Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ie95rZp
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 SHgN~Um
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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 ZvX*t)VjTz
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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 F~W6Bp^W
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。 NwvC[4
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分页支持类: xm~`7~nFR
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java代码: \?-<4Bc@
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package com.javaeye.common.util; gZXi]m&
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import java.util.List; l|[N42+
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publicclass PaginationSupport { v!-pSa)3
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publicfinalstaticint PAGESIZE = 30; ^uc=f2=>,
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privateint pageSize = PAGESIZE; iWkWR"ysy
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privateList items; adcE'fA<_
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privateint totalCount; n( yn<
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privateint[] indexes = newint[0]; CK@@HSm}l
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privateint startIndex = 0; V f&zL
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public PaginationSupport(List items, int O0v}43J[
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totalCount){
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setPageSize(PAGESIZE); qe#tj/aZ
setTotalCount(totalCount); 0[(8
setItems(items); ? OM!+O
setStartIndex(0); 1CZgb
} <'oQ \eB
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public PaginationSupport(List items, int (ZZ8L-s
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totalCount, int startIndex){ q3!bky\
setPageSize(PAGESIZE); lUZ+YD4
setTotalCount(totalCount); .`eN8Dl1
setItems(items); !e<^?
r4
setStartIndex(startIndex); kDioD
} bAqA1y3=
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public PaginationSupport(List items, int 2%m BK
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totalCount, int pageSize, int startIndex){ </zEg3F\
setPageSize(pageSize); C,r;VyW6BI
setTotalCount(totalCount); *i%d,w0+
setItems(items); U8?mc
setStartIndex(startIndex); d7upz]K9g
} [z{1*Xc
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publicList getItems(){ =dKtV.L
return items; :5<UkN)R(
} #;yZ
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publicvoid setItems(List items){ 6bC3O4Rw
this.items = items; x 9fip-
} P=
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publicint getPageSize(){ O^
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return pageSize; I\ob7X'Xu!
} lymCH
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publicvoid setPageSize(int pageSize){ ^09,"<@k
this.pageSize = pageSize; >y3=|
} U5de@Y
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publicint getTotalCount(){ #\m<Sz5Gp#
return totalCount; onzxx4bax
} ON(kt3.h
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publicvoid setTotalCount(int totalCount){ F JyT+
if(totalCount > 0){ m{HS0l'
this.totalCount = totalCount; UCj ld
int count = totalCount / n:!_
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pageSize; e\L8oOk#r
if(totalCount % pageSize > 0) YOO+R{4(
count++; ?e 4/p
indexes = newint[count]; }|=|s f
for(int i = 0; i < count; i++){ rx|pOz,:
indexes = pageSize * 4V`G,W4^J
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i; 'H;*W |:-]
} j#ab_3xH
}else{ Avb\{)s+
this.totalCount = 0; '`Hr}
}
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} <LiPEo.R
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publicint[] getIndexes(){ f@!.mDm]
return indexes; i/Zd8+.n$
} -iZ`Y?
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publicvoid setIndexes(int[] indexes){ Q$"D]!G
this.indexes = indexes; FYQS)s
} ;2QP7PrSY
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publicint getStartIndex(){ tCt#%7J;a
return startIndex; +ZP7{%
} Nh44]*
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publicvoid setStartIndex(int startIndex){ sYA1\YIii
if(totalCount <= 0) BI@[\aRLQ
this.startIndex = 0; $I?"lky
elseif(startIndex >= totalCount) >A"(KSNL
this.startIndex = indexes /)O"l @ }U
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[indexes.length - 1]; Mi_$">1-W
elseif(startIndex < 0) )^hbsMhO
this.startIndex = 0; ?S=mybp
else{ (TM,V!G+U~
this.startIndex = indexes C0Z=~Q%
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[startIndex / pageSize]; _+MJ%'>S
}
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} mt.))#1
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publicint getNextIndex(){ T)_hpt.
int nextIndex = getStartIndex() + >H,*H;6
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pageSize; 9Mcae31
if(nextIndex >= totalCount) _yR^*}xJb
return getStartIndex(); K3uRs{l|
else u*9V&>o
return nextIndex; a 1*p*dM#
} ,a?
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publicint getPreviousIndex(){ 47/iF97
int previousIndex = getStartIndex() - tZo} ;|~'
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pageSize; zm;C\s rF
if(previousIndex < 0) GC'O[q+
return0; 2X&qE}%k S
else [2cD:JL
return previousIndex; _@/8gPT*i
} j] [,J49L
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} c&Q$L }
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抽象业务类 TD_Oo-+\
java代码: *Pg2c(Vg
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/** PPsE${!
