Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 'h~IbP
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 5RO6YxQ
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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 sH1ucZ>9Y
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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 /L!
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分页支持类: I7|a,Q^f
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java代码: 3y:),;|5
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package com.javaeye.common.util; F60m]NUM)c
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import java.util.List; K@osD7-
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publicclass PaginationSupport { _XrlCLp: d
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publicfinalstaticint PAGESIZE = 30; +Bt%W%_X
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privateint pageSize = PAGESIZE; Xfg?\j/
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privateList items; *8%uXkM m
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privateint totalCount; f!GFRMM1
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privateint[] indexes = newint[0]; 8zJye6f;l
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privateint startIndex = 0; f|s,%AU"i
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public PaginationSupport(List items, int pMUUF5
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totalCount){ pm= s
setPageSize(PAGESIZE); UK@hnQU8`
setTotalCount(totalCount); EW]8k@&g
setItems(items); =3;!
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setStartIndex(0); `VglE?M
} ?$/W3Xn0%
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public PaginationSupport(List items, int oVfRp.a
({C|(v9C7
totalCount, int startIndex){ iy_3#x5>
setPageSize(PAGESIZE); D42!#
setTotalCount(totalCount); |*]<*qnZt
setItems(items); p8&rl|z|
setStartIndex(startIndex); 6"+bCx0:
} Zjc0R
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public PaginationSupport(List items, int "88<{x L
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totalCount, int pageSize, int startIndex){
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setPageSize(pageSize); jgYe\dinM
setTotalCount(totalCount); F22]4DLHO
setItems(items); H}1XK|K3#H
setStartIndex(startIndex); UM+g8J{$*;
} k>\s6
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publicList getItems(){ (|y@ftr@
return items; `n e9&+
} nqcD#HUv
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publicvoid setItems(List items){ reoCyP\!!
this.items = items; 7V~
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} D r6u0rx8
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publicint getPageSize(){ Nb>C5TjR
return pageSize; hN;$'%^
} Thp!X/2O`
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publicvoid setPageSize(int pageSize){ +/#Lm#*nu%
this.pageSize = pageSize; GM@0$
} ;|Rrtf9
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publicint getTotalCount(){ $*+UX
return totalCount; @CCDe`R*
} [;7$ 'lr%D
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publicvoid setTotalCount(int totalCount){ R&L^+?
if(totalCount > 0){ j5 W)9HW:
this.totalCount = totalCount; {w9GMqq
int count = totalCount / 3 k)P*ME#
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pageSize; >#xIqxV,
if(totalCount % pageSize > 0) ?NUDHUn_
count++; iN+&7#x;/
indexes = newint[count]; 8d>>r69$pa
for(int i = 0; i < count; i++){ Aq &H-g]s
indexes = pageSize * jsw0"d(
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i; qI1JM =
} <\\,L@
}else{ .W0;Vhw"
this.totalCount = 0; 'c/Z
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} {,o =K4CD
} 2&:w_KJ
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publicint[] getIndexes(){ +H3;{ h9,
return indexes; !O/(._YB`
} %4h$/~
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publicvoid setIndexes(int[] indexes){ <cR]-Yr~
this.indexes = indexes; ,N2|P:x
} >iWw
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publicint getStartIndex(){ CDRz3Hu U
return startIndex; h%%dRi
} ^36m$J $
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publicvoid setStartIndex(int startIndex){ ,Je9]XT
if(totalCount <= 0) tc)4$"9)
this.startIndex = 0; ?\T):o;/
elseif(startIndex >= totalCount) ?h|w7/9
this.startIndex = indexes gn4Sz")
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[indexes.length - 1]; VaFv%%w
elseif(startIndex < 0) H=>;Mj
this.startIndex = 0; Xx=c'j<
else{ !>QD42
this.startIndex = indexes X!/
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[startIndex / pageSize]; /m+\oZ
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} WB>M7MI%
} N:7;c}~
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publicint getNextIndex(){ dIRSgJ`
int nextIndex = getStartIndex() + xrCb29{
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pageSize; H{fOAv1*
if(nextIndex >= totalCount) W*NK-F[
return getStartIndex(); 8>~\R=SC
else JnZlz?}^
return nextIndex; :k7h"w
} |H@1g=q
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publicint getPreviousIndex(){ hG%J:}
int previousIndex = getStartIndex() - d^YM@>%
N'e3<
pageSize; Cdbh7
if(previousIndex < 0) #~>ykuq
return0; KZt4 dr
else }6^d/nE*T
return previousIndex; Oxhc!9F
} dQH9NsV7g
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} J+20]jI
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抽象业务类 xr'gi(.o
java代码: DAt Zp%
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/** ]2o? Gnn@
* Created on 2005-7-12 lQnqPQY
*/ B&k"B?9mL
package com.javaeye.common.business; &KZr`"cT#
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import java.io.Serializable; dAj;g9N/h
import java.util.List; C@Fk
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import org.hibernate.Criteria; &^!vi2$5}
import org.hibernate.HibernateException; q+/7v9
import org.hibernate.Session; [qGj*`@C
import org.hibernate.criterion.DetachedCriteria; 982n G-"
import org.hibernate.criterion.Projections; R#i{eE*WF
import 4!
