Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 K0#tg^z5d
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 !bY{T#i)k
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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 t3WlVUtq3
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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 ]x Kmz
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分页支持类: 8[Qw8z5-
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java代码: w_Ls.K5"
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package com.javaeye.common.util; V&>7i9lEz
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import java.util.List; AsLAm#zq
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publicclass PaginationSupport { 8sIGJ|ku
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publicfinalstaticint PAGESIZE = 30; `rcjZ^n
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privateint pageSize = PAGESIZE; PFc02 w
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privateList items; jv7zvp
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privateint totalCount; UxW>hbzr&V
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privateint[] indexes = newint[0]; UO&S6M]v7
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privateint startIndex = 0; l(`w]=t&
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public PaginationSupport(List items, int E*ic9Za8`h
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totalCount){ /yOd]N;$
setPageSize(PAGESIZE); '5Y8 rv<
setTotalCount(totalCount); EmH{G
setItems(items); $""[(
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setStartIndex(0); XI0O^[/n{
} U/ZbE?it>
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public PaginationSupport(List items, int 6>"0H/y,
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totalCount, int startIndex){ h!Ka\By8#
setPageSize(PAGESIZE); ve.4""\a
setTotalCount(totalCount); +F/ '+
setItems(items); w&H
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setStartIndex(startIndex); ;?y?s'>t&
} REt()$
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public PaginationSupport(List items, int 8'?e4;O
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totalCount, int pageSize, int startIndex){ \\'!<Bn2d
setPageSize(pageSize); ^GbyA YEp
setTotalCount(totalCount); HU'd/5fun
setItems(items); /M#A[tZ3
setStartIndex(startIndex); p5bH-km6
} YF;8il{p
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publicList getItems(){ CEUR-LK0
return items; W w8[d
} N(
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publicvoid setItems(List items){ Pc$<Cv|vz
this.items = items; =HSE
} LHacHv
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publicint getPageSize(){ +(<CE#bb[
return pageSize; 9(iJ=ao (
} pymT-
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publicvoid setPageSize(int pageSize){ rdC(+2+Ay
this.pageSize = pageSize; Q!"Li
} w@"|S_E
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publicint getTotalCount(){ 9<Bf5d
return totalCount; S`R
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} x3vz4m[
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publicvoid setTotalCount(int totalCount){ Bb1dH/8
if(totalCount > 0){ C[pAa 8
this.totalCount = totalCount; }&!rIU
int count = totalCount / >N*QK6"=|
4];NX
pageSize; h)YqC$A-s
if(totalCount % pageSize > 0) q<7Nz]Td
count++; yx-{}Yj^
indexes = newint[count]; LAr6J
for(int i = 0; i < count; i++){ YY.;J3C
indexes = pageSize * 2=#O4k.@
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} Ohjqdv@
}else{ Z|~<B4#c
this.totalCount = 0; EatpORq
} E7*]t_p"
} VE GUhI/d
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publicint[] getIndexes(){ 5%W3&F6%
return indexes; 7{b|+0W
} S>'wb{jj!
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publicvoid setIndexes(int[] indexes){ O4}cv
this.indexes = indexes; ^ i\zMMR
} Bd7A-T)q!
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publicint getStartIndex(){ ?$o8=h
return startIndex; =|jOio=s:
} )JZfC&,
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publicvoid setStartIndex(int startIndex){ ZLO_5#<
if(totalCount <= 0) =,(Ba'
this.startIndex = 0; 3kJAaI8
elseif(startIndex >= totalCount) R!,RZ?|v
this.startIndex = indexes ,>Yz1P)L
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[indexes.length - 1]; ^beW*O!
elseif(startIndex < 0) xxedezNko
this.startIndex = 0; kDm=Cjxv
else{ z~X] v["d
this.startIndex = indexes 1W-!f%
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[startIndex / pageSize]; s~TYzfA
} "PuP J|
} q!FJP9x
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publicint getNextIndex(){ "3!4 hiU9
int nextIndex = getStartIndex() + @@! R
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pageSize; <x1(}x:u`
if(nextIndex >= totalCount) !IT']kA
return getStartIndex(); sSvQatwS
else ?XeRL<n
return nextIndex; <iTaJa$0m
} dLo%+V#/A
] e&"CF
publicint getPreviousIndex(){ .kBAUkL:
int previousIndex = getStartIndex() - 8^HMK$
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pageSize; 6 C
if(previousIndex < 0) 9}": }!
