Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 T2/:C7zL
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 s2<[@@@q
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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 ma+AFCi
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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 0#DEh|?
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分页支持类: ;g? |y(xv
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java代码: s'oNW
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package com.javaeye.common.util; #4b]j".P!n
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import java.util.List; R^$|D)(
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publicclass PaginationSupport { %T\hL\L?
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publicfinalstaticint PAGESIZE = 30; k}Q<#
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privateint pageSize = PAGESIZE; 2jC` '8
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privateList items; CUYA:R<)
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privateint totalCount; aY#?QjL
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privateint[] indexes = newint[0]; ON){d!]uJ
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privateint startIndex = 0; ~^V&n`*7D
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public PaginationSupport(List items, int XWnP(C9?
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totalCount){ R-j*fO}
setPageSize(PAGESIZE); |Rz.Pt6
setTotalCount(totalCount); DegbjqZ#
setItems(items); /De~K+w7o
setStartIndex(0); .=
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} 8>,w8(Nt
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public PaginationSupport(List items, int 3>-h-
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totalCount, int startIndex){ &.\7='$F
setPageSize(PAGESIZE); 3g;,
setTotalCount(totalCount); m]!hP^^
setItems(items); @)uV Fw"\
setStartIndex(startIndex); twq~.:<o
} xlS*9>Ij
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public PaginationSupport(List items, int DJL.P6 -W
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totalCount, int pageSize, int startIndex){ o~IAZU39
setPageSize(pageSize);
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setTotalCount(totalCount); hc[ K
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setItems(items); 5tQz!M
setStartIndex(startIndex); hj9TiH/+
} Td|u@l4B
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publicList getItems(){ %7)TiT4V
return items; (Z(S?`')
} $M 8&&M
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publicvoid setItems(List items){ 3T F_$bd{
this.items = items; p>`rTaeZg
} )*;Tt @'y
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publicint getPageSize(){ >bh+!5Y0
return pageSize; %7 bd}sJ#
} su1lv#
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publicvoid setPageSize(int pageSize){ q2vD)r
this.pageSize = pageSize; 1N8] ~j
} UxTLr-db^
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publicint getTotalCount(){ *9EwZwE_K
return totalCount; Ig`q[o
} -[L\:'Gp5
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publicvoid setTotalCount(int totalCount){ F,wB6Cw
if(totalCount > 0){ 'F/oR/4,
this.totalCount = totalCount; h#hr'3bI1
int count = totalCount / B>^6tdz
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pageSize; ^?`fN'!p
if(totalCount % pageSize > 0) (@+pz/
count++; CUI3^;&S
indexes = newint[count]; m4hkV>$d
for(int i = 0; i < count; i++){ @kFZN 6
indexes = pageSize * SKL 4U5D{
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} ltNCti{Q
}else{ iWf+wC|
this.totalCount = 0; G&g;ROgY
} 2!sPgIz
} E(r_mF7:
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publicint[] getIndexes(){ \34vE@V*
return indexes; @ep.wW
} N>H@vt~
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publicvoid setIndexes(int[] indexes){ L@S\ rImw
this.indexes = indexes; <T}U 3lL^
} L7C ;l,ot
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publicint getStartIndex(){ ~v;I>ij
return startIndex; nHdQe
} Vke<; k-
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publicvoid setStartIndex(int startIndex){ dw"Es;^
if(totalCount <= 0) oe|#!SM(
this.startIndex = 0; `q*[fd1u.
elseif(startIndex >= totalCount) =OHX5:Z
this.startIndex = indexes kXwAw]ogN
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[indexes.length - 1]; 9Y:I)^ek
elseif(startIndex < 0) 5^g*
this.startIndex = 0; 0Qt!w(
else{ R5uG.Oj-2
this.startIndex = indexes bw P=f.
