Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 >'m&/&h
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 dA2@PKK
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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 VqD_FS;E
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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 EHl~y=9
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分页支持类: TZn5s~t
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java代码: @^#
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package com.javaeye.common.util; { /8s`m
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import java.util.List; QiqRx
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publicclass PaginationSupport { *ni0.
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publicfinalstaticint PAGESIZE = 30; MCXt,`}[
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privateint pageSize = PAGESIZE; n~jW
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privateList items; uTl"4;&j
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privateint totalCount; KAT"!b
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privateint[] indexes = newint[0]; n"~K",~P
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privateint startIndex = 0; ?<OyJ|;V
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public PaginationSupport(List items, int ;?-{Uk
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totalCount){ ]r#NjP
setPageSize(PAGESIZE); >Fe=PRs
setTotalCount(totalCount); dJb7d`
setItems(items); k<o<!
setStartIndex(0); F"tM?V.|
} {=Py|N\\t
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public PaginationSupport(List items, int f8f|'v|
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totalCount, int startIndex){ :X 1Y
setPageSize(PAGESIZE); +\vN#xDz
setTotalCount(totalCount); Sx_j`Cgy
setItems(items); |>Pv2
setStartIndex(startIndex); Z#GR)jb+
} 0U2dNLc
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public PaginationSupport(List items, int 4LJOT_
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totalCount, int pageSize, int startIndex){ E/d\ebX|
setPageSize(pageSize); fKs3H?|
setTotalCount(totalCount); D]V&1n
setItems(items); $BOIa
setStartIndex(startIndex); Hxj8cXUF|
} ~ }G#ys\1
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publicList getItems(){ Ap}`Q(.
return items; !Ome;gS)
} S.owVMQ
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publicvoid setItems(List items){ =?hbi]
this.items = items; G?+]BIiL
} d5=yAn-+=
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publicint getPageSize(){ y$?O0S%F
return pageSize; Z
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} T%2%*oa
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publicvoid setPageSize(int pageSize){ 2-wgbC5
this.pageSize = pageSize; 0MOn>76$N
} vLcOZ^iK
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publicint getTotalCount(){ ,Q8h#0z r
return totalCount; fR lJ`\ t
} ?? Dv\yLZI
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publicvoid setTotalCount(int totalCount){ 5R#:ALwX:
if(totalCount > 0){ lp]q%P
this.totalCount = totalCount; J2$=H1-
int count = totalCount / 1++ Fs
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pageSize; <Ow+LJWQK
if(totalCount % pageSize > 0) 9!vimu)
count++; G4,BcCPQ
indexes = newint[count]; ?Q}3X-xy
for(int i = 0; i < count; i++){ DOWZhD
indexes = pageSize * x@<!# d+
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}
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}else{ ; HjT
this.totalCount = 0; \'Ca%j
} 78u=J z6
} $
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publicint[] getIndexes(){ VDPq3`$+v{
return indexes; .h;X5q1
} z%WOv~8~
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publicvoid setIndexes(int[] indexes){ 5?gZw;yiv%
this.indexes = indexes; &Zm1(k6&K
} )N]%cO(^
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publicint getStartIndex(){ kZvh<NFh_
return startIndex; #+PfrS=
} .1?7)k
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publicvoid setStartIndex(int startIndex){ rZ7)sE5L
if(totalCount <= 0) u=p-]?
this.startIndex = 0; f%TP>)jag!
elseif(startIndex >= totalCount) 7!E7XP6,~>
this.startIndex = indexes JQWW's}
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[indexes.length - 1]; t%>x}b"2T
elseif(startIndex < 0) o[CjRQY]P
this.startIndex = 0; O\qY?)
else{ vH9Gf
this.startIndex = indexes 'l3K*lck
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[startIndex / pageSize]; ^5![tTJ
} $5m_)]w4a
} s_ N]$3'[E
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publicint getNextIndex(){ a;QMAd!
int nextIndex = getStartIndex() + Y|8:;u'
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pageSize; BYs-V:
if(nextIndex >= totalCount) '|S%aMLZ)
return getStartIndex(); Mu{;vf|j
else $-#Yl&?z9
return nextIndex; p3]_}Y
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} MS0Fl|YA
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publicint getPreviousIndex(){ ][W_[0v
int previousIndex = getStartIndex() - cgl*t+o&
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pageSize; u:m]CPz
if(previousIndex < 0) jV?
