Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 %{
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 -mO#HZ Iq
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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 uO4
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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 L}
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分页支持类: $~5H-wJ
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java代码: y A5h^I
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package com.javaeye.common.util; QtfL'su:
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import java.util.List; YT-ua{.^
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publicclass PaginationSupport { bIm4s
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publicfinalstaticint PAGESIZE = 30; ?Tc|3U
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privateint pageSize = PAGESIZE; <Y6Vfee,&
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privateList items; a=$ZM4Bn
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privateint totalCount; f\5w@nX
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privateint[] indexes = newint[0]; 4x
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privateint startIndex = 0; Q@}SR%p
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public PaginationSupport(List items, int m>+
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totalCount){ N5)H(<}
setPageSize(PAGESIZE); wmV=GV8 d
setTotalCount(totalCount); @F 8NN\
setItems(items); g@x72$j
setStartIndex(0); 0Gj/yra9MO
} KT<i%)t2
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public PaginationSupport(List items, int Y->sJm
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totalCount, int startIndex){ E`LaO
setPageSize(PAGESIZE); /V0Put
setTotalCount(totalCount); BO}IN#
setItems(items); Vel(+HS
setStartIndex(startIndex); c\[&IlM
} K8KN<Q s]
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public PaginationSupport(List items, int A'![*O
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totalCount, int pageSize, int startIndex){ ?0u"No52m
setPageSize(pageSize); Tq*<J~-
setTotalCount(totalCount); zt]8F)l@
setItems(items); E\Wd*,/v)
setStartIndex(startIndex); M`#g>~bI#R
} Y&M {7
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publicList getItems(){ L})fYVX
return items; zZ9Ei-Q
} rv)Eg53Q
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publicvoid setItems(List items){ H[g i`{c
this.items = items; [$$R>ELYQ
} 'M?pg$ta_V
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publicint getPageSize(){ ZHwN3
return pageSize; q 7W7sw
} /Re67cMQ*
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publicvoid setPageSize(int pageSize){ D}{]5R
this.pageSize = pageSize; oN83`Z
} Z[RifqaBby
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publicint getTotalCount(){ Vl(id_~ _
return totalCount; [$>@f{:
} 5^qs>k[mN
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publicvoid setTotalCount(int totalCount){ 1)xj 'n
if(totalCount > 0){ ,rY}IwMw
this.totalCount = totalCount; F_}y[Yn^
int count = totalCount / MD0d
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pageSize; /K,@{__JP
if(totalCount % pageSize > 0) su60j^e*
count++; ;8]Hw a1!
indexes = newint[count]; *xeJ4h
for(int i = 0; i < count; i++){ kmJ<AnK
indexes = pageSize * g]b%<DJ
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i; Y}\3PaUa
} <qoPBm])
}else{ Q."rE"}<
this.totalCount = 0; Me+)2S 9
} EL
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}
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publicint[] getIndexes(){ Yk7^?W
return indexes; o:%;AOcl
} p:!FB8
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publicvoid setIndexes(int[] indexes){ MLmk=&d
this.indexes = indexes; |L)qH"Eo
} gi/W3q3c6
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publicint getStartIndex(){ aTLr%D:Ka
return startIndex; %)r1?H} #%
} J
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publicvoid setStartIndex(int startIndex){ Z3 na .>Z
if(totalCount <= 0) yA<\?Ps
this.startIndex = 0; 7YU}-gi
elseif(startIndex >= totalCount)
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this.startIndex = indexes n*qn8Dq
*_uGzGB&G
[indexes.length - 1]; ]!N|3"Ls
elseif(startIndex < 0) wo ) lkovd
this.startIndex = 0; eG5xJA^
else{ eKqo6P:#f
this.startIndex = indexes Nu%MXu+
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[startIndex / pageSize]; >uz3 O?z P
} l9$"zEC
} -sk!XWW+
!*-|s}e
publicint getNextIndex(){ ?7aeY5p
int nextIndex = getStartIndex() + v1s0kdR,>
WS ^%<
h#
pageSize; sMWNzt
if(nextIndex >= totalCount) h!]=)7x;
return getStartIndex(); NB)22 %
else (yhnv Z
return nextIndex; -xU4s
} ywbdV-t/
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publicint getPreviousIndex(){ lyyRyFfQ
int previousIndex = getStartIndex() - p#AQXIF0
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pageSize; ' u4TI=[6
if(previousIndex < 0) C.9l${QU
return0; Gmh6|Dsg
else IX 2 dic'
return previousIndex; 5g;i{T/6~x
} CR'1,
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} 96S#Q*6+R
