Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 7\*FEjRM]
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 `qd+f{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 N]KxAttt
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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 !T](Udf
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分页支持类: HB
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java代码: E0`Lg
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package com.javaeye.common.util; ~QvqG{bFB
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import java.util.List; /axIIfx-
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publicclass PaginationSupport { CR6R?R3b
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publicfinalstaticint PAGESIZE = 30; dCj,b$
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privateint pageSize = PAGESIZE; F(t=!k,4\
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privateList items; nLV9<M
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privateint totalCount; \GHiLs,!
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privateint[] indexes = newint[0]; <7-J0btV
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privateint startIndex = 0; detwa}h[0
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public PaginationSupport(List items, int rj6#1kt
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totalCount){ ;j4?>3
setPageSize(PAGESIZE); l x,"EOP
setTotalCount(totalCount); meOMq1
setItems(items); eds26(
setStartIndex(0); rk)##)
} +[5.WC7J
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public PaginationSupport(List items, int 8T(e.I
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totalCount, int startIndex){ It{ ;SKeo
setPageSize(PAGESIZE); =zyC-;r!
setTotalCount(totalCount); `[C!L *#,
setItems(items); 3> Y6)
setStartIndex(startIndex); /%Nr?V
} }g4 M2|
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public PaginationSupport(List items, int =+AS/Jq
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totalCount, int pageSize, int startIndex){ n_'s=] ~
setPageSize(pageSize); WD1G&5XP
setTotalCount(totalCount); IEU^#=n
setItems(items); P3oI2\)*i
setStartIndex(startIndex); L:9F:/G
} sqW*
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publicList getItems(){ YX`7Hm,
return items; F4K0);
}
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publicvoid setItems(List items){ i\dc>C ;
this.items = items; *V+j%^91}
} Kw#i),M
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publicint getPageSize(){ ;$z$@@WC
return pageSize; f4BnX(1u
} DZ_lW
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publicvoid setPageSize(int pageSize){ 9ksE>[7
this.pageSize = pageSize; 8H_l:Z [:i
} ;g~TWy^o
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publicint getTotalCount(){ N&M~0iw
return totalCount; }X=[WCKU
} . Z%{'CC
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publicvoid setTotalCount(int totalCount){ 0lv%`,
if(totalCount > 0){ Hbpqyl%O>
this.totalCount = totalCount; Ovj^IjG-`
int count = totalCount / Jm42b4
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pageSize; =dFv/F/RW
if(totalCount % pageSize > 0) MX@_=Sp-
count++; xl#LrvxI
indexes = newint[count]; q#8 [
for(int i = 0; i < count; i++){ &cu lbcz
indexes = pageSize * g]c 6&Y,#
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} 4!LCR}K
}else{ l'3pQ;
this.totalCount = 0; xQ@^$_
} M6}3wM*4
} beu\cV3
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publicint[] getIndexes(){ u5Ftu?t
return indexes; dX)GPC-D7
} M-giR:,
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publicvoid setIndexes(int[] indexes){ L*~J%7
this.indexes = indexes; OdB?_.+$
} Lg+G; W
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publicint getStartIndex(){ R<=zCE `:
return startIndex; `4~H/'%QB
} YE9,KVV;$n
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publicvoid setStartIndex(int startIndex){ Qu]z)";7
if(totalCount <= 0) |lkNi
this.startIndex = 0; >J>b>SU=-
elseif(startIndex >= totalCount) 1hziXC0WY
this.startIndex = indexes I:d[Q
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[indexes.length - 1]; %C=]1Q=T)
elseif(startIndex < 0) =%>oR
this.startIndex = 0; *7wAkljP
else{ [mPjP%{=@
this.startIndex = indexes >z.<u|r2
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[startIndex / pageSize]; 4X*>H
} m:/wG&
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} $VxA0
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publicint getNextIndex(){ Co3:*nbRv
int nextIndex = getStartIndex() + 8{Fsm;UsY
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pageSize; w#g#8o>'
if(nextIndex >= totalCount) Yp:KI7
return getStartIndex(); A4]s~Ur
else {pHM},WJ
return nextIndex; 7ek&[SJ>,/
} g{P%s'%*
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publicint getPreviousIndex(){ gB4U*D0[e~
int previousIndex = getStartIndex() - tyDM'|p
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pageSize; ^'ryNa;"
if(previousIndex < 0) +(+Itmx2&
return0; uZ=NSbYsA
else <$hu
return previousIndex; G7CG~:3h+
} _{ZqO;[u
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} nw6+.pOy
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抽象业务类 8zBWIi
java代码: +/ &_v^sC;
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/** 5j-]EJb
* Created on 2005-7-12 &EpAg@9!
