Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 s- 0Xt<
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 }S13]Kk?=
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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 een62-`
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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 rd[mC[
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分页支持类: wnLpf
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java代码: 8(S|=c R
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package com.javaeye.common.util; pjSM7PhQ
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import java.util.List; QAZs1;lU
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publicclass PaginationSupport { 55y{9.n*
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publicfinalstaticint PAGESIZE = 30; _@y9=e
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privateint pageSize = PAGESIZE; $~
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privateList items; CR#-!_=4
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privateint totalCount; AAB_Ytf
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privateint[] indexes = newint[0]; o`'4EVw*
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privateint startIndex = 0; UalwK
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public PaginationSupport(List items, int ;9J6)zg !n
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totalCount){ 5,|{|/
setPageSize(PAGESIZE); H,j_2JOY=
setTotalCount(totalCount); N"~P$B1X
setItems(items); r(n>N0:0Ls
setStartIndex(0); X;vUz
} 8hyXHe
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public PaginationSupport(List items, int jgkY^l
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totalCount, int startIndex){ /~+Fzz
setPageSize(PAGESIZE); 0Q
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setTotalCount(totalCount);
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setItems(items); @|'9nPern
setStartIndex(startIndex); kKC]
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} Sb)}
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public PaginationSupport(List items, int a/%qn-i|p
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totalCount, int pageSize, int startIndex){ $V/Ke
setPageSize(pageSize); b 1."mT!p
setTotalCount(totalCount); G2|G}#E
setItems(items); , BZ(-M
setStartIndex(startIndex); 0+e0<'
} X?`mYoe
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publicList getItems(){ nKTi"2dm
return items; a785xSUV
} Wm)Id_
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publicvoid setItems(List items){ Un5 AStG
this.items = items; AkO-PL
} &{q'$oF
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publicint getPageSize(){ r.=.,R
return pageSize; cnG>EG
} Sm|TDH
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publicvoid setPageSize(int pageSize){ n+vv
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this.pageSize = pageSize; 5fmQ+2AC1
} ?PV@WrU>B
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publicint getTotalCount(){ t[G7&ovj
return totalCount; )$*B
} vP%:\u:{
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publicvoid setTotalCount(int totalCount){ z>
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if(totalCount > 0){ 2Z`Jr/
this.totalCount = totalCount; P4E_<v[
int count = totalCount / l)EtK&er(}
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pageSize; : 'pK
if(totalCount % pageSize > 0) W(.svJUgb.
count++; /}CAd
indexes = newint[count]; *ck'vV'@
for(int i = 0; i < count; i++){ CT<z1)#@^
indexes = pageSize * '3E25BsL
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} QG@Z%P~,E
}else{ ,E+\SBQS_
this.totalCount = 0; dXU6TCjU7
} AD6 b
} &oFgZ .
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publicint[] getIndexes(){ 9'ky2
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return indexes; _skE\7&>X
} 7Q&S [])
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publicvoid setIndexes(int[] indexes){ %PK(Z*>
this.indexes = indexes; J DOs.w
} 4#ifm#
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publicint getStartIndex(){ :"Rx$;a
return startIndex; Emk:@$3{r
} +NOq>kH@
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publicvoid setStartIndex(int startIndex){ U\[b qw
if(totalCount <= 0) G^/8^Zi
this.startIndex = 0; )31xl6@
elseif(startIndex >= totalCount) C7&L9k~jf
this.startIndex = indexes &.Yu%=}
#X?E#^6?E
[indexes.length - 1]; /d$kz&aIV
elseif(startIndex < 0) v<| iN#
this.startIndex = 0; 1Z_ H%(
else{
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this.startIndex = indexes w3ZOCWJS
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[startIndex / pageSize]; @ xTVX'$
} wV4MP1c$
} Nfmr5MU_
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publicint getNextIndex(){ vJb/.)gh]
int nextIndex = getStartIndex() + j`MK\*qmz
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pageSize; +9#qNkP
if(nextIndex >= totalCount) W"tGCnd
return getStartIndex(); #smfOGSd
else 58o&Dv6?
return nextIndex; U.N&~S
} Xl>ZnI];
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publicint getPreviousIndex(){ Pup%lO`.0
int previousIndex = getStartIndex() - =n8M'
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pageSize; >.hDt9@4
if(previousIndex < 0)
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return0; (/!zHq
else !H6X%hlk
return previousIndex; bj?=\u
} <J.q[fd1*
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} V&lx0Dy
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抽象业务类 6E_YUk?KW
java代码: =(v'8?--
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/** LeNSjxB
* Created on 2005-7-12 m'uFj !