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抽象业务类 #Q61c
java代码: NN@'79x
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/** jk fc=O6^
* Created on 2005-7-12 k^*S3#"
*/
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package com.javaeye.common.business; *VgiJ
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import java.io.Serializable; Ud'/
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import java.util.List; %oHK=],|1
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import org.hibernate.Criteria; eNX!EN(^
import org.hibernate.HibernateException; 6_kv~`"t Z
import org.hibernate.Session; ?_nbaFQK3
import org.hibernate.criterion.DetachedCriteria; IcP\#zhEv
import org.hibernate.criterion.Projections; VQwF9Iq]`
import EN;s
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6-J%Z%yT #
org.springframework.orm.hibernate3.HibernateCallback; S>V+IKW;(
import <S68UN(Ke
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org.springframework.orm.hibernate3.support.HibernateDaoS 6,a:s:$>}R
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upport; N|\Q:<!2_w
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import com.javaeye.common.util.PaginationSupport; NWS3-iZ|8
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public abstract class AbstractManager extends ;{89 *e*)
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HibernateDaoSupport { <sli!rv
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privateboolean cacheQueries = false; (NC]S
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privateString queryCacheRegion; XR|U6bf]
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publicvoid setCacheQueries(boolean |ya.c\}q
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cacheQueries){ )k.}>0K |
this.cacheQueries = cacheQueries; LR#BP}\b'
} `3:Q.A_?
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publicvoid setQueryCacheRegion(String S`8Iu[Ma
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queryCacheRegion){ @2g
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this.queryCacheRegion = % 'OY
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queryCacheRegion; 4-m6e$p;
} \{v e6`7Rn
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publicvoid save(finalObject entity){ m~0Kos%^*b
getHibernateTemplate().save(entity); G>Hg0u0!,
} }i{A4f`
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publicvoid persist(finalObject entity){ wJj:hA}
getHibernateTemplate().save(entity); A `{hKS
} H*e +
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publicvoid update(finalObject entity){ yd=b!\}WJ
getHibernateTemplate().update(entity); ,Qs%bq{t
} $,P:B%]
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publicvoid delete(finalObject entity){ Ec2;?pvd%J
getHibernateTemplate().delete(entity); Q(36RX%@
} o7t{?|
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publicObject load(finalClass entity, SA7(EJ95
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finalSerializable id){ Evd|_ W-
return getHibernateTemplate().load -n8d#Qm)
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(entity, id); J#t-."f6^
} 1
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publicObject get(finalClass entity, GC:q6}
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finalSerializable id){ 8CZ%-}-%$
return getHibernateTemplate().get *~>p;*
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(entity, id); %IZd-N7i^
} 8xg^="OJ
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publicList findAll(finalClass entity){ Fj(GyPFG
return getHibernateTemplate().find("from x Ek8oc
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" + entity.getName()); 4e Y?#8
} X fqhD&g
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publicList findByNamedQuery(finalString HA*L*:0
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namedQuery){ #
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return getHibernateTemplate c~?Zmdn:
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().findByNamedQuery(namedQuery); ZGDT
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} uO`MA%
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publicList findByNamedQuery(finalString query, qS2Nk.e]o
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finalObject parameter){ AoeRoqg
return getHibernateTemplate \7uM5 k}l
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h@yn
().findByNamedQuery(query, parameter); 6e B;
} s:Ml\['x
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publicList findByNamedQuery(finalString query, *L$2M?xkY
[/UchU]DT
finalObject[] parameters){ odsFgh
return getHibernateTemplate )&Oc7\J,
hd(FOKOP
().findByNamedQuery(query, parameters); DS<1"4 b|
} {O^u^a\m
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publicList find(finalString query){ &$F<]]&
return getHibernateTemplate().find #_@cI(P
xi=ApwNj
(query); lUm(iYv;H
} DPTk5o[
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publicList find(finalString query, finalObject 8AuBs;i
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parameter){ 4^tSg#!V{
return getHibernateTemplate().find hfaU-IPcFX