* Created on 2005-7-12 \l3h0R
*/ =Fl^`*n
package com.javaeye.common.business; T51
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import java.io.Serializable; _SkLYL!=9
import java.util.List; akQ7K
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import org.hibernate.Criteria; [Vt\$
import org.hibernate.HibernateException; 8dhUBJ0_
import org.hibernate.Session; =vhm}
import org.hibernate.criterion.DetachedCriteria; <a+Z;>
import org.hibernate.criterion.Projections; QmIBaMI#
import Z?z.?ar
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org.springframework.orm.hibernate3.HibernateCallback; 9cm#56
import {(}By/_
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org.springframework.orm.hibernate3.support.HibernateDaoS yV(\R
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upport; nQS|Lt_+
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import com.javaeye.common.util.PaginationSupport; ct}9i"H#1
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public abstract class AbstractManager extends A5w6]: f2
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HibernateDaoSupport { bN@
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privateboolean cacheQueries = false; u<&m]]*
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privateString queryCacheRegion; t
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publicvoid setCacheQueries(boolean ;A!BVq
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cacheQueries){ Q NVa?'0"Y
this.cacheQueries = cacheQueries; 8dyg1F
} wlmRe`R
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publicvoid setQueryCacheRegion(String 0SPk|kr
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queryCacheRegion){ */DO ex"y
this.queryCacheRegion = {1
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queryCacheRegion; Wo,?+I
} 29q _BR *:
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publicvoid save(finalObject entity){ ^G-@06 /!
getHibernateTemplate().save(entity); dC4'{n|7
} 4xJQ!>6
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publicvoid persist(finalObject entity){ @xZR9Z8]L
getHibernateTemplate().save(entity); RCLeA=/N@0
} ~^b/(
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publicvoid update(finalObject entity){ \5cpFj5%
getHibernateTemplate().update(entity); }4S6Xe
} ;6hOx(>`=
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publicvoid delete(finalObject entity){ 2dgd~
getHibernateTemplate().delete(entity); !5?<% *
} *_g$MI
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publicObject load(finalClass entity, dnuu&Rv
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finalSerializable id){ NW)1#]gg%
return getHibernateTemplate().load H7+,*
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(entity, id); Jpo(Wl
} D7qOZlX16
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publicObject get(finalClass entity, :P=(k2
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finalSerializable id){ IdxzE_@
return getHibernateTemplate().get W'TaBuCb
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(entity, id); ]"1DGg \A
} 9JKEw
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publicList findAll(finalClass entity){ 7})[lL`\s
return getHibernateTemplate().find("from cPc</[x[W
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" + entity.getName()); {2"zVt#h
} ~.lPEA %%
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publicList findByNamedQuery(finalString Q.c\/&
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namedQuery){ w.-!UD9/.x
return getHibernateTemplate *G9V'9
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().findByNamedQuery(namedQuery); 9k[9P;"F:
} 8qu6.
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publicList findByNamedQuery(finalString query, %GIr&V4|
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finalObject parameter){ "Os_vlapHo
return getHibernateTemplate ps DetP
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().findByNamedQuery(query, parameter); S?BG_J6A7
} 4|#WFLo@
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publicList findByNamedQuery(finalString query, {P#|zp 4C{
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finalObject[] parameters){ CQDkFQq-dq
return getHibernateTemplate -1ub^feJ,
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().findByNamedQuery(query, parameters); 6/dI6C!
} Tkgs]q79
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publicList find(finalString query){ 42ivT_H
return getHibernateTemplate().find )TM4R)r%)9
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(query); 8Kk(8a&v
} DrK{}uM
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publicList find(finalString query, finalObject I ?.^ho
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parameter){ -!]ZMi9
return getHibernateTemplate().find ?p8_AL'RS
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(query, parameter); V,N%;iB}
} t}tEvh
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public PaginationSupport findPageByCriteria ~gRf:VXX=_
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(final DetachedCriteria detachedCriteria){ h;NYdX5
return findPageByCriteria @bP)406p
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); vd4ytC
} PXNh&N
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public PaginationSupport findPageByCriteria (7=9++uU
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(final DetachedCriteria detachedCriteria, finalint As<bL:>dE
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startIndex){ 1|-Dj|
return findPageByCriteria 8E]F$.6U
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(detachedCriteria, PaginationSupport.PAGESIZE, 3I-MdApT
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startIndex); 0v$~90)
} K0Fh%Y4)QH
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public PaginationSupport findPageByCriteria ~zNAbaC+>t
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(final DetachedCriteria detachedCriteria, finalint y7Df_|Z
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pageSize, e'D&8z_;
finalint startIndex){ I"7u2"@-8j
return(PaginationSupport) O/(xj2~$J
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getHibernateTemplate().execute(new HibernateCallback(){ GYUn6P
publicObject doInHibernate p,i[W.dy.'
