Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 h![#;>(
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 zX~MC?,W1
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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 Q&&@v4L
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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 )+M0Y_r
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分页支持类: *A< 5*Db:F
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java代码: }Lv;!
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package com.javaeye.common.util; :4s1CC+@\
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import java.util.List; 1}37Q&2
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publicclass PaginationSupport {
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publicfinalstaticint PAGESIZE = 30; 9kojLqCT
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privateint pageSize = PAGESIZE; 3F0 N^)@
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privateList items; kLY^!
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privateint totalCount; -+5>|N#
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privateint[] indexes = newint[0]; FqifriLN
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privateint startIndex = 0; KgG4*<
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public PaginationSupport(List items, int ':}\4j&{E
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totalCount){ ExM,g' 7
setPageSize(PAGESIZE); !+ njS
setTotalCount(totalCount); DJ%PWlK5
setItems(items); |' .
setStartIndex(0); uocGbi:V';
} kl,3IKHa
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public PaginationSupport(List items, int L(o15
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totalCount, int startIndex){ V,9cl,z+
setPageSize(PAGESIZE); 3[&C g
setTotalCount(totalCount); .G^YqJ 4
setItems(items); h1{3njdr
setStartIndex(startIndex); ~v83pu1!2s
} kR9-8I{J
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public PaginationSupport(List items, int >{Tm##@,k
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totalCount, int pageSize, int startIndex){ Z=
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setPageSize(pageSize); a:S -
setTotalCount(totalCount); X(C$@N
setItems(items); PzGWff!*n
setStartIndex(startIndex); d\Zng!Z '
} vI]N^j2%
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publicList getItems(){ 5PW^j\G-f
return items; 2-b6gc7
} =mGez )T5\
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publicvoid setItems(List items){ <,(,jU)j
this.items = items; KYP!Rs/j.
} d %#b:(,
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publicint getPageSize(){ p:%loDk
return pageSize; .~}1+\~5
} 'RRE|L,
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publicvoid setPageSize(int pageSize){ yEoV[K8k
this.pageSize = pageSize; JCaOK2XT;
} W%)Y#C
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publicint getTotalCount(){ cAc@n6[`3
return totalCount; g ci
} 5Ph4<f` L~
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publicvoid setTotalCount(int totalCount){ &=Wlaa/,&
if(totalCount > 0){ KdlQ!5(?X
this.totalCount = totalCount; LDD|(KLR*.
int count = totalCount / UDni]P!E
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pageSize; y Wya&|D9
if(totalCount % pageSize > 0) gO^gxJ'0t
count++; E!#WnSpnK
indexes = newint[count]; _y>~
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for(int i = 0; i < count; i++){ /=, nGk>
indexes = pageSize * "vslZ`RU
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} j+(I"h3
}else{ _~
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this.totalCount = 0; <9%R\_@$H
} g[t [/TV
} * H9 8Du
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publicint[] getIndexes(){ m_l[MG\
return indexes; A4ygW:
} P2*<GjV`S/
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publicvoid setIndexes(int[] indexes){ ##o#eZq:"
this.indexes = indexes; ow#1="G,=
} 42{:G8
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publicint getStartIndex(){ 7!$^r$t
return startIndex; -tNUMi'
} !YJs]_Wr
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publicvoid setStartIndex(int startIndex){ |&[EZ+[
if(totalCount <= 0) 6 _ow%Rx~F
this.startIndex = 0; =>dGL|
elseif(startIndex >= totalCount) <rmvcim{*
this.startIndex = indexes lA-h`rl/
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[indexes.length - 1]; xjUtl
elseif(startIndex < 0) N&V`K0FU
this.startIndex = 0; g>9kXP+
else{ d'I"jZ
this.startIndex = indexes w'3iY,_ufC
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[startIndex / pageSize]; {u9}bx'<
} D1mfm.9_r^
} p[lA\@l[
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publicint getNextIndex(){ gGS=cdlV
int nextIndex = getStartIndex() + Rx|;=-8zg
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pageSize; {91nL'-'
if(nextIndex >= totalCount) kE(mVyLQ
return getStartIndex(); 0<B$#8
else tdaL/rRe
return nextIndex; y#$CMf
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} /^|Dbx!u
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publicint getPreviousIndex(){ s|B3~Q]
int previousIndex = getStartIndex() - &l[$*<P5V
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pageSize; -FCe:iY! A
if(previousIndex < 0) !&Pui{F
return0; D#/Bx[
else [ps*uva
return previousIndex; jMDY(mwt
} <1COZ)
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} HOh!Xcu
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抽象业务类 )@'}\_a3[]
