Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ~W-5-Nl{s
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ]Rj?OSok
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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 f([d/
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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 )j. .)o
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分页支持类: sQn@:Gk
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java代码: }8'b}7!
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package com.javaeye.common.util; ZqXp f
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import java.util.List; cp6I]#X
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publicclass PaginationSupport { ._q<~_~R
*!ecb1U5
publicfinalstaticint PAGESIZE = 30; pA6A*~QE
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privateint pageSize = PAGESIZE; *Tr9pq%m
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privateList items; lN x7$z`
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privateint totalCount; g} pD%
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privateint[] indexes = newint[0]; 1u"#rC>7.4
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privateint startIndex = 0; Yr[&*>S
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public PaginationSupport(List items, int ""*g\
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totalCount){ ^bq,+1;@Q
setPageSize(PAGESIZE); dWdD^>8Ef
setTotalCount(totalCount); D@kf^1G
setItems(items); / }*}r
setStartIndex(0); d4p6.3
} 1iqgVby
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public PaginationSupport(List items, int @9R78Zra
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totalCount, int startIndex){ dsH*9t:z
setPageSize(PAGESIZE); Jt0U`_
setTotalCount(totalCount);
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setItems(items); }Rw6+;
setStartIndex(startIndex); J 5xMA-
} $Ggnn#
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public PaginationSupport(List items, int sPXjU5uq#
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totalCount, int pageSize, int startIndex){ cL][sI
setPageSize(pageSize); .h\Py[h<^
setTotalCount(totalCount);
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setItems(items); u:mndTpB6x
setStartIndex(startIndex); /nn~&OU
} Cy)N hgz
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publicList getItems(){ XMdCQ=
return items; { {:Fs
} kdp^{zW}
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publicvoid setItems(List items){ ~Z!YB,)bp
this.items = items; _,IjB/PR(
} pWq+`|l$
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publicint getPageSize(){ %M))Ak4~a
return pageSize; EB*C;ms
} n1PBpM9!
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publicvoid setPageSize(int pageSize){ jU* D
this.pageSize = pageSize; Y}:4y$<
} 5-y*]:g(
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publicint getTotalCount(){ P|Gwt&
return totalCount; <i]0EE}%
} R PoBF~>
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publicvoid setTotalCount(int totalCount){ GC' e
if(totalCount > 0){ %ek0NBE7
this.totalCount = totalCount; O ;[Mi
int count = totalCount / p$qk\efv*4
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pageSize; i q oXku
if(totalCount % pageSize > 0) )Jdku}Pf
count++; ~LZrhwVj$
indexes = newint[count]; 6>oc,=MV/
for(int i = 0; i < count; i++){ 0y+^{@lU
indexes = pageSize * y_w
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} #QIY+muN
}else{ "lLh#W1d
this.totalCount = 0; `lWGwFg g(
} 8'jt59/f
} /e|Lw4$@S
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publicint[] getIndexes(){ kfZ`|w@q
return indexes; ..X _nF
} )E*f30
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publicvoid setIndexes(int[] indexes){ !'p<Kh[i
this.indexes = indexes; l`ZL^uT
} 8.n#@%
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publicint getStartIndex(){ ,]7ouH$H}
return startIndex; vt2.
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} E+qLj|IU
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publicvoid setStartIndex(int startIndex){ &K[sb%
if(totalCount <= 0) n qO*z<
this.startIndex = 0; Ux*xz|^
elseif(startIndex >= totalCount) GEF's#YWK
this.startIndex = indexes q+9->D(6
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[indexes.length - 1]; zGR,}v%%
elseif(startIndex < 0) 5L[imO M0
this.startIndex = 0; 4KtD
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else{ DxNob-Fr
this.startIndex = indexes T` h%=u|D
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[startIndex / pageSize]; 4@3 \Ihv
} 5=I({=/>
} W+1nf:AI.
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publicint getNextIndex(){ h~\k;ca
int nextIndex = getStartIndex() + ?.Vuet
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pageSize; LYECX
if(nextIndex >= totalCount) rIPfO'T?
return getStartIndex(); j0}wv~\
else +_J@8k
return nextIndex; Awxm[:r>^
} ^UJIDg7zS
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publicint getPreviousIndex(){ JI]Lz1i
int previousIndex = getStartIndex() - lf>d{zd5
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pageSize; _Sfu8k>):
if(previousIndex < 0) S1Y,5,}
return0; Z,2?TT|p
else yKl^-%Uq<
return previousIndex; 3-hcKE
} Kt*fQ
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} xjbI1qCfe
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抽象业务类 onSt%5{P%X
java代码: DCiU?u~
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/** j[gqS%
* Created on 2005-7-12 XLpn3sX$
*/ }C_g;7*
package com.javaeye.common.business; Al*=%nY
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import java.io.Serializable; YU-wE';H6
import java.util.List; 4 N$Wpx
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import org.hibernate.Criteria; 4'#=_J
import org.hibernate.HibernateException; rhPv{6Z|7
import org.hibernate.Session; j:1N&7<FU
import org.hibernate.criterion.DetachedCriteria; )J @[8 x`
import org.hibernate.criterion.Projections; Z72%Bv
import u->[y1JY
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org.springframework.orm.hibernate3.HibernateCallback; TDR|*Cs
import n^;-&
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org.springframework.orm.hibernate3.support.HibernateDaoS q[qX O5
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upport; b*h:e.q
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import com.javaeye.common.util.PaginationSupport; yxu7YGp%
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public abstract class AbstractManager extends [jGE{<Je
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HibernateDaoSupport { xlh<}Vtp
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privateboolean cacheQueries = false; - rI4_Dl
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privateString queryCacheRegion; Q9Go}}n
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publicvoid setCacheQueries(boolean 2(P<TP._E
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cacheQueries){ g!z &lQnZ
this.cacheQueries = cacheQueries; E
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} Sw>,Q-32
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publicvoid setQueryCacheRegion(String $y UPua/-
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queryCacheRegion){ xS=" o
this.queryCacheRegion = &z>iqm"Ww
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queryCacheRegion; ~y/qm
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} \{qtdTd
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publicvoid save(finalObject entity){ R?Ch8mW.!
