Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 nkN2Bqt$
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ;?-{Uk
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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 xkkG#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 ]N1,"W}
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分页支持类: ,6A/| K-
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java代码: L<Z2
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package com.javaeye.common.util; An
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import java.util.List; nXh<+7
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publicclass PaginationSupport { \x_$Pu
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publicfinalstaticint PAGESIZE = 30; zHW&i~
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privateint pageSize = PAGESIZE; C+C1(b;1
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privateList items; {#+'T 13sx
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privateint totalCount; 2T"[$iH!7
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privateint[] indexes = newint[0]; +J !1z
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privateint startIndex = 0; oTpoh]|[
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public PaginationSupport(List items, int k{\a_e`
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totalCount){ h{PJ4U{W
setPageSize(PAGESIZE); u3PM 7z!~
setTotalCount(totalCount); Tz/[P:O3
setItems(items); <yKyM#4X
setStartIndex(0); EmV ZqW
} ("J_< p
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public PaginationSupport(List items, int SsIN@
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totalCount, int startIndex){ VmTgD96
setPageSize(PAGESIZE); >DR/lBtL
setTotalCount(totalCount); @])}+4D(S
setItems(items); 0MOn>76$N
setStartIndex(startIndex); i]zTY\gw8M
} leJ3-w{ 2
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public PaginationSupport(List items, int ">R`S<W
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totalCount, int pageSize, int startIndex){ 1h?:gOig
setPageSize(pageSize); JjQTD-^
setTotalCount(totalCount); 6IL-S%EGK1
setItems(items); |Lz7}g=6
setStartIndex(startIndex); MAG/7T5
} I,?!NzB
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publicList getItems(){ 5{M$m&$1
return items; +L}R|ihkI
} ^|%7}=e
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publicvoid setItems(List items){ .J9\Fr@
this.items = items; ev(E
} Qkg([q4
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publicint getPageSize(){ 7Y*Q)DDy
return pageSize; ]\J(
} yI$MqR
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publicvoid setPageSize(int pageSize){ {=kW?
this.pageSize = pageSize; 4ak} "Z
} {Gr"oO`&"
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publicint getTotalCount(){ OMN|ea.O
return totalCount; (:J
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} &ETPYf%#
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publicvoid setTotalCount(int totalCount){ \!'K#%]9
if(totalCount > 0){ ZY> u4v.
this.totalCount = totalCount; e\i}@]
int count = totalCount / 'lR f
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pageSize; yg@}j
if(totalCount % pageSize > 0) M%FKg/
count++; 3x~AaC.j
indexes = newint[count]; AV["%$:
for(int i = 0; i < count; i++){ kX]p;C
indexes = pageSize * 3O'X;s2\d
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} I KDh)Zm
}else{ G X>T~i\f8
this.totalCount = 0; aOo;~u2-=
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publicint[] getIndexes(){ ~m@w p
return indexes; d9uT*5f
} 6dX l ny1H
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publicvoid setIndexes(int[] indexes){ 4xNzhnp|
this.indexes = indexes; &>o?0A6
} nXF|AeAco
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publicint getStartIndex(){ }x}JzA+2
return startIndex; }X*.Vv A
} ]gGCy '*)
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publicvoid setStartIndex(int startIndex){ LC:bHM,e
if(totalCount <= 0) 4 jeUYkJUM
this.startIndex = 0; B3|r O
elseif(startIndex >= totalCount) )Y+?)=~
this.startIndex = indexes *]_GFixi
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[indexes.length - 1]; Z<0+<tt
elseif(startIndex < 0) ZIrJ"*QO=
this.startIndex = 0; 0Ku%9wh-
else{ ';bovh@*
this.startIndex = indexes ~.w Db,*
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[startIndex / pageSize]; sZhl.[&zo
} Qvd$fY**
} nu#_,x<LS
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publicint getNextIndex(){ !zNMU$p
int nextIndex = getStartIndex() + 1$Pn;jg:
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pageSize; cAE.I$T(
if(nextIndex >= totalCount) e
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return getStartIndex(); O$=)
else ?=uw0~O[
return nextIndex; txwTJScg
} 6A& f
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publicint getPreviousIndex(){ n'#(iW)f
int previousIndex = getStartIndex() - L.xzI-I@D
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pageSize; F W # S.<
if(previousIndex < 0) Pl
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return0; THmX=K4=?