return0; []u!piW
else E]+W^VG
return previousIndex; e+2!)w)[
} ;}:"[B3$
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} u(d>R5}'
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抽象业务类 `<
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java代码: YwKY3kL
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/** *S;v406
* Created on 2005-7-12 kkqrlJO|
*/ siOeR@>X
package com.javaeye.common.business; k :af
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import java.io.Serializable; U^Hymgb%
import java.util.List; :y]l`Mo -
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import org.hibernate.Criteria; o.sa?*
import org.hibernate.HibernateException; \z<'6,b
import org.hibernate.Session; jz/@Zg",
import org.hibernate.criterion.DetachedCriteria; `yc.A%5
import org.hibernate.criterion.Projections; 2\m+
import nfl6`)oW
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org.springframework.orm.hibernate3.HibernateCallback; lOYwYMi
import 5$N4<Lo7
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org.springframework.orm.hibernate3.support.HibernateDaoS jtl7t59R
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upport; eK`n5Z&Y\
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import com.javaeye.common.util.PaginationSupport; dB< \X.
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public abstract class AbstractManager extends u5%.T0
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HibernateDaoSupport { u:fiil$
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privateboolean cacheQueries = false; #y2="$V
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privateString queryCacheRegion; 0I079fqk<
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publicvoid setCacheQueries(boolean [ bE9Y;
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cacheQueries){ -`#L rO;n
this.cacheQueries = cacheQueries; C{+~x@
} BQt!L1))
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publicvoid setQueryCacheRegion(String fE7[Sk
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queryCacheRegion){ dIMs{!
this.queryCacheRegion = N',]WZ}
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queryCacheRegion; eDIjcZ
} x@ (91f
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publicvoid save(finalObject entity){ ,SS@]9A&
getHibernateTemplate().save(entity); I)9;4lix
} "X"DTP1b
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publicvoid persist(finalObject entity){ sR'rY[^/|
getHibernateTemplate().save(entity); JrS/"QSA
} D)f hk!<
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publicvoid update(finalObject entity){ ^MDBJ0
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getHibernateTemplate().update(entity); Pgs4/
} GS \-
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publicvoid delete(finalObject entity){ .kvuI6H
getHibernateTemplate().delete(entity); B1J+`R3OX
} vQYd!DSh
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publicObject load(finalClass entity, @N"h,(^
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finalSerializable id){ (\,mA-%E
return getHibernateTemplate().load $Ob]JAf}
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(entity, id); Q/-YLf.
} q1`uS^3`
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publicObject get(finalClass entity, ~\Fde^1
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finalSerializable id){ ^FF{71;
return getHibernateTemplate().get J6rXbui$
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(entity, id); 3zMmpeq
} 9F ).i
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publicList findAll(finalClass entity){ `Nc3I\tCM
return getHibernateTemplate().find("from N{L ]H_=
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" + entity.getName()); !fyE
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} &h8+-
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publicList findByNamedQuery(finalString pcoJ\&&W
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namedQuery){ ;{j:5+'
return getHibernateTemplate 7Ja^d-F7
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().findByNamedQuery(namedQuery); wC..LdSR
} =DGaK0n
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publicList findByNamedQuery(finalString query, z2wR]G5!
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finalObject parameter){ /p?h@6h@y
return getHibernateTemplate R8O<}>3a
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().findByNamedQuery(query, parameter); {(7C=)8):
} wa@X^]D8
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publicList findByNamedQuery(finalString query, M@
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finalObject[] parameters){ / QSK$ZDC
return getHibernateTemplate ;'p X1T
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().findByNamedQuery(query, parameters); >=r094<
} 71w
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publicList find(finalString query){ ATPc~f
return getHibernateTemplate().find b6R0za
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(query); \/S?.P#L~
} }7wQFKME
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publicList find(finalString query, finalObject :X,1KR
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parameter){ [[LCEw
return getHibernateTemplate().find xH; 4lw
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(query, parameter); c
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} s:i$ s")
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public PaginationSupport findPageByCriteria f:=q=i
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(final DetachedCriteria detachedCriteria){ 9iUkvnphh
return findPageByCriteria qwiM.b5
*:_xy{m\
(detachedCriteria, PaginationSupport.PAGESIZE, 0); & i)p^AmM
} <?2[]h:wp
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public PaginationSupport findPageByCriteria Y]^[|e8
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(final DetachedCriteria detachedCriteria, finalint "72
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startIndex){ C(xdiQJh
return findPageByCriteria CdC&y}u
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(detachedCriteria, PaginationSupport.PAGESIZE, \; $j
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startIndex); bUU_NqUf*3
} `+Wl
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.