getHibernateTemplate().save(entity); 6zGeGW
} cs[nFfM
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publicvoid persist(finalObject entity){ 0%yPuY>
getHibernateTemplate().save(entity); oq,*@5xV2
} z+^9)wg9
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publicvoid update(finalObject entity){ Fu[GQ6{f
getHibernateTemplate().update(entity); /PG%Y]l0b
} n'1LNi
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publicvoid delete(finalObject entity){ JZE<oQ_Jm
getHibernateTemplate().delete(entity); ?`75ah
} biU
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publicObject load(finalClass entity, Dw,LB>Eq,
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finalSerializable id){ lQ4$d{m`
return getHibernateTemplate().load IiY%y:!g
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(entity, id); }}Gkipp
} XRP+0=0
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publicObject get(finalClass entity, {yMkd4v
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finalSerializable id){ =!/T4Oo
return getHibernateTemplate().get 7>EMr}f C
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(entity, id); ;)ERxMun
} 0QEcJ]Qb8
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publicList findAll(finalClass entity){ ciW;sK8
return getHibernateTemplate().find("from V3/OKI\o
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" + entity.getName()); ler$HA%F]
} @k/|%%uP
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publicList findByNamedQuery(finalString T`c:16I
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namedQuery){ 6HH:K0j3'
return getHibernateTemplate oMNBK/X_
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().findByNamedQuery(namedQuery); *~.'lE%[U
} Ki /j\
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publicList findByNamedQuery(finalString query, #.LI`nYA
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finalObject parameter){ M1*x47bN
return getHibernateTemplate tnq ZlS
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().findByNamedQuery(query, parameter); H8E#r*"-m
} yXf+dMv
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publicList findByNamedQuery(finalString query, )W1[{?
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finalObject[] parameters){ |WgFLF~k
return getHibernateTemplate $`L
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().findByNamedQuery(query, parameters); WqHp23
} qI[AsM+
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publicList find(finalString query){ CH6;jo]
return getHibernateTemplate().find Dt'bbX'edw
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(query); g2YE^EKU~
} Ru$%gh>v
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publicList find(finalString query, finalObject {3``B#}
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parameter){ :,.HJ[Vg&
return getHibernateTemplate().find H@sM$8
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(query, parameter); `KieN/d%
} oW6b3Q/B
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public PaginationSupport findPageByCriteria &pHXSU
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(final DetachedCriteria detachedCriteria){ K}p0$Lc
return findPageByCriteria i({MID)/_
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 9 6%N
} O:#/To'
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public PaginationSupport findPageByCriteria PVrNS7 Rk/
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(final DetachedCriteria detachedCriteria, finalint -`PLewvX
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startIndex){ tQ)l4Y 8
return findPageByCriteria ,v#3A7"yW
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(detachedCriteria, PaginationSupport.PAGESIZE, ;ao <{i?