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[startIndex / pageSize]; j&d5tgLB
} , _e[P
} 1Toiqb/
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publicint getNextIndex(){ ,eyh%k*hz
int nextIndex = getStartIndex() + 8_('[89m
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pageSize; yJ $6vmQ
if(nextIndex >= totalCount) ^^N|:80
return getStartIndex(); Jl~ *@0(
else RpivO,
return nextIndex; lx:$EJ
} DhyR
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publicint getPreviousIndex(){ $l]:2!R
int previousIndex = getStartIndex() - E!9WZY
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pageSize; A(FnU:
if(previousIndex < 0) )^ah, ;(
return0; d0:LJ'<Q
else "2cOS PpQL
return previousIndex; FH,]'
} !Y~UO)u2
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} YRu@;
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抽象业务类 vjS`;^9
java代码: d_!Z /M,
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/** ?})A-$f ~
* Created on 2005-7-12 \Bo%2O%4
*/ k1wIb']m]z
package com.javaeye.common.business; 2l<2srEK
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import java.io.Serializable; #Z%"
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import java.util.List; |MwV4^
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import org.hibernate.Criteria; 2ioHhcYdJU
import org.hibernate.HibernateException; A=N$5ZJ
import org.hibernate.Session; 28!C#.(h
import org.hibernate.criterion.DetachedCriteria; AP&//b,^M
import org.hibernate.criterion.Projections; 53i]Q;k [
import 5CY%h
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org.springframework.orm.hibernate3.HibernateCallback; m+(Cl#+
import vXJPvh<
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org.springframework.orm.hibernate3.support.HibernateDaoS F/oqYk9`
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upport; b84l`J
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import com.javaeye.common.util.PaginationSupport; n28JWkK8
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public abstract class AbstractManager extends PgkU~68`
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HibernateDaoSupport { |:eTo<
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privateboolean cacheQueries = false; !.vyzCJTzB
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privateString queryCacheRegion; . &^p@A~
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publicvoid setCacheQueries(boolean [H h-F#|R
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cacheQueries){ n~^SwOt~;5
this.cacheQueries = cacheQueries; pfN(Ae
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} :G _
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publicvoid setQueryCacheRegion(String 2R/|/>T v
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queryCacheRegion){ T\l`Y-vu
this.queryCacheRegion = *tXyd<_Hd
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queryCacheRegion; p@tg pFt
} 0AB a&'h
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publicvoid save(finalObject entity){ CWdsOS=
getHibernateTemplate().save(entity); T fLqxioqZ
} J"r?F0
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publicvoid persist(finalObject entity){ ~i.*fL_Y
getHibernateTemplate().save(entity); a-NTA
} }Ng P`m
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publicvoid update(finalObject entity){ 7e"}ojt$
getHibernateTemplate().update(entity); 8['R D`O
} .+:iAnf
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publicvoid delete(finalObject entity){ a"jE\OZ{+s
getHibernateTemplate().delete(entity); rW?WdEg
} j9
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publicObject load(finalClass entity, }5
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finalSerializable id){ x%mRDm~-
return getHibernateTemplate().load ~gI%lORqN
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(entity, id); 9?l a5
} &S >{9y%
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publicObject get(finalClass entity, 6`e{l+c=F
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finalSerializable id){ uxfh?gsL
return getHibernateTemplate().get ZM<6yj"f
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(entity, id); f+Y4~k
} :c*"Dx'D
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publicList findAll(finalClass entity){ Vl_6nY;
return getHibernateTemplate().find("from gFaZ ._
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" + entity.getName()); Hv;xaT<}V
} u
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publicList findByNamedQuery(finalString !ku}vTe
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namedQuery){ `O\>vn
return getHibernateTemplate ;<+efYmyc
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().findByNamedQuery(namedQuery); Ud/>oaW?s
} 3%POTAw%
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publicList findByNamedQuery(finalString query, `D+zX
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finalObject parameter){ Wdd}y`lS
return getHibernateTemplate S!?T0c?>
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().findByNamedQuery(query, parameter); BE?]P?r?