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(query, parameter); uZS :
} L>1hiD&
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public PaginationSupport findPageByCriteria qN)y-N.LI(
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(final DetachedCriteria detachedCriteria){ G%<}TI1}
return findPageByCriteria ,#A(I#wL~
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); tnRf!A;m
} QJGGce
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public PaginationSupport findPageByCriteria Oj5UG*
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(final DetachedCriteria detachedCriteria, finalint J7+G"_)'
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startIndex){ M"~jNe|
return findPageByCriteria 1i76u!{U
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(detachedCriteria, PaginationSupport.PAGESIZE, t]yxLl\
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startIndex); wVs?E
} Q`ua9oIJ=
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public PaginationSupport findPageByCriteria )h{&O
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(final DetachedCriteria detachedCriteria, finalint ~MC|
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pageSize, ^X=Q{nB
finalint startIndex){ 3nq?Y8yac
return(PaginationSupport) 6j<9Y
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getHibernateTemplate().execute(new HibernateCallback(){ {i5?R,a)
publicObject doInHibernate sVLvnX,
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(Session session)throws HibernateException { t&r.Kf9Z\
Criteria criteria = F^i3e31*t
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detachedCriteria.getExecutableCriteria(session); (`x_MTLL
int totalCount = [GwAm>k
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((Integer) criteria.setProjection(Projections.rowCount ;Rrh$Ag
*}?[tR5
()).uniqueResult()).intValue(); th?+TNb^
criteria.setProjection E
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(null); :6n#y-9^1
List items = mw@Pl\=
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criteria.setFirstResult(startIndex).setMaxResults L*@`i ]jl
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(pageSize).list(); MK&,2>m,A
PaginationSupport ps = TCr4-"`r-{
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new PaginationSupport(items, totalCount, pageSize, du65=w4E!
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startIndex); asWk]jjMG
return ps; :4ryi&Y
} HJL! ;i
}, true); 'jev1u[
} CM6% g f3
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public List findAllByCriteria(final 4TtC~#D:
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DetachedCriteria detachedCriteria){ +m=b
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return(List) getHibernateTemplate l:HQ@FX
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().execute(new HibernateCallback(){ uD\R3cY
publicObject doInHibernate i7x&[b
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(Session session)throws HibernateException { c%&,(NJ]K
Criteria criteria = "?"
:
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detachedCriteria.getExecutableCriteria(session); u
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return criteria.list(); ak(s@@k
} K#3^GB3P
}, true); 5 jrR]X
} xIdb9hm<
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public int getCountByCriteria(final .K
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DetachedCriteria detachedCriteria){ aDS:82GMQ
Integer count = (Integer) l@`k:?
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getHibernateTemplate().execute(new HibernateCallback(){ &;Ncc,jb
publicObject doInHibernate "x$@^
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(Session session)throws HibernateException { {`HbpM<=m]
Criteria criteria = gS(3 m_
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detachedCriteria.getExecutableCriteria(session); NlYuT+
return :zW? O#aL-
)nd^@G^
criteria.setProjection(Projections.rowCount \kE0h\
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()).uniqueResult(); Q Xd`P4a
} xQR/Xp!h
}, true); It*U"4lgi
return count.intValue(); \`.v8C>vG
} *`a$6F7m4
} r] /Ej!|
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用户在web层构造查询条件detachedCriteria,和可选的 gs<~)&x
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 lhM5a
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PaginationSupport的实例ps。 UVDMYA0
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ps.getItems()得到已分页好的结果集 NXD-
ps.getIndexes()得到分页索引的数组 =1 Plu5
ps.getTotalCount()得到总结果数 nscnG5'{+
ps.getStartIndex()当前分页索引 +B{u,xgg
ps.getNextIndex()下一页索引 )[eTZg
ps.getPreviousIndex()上一页索引 Zx8$M5
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 k8G4CFg}wP
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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 :TVo2Zm[@
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一下代码重构了。 v1u~[c=|^
sc t3|H#
我把原本我的做法也提供出来供大家讨论吧: 46M=R-7=
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首先,为了实现分页查询,我封装了一个Page类: 3 85qQppz
java代码: /.s
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/*Created on 2005-4-14*/ T6SYXQd>.