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(Session session)throws HibernateException { d)f :)Ew
Criteria criteria = [RTs[3E^
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detachedCriteria.getExecutableCriteria(session); Aj+F
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int totalCount = 3"KCh\\b
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((Integer) criteria.setProjection(Projections.rowCount gQ1;],_
t" Z6[XG
()).uniqueResult()).intValue(); :${HQd+
criteria.setProjection zu|\fP
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(null); X1vd'>
List items = M{hg0/}sUW
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criteria.setFirstResult(startIndex).setMaxResults 54li^
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(pageSize).list(); cY. bO/&l
PaginationSupport ps = ><HE;cVg?
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new PaginationSupport(items, totalCount, pageSize, K1!j fp
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startIndex); ur7q [n
return ps; ut/=R !(K
} =D#bb<o
}, true); :$BCRQ
} um>6z_"
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public List findAllByCriteria(final !9P';p}2
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DetachedCriteria detachedCriteria){ 7CTFOAx#
return(List) getHibernateTemplate |3yL&"
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().execute(new HibernateCallback(){ SPmq4
publicObject doInHibernate eb"5-0
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(Session session)throws HibernateException { ptxbDzOz
Criteria criteria = JKGe"
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detachedCriteria.getExecutableCriteria(session); GKc`xIQ
return criteria.list(); Qtv&ijFC
} i5?q,_
}, true); h
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} I->Ss},U
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public int getCountByCriteria(final 5 -RsnF
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DetachedCriteria detachedCriteria){ RMWHN:9
Integer count = (Integer) =`s!;
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getHibernateTemplate().execute(new HibernateCallback(){ /9pwZ%:<
publicObject doInHibernate !fR3(=oN
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(Session session)throws HibernateException { vbe|hO""
Criteria criteria = 6?~"V
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detachedCriteria.getExecutableCriteria(session); :~N-.#
return ly_HWuFJ3
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criteria.setProjection(Projections.rowCount K\6u9BYG
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()).uniqueResult(); s %\-E9
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} v"XGC i91L
}, true); Ayw ;N
return count.intValue(); fbKkq.w
} KP5C}ZK+s
} ?8Z0Gqt74
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用户在web层构造查询条件detachedCriteria,和可选的 fd<:_f]v
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 EZ$>.iy{
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PaginationSupport的实例ps。 #S*/bao#
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ps.getItems()得到已分页好的结果集 !()$8
ps.getIndexes()得到分页索引的数组 wL
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ps.getTotalCount()得到总结果数 0C
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ps.getStartIndex()当前分页索引 6vNrBB
ps.getNextIndex()下一页索引 bITPQ7+
ps.getPreviousIndex()上一页索引 KZ
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 c[4i9I3v
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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 <vh/4
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一下代码重构了。 6qoyiT%P&
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我把原本我的做法也提供出来供大家讨论吧: dDGgvi|[Mz
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首先,为了实现分页查询,我封装了一个Page类: ^O<&f D
java代码: J|kR5'?x
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/*Created on 2005-4-14*/ Yu[ t\/
package org.flyware.util.page; f~y%%+{p
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/** n}_JB>i~
* @author Joa ?Exv|e
* V#t%/l
*/ qx8fRIK%
publicclass Page { o+QE8H43
f]|ysf
/** imply if the page has previous page */ YY)s p%
privateboolean hasPrePage; S=<}:#;u0
1#*a:F&re
/** imply if the page has next page */ M/ni6%x
privateboolean hasNextPage; Jz.NHiLct1
TYmP)
/** the number of every page */ %Yicg6:
privateint everyPage; CBOi`bEf
L,`Lggq-
/** the total page number */ ;8*`{F[
privateint totalPage; q<[_T
6@e+C;j=
/** the number of current page */ 8U>B~9:JO
privateint currentPage; L[H5NUG!
