Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 v@QfxV2
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ;VS$xnZ
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 sw+vyBV)r
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 f"R'Q|7D
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分页支持类: +;bP.[Z
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java代码: {ep.So6
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package com.javaeye.common.util; }~Ir&
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import java.util.List; S!h=HE
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publicclass PaginationSupport { ZKt`>KZ
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publicfinalstaticint PAGESIZE = 30; e#!p6+#"
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privateint pageSize = PAGESIZE; Xx1e SX
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privateList items; 7gE/g`"#
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privateint totalCount; 9QHV%%
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privateint[] indexes = newint[0]; 5#~E[dr
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privateint startIndex = 0; w+gPU1|(r
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public PaginationSupport(List items, int FD/=uIXH2
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totalCount){ I lZ$Jd
setPageSize(PAGESIZE); YI?tmqzt
setTotalCount(totalCount); 88Vl1d&b
setItems(items); 7 )*q@
setStartIndex(0); #|K5ma
} |O{kv}YZ
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public PaginationSupport(List items, int '?1g_C QsS
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totalCount, int startIndex){ /_r` A
setPageSize(PAGESIZE); AI]lG]q8
setTotalCount(totalCount); B/I1<%Yk
setItems(items); v.F|8 cG
setStartIndex(startIndex); kL"Y>@H
} %R P\,|
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public PaginationSupport(List items, int ^00C"58A
{_ {zs!r
totalCount, int pageSize, int startIndex){ vngn^2
setPageSize(pageSize); Y%^qt]u.8
setTotalCount(totalCount); \m#{{SGm
setItems(items); 28>/#I9/]
setStartIndex(startIndex); IQQ>0^Q~
} ]v#T9QQN
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publicList getItems(){ 6*:U1{Gl)
return items; Pr3>}4M
} OlM3G^1e1
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publicvoid setItems(List items){ yM*_"z!L
this.items = items; Rbcu5.6
} H@'u$qr$:
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publicint getPageSize(){ 84/#,X!=s
return pageSize; f1|&umJ$
} =g$%jM>35
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publicvoid setPageSize(int pageSize){ ^bECX<,H
this.pageSize = pageSize; iN1_T
} _Uhl4Mh
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publicint getTotalCount(){ L,sFwOWY
return totalCount; +iw4>0pi
} o\X|\nUk
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publicvoid setTotalCount(int totalCount){ p. KT=dZT
if(totalCount > 0){ g/gaPc*86
this.totalCount = totalCount; lT_dzO
int count = totalCount / .9q`Tf
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pageSize; +|qw>1J(
if(totalCount % pageSize > 0) PV-B<Y
count++; =g?k`vp
indexes = newint[count]; 3*N0oc^m
for(int i = 0; i < count; i++){ 3x>Y
indexes = pageSize * f1
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} ?N&s.
}else{ 1ezBnZJg
this.totalCount = 0; T3PwM2em_`
} d?aZk-|c
} ,3W,M=j)
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publicint[] getIndexes(){ <MJ-w1A
return indexes; mpD[k9`x#
} r |2{(+
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publicvoid setIndexes(int[] indexes){ S}6xkX
this.indexes = indexes; T}Wse{
} 9JO1O:W
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publicint getStartIndex(){ 3g5D[>J'
return startIndex; A}i>ys
} sLf~o"yb
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publicvoid setStartIndex(int startIndex){ Z9j`<VgN
if(totalCount <= 0) G4uA&"OE
this.startIndex = 0; dte-2?%~j
elseif(startIndex >= totalCount) f |NXibmP
this.startIndex = indexes V5p->X2#
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[indexes.length - 1]; YcW)D
elseif(startIndex < 0) Z61L;E
this.startIndex = 0; XV1XzG# C
else{ `Dp4Z>|
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this.startIndex = indexes t? Q
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[startIndex / pageSize]; = VMELk!z
} zN/nKj: Q
} AsR}qqG
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publicint getNextIndex(){ x[mh^V5ld
int nextIndex = getStartIndex() + -m$2"_
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pageSize; m`n#Q#6
if(nextIndex >= totalCount) oWq]\yT<`
return getStartIndex(); UTqKL*p523
else 1z_1Hl