*/ Vy|6E#U
package com.javaeye.common.business; HyR!O>
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import java.io.Serializable; T t>8?
import java.util.List; )<xypDQ
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import org.hibernate.Criteria; <u=4*:QE
import org.hibernate.HibernateException; _Um d
import org.hibernate.Session; {$1J=JbE
import org.hibernate.criterion.DetachedCriteria; G\a8B#hg
import org.hibernate.criterion.Projections; r
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import #"49fMi/
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org.springframework.orm.hibernate3.HibernateCallback; +GAf O0
import RO3oP1@B
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org.springframework.orm.hibernate3.support.HibernateDaoS /CIh2
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upport; \))=gu)I
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import com.javaeye.common.util.PaginationSupport; w2xG_q
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public abstract class AbstractManager extends 8#&q$kE
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HibernateDaoSupport { NOS>8sy
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privateboolean cacheQueries = false; cGwf!hA
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privateString queryCacheRegion; wap3Kd>MP
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publicvoid setCacheQueries(boolean oW;6h.
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cacheQueries){ v0 Ir#B,[H
this.cacheQueries = cacheQueries; J/6`oh?,Q
} WGAXIQ
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publicvoid setQueryCacheRegion(String U'*t~x<
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queryCacheRegion){ x^*1gv $o
this.queryCacheRegion = Xo {`]
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queryCacheRegion; ,Os? f:Y6
} bOI3^T
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publicvoid save(finalObject entity){ gip/(/NX
getHibernateTemplate().save(entity); ]P[%Mhg^
} z5]bia,
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publicvoid persist(finalObject entity){ T$=4O9G
getHibernateTemplate().save(entity); j!z-)p8hy
} _#_
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publicvoid update(finalObject entity){ ~np,_yI
getHibernateTemplate().update(entity); 8Q)@
} \/|)HElKR
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publicvoid delete(finalObject entity){ =xianQ<lK
getHibernateTemplate().delete(entity); jKIc09H|
} 8p1ziz`4>$
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publicObject load(finalClass entity, Fd\e*ww'
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finalSerializable id){ z{]?h cY
return getHibernateTemplate().load #2xSyOrmf
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(entity, id); j*;N\;iL!*
} M*pRv
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publicObject get(finalClass entity, c3
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finalSerializable id){ eXl=i-'
return getHibernateTemplate().get #:ns64|
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(entity, id); 8X&Ya =
} hF&}lPVtv
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publicList findAll(finalClass entity){ m|svQ-/j
return getHibernateTemplate().find("from 4-v6=gz.
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" + entity.getName()); ?PPZp6A3L=
} tu%[p 4
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publicList findByNamedQuery(finalString {b!7
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namedQuery){ 'i>xf
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return getHibernateTemplate YTyX`Y#
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().findByNamedQuery(namedQuery); :wgfW .w
} PoD^`()FR{
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publicList findByNamedQuery(finalString query, .\5$MIF
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finalObject parameter){ {8NwFN.
