Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 y\k#83aU|
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 )B)ecJJ_
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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 juIi-*R!
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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 hh#p=Y(f
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分页支持类: $raq,SP
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java代码: S\io5|P
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package com.javaeye.common.util; A*^aBWFR
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import java.util.List; ^pwT8Bp
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publicclass PaginationSupport { ur\<NApT;
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publicfinalstaticint PAGESIZE = 30; 6--t6>5
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privateint pageSize = PAGESIZE; +adwEYRrr
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privateList items; 4M*Z1
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privateint totalCount; .7BJq?K.
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privateint[] indexes = newint[0]; uo`zAKM&A
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privateint startIndex = 0; i/|}#yw8A
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public PaginationSupport(List items, int n,D&pl9f
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totalCount){ y7^E`LKK
setPageSize(PAGESIZE); {f"oqry_g
setTotalCount(totalCount); ~)CGwST[
setItems(items); qf
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setStartIndex(0); 7w\L<vFm
} };Pdn7;1G:
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public PaginationSupport(List items, int {'cm;V+
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totalCount, int startIndex){ cS#yfN,
setPageSize(PAGESIZE); T{:8,CiW
setTotalCount(totalCount); `:.a5
setItems(items); t#d{hEr
setStartIndex(startIndex); *[Im].
} rHiBW!
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public PaginationSupport(List items, int *47HN7
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totalCount, int pageSize, int startIndex){ Q@ua
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setPageSize(pageSize); >npTUOGL=n
setTotalCount(totalCount); (1e,9!?
setItems(items); O!se-h5mW8
setStartIndex(startIndex); nD.K*# u
} CT?4A1[aD
= IJ}b=:
publicList getItems(){ /Bq4! n+
return items; w"{mDL}c
} AZ>F+@ d
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publicvoid setItems(List items){ \AeM=K6q+D
this.items = items; NK\0X5##.
} i&^]qL|J
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publicint getPageSize(){ ?U+nR/H:6
return pageSize; Fe1XczB
} !?)aZ |r
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publicvoid setPageSize(int pageSize){ qh|fq
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this.pageSize = pageSize; `ztp u
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} m<sCRWa-
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publicint getTotalCount(){ i&KBMx
return totalCount; ;;S9kNp^v
} }Qa
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publicvoid setTotalCount(int totalCount){ KwNOB _
if(totalCount > 0){ +2+|zXmT
this.totalCount = totalCount; ' ""s%C+
int count = totalCount / {8 #
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pageSize; _MWW
if(totalCount % pageSize > 0) V%'' GF
count++; L 8J] X7
indexes = newint[count]; Ax6zx
for(int i = 0; i < count; i++){ ;#L]7ZY9:-
indexes = pageSize * .Zc:$"gDu
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} 40aD\S>
}else{ 5,|of{8
this.totalCount = 0; tIk$4)ZAl
} JFdMYb
} 'w0?-
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publicint[] getIndexes(){ 97dF
return indexes; =)}Yw)
} j-d542"
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publicvoid setIndexes(int[] indexes){ z))rk vL%
this.indexes = indexes; N)/7j7c~;
} c*r@QmB:
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publicint getStartIndex(){ F. I\?b
return startIndex; EMPujik-
} FqZD'Uu7
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publicvoid setStartIndex(int startIndex){ BoXPX2:
if(totalCount <= 0) =zR9^k
this.startIndex = 0; Yyw9IYB;
elseif(startIndex >= totalCount) _hgGF9
this.startIndex = indexes ydMhb367|
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[indexes.length - 1]; \*M;W|8aB
elseif(startIndex < 0) ^fV-m&F)K*
this.startIndex = 0; \E6 0
else{ `_sKR,LhB
this.startIndex = indexes XqGa]/;}
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[startIndex / pageSize]; #r,!-;^'p
} cd`P'GDF
} r`$P60,@C
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publicint getNextIndex(){ MO?
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int nextIndex = getStartIndex() + _q4Yq'dI
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pageSize; k(xB%>ns
if(nextIndex >= totalCount) %XQJ!sC`
return getStartIndex(); ZFtJoGaR
else vXZ
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return nextIndex; \O]kf>nC
} %jJIR88
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publicint getPreviousIndex(){ QRx9;!~b}
int previousIndex = getStartIndex() - 3vkzN
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pageSize;
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if(previousIndex < 0) mKoDy`s
return0; i*8j|
else l3+G ]C&<
return previousIndex; K+d{R=s^
} (:^YfG~e
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} (Q.tH
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抽象业务类 (1[Z#y[
java代码: lR/Uboyy
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/** 0>"y)T3
* Created on 2005-7-12 11Uu5e!.
