getItems()得到已分页好的结果集 X+:>&&9
ps.getIndexes()得到分页索引的数组 B;r o(R
ps.getTotalCount()得到总结果数 nhUL{ER
ps.getStartIndex()当前分页索引 $oJ)W@>
ps.getNextIndex()下一页索引 XO=UKk+EK
ps.getPreviousIndex()上一页索引 * MJl(
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 [\j@_YYd
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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 ddR_+B*H
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一下代码重构了。 ""dX4^gtU
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我把原本我的做法也提供出来供大家讨论吧: R/yOy^<
Qe~2'Hw#9
首先,为了实现分页查询,我封装了一个Page类: }x[d]fcC
java代码: $rZ:$d.C
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/*Created on 2005-4-14*/ CKAs3",
package org.flyware.util.page; x bG'![OX
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/** XZcT-w7
* @author Joa 4b" %171
* [ imC21U
*/ 3wS{@'
publicclass Page { ^UF]%qqOn
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/** imply if the page has previous page */ V/0?0VKG
privateboolean hasPrePage; 8e'0AI_>
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/** imply if the page has next page */ m_%1IJ
privateboolean hasNextPage; 5-277?
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/** the number of every page */ `.# l_-U{
privateint everyPage; L`i#yXR
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/** the total page number */ /!o(Y8e>x
privateint totalPage; #\+TKK
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/** the number of current page */ K8dlECy
privateint currentPage; mx#H+:}&r
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/** the begin index of the records by the current :x*8*@kC
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query */ mm3goIi;Y
privateint beginIndex; :E|HP#iwu
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/** The default constructor */ .+G),P)
public Page(){ w;.'>ORC
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} -jB1tba
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/** construct the page by everyPage , #yE#8
* @param everyPage H_'i.t 'SS
* */ 2,nKbE9*
public Page(int everyPage){ S;$@?vF
this.everyPage = everyPage; %/dYSC
} NyD[9R?
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/** The whole constructor */ \?[#>L4
public Page(boolean hasPrePage, boolean hasNextPage, lrjlkgSN
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