java代码: ]}(H0?OQR
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/** U!Z,xx[]
* Created on 2005-7-12 A$xF$l
*/ (/*]?Ehd
package com.javaeye.common.business; % -e 82J1
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import java.io.Serializable; AjgF6[B
import java.util.List; [=^3n#WW
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import org.hibernate.Criteria; mju>>\9
import org.hibernate.HibernateException; LRMx<X8
import org.hibernate.Session; :TC@tM~Oy
import org.hibernate.criterion.DetachedCriteria; NL0n009"c$
import org.hibernate.criterion.Projections; QS]1daMIK<
import nL.<[]r
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org.springframework.orm.hibernate3.HibernateCallback; 9v!1V,`j"
import =6|&Jt
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org.springframework.orm.hibernate3.support.HibernateDaoS ;
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upport; ?_"ik[w}
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import com.javaeye.common.util.PaginationSupport; E'.7xDN
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public abstract class AbstractManager extends k/gZ,
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HibernateDaoSupport {
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privateboolean cacheQueries = false; Y.ToIka{
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privateString queryCacheRegion; yw3$2EW
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publicvoid setCacheQueries(boolean 9
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cacheQueries){ f_Av3
this.cacheQueries = cacheQueries; X=8{$:
} M b1sF
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publicvoid setQueryCacheRegion(String ;Nj7qt
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queryCacheRegion){ @Sbe^x
this.queryCacheRegion = *lw_=MXSK
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queryCacheRegion; ,47Y9Kz9
} PJrtMAcKq
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publicvoid save(finalObject entity){ JOLaP@IPT
getHibernateTemplate().save(entity); cFnDmtI:
} l.bYE/F0&
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publicvoid persist(finalObject entity){ fG(SNNl+D
getHibernateTemplate().save(entity); TNh1hhJ$b
} P{+T<bk|
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publicvoid update(finalObject entity){ \:ak ''
getHibernateTemplate().update(entity); :#?5X|Gz
} f|lU6EkU
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publicvoid delete(finalObject entity){ q Xe8Kto
getHibernateTemplate().delete(entity); I\JGs@I
} s '\Uap
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publicObject load(finalClass entity, 25[I=ZdS
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finalSerializable id){ C"T;Qp~B
return getHibernateTemplate().load Nyj( 0W
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(entity, id); !XCm>]R
} xZwLlY
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publicObject get(finalClass entity, %pd ,%pg
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finalSerializable id){ thM4vq
return getHibernateTemplate().get D"?fn<2
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(entity, id); os={PQRD
} g($DdKc|g
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publicList findAll(finalClass entity){ W_8wed:b
return getHibernateTemplate().find("from \EtQ5T*u
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" + entity.getName()); c%G{#}^2
} /M4{Wc
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publicList findByNamedQuery(finalString gPsi
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namedQuery){ YccH+[X;
return getHibernateTemplate 2Kyl/C,
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().findByNamedQuery(namedQuery); s`'{I8'p/
}
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publicList findByNamedQuery(finalString query, sN2p76KN
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finalObject parameter){ g8xQ|px
return getHibernateTemplate =U|.^5sa#
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().findByNamedQuery(query, parameter); Y
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} z hRB,1iG
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publicList findByNamedQuery(finalString query, Slher0.Y
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finalObject[] parameters){ HbAkZP
return getHibernateTemplate A
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().findByNamedQuery(query, parameters); FrYqaP
} p@5`&Em,
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publicList find(finalString query){ =&2Lb
return getHibernateTemplate().find ^,_w$H
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(query); r)~ T@'y
} Vq\`+&A
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publicList find(finalString query, finalObject s<_)$}
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parameter){ F,MO@&ue"
return getHibernateTemplate().find f[a}aZ9)
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(query, parameter); ps%q9}J
} `t9?=h!
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public PaginationSupport findPageByCriteria @&:ar
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(final DetachedCriteria detachedCriteria){ 0#&5.Gr)
return findPageByCriteria
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); -~ Mb
} 5Z\#0":e
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public PaginationSupport findPageByCriteria .#Z%1U%P.