} pCKP{c=6Q
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publicList findByNamedQuery(finalString query, _pdKcE\X
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finalObject[] parameters){ J9T2 p\5
return getHibernateTemplate <9@n/
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().findByNamedQuery(query, parameters); Zmu
} B}"R@;N
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publicList find(finalString query){ MzvhE0ab
return getHibernateTemplate().find tD8fSV
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(query); kz=ho~ @
} 3bRxV
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publicList find(finalString query, finalObject DGFSD Py[
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parameter){
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return getHibernateTemplate().find S`-I-VS=L
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(query, parameter); ?1=.scmgDG
} fJ}e
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public PaginationSupport findPageByCriteria x;vfmgty
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(final DetachedCriteria detachedCriteria){ 971=OEyq*
return findPageByCriteria \,;glY=M!
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); n.+*_c8 k
} fN2Sio:
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public PaginationSupport findPageByCriteria /d&m#%9Up]
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(final DetachedCriteria detachedCriteria, finalint BK!Yl\I<
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startIndex){ J^8j|%h%e
return findPageByCriteria Dl>tF?=
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(detachedCriteria, PaginationSupport.PAGESIZE, Fyvo;1a
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startIndex); h8V*$
} zg jg #|
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public PaginationSupport findPageByCriteria .X!!dx1<
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(final DetachedCriteria detachedCriteria, finalint JC'3x9_<z
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pageSize, +P(*S
finalint startIndex){ Gamn,c9
return(PaginationSupport) Tg)F.):
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getHibernateTemplate().execute(new HibernateCallback(){ {\>4)TA
publicObject doInHibernate -VohU-6 |
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(Session session)throws HibernateException { ;0eVE
Criteria criteria = ~gX1n9_n
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detachedCriteria.getExecutableCriteria(session); ?8
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int totalCount = aR2N,<Cp5
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((Integer) criteria.setProjection(Projections.rowCount NDRDP D
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()).uniqueResult()).intValue(); 99OZK
criteria.setProjection *<\`"C;
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(null); ?;tPqOs&
List items = nf
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criteria.setFirstResult(startIndex).setMaxResults ;Am3eJa*-
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(pageSize).list(); *k(FbZ
PaginationSupport ps = S$b)X"h
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new PaginationSupport(items, totalCount, pageSize, bg~CV&]M
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startIndex); 8R)K$J$Hm
return ps; 2D!jVr!
} F
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}, true); ]v<8l4p;
} hT%fM3|,e
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public List findAllByCriteria(final _4oAk @A
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DetachedCriteria detachedCriteria){ =Ji[ ;wy@
return(List) getHibernateTemplate .$~3RjM
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().execute(new HibernateCallback(){ cK|Uwzifd
publicObject doInHibernate 7"|Qmyb
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(Session session)throws HibernateException { iZTU]+z!
Criteria criteria = &wi+)d
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detachedCriteria.getExecutableCriteria(session); r QzdHA
return criteria.list(); !v2/sq$G
} `GE8?UO-
}, true); RrxbsG1HP
} ,|c;x1|O
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public int getCountByCriteria(final MXW1:
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DetachedCriteria detachedCriteria){ 7bYwh8
Integer count = (Integer) R\cx-h*
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getHibernateTemplate().execute(new HibernateCallback(){ {5VJprTbv
publicObject doInHibernate i>S@C@~
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(Session session)throws HibernateException { 09McUR@
Criteria criteria = 1*A^v
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detachedCriteria.getExecutableCriteria(session); I{w(`[Nxw*
return bR3Crz(9G
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criteria.setProjection(Projections.rowCount 6!i`\>I]
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()).uniqueResult(); cKYvNM
} ]$#bNt/p
}, true); ,~7~ S"
return count.intValue(); M*k,M=sX
} VMABj\yG
} Uic
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用户在web层构造查询条件detachedCriteria,和可选的 =WUNBav
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 -pJ\_u/&%`
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PaginationSupport的实例ps。 ,$!F,c
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ps.getItems()得到已分页好的结果集 gIO_mJ3 u
ps.getIndexes()得到分页索引的数组 xw{K,;WeO
ps.getTotalCount()得到总结果数 NEIF1(:
ps.getStartIndex()当前分页索引 @=G[mc\
ps.getNextIndex()下一页索引 (<B%Gy@
ps.getPreviousIndex()上一页索引 )z&C&Gqz
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 N5W!(h)
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ?6"U('y>n
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一下代码重构了。 E4=D$hfq`
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