return nextIndex; e^UUR-K%
} 9r
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publicint getPreviousIndex(){ AI-ZZ6lzR
int previousIndex = getStartIndex() - fJ+4H4K
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pageSize;
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if(previousIndex < 0) ol}}c6
return0; zIr4!|X
else G6s3\de#U
return previousIndex; |Rz}bsrZ
} #I#_gjJkx
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} %DKC/%
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抽象业务类 0O(V y y
java代码: (O/W`qo
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/** |}@teN^J*U
* Created on 2005-7-12 bVr`a*EM
*/ lU.aDmy<
package com.javaeye.common.business; |(uo@-U
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import java.io.Serializable; n!U1cB{
import java.util.List; 6n
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import org.hibernate.Criteria; Nhtc^DX
import org.hibernate.HibernateException; WLH ;{
import org.hibernate.Session; &:~9'-O
import org.hibernate.criterion.DetachedCriteria; /*Gbl
import org.hibernate.criterion.Projections; z6fY_LL
import yF-`f
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org.springframework.orm.hibernate3.HibernateCallback; KON^
import Rb0{W]opt+
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org.springframework.orm.hibernate3.support.HibernateDaoS <kazV<"
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upport; 10_>EY`
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import com.javaeye.common.util.PaginationSupport; Ct$\!|aR
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public abstract class AbstractManager extends Nj +^;Y
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HibernateDaoSupport { A(z
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privateboolean cacheQueries = false; ktM7L{Nz
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privateString queryCacheRegion; ]2_=(N\Kt
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publicvoid setCacheQueries(boolean z }Vg4\x&
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cacheQueries){ c=re(
this.cacheQueries = cacheQueries; 3pyE'9"f6
} 4W=fQx]
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publicvoid setQueryCacheRegion(String O2/_$i[F
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queryCacheRegion){ <slrzc_>&
this.queryCacheRegion = '@1C$0tx
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queryCacheRegion; N w/it*f
} -}RGz_LO/
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publicvoid save(finalObject entity){ 8&CQx*
getHibernateTemplate().save(entity); xEufbFAN?
} b`;Cm)@X!)
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publicvoid persist(finalObject entity){ O"wo&5b_
getHibernateTemplate().save(entity); HIda%D
} ?>My&yB
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publicvoid update(finalObject entity){ {D8yqO A}
getHibernateTemplate().update(entity); "YVr/u
} <&tdyAT?&
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publicvoid delete(finalObject entity){ whFJ]
getHibernateTemplate().delete(entity); /)sP<WPQ6
} F6_en z
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publicObject load(finalClass entity, %8>0;ktU
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finalSerializable id){ s0DT1s&
return getHibernateTemplate().load 'f8'|o)
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(entity, id); $y%IM`/w
} GE=PaYz
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publicObject get(finalClass entity, RL*b47,
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finalSerializable id){ Kd*=-
return getHibernateTemplate().get nuw7pEW@?
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(entity, id); Ql"~ z^L
} T/:6Z
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publicList findAll(finalClass entity){ T=CJUla
return getHibernateTemplate().find("from %eGI]!vf
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" + entity.getName()); |O;vWn'U2
} ~.z82m
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publicList findByNamedQuery(finalString fr}.#~{5Y
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namedQuery){ 2s}G6'xE]P
return getHibernateTemplate MjbgAH-
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().findByNamedQuery(namedQuery); w%(D4ldp
} k7]4TIUD*
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publicList findByNamedQuery(finalString query, Yy,XKIqU
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finalObject parameter){ "*:?m{w5
return getHibernateTemplate .vd*~U"
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().findByNamedQuery(query, parameter); 5Ha(i [d
} V7D<'!