else sQS2U6
return previousIndex; f9FsZD
} ?)cNe:KY
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} I/s?]v
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抽象业务类 <L__;j1Wx
java代码: "l&sDh%Lk<
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/** QH%{r4
* Created on 2005-7-12 By@<N [I@
*/ OX?9 3AlG
package com.javaeye.common.business; ]*^mT&$7
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import java.io.Serializable; U"xI1fg%b
import java.util.List; 'Z7oPq6
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import org.hibernate.Criteria; nYuZg6K
import org.hibernate.HibernateException; 0rT-8iJp4P
import org.hibernate.Session; w<awCp
import org.hibernate.criterion.DetachedCriteria; A;h0BQm/j
import org.hibernate.criterion.Projections; '8>#`Yba
import 'MM#nQ\(
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org.springframework.orm.hibernate3.HibernateCallback; S[NV-)r=
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org.springframework.orm.hibernate3.support.HibernateDaoS =? x A*_^
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upport; nrA}36 E
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import com.javaeye.common.util.PaginationSupport; A{;b^IK
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public abstract class AbstractManager extends 8@/]ki`>
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HibernateDaoSupport { x-U^U.i@
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privateboolean cacheQueries = false; ag?@5q3J}
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privateString queryCacheRegion; }x-~>$:"
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publicvoid setCacheQueries(boolean C|W_j&S65
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cacheQueries){ GA6Z{U{XS
this.cacheQueries = cacheQueries; mw`%xID*
} ,q/K&'0`
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publicvoid setQueryCacheRegion(String A@_F ;4X
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queryCacheRegion){ t22BO@gt74
this.queryCacheRegion = ^=D77 jS
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queryCacheRegion; QD<^VY6
} ;myu8B7&
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publicvoid save(finalObject entity){ ?GD{}f33
getHibernateTemplate().save(entity); 5]p>&|Ud
} m3 (fr
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publicvoid persist(finalObject entity){ J`} /+WN 7
getHibernateTemplate().save(entity); v2EM| Q xp
} (LRv c!`"
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publicvoid update(finalObject entity){ ;b
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getHibernateTemplate().update(entity); U`<EpO{j|
} u/y`M]17
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publicvoid delete(finalObject entity){ x}N+vK
getHibernateTemplate().delete(entity); -1S+fUkiK/
} IDE@{Dy
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publicObject load(finalClass entity, >S5D-)VX
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finalSerializable id){ n?Gm 5##
return getHibernateTemplate().load fBD5K3
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(entity, id); Zf]d'oW{/
} *[W! ng
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publicObject get(finalClass entity, ;N ]ElwP
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finalSerializable id){ $CL=M
return getHibernateTemplate().get :r^i0g|5P
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(entity, id); 7F\U|kx_
} X_Y$-I$qd
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publicList findAll(finalClass entity){ b4ORDU
return getHibernateTemplate().find("from 39"8Nq|e
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" + entity.getName()); W1r- uR
} HEjV7g0E
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publicList findByNamedQuery(finalString <&l3bL
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namedQuery){ 2lAuO!%
return getHibernateTemplate *tz"T-6O
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().findByNamedQuery(namedQuery); *1; <xeVD
} &giJO-^
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publicList findByNamedQuery(finalString query, K Qub%`n
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finalObject parameter){ M9bb,`X>Q
return getHibernateTemplate qx0J}6+NlU
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().findByNamedQuery(query, parameter); 7zR7v
} Uy_`=JZ
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publicList findByNamedQuery(finalString query, hbE;zY%hP
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finalObject[] parameters){ aWe
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return getHibernateTemplate [.Kia
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().findByNamedQuery(query, parameters); #Y`U8n2F
} 20% xD e
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publicList find(finalString query){ VWLou
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return getHibernateTemplate().find \zj8| +
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(query); V)N9V|O'
} )
