Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 }>93X0%r
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 T 6ihEb$C
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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 mV>l`&K=
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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 '@0Z#A
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分页支持类: k3PFCl~e
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java代码: uqotVil,
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package com.javaeye.common.util; %~e+H|
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import java.util.List;
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publicclass PaginationSupport {
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publicfinalstaticint PAGESIZE = 30; bmzY^ %a
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privateint pageSize = PAGESIZE; .IU\wN
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privateList items; Iwx~kvz\_(
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privateint totalCount; F G:t2ea
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privateint[] indexes = newint[0]; #lfW0?Y'
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privateint startIndex = 0; +dG3/vV
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public PaginationSupport(List items, int ?S<`*O
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totalCount){ \Ota~A
setPageSize(PAGESIZE); sRI0;
setTotalCount(totalCount); ^7Rc\
setItems(items); 3<x1s2U
setStartIndex(0); ,+4*\yI3l
} un F=";9H
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public PaginationSupport(List items, int Z35(f0b
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totalCount, int startIndex){ EJW}&e/
setPageSize(PAGESIZE); }`pxs
setTotalCount(totalCount); oh0*b h
setItems(items); -Hh.8(!XoO
setStartIndex(startIndex); gy`WBg(7x
} |yinV fZ0C
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public PaginationSupport(List items, int \
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totalCount, int pageSize, int startIndex){ ^)E#
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setPageSize(pageSize); HfPu~P
setTotalCount(totalCount); ^]NFr*'!
setItems(items); Bwc_N.w?3
setStartIndex(startIndex); _Rb>py
} *e25!#o1
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publicList getItems(){ 2EH0d6nt
return items; Ya&\ b 6
} ffQm"s:P
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publicvoid setItems(List items){ #9glGPR(
this.items = items; +-!2nk`"a
} l*w*e.ezQ
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publicint getPageSize(){ /o^/J~/3
return pageSize; _+9o'<#u(
} ny"z<N&}/
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publicvoid setPageSize(int pageSize){ f+lPQIB
this.pageSize = pageSize; W6s-epsRmT
} .*X=JFxl
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publicint getTotalCount(){ ]
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return totalCount; VfFbZds8f
} %i.Prckrb
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publicvoid setTotalCount(int totalCount){ |s,y/svp
if(totalCount > 0){ K: |-s4=
this.totalCount = totalCount; h])oo:u'/Q
int count = totalCount / N /zP!%L
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pageSize; ,u=+%6b)A
if(totalCount % pageSize > 0) zHKx,]9b
count++; UyAy?i8K
indexes = newint[count]; }tO>&$
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for(int i = 0; i < count; i++){ )x<BeD
indexes = pageSize * OtbPrF5
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} NX5$x/uz
}else{ .^6yCs5~`
this.totalCount = 0; :'FCeS9
} DP-0,Gt&Xj
} )b1X6w[
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publicint[] getIndexes(){ \YSprXe
return indexes; 1H?I?IT30
} w*]FJ-b<.j
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publicvoid setIndexes(int[] indexes){ [tR b{JsUd
this.indexes = indexes; ~RH)iI
} ";;!c. !^
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publicint getStartIndex(){ >Q=Q%~
return startIndex; P;eXUF+jn
} m8V}E&6
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publicvoid setStartIndex(int startIndex){ `2/V.REX$h
if(totalCount <= 0) yJ="dEn>i"
this.startIndex = 0; dZo x;_b
elseif(startIndex >= totalCount) {:|b,ep
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this.startIndex = indexes tXuf !
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[indexes.length - 1]; fRT4>So
elseif(startIndex < 0) mL-6+pJ@
this.startIndex = 0; +4Fw13ADE
else{ 1Ko4O)L]&
this.startIndex = indexes &WeN{
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[startIndex / pageSize]; ?E<9H/
} W4bN']?