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(final DetachedCriteria detachedCriteria, finalint +W\f(/ q0
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startIndex){ sq[iY
return findPageByCriteria x`mN U
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(detachedCriteria, PaginationSupport.PAGESIZE, DRgTe&+
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startIndex); Nkl_Ho,
} @$c\dvO
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public PaginationSupport findPageByCriteria <$~mE9a6
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(final DetachedCriteria detachedCriteria, finalint hn=[1<#^(
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pageSize, Vq;A>
finalint startIndex){ ?yR&/a
return(PaginationSupport) ,7NZu0
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getHibernateTemplate().execute(new HibernateCallback(){ ? 1$fJ3
publicObject doInHibernate M9@ri ^x
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(Session session)throws HibernateException { Mt5PaTjj
Criteria criteria = *"n vX2iz
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detachedCriteria.getExecutableCriteria(session); C
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int totalCount = dJ""XaHqf
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((Integer) criteria.setProjection(Projections.rowCount &2zq%((r
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()).uniqueResult()).intValue(); Qj6/[mUr~
criteria.setProjection p2udm! )J
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(null); <5jzl
List items = y2vUthRwo
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criteria.setFirstResult(startIndex).setMaxResults i35=Y~P-
^? ]%sdT q
(pageSize).list(); fasgmi}
PaginationSupport ps = Qx47l
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new PaginationSupport(items, totalCount, pageSize, 3?Pn6J{O
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startIndex); 1u(.T0j7f
return ps; ixQJ[fH10
} XWs"jt
}, true); :2-pjkhiwY
} GJp85B!PlO
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public List findAllByCriteria(final P(73!DT+
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DetachedCriteria detachedCriteria){ hcbv;[bG
return(List) getHibernateTemplate V6#K2
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().execute(new HibernateCallback(){ jR#~I@q^
publicObject doInHibernate _({A\}Q|
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(Session session)throws HibernateException { G0;XaL:
Criteria criteria = Z(_ZAB%+D
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detachedCriteria.getExecutableCriteria(session); [[Y0
return criteria.list(); JPWOPB'H
} 0,rTdjH7
}, true); 'X!?vK^]p
} Bv.`R0e&
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public int getCountByCriteria(final Ttc[Q]Ri
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DetachedCriteria detachedCriteria){ Yx inE`u~
Integer count = (Integer) F]t(%{#W
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getHibernateTemplate().execute(new HibernateCallback(){ {TRsd
publicObject doInHibernate z)=+ F]
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(Session session)throws HibernateException { ,qrQ"r9
Criteria criteria = GSQ/NYK
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detachedCriteria.getExecutableCriteria(session); 3^~KB'RZ
return V{&rQ@{W
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criteria.setProjection(Projections.rowCount m7GR[MR
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()).uniqueResult(); U*P. :BvG
} xvSuPP4 m
}, true); &gE 75B
return count.intValue(); (?! ,p^
} "a/ Q%.P
} u@%r
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用户在web层构造查询条件detachedCriteria,和可选的 -tI'3oT1
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 d/e|'MPX
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PaginationSupport的实例ps。 d{de6 `
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ps.getItems()得到已分页好的结果集 w7n373y%
ps.getIndexes()得到分页索引的数组 uH;-z_Wpn!
ps.getTotalCount()得到总结果数 D'hW|
ps.getStartIndex()当前分页索引 N#_GJSG_|
ps.getNextIndex()下一页索引 V)i5=bHC
ps.getPreviousIndex()上一页索引 vuFBET,
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 q;wLa#4)J
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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 *I0-O*Xr
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一下代码重构了。 oejfU;+$
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我把原本我的做法也提供出来供大家讨论吧: 5 VA(tzmCt
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首先,为了实现分页查询,我封装了一个Page类: !HJ$UG/\
java代码: )I-f U4?
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/*Created on 2005-4-14*/ gxGrspqg
package org.flyware.util.page; 6 Ik,zQL
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/** N9rBW
* @author Joa O!Z|r?
* 56Z\-=KAU
*/ 5Fm=/o1
publicclass Page { |uH%6&\
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/** imply if the page has previous page */ Q9`QL3LQD
privateboolean hasPrePage; a%Jx
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/** imply if the page has next page */ LN_OD5gZ
privateboolean hasNextPage; tB'V
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/** the number of every page */ y9|K|xO[
privateint everyPage; <d7V<&@o=
7.+#zyF
/** the total page number */ 9=/N|m8.
privateint totalPage; [;b=A
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/** the number of current page */ /+3a n9h
privateint currentPage; N6[i{;K@N{
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/** the begin index of the records by the current ,s^<X85gp\
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query */ :;!\vfZbU
privateint beginIndex; ^ 2u/n
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/** The default constructor */ >uI$^y1D
public Page(){ 2n`Lg4=
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} d=]U_+
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/** construct the page by everyPage bxXiQa
* @param everyPage U~2`P
* */ oT|m1aGE
public Page(int everyPage){ ,`8Y8
this.everyPage = everyPage; *V;3~x!
