Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 zzx4;C",u
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Y}[r`}={
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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 FUOvH85f
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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 [n^___7
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分页支持类: \:#b9t{B-
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java代码: '-~86Q
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package com.javaeye.common.util; <zUmcZ
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import java.util.List; Zsuh 8t
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publicclass PaginationSupport { 'nLv0.7*
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publicfinalstaticint PAGESIZE = 30; jBQQ?cA
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privateint pageSize = PAGESIZE; q\/|nZO4
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privateList items; 4 I~,B[|
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privateint totalCount; WU\):n
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privateint[] indexes = newint[0]; S%4hv*_c
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privateint startIndex = 0; [|>.iH X
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public PaginationSupport(List items, int xtnB:3
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totalCount){ *83+!DV|
setPageSize(PAGESIZE); 7+fik0F
setTotalCount(totalCount); ,yT4(cMBk?
setItems(items); +g;G*EP7*
setStartIndex(0); 5_O.p3$tV
} }I;W
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public PaginationSupport(List items, int vrbS-Z<S9
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totalCount, int startIndex){ vJ{\67tK
setPageSize(PAGESIZE); H;CGLis
setTotalCount(totalCount); } 6KL
setItems(items); 6xOR,p>E
setStartIndex(startIndex); `?$R_uFh:
} -R8RAwsLG
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public PaginationSupport(List items, int Zf"AqGP
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totalCount, int pageSize, int startIndex){ {P]l{W@li
setPageSize(pageSize); olJ9Kfc0
setTotalCount(totalCount); $W2g2[+
setItems(items); j`
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setStartIndex(startIndex); <)}*S
} g7H;d
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publicList getItems(){ w_-{$8|
return items; :{fsfZXXr
} q4Z\y
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publicvoid setItems(List items){ !1l2KW<be
this.items = items; dfrq8n]
} }l/md/C0
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publicint getPageSize(){ 0Icyi#N
return pageSize; >Kr,(8rA
} XI0O^[/n{
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publicvoid setPageSize(int pageSize){ mA4v 4z
this.pageSize = pageSize; 4j | vzyc
} "<&F=gV
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publicint getTotalCount(){ a@7we=!
return totalCount; R_*\?^k|A
} "L,FUo^&
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publicvoid setTotalCount(int totalCount){ $a-~ozr`C
if(totalCount > 0){ `KL`^UqR
this.totalCount = totalCount; $v^F>*I1
int count = totalCount / D( _aXy
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pageSize; ^fx9R5E$:
if(totalCount % pageSize > 0) E`X+fJx
count++; EfyF]cYL
indexes = newint[count]; dRu@5
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for(int i = 0; i < count; i++){ NLdUe32A
indexes = pageSize * _
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} fLys$*^)^
}else{ $0wl=S
this.totalCount = 0; KomF)KQ2r
} )jH"6my_
} Zj},VB*T
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publicint[] getIndexes(){ "NJ!A
return indexes; GJW1|Fk
} E:i3
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publicvoid setIndexes(int[] indexes){ ^C'k.pV
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this.indexes = indexes; 4Q]+tXes
} "_(o% \"7
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publicint getStartIndex(){ QQ?` 1W
return startIndex; 8kqxr&,[
} *</;:?
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publicvoid setStartIndex(int startIndex){ /fD)/x
if(totalCount <= 0) r)b`3=
this.startIndex = 0; nyMA%9,B
elseif(startIndex >= totalCount) :n>h[{o%
this.startIndex = indexes ! g}9xIL
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[indexes.length - 1]; KN%Xp/lkX
elseif(startIndex < 0) Q0r_+0[7j
this.startIndex = 0; <}UqtDF 0
else{ NZD
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this.startIndex = indexes [pOU!9v4
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[startIndex / pageSize]; C ]#R7G
} ];< [Cln%
} E7*]t_p"
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publicint getNextIndex(){ `*~:nvU
int nextIndex = getStartIndex() + B4{A(-Tc
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pageSize; N),Zb^~nw
if(nextIndex >= totalCount) Bz24U wcZ
return getStartIndex(); N.VzA
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else un\"1RdO
return nextIndex; MBa/-fD
} ,{.&xJ$
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publicint getPreviousIndex(){ R{*p\;
int previousIndex = getStartIndex() - SQliF[-
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pageSize; sd=i!r)ya
if(previousIndex < 0) gz$=\=%>RL
return0; nGP>M#F
else *{tJ3<t(1
return previousIndex; Jw86P=
} v=/V<3
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} `yxk
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抽象业务类 EKDv3aFQZ#
java代码: _o`'b80;
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/** Y[pGaiN:
* Created on 2005-7-12 lk+)-J-lj'
*/ 2
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package com.javaeye.common.business; TX 12$p\
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import java.io.Serializable; K J~f ~2;
import java.util.List; m6JIq}CMb
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import org.hibernate.Criteria; ]zD/W%c
import org.hibernate.HibernateException; 2Gx&ECa,
import org.hibernate.Session; )~WxNn3rx
import org.hibernate.criterion.DetachedCriteria; 6)H70VPJ
import org.hibernate.criterion.Projections; ZL@7Mr!e
import P+]39p{
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org.springframework.orm.hibernate3.HibernateCallback; 3L#KHTM
import fE M8/bhq
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org.springframework.orm.hibernate3.support.HibernateDaoS s=28.
