Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 E`wq`g`H<
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 yzNDXA.
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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 cft@sY
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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 _w5c-\-PUM
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分页支持类: mLHl]xs4
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java代码: K1-3!G
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package com.javaeye.common.util; 3XUie;*`
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import java.util.List; "@xL9[d
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publicclass PaginationSupport { [&p/7
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publicfinalstaticint PAGESIZE = 30; 2d OUY
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privateint pageSize = PAGESIZE; > mP([]
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privateList items; k,/2]{#53d
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privateint totalCount; 1=jwJv.^/
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privateint[] indexes = newint[0]; Y^5)u/Y=U
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privateint startIndex = 0; 2
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public PaginationSupport(List items, int *nY$YwHB
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totalCount){ QLH6Nmk
setPageSize(PAGESIZE); #4^D'r>pJ
setTotalCount(totalCount); ;E\ e.R
setItems(items); &c81q2
setStartIndex(0); iuoZk5O
} SiT5QJe
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public PaginationSupport(List items, int D{]9s
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totalCount, int startIndex){ $&0\BvS
setPageSize(PAGESIZE); fSm|anuKZe
setTotalCount(totalCount); n'<F'1SWv
setItems(items); pRh)DM#9
setStartIndex(startIndex); 9Qc=D"'
} wB%;O `Oh
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public PaginationSupport(List items, int $7&t`E)qY
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totalCount, int pageSize, int startIndex){ +C`zI~8
setPageSize(pageSize); \7tJ)[0aF
setTotalCount(totalCount); GuRJ
setItems(items); qfB!)Y
setStartIndex(startIndex); U$6(@&P!
} 0"xD>ue&
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publicList getItems(){ h[j(@P
return items; |6zx
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} 1H7bPl|
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publicvoid setItems(List items){ N/eFwv.Er
this.items = items; bc*CP0t|
} r>7Dg~)V
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publicint getPageSize(){ C4t@;U=x
return pageSize; s7na!A[
} Qon>[<]B
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publicvoid setPageSize(int pageSize){ H!uq5`j0K
this.pageSize = pageSize; $}Ky6sBnvO
} \kVi&X=q:
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publicint getTotalCount(){ )+12r6W
return totalCount; >`D$Jz,
} _6{XqvWqb
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publicvoid setTotalCount(int totalCount){ s_Gf7uC
if(totalCount > 0){ b0lZb'
this.totalCount = totalCount; *WZ?C|6+
int count = totalCount / xC.Tipn>
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pageSize; 04QY
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if(totalCount % pageSize > 0) <&p0:S7
count++; bf-V Q7
indexes = newint[count]; G7d)X^q!xS
for(int i = 0; i < count; i++){ {{ /-v3n
indexes = pageSize * ?D`h[ai
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i; Vrx3%_NkQ
} o<nkK+=Afm
}else{ :x/L.Bz
this.totalCount = 0; f%5 s8)
} )-_To&S*
} a C<
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publicint[] getIndexes(){ ^Y-
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return indexes; bO\E)%zp
} $g+q;Y~i0
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publicvoid setIndexes(int[] indexes){ PcK;L(
this.indexes = indexes; }E]&,[4&M
} w*7BiZ{s<
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publicint getStartIndex(){ z9)I@P"
return startIndex; 9$oU6#U,h
} -P'KpX:]hd
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publicvoid setStartIndex(int startIndex){ vgvJ6$#
if(totalCount <= 0) @#= ail
this.startIndex = 0; 6e.?L
elseif(startIndex >= totalCount) q=(.N>%
this.startIndex = indexes .S=^)
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[indexes.length - 1]; tV5Uz&:b
elseif(startIndex < 0) Q1?09
this.startIndex = 0; 2N$yn
else{ j9G1
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this.startIndex = indexes [h^>Iq
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[startIndex / pageSize]; bQFMg41*w7
} ;)nV
} }uaRS9d
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publicint getNextIndex(){ 7@*l2edXm+
int nextIndex = getStartIndex() + UZ` <D/
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pageSize; R<GnPN:c
if(nextIndex >= totalCount)
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return getStartIndex(); h
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else [)E.T,fjMQ
return nextIndex; E"l/r4*f@
} WzwH;!
