Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 won;tO]\;@
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 [(U:1&x&
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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 nZe2bai
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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 F$P8"q+
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。 iE$qq~%
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分页支持类: 6m_
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java代码: :,03)[u{8
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package com.javaeye.common.util; ?zW4|0
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import java.util.List; _oK*1#Rm8
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publicclass PaginationSupport { iIFM 5CT
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publicfinalstaticint PAGESIZE = 30; Coz\fL
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privateint pageSize = PAGESIZE; b6sj/V8
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privateList items; K[JbQ30
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privateint totalCount; 5[3vup?
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privateint[] indexes = newint[0]; WPT0=Hqp7
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privateint startIndex = 0; ._j9^Ll
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public PaginationSupport(List items, int x"q!=&>f
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totalCount){ ^$-ID6
setPageSize(PAGESIZE); `6a
setTotalCount(totalCount); 3oX\q/$
setItems(items); NuZiLtC
setStartIndex(0); H&`0I$8m
} "NR`{1f:O
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public PaginationSupport(List items, int Fd!Np7xw
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totalCount, int startIndex){ qKu/~0a/
setPageSize(PAGESIZE); JB.f7-
setTotalCount(totalCount); M?m Pi 3
setItems(items); .YYfba#{
setStartIndex(startIndex); ,@1rP 55
} !Au'WJfE
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public PaginationSupport(List items, int 6U|An*
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totalCount, int pageSize, int startIndex){ .!|\Y!]^r
setPageSize(pageSize); XS+2OutVo
setTotalCount(totalCount); E Dh$UB)
setItems(items); vz'/]E
setStartIndex(startIndex); XFJGL!wWm[
} jpijnz{M
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publicList getItems(){
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return items; ]\DZW4?'
} [t#xX59
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publicvoid setItems(List items){ 66ULR&D8
this.items = items; PM]|S`
} fCC^hB]'
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publicint getPageSize(){ r{oRN
return pageSize; *?Hc8y-dG,
} 44@yQ?
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publicvoid setPageSize(int pageSize){ =+>cTV
this.pageSize = pageSize; .8[*`%K>
} tZ|0wPp
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publicint getTotalCount(){ n{'LF #4l
return totalCount; f8ucJ.{"
} >#pZ`oPEAv
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publicvoid setTotalCount(int totalCount){ P_e9>t@
if(totalCount > 0){ >+}yI}W;e
this.totalCount = totalCount; Tfsx&k\
int count = totalCount / Lt'FA
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pageSize; /:S&1'=
if(totalCount % pageSize > 0) 3`
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count++; p;nRxi7'
indexes = newint[count]; o'Rr2,lVi
for(int i = 0; i < count; i++){ 3UXaA;
indexes = pageSize * 7LotN6H
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i; $W_sIS0\z
} OoIs'S-Z#
}else{ _z6_mmMp
this.totalCount = 0; (AIgW
} c+a" sx\
} :X+!W_xR
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publicint[] getIndexes(){ #/"?.Z;SSH
return indexes; )h0
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} 85e!)I_
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publicvoid setIndexes(int[] indexes){ v?6g.
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this.indexes = indexes; =&8 Cg
} )#%v1rR
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publicint getStartIndex(){ 1iLrKA
return startIndex; e-E0Bp
} 6j2mr6o
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publicvoid setStartIndex(int startIndex){ f3;.+hJ])
if(totalCount <= 0) bz'#YM
this.startIndex = 0; zEBUR%9
elseif(startIndex >= totalCount) NQ3EjARZt
this.startIndex = indexes UiE 1TD{
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[indexes.length - 1]; wf` e3S
elseif(startIndex < 0) (JX 9c
this.startIndex = 0; /^M|$JRI
else{ MP6Py@J45
this.startIndex = indexes ;N(9nX}%)
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[startIndex / pageSize]; ;ElwF&"!X
} n[E/O}3& /
} %96l(JlJ)B
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publicint getNextIndex(){ Fo.p}j+>
int nextIndex = getStartIndex() + 'nQQqx%v
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pageSize; oVAY}q|wU
if(nextIndex >= totalCount) :iEIo7B
return getStartIndex(); n=iL6Yu(
else =zsA@UM0
return nextIndex; -hU1wX%U
} 1}/37\
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publicint getPreviousIndex(){ JIOeDuw+
int previousIndex = getStartIndex() - wSPwa,)7s
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pageSize; x\K9|_!