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f)/5%W7n}
org.springframework.orm.hibernate3.HibernateCallback; =]yzy:~ey
import 'WLh
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org.springframework.orm.hibernate3.support.HibernateDaoS EvEI5/z
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upport; mU3 @|a/@0
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import com.javaeye.common.util.PaginationSupport; LU7d\Ch
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public abstract class AbstractManager extends \ZPmPu9^(
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HibernateDaoSupport { i[d@qp!H=
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privateboolean cacheQueries = false; BLskUrPF
@z!|HLD+
privateString queryCacheRegion; 2En^su$
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publicvoid setCacheQueries(boolean ZdjmZx%%
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cacheQueries){ wN4N2
this.cacheQueries = cacheQueries; LmQS;/:
} Sx", Zb
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publicvoid setQueryCacheRegion(String >SR!*3$5
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queryCacheRegion){
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this.queryCacheRegion = >
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queryCacheRegion; jRCG}'
} AvS<b3EoN
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publicvoid save(finalObject entity){ }pzUHl>
getHibernateTemplate().save(entity); =5jng.
} k;bdzcMkQ
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publicvoid persist(finalObject entity){ |6d0,muN
getHibernateTemplate().save(entity); CtO `t5
} w`")^KXi
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publicvoid update(finalObject entity){ @d]a#ypU
getHibernateTemplate().update(entity); >w~Hq9
} nA#FGfZ{Ge
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publicvoid delete(finalObject entity){ ~jDG&L
getHibernateTemplate().delete(entity); `X06JTqf:
} ~ojH$=K>d
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publicObject load(finalClass entity, :QV-!
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finalSerializable id){ ta\CZp
return getHibernateTemplate().load ~T_4M
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(entity, id); Jbrjt/OG#I
} p*_^JU(<p
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publicObject get(finalClass entity, a2MFZe
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finalSerializable id){ 9Rg|o CP_
return getHibernateTemplate().get @6N$!Q?
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(entity, id); .(7end<
} G2A^+R0\
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publicList findAll(finalClass entity){ mjwh40x.o
return getHibernateTemplate().find("from O"D0+BK79e
<^APq8>
" + entity.getName()); A+:X
} kDz!v?Z2+B
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publicList findByNamedQuery(finalString Gidh7x
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namedQuery){ nF8|*}w
return getHibernateTemplate 8 )W{C>
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().findByNamedQuery(namedQuery); Y30e7d* qr
} E9]/sFA-]
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publicList findByNamedQuery(finalString query, "5+x6/9b
q
(?%$u.
finalObject parameter){ 0KQDw
return getHibernateTemplate 8hK\Ya:mP
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().findByNamedQuery(query, parameter); +~6Nq(kV
} 1m52vQSo3l
jgfl|;I?pg
publicList findByNamedQuery(finalString query, w*E0f?s
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finalObject[] parameters){ nsRZy0@$t
return getHibernateTemplate 'k?%39
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().findByNamedQuery(query, parameters); %SHjJCS3
} yt+"\d
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publicList find(finalString query){ 7 fE
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return getHibernateTemplate().find 23F<f+2S
01 vEt
(query); J(%Jg
} B-@ ]+W
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publicList find(finalString query, finalObject ubpVrvu@
k|Hxd^^I
parameter){ \sUk71L`j
return getHibernateTemplate().find u;[*Z
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(query, parameter); mr`Lxy9e
} x2^Yvgc-
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public PaginationSupport findPageByCriteria 3(Y#*f|
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(final DetachedCriteria detachedCriteria){ C1/<t)^
return findPageByCriteria xS4B"/
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 9q##)
} !zd]6YL$
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public PaginationSupport findPageByCriteria W'
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C
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(final DetachedCriteria detachedCriteria, finalint J^Dkx"1GD
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startIndex){ tAPr4n!
