Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 gv i!|!M=
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 )n[=)"rf
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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 <AP.m4N) _
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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 $Il
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分页支持类: B@ msGb C
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java代码: yf-2E_yB
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package com.javaeye.common.util; P:%b[7
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import java.util.List; g`tV^b")
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publicclass PaginationSupport { Md8<IFi9]Q
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publicfinalstaticint PAGESIZE = 30; )5y"T0]
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privateint pageSize = PAGESIZE; nKI?Sc
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privateList items; m'k>U4
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privateint totalCount; "5?1S-Vl
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privateint[] indexes = newint[0]; xVN!w\0
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privateint startIndex = 0; :JZV=@<T
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public PaginationSupport(List items, int FU.?n)P
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totalCount){ 8!@}\6qM
setPageSize(PAGESIZE); *O\lR-z!k
setTotalCount(totalCount); SUW=-M
setItems(items); x3.,zfWs
setStartIndex(0); 7W5Cm\
} }z|9F(I
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public PaginationSupport(List items, int IS;[oJef
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totalCount, int startIndex){ 9`? M-U
setPageSize(PAGESIZE); V'UFc>{o
setTotalCount(totalCount); PtzT><
setItems(items); 6s
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setStartIndex(startIndex); WT3g31
} X\i;j!;d
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public PaginationSupport(List items, int 1+Ik\
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totalCount, int pageSize, int startIndex){ 0;`+e22
setPageSize(pageSize); Sq:J'%/z
setTotalCount(totalCount); :2')`xT
setItems(items); zE?dQD^OD
setStartIndex(startIndex); 2v#gCou
} Y]uVA`%"b
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publicList getItems(){ s#")hMJQ
return items; D(&WEmm\B
} F~bDg tN3
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publicvoid setItems(List items){ iM6(bmc.
this.items = items; b*{UO
} gr{*wYL
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publicint getPageSize(){ ]<r.{EJ
return pageSize; {zLgLBM
} ^!n|j]aw
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publicvoid setPageSize(int pageSize){ 6:`[Fi
this.pageSize = pageSize; &2O~BIRE
} {K?e6-N(z
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publicint getTotalCount(){ qElPYN*wF
return totalCount; vL^ +X`.td
} RZ ?SiwE
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publicvoid setTotalCount(int totalCount){ ?C
if(totalCount > 0){ ?I"?J/zm
this.totalCount = totalCount; Mm9*$g!R
int count = totalCount / XV`8Vb
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pageSize; oJ/=&c
if(totalCount % pageSize > 0) sBqOcy
count++; VwK7\jV
indexes = newint[count]; , q{~lf-
for(int i = 0; i < count; i++){ 9>`dB
indexes = pageSize * h'_$I4e)
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} { 9\/aXPS
}else{ 2t45/:,
this.totalCount = 0; ^uVPN1}b^@
} b^P\Q s*m
} H\9ePo\b~
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publicint[] getIndexes(){ 036QV M$
return indexes; bqx2lQf,_
} a$bE2'cb
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publicvoid setIndexes(int[] indexes){ +>$Kmy[3
this.indexes = indexes; yUO%@;
} l
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publicint getStartIndex(){ xh!T,|IR
return startIndex; l0g+OMt
} bT|-G2g7Z
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publicvoid setStartIndex(int startIndex){ }nO%q6|\V
if(totalCount <= 0) yT='V1
this.startIndex = 0; \$F#bIjC
elseif(startIndex >= totalCount) HMmVfGp]
this.startIndex = indexes ap"pQ[t;
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[indexes.length - 1]; P4|A\|t
elseif(startIndex < 0) 141xi;o
this.startIndex = 0; g@Y]$ey%A
else{ _g,_G
this.startIndex = indexes HnsLYY\
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[startIndex / pageSize]; HNlW.y"
} $'<$:;4b3
} VRSBf;?