*/ aWNjl
package com.javaeye.common.business; S~W;Ld<>fB
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import java.io.Serializable; Q[FDk63;w
import java.util.List; I+`>e*:@W
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import org.hibernate.Criteria; {suQ"iv
import org.hibernate.HibernateException; )NTpb
import org.hibernate.Session; XjmAM/H4
import org.hibernate.criterion.DetachedCriteria; Nrq/Pkmy
import org.hibernate.criterion.Projections; A"0Yn(awWu
import VF +g+~
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org.springframework.orm.hibernate3.HibernateCallback; NZlCn:"
import
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org.springframework.orm.hibernate3.support.HibernateDaoS n<F3&2w
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upport; f%JM
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import com.javaeye.common.util.PaginationSupport; xTqP`ljX
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public abstract class AbstractManager extends cEn|Q
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HibernateDaoSupport { flz7{W
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privateboolean cacheQueries = false; ~jzT;9:
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privateString queryCacheRegion; FbH@qHSH
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publicvoid setCacheQueries(boolean Q(R-8"
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cacheQueries){ m|;gl|dTB
this.cacheQueries = cacheQueries; m8eoD{
} ;iQw2XhT
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publicvoid setQueryCacheRegion(String /XNC^!z6Js
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queryCacheRegion){ >>M7#hmt
this.queryCacheRegion = ,s6lB0
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queryCacheRegion; 69t6lB#;!
} \^!<Y\\
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publicvoid save(finalObject entity){ uZ+"-Ig
getHibernateTemplate().save(entity); jaIcIc=Pf
} aCi)icn$
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publicvoid persist(finalObject entity){ Y1F%-o
getHibernateTemplate().save(entity); XsSDz}dg
}
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publicvoid update(finalObject entity){ Q=Q&\.<
getHibernateTemplate().update(entity); -Vs;4-B{9
} =>&~p\Aw
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publicvoid delete(finalObject entity){ A+}O~,mxP8
getHibernateTemplate().delete(entity); |x=(}g
} ,#9i=gp
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publicObject load(finalClass entity, IR&b2FTcU
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finalSerializable id){ L+mHeS l
return getHibernateTemplate().load k4!p))ql
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(entity, id); '5A&c(
} _bv9/# tR
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publicObject get(finalClass entity, KI].T+I
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finalSerializable id){ +:/.\3v71
return getHibernateTemplate().get Zeq^dV5y77
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(entity, id); ^* CKx
} p
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publicList findAll(finalClass entity){ kX*.BZI}C
return getHibernateTemplate().find("from !<F5W<V
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" + entity.getName()); e:.D^GFi
} ];eJ'#
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publicList findByNamedQuery(finalString kt7Em b}
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namedQuery){ Cd_H<8__
return getHibernateTemplate %fXgV\xY
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().findByNamedQuery(namedQuery); R <&U]%FD
} 0Ca/[_
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publicList findByNamedQuery(finalString query, [Kb)Q{=)
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finalObject parameter){ d6zq,x!cI
return getHibernateTemplate %][zn$aa|
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().findByNamedQuery(query, parameter); x4`|[
} 6I|9@~!y[
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publicList findByNamedQuery(finalString query, d_&~^*>
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finalObject[] parameters){ M=1~BZQ(Z
return getHibernateTemplate )/z+W[t
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().findByNamedQuery(query, parameters); :>jzL8
} ;0Ih:YY6
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publicList find(finalString query){ 6kONuG7Yv
return getHibernateTemplate().find Z5*O\kJv
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(query); Bi0&F1ZC!
} vCtnjWGX}/
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publicList find(finalString query, finalObject Ng*O/g`%L
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parameter){ >QBDxm
return getHibernateTemplate().find iE]^6i
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(query, parameter); :Yi 4Ia
} "msPH<D
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public PaginationSupport findPageByCriteria N`vPt?@
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(final DetachedCriteria detachedCriteria){ !3"Hn
return findPageByCriteria dAaxbP|
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 2W/*1K}
} l5U ^lc
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public PaginationSupport findPageByCriteria qIO)<5\[%d
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(final DetachedCriteria detachedCriteria, finalint 99[v/L>F
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startIndex){ =[)2DJC
return findPageByCriteria <}%gZ:Z6g
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(detachedCriteria, PaginationSupport.PAGESIZE, kvt^s0T8Q
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startIndex); ~S0T+4$
} l i%8X.