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startIndex); g+-^6UG
} QM{B(zH
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public PaginationSupport findPageByCriteria H:mcex
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(final DetachedCriteria detachedCriteria, finalint fH%C&xj'&
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pageSize, z h%b<
finalint startIndex){ 8L*#zaSAf
return(PaginationSupport) ,t39~w
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getHibernateTemplate().execute(new HibernateCallback(){ :e\M~n+y
publicObject doInHibernate s 4n<k]d
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(Session session)throws HibernateException { a4",BDx
Criteria criteria = <SRo2rjRa
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detachedCriteria.getExecutableCriteria(session); @Suww@<
int totalCount = x6Q_+!mnk
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((Integer) criteria.setProjection(Projections.rowCount r(g2&}o\
^O**ZndB/
()).uniqueResult()).intValue(); Kp6%=JjO
criteria.setProjection UL xgvq
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(null); h2
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List items = pMkM@OH
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criteria.setFirstResult(startIndex).setMaxResults .xtam 8@
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(pageSize).list(); cgR8+o
PaginationSupport ps = %/RT}CBBsW
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new PaginationSupport(items, totalCount, pageSize, la`f@~Bbr1
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startIndex); y>ePCDR3
return ps; m4G))||9Q
} K%;=i2:
}, true); 3GXmyo:o$
} `bZgw
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public List findAllByCriteria(final SI7r`'7A'
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DetachedCriteria detachedCriteria){ 8B6-f:
return(List) getHibernateTemplate l$C
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().execute(new HibernateCallback(){ O?iLLfs
publicObject doInHibernate Xkf|^-n
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(Session session)throws HibernateException { KR>o 2
Criteria criteria = RHmT$^=
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detachedCriteria.getExecutableCriteria(session); i.e4<|{
return criteria.list(); TmJXkR.5
} ^(7Qz&q
}, true); j-t"
} 3lN@1jlh
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public int getCountByCriteria(final W?du ]
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DetachedCriteria detachedCriteria){ +(h{3Y|
Integer count = (Integer) c;88Wb<|W
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getHibernateTemplate().execute(new HibernateCallback(){ -a7BVEFts
publicObject doInHibernate 5X:3'*
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(Session session)throws HibernateException { 'AZxR4W
Criteria criteria = ix5<h }
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detachedCriteria.getExecutableCriteria(session); J@qLBe(v
return xggF:El3{
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criteria.setProjection(Projections.rowCount _Zxo<}w}y
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()).uniqueResult(); ,Uy;jk
} Us% _'}(/U
}, true); I^G6aw
return count.intValue(); kv<(N
} 4K,S5^`Gx
} P[jh^!<j
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用户在web层构造查询条件detachedCriteria,和可选的 m",G;VN
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 gZ=$bR
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PaginationSupport的实例ps。 EBpg
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ps.getItems()得到已分页好的结果集 D[{"]=-
ps.getIndexes()得到分页索引的数组 @2TfW]6
ps.getTotalCount()得到总结果数 B)rBM
ps.getStartIndex()当前分页索引 gl!ht@;>ak
ps.getNextIndex()下一页索引 vgi`.hk
ps.getPreviousIndex()上一页索引 ,q$2D,dz
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 4I2#L+W
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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 kRH
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一下代码重构了。 /mwDVP<z /
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我把原本我的做法也提供出来供大家讨论吧: e'|c59E
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首先,为了实现分页查询,我封装了一个Page类: [5Zi\'~UH)
java代码: etk|%%J
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/*Created on 2005-4-14*/ 4}]In/yA
package org.flyware.util.page; 7>-99o^W
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/** A[f`xE
* @author Joa z]j_,3Hff
* i(xL-&{
*/ Kc+9n%sp
publicclass Page { .[Ny(X/]/}
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/** imply if the page has previous page */ 2-^['R
privateboolean hasPrePage; uNpa2{S'
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/** imply if the page has next page */ =-G4BQ
privateboolean hasNextPage; d%oHcn
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/** the number of every page */ T? ,Q=.
privateint everyPage; ;!EEzR.
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/** the total page number */ aI\ ]R:f,
privateint totalPage; ictOCF
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/** the number of current page */ 8,:lw3x1
privateint currentPage; &pAmFe
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/** the begin index of the records by the current pH0MVu(W
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query */ DhG{hQ[[
privateint beginIndex; DMT2~mh
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/** The default constructor */ D
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public Page(){ :kucDQE({?
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} O! w&3 p
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/** construct the page by everyPage >P2QL>P
* @param everyPage P2 +^7x?
* */ r4 ;nkx
public Page(int everyPage){ ts=+k/Z
this.everyPage = everyPage; 5
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} JwUz4
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/** The whole constructor */ 2X=*;r"{J
public Page(boolean hasPrePage, boolean hasNextPage, 9RY}m7
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int everyPage, int totalPage, gR k+KGKn<
int currentPage, int beginIndex){ d C6t+
this.hasPrePage = hasPrePage; @FuX^Q.[
this.hasNextPage = hasNextPage; HE3x0H}o>
this.everyPage = everyPage; Y^,G}
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this.totalPage = totalPage; =UFmN"
this.currentPage = currentPage; <Kq!)) J'
this.beginIndex = beginIndex; yzJTNLff
} 0,m@BsK
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/** ffh3okyW0
* @return o&rNM5:
* Returns the beginIndex. tR-rW)0K3Q
*/ wTVd){q`.
publicint getBeginIndex(){ /Y*6mQ:
return beginIndex; }U$p[Gi<
} =%d0MZD
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/** s#V:!
7
* @param beginIndex P\.1w>X
* The beginIndex to set. FQikFy(YY
*/ l1}HJmom
publicvoid setBeginIndex(int beginIndex){ c`!8!R
this.beginIndex = beginIndex; {@3p^b*E)1
} {b26DKkQS
8,&QY%8pX
/** O:te;lQK
* @return r!O4]j_3
* Returns the currentPage. O.wk*m!9
*/ W$?Bsz)
publicint getCurrentPage(){ l|~SVk|
return currentPage; y
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} |[
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/** YDo,9
* @param currentPage Z)H9D(Za
* The currentPage to set. /?
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*/ xouy|Nn'
publicvoid setCurrentPage(int currentPage){ *61G<I
this.currentPage = currentPage; .eM
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} >-<