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upport; ku\_M
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import com.javaeye.common.util.PaginationSupport; m-;u]X=a
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public abstract class AbstractManager extends B_:K.]DK`
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HibernateDaoSupport { )L^WD$"'Q
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privateboolean cacheQueries = false; c?[A
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privateString queryCacheRegion; -V<i4X<|,+
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publicvoid setCacheQueries(boolean PN<Y&/fB
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cacheQueries){ "bC8/^
this.cacheQueries = cacheQueries; +-xA/nU.c
} |QXW$
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publicvoid setQueryCacheRegion(String e}aD<EG
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queryCacheRegion){ -O -_F6p'D
this.queryCacheRegion = pNE!waR>
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queryCacheRegion; t t#M4n@
} AvhmN5O=
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publicvoid save(finalObject entity){ )|\72Z~eq
getHibernateTemplate().save(entity); 1jQz%^~
} >b<br
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publicvoid persist(finalObject entity){ \@gs8K#
getHibernateTemplate().save(entity); Le#bitp
} 4uDz=B+8y
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publicvoid update(finalObject entity){ +5 @8't
getHibernateTemplate().update(entity); YdIV_&-W
} Ujb||(W
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publicvoid delete(finalObject entity){ dht1I`i"B
getHibernateTemplate().delete(entity); G8eAj%88
} %vn rLt$
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publicObject load(finalClass entity, Qz[~{-<
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finalSerializable id){ Gz$DsaG
return getHibernateTemplate().load e6#^4Y/+`
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(entity, id); SIzW3y[
} Q!|. ,?V
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publicObject get(finalClass entity, 8`9!ocrM
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finalSerializable id){ 0;r+E*`DA
return getHibernateTemplate().get q<.^DO~$L
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(entity, id); ]D%D:>9|/
} GfPe0&h
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publicList findAll(finalClass entity){ !j(v-pQf"
return getHibernateTemplate().find("from ATH0n>)
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" + entity.getName()); =-`X61];M
} x-(?^g
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publicList findByNamedQuery(finalString =`Nnd@3v
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namedQuery){ {#0B~Zr
return getHibernateTemplate bG;vl;C
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().findByNamedQuery(namedQuery); *cq#>rN
} A&)P_B1|
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publicList findByNamedQuery(finalString query, "EQ}xj
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finalObject parameter){ b{(!Ls_ &
return getHibernateTemplate &3S;5{7_e
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().findByNamedQuery(query, parameter); ^4c2}>f
} uA*Op45
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publicList findByNamedQuery(finalString query, SL>>]A,E<`
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finalObject[] parameters){ >LwAG:Ud
return getHibernateTemplate =KMd! $J\
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().findByNamedQuery(query, parameters); .ikFqZ$$
} VOp8 ,!