*/ 7{NH;U t
package com.javaeye.common.business; C879eeJ
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import java.io.Serializable; q/qig5Ou
import java.util.List; h)z2#qfc
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import org.hibernate.Criteria; oZi{v]4
import org.hibernate.HibernateException; }gd'pgN"t
import org.hibernate.Session; KNOVb=#f_
import org.hibernate.criterion.DetachedCriteria; *lQa^F
import org.hibernate.criterion.Projections; CKC5S^Mx
import A5sz[k
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org.springframework.orm.hibernate3.HibernateCallback; ^RYq !l$
import Nc?'},
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org.springframework.orm.hibernate3.support.HibernateDaoS lA4TWU (]
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upport; 9d!mGnl
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import com.javaeye.common.util.PaginationSupport; 4Ujy_E?^
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public abstract class AbstractManager extends Epm8S}6K
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HibernateDaoSupport { ;ssI8\LG
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privateboolean cacheQueries = false; c Ze59
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privateString queryCacheRegion; as[! 9tB]
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publicvoid setCacheQueries(boolean Hk=HO|&<XB
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cacheQueries){ S7~HBgS<
this.cacheQueries = cacheQueries; bo@,
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} z8xBq%97us
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publicvoid setQueryCacheRegion(String @R (Op|9
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queryCacheRegion){ i4&V+h"
this.queryCacheRegion = Ns5P,[pBOZ
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queryCacheRegion; K\.tR
} A,3qjd,$ c
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publicvoid save(finalObject entity){ E5Sn mxd
getHibernateTemplate().save(entity); p+y"r4
} ?F*I2rt#
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5 {
publicvoid persist(finalObject entity){ S27s Rxfr
getHibernateTemplate().save(entity); QXgfjo
} n+nZ;GJ5d
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publicvoid update(finalObject entity){ @ 'U`a4
getHibernateTemplate().update(entity); 6Xbf3So
} Q2F20b
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publicvoid delete(finalObject entity){ WuTkYiF
getHibernateTemplate().delete(entity); L$y~\1-
} z";(0%
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publicObject load(finalClass entity, s^Xs*T@~h
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finalSerializable id){ ]bYmM@
return getHibernateTemplate().load g1(5QWb
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(entity, id); ab]Q1kD
} hFxT@I~
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publicObject get(finalClass entity, @a,=ApS"
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finalSerializable id){ A;o({9VH`Z
return getHibernateTemplate().get Ge^,hAM'
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(entity, id); (!YJ:,!so
} $aN%[
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publicList findAll(finalClass entity){ *B9xL[}
return getHibernateTemplate().find("from )<qL8#["U
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" + entity.getName()); Gl[1K/,*
} XL'\$f
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publicList findByNamedQuery(finalString +wQ}ZP&
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namedQuery){ M0OIcMTv
return getHibernateTemplate k4E9=y?
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().findByNamedQuery(namedQuery); Kf_xKW)^
} 7PBE(d%m
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publicList findByNamedQuery(finalString query, 0j8`M"6
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finalObject parameter){ %~,Fe7#p
return getHibernateTemplate W1Ye+vg/s
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().findByNamedQuery(query, parameter); %s^1 de
} G;EJ\J6@Yw
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publicList findByNamedQuery(finalString query, 'f.k'2T
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finalObject[] parameters){ e,lLHg
return getHibernateTemplate ]E'?#z.t
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().findByNamedQuery(query, parameters); xEeHQ7J
} N
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publicList find(finalString query){ .k
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return getHibernateTemplate().find radP%W-U
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(query); gGx(mX._L?