return findPageByCriteria (&=<UGY(w
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(detachedCriteria, PaginationSupport.PAGESIZE, ?f\;z<e|
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startIndex); Qj?qWVapA
} -FAAP&LG
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public PaginationSupport findPageByCriteria 0X`sQNx
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(final DetachedCriteria detachedCriteria, finalint "kE$2Kg
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pageSize, n^svRM]eQ
finalint startIndex){ 8IAf9
return(PaginationSupport) 5pOb;ry")`
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getHibernateTemplate().execute(new HibernateCallback(){ k63]Qf=5?N
publicObject doInHibernate AI$r^t1
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(Session session)throws HibernateException { Hcp)Q76X
Criteria criteria = F~NmLm
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detachedCriteria.getExecutableCriteria(session); @_gCGI>Q
int totalCount = >O{U4_j@(
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((Integer) criteria.setProjection(Projections.rowCount i|z=q
'8auj
()).uniqueResult()).intValue(); <.DFa/G
criteria.setProjection kl0!*j
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(null); l17sJ! I
List items = <Ae1YHUY
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criteria.setFirstResult(startIndex).setMaxResults MH"{N
"|
$\W|{u`
(pageSize).list(); #E[{
PaginationSupport ps = 6D[m}/?Uy
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new PaginationSupport(items, totalCount, pageSize, X=:|v<E
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startIndex); -,M*j|
return ps; M^i^_}~S;
} _I("k:E7
}, true); 52*9q!
} EJd l%j
` ^rN"\
public List findAllByCriteria(final X1A~#w>
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DetachedCriteria detachedCriteria){ NTnjVU
}
return(List) getHibernateTemplate Km5#$IiP;
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().execute(new HibernateCallback(){ *5SOXrvhu6
publicObject doInHibernate N36<EHq
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(Session session)throws HibernateException { ^-s'Ad3
Criteria criteria = I:6N?lD4}0
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detachedCriteria.getExecutableCriteria(session);
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return criteria.list(); FME&vUh/
} .
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}, true); eXHk6[%[
} +=XDNSw
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public int getCountByCriteria(final P/BWFN1
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DetachedCriteria detachedCriteria){ _[yBwh
Integer count = (Integer) (+@
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getHibernateTemplate().execute(new HibernateCallback(){ &P+7Um(
publicObject doInHibernate E%R^
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(Session session)throws HibernateException { <<43'N+
Criteria criteria = nqG9$!k^t
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detachedCriteria.getExecutableCriteria(session); #=tWjInm
return &3
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criteria.setProjection(Projections.rowCount F9hh- "(Z
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()).uniqueResult(); n:hHm,
} a?LrSk`
}, true); byj}36LN62
return count.intValue(); K`=O!;
} VDCG
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} *
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用户在web层构造查询条件detachedCriteria,和可选的 8>Y
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 8.-0_C*U;
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PaginationSupport的实例ps。 pYtG%<
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ps.getItems()得到已分页好的结果集 _l?InNv
ps.getIndexes()得到分页索引的数组 -WDU~VSU
ps.getTotalCount()得到总结果数 ]7qn&(]
ps.getStartIndex()当前分页索引 SZO$#
ps.getNextIndex()下一页索引 8MHYk>O~{G
ps.getPreviousIndex()上一页索引 tx$kD2
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 3F5Y#[L`
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 _[zZm*
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一下代码重构了。 hT`kma
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我把原本我的做法也提供出来供大家讨论吧: `1|#Za~e
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首先,为了实现分页查询,我封装了一个Page类: VR86ok
java代码: pmm?Fq!s=
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/*Created on 2005-4-14*/ 4uQ\JD(*Eu
package org.flyware.util.page; en"]u,!