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public PaginationSupport findPageByCriteria $
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(final DetachedCriteria detachedCriteria, finalint x`K"1E{2
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pageSize, :ZXaJ!
finalint startIndex){ 7[M@;$
return(PaginationSupport) z~jk_|?|?
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}.e
getHibernateTemplate().execute(new HibernateCallback(){ ~b9fk)z!
publicObject doInHibernate .zJZ*\2ob
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(Session session)throws HibernateException { sw,p6T[
Criteria criteria = FuP~_ E~
= Fwzm^}6
detachedCriteria.getExecutableCriteria(session); ka:wD?>1i
int totalCount = n%{oFTLCo
Z}>+!Z
((Integer) criteria.setProjection(Projections.rowCount )2bbG4:N
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()).uniqueResult()).intValue(); wR9gx-bE
4
criteria.setProjection 0fa8.g#I$
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(null); *C(q{|f
List items = N&W7g#F
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criteria.setFirstResult(startIndex).setMaxResults o H]FT{
.j`8E^7<
(pageSize).list(); sP%J`L@h
PaginationSupport ps = ^C{?LH/2
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new PaginationSupport(items, totalCount, pageSize, 6/|"y
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startIndex); ,u
return ps; >yr3C
} ZRC7j?ui8`
}, true); 4Gsq)i17j
} buxyZV@1
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public List findAllByCriteria(final }ct*<zj[~u
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DetachedCriteria detachedCriteria){ S@C"tHD
return(List) getHibernateTemplate dg;E,'e_
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().execute(new HibernateCallback(){ X+//$J
publicObject doInHibernate ^ANz=`N5,
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(Session session)throws HibernateException { .Mzrj{^Y
Criteria criteria = `u7twW*U2
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detachedCriteria.getExecutableCriteria(session); #s-li b
return criteria.list(); ''CowI
} lDG.\u
}, true); Y=
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} =
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public int getCountByCriteria(final CfHPJ:Qo[
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DetachedCriteria detachedCriteria){ [.4D<}e
Integer count = (Integer) V(n3W=#kky
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getHibernateTemplate().execute(new HibernateCallback(){ l78:.
publicObject doInHibernate ZHc;8|}
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(Session session)throws HibernateException { 9S)A6]
Criteria criteria = 5$
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detachedCriteria.getExecutableCriteria(session); ZRCUM"R_
return %l)~C%T
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criteria.setProjection(Projections.rowCount Q37zBC0
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()).uniqueResult(); Z/I`XPmk
} R]_fe4Y0
}, true); bqUQadDB
return count.intValue(); 0"=}d y
} x`p3I*_HT5
} :n(!,
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用户在web层构造查询条件detachedCriteria,和可选的 ~8G cWy6
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Uc|MfxsL
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PaginationSupport的实例ps。 +@K8:}lOW
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ps.getItems()得到已分页好的结果集 v:@ud,d<
ps.getIndexes()得到分页索引的数组 gPWl# 5P:
ps.getTotalCount()得到总结果数 Vq#_/23=$y
ps.getStartIndex()当前分页索引 {X>U`0P
ps.getNextIndex()下一页索引 \(xQ'AQ-
ps.getPreviousIndex()上一页索引 v7-
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 cOEzS
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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 }sS1p6z
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一下代码重构了。 GE.@*W
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我把原本我的做法也提供出来供大家讨论吧: Voc&T+A m
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首先,为了实现分页查询,我封装了一个Page类: -qRO}EF
java代码: +)K yG
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/*Created on 2005-4-14*/ BXo9s~5Q
package org.flyware.util.page; p h=[|P)
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/** hk1jxnQh
* @author Joa Mt`XHXTp
* #n}n
%
*/ quw:4W>
publicclass Page { Li\BRlebR{
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/** imply if the page has previous page */ MOW {g\{\
privateboolean hasPrePage; B 9AE*
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/** imply if the page has next page */ :7Q,
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privateboolean hasNextPage; |qsY0zx
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/** the number of every page */ ?YbZVoD)J
privateint everyPage; *npe]cC
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/** the total page number */ -d6*M*{|