package org.flyware.util.page; =Crl{Ax
ka=A:biz
/** ZYY`f/qi
* @author Joa AW;xlY= g
* p v4#`.m
*/ Z9H2! Cp
publicclass Page { DmWa!5
C-_u`|jQ
/** imply if the page has previous page */ ?gu!P:lZS
privateboolean hasPrePage; EId>%0s5
>q')%j
/** imply if the page has next page */ X'.lh#&
privateboolean hasNextPage; 5T"h7^}e
Tq^B>{S"
/** the number of every page */ A?-t`J
privateint everyPage; )-XD=
]
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/** the total page number */ Dd
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privateint totalPage; !#1UTa
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/** the number of current page */ 'e>'JZR
privateint currentPage; ?mi}S${g
3]NKAPY
/** the begin index of the records by the current D41.$t[
0/fwAp
query */ gjJ:s,Fg
privateint beginIndex; g5nL7;`N
%}
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/** The default constructor */ # b3 14
public Page(){ fX
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I]#x0 ?D
} BL0xSNE**
? _[q{i{
/** construct the page by everyPage s2tNQtq0W
* @param everyPage ip|l3m$ Mi
* */ ;F2"gTQS
public Page(int everyPage){ >'3nsR
this.everyPage = everyPage; vA?3kfL|#
} O/l/$pe
gE23C*!'&:
/** The whole constructor */ =4/K#cQ
public Page(boolean hasPrePage, boolean hasNextPage, 9:!V":8q
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}.A
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int everyPage, int totalPage, UJ)(Sw
int currentPage, int beginIndex){ ^Y"|2 :
this.hasPrePage = hasPrePage; I_`$$-|
this.hasNextPage = hasNextPage; 7Zh#7jiZ`
this.everyPage = everyPage; u~'j?K.^
this.totalPage = totalPage; y<ZT~e
this.currentPage = currentPage; ad<ZdO*h
this.beginIndex = beginIndex; qwuA[QkPi
} K pKZiUQm
]%(X}]}
/** Uot LJa
* @return W>$mU&ew[
* Returns the beginIndex. !$0ozDmD
*/ \`?4PQ
publicint getBeginIndex(){ IP#qT
`=}
return beginIndex; kI^Pu
} kybDw{(}gc
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/** Yx"~_xA/u
* @param beginIndex p=dM2>
* The beginIndex to set. NHD`c)Q
*/ rVb61$
publicvoid setBeginIndex(int beginIndex){ B|kIiL63
D
this.beginIndex = beginIndex; r4pR[G._
} %xwtG:IKEV
NY%=6><t!
/** p~<d8n4UH
* @return pq*4yaTT'
* Returns the currentPage. s,8g^aF4
*/ 8^qLGUxz
publicint getCurrentPage(){ R5rCCp
return currentPage; =BgQSs/^c
}
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,M9Hdm
/** (x8D ]a
* @param currentPage 0'II6,:
* The currentPage to set. \aGTi
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*/ ^r^) &]
publicvoid setCurrentPage(int currentPage){ ^}<h_T?<_-
this.currentPage = currentPage; t|cTl/i
4
} %8! }" Xa
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/** Yi#U~ h
* @return j#
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* Returns the everyPage. sEEyN3 N
*/ S,^)\=v
publicint getEveryPage(){ )\fLS d
return everyPage; c>yqq'
} 2sahb#e
)
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/** uxD$dd?
* @param everyPage 6,Y<1b*|Vo
* The everyPage to set. l5CFm8%
*/ 6@geakq
publicvoid setEveryPage(int everyPage){ &bT \4
this.everyPage = everyPage; cP`[/5R
} S3.76&
f|'8~C5I@>
/** /}#@uC
* @return )~H&YINhn
* Returns the hasNextPage. ^Qa!{9o[
*/ qfl #ki`,
publicboolean getHasNextPage(){ |Y]4PT#EE
return hasNextPage; fFJu]
} db5@+_
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/** KkD&|&!Q7u
* @param hasNextPage K%RjWX=H
* The hasNextPage to set. \9T/%[r#
*/ Ee 15Y$1
publicvoid setHasNextPage(boolean hasNextPage){ qB8R4wCf
this.hasNextPage = hasNextPage; ?)?}^
} xmBGZ4f%
fH*1.0f]6
/** Uy5G,!
