Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 )XcOl7XLN
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ^j-3av=
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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 ^WBuMCe
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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 5p.rwNE
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分页支持类: P) 3mX.(}
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java代码: [q !TIq
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package com.javaeye.common.util; (=~&+z
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import java.util.List; ,^#yo6-
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publicclass PaginationSupport { #9K-7je;j
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publicfinalstaticint PAGESIZE = 30; 3Zi@A4Wu
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privateint pageSize = PAGESIZE; -B86U6^s
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privateList items; V5*OA??k<
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privateint totalCount; Y ')x/H
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privateint[] indexes = newint[0]; !%$`Eq)M^7
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privateint startIndex = 0; L:@7tc.
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public PaginationSupport(List items, int pb~pN
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totalCount){ K tNY_&xd
setPageSize(PAGESIZE); j~*L~7
setTotalCount(totalCount); W.kM7z>G
setItems(items); / X1 x
setStartIndex(0); _a1x\,R|DB
} N<~ku<nAU
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public PaginationSupport(List items, int F_CYYGZ
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totalCount, int startIndex){ JQ"U4GVp
setPageSize(PAGESIZE); ~6p[El#tS
setTotalCount(totalCount); JH7<
setItems(items); &RfC"lc
setStartIndex(startIndex); ocs+d\
} ynbuN x*
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public PaginationSupport(List items, int ~?(N
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totalCount, int pageSize, int startIndex){ F i0GknQ+
setPageSize(pageSize); EAM5{Nc
setTotalCount(totalCount); I'LnI*
setItems(items); .0es3Rj
setStartIndex(startIndex); irfp!(r
} 9Q"'"b*?z
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publicList getItems(){ [sW3l:^
return items; |j7,Mu+
} b9l;a+]d
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publicvoid setItems(List items){ fZoHf\B]{
this.items = items; jbAx;Xt'=M
} OynXkH]0T+
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publicint getPageSize(){ vd[0X;
return pageSize; 4M2j!Sw
} *6>.!&
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publicvoid setPageSize(int pageSize){ 76`8=!]R
this.pageSize = pageSize; .4E&/w+
} .nVa[B|.
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publicint getTotalCount(){ -X"p:=;j
return totalCount; cH&J{WeZa
} -[wGX}}
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publicvoid setTotalCount(int totalCount){ ;<ZLcTL
if(totalCount > 0){ S Em Q@1
this.totalCount = totalCount; |AozR ~
int count = totalCount / h%uZYsK
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pageSize; y]f"@9G#
if(totalCount % pageSize > 0) 2I,^YWR
count++; 9J2NH|]c
indexes = newint[count]; ++^l]8
for(int i = 0; i < count; i++){ c_4[e5z
indexes = pageSize * r/u A.Aou^
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} ;;#qmGoE
}else{ )% ~OH
this.totalCount = 0; a m|F?|1
} 73/P&hT
} *Qg _F6y
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publicint[] getIndexes(){ f}9zgWU
return indexes; f,kZ\Ia'r
} vzim<;i
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publicvoid setIndexes(int[] indexes){ !1$])VQWI
this.indexes = indexes; 4b98KsYg
} $\X[@E S0
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publicint getStartIndex(){ rustMs2p
return startIndex; Z$/xy"
} o!kbK#k
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publicvoid setStartIndex(int startIndex){ SAy=WV
if(totalCount <= 0) e&&53?