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publicint getNextIndex(){ eYUq0~3
int nextIndex = getStartIndex() + lk
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pageSize; W%o! m,zFM
if(nextIndex >= totalCount) ^<
return getStartIndex(); *Gj`1#Z$
else Ag8lI+
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return nextIndex; :/t_5QN
} 8|5+\1!#/)
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publicint getPreviousIndex(){ C#3&,G W
int previousIndex = getStartIndex() - v!3Oq.ot
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pageSize; c%+uji6
if(previousIndex < 0) R9QW%!:,\2
return0; d5R2J:dI
else h%v qt~0
return previousIndex; mC?}:WM@
} L;+e)I]
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} +[$Td%6
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抽象业务类 4E1j0ARQQ
java代码: T
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/** K5??WB63B
* Created on 2005-7-12 Kq+vAp).
*/ WHfl|e
package com.javaeye.common.business; -_]Ceq/
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import java.io.Serializable; Rd5pLrr[0)
import java.util.List; ^$RpP+d
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import org.hibernate.Criteria; P\z1fscnK
import org.hibernate.HibernateException; =2vZqGO30
import org.hibernate.Session; {BJH}vV1)
import org.hibernate.criterion.DetachedCriteria; #Pg?T%('`
import org.hibernate.criterion.Projections; |It{L0=U
import !d[]Qt%mA
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org.springframework.orm.hibernate3.HibernateCallback; HW"5MZ8E
import s:z
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org.springframework.orm.hibernate3.support.HibernateDaoS .f!:@fX>=
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upport; j)juvat
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import com.javaeye.common.util.PaginationSupport; s!Iinc^p
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public abstract class AbstractManager extends vy>(?[
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HibernateDaoSupport { r]wy-GT
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privateboolean cacheQueries = false; U<'z,Px6
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privateString queryCacheRegion; .v9i|E=<~
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publicvoid setCacheQueries(boolean ?,[$8V
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cacheQueries){ 2(Yt`3Go(
this.cacheQueries = cacheQueries; !MmbwB'
} n:H
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publicvoid setQueryCacheRegion(String kb~ 9/)~g
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queryCacheRegion){ oDGBC
this.queryCacheRegion = F:.8O ,%u
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queryCacheRegion; l
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} DLe>EU;vS
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publicvoid save(finalObject entity){ >km$zfM2-
getHibernateTemplate().save(entity); \rS-}DG
} m+ #G*
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publicvoid persist(finalObject entity){ %0f*OC
getHibernateTemplate().save(entity); [RTo[-ci2
} 6r[pOl:
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publicvoid update(finalObject entity){ cwQ*P$n
getHibernateTemplate().update(entity); 6QP T
} SLvo)`Nc3-
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publicvoid delete(finalObject entity){ 8%MF<
getHibernateTemplate().delete(entity); zNEN[
} t!>0^['g4
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publicObject load(finalClass entity, ogya~/
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finalSerializable id){ i9peQ61{
return getHibernateTemplate().load +hlR
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(entity, id); R m2M
} iA'p!l|P
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publicObject get(finalClass entity, =H}}dC<)
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finalSerializable id){ DnF|wS
return getHibernateTemplate().get -YipPo"a
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(entity, id); CdtwR0
} ^6!8)7b
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publicList findAll(finalClass entity){ %fh-x(4v
return getHibernateTemplate().find("from Cth<x n(Q
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" + entity.getName()); -,$:^4
} .ffr2\'*
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publicList findByNamedQuery(finalString V:AA{<
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namedQuery){ ]Rmu+N|
return getHibernateTemplate KkR.p,/
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().findByNamedQuery(namedQuery); ;N
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} oV~S4|9:
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publicList findByNamedQuery(finalString query, 4@M}5WJ7
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finalObject parameter){ Nk9w;
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return getHibernateTemplate aZta%3`)
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().findByNamedQuery(query, parameter); l@@qpaH
} ) LBbA
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publicList findByNamedQuery(finalString query, q+XU Cnv
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finalObject[] parameters){ Jd33QL}Hj
return getHibernateTemplate of`WP
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().findByNamedQuery(query, parameters); hXx:D3h
} a1v?{vu\E
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publicList find(finalString query){ \@6V{y'Zo
return getHibernateTemplate().find 8BnsYy)j
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(query); A5G@u}YS5
} hCj8y.X|E(
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publicList find(finalString query, finalObject ~jC$C2A0
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parameter){ ZP.~Y;Ch;-
return getHibernateTemplate().find u>2opI~m
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(query, parameter); '5 9{VA6h
} qp/nWGj
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public PaginationSupport findPageByCriteria #5^S@}e
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(final DetachedCriteria detachedCriteria){ >5Sm.7}R
return findPageByCriteria Q1DiEg
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); `Z
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} p.vxrk`c
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public PaginationSupport findPageByCriteria F[0w*i&u5
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(final DetachedCriteria detachedCriteria, finalint SCq3Kh
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startIndex){ b.xG'
return findPageByCriteria "s\himoa
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(detachedCriteria, PaginationSupport.PAGESIZE, H*&!$s.