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publicList find(finalString query){ HC+(FymV
return getHibernateTemplate().find %pe7[/
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(query); ]'DtuT?Z
} Eki7bT@/
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publicList find(finalString query, finalObject nRb#M
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parameter){ :q0C$xF
return getHibernateTemplate().find Hg*6I%D[So
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(query, parameter); akrEZ7A
} L}lc=\
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public PaginationSupport findPageByCriteria OfbM]:}<3
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(final DetachedCriteria detachedCriteria){ qf(!3
return findPageByCriteria >eW HPO
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); D@7\Fg
} {SCwi;m
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public PaginationSupport findPageByCriteria yngSD`b_P
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(final DetachedCriteria detachedCriteria, finalint /8Ca8Ju
)u(`s `zd
startIndex){ |JnJ=@-y
return findPageByCriteria i*nNu-g
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(detachedCriteria, PaginationSupport.PAGESIZE, I>C;$Lp]
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startIndex); ;,'eO i
} NcB^qv
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public PaginationSupport findPageByCriteria }#a d
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(final DetachedCriteria detachedCriteria, finalint !pQQkZol
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pageSize, `~VV1
finalint startIndex){ u=p([
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return(PaginationSupport) )LKutN?tBy
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getHibernateTemplate().execute(new HibernateCallback(){ Ycn*aR2
publicObject doInHibernate 5 ,q uM"
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(Session session)throws HibernateException { bTb|@
Criteria criteria = ~eA7:dZLb
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detachedCriteria.getExecutableCriteria(session); SHIK=&\~-
int totalCount = vRVQ:fw
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((Integer) criteria.setProjection(Projections.rowCount _ ?xORzO
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()).uniqueResult()).intValue(); P!0uAkt9C
criteria.setProjection >#)^4-e
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(null); "tn]s>iAd=
List items = p*8=($j4
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criteria.setFirstResult(startIndex).setMaxResults d+\o>x|Y!Y
)xoI H{
(pageSize).list(); .Q>.|mu
PaginationSupport ps = K\,)9:`t
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new PaginationSupport(items, totalCount, pageSize, L^Fni~
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startIndex); p>Qzz`@e
return ps; {M )Y6\v
} #||^l_
}, true); B#OnooJI
} P>9F(#u_(F
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public List findAllByCriteria(final ;w a-\Z
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DetachedCriteria detachedCriteria){ 9i;%(b{
return(List) getHibernateTemplate RpOGY{[)[
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().execute(new HibernateCallback(){ $^?Mip
publicObject doInHibernate N^*%{[<5
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(Session session)throws HibernateException { '=Nb`n3%
Criteria criteria = |A0BYzlVc
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detachedCriteria.getExecutableCriteria(session); KLBU8%
return criteria.list(); #^|y0:
} NTbmI$(
}, true); m(i8 4~
} .!e):&(8
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public int getCountByCriteria(final BiT
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DetachedCriteria detachedCriteria){ Z-z^0QO
Integer count = (Integer) bA!n;
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getHibernateTemplate().execute(new HibernateCallback(){ ?<)4_
publicObject doInHibernate d,8L-pT$FM
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(Session session)throws HibernateException { LeRyS]
Criteria criteria = /Jj7+?
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detachedCriteria.getExecutableCriteria(session); 9:
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return v3PtiKS
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criteria.setProjection(Projections.rowCount nWb*u
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()).uniqueResult(); 17P5Dr&
} FnxPM`Zx
}, true); P1C{G'cR
return count.intValue(); 7+
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} PkX4 !
} QTr)r;Tro
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用户在web层构造查询条件detachedCriteria,和可选的 corNw+|/w
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 WbJ|]}hJ\
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PaginationSupport的实例ps。 )XCG4-1
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ps.getItems()得到已分页好的结果集 n8 UG{.
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ps.getIndexes()得到分页索引的数组 oZ,J{I!L
ps.getTotalCount()得到总结果数 W(5XcP(
ps.getStartIndex()当前分页索引 /cHUqn30a
ps.getNextIndex()下一页索引 |\.:h":!0~
ps.getPreviousIndex()上一页索引 w#6)XR|+,.
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 8k{KnH
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 G&Fe2&5!w
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一下代码重构了。 1.0:
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我把原本我的做法也提供出来供大家讨论吧: =jEVHIYt
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首先,为了实现分页查询,我封装了一个Page类: *{:Zdg'~E
java代码: ^(kmF UV,Z
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/*Created on 2005-4-14*/ q nb#~=x^
package org.flyware.util.page; "D,}|
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/** #V{!|Y '
* @author Joa iE0x7x P_
* redMlHM
*/ IM$ d~C
publicclass Page { \G0YLV~>P
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/** imply if the page has previous page */ M3U?\g
privateboolean hasPrePage; kyi"U A82
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/** imply if the page has next page */ ::p%R@?
privateboolean hasNextPage; s
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/** the number of every page */ *ESi~7;#
privateint everyPage; X2|&\G9c
@;G%7&ps
/** the total page number */ u4tv=+jh
privateint totalPage; cOf.z)kf6
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/** the number of current page */ -FF#+Z$
privateint currentPage; "8p<NsU
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/** the begin index of the records by the current ]eUD3WUe>q
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*U[
query */ 2#
privateint beginIndex; j0^1BVcj
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/** The default constructor */ ;VzdlCZ@
public Page(){ m
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} &_q8F,I \<
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/** construct the page by everyPage <*I*#WI&B
* @param everyPage O2":)zU.
