Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 9hr7+fW]t
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 loA/d
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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 2n.HmS
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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 (iKJ~bJ
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分页支持类: KHx2$*E_
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java代码: a!R*O3
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package com.javaeye.common.util; b |:Y3_>
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import java.util.List; H!*ypJ
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publicclass PaginationSupport { lEl.'X$
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publicfinalstaticint PAGESIZE = 30; 'goKYl#1Q
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privateint pageSize = PAGESIZE; 4T3Z9KD!8
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privateList items; N.mRay,
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privateint totalCount; R'sNMWM
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privateint[] indexes = newint[0]; #b/L~Bw[
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privateint startIndex = 0; Sm<*TH!\n_
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public PaginationSupport(List items, int GXxI=,L8F
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totalCount){ _<RTes
setPageSize(PAGESIZE); ?L\"qz%gP
setTotalCount(totalCount); ~ 1;M4K
setItems(items); 7P2n{zd,
setStartIndex(0); i[9yu-
} ;>mM9^Jaf
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public PaginationSupport(List items, int xjr4')h
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totalCount, int startIndex){ 8)bR\s
setPageSize(PAGESIZE); ;ZUj2WxE
setTotalCount(totalCount); SbGdcCB
setItems(items); H;4QuB'^
setStartIndex(startIndex); 0Qa0
} FA*$ dwp
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public PaginationSupport(List items, int .2c/V
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totalCount, int pageSize, int startIndex){ *ES"^N/88
setPageSize(pageSize); RL"hAUs_1
setTotalCount(totalCount); 'Hq#9?<2M
setItems(items); Oh=Kl3xs
setStartIndex(startIndex); 6,p;8I
} f1Gyl
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publicList getItems(){ w4uY/!~k
return items; N?s5h?
} .uo:fxbd2
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publicvoid setItems(List items){ v kW2&
this.items = items; sGbk4g
} w}(Ht_6q{
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publicint getPageSize(){ lJ4&kF=t
return pageSize; rgrsNr:1
} V7Mp<x%
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publicvoid setPageSize(int pageSize){ b@N*W]
this.pageSize = pageSize; F='rGQK!1
} _sNJU
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publicint getTotalCount(){ :e TzjW=
return totalCount; v>p~y u+G
} JclG*/Wjg4
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publicvoid setTotalCount(int totalCount){ (Z};(Hn
if(totalCount > 0){ Vbpt?1:
this.totalCount = totalCount; RVe UQ%
int count = totalCount / dI9u:-
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pageSize; J@pCF@'
if(totalCount % pageSize > 0) YumHECej
count++; x4bj?=+
indexes = newint[count]; _,9/g^<
for(int i = 0; i < count; i++){ p7Q
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indexes = pageSize * n42XqR
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} OBmmOswg~
}else{ )o@-h85";
this.totalCount = 0; lCMU{)
} 9zK5Y+!
