Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 K]%N-F>r
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 dp33z"<3
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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 QId"Cl)3
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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 e2qpJ4i
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分页支持类: fuQ4rt[i
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java代码: X9DM^tt
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package com.javaeye.common.util; 3"f)*w7d
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import java.util.List; 'MSEki67
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publicclass PaginationSupport { /0Rt +`
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publicfinalstaticint PAGESIZE = 30; .jLMl*6%:
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privateint pageSize = PAGESIZE; D$Kz9GVZq
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privateList items; e~tr^$/ (
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privateint totalCount; xI-=tib
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privateint[] indexes = newint[0]; ',L{CQA?c
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privateint startIndex = 0; k,
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public PaginationSupport(List items, int J(3gT}z-
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totalCount){ Fl8w7LcF7
setPageSize(PAGESIZE); i# CaKS
setTotalCount(totalCount); / c4;3>IS
setItems(items); !G+n"-h9'
setStartIndex(0); aW52.X z%8
} E1$Hu{
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public PaginationSupport(List items, int \[@Q}k[
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totalCount, int startIndex){ ({D}QEP
setPageSize(PAGESIZE); <K=@-4/Bp
setTotalCount(totalCount); Eqz4{\
setItems(items); ?|%\<h@;
setStartIndex(startIndex); N*_/@qM> a
} z Y$X|=f
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public PaginationSupport(List items, int zz7Y/653
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totalCount, int pageSize, int startIndex){ |@T5$Xg]5
setPageSize(pageSize); o(B<!ji~'
setTotalCount(totalCount); J=f:\]@Oy
setItems(items); j
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setStartIndex(startIndex); {bAWc.
} NB|RZf9M
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publicList getItems(){ Yio>ft&g]
return items; x.0k%H
} v>x {jZkFL
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publicvoid setItems(List items){ bLU^1S8Z
this.items = items; FYx `o\
} 5Z4(J?n
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publicint getPageSize(){ ~ LJ>WA
return pageSize; !=~s/{$PE
} .}L-c>o"o
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publicvoid setPageSize(int pageSize){ 8`L#1ybMO
this.pageSize = pageSize; t
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} U}A|]vi@
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publicint getTotalCount(){ Q1O_CC}
return totalCount; b7W=HR
} `:-@E2
3/A!_Uc(
publicvoid setTotalCount(int totalCount){ 1Pw(.8P
if(totalCount > 0){ wW6mYgPN%
this.totalCount = totalCount; fg>B
int count = totalCount / 7yqSt)/U
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pageSize; %
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qJ5
if(totalCount % pageSize > 0) !I~C\$^U
count++; m>Yo9/XpZ
indexes = newint[count]; .-O@UQx.I
for(int i = 0; i < count; i++){ 8%vh6$s6/
indexes = pageSize * i-:8TfI,
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i; rm5T=fNJ
} 2yEO=SN,(
}else{ Vid{6?7kh
this.totalCount = 0; ex@,F,u>o
} E1U 4v&P
} A}t&-
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publicint[] getIndexes(){ U- *8%>Qp
return indexes; =ELDJt
} *MnG-\{j
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publicvoid setIndexes(int[] indexes){ BST7y4R)BS
this.indexes = indexes; Cu
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} +qh <
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publicint getStartIndex(){ *x*,I,03
return startIndex; (.@p4q Q-
} m
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publicvoid setStartIndex(int startIndex){ *D09P%
if(totalCount <= 0) HX /GLnY/X
this.startIndex = 0; |&0"N[t
elseif(startIndex >= totalCount) .%J?T5D
this.startIndex = indexes xnRp/I
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[indexes.length - 1]; (A] m=
elseif(startIndex < 0) k+7M|t.?4
this.startIndex = 0; ; mo\ yW1
else{ Wd^F%)(
this.startIndex = indexes YjX!q]56
; $ ?jR
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[startIndex / pageSize]; V.
