Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 )pW(Cp
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 z?Hvh
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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 srw5&s(3X
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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 6 80i?=z
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分页支持类: FzXVNUMP
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java代码: F!tn|!~
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package com.javaeye.common.util; i:ZpAo+Z{
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import java.util.List; M#IGq
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publicclass PaginationSupport { /g< T)$2
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publicfinalstaticint PAGESIZE = 30; "9Sxj
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privateint pageSize = PAGESIZE; #O7|&DqF{
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privateList items; b6 &`]O;%
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privateint totalCount; f5IO<(:E^
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privateint[] indexes = newint[0]; KcF2}+iM
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privateint startIndex = 0; B-
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public PaginationSupport(List items, int g|a2z_R
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totalCount){ ff**) Xdh
setPageSize(PAGESIZE); Ji\8(7
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setTotalCount(totalCount); -\:pbR
setItems(items); N J9H=
setStartIndex(0); v<,?%(g)7
} LNmsv U
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public PaginationSupport(List items, int ~Y<x-)R
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totalCount, int startIndex){ ]O3[Te
setPageSize(PAGESIZE); (y7U}Sb'
setTotalCount(totalCount); s(q\!\FS
setItems(items); ]xBQ7Xqf|
setStartIndex(startIndex); c!AGKc
} !n~p?joJ*
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public PaginationSupport(List items, int uli,@5%\
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totalCount, int pageSize, int startIndex){ *q{/`Z{wy
setPageSize(pageSize); a02@CsH
setTotalCount(totalCount); &ok2Xw
setItems(items); C s?kZ
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setStartIndex(startIndex); t5G@M&d4Eo
} id8a#&t]
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publicList getItems(){
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return items; MYFRrcu;
} N%'=el4L
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publicvoid setItems(List items){ ?u{y[pI6
this.items = items; `ySLic`
} O+A/thI%*S
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publicint getPageSize(){ 6;i]v|M-
return pageSize; Jf{6'Ub
} U@x5cw:
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publicvoid setPageSize(int pageSize){ ,Ua`BWF
this.pageSize = pageSize; H]K(`)y}4
} 1nhC! jDD
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publicint getTotalCount(){ z)I.^
return totalCount; ig3HPlC
} 7'\<\oT
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publicvoid setTotalCount(int totalCount){ 7'uuc]\5>
if(totalCount > 0){ 4Z5ZV!
this.totalCount = totalCount; J=|PZ2"
int count = totalCount / . S4Xw2MS
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pageSize; //S/pCqED
if(totalCount % pageSize > 0) GZ(
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count++; ya8MjGo
indexes = newint[count]; sr1 `/
for(int i = 0; i < count; i++){ `3m7b!0k
indexes = pageSize * h BD .IB
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} |Y?1rLC
}else{ C&?Z\$
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this.totalCount = 0; KvW{M
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} +Z99x#
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publicint[] getIndexes(){ %>u(UmFO
return indexes; }wZ9#Ll
} Hz39v44
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publicvoid setIndexes(int[] indexes){ =wbgZr^2
this.indexes = indexes; "@uKe8r|y
} D>neY9
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publicint getStartIndex(){ &p|+K
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return startIndex; eU/o I} A
} _M[@a6?
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publicvoid setStartIndex(int startIndex){ _D<=Yo
if(totalCount <= 0) ((OQs.
this.startIndex = 0; !7)` g i
elseif(startIndex >= totalCount) x~3N})T5
this.startIndex = indexes R|4a9G
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[indexes.length - 1]; kF{'?R5w
elseif(startIndex < 0) Q>OBK&'
this.startIndex = 0; ppL*#/jYt
else{ /Mq9~oC
this.startIndex = indexes j~DTvWg<Jl
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[startIndex / pageSize]; Bgw=((p
} m/M=.\]
} 8<0~j
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publicint getNextIndex(){ \_GG6
int nextIndex = getStartIndex() + #GoZH?MAF
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pageSize; OGA_3|[S
if(nextIndex >= totalCount) X8m@xFW}
return getStartIndex(); sn>2dRW{
else wAt|'wP
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return nextIndex; lk/T|0])
} G#uD CF,O
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publicint getPreviousIndex(){ (3. B\8s
int previousIndex = getStartIndex() - TPE1}8p17
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pageSize; _mBFmXHHS$
if(previousIndex < 0) kD}w5 U
return0; <I
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else *P:!lO\|
return previousIndex; 8D]&wBR:
} 5)@UpcjUA
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} g]$e-X@k
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抽象业务类 '?gF9:
java代码: ,`Yx(4!rR
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/** JKjVrx>
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* Created on 2005-7-12 y"I8^CA
*/ a62'\wF>D
package com.javaeye.common.business; " J4?Sb <
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import java.io.Serializable; 4{v?<x8
import java.util.List; ._X|Ye9/
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import org.hibernate.Criteria; {9c_T!c
import org.hibernate.HibernateException; [gkOwU=?