* @return m9 D'yXZ
* Returns the hasPrePage. x4%1P w
*/ +jN%w{^=
publicboolean getHasPrePage(){ VFLW@
return hasPrePage; mo
} Hh{pp ^
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/** B`?}jJa9*
* @param hasPrePage X&s"}Hf
* The hasPrePage to set. gjDxgNpa
*/ g8L{xwx<
publicvoid setHasPrePage(boolean hasPrePage){ EEdU\9DH(
this.hasPrePage = hasPrePage; %E*Q0/
} 3*!w c.=
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/** TAp8x
* @return Returns the totalPage. &"'Z)iWm
* Z+g9!@'a
*/ 3:"w"0[K3
publicint getTotalPage(){ l _g JC.
return totalPage; 5Vj O:>
} s|\\"3
v$~$_K
/** gnN"6r1
* @param totalPage 2wwJ>iR`
* The totalPage to set. iOJ5KXrAO
*/ OAo;vC:^
publicvoid setTotalPage(int totalPage){ 0S2/,[-u+
this.totalPage = totalPage; j06qr\Es
} {@ Z=b5/P
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} mnL+@mm
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 .,F`*JVFq
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个PageUtil,负责对Page对象进行构造: Y49&EQ
java代码: aM+Am,n`@
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/*Created on 2005-4-14*/ 89Ir}bCr
package org.flyware.util.page; pp@O6
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import org.apache.commons.logging.Log; Ey=ymf.}
import org.apache.commons.logging.LogFactory; 7n,=`0{r
-2'1KAk-W
/** RT|1M"?$
* @author Joa "
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* +kN,OK~
*/ % {-r'Yi%
publicclass PageUtil { c:aW"U
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privatestaticfinal Log logger = LogFactory.getLog V*DD U]0k
}bSDhMV;
(PageUtil.class); ,^RZ1tLz
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/** )-0+O=v
* Use the origin page to create a new page `hdN 6PgK
* @param page >#)%/Ti}DU
* @param totalRecords yi:}UlO
* @return 5'( T*"
*/ IXG@$O?y/
publicstatic Page createPage(Page page, int k* v${1&
n
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totalRecords){ 3b|=V
return createPage(page.getEveryPage(), Si@6'sw
wX$|(Y}
page.getCurrentPage(), totalRecords); ':3[?d1Es
} C1+f\A|9FP
8
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/** RL$%Vy0
* the basic page utils not including exception g/_0WW] }
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handler "iR:KW@
* @param everyPage )ki
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* @param currentPage l4dG=x}M]
* @param totalRecords Q6wa-Y,
* @return page r<4j;"lQK
*/ ,<Z,- 0S
publicstatic Page createPage(int everyPage, int UhrRB
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currentPage, int totalRecords){ jJ-C\
v
everyPage = getEveryPage(everyPage); rwVp}H G
currentPage = getCurrentPage(currentPage); d^J)Mhju
int beginIndex = getBeginIndex(everyPage, 22=sh;y+2
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currentPage); ~\8(+qIv%f
int totalPage = getTotalPage(everyPage, d#]hqy
Fi67 "*gE
totalRecords); fIl!{pv[
boolean hasNextPage = hasNextPage(currentPage, _Z!@#y@j
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totalPage); WubV?NX;EF
boolean hasPrePage = hasPrePage(currentPage); !yxqOT-
KbtV>
returnnew Page(hasPrePage, hasNextPage, ]gg(Z!|iQ
everyPage, totalPage, D[ #V
currentPage, QF\nf_X
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beginIndex); AB`.K{h
} ,aLwOmO
.1jiANY
privatestaticint getEveryPage(int everyPage){ j7gw?,
return everyPage == 0 ? 10 : everyPage; 3,Yr%`/5'
} >>,G3/Zd*
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privatestaticint getCurrentPage(int currentPage){ Xs2 jR14`
return currentPage == 0 ? 1 : currentPage; .WqqP
} j}eb
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privatestaticint getBeginIndex(int everyPage, int twq~.:<o
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currentPage){ %g}d}5s
return(currentPage - 1) * everyPage; ur\6~'l4
}
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privatestaticint getTotalPage(int everyPage, int c\1X NPGG
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totalRecords){ 3X`9&0:j%
int totalPage = 0; >ep<W<b
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if(totalRecords % everyPage == 0) 1xW!j!A;
totalPage = totalRecords / everyPage; 7;fC%Fq
else fx5S2%f^
