Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 hWt_}'
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Jj]<SWh
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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 '{,JuX"n
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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 dU-:#QV6
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分页支持类: GNW$:=0u
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java代码: w8+phN(-M
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package com.javaeye.common.util; =4)8a"7#.
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import java.util.List; [ (Y@
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publicclass PaginationSupport { @w33u^
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publicfinalstaticint PAGESIZE = 30; p!E*ANwX
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privateint pageSize = PAGESIZE; M7qg\1L
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privateList items; k6 OO\=
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privateint totalCount; {U9{*e$=
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privateint[] indexes = newint[0]; vmxS^_I
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privateint startIndex = 0; ]Y,V)41gCE
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public PaginationSupport(List items, int +^J&x>5
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totalCount){ zq5N@dF
setPageSize(PAGESIZE); 6oWFj eZ0
setTotalCount(totalCount); C|
setItems(items); cm!vuoB~~
setStartIndex(0); iJZvVs',
} * k\;G?
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public PaginationSupport(List items, int hB'rkjt
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totalCount, int startIndex){ 2x gk$E$ 7
setPageSize(PAGESIZE); 5> 81Vhc,
setTotalCount(totalCount); Z%sTj6Th
setItems(items); P{RGW.Ci@
setStartIndex(startIndex); k(`> (w
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public PaginationSupport(List items, int k-4z2qB
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totalCount, int pageSize, int startIndex){ 87pu\(,'
setPageSize(pageSize); 7iy 2V;}
setTotalCount(totalCount); Us[F@
setItems(items); 6Po{tKU
setStartIndex(startIndex); asW
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} akj#.aYk
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publicList getItems(){ $LBgBH&z
return items; t%y
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} Yl1l$[A$
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publicvoid setItems(List items){ 4<EC50@.
this.items = items; "6~+-_:
} =BD|uIR
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publicint getPageSize(){ IUWJi\,
return pageSize; k/Urz*O
} B0g?!.#23
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publicvoid setPageSize(int pageSize){ \+
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this.pageSize = pageSize; juWbd|ad"
} ?>R(;B|ER
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publicint getTotalCount(){ C
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return totalCount; 1vh[sKv9%
} >2'A~?%
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publicvoid setTotalCount(int totalCount){ &[|Z2}
if(totalCount > 0){ B90fUK2g
this.totalCount = totalCount; {\h:k\k
int count = totalCount / &`'@}o>2
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pageSize; wgQx.8 h>
if(totalCount % pageSize > 0) :VR%I;g ;
count++; f]Zj"Tt-
indexes = newint[count]; Yru,YA
for(int i = 0; i < count; i++){ *aYuuRx
indexes = pageSize * 6ZXRb
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} ;e2D}
}else{ .8|"@
this.totalCount = 0; qP9`p4c8i
} b$/7rVH!
} y?iW^>|?L=
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publicint[] getIndexes(){ s?9`dv}P
return indexes; /.UISArH
} S2
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publicvoid setIndexes(int[] indexes){ )ItW}1[I
this.indexes = indexes; nx!+:P ,
} T#}"?A|
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publicint getStartIndex(){ Jg&f.
return startIndex; U*BI/wZ
} $GD
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publicvoid setStartIndex(int startIndex){ usU6,
if(totalCount <= 0) %mS>v|
this.startIndex = 0; MMQ\V(C
elseif(startIndex >= totalCount) z>*\nomOn=
this.startIndex = indexes TQpR'
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[indexes.length - 1]; )'/xNR
elseif(startIndex < 0) (Kw%fJT
this.startIndex = 0; {P ==6/<2o
else{ 5',&8
this.startIndex = indexes .07kG]
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[startIndex / pageSize]; rwpH9\GE
} :?gp}.
