Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 t\R; < x
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ;+Yi.Q/\
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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 G?hK9@ |v
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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 kv?|'DN
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。 9$l>\.6
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分页支持类: 83iCL; GS=
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java代码: `
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package com.javaeye.common.util; <94G
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import java.util.List; 8{I"q[GZ
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publicclass PaginationSupport { =@r--E
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publicfinalstaticint PAGESIZE = 30; d*]Ew=^L
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privateint pageSize = PAGESIZE; pGWA\}'
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privateList items; @}LZ! y
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privateint totalCount; ]]uHM}l
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privateint[] indexes = newint[0]; lZ+!H=`
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privateint startIndex = 0; TZB+lj1
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public PaginationSupport(List items, int =dH$2W)G
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totalCount){ 1]OSWCEm*[
setPageSize(PAGESIZE); QT!5l`
setTotalCount(totalCount); jNl/!l7B
setItems(items); -|_ir-j
setStartIndex(0); ;e s^R?z
} pR$6,Vi
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public PaginationSupport(List items, int F9Z@x)
}GZbo kWg.
totalCount, int startIndex){ B5=($?5^6%
setPageSize(PAGESIZE); :pC;`iQ
setTotalCount(totalCount); 'Cg{_z.~c
setItems(items); lF4u{B9DM
setStartIndex(startIndex); zQ8!rCkg4
} S`q%ypy
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public PaginationSupport(List items, int Nw<P
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totalCount, int pageSize, int startIndex){ 9%DT0.D}$j
setPageSize(pageSize); 9y] J/1#
setTotalCount(totalCount); 9'KonW
setItems(items); #$ 1$T
setStartIndex(startIndex); 4E3g,%9u
} Z`_.x
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publicList getItems(){ d/U."V}
return items; p+w8$8)
} z@h~Vb&I
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publicvoid setItems(List items){ %|IUq jg
this.items = items; X;GfPw.m
} !~ rt:Z
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publicint getPageSize(){ sa#.l% #
return pageSize; %u!XzdG
} ~L?nq@DL
n^9 ?~
publicvoid setPageSize(int pageSize){ )|]dmQ-
this.pageSize = pageSize; &7 [[h+Lb
} 665[
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publicint getTotalCount(){ ?p^2Z6J'$
return totalCount; vq6%Ey3Gix
} ygViPz<J
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publicvoid setTotalCount(int totalCount){ ;A#~`P
if(totalCount > 0){ `/:cfP\
this.totalCount = totalCount; Ot9V< D6h
int count = totalCount / f(:1yl\a
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pageSize; Y E1Hpeb
if(totalCount % pageSize > 0) 9){
count++; 3Sh+u>w
indexes = newint[count]; _<Dt
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for(int i = 0; i < count; i++){ (JZ".En#X
indexes = pageSize * Zhi})d3l
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i; F[E?A95W
} %$mjJw<|&
}else{ kBsXfVs9
this.totalCount = 0; 49h0^;xlo:
} ef]B9J~h
} w6zBVi
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publicint[] getIndexes(){ ?[= U%sPu=
return indexes; SG'JE}jzO
} a G27%(@
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publicvoid setIndexes(int[] indexes){ ]0~qi@
this.indexes = indexes; bBE+jqi2
} R@`rT*lJ
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publicint getStartIndex(){ :pZ}*?\
return startIndex; &8?`<
} Spj9H ?m
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publicvoid setStartIndex(int startIndex){ vjlGX T`m
if(totalCount <= 0) =*MR(b>
this.startIndex = 0; vrIV%l=
elseif(startIndex >= totalCount) 2*OxA%QELM
this.startIndex = indexes Z^_>A)<s<
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[indexes.length - 1]; x)viY5vjH
elseif(startIndex < 0) km 5E)_]
this.startIndex = 0; Ci\? ^
else{ ~j&?/{7I
this.startIndex = indexes +{-]P\oc
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[startIndex / pageSize]; %$9bce-fcG
} <DmTj$
} ^.HWkS`e
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publicint getNextIndex(){ n0fR u`SNV
int nextIndex = getStartIndex() + L;)v&a7[P
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pageSize; GU6qIz|
if(nextIndex >= totalCount) Lb~\Yn'z
return getStartIndex(); {bkGYx5.C
else X;EJ&g/
return nextIndex; !$>G#+y
} KwFXB
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publicint getPreviousIndex(){ u,9q<&,
int previousIndex = getStartIndex() - =cp;Q,t'9L
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pageSize; Y5%;p33uFG
if(previousIndex < 0) }$aNOf%:
return0; ;`j U_
else p24.bLr
return previousIndex; e'~ Q@_D
} pxplWP,
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} s[V`e2O
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抽象业务类 |- OHve4A
java代码: 0yQe5i}
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/** {B^pnLc
* Created on 2005-7-12 4ftj>O
*/ zoXuFg
package com.javaeye.common.business; >hb-5xC
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import java.io.Serializable; AM/lbMr
import java.util.List; l<N?' &
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import org.hibernate.Criteria; P"Rk?lL
import org.hibernate.HibernateException; 4
import org.hibernate.Session; z7q%,yw3N
import org.hibernate.criterion.DetachedCriteria; rWe
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import org.hibernate.criterion.Projections; SALCuo"L
import { _X#fq0}
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org.springframework.orm.hibernate3.HibernateCallback; 3@HIpQM3
import 8S= c^_PJ
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org.springframework.orm.hibernate3.support.HibernateDaoS sZm^&h;
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upport; %kW3hQ<$
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import com.javaeye.common.util.PaginationSupport; Tw}z7U"
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public abstract class AbstractManager extends 0 r3N^_}
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HibernateDaoSupport { /MxCvEE
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privateboolean cacheQueries = false; W_D%|Ub2X
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privateString queryCacheRegion; ee\Gl?VN
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publicvoid setCacheQueries(boolean c#x7N9;"!