import org.hibernate.Session;
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import org.hibernate.criterion.DetachedCriteria; cVYPPal
import org.hibernate.criterion.Projections; ,5XDH6L1
import '=V1'I*
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org.springframework.orm.hibernate3.HibernateCallback; F'^y?UP[
import n/ CP2A
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org.springframework.orm.hibernate3.support.HibernateDaoS /EvnwYQy
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upport; K%@#a}kRb
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import com.javaeye.common.util.PaginationSupport; qX"m"ko
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public abstract class AbstractManager extends cx_$`H
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HibernateDaoSupport { *eEn8rAr
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privateboolean cacheQueries = false; e_h`x+\:
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privateString queryCacheRegion; [+3~wpU(p
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publicvoid setCacheQueries(boolean 3bK=Q3N
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cacheQueries){ }nt,DG!r
this.cacheQueries = cacheQueries; aUyJi
} *USzzLq
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publicvoid setQueryCacheRegion(String C%QC^,KL
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queryCacheRegion){ =|O><O|
this.queryCacheRegion = |QO)xEn~
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queryCacheRegion; FV>xAU$
} <=gf|(
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publicvoid save(finalObject entity){ r.10b]b
getHibernateTemplate().save(entity); G&\!!i|IQ
} x)prI6YMv\
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publicvoid persist(finalObject entity){ 2`cVi"U
getHibernateTemplate().save(entity); )A*Sl2ew
} IfF&QBi
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publicvoid update(finalObject entity){ *rmwTD"
getHibernateTemplate().update(entity); nOdAp4{:q%
} tg%C>O
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publicvoid delete(finalObject entity){ J%ue{PL7
getHibernateTemplate().delete(entity); F^}n7h=qk
} fS- 31<?
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publicObject load(finalClass entity, F/chE c
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finalSerializable id){ ~glFB`?[
return getHibernateTemplate().load P(XNtQ= K
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(entity, id); 2apQ4)6#[H
} i \u"+:j
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publicObject get(finalClass entity, J6*B=PX=(
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finalSerializable id){ 9KLhAYaq
return getHibernateTemplate().get ;WpPdR2
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(entity, id); hR3Pa'/i
} K#],4OG
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publicList findAll(finalClass entity){ 8L}N,6gC4_
return getHibernateTemplate().find("from z0m[25FQG
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" + entity.getName()); 4!r>
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} .`Ts'0vVy
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publicList findByNamedQuery(finalString J"dp?i
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namedQuery){ )gAFz+
return getHibernateTemplate k&>l#oH
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().findByNamedQuery(namedQuery); 5`3f"(ay/
} D7Nz3.j
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publicList findByNamedQuery(finalString query, AFcA5:ja
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finalObject parameter){ =7Y gES
return getHibernateTemplate W<uL{k.Kpd
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().findByNamedQuery(query, parameter); lC|{{?m
} B<Ynx_95
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publicList findByNamedQuery(finalString query, fJ3qL#'
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finalObject[] parameters){ $PQlaivA
return getHibernateTemplate cMEM}Qh
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().findByNamedQuery(query, parameters); ].2it{gF?b
} T7.u7@V2
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publicList find(finalString query){ V8xv@G{;
return getHibernateTemplate().find ]&ptld;
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(query); n~d`PGs?f
} u0J+Nj9
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publicList find(finalString query, finalObject m`c(J1Et
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parameter){ 4[!&L:tR
return getHibernateTemplate().find '}5}wCLA
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(query, parameter); ZX.VzZS
} ':!;6v|L
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public PaginationSupport findPageByCriteria ANCgch\
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(final DetachedCriteria detachedCriteria){ DZXv3gnX
return findPageByCriteria \Rp)n=|
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); w'5~GhnP+
} =dX*:An
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public PaginationSupport findPageByCriteria 3MjMN %{P
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(final DetachedCriteria detachedCriteria, finalint KX<RD|=
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startIndex){ (p14{
return findPageByCriteria 8XJ%Yuu
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(detachedCriteria, PaginationSupport.PAGESIZE, ~:)$~g7>b
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startIndex); 6g$04C3tHi
} CaBTqo
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public PaginationSupport findPageByCriteria 2z[Pw0#V
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(final DetachedCriteria detachedCriteria, finalint Gcs+@7!b
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pageSize, +Kq>r|;
finalint startIndex){ jSYj+k
return(PaginationSupport) ^1cqx]>E
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getHibernateTemplate().execute(new HibernateCallback(){ yJp&A
publicObject doInHibernate 8:&@MZQ&!