} t&o&gb
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publicint getNextIndex(){ P(p|NRD@1
int nextIndex = getStartIndex() + Nm#[ A4
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pageSize; ka$la;e3
if(nextIndex >= totalCount) 1/=6s5vS}
return getStartIndex(); e=ry_@7
else 0J.]`kR
return nextIndex; |-]'~@~
} !3ji]q;uF
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publicint getPreviousIndex(){ ]_m(q`_
int previousIndex = getStartIndex() - 4SIS#m
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pageSize; q3u:Tpn4%
if(previousIndex < 0) k P=~L=cK
return0; `cFNO:
else g9F?j
return previousIndex; iG{xDj{CKv
} #a 4X*X.8c
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} I9sQPa
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抽象业务类 .6pVt_f0/
java代码: V+$fh2t
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/** =AX"'q
* Created on 2005-7-12 j^m pkv<P
*/ H6MG5f_
package com.javaeye.common.business; GjX6noqT
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import java.io.Serializable; )D7/[zb^
import java.util.List; @lCyH(c%
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import org.hibernate.Criteria; 9bUFxSH
import org.hibernate.HibernateException; +6(\7?
import org.hibernate.Session; ;y-sd?pAk
import org.hibernate.criterion.DetachedCriteria; |0VZ1{=*
import org.hibernate.criterion.Projections; +-Z `v
import Bh65qHQO
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org.springframework.orm.hibernate3.HibernateCallback; rs0Wy
import lB
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org.springframework.orm.hibernate3.support.HibernateDaoS Lwo9s)j<e
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upport; 6P02=
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import com.javaeye.common.util.PaginationSupport; !WTL:dk
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public abstract class AbstractManager extends :c9 H2
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HibernateDaoSupport { |Zdl[|kX
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privateboolean cacheQueries = false; 5I/lF oy7
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privateString queryCacheRegion; ,k}(]{ -
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publicvoid setCacheQueries(boolean G|z%T`!U1;
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cacheQueries){ V}Ce3wgvA
this.cacheQueries = cacheQueries; FQ u c}A
} *eMMfxFl
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publicvoid setQueryCacheRegion(String c6VyF=2q
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queryCacheRegion){ 8;x0U`}Ez(
this.queryCacheRegion = T _fM\jdI
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queryCacheRegion; _[/#t|I}
} !gJw?(8"
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publicvoid save(finalObject entity){ m%s:4Z%=
getHibernateTemplate().save(entity); ~re~Ys
} f'TEua_`
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publicvoid persist(finalObject entity){ P7$/yBI U
getHibernateTemplate().save(entity); dd*p_4;
} b8glZb*$
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publicvoid update(finalObject entity){ =X7_!vSv
getHibernateTemplate().update(entity); 4B)%I`
} gmZ] E45
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publicvoid delete(finalObject entity){ kq@~QI?9
getHibernateTemplate().delete(entity); Zr[B*1,ZV
} `i<Z<
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publicObject load(finalClass entity, ~EU\\;1Rmq
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finalSerializable id){ .aR9ulS
return getHibernateTemplate().load ^,aI2vC
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(entity, id); me-uPm
} ilAhw4A
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publicObject get(finalClass entity, ^9kx3Pw?8
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finalSerializable id){ lSc=c-iOv
return getHibernateTemplate().get mv^X{T
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(entity, id); bP> Kx-%q
} K~B
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publicList findAll(finalClass entity){ l>KkAA
return getHibernateTemplate().find("from $lq.*UQ;0
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" + entity.getName()); 4u+0 )<
} =[LorvX+
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publicList findByNamedQuery(finalString 5JHEBw5W%
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namedQuery){ !#=3>\np+X
return getHibernateTemplate P^tTg
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().findByNamedQuery(namedQuery); l qKj;'
} !-%XrU8o3
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publicList findByNamedQuery(finalString query, 72 |O&`O
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finalObject parameter){ )]s<Czm%
return getHibernateTemplate x0WinLQ
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().findByNamedQuery(query, parameter); A+3SLB
} ~clX2U8u`
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publicList findByNamedQuery(finalString query, C511hbF
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finalObject[] parameters){ O1bW, n(
return getHibernateTemplate ;lvcg)}l
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().findByNamedQuery(query, parameters); uxB`
} Fk^N7EJ:$
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publicList find(finalString query){ }>d
return getHibernateTemplate().find }}i'8
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(query); *} ?