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return0; ?T>'j mmV=
else ~><^'j[
return previousIndex; :4MB]v[K
} Ps%qfL\
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} {e+-vl
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抽象业务类 ccLq+a|
java代码: a@\D$#2r
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/** h$.:Uj8/
* Created on 2005-7-12 \MjJ9u `8
*/ u%]shm
package com.javaeye.common.business; y`$Q\}fS
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import java.io.Serializable; 0pJ
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import java.util.List; n>A98NQ
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import org.hibernate.Criteria; #]#sGmW/L
import org.hibernate.HibernateException; H"C[&r
import org.hibernate.Session; `.T}=j|
import org.hibernate.criterion.DetachedCriteria; 05snuNt]-
import org.hibernate.criterion.Projections; *P 3V
import oyNSh8c7c
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org.springframework.orm.hibernate3.HibernateCallback; -jn WZ5.
import ^S)cjH`P
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org.springframework.orm.hibernate3.support.HibernateDaoS Gg~QAsks
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upport; + J{0 E
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import com.javaeye.common.util.PaginationSupport; e]T`ot#/
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public abstract class AbstractManager extends Vpr/
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HibernateDaoSupport { ,(.MmP`
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privateboolean cacheQueries = false; t^[8RhD
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privateString queryCacheRegion; !q-f9E4`
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publicvoid setCacheQueries(boolean 52.>+GC
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cacheQueries){ Fbu5PWhlc
this.cacheQueries = cacheQueries; :>aQ~1f>]
} /
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publicvoid setQueryCacheRegion(String ^/5XZ} *
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queryCacheRegion){ A].>.AI
this.queryCacheRegion = >(y<0
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queryCacheRegion; _:+
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} -QyhwG=
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publicvoid save(finalObject entity){ }gkM^*$:%
getHibernateTemplate().save(entity); (_4;') 9
} Y-'78BJk
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publicvoid persist(finalObject entity){ {V1Pp;A
getHibernateTemplate().save(entity); t+?P^Ok
} d*oUfiW
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publicvoid update(finalObject entity){ X[2[!)Rk
getHibernateTemplate().update(entity); 6{,HiY
} .[u>V
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publicvoid delete(finalObject entity){ 341?0%=
getHibernateTemplate().delete(entity); XE3'`D!
} dq IlD!
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publicObject load(finalClass entity,
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finalSerializable id){ .)|a2d ~F
return getHibernateTemplate().load >K# ,cxY
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(entity, id); xyH/e*a
} GHF_R,7
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publicObject get(finalClass entity, F?m?UQS'u
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finalSerializable id){ g\GdkiIj
return getHibernateTemplate().get xsjO)))f
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(entity, id); IMnP[WA!
} s7r9,8$
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publicList findAll(finalClass entity){ Aa?I8sbc
return getHibernateTemplate().find("from DWt*jX *
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" + entity.getName()); AGYm';z3
} 7%OKH<i\2<
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publicList findByNamedQuery(finalString HNa]H;-+5
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namedQuery){ 5&CDHc7Oj
return getHibernateTemplate i.iio-
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().findByNamedQuery(namedQuery); PiLJZBUv
} U},=LsDsW4
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publicList findByNamedQuery(finalString query, &"uV~AM
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finalObject parameter){ K:yr-#(P/
return getHibernateTemplate LT+3q%W.UC
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().findByNamedQuery(query, parameter); &[?CTZ
} o%M<-l"!/
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publicList findByNamedQuery(finalString query, HTz+K6&
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finalObject[] parameters){ )_jSG5k
return getHibernateTemplate K2'O]#
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().findByNamedQuery(query, parameters); Q^eJ4{Ya:
} 6k])Kl J2;
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publicList find(finalString query){ H5wb_yBQ+
return getHibernateTemplate().find i4Z4xTn
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(query); ;~zNqdlH
} I#A2)V0P)
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publicList find(finalString query, finalObject HV]Ze>}
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parameter){ RU!?-#*
return getHibernateTemplate().find |ek
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(query, parameter); Yx?aC!5M
} %l9$a`&
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public PaginationSupport findPageByCriteria v"1Po_`
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(final DetachedCriteria detachedCriteria){ h_
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return findPageByCriteria d!{7r7ob\
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); v|+5:jFOqb
} ]rX9MA6
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public PaginationSupport findPageByCriteria .gD km^
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(final DetachedCriteria detachedCriteria, finalint -zC]^Ho@
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startIndex){ 70iH0j)
return findPageByCriteria @FX{M..
