Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 %vWh1-
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 $2v{4WP7G
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 hLSas#B>
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 JN<u4\e{-&
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分页支持类: qJJ~#W)
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java代码: V53iWWaFe
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package com.javaeye.common.util; `yua?n
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import java.util.List; 8(GJz ~y
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publicclass PaginationSupport { idP2G|Z
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publicfinalstaticint PAGESIZE = 30; w;DRC5V>
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privateint pageSize = PAGESIZE; sG k'G573
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privateList items; OR-fC
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privateint totalCount; E<4'4)FHuQ
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privateint[] indexes = newint[0]; ^U{SUWl
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privateint startIndex = 0; lZhd^69y
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public PaginationSupport(List items, int y/6%'56uF
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totalCount){ `&)uuLn|
setPageSize(PAGESIZE); Q$=X
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setTotalCount(totalCount); H1kxY]_/
setItems(items); >_LZD4v!<
setStartIndex(0); r2xIbZ
} m\ (crkN
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public PaginationSupport(List items, int 3Ay<2v
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totalCount, int startIndex){ }E](NvCq
setPageSize(PAGESIZE); $]S*(K3U~
setTotalCount(totalCount); 85]3y%f9
setItems(items); j21nh >d
setStartIndex(startIndex); Pa\"l'!>^
} .7M:AS>
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public PaginationSupport(List items, int yM*f}S/
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totalCount, int pageSize, int startIndex){ ).9m6.%Uk
setPageSize(pageSize); -jQMh
setTotalCount(totalCount); n0%]dKCB
setItems(items); pv ;ZR
setStartIndex(startIndex); ^+'\
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} B@v"giJg r
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publicList getItems(){ K&>+<bJ_
return items; }
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} c*HWH$kB
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publicvoid setItems(List items){ @Xj6h!"R
this.items = items; x72T5.
} $@Kwsoh'
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publicint getPageSize(){ Sk|DVV$
return pageSize; cfA)Ui
} f{eMh47 NC
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publicvoid setPageSize(int pageSize){ E|l qlS7
this.pageSize = pageSize; =& =#G3f
} y?@(%PTp
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publicint getTotalCount(){ brt1Kvu8(
return totalCount; hqVxvS"
} ;@l5kdZx`
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publicvoid setTotalCount(int totalCount){ nN$aZSb`
if(totalCount > 0){ -TU^*
this.totalCount = totalCount; ]3bXJE
int count = totalCount / W$ag
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pageSize; K \_JG$(9
if(totalCount % pageSize > 0) S1D=' k]
count++; u[G`_Y{=EM
indexes = newint[count]; N#zh$0!8bJ
for(int i = 0; i < count; i++){ KR sY `[Y
indexes = pageSize * g;G]Xi.B}
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} 8Jb N&C
}else{ T99\R%
this.totalCount = 0; b!3Y<D*
} nYbI =_-
} Hm*?<o9mxC
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publicint[] getIndexes(){ X4{O/G
return indexes; o1?bqVF;6
} 2GC{+*
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publicvoid setIndexes(int[] indexes){ }Z Nyd
this.indexes = indexes; 2~(\d\k
} E[2>je
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publicint getStartIndex(){ uA~T.b\
return startIndex; Os>^z@x
} 6< O|,7=_
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publicvoid setStartIndex(int startIndex){ y|(C L^(
if(totalCount <= 0) eB,eu4+-
this.startIndex = 0; ?vr9l7VOi
elseif(startIndex >= totalCount) D +Ui1h-
this.startIndex = indexes I' TprT
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[indexes.length - 1]; Xah-*]ET
elseif(startIndex < 0) H". [&VP5Z
this.startIndex = 0;
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else{ `@)>5gW&p
this.startIndex = indexes 9~ JeI /
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[startIndex / pageSize]; oW\kJ>!