} `$,
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publicint[] getIndexes(){ /6@Wm?`DB
return indexes; F`\7&'I
} %o9;jX
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publicvoid setIndexes(int[] indexes){ {:r8X
this.indexes = indexes; H+ Y+8
} `^7ARr/
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publicint getStartIndex(){ 6~j.S
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return startIndex; =W~K_jE5lo
} j4G?=oDb
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publicvoid setStartIndex(int startIndex){ ?YO$NYwE
if(totalCount <= 0) GGR hM1II
this.startIndex = 0; g [~"c}
elseif(startIndex >= totalCount) #YMU}4=:
this.startIndex = indexes * -Kf
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[indexes.length - 1]; i;
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elseif(startIndex < 0) V:w=h>z8
this.startIndex = 0; HFL(t]
else{ _g(4-\
this.startIndex = indexes . !|3a
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[startIndex / pageSize]; 62X;gb
} Ox` +Z0)a
} aBO%qmtt
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publicint getNextIndex(){ K9X0/
int nextIndex = getStartIndex() + 3d2|vQx,K
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pageSize; Lit@ m2{\
if(nextIndex >= totalCount) ]~SOGAFW
return getStartIndex(); Z~VSWrw3
else #*[G,s#t^
return nextIndex; JZ5NQ)sX
} D4x~Vk%H
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publicint getPreviousIndex(){ o1"MW>B,4
int previousIndex = getStartIndex() - P-?ya!@"
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pageSize; RQZ|:SvV
if(previousIndex < 0) ?2b*FQe
return0; $~|#Rz%v
else +K3SAGm
return previousIndex; j7vp@l6`L
} D|u! KH
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} ==[a7|q
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抽象业务类 ^ $M@yWX6
java代码: NM0[yh
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/** O'~c;vBI
* Created on 2005-7-12 smpz/1U
*/ ?NZKu6
package com.javaeye.common.business; &R54?u^A
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import java.io.Serializable; '1lr "}"Q+
import java.util.List; a}Db9 =
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import org.hibernate.Criteria; HSk gS
import org.hibernate.HibernateException; =_%i5]89P
import org.hibernate.Session; &C eG4_Mi
import org.hibernate.criterion.DetachedCriteria; j +j2_\
import org.hibernate.criterion.Projections; ffuV158a&
import #"^F:: b-
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org.springframework.orm.hibernate3.HibernateCallback; sp4J%2b
import (nk)'ur.
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org.springframework.orm.hibernate3.support.HibernateDaoS 6&pI{
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upport; ), >jBYMJ
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import com.javaeye.common.util.PaginationSupport; @V/Lqia
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public abstract class AbstractManager extends EP.nVvuL
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HibernateDaoSupport { =H T:p:S
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privateboolean cacheQueries = false; fk%yi[
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privateString queryCacheRegion; usb.cE3z
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publicvoid setCacheQueries(boolean +u1meh3u
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cacheQueries){ c[:OK9TH
this.cacheQueries = cacheQueries; x!klnpGp
} 3.q%?S}*
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publicvoid setQueryCacheRegion(String {@1C,8n;
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queryCacheRegion){ W2L:
this.queryCacheRegion = TrxZS_
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queryCacheRegion; nQuiRTU<
} 0be1aY;m&
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publicvoid save(finalObject entity){ YQ}xr^VA
getHibernateTemplate().save(entity); L,*KgLG
} }q1@[
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publicvoid persist(finalObject entity){ B .p&,K
getHibernateTemplate().save(entity);
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} k9j_#\E[
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publicvoid update(finalObject entity){ BKDs3?&
getHibernateTemplate().update(entity); )Lht}I ]:
} E"l&<U
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publicvoid delete(finalObject entity){ >jEn>H?
getHibernateTemplate().delete(entity); @xKLRw
} O$jj&
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publicObject load(finalClass entity, 1PWs">*(
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finalSerializable id){ ( lbF/F>v
return getHibernateTemplate().load KK;3<kX
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(entity, id); ;cQhs7m(9
} Qs2E>C
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publicObject get(finalClass entity, 7'wt/9
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finalSerializable id){ a1Q|su{H
return getHibernateTemplate().get ;V(- ;O
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(entity, id); z@\C/wX
} Wbo{v r[2+
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publicList findAll(finalClass entity){ _DPWp,k<~
return getHibernateTemplate().find("from /]H6'
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" + entity.getName()); _2Sb?]Xn
} 3xS+Pu\)
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publicList findByNamedQuery(finalString W- Q:G=S-
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namedQuery){ _t<D~
return getHibernateTemplate qzk/P1{-
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().findByNamedQuery(namedQuery); DBDHe-1[+
} 5WN^8`{'3
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publicList findByNamedQuery(finalString query, ~jdvxoX-
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finalObject parameter){ `.3!
return getHibernateTemplate ; MU8@?yN
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().findByNamedQuery(query, parameter); z%xWP&3%"
} +X[+SF)!