} M!D6i5k,
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publicint getNextIndex(){ 'Z]wh .]T
int nextIndex = getStartIndex() + NTEN
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pageSize; d tE"1nR
if(nextIndex >= totalCount) NwxDxIIH/)
return getStartIndex(); '\GU(j
else 1:r#m- \
return nextIndex; {5fL!`6w
} O~v~s
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publicint getPreviousIndex(){ K&,";9c
int previousIndex = getStartIndex() - tLxeq?Oo]
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pageSize; &E1m{gB(
if(previousIndex < 0) Y;'SD{On
return0; $}'(%\7"
else Zu<S<??Jf
return previousIndex; -w>ss&
} d"n"A?nXh
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} J7qTE8 W=
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抽象业务类 I~6 o<HO
java代码: $4}G
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/** B,&QI&k`~
* Created on 2005-7-12 y=.bn!u}z
*/ ->X>h_k.Y
package com.javaeye.common.business; HOF=qE*p
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import java.io.Serializable; aj,o<J
import java.util.List; NuOxEyC
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import org.hibernate.Criteria; ;TS%e[lFhQ
import org.hibernate.HibernateException; Zxhbnl6
import org.hibernate.Session; YaL:6[6
import org.hibernate.criterion.DetachedCriteria; OScqf]H
import org.hibernate.criterion.Projections; s2GF*{
import (KwC,0p
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org.springframework.orm.hibernate3.HibernateCallback; 1q@R04i
import 4P"bOt5izR
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org.springframework.orm.hibernate3.support.HibernateDaoS I{r*Y9
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upport; ZHa>8x;Mjl
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import com.javaeye.common.util.PaginationSupport; kY!zBk
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public abstract class AbstractManager extends F>3 o0ke}
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HibernateDaoSupport { E1tCY.N{
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privateboolean cacheQueries = false; 8e3eQ
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privateString queryCacheRegion; q*|Alrm
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publicvoid setCacheQueries(boolean K5|~iW'
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cacheQueries){ HZZZ [km
this.cacheQueries = cacheQueries; P.5l9Ns(O
} L<0_e^8
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publicvoid setQueryCacheRegion(String Z/:F)c,x
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queryCacheRegion){ aK95&Jyw&
this.queryCacheRegion = hc+B+-,
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queryCacheRegion; (tOhuSW
} G_J}^B*?%v
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publicvoid save(finalObject entity){ DU$#tg}{
getHibernateTemplate().save(entity); 5h`L W AB
} )\ceanS
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publicvoid persist(finalObject entity){ E:ci/09wD
getHibernateTemplate().save(entity); BWy-R6br
} {_\cd.AuT
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publicvoid update(finalObject entity){ /\b*
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getHibernateTemplate().update(entity); *jbPy?%oY
}
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publicvoid delete(finalObject entity){ 3
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getHibernateTemplate().delete(entity); !cYID \}S,
} X,_K
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publicObject load(finalClass entity, c6#E gN,X
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finalSerializable id){ =g!Pw]
return getHibernateTemplate().load D|*w6p("z
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(entity, id); Wp8>Gfb2
} Ycspdl+(S$
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publicObject get(finalClass entity, Vjv6d&Q
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finalSerializable id){ fc8ODk*;E
return getHibernateTemplate().get k|?[EWIi^
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(entity, id); *
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} &C+2p
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publicList findAll(finalClass entity){ 1h?ve,$
return getHibernateTemplate().find("from 1x;@BV
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" + entity.getName()); ZxSFElDD]E
} <tFq^qB
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publicList findByNamedQuery(finalString a;Y:UwD9*
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namedQuery){ 1Ub=RyB
return getHibernateTemplate 9QXsbd6
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().findByNamedQuery(namedQuery); <_<zrXc]
} g"5Kth
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publicList findByNamedQuery(finalString query, eG!ma` v
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finalObject parameter){ W1X3ArP]m8
return getHibernateTemplate Ovk=s,a)K
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().findByNamedQuery(query, parameter); qX5>[qf-
} [YULvWAJ
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publicList findByNamedQuery(finalString query, 7uL.=th'
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finalObject[] parameters){ = NZgbl
return getHibernateTemplate f0sLe 3
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().findByNamedQuery(query, parameters); TS9<uRO0
} u1 M8nb
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publicList find(finalString query){ mI,lW|/l,
return getHibernateTemplate().find /\- }-"dm
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(query); 0a{hCx|$J
} 7`J2/(