} n,2
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publicList find(finalString query, finalObject mEsb_3?#+
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parameter){ |`t 6lVO,Z
return getHibernateTemplate().find X%3?sH
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(query, parameter); Tjhy@3
} cR_ pC
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public PaginationSupport findPageByCriteria OF+4Mq
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(final DetachedCriteria detachedCriteria){ 9)NKI02M|
return findPageByCriteria XbB(<\0+
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); }\Rmwm-
} T7^;!;i`X
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public PaginationSupport findPageByCriteria %^L{K[}
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(final DetachedCriteria detachedCriteria, finalint ,(pp+hNq
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startIndex){ -(]CFnD_N
return findPageByCriteria f!`?_
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(detachedCriteria, PaginationSupport.PAGESIZE, G(TFv\`vH
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startIndex); #Pp:H/b
} Rd5_{F
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public PaginationSupport findPageByCriteria ?VmgM"'md
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(final DetachedCriteria detachedCriteria, finalint 9K/EteS
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pageSize, |w}j!}u
finalint startIndex){ dN)8r
return(PaginationSupport) T7.Iqw3p
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getHibernateTemplate().execute(new HibernateCallback(){ XhHgXVVGG<
publicObject doInHibernate BZ1wE1 t
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(Session session)throws HibernateException { nOvR, 6
Criteria criteria = _ERtL5^
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detachedCriteria.getExecutableCriteria(session); M|mfkIk0MB
int totalCount = ]}XDDPbZ}
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((Integer) criteria.setProjection(Projections.rowCount >kK@tJn
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()).uniqueResult()).intValue(); H3<tsK=:
criteria.setProjection 8 O9^g4?
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(null); R~kO5jpW
List items = ?$ e]K/*
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criteria.setFirstResult(startIndex).setMaxResults p eO@ZKmM
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(pageSize).list(); 95z|}16UK
PaginationSupport ps = 1>j,v+
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new PaginationSupport(items, totalCount, pageSize, u,So+%
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startIndex); RI&O@?+U
return ps; P'lnS&yA
} t-iXY0%&
}, true); b;UBvwY_
} tfGs|x
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public List findAllByCriteria(final AAlc %d/9
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DetachedCriteria detachedCriteria){ rM,e$
return(List) getHibernateTemplate ,s #~00C|
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().execute(new HibernateCallback(){ $qQYxx@
publicObject doInHibernate ]O"f %
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(Session session)throws HibernateException { ly17FLJ].
Criteria criteria = k8+J7(_c
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detachedCriteria.getExecutableCriteria(session); )bOfs*S
return criteria.list(); z/1$G"
} =#Sw.N
}, true); C!*!n^qA
} MONX&$
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public int getCountByCriteria(final Y0 a[Lb0
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DetachedCriteria detachedCriteria){ Q:(mK* _
Integer count = (Integer) W/!P1M n
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getHibernateTemplate().execute(new HibernateCallback(){ 5;/n`Bd
publicObject doInHibernate CW
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(Session session)throws HibernateException { g8##Be
Criteria criteria = 51q|-d
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detachedCriteria.getExecutableCriteria(session); kWXLncE
return PR.3EL
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criteria.setProjection(Projections.rowCount v.-DXQq
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()).uniqueResult(); <u!cdYo@
} Ds">eNq
}, true); kP
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return count.intValue(); f$xXR$mjf
} mQ:{>`
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用户在web层构造查询条件detachedCriteria,和可选的 ^9[Q;=R
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 7y'uZAF
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PaginationSupport的实例ps。 <=*f
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ps.getItems()得到已分页好的结果集 4b2d(x)0X
ps.getIndexes()得到分页索引的数组 k XSX<b <%
ps.getTotalCount()得到总结果数 UY<