* */ i= R%MH+
public Page(int everyPage){ %ikPz~(
this.everyPage = everyPage; ;?q-]J?
} 3&I3ViAH
a ]:xsJ~
/** The whole constructor */ SQ*%d.1
public Page(boolean hasPrePage, boolean hasNextPage, Y[|9
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int everyPage, int totalPage, DJ0jtv6nQ-
int currentPage, int beginIndex){ x:i,l:x
this.hasPrePage = hasPrePage; +xAD;A4
this.hasNextPage = hasNextPage; G5|'uKz2"
this.everyPage = everyPage; aTfc>A;
this.totalPage = totalPage; @HTs.4
this.currentPage = currentPage; vTo+jQs^
this.beginIndex = beginIndex; A#{I-*D[
} -aLM*nIoe
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/** ]N,'3`&::
* @return Q@|"xKa
* Returns the beginIndex. o6RT 4`
*/ nVr V6w
publicint getBeginIndex(){ A~v[6*~>
return beginIndex; Bp5%&T k
} @=}NMoNH
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/** I %sw(uoE
* @param beginIndex }8ESp3~e_
* The beginIndex to set. 2"k|IHs1
*/ m<LzgX
publicvoid setBeginIndex(int beginIndex){ ]T(qk
this.beginIndex = beginIndex; aO}p"-'
} +K8T%GAr
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/** C?MKbD=K
* @return \II^&xSF
* Returns the currentPage. +3M1^:
*/ Y]
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publicint getCurrentPage(){ @\:@_}Z`_}
return currentPage; *3h_'3yo@
} yRDtPK"E-
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/** l^%52m@{
* @param currentPage J0YNzC4
* The currentPage to set. .Wi%V"
*/ >L8 &6aU
publicvoid setCurrentPage(int currentPage){ 0+)1KU)I
this.currentPage = currentPage; hD7vjg&Z
} -<AGCiLz
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/** ++ 5!8Nv
* @return a1ps'^Qhh
* Returns the everyPage. xX0wn?,~
*/ n
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publicint getEveryPage(){ GuaF B[4
return everyPage; DGw*BN%`
} 5|`./+Ghk
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/** }7K~-
* @param everyPage <u1`o`|-
* The everyPage to set. \IEuu^
*/ V}~',o<m
publicvoid setEveryPage(int everyPage){ e2>AL
this.everyPage = everyPage; '#oH1$W]
} \/nSRAk
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/** dDAl n+
* @return ccx0aC3@I
* Returns the hasNextPage. +D[C.is>]}
*/ (^_INy*
publicboolean getHasNextPage(){ obv_?i1
return hasNextPage; w'y,$gtX/
} W59 xe&l
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/** 8wEJyAu2
* @param hasNextPage T[ g(S0dz
* The hasNextPage to set. i[z#5;x+<
*/ !t{
publicvoid setHasNextPage(boolean hasNextPage){ ,w=u?
this.hasNextPage = hasNextPage; y@AUSh;
} `D$RL*C;M`
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/** I*g[Y=
* @return ?iamo.0zN
* Returns the hasPrePage. 6(Ntt
*/ ZsYY)<n
publicboolean getHasPrePage(){ ER}5`*X{
return hasPrePage; ;RQ}OCz9}8
} x cZF_elt7
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R
/** n;:C{5
* @param hasPrePage Ysw&J}6e
* The hasPrePage to set. "5EL+z3v
*/ # $'H?lO
publicvoid setHasPrePage(boolean hasPrePage){ TQ%F\@"
this.hasPrePage = hasPrePage; :KGPQ@:O
} A ^zd:h-
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/** EN8xn9M?
* @return Returns the totalPage. Ka%#RNW
* >McEuoZx9
*/ ?N@[R];
publicint getTotalPage(){ YTr+"\CkA
return totalPage; [81q 0@
} m9-=Y{&/
h}DKFrHW;-
/** UA*Kuad
* @param totalPage Q|U
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* The totalPage to set. .*J /F$
*/ 1?Tj
publicvoid setTotalPage(int totalPage){ 7?);wh 7`
this.totalPage = totalPage; 7mtg
} :YLurng/]
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