this.startIndex = 0; {y=j?lD
elseif(startIndex >= totalCount) K/IWH[
this.startIndex = indexes wk5s)%V
Ab{ K<:l
[indexes.length - 1]; W04@!_) <
elseif(startIndex < 0) ahJ`$U4n
this.startIndex = 0; n>BkTaI
else{ Uq^#r iq
this.startIndex = indexes zh8nc%X{
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[startIndex / pageSize]; [XEkz#{
} ;DFSzbF`
} 21K>`d\
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publicint getNextIndex(){ ,-8"R`UI8
int nextIndex = getStartIndex() + DtXrWS/
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pageSize; g?z/2zKR
if(nextIndex >= totalCount) 3G}x;Cp\D
return getStartIndex(); Rwz0poG`WG
else *U&0<{|T
return nextIndex; :~Wrf8UQ
} L^@'q6*}
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publicint getPreviousIndex(){ J}v}~Cv
int previousIndex = getStartIndex() - }dgfqq
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pageSize; c;Pe/ d
if(previousIndex < 0) 7z JRJ*NB
return0; ^c-
else p<2L.\6"
return previousIndex; 2^h27A
} <m)$K
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} kMi/>gpQ
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}B\a<0L/
抽象业务类 X' H[7 ^W
java代码: RJ 8+h
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/** I*{4rDt
* Created on 2005-7-12 ,':fu
*/
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package com.javaeye.common.business; xS4w5i2
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import java.io.Serializable; 3!XjtVhK?I
import java.util.List; $q6BP'7
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import org.hibernate.Criteria; )h"<\%LU
import org.hibernate.HibernateException; 8!O5quEc
import org.hibernate.Session; eKE#Yr
d=x
import org.hibernate.criterion.DetachedCriteria; $WyD^|~SF
import org.hibernate.criterion.Projections; Qu?R8+"KS
import e6@=wnoX u
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org.springframework.orm.hibernate3.HibernateCallback; O#:$^#j&
import \F1_lq;K
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org.springframework.orm.hibernate3.support.HibernateDaoS k1w_[w[
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upport; i2E)P x
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import com.javaeye.common.util.PaginationSupport; 60P#,o@G
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public abstract class AbstractManager extends zM bN;tu
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HibernateDaoSupport { 7Ri46Tkt
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privateboolean cacheQueries = false; ~
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privateString queryCacheRegion; R;s?$;I
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publicvoid setCacheQueries(boolean ")O%86_Q:
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cacheQueries){ |n+qMql'
this.cacheQueries = cacheQueries; "?]{%-u
} LJd5;so-
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publicvoid setQueryCacheRegion(String LLk(l#K*
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queryCacheRegion){ o3Yb7h9
this.queryCacheRegion = e-:yb^
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queryCacheRegion; |L%Z,:yO
} ?5C!<3gM)
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publicvoid save(finalObject entity){ V=R 3)GC
getHibernateTemplate().save(entity); :[wsKFaV+
} +o\:d1y
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publicvoid persist(finalObject entity){ [B+yyBtx
getHibernateTemplate().save(entity); JJP08oP
} S>h;K`
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publicvoid update(finalObject entity){ 'n{Nvt.c
getHibernateTemplate().update(entity); +c(zo4nZ
} ^T*? >%`
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publicvoid delete(finalObject entity){ Ov5"
getHibernateTemplate().delete(entity); w`4=_J=GO
} 7E!IF>`
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publicObject load(finalClass entity, rf
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finalSerializable id){ Li!Vx1p;u.
return getHibernateTemplate().load )m`<H>[Eb=
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(entity, id); vMA]j>>
} wN@oYFoL
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publicObject get(finalClass entity, 'Q|M'5'
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finalSerializable id){ 1pt%Kw*@j
return getHibernateTemplate().get _wTOmz%|R
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(entity, id); C<NLE-
} oC<.=2]
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publicList findAll(finalClass entity){ f$+,HB
return getHibernateTemplate().find("from 9{RB{<Se!
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" + entity.getName()); I9/W;#
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} -&NN51-d\j
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publicList findByNamedQuery(finalString Lx\8Z=
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namedQuery){ J3e96t~u
return getHibernateTemplate N*"p|yhd]
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().findByNamedQuery(namedQuery); j}%ja_9S
} 0xxg|;h.,g
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publicList findByNamedQuery(finalString query, c9HrMgW
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finalObject parameter){ <oR a3Gi(%
return getHibernateTemplate k[bD\'
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().findByNamedQuery(query, parameter); JW{rA6?
} q)Lu_6 mg
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publicList findByNamedQuery(finalString query,
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finalObject[] parameters){ GC?ON0g5s
return getHibernateTemplate rm5bkJcg~
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().findByNamedQuery(query, parameters); ",^Mxm{
} 419x+3>}
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publicList find(finalString query){ ?j40}
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return getHibernateTemplate().find oI=fx Sjd
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(query); q@Zn|NR
} 9f2UgNqe9
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publicList find(finalString query, finalObject >hPQRd
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parameter){ fI{E SXU
return getHibernateTemplate().find Rtb7|
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(query, parameter); ,24p%KJ*X
} {{B%f.