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cacheQueries){ ] - h|]
this.cacheQueries = cacheQueries; c}\
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} -;S3|
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publicvoid setQueryCacheRegion(String 4^BLSK~(
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queryCacheRegion){ `#<eA*^g5
this.queryCacheRegion = 0k7"H]J
J\GKqt;5@
queryCacheRegion; 8fEAYRGd
} c0hdLl;5
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publicvoid save(finalObject entity){ x"!#_0TT}
getHibernateTemplate().save(entity); GiFf0c
9
} #PPsRKj3c
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publicvoid persist(finalObject entity){ uTUa4^]*
getHibernateTemplate().save(entity); cnYYs d{
} C}bPv+t
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publicvoid update(finalObject entity){ DW4MA<UQ
getHibernateTemplate().update(entity); ls]Elo8h1f
} 5I_hh?N4Z
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publicvoid delete(finalObject entity){ *<;&>w8
getHibernateTemplate().delete(entity); =mAGD*NKu
} s'2y%E#
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publicObject load(finalClass entity, ur`}v|ZY
@US '{hO1p
finalSerializable id){ ~.!?5(AH8z
return getHibernateTemplate().load ,Zr YJ<
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(entity, id); uk1v7#p
} 0-lPhnrp
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publicObject get(finalClass entity, W>VAbm
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finalSerializable id){ Q0_M-^~WT
return getHibernateTemplate().get !zF4 G,W
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(entity, id); }v,W-gA
} yqC+P
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publicList findAll(finalClass entity){ 8UlB~fVg
return getHibernateTemplate().find("from
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" + entity.getName()); EgCp:L{
} hE9'F(87a
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publicList findByNamedQuery(finalString m|(I} |kT3
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namedQuery){ ?BXP}]
return getHibernateTemplate %y!
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().findByNamedQuery(namedQuery); -aTg>Q|g&
} a [0N,t
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publicList findByNamedQuery(finalString query, #a/n5c&6/
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finalObject parameter){ dawVE
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return getHibernateTemplate 5Q2TT $P
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().findByNamedQuery(query, parameter); W8\PCXnsfl
} 3T Yo
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publicList findByNamedQuery(finalString query, <x.]OZgO
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finalObject[] parameters){ $#g#[/
return getHibernateTemplate eimA *0Cq
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().findByNamedQuery(query, parameters); v GulM<YY
}
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publicList find(finalString query){ ,S7~=S
return getHibernateTemplate().find x)%% 5
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(query); 4Xa.r6T_N=
} ksxO<Y
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publicList find(finalString query, finalObject oaH+c9v
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parameter){ e2,<,~_K6
return getHibernateTemplate().find tr#)iZ\
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(query, parameter); oxxE'cx{g
} ;7B2~zL
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public PaginationSupport findPageByCriteria 'd~, o[x
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(final DetachedCriteria detachedCriteria){ PprQq_j
return findPageByCriteria /zDSlj<c
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); q(w1VcLZ
} }0(vR_x
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public PaginationSupport findPageByCriteria WVBE>TB
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(final DetachedCriteria detachedCriteria, finalint $j$\ccG
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startIndex){ f@,hO5h(_|
return findPageByCriteria >TH-Q[
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(detachedCriteria, PaginationSupport.PAGESIZE, PW~cqo B71
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startIndex); RBHqLg(
} YGZAtSf3z
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public PaginationSupport findPageByCriteria ;mM\,
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(final DetachedCriteria detachedCriteria, finalint ={wjeRp
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pageSize, U)T/.L{0i
finalint startIndex){ JXRmu~W~l
return(PaginationSupport) :IOn`mRYu
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getHibernateTemplate().execute(new HibernateCallback(){ &T|UAM.
publicObject doInHibernate tCF0Ah
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(Session session)throws HibernateException { ta+"lM7A}$
Criteria criteria = eO"\UDBV
} SWA|x
detachedCriteria.getExecutableCriteria(session); ZJ{+_ax0K
int totalCount = >cU*D:
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((Integer) criteria.setProjection(Projections.rowCount k[^}ld[
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()).uniqueResult()).intValue(); "O"^\f
criteria.setProjection d-K5nRyI
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(null); Yg:74; .