} {J,4g:4G
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publicList find(finalString query, finalObject {<-wm-]mo
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parameter){ S\Le;,5Z
return getHibernateTemplate().find l-S0Gn/'X
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(query, parameter); o>bi~(H
} (:?bQA'Td
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public PaginationSupport findPageByCriteria 5SmJ'zFO
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(final DetachedCriteria detachedCriteria){ J9DI(`
return findPageByCriteria #
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); u3E =r
} <5P*uZ
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public PaginationSupport findPageByCriteria %Lb
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(final DetachedCriteria detachedCriteria, finalint c2fSpvz
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startIndex){ <W) F{N?
return findPageByCriteria MNb9 ~kM
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(detachedCriteria, PaginationSupport.PAGESIZE, 9yWf*s<
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startIndex); e6
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} /e^) *r
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public PaginationSupport findPageByCriteria @!O(%0
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DT)][V^w
(final DetachedCriteria detachedCriteria, finalint 8{ =ha
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pageSize, lSO$Q]!9
finalint startIndex){ '
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return(PaginationSupport) Un,'a8>V`
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getHibernateTemplate().execute(new HibernateCallback(){ -.ZP<,?@F
publicObject doInHibernate :N"&o(^
qu dY9_
(Session session)throws HibernateException { [@8 po-()L
Criteria criteria = kWy@wPqms
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detachedCriteria.getExecutableCriteria(session); D6+3f#k6
int totalCount = "5O>egt
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((Integer) criteria.setProjection(Projections.rowCount $Bl51VjN
UnYb}rF#%
()).uniqueResult()).intValue(); O>a1S*mxP
criteria.setProjection ccPWfy_
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(null); D!/ 4u0m
List items = /h.{g0Xc
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criteria.setFirstResult(startIndex).setMaxResults #62ThH~
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(pageSize).list(); b6sf1E
PaginationSupport ps = ,|>>z#Rr(n
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new PaginationSupport(items, totalCount, pageSize, EzjK{v">
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startIndex); jw{B8<@s
return ps; ->.9[|lIg
} ",Vx.LV
}, true); RWo7_X O
} wvxz:~M
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public List findAllByCriteria(final g1"ZpD
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DetachedCriteria detachedCriteria){ J'7;+.s(
return(List) getHibernateTemplate GEh( pJ
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().execute(new HibernateCallback(){ x=Oy 6"
publicObject doInHibernate D1 v0`od'
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(Session session)throws HibernateException { ;v2eAe@7
Criteria criteria = 0)~c)B:5
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detachedCriteria.getExecutableCriteria(session); QRBx}!:NZ#
return criteria.list(); vt*
} ~ss6yQ$
}, true); ruB D
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} g<M!]0OK
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public int getCountByCriteria(final ~9vK6;0
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DetachedCriteria detachedCriteria){ j|K;Yi
Integer count = (Integer) r<!nU&FPD:
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getHibernateTemplate().execute(new HibernateCallback(){ t&q~ya/C
publicObject doInHibernate w4\
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(Session session)throws HibernateException { N#"l82^H*
Criteria criteria = I^ ![)# FC
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detachedCriteria.getExecutableCriteria(session); \y(3b#
return 7(h@5
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criteria.setProjection(Projections.rowCount U4K ZPk
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()).uniqueResult(); .udLMS/_
} S2*sh2-&6
}, true); 43M.Hj]
return count.intValue(); jK*d
} ZCc23UwI
} Pvi2j&W84
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};9s8VZE
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用户在web层构造查询条件detachedCriteria,和可选的 4=|Q2qgFV
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 NiW9/(;xB
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PaginationSupport的实例ps。 W4 d32+V
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ps.getItems()得到已分页好的结果集 ``VE<:2+
ps.getIndexes()得到分页索引的数组 NFEr ,n
ps.getTotalCount()得到总结果数 {%9@{Q'T.s
ps.getStartIndex()当前分页索引 #\Rxqh7
ps.getNextIndex()下一页索引 ;)CN=J!
