Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Ox9M![fC
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 _@OS,A
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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 Y@ X>ejk"
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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 S9%ZeM+
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分页支持类: bi[g4,`Z;
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java代码: jr/IU=u*v
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package com.javaeye.common.util; HsKq/Oyk
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import java.util.List; 3 L:SJskYR
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publicclass PaginationSupport { ^J'O8G$
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publicfinalstaticint PAGESIZE = 30; Q'rgh+6
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privateint pageSize = PAGESIZE; ~rlPS#]o
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privateList items; uc aa;zj
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privateint totalCount; ?-JW2 E"uT
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privateint[] indexes = newint[0]; l~mj>$
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privateint startIndex = 0; <Vl`EfA(
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public PaginationSupport(List items, int + cZC$lo
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totalCount){ ogqKM_
setPageSize(PAGESIZE); \%_sL#?
setTotalCount(totalCount); (t5vBUj
setItems(items); v%7Gh-P
setStartIndex(0); IV~5Y{(l
} iy|;xBI,
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public PaginationSupport(List items, int @H}{?-XyA
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totalCount, int startIndex){ A<IV"bo
setPageSize(PAGESIZE); hPuF:iiQ4
setTotalCount(totalCount); +xQj-r)-
setItems(items); KQ ^E\,@o
setStartIndex(startIndex); I#;.;%u
} h{ZK;(u$
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public PaginationSupport(List items, int 5%+epzy
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totalCount, int pageSize, int startIndex){ W9]0X
setPageSize(pageSize); Nz:p(X!
setTotalCount(totalCount); #Q BW%L
setItems(items); G=l:v
setStartIndex(startIndex); _&[ -< cu
} loUZD=Ph
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publicList getItems(){ b>]UNf"-
return items; (yoF
} V P(JV
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publicvoid setItems(List items){ fKO@Qx]
this.items = items; nI] zRduC
} h@J3+u<
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publicint getPageSize(){ /#SH`ZK
return pageSize; &UO/p/a
} {REGoe=W%
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publicvoid setPageSize(int pageSize){ g ;XK3R
this.pageSize = pageSize; _Ud! tK*H
} qRz /$|.
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publicint getTotalCount(){ J&B5Ll
return totalCount; TaF;PGjVw
} B~b
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publicvoid setTotalCount(int totalCount){ m -0EcA/
if(totalCount > 0){ <9c{Kt.5(
this.totalCount = totalCount; hZWkw{c
int count = totalCount / ;wTc_i
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pageSize; qyh]v [
if(totalCount % pageSize > 0) 8"p rWAN
count++; ?}= $zN
indexes = newint[count]; f8G<5_!K_
for(int i = 0; i < count; i++){ 8~T=p:z'
indexes = pageSize * 50a';!H
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} ='@k>Ka+
}else{ JB=L{P J
this.totalCount = 0; M#Q"h5l
} =#A/d`2
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} FYb]9MX
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publicint[] getIndexes(){ IkxoW:L
return indexes; 0k4XVd+Nv
} ,?`kYPZ
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publicvoid setIndexes(int[] indexes){ N vTp1kI]
this.indexes = indexes; ^:,wk7
} "z=~7g
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publicint getStartIndex(){ }J2f$l>R
return startIndex; L3 KJ~LI
} [nlq(DGJhp
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publicvoid setStartIndex(int startIndex){ F8M};&=*1r
if(totalCount <= 0) UUa@7|x
this.startIndex = 0;
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elseif(startIndex >= totalCount) DZA '0-
this.startIndex = indexes B~J63Os/
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[indexes.length - 1]; BB ::zBg
elseif(startIndex < 0) g@pK9R%wH<
this.startIndex = 0; T)Q_dF.N
else{ >6IUle>z
this.startIndex = indexes D9hq$?