List items = 5y
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criteria.setFirstResult(startIndex).setMaxResults $`+~QR!h
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(pageSize).list(); &*?!*+!,i
PaginationSupport ps = ` wsMybe#
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new PaginationSupport(items, totalCount, pageSize, ?\/dfK:!
[{d[f|
startIndex); -
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return ps; O#89M%
} p-i]l.mT5
}, true); 83O^e&Bt
} Z<m'he
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public List findAllByCriteria(final =kZwB*7
@'G ( k;
DetachedCriteria detachedCriteria){ (B?xq1Q
return(List) getHibernateTemplate ?X5glDZ$
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().execute(new HibernateCallback(){ 13NS*%~7[
publicObject doInHibernate 28ov+s~1+-
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(Session session)throws HibernateException { 4UX]S\X
Criteria criteria = p%YvP
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detachedCriteria.getExecutableCriteria(session); 5qAE9G!c
return criteria.list(); 2H32wpY
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} 9FR1Bruf
}, true); +'6ea+$
} Z_ FL=S\
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public int getCountByCriteria(final iLQt9Hyk
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DetachedCriteria detachedCriteria){ V,*0<7h
Integer count = (Integer) ?@uK s4
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getHibernateTemplate().execute(new HibernateCallback(){ l Ib>t
publicObject doInHibernate ^`PSlT3<F
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(Session session)throws HibernateException { uEi.nSp)S
Criteria criteria = &>^Ympr
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detachedCriteria.getExecutableCriteria(session); :!it7vZ
return +^% &8<
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criteria.setProjection(Projections.rowCount 1)kl
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()).uniqueResult(); H_nOE(i<z
} sp]y! zb"5
}, true); ->#@rF:S
return count.intValue(); UOL%tT
} yl;$#aZB
} JbD)}(G;
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用户在web层构造查询条件detachedCriteria,和可选的 4lo}-@j
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ,IX4Zo"a
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PaginationSupport的实例ps。 LRlk9:QD>
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ps.getItems()得到已分页好的结果集 M#jee E-}%
ps.getIndexes()得到分页索引的数组 q8yJW-GA
ps.getTotalCount()得到总结果数 ,%DAh
ps.getStartIndex()当前分页索引 x6cl(J}
ps.getNextIndex()下一页索引 _(A+_|
ps.getPreviousIndex()上一页索引 B
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 (Y@|h%1W
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 F$.s6Hh.
ENF@6]
一下代码重构了。 )ZT0zIG
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我把原本我的做法也提供出来供大家讨论吧: rQ-z2Pw
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首先,为了实现分页查询,我封装了一个Page类: ?ut juMdl
java代码: .&!{8jBX
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/*Created on 2005-4-14*/ ;;J98G|1
package org.flyware.util.page; -`1L[-<d=/
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/** K`83C`w.
* @author Joa P\4o4MF@K
* TVh7h`Eg
*/ 7^e}|l
publicclass Page { <cc0 phr
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/** imply if the page has previous page */ X#C7r@H
privateboolean hasPrePage; Tk=3"y+u[
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/** imply if the page has next page */ |>V>6%>vK6
privateboolean hasNextPage; J]YN2{(x
PSw+E';
/** the number of every page */ <Q~7a
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privateint everyPage; xa^HU~
q`K-T_<
/** the total page number */ ?{Z0g+B1
privateint totalPage; I%WK*AORM
l\y*wr`
/** the number of current page */ s3%8W==rBW
privateint currentPage; @*{BX~f
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/** the begin index of the records by the current u1Yp5jp^K
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query */ PP`n>v=n
privateint beginIndex; j %0_!*#3
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/** The default constructor */ dNt|"9~&
public Page(){ S.4YC>E
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} &Rt]K
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/** construct the page by everyPage <plR<iI.