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publicList find(finalString query, finalObject )~=8Ssu
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parameter){ 2K};-}eW
return getHibernateTemplate().find <hCO-r#
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(query, parameter); VtI`Qcjc
} [(x*!,=
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public PaginationSupport findPageByCriteria $Bz};@
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(final DetachedCriteria detachedCriteria){ 4bA^Gq
return findPageByCriteria 7:?\1a
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); AaA!U!B
} "NLuAB.P
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public PaginationSupport findPageByCriteria o}:x-Y
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(final DetachedCriteria detachedCriteria, finalint "[?DS
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startIndex){ iZy>V$Aq
return findPageByCriteria dB6,pY(
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(detachedCriteria, PaginationSupport.PAGESIZE, 5s3QN{h8
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startIndex); ?g4Rk9<!i
} V /2NIh
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public PaginationSupport findPageByCriteria CdRJ@Lf
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(final DetachedCriteria detachedCriteria, finalint GxD`M2
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pageSize, aUEr& $
finalint startIndex){ ,b!D8{W"N
return(PaginationSupport) V9$T=[
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getHibernateTemplate().execute(new HibernateCallback(){ i8e*9;4@
publicObject doInHibernate T{Xd >
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(Session session)throws HibernateException { o{#aF=`{
Criteria criteria = ?V!5VHa
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detachedCriteria.getExecutableCriteria(session); '4i8&p`/
int totalCount = Cwls e-
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((Integer) criteria.setProjection(Projections.rowCount G8+&fn6
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()).uniqueResult()).intValue(); Z[*unIk
criteria.setProjection lH=|Qu
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(null); 85G-`T
List items = (+(@P*c1
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criteria.setFirstResult(startIndex).setMaxResults 6ScB:8M
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(pageSize).list(); ph5{i2U0
PaginationSupport ps = ;]grbqXVE
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new PaginationSupport(items, totalCount, pageSize, $L0sBW&
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startIndex); 8k-]u3
return ps; e7"T37
} X$6NJ(2G
}, true); 2T+-[}*
} e,}h^^"
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public List findAllByCriteria(final
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DetachedCriteria detachedCriteria){ ;:
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return(List) getHibernateTemplate =U*D.p*%f
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().execute(new HibernateCallback(){ >Vt2@Ee
publicObject doInHibernate rz_W]/G-P
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(Session session)throws HibernateException { I?g}q,!]
Criteria criteria = IXtG
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detachedCriteria.getExecutableCriteria(session); -)(=~|,Pq/
return criteria.list(); ~|S0E:*.
} (CIcM3|9C
}, true); \ZADY.ha
} q&z'S
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public int getCountByCriteria(final F|>
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DetachedCriteria detachedCriteria){ 3ArHaAv{y
Integer count = (Integer) FulFEnSV
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getHibernateTemplate().execute(new HibernateCallback(){ ,on]Fts
publicObject doInHibernate C5V}L
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(Session session)throws HibernateException { *]U`]!Esp
Criteria criteria = N\__a~'0p
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detachedCriteria.getExecutableCriteria(session); Qb?a[[3
return !gW`xVGv
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criteria.setProjection(Projections.rowCount o+{,>t
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()).uniqueResult(); Jfr'OD2$ %
} WT,I~'r=S
}, true); 5n2!Y\
return count.intValue(); n',X,P0
} !1I# L!9
} )M0(vog
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用户在web层构造查询条件detachedCriteria,和可选的 bgBvzV&'8
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 r2\%/9uO
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PaginationSupport的实例ps。 zGU MH7 M
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ps.getItems()得到已分页好的结果集 Vv+nq_
ps.getIndexes()得到分页索引的数组 7<]&pSt=
ps.getTotalCount()得到总结果数 %OgK{h
ps.getStartIndex()当前分页索引 i
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ps.getNextIndex()下一页索引 K_L7a>Fr
ps.getPreviousIndex()上一页索引 $7AsMlq[(
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 :'wxm3f
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 n+sv2Wv:
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一下代码重构了。 Yf9E0po
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我把原本我的做法也提供出来供大家讨论吧: wp1O*)/q
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首先,为了实现分页查询,我封装了一个Page类: xwsl$Rj
java代码: agwbjkU/
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/*Created on 2005-4-14*/
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package org.flyware.util.page; kum@cA
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/** %TN$
* @author Joa ,YM=?No
* rR@]`@9
*/ ]_B<K5
publicclass Page { }Y!V3s1bm
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/** imply if the page has previous page */ \m)s"Sh.