} xR`M#d5"
} yHIZpU|(j
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publicint getNextIndex(){ iz@LS
int nextIndex = getStartIndex() + O/1:2G/`
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pageSize; W&`{3L
if(nextIndex >= totalCount) m(o^9R_=^9
return getStartIndex(); "nQ&~KQ
else 0P7sMCYu
return nextIndex; -jdhdh
} .Mb<.R3
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publicint getPreviousIndex(){ V~!lY\
int previousIndex = getStartIndex() - 6<qVeO&uZ
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pageSize; bji^b@us_
if(previousIndex < 0) 8PXjdHR
return0; 3]cW08"c
else OuuN~yC
return previousIndex; #[$zbZ(I>:
} dJ&f +
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} [B+]F~}@
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抽象业务类 SQ0?M\D7
java代码: }K'gjs/N;
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/** vtu!* 7m
* Created on 2005-7-12 Y6w7sr_R
*/ Wv7hY"
package com.javaeye.common.business; }{y(&Oy3Y
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import java.io.Serializable; m]D3ec\K'
import java.util.List; 8K@>BFk1.
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import org.hibernate.Criteria; /*kc|V
import org.hibernate.HibernateException; b<E+5;u
import org.hibernate.Session; QpI\\Zt6
import org.hibernate.criterion.DetachedCriteria; lV
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import org.hibernate.criterion.Projections; ONU,R\jMb-
import qayM0i>>
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org.springframework.orm.hibernate3.HibernateCallback; ##r9/`A
import W:hg*0z-*
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org.springframework.orm.hibernate3.support.HibernateDaoS M,we9];N
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upport; 3]wV 1<K
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import com.javaeye.common.util.PaginationSupport; oGvk,mh"(
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public abstract class AbstractManager extends mIh >8))E
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HibernateDaoSupport {
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privateboolean cacheQueries = false; "J"RH:$v
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privateString queryCacheRegion; cf+EQY
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publicvoid setCacheQueries(boolean aGbHDo
!))!!{
cacheQueries){ HnsPXF'8g
this.cacheQueries = cacheQueries; K=N8O8R$y
} t/B4?A@C
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publicvoid setQueryCacheRegion(String Rv)*Wo!L
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queryCacheRegion){ A~M .v0
this.queryCacheRegion = x^~@`]TV^
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queryCacheRegion; des.TSZ
} 9!?Ywc>0#
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publicvoid save(finalObject entity){ U%r|hn3
getHibernateTemplate().save(entity); !%Bhg?
} <i~=-Z(
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publicvoid persist(finalObject entity){ 6]NaP_\0
getHibernateTemplate().save(entity); UZRN4tru6
} z2~\
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publicvoid update(finalObject entity){ -Dy":/Bk
getHibernateTemplate().update(entity); T6nc/|Ot
} MWq1 "c
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publicvoid delete(finalObject entity){ XImX1GH
getHibernateTemplate().delete(entity); a^g}Z7D'T
} Z9q1z~qSQ
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publicObject load(finalClass entity, LARMZoyi
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finalSerializable id){ LZ}m;
return getHibernateTemplate().load p\22_m_wd
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(entity, id); utU;M*
} lS{ ^*(a
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publicObject get(finalClass entity, wnjAiIE5
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finalSerializable id){ oS^g "hQ`\
return getHibernateTemplate().get GJIZu&C
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(entity, id); .L9n
} &$yDnSt\
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publicList findAll(finalClass entity){ yA~1$sA1
return getHibernateTemplate().find("from d]vom@iI
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" + entity.getName()); s1bb2R
} uaqV)H
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publicList findByNamedQuery(finalString 2sYz$ZGC"#
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namedQuery){ KM9H<;A
return getHibernateTemplate N{H#j6QW
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().findByNamedQuery(namedQuery); 2$Umqt
} PIHKSAnq
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publicList findByNamedQuery(finalString query, a7sX*5t{R
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finalObject parameter){ j[4l'8Ek
return getHibernateTemplate +zf`_1+)U
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().findByNamedQuery(query, parameter); C:.>*;?7
} 4mvnFY}
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publicList findByNamedQuery(finalString query, ]JQ}9"p=5
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finalObject[] parameters){ Ym?VF{e,
return getHibernateTemplate 0[p"8+x
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().findByNamedQuery(query, parameters); vG:S(/\>
} V ;"Rp-`^
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publicList find(finalString query){ K!(hj '0.