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(Session session)throws HibernateException { Pm?6]] 7
Criteria criteria = wqGZkFg1
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detachedCriteria.getExecutableCriteria(session); p[o2F5 T2
int totalCount = `P z !H
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((Integer) criteria.setProjection(Projections.rowCount IeU.T@ $
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()).uniqueResult()).intValue(); D!mhR?t
criteria.setProjection +bO{UC[
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(null); Zh(f2urKV
List items = by06!-P0[
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criteria.setFirstResult(startIndex).setMaxResults Zka;}UL&Q
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(pageSize).list(); Z9sg6M@s
PaginationSupport ps = p~mB;pZ%;
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new PaginationSupport(items, totalCount, pageSize, !c&^b@
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startIndex); x9ws@=[:
return ps; )T3wU~%
} ry<
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}, true); n)=&=Uj`f
} =0:hrg+Zgx
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public List findAllByCriteria(final 4YCGh
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DetachedCriteria detachedCriteria){ 1Jd: %+T
return(List) getHibernateTemplate X%-4x
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().execute(new HibernateCallback(){ Qpc{7#bp
publicObject doInHibernate @<PL
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(Session session)throws HibernateException { >r*Zm2($MR
Criteria criteria = wLO/2V}/
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detachedCriteria.getExecutableCriteria(session); Q d./G5CC
return criteria.list(); fr?eOigbl
} )6j:Mbz
}, true); 3edAI&a5
} Xm4wuX"e=
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public int getCountByCriteria(final zXD@M{
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DetachedCriteria detachedCriteria){ L~$RF {$
Integer count = (Integer) ;E&XFTdO
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getHibernateTemplate().execute(new HibernateCallback(){ R3PhKdQ"
publicObject doInHibernate CQ`(,F3(
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(Session session)throws HibernateException { Dk-L4FS
Criteria criteria = 7S`H?},sR
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detachedCriteria.getExecutableCriteria(session); U)!AH^{32
return E;4a(o]{t
@}gdOaw
criteria.setProjection(Projections.rowCount .9xGLmg
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()).uniqueResult(); >+#[O"
} |- fx
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}, true); =I(s7=Liu
return count.intValue(); %awS*
} *LRGfk+h
} ie!4z34
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用户在web层构造查询条件detachedCriteria,和可选的 rieQ&Jt"
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 76b7-Nj"
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PaginationSupport的实例ps。 DBUwf1=qj
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ps.getItems()得到已分页好的结果集 J[H?nX9
ps.getIndexes()得到分页索引的数组 -G;1U
ps.getTotalCount()得到总结果数 i!3K G|V
ps.getStartIndex()当前分页索引 ]3xa{h~4
ps.getNextIndex()下一页索引 )^N8L<
ps.getPreviousIndex()上一页索引 E/ZJ\@gzD
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 )6&\WNL-x
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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 P(epG?Qg
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一下代码重构了。 Vb^s 'k
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我把原本我的做法也提供出来供大家讨论吧: /K) b0QX
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首先,为了实现分页查询,我封装了一个Page类: tR*W-%
java代码: d7J[.^\
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/*Created on 2005-4-14*/ lE)rRG+JLW
package org.flyware.util.page; I~LQ1_
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/** &OR