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public PaginationSupport findPageByCriteria q#T/
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(final DetachedCriteria detachedCriteria){ gG]Eeu+z
return findPageByCriteria H| 8Qp*
$K]m{
(detachedCriteria, PaginationSupport.PAGESIZE, 0); Z1 Bp+a3
} 6A>dhU
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public PaginationSupport findPageByCriteria byLft1
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(final DetachedCriteria detachedCriteria, finalint oE+R3[D?r
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startIndex){ <}E!w_yi
return findPageByCriteria .ni_p 6!
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(detachedCriteria, PaginationSupport.PAGESIZE, ba[1wFmcL
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startIndex); +?:7O=Y
} I,0q4
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public PaginationSupport findPageByCriteria V#XppYU
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(final DetachedCriteria detachedCriteria, finalint b\3Oyp>
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pageSize, ht2\ y&si
finalint startIndex){ AfX}y+Ah
return(PaginationSupport) O_ChxX0KP
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getHibernateTemplate().execute(new HibernateCallback(){ -*$HddD
publicObject doInHibernate L\@I*QP
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(Session session)throws HibernateException { n;@bLJ$W
Criteria criteria = fDT%!
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detachedCriteria.getExecutableCriteria(session); VKq=7^W
int totalCount = :pGaFWkvO
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((Integer) criteria.setProjection(Projections.rowCount o=50>$5jlS
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()).uniqueResult()).intValue(); .@(6 Y<dN
criteria.setProjection cd(GvX'
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(null); ~F4fFQ-yy
List items = E~]R2!9
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criteria.setFirstResult(startIndex).setMaxResults pi
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(pageSize).list(); w2
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PaginationSupport ps = \HKxh:F'
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new PaginationSupport(items, totalCount, pageSize, 5Ow[~p"l<
vR s,zL$W
startIndex); hp#W9@NR
return ps; t=Xv;=daB
} |y0(Q V
}, true); M_"L9^^>N
} q1QL@Ax
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public List findAllByCriteria(final l038%U~U!
h| ,:e;>}
DetachedCriteria detachedCriteria){ 6LalW5I
return(List) getHibernateTemplate P(+&OoY2
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().execute(new HibernateCallback(){ n?- })
publicObject doInHibernate \Ta"}TF8
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(Session session)throws HibernateException { 3BtaH#ZY
Criteria criteria = bn!HUM,
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detachedCriteria.getExecutableCriteria(session); H."EUcE{
return criteria.list(); d-k%{eBV
} SKkUU^\#R`
}, true); nEJY5Bz$
} n2)@S0{
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public int getCountByCriteria(final BW 4%l
9{
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DetachedCriteria detachedCriteria){ .^h#_[dp
Integer count = (Integer) y#U+c*LB
D;;!ODX$?
getHibernateTemplate().execute(new HibernateCallback(){ yXHUJgjl/
publicObject doInHibernate 0:9.;x9_
]Q>.HH
(Session session)throws HibernateException { ioYGZ%RG#
Criteria criteria = !bN*\c
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detachedCriteria.getExecutableCriteria(session); +RyjF~[e
return VXR>]HUF
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criteria.setProjection(Projections.rowCount CF?1R
(O.d>
()).uniqueResult(); C~o7X^[R\
} j)<IRD^
}, true); >zXsNeGQR
return count.intValue(); &6ZD136
} BYVY)<v/
} q,93nhs "
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" @v <Bk
用户在web层构造查询条件detachedCriteria,和可选的 p<,*3huj
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 1*9U1\z
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PaginationSupport的实例ps。 L"o>wYx
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ps.getItems()得到已分页好的结果集 B?'#4J
ps.getIndexes()得到分页索引的数组 =;2%a(
ps.getTotalCount()得到总结果数 MP_ ~<Q
ps.getStartIndex()当前分页索引 ;C3US)j
ps.getNextIndex()下一页索引 VGpWg rmHk
ps.getPreviousIndex()上一页索引 -jb0o/:
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 amOnqH-(
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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 !cO]<