return getHibernateTemplate().find U#`2~Qv/1
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(query); B\tm
} 70{B/ ($
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publicList find(finalString query, finalObject
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parameter){ e4FR)d0x
return getHibernateTemplate().find YB.@zL0.(
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(query, parameter); U6#9W}CE
} %WPyc%I
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public PaginationSupport findPageByCriteria qfqL"G
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(final DetachedCriteria detachedCriteria){ j!"5,~
return findPageByCriteria ~9#'s'
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); AWg'J
} "A0y&^4B@
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public PaginationSupport findPageByCriteria 0,B"p
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(final DetachedCriteria detachedCriteria, finalint Bm 4$
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startIndex){ vj|#M/3>
return findPageByCriteria qL5~Wr m-W
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(detachedCriteria, PaginationSupport.PAGESIZE, (9b%'@A@m
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startIndex); c4.2o<(Xt
} {s{+MbD
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public PaginationSupport findPageByCriteria sl:1P^b
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(final DetachedCriteria detachedCriteria, finalint :i|Bz6Ht4
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pageSize, LtPaTe
finalint startIndex){ Hc-up.?v'v
return(PaginationSupport) *y', eB
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getHibernateTemplate().execute(new HibernateCallback(){ $xis4/2
publicObject doInHibernate E=91k.
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(Session session)throws HibernateException { sQ+s3x1y
Criteria criteria = 0"Zxbgu)
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detachedCriteria.getExecutableCriteria(session); R ^ZOcONd-
int totalCount = DB}v..
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((Integer) criteria.setProjection(Projections.rowCount ^$]iUb{\
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()).uniqueResult()).intValue(); u>=\.d<
criteria.setProjection F$i 6
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(null); m'M5O@?
List items = VQ8Fs/Zt!
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criteria.setFirstResult(startIndex).setMaxResults *P|~vCnr
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(pageSize).list(); 6}~k4;'}A
PaginationSupport ps = y9k'jEZ"oh
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new PaginationSupport(items, totalCount, pageSize,
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startIndex); uN1VkmtDO
return ps; y}?PyPz
} [("2=Uz;
}, true); .m.Ga|;
} O8Z+g{
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public List findAllByCriteria(final DK20}&RQ
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DetachedCriteria detachedCriteria){ n5)ml)m
return(List) getHibernateTemplate E)wf'x
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().execute(new HibernateCallback(){ e,d}4 jy
publicObject doInHibernate @|s$:;(=
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(Session session)throws HibernateException { F'CJN$6Mw/
Criteria criteria = uG/'9C6Z
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detachedCriteria.getExecutableCriteria(session); brG!TJ
return criteria.list(); KT+{-"4-
} 0/1=2E^,
}, true); %gj7KF
} [WV&Y,E
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public int getCountByCriteria(final hQ@#h`lS
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DetachedCriteria detachedCriteria){ Fnay{F8z
Integer count = (Integer) w`fbUh6/
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getHibernateTemplate().execute(new HibernateCallback(){ ia-ht>F*;
publicObject doInHibernate k~I]Y,
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(Session session)throws HibernateException { %dzO*/8cWo
Criteria criteria = ]{|lGtK %
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detachedCriteria.getExecutableCriteria(session); $$EEhy
return hwA&SS
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criteria.setProjection(Projections.rowCount O#p_rfQ
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()).uniqueResult(); W*Ow%$%2
} %I{>H%CjE
}, true); QcJC:sP\>
return count.intValue(); C%{2 sMJz
} 78 ]Kv^l^_
} 'X6Z:dZY
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用户在web层构造查询条件detachedCriteria,和可选的 &5XEjY>@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 +H *6:
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PaginationSupport的实例ps。 #Ma:Av/
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ps.getItems()得到已分页好的结果集 w%..*+P
ps.getIndexes()得到分页索引的数组 JYmYX-
ps.getTotalCount()得到总结果数 '.<c[Mp
ps.getStartIndex()当前分页索引 cd=|P?Bi
ps.getNextIndex()下一页索引 g'{?j~g
ps.getPreviousIndex()上一页索引 Ryh 0r
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