if(previousIndex < 0) . UaLP
return0; '_fj:dy
else a<CJ#B2K
return previousIndex; NK!#K>AO
} Y'U]!c9
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} /RBIZ_
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抽象业务类 5sZqX.XVF
java代码: X%R )
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/** )YY8`\F>1
* Created on 2005-7-12 ozUsp[W>
*/ f=cj5T:[
package com.javaeye.common.business; \N a
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import java.io.Serializable; aB ^`3J
import java.util.List; 2]'cj
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import org.hibernate.Criteria; j21>\K!p
import org.hibernate.HibernateException; @g%^H)T
import org.hibernate.Session; u;Rm/.
import org.hibernate.criterion.DetachedCriteria; m#|h22^H
import org.hibernate.criterion.Projections; /VHQ!Wi
import 4NDT5sL
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org.springframework.orm.hibernate3.HibernateCallback; Xf6\{
import #-7m@EU;O
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3
org.springframework.orm.hibernate3.support.HibernateDaoS pT<}n 9yB5
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upport; :TRhk.
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import com.javaeye.common.util.PaginationSupport; f\X7h6k8{
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public abstract class AbstractManager extends <7*d2
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HibernateDaoSupport { cL+bMM$4r~
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privateboolean cacheQueries = false; 8T"8C
@$R^-_m
privateString queryCacheRegion; \rSofn#c
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publicvoid setCacheQueries(boolean \}:;kO4f
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cacheQueries){ |'!9mvt=
this.cacheQueries = cacheQueries; M d.^r5r
} cNG`-+U'
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publicvoid setQueryCacheRegion(String !f01.Tq8
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queryCacheRegion){ |wkUnn4UB8
this.queryCacheRegion = a~wlD.P
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queryCacheRegion; Jl-:@[;
} ,r,$x4*
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publicvoid save(finalObject entity){ 8],tGMu
getHibernateTemplate().save(entity); It8s#o q8
} -`ss7j&b3
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publicvoid persist(finalObject entity){ LNOz.2fr>
getHibernateTemplate().save(entity); -:|t^RM;FT
} I`uOsZBO/
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publicvoid update(finalObject entity){ v{O(}@
getHibernateTemplate().update(entity); &H:2TL!