privateboolean hasPrePage; C0w_pu
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/** imply if the page has next page */ (ww4(
privateboolean hasNextPage; KB~[nZs7
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/** the number of every page */ 7hn[i,?`
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privateint everyPage; 7#"NKxb
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/** the total page number */ cu}(\a
privateint totalPage; 4qDO(YWf
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/** the number of current page */ qfT9g>EF
privateint currentPage; c}OveR$'&
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/** the begin index of the records by the current a K6dy\
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query */ 90+Vw`Gz=
privateint beginIndex; /'{vDxZf R
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/** The default constructor */ R-pON4D"*
public Page(){ 1d49&-N
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} -ABj>y[
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/** construct the page by everyPage )( 3)^/Xz
* @param everyPage t9<BQg
* */ }!fIY7gv
public Page(int everyPage){ 1 M!4hM
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this.everyPage = everyPage; f1SKOq
} O2 Y|<m
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/** The whole constructor */ oNXYBeu+
public Page(boolean hasPrePage, boolean hasNextPage, Iw[zN[oz
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int everyPage, int totalPage, .6[8$8c
int currentPage, int beginIndex){ .sit5BX
this.hasPrePage = hasPrePage; nl2Lqu1
this.hasNextPage = hasNextPage; Jityb}Z"
this.everyPage = everyPage; OF1^_s;
this.totalPage = totalPage; BIMX2.S1o
this.currentPage = currentPage; [YlRz
this.beginIndex = beginIndex; $ H@
} oAN,_1v)
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/** ozS'n]8*
* @return 4Kj8i
* Returns the beginIndex. qYe`</
*/ .DwiIr'
publicint getBeginIndex(){ uh9b!8
return beginIndex; V
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} z I9jxwXU
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/** Fi+DG?zu
* @param beginIndex G$*=9`
* The beginIndex to set. jm&[8ApW
*/ .3+8Ip#z
publicvoid setBeginIndex(int beginIndex){ ~g[D!HV|yu
this.beginIndex = beginIndex; `TF3Ho\MC
} a>#$&&oQ0
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/** .yTo)t
* @return 3k6Dbz
* Returns the currentPage. ZiKO|U@/
*/ uHf1b?W
publicint getCurrentPage(){ .I{u[
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return currentPage; ;gHcDnH)
} e"EGqn&!
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/** DfkGNBY
* @param currentPage @CR<&^s5V
* The currentPage to set. #l)o<Z
*/ , =*^XlO=c
publicvoid setCurrentPage(int currentPage){ 1A;,"8kBd
this.currentPage = currentPage; WB (?6"
} "<^
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/** Qe7
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* @return o^uh3,.
* Returns the everyPage. Ia9!ucN7DA
*/ ?o]NV
publicint getEveryPage(){ _^eA1}3
return everyPage; Wvd-be
} nF3Sfw,
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/** ~tNk\Kkv
* @param everyPage ~P!=fU)
* The everyPage to set. =<M>fJ)
*/ /HqD4GDoug
publicvoid setEveryPage(int everyPage){ [D?xd/G
this.everyPage = everyPage; %PR,TWe
} e7Gb7c~
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/** fe6Op
* @return D@{m
* Returns the hasNextPage. d`?EEO
*/ $WE_aNfja
publicboolean getHasNextPage(){ %0815
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return hasNextPage; <T'fJcR
} b5|l8<\
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/** `yhc,5M
* @param hasNextPage ][OkydE
* The hasNextPage to set. +K=RM qM-8
*/ geM`O|Np
publicvoid setHasNextPage(boolean hasNextPage){ sSiZG
this.hasNextPage = hasNextPage; L^s?EqLXS
} F')E)tV
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/** T sJ71
* @return /3"S_KE1@+
* Returns the hasPrePage. &