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startIndex); ESkhCDU
} U
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public PaginationSupport findPageByCriteria 2K{)8;^
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(final DetachedCriteria detachedCriteria, finalint ,.uI>
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pageSize, v+d? #^
finalint startIndex){ MAgoxq~;V
return(PaginationSupport) -qB{TA-.\
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getHibernateTemplate().execute(new HibernateCallback(){ 3MHByT%
publicObject doInHibernate R=L-Ulhk
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(Session session)throws HibernateException { ET~^P
Criteria criteria = E, |OMK#
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detachedCriteria.getExecutableCriteria(session); K`kWfPwp
int totalCount = .wcKG9u
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((Integer) criteria.setProjection(Projections.rowCount ? UBE0C
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()).uniqueResult()).intValue(); p@+D$
criteria.setProjection eg>]{`WQ
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(null); ztV%W6
List items = ^FK-e;J
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criteria.setFirstResult(startIndex).setMaxResults 2S-z$Bi}]
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(pageSize).list(); ?"T *{8
PaginationSupport ps = Cvtz&dH
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new PaginationSupport(items, totalCount, pageSize, R|!4klb
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startIndex); |Q#CQz
return ps; 6b h.5|
} e|.a%,Dcy
}, true); * l-F
} l gTw>r
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public List findAllByCriteria(final ?4lEHef
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DetachedCriteria detachedCriteria){ Hr=?_Un"
return(List) getHibernateTemplate x7c#kU2A&Z
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().execute(new HibernateCallback(){ Ny 7vId
publicObject doInHibernate ^xF-IA#ZeB
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(Session session)throws HibernateException { lC=T{rR
Criteria criteria = 8"J6(KS
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detachedCriteria.getExecutableCriteria(session); u!I=|1s
return criteria.list(); O3(H_(P
} wZ~eE'zx+
}, true); nbSu|sX~r5
} `5t
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public int getCountByCriteria(final !FbW3p f
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DetachedCriteria detachedCriteria){ z6bIv}
Integer count = (Integer) #|acRZ9
}
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getHibernateTemplate().execute(new HibernateCallback(){ $R/@%U)-o
publicObject doInHibernate WD?COUEox
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(Session session)throws HibernateException { p`oHF 5
Criteria criteria = &uG@I=}TIY
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detachedCriteria.getExecutableCriteria(session); *&rV}vVP^
return 5@{~830
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criteria.setProjection(Projections.rowCount B7nm7[V
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()).uniqueResult(); O}q(2[*i
} oJVpJA0IA
}, true); t3;QF
return count.intValue(); Hp-vBoEk
} '8UhYwyr
} to;cF6X
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用户在web层构造查询条件detachedCriteria,和可选的 MHAWnH8
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 7>yb8/J
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PaginationSupport的实例ps。 &%` 0&y
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ps.getItems()得到已分页好的结果集 SI/p8 ^
ps.getIndexes()得到分页索引的数组 T+)#Du
ps.getTotalCount()得到总结果数 9l:vVp7Uk
ps.getStartIndex()当前分页索引 TDHS/"MbA7
ps.getNextIndex()下一页索引 $ D(q
ps.getPreviousIndex()上一页索引 4F?O5&329i
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5:X^Q.f;
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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 1F94e)M)"
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一下代码重构了。 84M*)cKR~
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我把原本我的做法也提供出来供大家讨论吧: F48W8'un
9Gk#2
首先,为了实现分页查询,我封装了一个Page类: -v62 s
java代码: '7>Yrzq
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/*Created on 2005-4-14*/ ,(&