} gK3Mms]}m
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/** The whole constructor */ RX2{g^V7
public Page(boolean hasPrePage, boolean hasNextPage, pD@zmCU
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int everyPage, int totalPage, Cv=GZGn-
int currentPage, int beginIndex){ b]]N{: I
this.hasPrePage = hasPrePage; t^tCA -
this.hasNextPage = hasNextPage; |@o6NZ<9N
this.everyPage = everyPage;
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this.totalPage = totalPage; `$z)$VuP
this.currentPage = currentPage; zSjgx_#U
this.beginIndex = beginIndex; - &[z\"T
} K.SeK3(
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/** '?Iif#Z1
* @return <V_7|)'/A
* Returns the beginIndex. >AI<60/<
*/ *N/hc
publicint getBeginIndex(){ ad`_>lA4Lp
return beginIndex; Z# Lx_*p]Q
} 8Xm@r#Oy5
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/**
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* @param beginIndex R.1Xst &i
* The beginIndex to set. M}.b"
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*/ =J|sbY"]
publicvoid setBeginIndex(int beginIndex){ <5Mrp"C[i
this.beginIndex = beginIndex; p`+VrcCBOd
} /4joC9\AB
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/** PtKTm\,JL0
* @return o+g4p:Mf
* Returns the currentPage. wy4q[$.4v
*/ zb2K;%Qs+f
publicint getCurrentPage(){ '0+$ m=
return currentPage; \-.
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} J^I7BsZ
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/** \}inT_{g
* @param currentPage Y~"9L|`f/
* The currentPage to set. wTpD1"_R
*/ r7)@M%A
publicvoid setCurrentPage(int currentPage){ nJVp.*S
this.currentPage = currentPage; {(vOt '
} ,{j4
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/** TV{)n'aA
* @return t^@T`2jL
* Returns the everyPage. jFj~]]j
*/ vg5NY =O
publicint getEveryPage(){ B2hfD-h,>
return everyPage; P&t;WPZ
} H(\V+@~>AD
i@$-0%,
/** *e<_; Kr?
* @param everyPage _F8T\f|
* The everyPage to set. LC'2q*:'
*/ Gm&2R4 )EP
publicvoid setEveryPage(int everyPage){ U4_"aT>My
this.everyPage = everyPage; gGKKs&n7
} : z~!p~
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/** 3%M.U)|+
* @return NdQ%:OKC
* Returns the hasNextPage. v>WB FvyD
*/ YIDg'a+z
publicboolean getHasNextPage(){ cjg=nTsBA
return hasNextPage; dp^N_9$cdO
} ULvVD6RQ47
&] 3:D
/** yzc pG6,
* @param hasNextPage 1 !s28C5u
* The hasNextPage to set. &`PbO
*/ j+1KNH
publicvoid setHasNextPage(boolean hasNextPage){ YkbO&~.
this.hasNextPage = hasNextPage; L<@&nx
} q 22/_nSC
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/** P{lh)m>
* @return j<$R4A1
* Returns the hasPrePage. f8!l7{2%q
*/ %UmbDGDWI
publicboolean getHasPrePage(){ lCE2SKj
return hasPrePage; h>tsis'N9
} [s %\.y(q
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/** 6{^*JC5nj
* @param hasPrePage 4qBY%1
* The hasPrePage to set. v@,XinB[
*/ :bw6 k
publicvoid setHasPrePage(boolean hasPrePage){ 3"B+xbe=
this.hasPrePage = hasPrePage; '
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} Y~GUR&ww0n
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/**
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* @return Returns the totalPage. 4[H,3}p9H
* -wIM0YJ
*/ R`7n^,
publicint getTotalPage(){ !47A$sQ
return totalPage; 'WzUu MCx
} Q=XA"R
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/** U$EM.ot
* @param totalPage <tQXK;
* The totalPage to set. 83xd@-czgh
*/ TA9dkYlE/
publicvoid setTotalPage(int totalPage){ YUS?]~XC7x
this.totalPage = totalPage; 165WO}(;/
} 2HVCXegq
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} Wbs^(iUU}
9!S^^;PN&
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 I tgH>L'
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个PageUtil,负责对Page对象进行构造: ;y,NC2Xj
java代码: Qasr:p+
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/*Created on 2005-4-14*/ Qq>ElQ@
package org.flyware.util.page; aKD;1|)
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import org.apache.commons.logging.Log; Lo5Jb6nm
import org.apache.commons.logging.LogFactory; SZI7M"gf/+
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/** eAU"fu6d
* @author Joa ev*c4^z:s
* g)nXo:)&