} k{E!X
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publicvoid delete(finalObject entity){ l5<&pb#b
getHibernateTemplate().delete(entity); qMmhVUx
} qs3V2lvYw{
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publicObject load(finalClass entity, #sb@)Q
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finalSerializable id){ x.ucsb
return getHibernateTemplate().load w'&QNm>
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(entity, id); Z3N^)j8
} H{ +[
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publicObject get(finalClass entity, !Nx'4N`&l
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finalSerializable id){ Ybp';8V
return getHibernateTemplate().get pe>[Ts`2F
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(entity, id); Z>_F:1x
} 9PWqoz2c
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publicList findAll(finalClass entity){ `FRdo
return getHibernateTemplate().find("from arb'.:[z^
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" + entity.getName()); 6rh^?B
} n7iIY4gZ
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publicList findByNamedQuery(finalString Xo
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namedQuery){ 9IJc9Sv(
return getHibernateTemplate U
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().findByNamedQuery(namedQuery); ?;ovh nY)
} 4N_iHe5U
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publicList findByNamedQuery(finalString query, B;r` 1
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finalObject parameter){ hs?cV)hDS
return getHibernateTemplate ITf4PxF
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().findByNamedQuery(query, parameter); ^-dhz88wV
} '=cAdja
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publicList findByNamedQuery(finalString query, Y%#r&de
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finalObject[] parameters){ >m4HCs>
return getHibernateTemplate lzK,VZ=mM
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().findByNamedQuery(query, parameters); :z a:gs0
} W,|JocDq
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publicList find(finalString query){ YV)h"u+@0
return getHibernateTemplate().find (laVmU?I7
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(query); 6+W`:0je
} c|(&6(r
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publicList find(finalString query, finalObject V[avV*;3i
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parameter){ VD+y4t'^
return getHibernateTemplate().find z0xw0M+X
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(query, parameter); 0%;y'd**Ck
} /}R*'y
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public PaginationSupport findPageByCriteria nPj
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(final DetachedCriteria detachedCriteria){ ?f4jqF~Fh
return findPageByCriteria G\/7V L
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); S*S@a4lV7
} YHfk; FI
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public PaginationSupport findPageByCriteria ghDOz
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(final DetachedCriteria detachedCriteria, finalint s#%P9A
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startIndex){ N2\{h(*u
return findPageByCriteria }o2e&.$4d
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(detachedCriteria, PaginationSupport.PAGESIZE, M}qrF~
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startIndex); Iv51,0A
} 4=7h1qex
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public PaginationSupport findPageByCriteria < SvjvV
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(final DetachedCriteria detachedCriteria, finalint &v.Nj9{zi
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pageSize, Erq%Ck(
finalint startIndex){ *;Gn od<
return(PaginationSupport) d <Rv~F@
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getHibernateTemplate().execute(new HibernateCallback(){ Z Ne(sg~G
publicObject doInHibernate o 12wp
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(Session session)throws HibernateException { ;}QM#5Xdt
Criteria criteria = ZmzYJ$:6
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detachedCriteria.getExecutableCriteria(session); yvt
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int totalCount = Pef$-3aP>E
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((Integer) criteria.setProjection(Projections.rowCount <v[UYvZvY
{B)-+0 6
()).uniqueResult()).intValue(); UQ.DKUg
criteria.setProjection :Kx6|83
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(null); ];hK5
List items = 'D17]Lp~.
UY`U[#
criteria.setFirstResult(startIndex).setMaxResults H3Sfz'
P#N@W_""YD
(pageSize).list(); Y0ouLUlI
PaginationSupport ps = *|^}=ioj*
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new PaginationSupport(items, totalCount, pageSize, drW}w+!
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startIndex); IM*T+iRKqF
return ps; YCS8qEP&
} dXewS_7
}, true); .|x"'3#
} xe9V'wICp(
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public List findAllByCriteria(final PBY^m+
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DetachedCriteria detachedCriteria){ Z9k"&F~u}
return(List) getHibernateTemplate {[$JiljD
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().execute(new HibernateCallback(){ ns`njx}C
publicObject doInHibernate ^:64(7
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(Session session)throws HibernateException {
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Criteria criteria = PR;A 0
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detachedCriteria.getExecutableCriteria(session); 4}MZB*);0
return criteria.list();
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} VVVw\|JB>
}, true); PDtLJt$
} J'4V_Kjg-
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public int getCountByCriteria(final NkL>ru!b9
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DetachedCriteria detachedCriteria){ x9B5@2J1
Integer count = (Integer) J4>k9~q
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getHibernateTemplate().execute(new HibernateCallback(){ &HIG776
publicObject doInHibernate GK\`8xWE
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(Session session)throws HibernateException { HVkq{W|w
Criteria criteria = #(f- cK
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detachedCriteria.getExecutableCriteria(session); SRBQ"X[M2
return `8<h aU
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criteria.setProjection(Projections.rowCount siK:?A@4D
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()).uniqueResult(); JtGBNz!"