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[startIndex / pageSize]; 1/6}E]-F
} [HQ/MkP-Z
} ~PU}==*q
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publicint getNextIndex(){ _a_T`fE&de
int nextIndex = getStartIndex() + 5H|7DVG
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pageSize; I]3!M`IMG
if(nextIndex >= totalCount) M a3}w-=;
return getStartIndex(); "$ISun=8
else i [Wxu M
return nextIndex; LlVbY=EX7
} "v0SvV<7
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publicint getPreviousIndex(){ FIu^Qd
int previousIndex = getStartIndex() - 2^nws
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pageSize; v yt|x5
if(previousIndex < 0) YkFERIa076
return0; d#W^S[[
else H^vA}F`
return previousIndex; 1Tev&J
} G|||.B8
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} 'Asr,[]?
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抽象业务类 nwqA\
java代码:
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/** EB6X
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* Created on 2005-7-12 <Z\{ijfvD
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package com.javaeye.common.business; 7#7|+%W0
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import java.io.Serializable; FJxb!-0&
import java.util.List; 7r.~L
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import org.hibernate.Criteria; |WfL'_?$
import org.hibernate.HibernateException; lvNi/jk
import org.hibernate.Session; Vo%Z|
import org.hibernate.criterion.DetachedCriteria; >hV2p/D
import org.hibernate.criterion.Projections; qZv@ULluc
import zE?dQD^OD
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org.springframework.orm.hibernate3.HibernateCallback; ZPz=\^
import
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org.springframework.orm.hibernate3.support.HibernateDaoS f/4DFs{
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upport; 4Tx.|
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import com.javaeye.common.util.PaginationSupport; r6:e
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public abstract class AbstractManager extends ta
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HibernateDaoSupport { D,(:))DmR
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privateboolean cacheQueries = false; eV}H
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privateString queryCacheRegion; "*(a2k3J
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publicvoid setCacheQueries(boolean D]|{xK C}
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cacheQueries){ 8s-X H
this.cacheQueries = cacheQueries; @U1t~f^
} *19a\m=>oi
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publicvoid setQueryCacheRegion(String |oe
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queryCacheRegion){ !T8sWMY
this.queryCacheRegion = ZA@zs,o%
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queryCacheRegion; N S*Lv
} &n0Ag]$P
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publicvoid save(finalObject entity){ }qZ^S9
getHibernateTemplate().save(entity); l0g+OMt
} p1mAoVxR
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publicvoid persist(finalObject entity){ Pt-O1$C[
getHibernateTemplate().save(entity); -pQ?ybQ
} W`TSR?4~t?
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publicvoid update(finalObject entity){ bUSa#pNO>
getHibernateTemplate().update(entity); D>Rlm,U
} Q:b0!
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publicvoid delete(finalObject entity){ yw89*:A6
getHibernateTemplate().delete(entity); 'SrDc'?
} ;ZP!:,
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publicObject load(finalClass entity, ltNY8xrdGN
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finalSerializable id){ ZW@cw}
return getHibernateTemplate().load ,wv>G]v
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(entity, id); }ov>b2H#<
} %Q;:nVt
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publicObject get(finalClass entity, fGe"1MfU
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finalSerializable id){ %e|UA-(
return getHibernateTemplate().get TB84}
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(entity, id); -SzCeq(p%5
} X\*H7;k,
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publicList findAll(finalClass entity){ \nL@P6X
return getHibernateTemplate().find("from 7vI
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" + entity.getName()); yC4%z)t&R
} =2vZqGO30
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publicList findByNamedQuery(finalString 8p1:dTI5Pb
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namedQuery){ WE-+WC!!:
return getHibernateTemplate u^x<xw6f
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().findByNamedQuery(namedQuery); J&+"
} 'RNj5r
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publicList findByNamedQuery(finalString query, z(>:LX"xz
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finalObject parameter){ :r{W)(mm
return getHibernateTemplate 0TiDQ4}i[
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().findByNamedQuery(query, parameter); %%h.`p1
} RtDTcaW/
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publicList findByNamedQuery(finalString query, Vn_>c#B
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finalObject[] parameters){ <Oy2JjY