ps.getPreviousIndex()上一页索引 : q%1Vi
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 7:uz{xPK6
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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 0'pB7^y
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一下代码重构了。
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我把原本我的做法也提供出来供大家讨论吧: J.4U;A5
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首先,为了实现分页查询,我封装了一个Page类: HOWpTu(
java代码: qQ3Q4R\
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/*Created on 2005-4-14*/ |au`ph5
package org.flyware.util.page; K\U`gTGc
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/** |*g#7YL
* @author Joa CA`V)XIsP
* =&UE67eK,
*/ Evm3Sm!S
publicclass Page {
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/** imply if the page has previous page */ 0/f|ZH ~!
privateboolean hasPrePage; MjC<N[WO>N
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/** imply if the page has next page */ :h34mNU
privateboolean hasNextPage; HLPRTta.
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/** the number of every page */ #
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privateint everyPage; `Ze$Bd\
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/** the total page number */ |wuTw|
privateint totalPage; Fn`Zw:vp6
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/** the number of current page */ U~ a\v8l~
privateint currentPage; TM#L.xPMf
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/** the begin index of the records by the current iU 6,B
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query */ 7 "'PfP4c
privateint beginIndex; A? B+
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/** The default constructor */ =bD.5,F)
public Page(){ >fP;H}S6
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} AH'c:w]~
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/** construct the page by everyPage TX$dxHSPK
* @param everyPage GBBr[}y-
* */ 7M~ /
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public Page(int everyPage){ Psx"[2iZm
this.everyPage = everyPage; u5ZyOZ;
} LBD],Ba!
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/** The whole constructor */ AzJ;EtR
public Page(boolean hasPrePage, boolean hasNextPage, ]}b
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int everyPage, int totalPage, Rf`_q7fm
int currentPage, int beginIndex){ 8=Oym~
this.hasPrePage = hasPrePage; &UnhYG{A
this.hasNextPage = hasNextPage; J7",fb
this.everyPage = everyPage; Wm-$l
this.totalPage = totalPage; qZ[HILh!
this.currentPage = currentPage; Gf#l ^yr
this.beginIndex = beginIndex; 8f~x\.
} ] \|2=
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/** )N- '~<N
* @return .>TG{>sH
* Returns the beginIndex. E@k'uyIu
*/ r@r*|50
publicint getBeginIndex(){ R3og]=uFzm
return beginIndex; b1#C,UWK
} a"YVr'|
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/** cA4?[F
* @param beginIndex q
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* The beginIndex to set. #'KM$l,P
*/ pm=O.)g4`
publicvoid setBeginIndex(int beginIndex){ c"kB @P
this.beginIndex = beginIndex; 9Cd/SlNV2
} iT{4-j7|P4
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/** .?3roQ
* @return M x,5
* Returns the currentPage. V2?{ebx`
*/ U1/I(w
publicint getCurrentPage(){ [I%eRo[
return currentPage; %Bm{ctf#)
} T2]8w1l&K
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/** z6M5'$\y
* @param currentPage 6<\dQ+~
* The currentPage to set. S_Nm?;P
*/ Ji,;ri2i
publicvoid setCurrentPage(int currentPage){ bQI :N
this.currentPage = currentPage; i03S9J
} |7,$.MK-@
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/** <?KgzIq2
* @return ^pe/~ :a
* Returns the everyPage. V}<<?_
*/ \ CcVk"/
publicint getEveryPage(){ 7^rT-f07
return everyPage; kb~
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} 4Yok,<
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/** K'8?%&IQ
* @param everyPage n7ZJ< ~wl
* The everyPage to set. l<=k#d
*/ -6_<]
publicvoid setEveryPage(int everyPage){ /o$6"~t
this.everyPage = everyPage; fl4@5AVY
} ]5*H/8Ke7
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/** t4;gY298
* @return P;y!Y/$ C
* Returns the hasNextPage. hA/Es?U]
*/ z<