Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 cOZ^huK
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 T:">,*|
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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 GKhwn&qCKb
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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 -!>ZATL<B
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分页支持类: i{ @'\}{L
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java代码: /7@2Qc2
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package com.javaeye.common.util; VQ<i$ I
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import java.util.List; k3[h'.ps
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publicclass PaginationSupport { w
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publicfinalstaticint PAGESIZE = 30; %Dls36F
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privateint pageSize = PAGESIZE; "ue$DyN
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privateList items; <lmJa#
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privateint totalCount; {dx /p-Tv
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privateint[] indexes = newint[0]; *.]E+MYi*
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privateint startIndex = 0; 6a?$=y
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public PaginationSupport(List items, int eQVPxt2N
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totalCount){ "E|r 3cN
setPageSize(PAGESIZE); Ru^ ONw"
setTotalCount(totalCount); lhA
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setItems(items); L sDzV)
setStartIndex(0); QcG5PV
} EhPVK6@
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public PaginationSupport(List items, int QiE<[QP{g
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totalCount, int startIndex){ x~9z`d{!
setPageSize(PAGESIZE); Ipz
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setTotalCount(totalCount); d6@jEa-
setItems(items); #O9*$eMw
setStartIndex(startIndex); k\c &2T]W
} +#uNQ`1v
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public PaginationSupport(List items, int +:]Aqyc\
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totalCount, int pageSize, int startIndex){ '<&EPUO
setPageSize(pageSize); -)OkG#J@
setTotalCount(totalCount); B.mbKntK)R
setItems(items); ]6BmCh
setStartIndex(startIndex); *Qg5Z
} &:;;u\
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publicList getItems(){ .p(6' TYnI
return items; Q_kT}6#(J=
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publicvoid setItems(List items){ _:gGD8
this.items = items; : \:~y9X0
} Wz-3?EQ
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publicint getPageSize(){ B221}t
return pageSize; |)?aH2IL
} KZ!N{.Jk
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publicvoid setPageSize(int pageSize){ -Y8ks7
this.pageSize = pageSize; rO(TG
} T018)WrhL
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publicint getTotalCount(){ ,%?; \?b%h
return totalCount; WS1&3mOd
} >' ksXA4b
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publicvoid setTotalCount(int totalCount){ ! 2Xr~u7a
if(totalCount > 0){ rv,NQZ
this.totalCount = totalCount; 6MQs \ J6.
int count = totalCount / 1<W4>~,wj
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pageSize; 5BU%%fBJ.
if(totalCount % pageSize > 0) Ig02M_
count++; }$Hs;4|
indexes = newint[count]; GX7 eRqz >
for(int i = 0; i < count; i++){ x&R9${e%
indexes = pageSize * (ET ;LH3
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} '9-axIj70
}else{ s%N`
this.totalCount = 0; Mhv1K|4s
} }fJ:wku
} rnn2u+OG
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publicint[] getIndexes(){ ]27>a"p59Y
return indexes; FJa[ToZ4+
} U]V3DDN
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publicvoid setIndexes(int[] indexes){ 8h&oSOkQk,
this.indexes = indexes; hv$uH7Fz
} fiE>H~
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publicint getStartIndex(){ `1fJ:b/M
return startIndex; {PODisl>\D
} W;Ud<7<;Z
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publicvoid setStartIndex(int startIndex){ &'5@azU
if(totalCount <= 0) I&TTr7
this.startIndex = 0; JrCf,?L^
elseif(startIndex >= totalCount) yu`KzIU
this.startIndex = indexes gp~yt0AU
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[indexes.length - 1]; ~\IF9!