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(detachedCriteria, PaginationSupport.PAGESIZE, wJIB$3OT
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startIndex); {\We72!
} yq*JdTF
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public PaginationSupport findPageByCriteria A@ VaaX
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(final DetachedCriteria detachedCriteria, finalint jH0Bo;
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pageSize, zh?4K*>.k
finalint startIndex){ A'g,:8Ou
return(PaginationSupport) W8*
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getHibernateTemplate().execute(new HibernateCallback(){ hWxT !
publicObject doInHibernate <IH*\q:7
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(Session session)throws HibernateException { 3H'*?|Y(#
Criteria criteria = K -E`y
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detachedCriteria.getExecutableCriteria(session); FNJ!IkuR
int totalCount = +S0u=u65
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((Integer) criteria.setProjection(Projections.rowCount B(Y.`L? %E
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()).uniqueResult()).intValue(); Bm<^rhJ9
criteria.setProjection 'a_s%{BJXg
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(null); EE9vk*[@C
List items = *[
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criteria.setFirstResult(startIndex).setMaxResults SJ[AiHR
g-eq
(pageSize).list(); NxB+?
PaginationSupport ps = F,.Q|.nN
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new PaginationSupport(items, totalCount, pageSize, &q L<C
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startIndex); O(Td:Zdp
return ps; "B?R|
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} &/DOO ^
}, true); Z?C4a}
} :@;6
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public List findAllByCriteria(final !c."
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DetachedCriteria detachedCriteria){ b_ZNI0Hp@
return(List) getHibernateTemplate Ri[S<GOMii
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().execute(new HibernateCallback(){ i.F8
publicObject doInHibernate o[n<M>@
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(Session session)throws HibernateException { >mew"0Q
Criteria criteria = '#KA+?@
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detachedCriteria.getExecutableCriteria(session); Z$1.^H.Db
return criteria.list(); NQg'|Pt(%
} e7lo!(>#
}, true); @OY1`EuO
} xl|ghjn
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public int getCountByCriteria(final -ywX5B
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DetachedCriteria detachedCriteria){ #g F2(iK6
Integer count = (Integer) Imke/ =h
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getHibernateTemplate().execute(new HibernateCallback(){ h)7v1,;w'
publicObject doInHibernate }+*w.X}L
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(Session session)throws HibernateException { j/~VP2R`
Criteria criteria = ?U}sQ;c$
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detachedCriteria.getExecutableCriteria(session); -e &$,R>;
return $^]
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criteria.setProjection(Projections.rowCount \moZ6J
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()).uniqueResult(); F1 9;RaP+
} 9qnuR'BDu
}, true); Dp%5$wF)8
return count.intValue(); +[>yO _}
} 2;dM:FHLhO
} Xs{/}wc.q;
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用户在web层构造查询条件detachedCriteria,和可选的 bMSD/L
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 E6,`Ld;c[
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PaginationSupport的实例ps。 bv .EM
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ps.getItems()得到已分页好的结果集 Q,[rrG;?@
ps.getIndexes()得到分页索引的数组 #N<s^KYG-
ps.getTotalCount()得到总结果数 ;m-6.AV
ps.getStartIndex()当前分页索引 pP?<[ql[w
ps.getNextIndex()下一页索引 *O2^{ C
ps.getPreviousIndex()上一页索引 cRs{=RGc
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 GM34-GH+
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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 gJWlWVeq$
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一下代码重构了。 &-EyM*:u!