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} !UgUXN*
} !CVBG*E^l
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publicint getNextIndex(){ C+L_61
int nextIndex = getStartIndex() + }Pm(oR'KTJ
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pageSize; Ddm76LS
if(nextIndex >= totalCount) @F3-Ugm
return getStartIndex(); Qa7S'(
else cyHak u+
return nextIndex; WFeMr%Zqh>
} z[|PsC3i:
|0%4Gk);
publicint getPreviousIndex(){ $!l2=^\3
int previousIndex = getStartIndex() - eUKl
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pageSize; OnPy8mC
if(previousIndex < 0) u7Y'3x,`
return0; Io4:$w
else /|u]Y/ *
return previousIndex; }x#P<d(
} wc+N
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} nnd-pf-
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抽象业务类 X!+Mgh6
java代码: 5%Fn^u:
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/** 6JFDRsX>)?
* Created on 2005-7-12 N>}K+M>
*/ {OhkuON
package com.javaeye.common.business; YqY6\mo
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import java.io.Serializable; "!6 B5Oz
import java.util.List; ^/d^$
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import org.hibernate.Criteria;
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import org.hibernate.HibernateException; ad$Qs3)6o
import org.hibernate.Session; P15* VPy
import org.hibernate.criterion.DetachedCriteria; *liPJ29C[
import org.hibernate.criterion.Projections; 0h@%q;g
import :5cu,&<Gv
@X6#$ex
org.springframework.orm.hibernate3.HibernateCallback; \(>$mtS:
import F;X q:e8
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org.springframework.orm.hibernate3.support.HibernateDaoS ~oW8GQ
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upport; :D+SY
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import com.javaeye.common.util.PaginationSupport; nog\,NT
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public abstract class AbstractManager extends + $a:X
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HibernateDaoSupport { HlL@{<
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privateboolean cacheQueries = false; @xF8' [<
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privateString queryCacheRegion; -R$FJbId
ah Xq{>
publicvoid setCacheQueries(boolean ][5p.owJse
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cacheQueries){ ?jn6Op
this.cacheQueries = cacheQueries; g1*H|nh2
} ;=9vmQA
XX[Wwt
publicvoid setQueryCacheRegion(String WJSHLy<a
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queryCacheRegion){ $9_.Q/9>
this.queryCacheRegion = oJ@PJvmR&a
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queryCacheRegion; 8Y0<lfG
} IV)W|/.
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publicvoid save(finalObject entity){ MqBATW.pmJ
getHibernateTemplate().save(entity); 0l1]QD+Gc5
} :*Ggz|
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publicvoid persist(finalObject entity){ 5WJkeG ba
getHibernateTemplate().save(entity); :kx#];2i
} 4b(irDT3F
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publicvoid update(finalObject entity){ zT-"kK
getHibernateTemplate().update(entity); -Lf6]5$2'
} iM/0Yp-v'>
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publicvoid delete(finalObject entity){ hic$13KuP
getHibernateTemplate().delete(entity); ^%X\ }><
} 8(f0|@x^
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publicObject load(finalClass entity, 'MQGR@*
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finalSerializable id){ z%dlajYm:
return getHibernateTemplate().load U?^|>cMr
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(entity, id); |ShRxE3@'
} PZhZK
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publicObject get(finalClass entity, {uM{5GSL
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finalSerializable id){ 3cFLU^
return getHibernateTemplate().get %+!9
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(entity, id); ulSTR f
} h%^kA@3F
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publicList findAll(finalClass entity){ 3L]^x9Cu)
return getHibernateTemplate().find("from RH4n0=2
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" + entity.getName()); U(]5U^
} ,$qs9b~
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publicList findByNamedQuery(finalString <({eOh5N
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namedQuery){ %1 ^jd\
return getHibernateTemplate fvM3.P
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().findByNamedQuery(namedQuery); * !Y3N<>!
} ,k! f`
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publicList findByNamedQuery(finalString query, yaYt/?|
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finalObject parameter){ Iw|[*Nu-
return getHibernateTemplate ;k%sKVP
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().findByNamedQuery(query, parameter); I^Jp
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} GXK?7S0H
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publicList findByNamedQuery(finalString query, ye7&y4v+
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finalObject[] parameters){ nJ})6/gK
return getHibernateTemplate j2qfEvU
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().findByNamedQuery(query, parameters); 9k^=m)yS'
} D"f(nVEr
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publicList find(finalString query){ VEEeQy
return getHibernateTemplate().find {-`OE
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(query); qTMz6D!Q
} ujqktrhuLb
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publicList find(finalString query, finalObject Qu\l$/
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parameter){ :Qp/3(g e
return getHibernateTemplate().find 3A}8?