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public PaginationSupport findPageByCriteria jbMzcn~ehI
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(final DetachedCriteria detachedCriteria, finalint `hY%<L sI
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pageSize, WSW aq\9]8
finalint startIndex){ ro|dB
return(PaginationSupport) nhiCV>@y
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getHibernateTemplate().execute(new HibernateCallback(){ X3<<f`X
publicObject doInHibernate dl;^sn0s
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(Session session)throws HibernateException { )Uo)3FAn
Criteria criteria = wRi!eN?
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detachedCriteria.getExecutableCriteria(session); GbBcC#0
int totalCount = w)5eD+n\-
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((Integer) criteria.setProjection(Projections.rowCount |r%6;8A]i
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()).uniqueResult()).intValue(); k`'^e/
criteria.setProjection .ie \3q)
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(null); doW_vu
List items = yAW%y
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criteria.setFirstResult(startIndex).setMaxResults (wo.OH
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(pageSize).list(); l)4KX{Rz{A
PaginationSupport ps = PL%U
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new PaginationSupport(items, totalCount, pageSize, l]uF!']f
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startIndex); ;Ze}i/l
return ps; ?FA} ;?v
} &?#V*-;^
}, true); ?WKFDL'_0j
} L^Fni~
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public List findAllByCriteria(final j[F\f>
LeF Z%y)F
DetachedCriteria detachedCriteria){ Z[[qW
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return(List) getHibernateTemplate )4bBR@QM
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().execute(new HibernateCallback(){ qm{(.b^
publicObject doInHibernate ^"(CZvq
+>M^p2l*&
(Session session)throws HibernateException { |'aGj
Criteria criteria = ~*79rDs{
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detachedCriteria.getExecutableCriteria(session); si.ZTG9m
return criteria.list(); iT227v!s
} RplLU7
}, true); .!/DM-C
} @/9#Z4&d0
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public int getCountByCriteria(final x&@. [FJhO
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DetachedCriteria detachedCriteria){ '-N `u$3Y
Integer count = (Integer) N^*%{[<5
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getHibernateTemplate().execute(new HibernateCallback(){ sf<S#;aYqn
publicObject doInHibernate ~k^rI jR
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(Session session)throws HibernateException { aY@]mMz\
Criteria criteria = EZ:pcnL{
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detachedCriteria.getExecutableCriteria(session); %JF^@\E!|
return p.A_,iE
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criteria.setProjection(Projections.rowCount 6!*be|<&
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()).uniqueResult(); xQ+UZc
} K!Te*?b
}, true); ;h<(vc3@f
return count.intValue(); zo6|1xq
} z$4g9
} ,R#pQ
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用户在web层构造查询条件detachedCriteria,和可选的 +pXYBwH
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 8eq*q
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PaginationSupport的实例ps。
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ps.getItems()得到已分页好的结果集 xvw @'|
ps.getIndexes()得到分页索引的数组 q!iTDg*$
ps.getTotalCount()得到总结果数 { RH&mu
ps.getStartIndex()当前分页索引 )O\w'|$G
ps.getNextIndex()下一页索引 10R#}~D
ps.getPreviousIndex()上一页索引 .);~H#