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publicList find(finalString query, finalObject oxcAKo
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parameter){ ? 76jz>;b
return getHibernateTemplate().find =H!u4
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(query, parameter); KS(s<ip|
} *QAK9mc
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public PaginationSupport findPageByCriteria dLQ!hKD~
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(final DetachedCriteria detachedCriteria){ l)XzU&Sc~
return findPageByCriteria 42#
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 8#7z5:_
} ]<z>YyBA
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public PaginationSupport findPageByCriteria 7*@qd&
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(final DetachedCriteria detachedCriteria, finalint ,VJ0J!@
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startIndex){ Q !S"=2
return findPageByCriteria j>?c]h{-
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(detachedCriteria, PaginationSupport.PAGESIZE, oqUtW3y
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startIndex); a7OD%yQ
} c5]^jUB6
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public PaginationSupport findPageByCriteria Jqjb@'i
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(final DetachedCriteria detachedCriteria, finalint _~5{l_v|I
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pageSize, kQ{pFFO
finalint startIndex){ cq@8!Eu w]
return(PaginationSupport) i(L;1 `
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getHibernateTemplate().execute(new HibernateCallback(){ Ngh9+b6[
publicObject doInHibernate HtmJIH:
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(Session session)throws HibernateException { ddlLS
Criteria criteria = (j}"1
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detachedCriteria.getExecutableCriteria(session); EV2whs2g
int totalCount = EiIbp4*e
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((Integer) criteria.setProjection(Projections.rowCount ;se-IDN
. (Q;EF`_U
()).uniqueResult()).intValue(); ihf5`mk/$
criteria.setProjection m{gt(n
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(null);
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List items = GwW!Q|tVz=
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criteria.setFirstResult(startIndex).setMaxResults ?&"cI5-
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(pageSize).list(); WR gAc%
PaginationSupport ps = Bb8lklQ
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new PaginationSupport(items, totalCount, pageSize, >Y)jt*vQ
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startIndex); '1^\^)&q
return ps; w*$nG$
} VU}UK$JN
}, true); h^?[:XBeav
} tlI3jrgw
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public List findAllByCriteria(final 'hf-)\Ylf
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DetachedCriteria detachedCriteria){ %+Mi~k*A'
return(List) getHibernateTemplate 2EycFjO
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().execute(new HibernateCallback(){ l J;wl|9
publicObject doInHibernate "4&HxD8_ih
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(Session session)throws HibernateException { -Ufd+(
Criteria criteria = tJ bOn$]2"
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detachedCriteria.getExecutableCriteria(session); l4|bpR Cp
return criteria.list(); HiILJyb
} #@3RYx
}, true); fPZBm&`C
} o5i?|HJ
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public int getCountByCriteria(final x44)o:
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DetachedCriteria detachedCriteria){ \*v}IO>2})
Integer count = (Integer) g@`14U/|
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getHibernateTemplate().execute(new HibernateCallback(){ c{V0]A9VF
publicObject doInHibernate 2JUX29rER
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(Session session)throws HibernateException { bhnm<RZ
Criteria criteria = )p(5$AR7
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detachedCriteria.getExecutableCriteria(session); ubj
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return zf5s\w.4
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criteria.setProjection(Projections.rowCount &gIu<*u<
q !EJs:AS
()).uniqueResult(); S%kE<M?
} B#B$w_z
}, true); 0$":W
return count.intValue(); s~IOc%3
} E)09M%fe
} STVJu![
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用户在web层构造查询条件detachedCriteria,和可选的 818</b<yn
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 n-}:D<\7
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PaginationSupport的实例ps。 VahR nD
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ps.getItems()得到已分页好的结果集 (X)$8y
ps.getIndexes()得到分页索引的数组 nAoGG0$5
ps.getTotalCount()得到总结果数 {QM;%f
ps.getStartIndex()当前分页索引 jMzHs*:
ps.getNextIndex()下一页索引 H{\tQ->(2
ps.getPreviousIndex()上一页索引 F$ZWQ9&5U0
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 h:z;b;
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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 Ua5m2&U