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(query, parameter); FN`kSTm*0!
} <sB45sNbU`
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public PaginationSupport findPageByCriteria &.4_4"l(
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(final DetachedCriteria detachedCriteria){ O~0
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return findPageByCriteria #p`7gFl
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 0U*"OSpF
} O~OWRJ@p
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public PaginationSupport findPageByCriteria @BhAFv,7
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(final DetachedCriteria detachedCriteria, finalint 9cj-v}5j
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startIndex){ F|Ihq^q
return findPageByCriteria ZSt
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(detachedCriteria, PaginationSupport.PAGESIZE, v>!}cB/6
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startIndex); /n7,B}
} E8<i PTJs
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public PaginationSupport findPageByCriteria I>Yp=R
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(final DetachedCriteria detachedCriteria, finalint {[~,q\M[
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pageSize, N<(`+?
finalint startIndex){ Y,\mrW}K
return(PaginationSupport) BniVZCct
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getHibernateTemplate().execute(new HibernateCallback(){ io3'h:+9s
publicObject doInHibernate K(<P" g(
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(Session session)throws HibernateException { p<19 Jw<
Criteria criteria = JCfToFB
dS=,. }
detachedCriteria.getExecutableCriteria(session); |c/rHEZ
int totalCount =
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((Integer) criteria.setProjection(Projections.rowCount *60)Vo.=
".<p R}
qp
()).uniqueResult()).intValue(); e'&{KD,-T
criteria.setProjection I
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(null); BZshTP[`
List items = j=S"KVp9NF
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criteria.setFirstResult(startIndex).setMaxResults .utL/1Ej
)^sfEYoA
(pageSize).list(); \ y",Qq?
PaginationSupport ps = oP
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new PaginationSupport(items, totalCount, pageSize, HI 61rXNF
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startIndex); V'/%)oU\"
return ps; \0*LfVr;P
} a$:N9&P
}, true); V= PoQ9d
} ^]gl#&"D
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public List findAllByCriteria(final #JucOWxjY
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DetachedCriteria detachedCriteria){ gHshG;z*
return(List) getHibernateTemplate {Aw3Itef
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().execute(new HibernateCallback(){ \_bX2Lg
publicObject doInHibernate 32D/%dHC
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(Session session)throws HibernateException { 6si-IJ
Criteria criteria = r
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detachedCriteria.getExecutableCriteria(session); pE,BE%
return criteria.list(); PX)qA=4q
} _P1-d`b0 a
}, true); ApB0)N
} Cx~z^YP'
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public int getCountByCriteria(final xpwzz O*U
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DetachedCriteria detachedCriteria){ W0kq>s4
Integer count = (Integer) xW~@V)OH
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getHibernateTemplate().execute(new HibernateCallback(){ ;7>--_?=
publicObject doInHibernate S(l^TF
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(Session session)throws HibernateException { \-y i#N
Criteria criteria = 6I0MJpLW
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detachedCriteria.getExecutableCriteria(session); (eP)>G]
return t:7jlD!d
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criteria.setProjection(Projections.rowCount owhht98y(
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()).uniqueResult(); gEu\X|7'
} \O~7X0 <W
}, true); _P:P5H8
return count.intValue(); *p^MAk9=
} |t_2AV
} 3RUB2c4
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用户在web层构造查询条件detachedCriteria,和可选的 Op{Mc$5a
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 j;.&+.