* @param everyPage &;3z 1s/
* */ U2?gODh'
public Page(int everyPage){ VO6y9X"
this.everyPage = everyPage; /pN2Jst
} [\F,\
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/** The whole constructor */ P!ICno6[e
public Page(boolean hasPrePage, boolean hasNextPage, . +?lID
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int everyPage, int totalPage, o/
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int currentPage, int beginIndex){ ]V("^.~$+C
this.hasPrePage = hasPrePage; RN|..zml
this.hasNextPage = hasNextPage; VMXXBa&
this.everyPage = everyPage; pa73`Ca]
this.totalPage = totalPage; x)5v8kgf
this.currentPage = currentPage; 3]'z8i({7Y
this.beginIndex = beginIndex; m%\[1|N
} JH;DVPX9z
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/** _Q}z 6+_\
* @return ]}l!L;
* Returns the beginIndex. .e+UgCwi
*/ jU~%5R
publicint getBeginIndex(){ KYW1<Wcp
return beginIndex; Q~{@3<yEI
} F'*&-l
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/** sn#h=,*4`
* @param beginIndex Al]9/ML/m
* The beginIndex to set. Q7%#3ML
*/ 8hp]+k_y
publicvoid setBeginIndex(int beginIndex){ YTh4&wm
this.beginIndex = beginIndex; L?(rv.lb
} Bb`^,?m
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/** [DEw:%
* @return ^w\uOd`
* Returns the currentPage. A6L}5#7-
*/ NR@Tj]`k
publicint getCurrentPage(){ =h;!# ZC
return currentPage; Q(3x"+
} zl?N1>KS
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/** !Esiq<Yh
* @param currentPage dY.uOafr
* The currentPage to set. KJfyh=AD(
*/ {`Z)'G\`
publicvoid setCurrentPage(int currentPage){ NBYE#Uih
this.currentPage = currentPage; B E)l77=/
} t_Wn<)XA
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/** uNg.y$>CX
* @return #!Fs[A5%
* Returns the everyPage. [\yI<^_a
*/ d:''qgz`
publicint getEveryPage(){ =1qkoc~
return everyPage; I:"`|eHxv
} AK =k@hT
@=c='V]
/** <|iU+.j\
* @param everyPage ')V5hKb^
* The everyPage to set. RI;RE/Z
*/ swA"_A8>u
publicvoid setEveryPage(int everyPage){ rl=_ "sd=
this.everyPage = everyPage; ](D [T
} HfiM]^
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/** &i!]
* @return )^+$5OR\c
* Returns the hasNextPage. 0oMMJ6"i
*/ TW0^wSm
publicboolean getHasNextPage(){ KK?~i[aL
return hasNextPage; ffVYlNQ7L
} 3R><AFMY?
(" %yV_R
/** ~/%){t/uLY
* @param hasNextPage oH0\6:S
* The hasNextPage to set. )%7A. UO)
*/ enj2xye%Y
publicvoid setHasNextPage(boolean hasNextPage){ %9.KH
this.hasNextPage = hasNextPage; AF-.Nwp
} RYNzTA
H>]x<#uz)
/** =$Z'F<|d
* @return yw0uF
* Returns the hasPrePage. ?`>yl4
*/
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publicboolean getHasPrePage(){ Me>'QVr
return hasPrePage; @C2<AmY9q*
} E
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<]nI)W(
/** 2srz) xEe
* @param hasPrePage b4wJnmC8
* The hasPrePage to set. 7>LhXC
*/ J:(l&
publicvoid setHasPrePage(boolean hasPrePage){ 67eo~~nUtg
this.hasPrePage = hasPrePage; L"a#Uu8
} 4o8!p\a
C@-JH\{\T#
/** Yy}aQF#M
* @return Returns the totalPage. k*Kq:$9"
* ajAEGD2Zq
*/ 2~)]E#9
publicint getTotalPage(){ ))N^)HR
return totalPage; lI 8"o>-~
} mx yT==E
U PC& O
/** K&*FI (a
* @param totalPage 1jyWP#M#
* The totalPage to set. r4s R5p]|
*/ 8z-Td- R6
publicvoid setTotalPage(int totalPage){ s"/8h#!zv
this.totalPage = totalPage; eD3F%wxz
} A@]
n"
f2=s{0SX0
} F\e'z
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&,/T<V
@'<|B. f
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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 UgP5^3F2
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个PageUtil,负责对Page对象进行构造: -1R~3j1_
java代码: \WTg0b[
tv2dyC&a
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/*Created on 2005-4-14*/ uP$K{ )
package org.flyware.util.page; b<8h\fR#'
"J9+~)e^!
import org.apache.commons.logging.Log; SXL6)pX
import org.apache.commons.logging.LogFactory; pV!(#45 ~W
8yo9$~u;
/** $
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* @author Joa
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* [D)A+
*/ d2Y5'A0X
publicclass PageUtil { ICi- iX
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privatestaticfinal Log logger = LogFactory.getLog NXx}KF c
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(PageUtil.class); TaC)N
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/** =pNkS1ey
* Use the origin page to create a new page r\]WDX!`
* @param page ZUh<2F
* @param totalRecords {1Qwwhov
* @return 4aRYz\yT=
*/ BhKxI
publicstatic Page createPage(Page page, int TuU.yvkU
/vhh2`
totalRecords){ D fb&