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 KCP$i@Pjv
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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 M$_E:u&D
0,~||H{
一下代码重构了。 kb3>q($
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我把原本我的做法也提供出来供大家讨论吧: Cm@rXA/
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首先,为了实现分页查询,我封装了一个Page类: nVB.sab
java代码: 3E9 )~$
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/*Created on 2005-4-14*/ la4
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package org.flyware.util.page; S:B$c>
qlSI| @CO
/** *$e1Bv6
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* @author Joa X1*f#3cm#
* :m.6a4vx
*/ )R6h
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publicclass Page { b'q ru~i
X* 4C?v
/** imply if the page has previous page */ I+2#k\y
privateboolean hasPrePage;
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/** imply if the page has next page */ 'h}(> %
privateboolean hasNextPage; w'[JfMu P
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/** the number of every page */ xVxN
@[
privateint everyPage; `PY=B$?{4
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/** the total page number */ [=<vapZt
privateint totalPage; uA-1VwW+N
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/** the number of current page */ O06 2c)vIY
privateint currentPage; /U$5'BoS
,3XlX(P
/** the begin index of the records by the current 6v"WI@b4
=/5^/vwgY
query */ hY5GNYDh
privateint beginIndex; i~3\jD=<
^4/
*kYJwO^
/** The default constructor */ TWSqn'<E
public Page(){ cMs8D
ygK@\JHn
} r4 $<,~
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/** construct the page by everyPage o|G'vMph
* @param everyPage $^:s)Yv
* */ Qm_IU!b
public Page(int everyPage){ W Og pDs
this.everyPage = everyPage; 2dsXG$-W2
} =jEVHIYt
knn9s0'Q
/** The whole constructor */ nsL"'iQ
public Page(boolean hasPrePage, boolean hasNextPage, b>h
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int everyPage, int totalPage, |)VNf.aJZ
int currentPage, int beginIndex){ B>}B{qi|
this.hasPrePage = hasPrePage; C'~Eq3
this.hasNextPage = hasNextPage; vpq"mpfkh
this.everyPage = everyPage; Sw.k,p*r
this.totalPage = totalPage; !C(U9p. 0
this.currentPage = currentPage; ^jbjHI&
this.beginIndex = beginIndex; #<K'RJn
} r2%Qk
+~K)
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/** )O],$\u
* @return ' !2NSv
* Returns the beginIndex. \@[Y~:
*/ buldA5*!o
publicint getBeginIndex(){ R]&lVXyH
return beginIndex; S5BS![-QK
} tWyl&,3?1
E4$y|Ni"
/** !J&UO/q.
* @param beginIndex IG.!M@_
* The beginIndex to set. HTLS$o;Q
*/ 0"}=A,o(w
publicvoid setBeginIndex(int beginIndex){ D&o~4Qvc]
this.beginIndex = beginIndex; `@xnpA]l
} f
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7@R^B =pb
/** LC7%Bfn!
* @return o2D;EUsNX
* Returns the currentPage. ,|g&v/WlC%
*/ aX,6y1
publicint getCurrentPage(){ KV 8Ok
return currentPage; w5 #;Lm
} NR,R.N^[
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/** j.!5&^;u4
* @param currentPage SoWMP2/
* The currentPage to set. n-9a0_{k
*/ uZTbJ3$$
publicvoid setCurrentPage(int currentPage){ 2KlVj]!7
this.currentPage = currentPage; &^`[$LtYd
} >Hu3Guik]
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/** :9DyABK=Cv
* @return \JC_"gqt
* Returns the everyPage.
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*/ 75pn1*"gQ
publicint getEveryPage(){ *JRM(V+IEv
return everyPage; jR9;<qT/
} Q@"}v_r4
)<%CI#s#
/** ^-LnO%h?
* @param everyPage n&!q9CR`
* The everyPage to set. ~Ede5Vg!!2
*/ #@' B\!<@=
publicvoid setEveryPage(int everyPage){ 27i-B\r
this.everyPage = everyPage; l_s#7 .9$
} x~i\*Ox^
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/** _FNW[V
* @return OHwH(}H?