return getHibernateTemplate c^5fhmlt
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().findByNamedQuery(query, parameters); 6k+tO%{~
} XZ3M~cDq
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publicList find(finalString query){ ?3v-ppw%
return getHibernateTemplate().find xZloEfv.B
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(query); K;TTGK
} xq%BR[1
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publicList find(finalString query, finalObject 8*uaI7;*
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parameter){ ,.Lo)[(
return getHibernateTemplate().find Q
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(query, parameter); jo0XOs
} :U @L$
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public PaginationSupport findPageByCriteria 7&V3f=aj6
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(final DetachedCriteria detachedCriteria){ %fh-x(4v
return findPageByCriteria i2LN`5k
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 1 Va@w
} V9`jq$
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public PaginationSupport findPageByCriteria +bWo{
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(final DetachedCriteria detachedCriteria, finalint }F3}"Ik'L
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startIndex){ QxBH{TG
return findPageByCriteria (W9 K:]}
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(detachedCriteria, PaginationSupport.PAGESIZE, mDWRYIuN
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startIndex); gLbTZM4i
} ` ^z
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public PaginationSupport findPageByCriteria fs#9*<]m
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(final DetachedCriteria detachedCriteria, finalint Hqu?="f=
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pageSize, VB4ir\nF
finalint startIndex){ W:2j.K9!
return(PaginationSupport) !Jaj2mS.N
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getHibernateTemplate().execute(new HibernateCallback(){ 01+TVWKX
publicObject doInHibernate !1bATO:x
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(Session session)throws HibernateException { #5^S@}e
Criteria criteria = 2j[;M-3
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detachedCriteria.getExecutableCriteria(session); m;u :_4
int totalCount = asYUb&Hz88
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((Integer) criteria.setProjection(Projections.rowCount QEY#U|
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()).uniqueResult()).intValue(); //^{u[lr
criteria.setProjection k,r}X:<6jz
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(null); [iN\R+:
List items = Dwah_ p8
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criteria.setFirstResult(startIndex).setMaxResults .gw6W0\F
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(pageSize).list(); -qB{TA-.\
PaginationSupport ps = 5^36nEoA(
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new PaginationSupport(items, totalCount, pageSize, twql)lbx
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startIndex); K`kWfPwp
return ps; D(Q=EdlO
} PtOYlZTe?
}, true); }A7]bd
} V}q=!zz
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public List findAllByCriteria(final \Jr7Hy1;
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DetachedCriteria detachedCriteria){ uBo~PiJ2"
return(List) getHibernateTemplate ?qczMck_
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().execute(new HibernateCallback(){ ??g
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publicObject doInHibernate /SJI ~f+$
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(Session session)throws HibernateException { ~G8haN4
Criteria criteria = :n$?wp
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detachedCriteria.getExecutableCriteria(session); lBOxB/`
return criteria.list(); lC=T{rR
} pt9fOih[
}, true); 5m
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} ~|=G3(I[
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public int getCountByCriteria(final 3aEO9v,n
=~{W;VZt'
DetachedCriteria detachedCriteria){ a*Ng+~5)6
Integer count = (Integer) ~{np G
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getHibernateTemplate().execute(new HibernateCallback(){ 4Pr@<S"U
publicObject doInHibernate ZNY),3?
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(Session session)throws HibernateException { 5@{~830
Criteria criteria = _l&.<nz
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detachedCriteria.getExecutableCriteria(session); k\lU
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return 8POLp9>X
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criteria.setProjection(Projections.rowCount }1Km h]
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()).uniqueResult(); %51HJB}C]
} U7d05y'
}, true); "AHuq%j
return count.intValue(); MGSD;Lgn
} 3+WostOx
} Xa/]}
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用户在web层构造查询条件detachedCriteria,和可选的 {DbWk>[DkG
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 qM:*!Aq0g
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PaginationSupport的实例ps。 s,;L6nX"
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ps.getItems()得到已分页好的结果集 XFWo"%}w
ps.getIndexes()得到分页索引的数组 |NXe{q7{
ps.getTotalCount()得到总结果数 ,(&