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/** (@t O1g
* @author Joa _zAHN0d
* R+'$V$g\X
*/ w! J|KM
publicclass Page { ET]PF ,`
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/** imply if the page has previous page */ )
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privateboolean hasPrePage; Vu
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/** imply if the page has next page */ VrV
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privateboolean hasNextPage; -^ )0c
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/** the number of every page */ RrFq"
privateint everyPage; Rne#z2Ok
D?+\"lI
/** the total page number */ ~SI`%^L
privateint totalPage; $uw[X
DtXQLL*fl(
/** the number of current page */ $;kFuJF
privateint currentPage; fkLI$Cl
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/** the begin index of the records by the current K U 2LJ_~Y
)?5027^
query */ D{-h2=V
privateint beginIndex; "4Joou"U
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/** The default constructor */ U3Fa.bC6}
public Page(){ vrRbUwL!
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} j-l#n&M
#xUX1(
/** construct the page by everyPage L1'PQV
* @param everyPage ;^XF;zpg
* */ 12 8aJ
public Page(int everyPage){ H1?t2\V4
this.everyPage = everyPage; [v@3|@
} SM57bN
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/** The whole constructor */ 8Zj=:;
public Page(boolean hasPrePage, boolean hasNextPage, N>R\,n|I
3.i$lp`t
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int everyPage, int totalPage, eAU0 8gM.
int currentPage, int beginIndex){ to2;. ~X
this.hasPrePage = hasPrePage; r]h>Bb
this.hasNextPage = hasNextPage; 1M1|Wp
this.everyPage = everyPage; `IP?w&k)
this.totalPage = totalPage; iA~LH6
this.currentPage = currentPage; e"Y ( 7<
this.beginIndex = beginIndex; :;Lt~:0b~
} CbvP1*1
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/** l#%qF Db
* @return \9HpbCHr
* Returns the beginIndex. :G.u{cw
*/ @nC][gNv
publicint getBeginIndex(){ b 7XTOB_HO
return beginIndex; WqX$;'}h
} mu#IF'|b
0+-"9pED>E
/** 1c5+XCr
* @param beginIndex ae%Bl[
* The beginIndex to set. ?;GbK2\bj
*/ .<m${yU{3
publicvoid setBeginIndex(int beginIndex){ GHs,,J;
this.beginIndex = beginIndex; !.2tv
} =3h?!$#?
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/** C VXz>oM
* @return %bN+Y'
* Returns the currentPage. :d AC:h
*/ }3825
publicint getCurrentPage(){ |wxAdPe
return currentPage; DpRGPs
} 5T*Uq>x0
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/** 3_DwqZ 'O
* @param currentPage 8O[br@h:5
* The currentPage to set. 1>c^-"#e^
*/ #QUQC2P(~
publicvoid setCurrentPage(int currentPage){ #&k`-@b5|
this.currentPage = currentPage; 539fB,
} jv;8Mm
7@W}>gnf
/** Io;x~i09K
* @return <)qJI'u|
* Returns the everyPage. ?&`PN<~2z
*/ MyZ5~jnr\
publicint getEveryPage(){ &GfDo4$
return everyPage; N9dx^+\
} `{oFdvL~)
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/** &Z3u(Eb
* @param everyPage =x
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* The everyPage to set. [ML|,kq!
*/ ;aj4V<@
publicvoid setEveryPage(int everyPage){ .OM^@V~T
this.everyPage = everyPage; op2<~v0?
} 3(oB[9]s
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/** @<TC+M5!
* @return M?S&@\}c
* Returns the hasNextPage. nk*T
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*/ kEYkd@{
publicboolean getHasNextPage(){ n8+_Uww
return hasNextPage; /;X+<Wj
} ,q K'!
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/** A{ a4;`}5
* @param hasNextPage .)g7s? K
* The hasNextPage to set. @oNYMQ@)d
*/ T5_/*`F
publicvoid setHasNextPage(boolean hasNextPage){ mgd)wZNV
this.hasNextPage = hasNextPage; Z1~`S!(}
} _'mK=`>u
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/** R:5uZAx
* @return 1F'x$~ZI
* Returns the hasPrePage. 8C=8Wjm
*/ gq7l>vT.
publicboolean getHasPrePage(){ HhZ>/5'(
return hasPrePage; g=na3^PL6
} (|2:^T+
oWLv-{08
/** Z#t}yC%^d
* @param hasPrePage o.g)[$M8cF
* The hasPrePage to set. Mp3nR5@d$
*/ =c;.cW
publicvoid setHasPrePage(boolean hasPrePage){ 8b[<:{[YB
this.hasPrePage = hasPrePage; grxlGS~Q
} sTu]C +A
YXLZ2-%ohZ
/** Vv&GyqoO]
* @return Returns the totalPage.