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publicint getPreviousIndex(){ l9"T"9C{
int previousIndex = getStartIndex() - wVms"U.
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pageSize; 9AgTrP
if(previousIndex < 0) (ndTEnpp
return0; RMfKM!
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else %Ct^{k~1
return previousIndex; #2~-I
} qP}187Q1
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} E9"P~ nz
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抽象业务类 :47bf<w|Y
java代码: ;;#_[Zl
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/** H`:2J8
* Created on 2005-7-12 Ww[Xqmg
*/ Gz,?e]ZV
package com.javaeye.common.business; lI<Q=gd
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import java.io.Serializable; R|&Rq(ow"
import java.util.List; y_7lSo8<
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import org.hibernate.Criteria; s)L\D$;+O
import org.hibernate.HibernateException; K|{IX^3)V
import org.hibernate.Session; /qd5{%:
import org.hibernate.criterion.DetachedCriteria; X^td`}F/=V
import org.hibernate.criterion.Projections; '<JNS8h
import OABMIgX
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org.springframework.orm.hibernate3.HibernateCallback; =1vl-*uYh
import cOq'MDr
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org.springframework.orm.hibernate3.support.HibernateDaoS Y_gMoo
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upport; jGSY$nt9
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import com.javaeye.common.util.PaginationSupport; D"z3SLFW{
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public abstract class AbstractManager extends p|gzU$FWbk
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HibernateDaoSupport { nr{#Krkb
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privateboolean cacheQueries = false; cEK<CV
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privateString queryCacheRegion; AbExJ~JV\g
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publicvoid setCacheQueries(boolean V'q?+p]
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cacheQueries){ 1`Ig A0V`"
this.cacheQueries = cacheQueries; j%`%
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} CiNOGSlDj
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publicvoid setQueryCacheRegion(String EEn8]qJC
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queryCacheRegion){ 1VR|z
this.queryCacheRegion = L[cP2X]NQ
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queryCacheRegion; E Xxv
} *yZ `aKfH
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publicvoid save(finalObject entity){ U!\~LKfA
getHibernateTemplate().save(entity); S0'
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} h.*v0cq:
KDS}"/
publicvoid persist(finalObject entity){ |pG%]?A
getHibernateTemplate().save(entity); `oU|U!|
} ~+)>D7
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publicvoid update(finalObject entity){ >i_ #q$o
getHibernateTemplate().update(entity); 3oOr*N3R
} ^~;"$=Wf
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publicvoid delete(finalObject entity){ p/U{*i]t
getHibernateTemplate().delete(entity); !T#EkMM
} P?ms^
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publicObject load(finalClass entity, pft-.1py
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finalSerializable id){ _CMNmmp`e
return getHibernateTemplate().load &/n*>%2
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(entity, id); =NmW}x|n
} P~M[i9 V
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publicObject get(finalClass entity, 63i&<
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finalSerializable id){ T&4f}g/
return getHibernateTemplate().get Z(XohWe2
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(entity, id); nTl2F1(sV7
}
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publicList findAll(finalClass entity){ DL<;qhte
return getHibernateTemplate().find("from #jh5% @
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" + entity.getName()); \(RD5@=!4#
} @QMy!y_K~m
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publicList findByNamedQuery(finalString d_Jj&:"l
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namedQuery){ -p?&vQDo`
return getHibernateTemplate SpImd IpD
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().findByNamedQuery(namedQuery); L6ap|u
} pztfm'
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publicList findByNamedQuery(finalString query, Wb>;L@jB7
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finalObject parameter){ ?5jLN&A3 G
return getHibernateTemplate C5~n^I|
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().findByNamedQuery(query, parameter); 'zbvg0 T
} ?%[~J
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publicList findByNamedQuery(finalString query, "g)V&Lx#X
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finalObject[] parameters){ @TQ/Z$y
return getHibernateTemplate MI'"Xzp{s
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().findByNamedQuery(query, parameters); T@=C2
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} %S"85#R5E
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publicList find(finalString query){ bU}v@Uk
return getHibernateTemplate().find A.Wf6o
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(query); |1"&[ .