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PaginationSupport的实例ps。 )Be;Zw.|
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ps.getItems()得到已分页好的结果集 ):@B1 yR
ps.getIndexes()得到分页索引的数组 QR)eJ5<
ps.getTotalCount()得到总结果数 -(EqBr@_
ps.getStartIndex()当前分页索引 :JYOC+#q7
ps.getNextIndex()下一页索引 ] W_T(C*
ps.getPreviousIndex()上一页索引 OHw6#N$\
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 1Rh&04O>VL
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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 \!3='~2:=o
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一下代码重构了。 LmE-&
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我把原本我的做法也提供出来供大家讨论吧: p:jrqjLp
mfvQ]tz_+
首先,为了实现分页查询,我封装了一个Page类: x@=7M'vr%
java代码: ~cjvo?)&e;
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/*Created on 2005-4-14*/ eMwf'*#
package org.flyware.util.page; r[x7?cXsW
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/** X)~-MY*p
* @author Joa iu 'yB
* JY,+eD
*/ 4/4IZfznX
publicclass Page { I}X8-WFB
u(R`}C?P'
/** imply if the page has previous page */ *))|ZE6jI
privateboolean hasPrePage; M<nn+vy`
~xCy(dL^}
/** imply if the page has next page */ Sa0\93oa
privateboolean hasNextPage; 0Ju{6x(|
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/** the number of every page */ Evc
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privateint everyPage; ! [X<>
X {$gdz8S9
/** the total page number */ 1X5\VY>S`h
privateint totalPage; ;k0*@c*
fOJyY[
/** the number of current page */ OX"`VE
privateint currentPage; R+\5hI@ >i
};*5+XY^
/** the begin index of the records by the current
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query */ \3l;PY
privateint beginIndex; ZD/!C9:&.0
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/** The default constructor */ >\'yj|
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public Page(){ ~BC5no
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} 8HzEH-J
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/** construct the page by everyPage ,RZktWW_
* @param everyPage
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* */ vv u((b
public Page(int everyPage){ S%4K-I
this.everyPage = everyPage; 8P .! q
} U;(&!Ei
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/** The whole constructor */ EQ28pAZ
public Page(boolean hasPrePage, boolean hasNextPage, bke 1 F
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int everyPage, int totalPage, Y4_i=}\*vf
int currentPage, int beginIndex){ 5XhV+t
g.
this.hasPrePage = hasPrePage; W `Soa&9
this.hasNextPage = hasNextPage; ZA!vxQ?P,
this.everyPage = everyPage; Q~9:}_@
this.totalPage = totalPage; v1}
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this.currentPage = currentPage; _]\mh,}
this.beginIndex = beginIndex; ,=mn*
} 43eGfp'
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/** |89`O^
* @return sJ,zB[e8
* Returns the beginIndex. Gqs8$[o
*/ hi37p1t
publicint getBeginIndex(){ cIgF]My*D@
return beginIndex; 1G\ugLm
} yY1&hop
sB6UlX;b:
/** .(sT?M`\J
* @param beginIndex (i`DUF'#y
* The beginIndex to set. {f!m m3'2v
*/ mBNa;6w?{*
publicvoid setBeginIndex(int beginIndex){ 3y@'p(}Az
this.beginIndex = beginIndex; )b
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} A`@we
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/** 9+L!
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* @return Q/< $ (Y
* Returns the currentPage. )P$
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*/ 3}H94H)]a
publicint getCurrentPage(){ !u^(<.xJ
return currentPage; k8h$#@^
} ? 0%lB=qQ
39OZZaWL
/** *P_TG"^{W
* @param currentPage -X |G
* The currentPage to set. 43/|[
*/ x>t:&Y M
publicvoid setCurrentPage(int currentPage){ Y A;S'dxY
this.currentPage = currentPage; _uRgKoiy
} W4Eo1 E
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/** 6rRPqO
j
* @return jtZ@`io
* Returns the everyPage. 40Du*5M
*/ ?-(E$ll
publicint getEveryPage(){ T-27E$0
return everyPage; @]A4{
} {&/q\UQ
4b 4nFRnH
/** a/?gp>M9
* @param everyPage <uA|nYpp
* The everyPage to set. Z!#zr@'k
*/ d/;oNC+
publicvoid setEveryPage(int everyPage){ 7Npz
{C{I
this.everyPage = everyPage; 39u!j|VH
} u tQ_!3u
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/** QtRKmry{
* @return TIS}'c'C
* Returns the hasNextPage. w{0UA6 +
*/ ;VvqKyUh7`
publicboolean getHasNextPage(){ H*l8,*M}
return hasNextPage; /9[nogP
} eX}uZR
VDscZt)y8
/** T9u/|OP
* @param hasNextPage B=9|g1e
* The hasNextPage to set. |vzGFfRI
*/ h8n J$jg
publicvoid setHasNextPage(boolean hasNextPage){ ?+51 B-
this.hasNextPage = hasNextPage; YncY_Hu
} bj7v <G|Y
>V NMQ
/** xGz$M@f
* @return R,tR{| 8
* Returns the hasPrePage. /\2 s%b*
*/ 3C.bzw^
publicboolean getHasPrePage(){ oZ!rK/qoA
return hasPrePage; ]F-{)j
} 7:;P>sF@
Pg5 1}{
/** m%m8002
* @param hasPrePage H]YPMG<
* The hasPrePage to set. ]{dg"J
*/ "Sl";.