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* 0K(&EpVE
*/ w }=LC#le
publicint getTotalPage(){ pf`vH`r
return totalPage; XS(Q)\"
} Rn $TYCO
I]-"Tw
/** l+#uQo6cqQ
* @param totalPage STL+tLJ
* The totalPage to set. GUps\:ss
*/ veAdk9
publicvoid setTotalPage(int totalPage){ E h+m|A
this.totalPage = totalPage; [{q])P;
} zi_0*znw
{U)q)
} yIu_DFq%
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f;%=S:3
C/!7E:
'j\~> a3\
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 bo-lT-I
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个PageUtil,负责对Page对象进行构造: `hDH7u!U.
java代码: YJF|J2u
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/*Created on 2005-4-14*/ ,R}9n@JI^Y
package org.flyware.util.page; ncpNesB
wz{&0-md*'
import org.apache.commons.logging.Log; S@@#L
import org.apache.commons.logging.LogFactory; UE-1p
N (0%C?
/** Y?V.O
* @author Joa X- j@#Qb
* Z_4|L+i<{
*/ &3|l4R\
publicclass PageUtil { (z:qj/|
wln"g,ct
privatestaticfinal Log logger = LogFactory.getLog 1b<[/g9
t+#vcg,G
(PageUtil.class); b/d1(B@
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/** w7~cY=
* Use the origin page to create a new page 'F^1)Ga$
* @param page =C-
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* @param totalRecords 0D/7X9xg9+
* @return g~XR#vl$
*/ AEd9H
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publicstatic Page createPage(Page page, int 9z+ZFIf7d
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totalRecords){ +t8#rT ^B
return createPage(page.getEveryPage(), A3.*d:A
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page.getCurrentPage(), totalRecords); O jH"qi
} s;#,c(
S])*LUi
/** t{e}3}LEd
* the basic page utils not including exception 6GoQJ
0py29>"t
handler ))6YOc
* @param everyPage 0lU
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* @param currentPage N_E)f
* @param totalRecords T%yGSk
* @return page L]E.TvM1*
*/ oxug
publicstatic Page createPage(int everyPage, int L|p+;ex
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currentPage, int totalRecords){ Bo;{ QoB
everyPage = getEveryPage(everyPage);
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currentPage = getCurrentPage(currentPage); ,+v>(h>q
int beginIndex = getBeginIndex(everyPage, ^;[^L=}8$
825 QS`
currentPage); gkDXt^Ob
int totalPage = getTotalPage(everyPage, rQ(u@u;
Yv3P]6c.
totalRecords); $ve*j=p
boolean hasNextPage = hasNextPage(currentPage, ft$!u-`
A]MX^eY
totalPage); M4e8PRlI
boolean hasPrePage = hasPrePage(currentPage); sj&1I.@,>
0*]ZC'pm
returnnew Page(hasPrePage, hasNextPage, G_#MXFWt
everyPage, totalPage, a&Me#H{
currentPage, }[y_Fr0
l)f 2T@bHl
beginIndex); T2 TWb
} jxZ_-1
}Vfc;2
privatestaticint getEveryPage(int everyPage){ @xr}(.
return everyPage == 0 ? 10 : everyPage; jP.dQj^j&
} G[]h1f!
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privatestaticint getCurrentPage(int currentPage){ K@?K4o
return currentPage == 0 ? 1 : currentPage; {a,U{YJ\H
} 1aezlDc*
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privatestaticint getBeginIndex(int everyPage, int v7<r-<I[
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currentPage){ g6@^n$Y
return(currentPage - 1) * everyPage; UYGO|lkEU
} y24/lc
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privatestaticint getTotalPage(int everyPage, int .SDE6nvbW
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totalRecords){ (d['f]S+&
int totalPage = 0; Wu)An
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