elseif(startIndex < 0) QKp+;$SE'
this.startIndex = 0; +cz"`T`X 2
else{ .cg=
this.startIndex = indexes MxO
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[startIndex / pageSize]; y|q@;*rGNa
} Rk($lW)
} zmrQf/y{R
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publicint getNextIndex(){ ,wtFs!8
int nextIndex = getStartIndex() + 5^/,aI
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pageSize; <|{L[
if(nextIndex >= totalCount) =
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return getStartIndex(); %`xV'2H
else K&=1Ap
return nextIndex; 6gj]y^}
} |av*!i5Q
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publicint getPreviousIndex(){ &$mZ?%^C
int previousIndex = getStartIndex() - Op`I;Q
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pageSize; zKIGWH=qqm
if(previousIndex < 0) !oZQ2z~
return0; %04:z77
else 0LetsDN7I
return previousIndex; y;Qy"-)qb
} oM6j>&$b
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} Err4
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抽象业务类 z-n>9
java代码: R[x7QlA;
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/** M{C6rm|
* Created on 2005-7-12 lVP9=
*/ 2>F\&
package com.javaeye.common.business; 8';m)Jc
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import java.io.Serializable; &Fw[YGJayz
import java.util.List; `TUZZz
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import org.hibernate.Criteria; C">`' G2
import org.hibernate.HibernateException; hHcJN
import org.hibernate.Session; b6 $,Xh
import org.hibernate.criterion.DetachedCriteria; T!MZ+Ph`F
import org.hibernate.criterion.Projections; d; 9*l!CF
import x>}B#
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org.springframework.orm.hibernate3.HibernateCallback; ARP KzF`Wq
import 10mK}HT>4B
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org.springframework.orm.hibernate3.support.HibernateDaoS z8IPhE@
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upport; 3pB}2]
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import com.javaeye.common.util.PaginationSupport; 9/#0?(K8
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public abstract class AbstractManager extends .:rmA8U[
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HibernateDaoSupport { k!T|)\nc+
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privateboolean cacheQueries = false; 9X( Sk%
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privateString queryCacheRegion; _}D%iJg#
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publicvoid setCacheQueries(boolean aSel*
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cacheQueries){ l09Fn>wa
this.cacheQueries = cacheQueries; "u_i[[y
} m+?N7
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publicvoid setQueryCacheRegion(String 2gt+l?O<PS
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queryCacheRegion){ 9z:K1
this.queryCacheRegion = :Zza)>l
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queryCacheRegion; -LTKpN`[@
} wzd`l?o,
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publicvoid save(finalObject entity){ #<4--$Xo
getHibernateTemplate().save(entity); ylu2R0] (
} @dl8(ILk'
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publicvoid persist(finalObject entity){ +]c/&Xo!
getHibernateTemplate().save(entity); WSRy%#
} P|N2R5(>T
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publicvoid update(finalObject entity){ zCt\o
getHibernateTemplate().update(entity); ?OE#q$ g
} um7o !yg,
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publicvoid delete(finalObject entity){ )>\4ULR83
getHibernateTemplate().delete(entity); Oa!
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} |m)kN2w
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publicObject load(finalClass entity, t0q_>T-kt
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finalSerializable id){ iwU[6A
return getHibernateTemplate().load =Q-k'= 6\
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(entity, id); 2:Q(Gl`<l
} qy
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publicObject get(finalClass entity, ?R|th Z
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finalSerializable id){ }x:0os
return getHibernateTemplate().get =s;M]:
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(entity, id); h./P\eDc
} yoQ\lk
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publicList findAll(finalClass entity){ XV>@B $hu
return getHibernateTemplate().find("from 'Dath>Y=
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" + entity.getName()); hd2'AlB
} ^]>aHz9
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publicList findByNamedQuery(finalString yS!(Ap
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namedQuery){ @E%DP9.I
return getHibernateTemplate L[y Pjw:0
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().findByNamedQuery(namedQuery); zT[6eZ8m
} &J$##B
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publicList findByNamedQuery(finalString query, e4\dpvL
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finalObject parameter){ Z(e^ iH
return getHibernateTemplate ?qmp_2:WU
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().findByNamedQuery(query, parameter); :U'Cor
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} e)@3m.