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publicList findByNamedQuery(finalString query, uUe#+[bD
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finalObject[] parameters){ dJ>tM'G
return getHibernateTemplate 8!MVDp[|"
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().findByNamedQuery(query, parameters); V6B[eV$D
} 40[@d
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publicList find(finalString query){ 0v``4z2Z
return getHibernateTemplate().find P G
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(query); xpI8QV$#
} qHPinxewx
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publicList find(finalString query, finalObject =F_j})O5
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parameter){ 9t8ccr
return getHibernateTemplate().find A,c_ME+DVB
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(query, parameter); SZ:R~4 A
} zoBp02j
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public PaginationSupport findPageByCriteria g[;&_gL
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(final DetachedCriteria detachedCriteria){ Swgvj(y;!A
return findPageByCriteria V7vojm4O
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 5@n|uJA
} E!`/XB/nA
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public PaginationSupport findPageByCriteria lB7/oa1]>
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(final DetachedCriteria detachedCriteria, finalint @6-3D/=
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startIndex){ /K;A bE
return findPageByCriteria 4C3i
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(detachedCriteria, PaginationSupport.PAGESIZE, X>Z83qV5d!
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startIndex); D\E"v,Y\+O
} p*JP='p
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public PaginationSupport findPageByCriteria nO;ox*Bk+8
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(final DetachedCriteria detachedCriteria, finalint a, `B.I
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pageSize, ~8'HX*B]z
finalint startIndex){ >n1UK5QD
return(PaginationSupport) @f-rS{
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getHibernateTemplate().execute(new HibernateCallback(){ I,V'J|=j
publicObject doInHibernate m-qOyt
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(Session session)throws HibernateException { /q!_f!<q4x
Criteria criteria = <!X]$kvG
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detachedCriteria.getExecutableCriteria(session); 9~ifST\
int totalCount = , _ xJ9_
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((Integer) criteria.setProjection(Projections.rowCount luz,z(
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()).uniqueResult()).intValue(); 'NnmLM(oh
criteria.setProjection NNRKYdp,
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(null); 6X$\:>
List items = r?`7i'
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criteria.setFirstResult(startIndex).setMaxResults vY,]f^F"
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(pageSize).list(); =.9tRq
PaginationSupport ps = h5))D!
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new PaginationSupport(items, totalCount, pageSize, aIN?|Ch
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startIndex); B_%O6
return ps; u_$Spbc]/
} `y.i(~^1
}, true); XP65
} ?=?9a
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public List findAllByCriteria(final VF9-&HuC
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DetachedCriteria detachedCriteria){ &MP8.(u `
return(List) getHibernateTemplate ~I%JVX%
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().execute(new HibernateCallback(){ JI92Dc*o
publicObject doInHibernate McU]U9:z
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(Session session)throws HibernateException { 0y#TGM|0D
Criteria criteria = ;'| t>'0_
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detachedCriteria.getExecutableCriteria(session); YZp]vlm~
return criteria.list(); nZUBblRJ)
} ~Q1%DV.
}, true); q.RW_t~
} s ,GGO3^
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public int getCountByCriteria(final z^9df(
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DetachedCriteria detachedCriteria){ zMN4cBL9m
Integer count = (Integer) (8.|q6Nww
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getHibernateTemplate().execute(new HibernateCallback(){ lD)QB!*v
publicObject doInHibernate RIxGwMi%
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(Session session)throws HibernateException { XAc#ywophi
Criteria criteria = YQ<O.E
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detachedCriteria.getExecutableCriteria(session); oNr~8CA`
return _p=O*$b.
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p;
criteria.setProjection(Projections.rowCount p[-buB]
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()).uniqueResult(); Z"G@I= Q(
} AZYu/k
}, true); H?axlRmw3
return count.intValue(); 9:l>FoXS
} `ynD-_fTN
} geu8$^
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用户在web层构造查询条件detachedCriteria,和可选的 &Q"Ox{~W
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 |JW-P`tL0
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PaginationSupport的实例ps。 0SBiMTm
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ps.getItems()得到已分页好的结果集 /a$RJ6t&3
ps.getIndexes()得到分页索引的数组 wg[ D*a
ps.getTotalCount()得到总结果数 |PED8K:rU
ps.getStartIndex()当前分页索引 Ue<Y ~A
ps.getNextIndex()下一页索引 ~h{v^}
ps.getPreviousIndex()上一页索引 3N,!y
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