totalPage = totalRecords / everyPage + 1 ; 8m?(* [[
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return totalPage; *9EwZwE_K
} 2!J#XzR0W
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privatestaticboolean hasPrePage(int currentPage){ p2Ep(0w,R5
return currentPage == 1 ? false : true; UhDQl%&He
} 9{jMO
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privatestaticboolean hasNextPage(int currentPage, -[7+g
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int totalPage){ DWt|lO
return currentPage == totalPage || totalPage == x|0C0a\"A
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0 ? false : true; 89FAh6u E
} i-OD"5a`
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} L3, /7
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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。 yW|J`\`^T
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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 odhS0+d^
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做法如下: Fc5.?X-
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 ~S8:xG+s
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的信息,和一个结果集List: zEI+)|4?r
java代码: M&V'*.xz
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/*Created on 2005-6-13*/ x6UXd~
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package com.adt.bo; [H}>
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import java.util.List; T8o](:B~
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*.
import org.flyware.util.page.Page; k[r^@|
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/** -5<[oBL;
* @author Joa f{P1.?a
*/ pm6#azQ
publicclass Result { o$No@~%v
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private Page page; TR DQ+Z
m/=nz.
private List content; +RooU?Aq
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/** m+(Cl#+
* The default constructor @2>UR9j
*/
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public Result(){ 6
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super(); A=<7*E
} &hYgu3O
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/** 4aXIRu%#7
* The constructor using fields
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* `c
* @param page d[a(uWEl
* @param content #3&@FzD_P
*/ y]h0c<NP
public Result(Page page, List content){ P 9?cp{*
this.page = page; (]]hSkE
this.content = content; g|~px$<iY
} K\K& K~Z
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/** 37hdZt.,
* @return Returns the content. cH5i420;aO
*/ '_c/CNs
publicList getContent(){ ]oGd,v X
return content; bzi"7%c
} <[dcIw<7
yv,FzF}7
/** Ta?J;&<u]/
* @return Returns the page. B>2R-pa4~
*/ 5JzvT JMx
public Page getPage(){ _b&|0j:Ud
return page; a'VQegP(f\
} F6\{gQ<E
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/** D3Q+K
* @param content e9LX0=
* The content to set. /oPW0of
*/ "to!&@I|
4
public void setContent(List content){ [Sm<X
this.content = content; @O#!W]6NT6
} gVG^R02#<k
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/** !5*VBE\
* @param page -@N-i$!;J
* The page to set. DGvuo 8
*/ V(S7mA:T
publicvoid setPage(Page page){ -E7mt`:d
this.page = page; k~[jk5te
} L.;b(bFe
} tc~gn!"
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ifn=De3+
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2. 编写业务逻辑接口,并实现它(UserManager, R_EU|a
TEV DES
UserManagerImpl) lelmX
java代码: 0,hs%x>v
>2#<gp3
-zK>{)Z=q
/*Created on 2005-7-15*/ WuK<?1meN
package com.adt.service; N'b GL%
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import net.sf.hibernate.HibernateException; &4%pPL\f
#S7oW@
import org.flyware.util.page.Page; 0AM_D >fH
Cmx<>7fN
import com.adt.bo.Result; 2Bt/co-~4
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/** m=}h7&5 p
* @author Joa 2|k$Vfz
*/ KS_+R@3Z
publicinterface UserManager { a?gF;AYk
Le#srr
public Result listUser(Page page)throws 0H_Ai=G
}+jB5z'w
HibernateException; ^fF#Ej1
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} xh;gAh5n
jI,[(Z>
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/Am9w$_T[
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java代码: +"84.PZ
DT-.Gdb8
@Z/jaAjUC
/*Created on 2005-7-15*/ K qJE?caw
package com.adt.service.impl; hT^&