} QZ^P2==x
}, true); N9jSiRJ
return count.intValue(); (J,^)!g7
} ,!'L~{
} 1@p'><\
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用户在web层构造查询条件detachedCriteria,和可选的 _7qGo7bpN
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ts=KAdcJ
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PaginationSupport的实例ps。 DC6xet{
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ps.getItems()得到已分页好的结果集 &R~)/y0]
ps.getIndexes()得到分页索引的数组 \CDzVO0^
ps.getTotalCount()得到总结果数 t9(sSl
ps.getStartIndex()当前分页索引 5U5)$K'OA
ps.getNextIndex()下一页索引 ,a1
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ps.getPreviousIndex()上一页索引 -&3mOn& (1
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 v#WD$9QWs
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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 R}VEq gq
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一下代码重构了。 *&A/0]w
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我把原本我的做法也提供出来供大家讨论吧: pXBlTZf
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首先,为了实现分页查询,我封装了一个Page类: 7m+d;x2
java代码: @h$4M t7N
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/*Created on 2005-4-14*/ %tC3@S
package org.flyware.util.page; #HF;yAc
#mK?K
/** hfQx$cv6
* @author Joa \~bx%VWW4
* X!/o7<
*/ Z;4pI@u
publicclass Page { $Z!7@_Ys
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/** imply if the page has previous page */ C^W9=OH
privateboolean hasPrePage; P6
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/** imply if the page has next page */ uBXl ltU
privateboolean hasNextPage; pk5W!K
tH\ aHU[
/** the number of every page */ ;4]
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privateint everyPage; k~+(X|!5w
nL]-]n;
/** the total page number */ |wYOO(!
privateint totalPage; 3duWk sERC
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/** the number of current page */ :2_8.+:
privateint currentPage; yw3E$~ k
}jWZqIqj
/** the begin index of the records by the current S85}&\m&4
Ebk_(Py\
query */ 5l
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privateint beginIndex; P.Uz[_&l6
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/** The default constructor */ JDA :)[;
public Page(){ p[Yja y+
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} K9 tuiD+j
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/** construct the page by everyPage (ev(~Wc
* @param everyPage alB[/.1
* */ PpF"n[j
public Page(int everyPage){ (g>>
this.everyPage = everyPage; +>,4d
} _Uxt9 X
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/** The whole constructor */ eJv_`#R&Of
public Page(boolean hasPrePage, boolean hasNextPage, Q\ AM]
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int everyPage, int totalPage, 6JYVC>i
int currentPage, int beginIndex){ w?LDaSz\t
this.hasPrePage = hasPrePage; Np?%pB!Q
this.hasNextPage = hasNextPage; 6)B6c. 5o
this.everyPage = everyPage; [LHx9(,NM
this.totalPage = totalPage; A^9RGz4=
this.currentPage = currentPage; %1Pn;bUU!
this.beginIndex = beginIndex; !L)~*!+Gf
} ?k7z5ow
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/** wh~g{(Xvq
* @return r6#It$NU
* Returns the beginIndex. 6AW{qU6
*/ Eoo[)V#x{
publicint getBeginIndex(){ ee0)%hc1t
return beginIndex; vg6'^5S7
} jZX2)# a!