return getHibernateTemplate Ygkv7>?,
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().findByNamedQuery(query, parameter); )fh0&Y; R
} ;rBp1[qVe
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publicList findByNamedQuery(finalString query, =3ADT$YHd
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finalObject[] parameters){ W8aU"_
return getHibernateTemplate RIhOR8)
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().findByNamedQuery(query, parameters); y@apJ;_R-
} J4yt N3
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publicList find(finalString query){ d5U; $q{o
return getHibernateTemplate().find ^,7=X8Su
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(query); e.X@] PQJQ
} kX8=cL9G
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publicList find(finalString query, finalObject O{n<WQd{CY
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parameter){ &=-PRza%j
return getHibernateTemplate().find S;}qLjT
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(query, parameter); Bxv8RB
} 4r*Pa(;y
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public PaginationSupport findPageByCriteria QHQj/)J8
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(final DetachedCriteria detachedCriteria){ "=A|K~b
return findPageByCriteria R{<Y4C2~
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); !0dX@V'r
} :QKb#4/8;
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public PaginationSupport findPageByCriteria $-w5o`e
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(final DetachedCriteria detachedCriteria, finalint X>/K/M
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startIndex){ r{V.jZ%p'Z
return findPageByCriteria 9cOx@c+/
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(detachedCriteria, PaginationSupport.PAGESIZE, #HDesen
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startIndex); {]M>Y%j48
} 6J;i,/ky
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public PaginationSupport findPageByCriteria irmwc'n]
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(final DetachedCriteria detachedCriteria, finalint xPvRQ
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pageSize, Y^5"qd|`
finalint startIndex){ MHNe>C-!q
return(PaginationSupport) =~$U^IsWA
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getHibernateTemplate().execute(new HibernateCallback(){ +_-Y`O!Q
publicObject doInHibernate gA"<MI'y
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(Session session)throws HibernateException { [,nfAY
Criteria criteria = 9C>ynH
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detachedCriteria.getExecutableCriteria(session); 1!f2*m
int totalCount = rr)9Y][l}
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((Integer) criteria.setProjection(Projections.rowCount EaCZx
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()).uniqueResult()).intValue(); 1>yha
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criteria.setProjection ^
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(null); 8k%H[Smn:
List items = bCt_yR
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criteria.setFirstResult(startIndex).setMaxResults fX""xTNPi
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(pageSize).list(); ,?fN#gc :
PaginationSupport ps = /Q]:Uf.J
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new PaginationSupport(items, totalCount, pageSize, 7_1W:-A7W
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startIndex); {QW-g
return ps; b%<16 4i
} G u6[{u
}, true); o\:$V
} n~9 i^
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public List findAllByCriteria(final *WD;C0?z
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DetachedCriteria detachedCriteria){ /!:L7@BZ
return(List) getHibernateTemplate |z ]aa
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().execute(new HibernateCallback(){ ws.?cCTpt
publicObject doInHibernate .Dc28F~t
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(Session session)throws HibernateException { m\/>C|f\
Criteria criteria = Tln9q0"W
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detachedCriteria.getExecutableCriteria(session); `B:B7Cpvn
return criteria.list(); 'n>EEQyp'
} >pN;J)H
}, true); Al=(sHc'
} uAc@ Z-
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public int getCountByCriteria(final s bs[=LW4
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DetachedCriteria detachedCriteria){ RfD{g"]y
Integer count = (Integer) /rn"
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getHibernateTemplate().execute(new HibernateCallback(){ Zlr{L]c
publicObject doInHibernate j!6elzg
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(Session session)throws HibernateException { w 9/nVu
Criteria criteria = :U!'U;uQ
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detachedCriteria.getExecutableCriteria(session); ?s1u#'aO
return XulaPq
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criteria.setProjection(Projections.rowCount q-A`/9
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()).uniqueResult(); J'I1,5(
} Lhl$w'r
}, true); av'd%LZP
return count.intValue(); s"pR+)jf1D
} Oqd"0Qt-
} #;wkr))
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用户在web层构造查询条件detachedCriteria,和可选的 #H'sZv
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 6V.awg,
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PaginationSupport的实例ps。 qk_p}l-F1
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ps.getItems()得到已分页好的结果集 } l :mN
ps.getIndexes()得到分页索引的数组 f28gE7Y\a
ps.getTotalCount()得到总结果数 u@GRN`yn
ps.getStartIndex()当前分页索引 B, QC-Tn
ps.getNextIndex()下一页索引 dNR7e
ps.getPreviousIndex()上一页索引 }9L 40)8
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