privateint totalPage; &g<`i{_
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/** the number of current page */ XS/5y(W
privateint currentPage; wY j~ (P"
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/** the begin index of the records by the current :WBl0`kW]4
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query */ g8_IZ(%:
privateint beginIndex; &vp0zYd+v
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/** The default constructor */ vXM``|
public Page(){ 3M&75OE
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} 2=l!b/m
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/** construct the page by everyPage W=~H_L?/
* @param everyPage 8W_X&X?Q
* */
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public Page(int everyPage){ QYL
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this.everyPage = everyPage; {XNu4d9w(
}
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/** The whole constructor */ 4n@,
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public Page(boolean hasPrePage, boolean hasNextPage, ZWJFd(6
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int everyPage, int totalPage, f V.(v&
int currentPage, int beginIndex){ wFaWLC|&
this.hasPrePage = hasPrePage; O({-lI
this.hasNextPage = hasNextPage; :Y [r^=>
this.everyPage = everyPage; Yg#)@L
this.totalPage = totalPage; s"?&`S
this.currentPage = currentPage; xf@D<}~1
this.beginIndex = beginIndex; IczEddt@'
} ?D6rFUs9;
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/** _dEf@==
* @return r(yb%p+
* Returns the beginIndex. 2aN
*/ S-h1p`
publicint getBeginIndex(){ ud-.R~f{e
return beginIndex; 1q!6Sny@
} {hM*h(W~3
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/** }r/L 9
* @param beginIndex T8FKa4ikn
* The beginIndex to set. 2'J.$ h3
*/ -K/' }I
publicvoid setBeginIndex(int beginIndex){ 6P;1I+5m{q
this.beginIndex = beginIndex; d}',Bl+u{$
} /=\__$l)
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/** 8L 9;VY^Y
* @return .{-8gAh
* Returns the currentPage. UgJ^NF2w
*/ 1p&?MxLN-a
publicint getCurrentPage(){ 6#5@d^a
return currentPage; \o@b5z]e
} 9ffRY,1@
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/** ^\mN<z(
* @param currentPage >|7&hj$
* The currentPage to set. zT~ GBC-IX
*/ 1)NX;CN
publicvoid setCurrentPage(int currentPage){ Pwz^{*u]
this.currentPage = currentPage; VPg`vI$(X
} *(d^k;
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/** j>R7OGg'
* @return -ij1%#t z
* Returns the everyPage. J\
*/ xMhR;lKY
publicint getEveryPage(){ YKl!M/
return everyPage; ,^o^@SI)
} mXF
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/** N
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* @param everyPage Ze Shn
* The everyPage to set. foE2rV/Y
*/ :ykZ7X&
publicvoid setEveryPage(int everyPage){ i`8!Vm
this.everyPage = everyPage; :eQxdi'
} /IV:JVT
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/** {Rw~G&vQ
* @return 8gBqur{
* Returns the hasNextPage. _I|wp<R
*/ S_2I8G^A
publicboolean getHasNextPage(){ e@^}y4
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return hasNextPage; uNhAfZ
} ZVIBmx
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/** OR"n i
* @param hasNextPage +bf%]
* The hasNextPage to set. |klL KX&
*/ pdnL~sv
publicvoid setHasNextPage(boolean hasNextPage){ rzaEVXbz1
this.hasNextPage = hasNextPage; web&M!-
} bJB:]vs$
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/** 9f l !CG
* @return {Y'_QW1:2
* Returns the hasPrePage. YN>#zr+~
*/ ?QVD)JI*k
publicboolean getHasPrePage(){ e$>5GM
return hasPrePage; F/EHU?_EI
} [S</QS!
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/** ,}FYY66K
* @param hasPrePage 4?yc/F=kI
* The hasPrePage to set. ={L:q8v)
*/ ,CM$A}7[
publicvoid setHasPrePage(boolean hasPrePage){ Tu/JhP/g,`
this.hasPrePage = hasPrePage; l3iL.?&Pa
} "F[VqqD
l1W5pmhK]'
/** m_Fw;s/9
* @return Returns the totalPage. dEe/\i'r9
* eIqj7UY_
*/ bNaJ{Dm$R
publicint getTotalPage(){ 4a2&kIn
return totalPage; KP<J~+_ik
} 5E!|-xD
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/** /
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* @param totalPage
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* The totalPage to set. Fsq S)
*/ IG9Q~7@
publicvoid setTotalPage(int totalPage){ [?IERE!xQ
this.totalPage = totalPage; dNJK[1e6
} caj)
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} \GvVs
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 @$nI\n?*
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个PageUtil,负责对Page对象进行构造: v"F0$c
java代码: {YGz=5 ^
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/*Created on 2005-4-14*/ /d{L]*v)]
package org.flyware.util.page; +qz)KtJS
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import org.apache.commons.logging.Log; ~hxB Pn."
import org.apache.commons.logging.LogFactory; q]r!5&Z