* Returns the hasNextPage. D9 Mst6
*/ ~W-l|-eogz
publicboolean getHasNextPage(){ z6Fl$FFP
return hasNextPage; ZA&bp{}D
} mBEMwJ}O`
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/** k]A=Q
* @param hasNextPage nq,:UYNJ
* The hasNextPage to set. R|k:8v{V=
*/ @EURp
publicvoid setHasNextPage(boolean hasNextPage){ p1[|5r5Day
this.hasNextPage = hasNextPage; +f$
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} od$$g(
~# \{'<
/** <00nu'Ex1v
* @return '9'f\
* Returns the hasPrePage. &1Y7Ne
*/ JC`;hY
publicboolean getHasPrePage(){ \irKM8]LJ
return hasPrePage; :L6%57
} (/^?$~m"
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/** mN
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* @param hasPrePage 2kOaKH[(q
* The hasPrePage to set. P^ht$)Y
*/ >sdF:(JV&
publicvoid setHasPrePage(boolean hasPrePage){ x[fp7*TiG
this.hasPrePage = hasPrePage; %__ @G_M
} &G[W$2`@
&> _aY #
/** y<~(}xsHh
* @return Returns the totalPage. C8do8$
* ]<ay_w;
*/ g6xQQ,q=l
publicint getTotalPage(){ {t4':{Y+
return totalPage; ]T(qk
} K47.zu
p.<d+S<
/** S|;}]6p
* @param totalPage unRFcjEa
* The totalPage to set. O>I%O^
*/ 1H\5E~X
publicvoid setTotalPage(int totalPage){ <Fv7JPN%
this.totalPage = totalPage; PN=5ICT
} VZe'6?#
Z%b1B<u$
} Y9
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9xK#(M
6(7dr?^eGT
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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 IGo5b-ds
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个PageUtil,负责对Page对象进行构造: ILiOEwHS7F
java代码: (LMT '
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/*Created on 2005-4-14*/ 5Q:49S47
package org.flyware.util.page; 5Vdy:l
#s#BYbF
import org.apache.commons.logging.Log; E$A=*-u
import org.apache.commons.logging.LogFactory; ~0o>B$xJ
|eFaOL|
/** W<TfDEEa
* @author Joa 2|(lKFkQ
* 1. <g C
*/ &T ^bv*P
publicclass PageUtil { 7AqbfLO
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privatestaticfinal Log logger = LogFactory.getLog (dx~lMI
@k# xr
(PageUtil.class); T1 1>&K)
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/** 3hEbM'L
* Use the origin page to create a new page KdzV^6K<c
* @param page >wFn|7\)s>
* @param totalRecords 'c]Pm,Ls
* @return dB QCr{7
*/ ka{!' ^
publicstatic Page createPage(Page page, int wbk$(P'gN
S)'&+HamI
totalRecords){ 7osHKO<?2
return createPage(page.getEveryPage(), l<(jm{q?u
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page.getCurrentPage(), totalRecords); PCa0I^d
} b `}hw"f
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/** !9.\A:G
* the basic page utils not including exception F}@]Lq+
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handler JL<<EPC
* @param everyPage }I#_H
* @param currentPage v-"nyy-&Z
* @param totalRecords !kH 1|
* @return page cFq2 6(e
*/ \JCpwNT{P
publicstatic Page createPage(int everyPage, int H
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currentPage, int totalRecords){ m%.[|sZ3EM
everyPage = getEveryPage(everyPage); gO@LJ
currentPage = getCurrentPage(currentPage); uu>R)iTQ%S
int beginIndex = getBeginIndex(everyPage, 9C!b
f \
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currentPage); 9T1-{s
R
int totalPage = getTotalPage(everyPage, )t:8;;W@Ir
2r]o>X
totalRecords); Ysw&J}6e
boolean hasNextPage = hasNextPage(currentPage, ~at:\h4:
T&:~=
totalPage); WA*1_
boolean hasPrePage = hasPrePage(currentPage); M!%|IKw
-3m!970
returnnew Page(hasPrePage, hasNextPage, t8.3
everyPage, totalPage, |eJR3o
currentPage, X+N8r^&
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beginIndex); `7?EE1o
} Q~rE+?n9F
41Ab,
privatestaticint getEveryPage(int everyPage){ pTncx%!W5
return everyPage == 0 ? 10 : everyPage; kjOkPp
} lg{/5gQG
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privatestaticint getCurrentPage(int currentPage){ `}FZ;q3DP
return currentPage == 0 ? 1 : currentPage; /*GCuc|
} Y'#uZA3KA
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privatestaticint getBeginIndex(int everyPage, int SO<9?uk.
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currentPage){ &;<'AF
return(currentPage - 1) * everyPage; qG]0z_dPE~
} ]*Kv[%r07c
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privatestaticint getTotalPage(int everyPage, int 1xO-tIp/
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totalRecords){ %u2",eHCB
int totalPage = 0; 4[Wwm
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if(totalRecords % everyPage == 0) PY&mLux%
totalPage = totalRecords / everyPage; m3&