KJ=6 n%6
/** the begin index of the records by the current ^xHTW g%9
D@|W<i-
query */ jR22t`4
privateint beginIndex; ^ZhG>L*
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') gi%
/** The default constructor */ o/6-3QUak
public Page(){ V\6[}J
^G.Xc\^w:
} QM
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/** construct the page by everyPage rI>aAW'
* @param everyPage 8lb%eb]U
* */ ~Ro9up
public Page(int everyPage){ v<OJ69J
this.everyPage = everyPage; ,M6Sy]Aj
} #qI= Z0Y
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/** The whole constructor */ e7(ucE
public Page(boolean hasPrePage, boolean hasNextPage, Vf'd*-_!Q<
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int everyPage, int totalPage, ,:`4%
int currentPage, int beginIndex){ ]Nl=wZ#`
this.hasPrePage = hasPrePage; 2viM)+
this.hasNextPage = hasNextPage; mc_ch$r!
this.everyPage = everyPage; 9@52Fg;mj
this.totalPage = totalPage; x2z;6)
this.currentPage = currentPage; W$rH"_@m
this.beginIndex = beginIndex; < hO
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} T/xp?Vq6/
K]|> Et`
/** &)vC;$vD`
* @return T ;vF(
* Returns the beginIndex. GXjfQ~<]
*/ C;`XlQG `
publicint getBeginIndex(){ {R61cD,n
return beginIndex; ?jt}*q>X]
} &A)B~"[~
A~+S1
/** s]mY*@a%
* @param beginIndex Yd= a}T
* The beginIndex to set. 9^Whg~{
*/ >teOm?@U
publicvoid setBeginIndex(int beginIndex){ \ZhfgE8{%
this.beginIndex = beginIndex; ~r$jza~o(
} ]Xf% ,iu
@`Eg(
/** XC "'Q+
* @return gV`=jAE_
* Returns the currentPage. [],1lRYI9_
*/ 13%t"-@bh
publicint getCurrentPage(){ ^;maotHn
return currentPage; J.dLPKU;-
} t|!j2<e
z=_Ef3`M
/** \,&co
* @param currentPage Nl9I*x^e
* The currentPage to set. f0<%&2ym
*/ ]oV{t<0a
publicvoid setCurrentPage(int currentPage){ QgD g}\P
this.currentPage = currentPage; P=+nB*hG
} )aao[_ZS
VX+jadYdq
/** ?wF'<kEH
* @return |),'9
* Returns the everyPage. +sx 8t
*/ J}@z_^|"mJ
publicint getEveryPage(){ VY"9?2?/
return everyPage; Ra/Ukv_ v
} 7 aYn0_NKp
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/** C?= P
* @param everyPage _s$_Sa ;
* The everyPage to set. hf<^/@^tK
*/ .tmiQ.
publicvoid setEveryPage(int everyPage){ N!x =eC
this.everyPage = everyPage; 6uKMCQ=h
} e9Pk"HHl
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/** UMp/\&0
* @return A@D2+fS
* Returns the hasNextPage. 3
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*/ ym/fFm6h
publicboolean getHasNextPage(){ Q33"u/-v
return hasNextPage; %#Z/2<_
} lR`'e0Lq
qdG~!h7j
/** h:)Ci!D;
* @param hasNextPage [kzd(u
* The hasNextPage to set.
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*/ ;v~-'*0
publicvoid setHasNextPage(boolean hasNextPage){ (NK9vW4F
this.hasNextPage = hasNextPage; t"lyvI[
} 9lj!C'
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/** s/e"'Hz
* @return @@g\2Gs
* Returns the hasPrePage. y"<))-MH
*/ 8?O>ZZtu
publicboolean getHasPrePage(){ P;8>5;U4-
return hasPrePage; Enq|Y$qm
} T<joRR
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/** =!UR=Hq
* @param hasPrePage deeU@x`f<
* The hasPrePage to set. nL}5cPI
*/ <0.$'M~E
publicvoid setHasPrePage(boolean hasPrePage){ C*te^3k>B
this.hasPrePage = hasPrePage; Lru-u:
} BH@)QVs-
qr50E[
/** X$b={]b
* @return Returns the totalPage. OR Wm
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* &G >(9
*/ [;oCYb$9
publicint getTotalPage(){ H{c?lT
return totalPage; Tv]<SI<B[
} LaIJ1jf
3q:{1rc
/** o{kbc5_
* @param totalPage 5Wj;
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)
* The totalPage to set. Xvok1NM,
*/ \#x}q'BC4
publicvoid setTotalPage(int totalPage){ V*$L;xbC|
this.totalPage = totalPage; !b-bP,q
} Na,_
`C+HE$B
} ixh47M
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Hv<'dt$|
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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 s&{Qdf
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个PageUtil,负责对Page对象进行构造: q 'a
java代码: "?GebA
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/*Created on 2005-4-14*/ Bl1Z4` 3
package org.flyware.util.page; rn:!dV[
|"$uRV=qm
import org.apache.commons.logging.Log; 0-3rQ~u
import org.apache.commons.logging.LogFactory; )W&>[B
Qc{RaMwD
/** +f;CyMEp
* @author Joa :y,v&Kk#T
* 8Chu"PM%-J
*/ Ei@M$Fd
publicclass PageUtil { hvt@XZT
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privatestaticfinal Log logger = LogFactory.getLog dYojm1MQ
;}.Kb
(PageUtil.class); {sv{847V
l t]B#, '
/** F X1ZG!