@TTB$
/** }%;o#!<N(@
* @param beginIndex V&75n.L
* The beginIndex to set. j~ )GZV
*/ .*bu:FuDE
publicvoid setBeginIndex(int beginIndex){ MI,b`pQ
this.beginIndex = beginIndex; Q{~ WWv
} vA r
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/** 1oSrhUTy
* @return $%3"@$
* Returns the currentPage. ? !dy
*/ v9t26>{~
publicint getCurrentPage(){ [1\k'5rp
return currentPage; !M&Qca2
} .P|_C.3-l
!&n'1gJ)kd
/** oJLpFL
* @param currentPage { vf"`#Q9
* The currentPage to set. /4}B}"`Sl=
*/ mT7B#^H
publicvoid setCurrentPage(int currentPage){ kX2bU$1Q,i
this.currentPage = currentPage; {H5a.+-(bE
} ~_ 8X%uty
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/** C " W,
* @return b,8\i|*!f
* Returns the everyPage. `=zlS"dQ
*/ qkEre
publicint getEveryPage(){ ?Bdhn{_
return everyPage; !FqJP
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} /g_cz&luR
zB?} {@
/** p:GB"e9>H
* @param everyPage b3Uw"{p
* The everyPage to set. fXV+aZ
*/ 41S.&-u
publicvoid setEveryPage(int everyPage){ 7l%]/`Y-
this.everyPage = everyPage; _Prh&Q1zs
} srh>"
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/** Ob+Rnfx37
* @return M$9?{8m
* Returns the hasNextPage. m!qbQMXn
*/ IsC`r7
publicboolean getHasNextPage(){ +p%!G1Yz
return hasNextPage; 3Dd"qON!
} Fbpe`pS+V
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/** OVo3.
* @param hasNextPage _>G.
* The hasNextPage to set. \%qzTk.&r
*/ =41g9UQ
publicvoid setHasNextPage(boolean hasNextPage){ UcHe"mn
this.hasNextPage = hasNextPage; Cm~Pn"K_]
} g p2S
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/** /{[Y l[{"<
* @return DxFmsjX[L
* Returns the hasPrePage. cL]vJ`?Ih
*/ .;1tu+S
publicboolean getHasPrePage(){ *Va ;ra(V2
return hasPrePage; =Ts3O0"[
} Hz*5ZIw
.9cQq/{b
/** x?aNK$A~X
* @param hasPrePage n7J6YtUwP
* The hasPrePage to set. Mx3MNX/
*/ 7O=N78M
publicvoid setHasPrePage(boolean hasPrePage){ bp>-{Nv
this.hasPrePage = hasPrePage; -|"[S"e
} TQ/EH~Sz
JZa^GW:YQh
/** rkF>c
* @return Returns the totalPage. fbG+.'
* `Mh3v@K:
*/ &!xePKvO6k
publicint getTotalPage(){ ko2T9NI:S
return totalPage; W7F1o[
} $j+RUelFY
9?jD90@
}
/** BrHw02G
* @param totalPage ,m`>
* The totalPage to set. r~q(m>Ct6
*/ #K:!s<_"
publicvoid setTotalPage(int totalPage){ WS!:w'rzr
this.totalPage = totalPage; fI_I0dc.p
} z frEM
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} L[|($vQ"
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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 8NE+G.:G
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个PageUtil,负责对Page对象进行构造: ho'Ihep,L
java代码: L<}0}y
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t-;zgW5mwF
/*Created on 2005-4-14*/ iFJ1}0<(x
package org.flyware.util.page; R/_bk7o]H
zF)&o}
import org.apache.commons.logging.Log; Ug VLHwkvk
import org.apache.commons.logging.LogFactory; @26gP:Um
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/** )U?5O$M;lE
* @author Joa -E$(<Pow~\
* ty W5k(>
*/ R2e":`0I
publicclass PageUtil { *NC9S,eSP
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privatestaticfinal Log logger = LogFactory.getLog ]g3RVA%\l
5 $vUdDTg
(PageUtil.class); ep$C
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/** YQH=]5r
* Use the origin page to create a new page )$>
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* @param page KE~l#=S
* @param totalRecords $+P6R`K
* @return A=PJg!
*/ yx@%x?B
publicstatic Page createPage(Page page, int E.'v,GYe
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totalRecords){ -->~<o
return createPage(page.getEveryPage(), g5YDRL!Wh
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page.getCurrentPage(), totalRecords); -lb,0
} 1GaM!OC 9
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/** lWR".
* the basic page utils not including exception |+aUy^
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handler -](NMRqfN
* @param everyPage 0E<