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publicList findByNamedQuery(finalString query, 6&8 ([J
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finalObject[] parameters){ D$C >ZF
return getHibernateTemplate qYD$_a
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().findByNamedQuery(query, parameters); y V=Ku
} y/}[S@4uB
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publicList find(finalString query){ x*}41;j}C
return getHibernateTemplate().find =l6aSr
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(query); 8K: RoR
} 0p6
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publicList find(finalString query, finalObject [
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parameter){ =T_E]>FF9
return getHibernateTemplate().find JbT+w\o
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(query, parameter); 5^kLNNum
} 0,1x-
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public PaginationSupport findPageByCriteria BE,XiH;
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(final DetachedCriteria detachedCriteria){ [k1N-';;;
return findPageByCriteria )OjTn"
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(detachedCriteria, PaginationSupport.PAGESIZE, 0);
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} m Acny$u
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public PaginationSupport findPageByCriteria <x&0a$I
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(final DetachedCriteria detachedCriteria, finalint 5ynBVrYf
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startIndex){ O}#Ic$38
return findPageByCriteria dO?zLc0f
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(detachedCriteria, PaginationSupport.PAGESIZE, 8'K~+L=}
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startIndex); F~bDA~
} DIqM\ ><
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public PaginationSupport findPageByCriteria [j3-a4Wu
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(final DetachedCriteria detachedCriteria, finalint s<z`<^hRe
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pageSize, @euH[<
finalint startIndex){ ppm=o4`s[
return(PaginationSupport) Fb2,2Px
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getHibernateTemplate().execute(new HibernateCallback(){ HZASIsl
publicObject doInHibernate $ol]G`+
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(Session session)throws HibernateException { [c^!;YBp)
Criteria criteria = <mrvuWg0
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detachedCriteria.getExecutableCriteria(session); C33BP}c]
int totalCount = xNrPj8V<Y
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((Integer) criteria.setProjection(Projections.rowCount GyC/39<P
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()).uniqueResult()).intValue(); `w6*(t:T
criteria.setProjection ^ABtg#
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(null); "|Ke/0rGB
List items = r* q
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criteria.setFirstResult(startIndex).setMaxResults adcH3rV
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(pageSize).list(); &%UZ"CcA
PaginationSupport ps = exZgk2[0
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new PaginationSupport(items, totalCount, pageSize, a1>Tz
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startIndex); :[:*kbWN-
return ps; rNK<p3=7)
} &wX568o
}, true); a'%eyN
} 1!%T<!A.
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public List findAllByCriteria(final O:]e4r,'
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DetachedCriteria detachedCriteria){ 43}uW,P
return(List) getHibernateTemplate uv&4
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().execute(new HibernateCallback(){ kt#t-N;}x
publicObject doInHibernate N;HG@B!m
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(Session session)throws HibernateException { ${ 5E
Criteria criteria = 7Y%Si5
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detachedCriteria.getExecutableCriteria(session); V"|`Z}XW
return criteria.list(); ]&?8l:3-G
} ;0 4< 9i
}, true); =D`:2k~
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} `J$7X
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public int getCountByCriteria(final 8
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DetachedCriteria detachedCriteria){ 1d!TU=*
Integer count = (Integer) (@Kc(>(: Y
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getHibernateTemplate().execute(new HibernateCallback(){ 6 u 1|pX8
publicObject doInHibernate -cWGF
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(Session session)throws HibernateException { Ltk-1zhI
Criteria criteria = `n"PHur
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detachedCriteria.getExecutableCriteria(session); cAn_:^
return <
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criteria.setProjection(Projections.rowCount AHU=`z
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()).uniqueResult(); F+]cFx,/
} 6lL^/$]
}, true); 2%/+r
return count.intValue(); G8.nKoHv7x
} !ou;yE&<,
} .;)V;!
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用户在web层构造查询条件detachedCriteria,和可选的 }S;A%gYm
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 !;K zR&
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PaginationSupport的实例ps。 ZSr!L@S
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ps.getItems()得到已分页好的结果集 >uDC!0)R
ps.getIndexes()得到分页索引的数组 &