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我把原本我的做法也提供出来供大家讨论吧: Hl4vLx@
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首先,为了实现分页查询,我封装了一个Page类: +lY\r + ;
java代码: hr/xpQW
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/*Created on 2005-4-14*/ jk WBw.(
package org.flyware.util.page; &;uGIk>s
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/** }RC.Q`b
* @author Joa 8ESkG
* jS5t?0
*/ UC?2mdLt^
publicclass Page { 9fr&Yb=_o@
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/** imply if the page has previous page */ *`\4j*$^
privateboolean hasPrePage; <9MQ
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/** imply if the page has next page */ N8/Au=De_
privateboolean hasNextPage; |?pYJkrYO
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/** the number of every page */ Ri%Of:zZ
privateint everyPage; e2VL/>y`
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/** the total page number */ @N:3`[oB
privateint totalPage; :` !mCW`Q-
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/** the number of current page */ \C'I l
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privateint currentPage; '
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/** the begin index of the records by the current X~/9Vd g
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query */ R.n`R|NOd
privateint beginIndex; nG(|7x
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/** The default constructor */ K`AW?p^$Y
public Page(){ H"Em|LX^
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} q=i,'.nS
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/** construct the page by everyPage *Sp O|*'
* @param everyPage wE=8jl*
* */ v(WL 3[y;
public Page(int everyPage){ s9)8{z
this.everyPage = everyPage; PeR<FSF ,i
} ^<H#dkECG
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/** The whole constructor */ 8C4@V[sm`
public Page(boolean hasPrePage, boolean hasNextPage, 085 ^!AZ
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int everyPage, int totalPage, [O =)FiY-
int currentPage, int beginIndex){ yyYbB ]D
this.hasPrePage = hasPrePage; Ffqn|}gb
this.hasNextPage = hasNextPage; 'Y/V9;`)s
this.everyPage = everyPage; n$VPh/
this.totalPage = totalPage; 8*X
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this.currentPage = currentPage; 2LK*Cv[
this.beginIndex = beginIndex; Lzb [%?
} W!Os ci
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/** 5L'@WB|{4u
* @return KLM^O$=
* Returns the beginIndex. U8 @*I>vA
*/ nT6iS}h
publicint getBeginIndex(){ &ppZRdq]
return beginIndex; 0Nzv@g{3
} "g&l~N1$
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/** ~V)VGGOL$v
* @param beginIndex :1Yd;%>92
* The beginIndex to set. p~VW3u]
*/ I.0Usa"z
publicvoid setBeginIndex(int beginIndex){ 1+[|pXT}
this.beginIndex = beginIndex; BwA~*5TFu
} LWR&(p.%
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/** -"b3q
* @return t,Rn
* Returns the currentPage. Wam?(!{mOf
*/ c35vjYQx0
publicint getCurrentPage(){ Fd=`9N9
return currentPage; N`:bvr
} B$eF@v"
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/** v[=E f
* @param currentPage Q ?<9
* The currentPage to set. 9O_N
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*/ W-B[_
publicvoid setCurrentPage(int currentPage){ UjK&`a;V
this.currentPage = currentPage; Dy'l]vN$
} +=xRr?F
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/** lBC-G*#
* @return meWq9:z
* Returns the everyPage. ?Gu>!7
*/ "C|l3X'
publicint getEveryPage(){ nWsz0v3'9
return everyPage; OlFn<:V K
} JQ4>S<ttJ
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/** *a.*Ha
* @param everyPage WHT%m|yn
* The everyPage to set. @=1``z#
*/ 1#uw^{n
publicvoid setEveryPage(int everyPage){ J4X35H=Z
this.everyPage = everyPage; \mGM#E
} DgP%Q
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/** 2"^9t1C2
* @return F4{<;4N0
* Returns the hasNextPage. aC`
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*/ PTqS L]
publicboolean getHasNextPage(){ 8B9zo&
return hasNextPage; Yy 4EM
} }{! #`'s
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