publicvoid setHasPrePage(boolean hasPrePage){ 3 bGpK9M~
this.hasPrePage = hasPrePage; 2c}>}A 4
} MA"DP7e?v
M7En%sBp
/** 7Sr7a{
* @return Returns the totalPage. RzNv|
* {V8v
*/ ~GMlnA]6
publicint getTotalPage(){ !K_%@|: 7%
return totalPage; >`u} G1T\
} MLaH("aen
q
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/** N-;e"
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* @param totalPage l9# v r
* The totalPage to set. jiz"`,-},O
*/ 8{@#N:SY
publicvoid setTotalPage(int totalPage){ NfKi,^O
this.totalPage = totalPage; r\a9<nZ{
} wn5CaP(]8
->:G+<
} 2{g~6U.
Hb IRE
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 H<g-
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个PageUtil,负责对Page对象进行构造: K@`F*^A}V
java代码: |5`z;u7V
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/*Created on 2005-4-14*/ 7>v1w:cC]
package org.flyware.util.page; -bduB@#2d
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import org.apache.commons.logging.Log; #%Uk}5;-
import org.apache.commons.logging.LogFactory; !3}vl
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/** pzH N:9r
* @author Joa U!TFFkX[
* ]xbR:CYJ
*/ 4Rp2
publicclass PageUtil { h@t&n@8O?
u\.7#D>
privatestaticfinal Log logger = LogFactory.getLog K6{{\r
WTZP}p1
(PageUtil.class); j;)U5X
do C8!
/** >kd&>)9v
* Use the origin page to create a new page R"VmN2
* @param page H5{d;L1[
* @param totalRecords SX$v&L<
* @return S~/zBFo-
*/ ZFY t[:
publicstatic Page createPage(Page page, int .{*V^[.
;}ileLTl
totalRecords){ G(EiDo&
return createPage(page.getEveryPage(), SZea[~&
1|Us"GQ(n
page.getCurrentPage(), totalRecords); &AG,]#
} e@F9'z4
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/** 7lqj" o(
* the basic page utils not including exception ;*[nZV>
1Y_Cd
handler -tlRe12
* @param everyPage KAT4C 4=,
* @param currentPage 7kp$C?7K
* @param totalRecords XL1v&'HLV
* @return page E?m(&O
j
*/ ~8o's`
publicstatic Page createPage(int everyPage, int jqhd<w
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currentPage, int totalRecords){ ,nD:W
everyPage = getEveryPage(everyPage); @YHB>rNf(7
currentPage = getCurrentPage(currentPage); !Y8us"
int beginIndex = getBeginIndex(everyPage, Uo#%f+t
MD%_Z/NL
currentPage); t-)C0<
int totalPage = getTotalPage(everyPage, 4N|^Joi
uhz:G~x!