} BvsSrse
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publicList find(finalString query, finalObject @,n)1*{P
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parameter){ I`_I^C3
return getHibernateTemplate().find Q"ZpT
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(query, parameter); FGx)?
} e`s1z|h
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public PaginationSupport findPageByCriteria xa@$cxt
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(final DetachedCriteria detachedCriteria){ HWsV_VAw}
return findPageByCriteria 50QDqC-]XS
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); *qm|A{FQR
} Q{|%kU"
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public PaginationSupport findPageByCriteria Cd_@<
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(final DetachedCriteria detachedCriteria, finalint 1oej<67PdJ
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startIndex){ 2+rT .GFc
return findPageByCriteria j*<J&/luYZ
*,4rYb7I w
(detachedCriteria, PaginationSupport.PAGESIZE, 7h}gIm7e"
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startIndex); (|K+1R
} SjB"#E)
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public PaginationSupport findPageByCriteria Qc3d<{7\~
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(final DetachedCriteria detachedCriteria, finalint ~j'D%:[+VH
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pageSize, QQS*r}>
finalint startIndex){ |@u2/U9
return(PaginationSupport) {&n- @$?
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getHibernateTemplate().execute(new HibernateCallback(){ \R<MQ#
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publicObject doInHibernate KVa{;zBwl
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(Session session)throws HibernateException { /P*XB%y
Criteria criteria = wuH*a3(
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detachedCriteria.getExecutableCriteria(session); x"Ky_P~
int totalCount = ;#85 _/
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((Integer) criteria.setProjection(Projections.rowCount O`~#X w
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()).uniqueResult()).intValue(); Mp`$1Ksn
criteria.setProjection [[ie
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(null); l;iU9<~
List items = UH!(`Z\C
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criteria.setFirstResult(startIndex).setMaxResults O`@Nl
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(pageSize).list(); sG`x |%t
PaginationSupport ps = `j>5W<5q\
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new PaginationSupport(items, totalCount, pageSize, F@u7Oel@m
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startIndex); l
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return ps; oVvA`}
} =P(*j7=
}, true); 9lb?%UFe
} x(Bt[=,K3
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public List findAllByCriteria(final FH=2,"A
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DetachedCriteria detachedCriteria){ [[$CtqLg
return(List) getHibernateTemplate '#+&?6 p
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().execute(new HibernateCallback(){ ^lHy)!&A
publicObject doInHibernate z5jw\jBD
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(Session session)throws HibernateException { h$02#(RHJ
Criteria criteria = v6*0@/L
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detachedCriteria.getExecutableCriteria(session); g6,D Bkv2
return criteria.list(); VRd7H.f,A6
} cXb*d|-|N
}, true); 36=aahXd\
} u9!
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public int getCountByCriteria(final 9nG^_.}|
@su<h\)
DetachedCriteria detachedCriteria){ ,#)d
Integer count = (Integer) dbby.%
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getHibernateTemplate().execute(new HibernateCallback(){ 5NhFjPETr
publicObject doInHibernate fmW{c mr|
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(Session session)throws HibernateException { XFS~
Criteria criteria = *JJ8\R&P0
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detachedCriteria.getExecutableCriteria(session); d>p' A_
return _*o<<C\E
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criteria.setProjection(Projections.rowCount (ghI$oH
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()).uniqueResult(); R;OPY?EeW
} Vm%G
q
}, true); `]KX`xGK
return count.intValue(); >$D!mraih
} JWb +
} Z}S[fN8
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用户在web层构造查询条件detachedCriteria,和可选的 6|eqQ+(A
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Rt#QW*h\|i
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PaginationSupport的实例ps。 ( cs
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ps.getItems()得到已分页好的结果集 5&