* Use the origin page to create a new page f|a DTWF
* @param page VzRx%j/i
* @param totalRecords ]yX@'f
* @return D;F{1[s(
*/ fd8#Ng"1
publicstatic Page createPage(Page page, int %xyX8c{sP
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totalRecords){ c;I, O
return createPage(page.getEveryPage(), +MO E
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page.getCurrentPage(), totalRecords); 88a<{5
:z
} e}cnX`B
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/** s3lwu :4f
* the basic page utils not including exception @#b0T:+v'
=ziy`#fm,
handler *R`MMm
* @param everyPage PG)_L.7rJ
* @param currentPage K2/E#}/
* @param totalRecords f!-Sz/ c#
* @return page 'CS.p!Z\
*/ NyI;v=
publicstatic Page createPage(int everyPage, int c! H 9yk
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currentPage, int totalRecords){ m<3v)R[>
everyPage = getEveryPage(everyPage); /k7wwZiY@
currentPage = getCurrentPage(currentPage); 5y_"
int beginIndex = getBeginIndex(everyPage, 2N6=8Xy5K
/'>;JF
currentPage); .)8
int totalPage = getTotalPage(everyPage, l@d
gJ
X#+`e+Df
totalRecords); ? Ekq6uz\)
boolean hasNextPage = hasNextPage(currentPage, H^CilwD158
{B yn{?w
totalPage); ~' =lou
boolean hasPrePage = hasPrePage(currentPage); voRfjsS~
<qiICb)~
returnnew Page(hasPrePage, hasNextPage, jgvh[@uB?
everyPage, totalPage, :?r*p>0$
currentPage, (@ea|Fd#4
g^o_\hp
beginIndex); gf$HuCh|
} -%uy63LbHF
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privatestaticint getEveryPage(int everyPage){ qZG-Lh
return everyPage == 0 ? 10 : everyPage; 4&}\BU*
} dB|Te "6
a0zG(7.D
privatestaticint getCurrentPage(int currentPage){ NR/-m7#-
return currentPage == 0 ? 1 : currentPage; | Odu4 Q
} .Y/-8H-3v
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privatestaticint getBeginIndex(int everyPage, int T~Y g5J
Cals?u#U=
currentPage){ B {i&~k
return(currentPage - 1) * everyPage; 8SD}nFQ
} =O^7TrM
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privatestaticint getTotalPage(int everyPage, int eECj_eH-
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totalRecords){ C/+nSe.
int totalPage = 0; 7L{li-crI
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if(totalRecords % everyPage == 0) \3 KfD'L
totalPage = totalRecords / everyPage; 2v|qLfe1
else rZ866\0
totalPage = totalRecords / everyPage + 1 ; Kpu<rKP`
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return totalPage; (/q}mB
} t+}uIp42<
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privatestaticboolean hasPrePage(int currentPage){ [>uwk``_
return currentPage == 1 ? false : true; 5~yb
~0
} Fi{mr*}
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privatestaticboolean hasNextPage(int currentPage, anZIB
Z)v)\l9d
int totalPage){ 0P:F97"1,
return currentPage == totalPage || totalPage == 'j /q76uXV
9XN~Ln@}
0 ? false : true; 2<.Vv\
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} 2?*1~ 5~I
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} I;iR(Hf)?q
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 s#Q_Gu
LsotgQ8
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 >\-3P$
bG1 ofsU
做法如下: d:$G|<