totalRecords); b)tvXiO1>
boolean hasNextPage = hasNextPage(currentPage, y'(l]F1]
PF+v[h;,
totalPage); |$`)d87,
boolean hasPrePage = hasPrePage(currentPage); l\vtz5L
Py3Xvudv
returnnew Page(hasPrePage, hasNextPage, A]id*RtY
everyPage, totalPage, *tC]Z&5
currentPage, &.,ZU\`zT
Y9F!HM-`
beginIndex); KWq7M8mq
} K3Zc>QL{
4W
&HUQ?^
privatestaticint getEveryPage(int everyPage){ eQbDs_
return everyPage == 0 ? 10 : everyPage; q90eB6G0g
} Mhc!v, D$
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privatestaticint getCurrentPage(int currentPage){ QqA~y$'ut
return currentPage == 0 ? 1 : currentPage; T0J"Wr>WY
} M.iR5Uh
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privatestaticint getBeginIndex(int everyPage, int dlsVE~_G
E5(\/;[*`
currentPage){ q{gt2OWqX
return(currentPage - 1) * everyPage; 9=p^E# d
} })rJU/
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privatestaticint getTotalPage(int everyPage, int [4KW64%l
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totalRecords){ tt2`N3Eu\
int totalPage = 0; { K'QE0'x
xL,Lb}){%
if(totalRecords % everyPage == 0) ^R',P(@oL
totalPage = totalRecords / everyPage; -]\cUQ0
else (\}>+qS[
totalPage = totalRecords / everyPage + 1 ; x2(!r3a
.>NhC"
return totalPage; Yj99[
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} z;yb;),
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privatestaticboolean hasPrePage(int currentPage){ (=cR;\s<
return currentPage == 1 ? false : true; +`O8cHx
} :oh(M|;/2
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privatestaticboolean hasNextPage(int currentPage, BQq,,i8H
bU9B2'%E
int totalPage){ ;gfY_MXnF
return currentPage == totalPage || totalPage == JDrh-6Zgj
Ch8w_Jf1yx
0 ? false : true; /*\pm!]._^
} , v,mBYaU
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} %y;E1pva
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/if
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。 *vqlY[2Ax
`oQ)qa_
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 V~ph1Boz2
@| kBc.(]
做法如下: $Ay
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1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 \lwYDPY:
x-O9|%aRJ
的信息,和一个结果集List: :a3 +f5
java代码: ckFnQhW
R
r7 r5
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/*Created on 2005-6-13*/ wmbjL=f
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package com.adt.bo; yDh(4w-~gk
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import java.util.List; \-3\lZ3qj
V9qZa
import org.flyware.util.page.Page; )2t!=
ua
foY=?mbL
/** c^0YuBps[
* @author Joa gn"Y?IZ?
*/ {?tK]g#
publicclass Result { 9i4!^DM_
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private Page page; ?0k(wiF
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+{Spm
private List content; <j" }EEb^
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/** Esh3cn4
* The default constructor $OOZ-+8
*/ ]l\'1-/
public Result(){ 5y]1v
super(); o|#Mq"od
} y+D 3(Bsn
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/** Omy4Rkj8bh
* The constructor using fields b=[gK|fu
* ;4XvlcGo
* @param page Bc%A aZ0x
* @param content e45gjjts
*/ -WiOs;2~/
public Result(Page page, List content){ YNV!(>\GE
this.page = page; py#`
this.content = content; nd)Z0%xo
} h!# (. P
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/** #D8Z~U,-
* @return Returns the content. E#3KWp#M
*/ ]iu}5]?)
publicList getContent(){ +oKp>-
return content; Fe8JsB-
} l(X8 cHAi
BxR%\
/** z"/Mva3|
* @return Returns the page. 4u}"ng
*/ |GPR3%9
public Page getPage(){ 27mGX\T
return page; !O=?n<Ex"
} =@%;6`AVcp
I,4t;4;Zk
/** 1~BDtHW7`n
* @param content jIY
* The content to set. V=yRE
*/ ::13$g=T9s
public void setContent(List content){ 2kg<O%KA`c
this.content = content; :|hFpLt
} +B^(,qKMN
]L0GIVIE
/** @oC# k<
* @param page }6/L5j:+
* The page to set. ?v-Y1j
*/ jG($:>3a@
publicvoid setPage(Page page){ 5f+ziiZ
this.page = page; GA&mM