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publicList findByNamedQuery(finalString query, 7C7>y/uS
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finalObject[] parameters){ /7/0x ./{
return getHibernateTemplate FJ54S
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().findByNamedQuery(query, parameters); XN;&qR^j
} gl8Ib<{
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publicList find(finalString query){ Vn, ><g
return getHibernateTemplate().find q/PNJ#<
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(query); fDh]tua
} Zb_apjg[4
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publicList find(finalString query, finalObject ^zr^ N?a
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parameter){ nlc.u}#
return getHibernateTemplate().find -tLO.JK<
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(query, parameter); C&<~f#lB
} pHC/(6?
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public PaginationSupport findPageByCriteria QkQ!Ep(
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(final DetachedCriteria detachedCriteria){ )nfEQ)L;h}
return findPageByCriteria A m"(+>W21
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); FwG!>
} <RXw M6G2
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public PaginationSupport findPageByCriteria ny*i+4Mb
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(final DetachedCriteria detachedCriteria, finalint =(o']ZaaA
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startIndex){ IG ~`i I
return findPageByCriteria nZk+
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(detachedCriteria, PaginationSupport.PAGESIZE, `]i
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startIndex); vB0RKk}d5
} L] %l51U
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public PaginationSupport findPageByCriteria uLR<FpM
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(final DetachedCriteria detachedCriteria, finalint 6 %Mt
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pageSize, P8Qyhc
finalint startIndex){ Ib=x~za@n
return(PaginationSupport) qv*7K@
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getHibernateTemplate().execute(new HibernateCallback(){ ==N{1gO]
publicObject doInHibernate HD>q(cK_|8
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(Session session)throws HibernateException { pzZk\-0R
Criteria criteria = #xh_
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detachedCriteria.getExecutableCriteria(session); .a'f|c6
int totalCount = 7gF"=7{-
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((Integer) criteria.setProjection(Projections.rowCount ^teq[l$;
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()).uniqueResult()).intValue(); tq1CwzRX
criteria.setProjection > L2HET
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(null); V)ig)(CT
List items = Z<?OwAWz
@(g_<@Jz
criteria.setFirstResult(startIndex).setMaxResults b aV>N[F&
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(pageSize).list(); q*7<)VwI
PaginationSupport ps = PNs~[
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new PaginationSupport(items, totalCount, pageSize, Pe73g%
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startIndex); $;N* c H~
return ps; 4<dcB@v
} *cuuzi&
}, true); v=@TWEE
} \y`+B*\i
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public List findAllByCriteria(final 9;.(u'y|
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DetachedCriteria detachedCriteria){ /AY4M;}p
return(List) getHibernateTemplate F,BOgWwP
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().execute(new HibernateCallback(){ "\C$
publicObject doInHibernate Yb3mP!3q8Z
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(Session session)throws HibernateException { N["W Ir
Criteria criteria = t]jFo
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detachedCriteria.getExecutableCriteria(session); YHkcWz
return criteria.list(); GPz(j'jU
} JF&$t}
}, true); K.<.cJE
} i9<pqQ
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public int getCountByCriteria(final JxE53ev
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DetachedCriteria detachedCriteria){ fWfk[(M'9
Integer count = (Integer) 2WX7nK;I
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getHibernateTemplate().execute(new HibernateCallback(){ nRL. ppUI
publicObject doInHibernate x+ncc_2n&D
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(Session session)throws HibernateException { f"7O "6
Criteria criteria = c0B|F
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detachedCriteria.getExecutableCriteria(session); A1'hlAGF
return )'17r82a
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criteria.setProjection(Projections.rowCount {;toI
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()).uniqueResult(); 61puqiGG^
} +/,icA}PI
}, true); @SZM82qU2z
return count.intValue(); {^(ACS9mL
} :I -V_4b
} .+7;)K
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用户在web层构造查询条件detachedCriteria,和可选的 #e'
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 8Ac)'2t;U
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PaginationSupport的实例ps。 3_~cMlr3T.
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ps.getItems()得到已分页好的结果集 Eskb9^A
ps.getIndexes()得到分页索引的数组 7VcmVq}X
ps.getTotalCount()得到总结果数 =mA: ctu~v
ps.getStartIndex()当前分页索引 S*j6OwZ
ps.getNextIndex()下一页索引 IDnC<