Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 IW Ro$Yu
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 3hN.`G-E
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 nDt1oM
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 }ZP;kM$g
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。 3bCb_Y
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分页支持类: @W{VT7w
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java代码: "s:eH"_s
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package com.javaeye.common.util; Rh=,]Y
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import java.util.List; Y?1
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publicclass PaginationSupport { jbDap i<
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publicfinalstaticint PAGESIZE = 30; 51,RbADB
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privateint pageSize = PAGESIZE; =V)88@W
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privateList items; M9_G
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privateint totalCount; 7W{xK'|]
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privateint[] indexes = newint[0]; Aqc
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privateint startIndex = 0; lur$?_gt
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public PaginationSupport(List items, int #_A <C+[
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totalCount){ lphELPh
setPageSize(PAGESIZE); u$3wdZ2&m
setTotalCount(totalCount); 6m=FWw3y
setItems(items); 6:(R/9!P
setStartIndex(0); \[nvdvJv
} |=dmxfj@
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public PaginationSupport(List items, int ( %i)A$i6a
c
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totalCount, int startIndex){ yMJY6$Ct
setPageSize(PAGESIZE); k|ol+
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setTotalCount(totalCount); R(i2TAaaU
setItems(items); )ZyEn%
setStartIndex(startIndex); w6B'&
} e:h(,
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public PaginationSupport(List items, int j.'Rm%@u
h1y6`m9
totalCount, int pageSize, int startIndex){ L\:f#b~W
setPageSize(pageSize); SGZ]_
setTotalCount(totalCount); fs43\m4=m
setItems(items); r35'U#VMk?
setStartIndex(startIndex); ~miRnW*x
} o(2tRDT\_b
P ~pC /z
publicList getItems(){ &ye,A(4
return items; 7]i=eD8
} X_j=u1*5
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publicvoid setItems(List items){ x6d0yJ <
this.items = items; oAMB}a;
} @V9qbr=Z
TQcEe@$)
publicint getPageSize(){ M~6x&|2
return pageSize; /c`s$h4-
} Cb{n4xKW6
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publicvoid setPageSize(int pageSize){ SM<kR1bo
this.pageSize = pageSize; qtx5N)J6
} C< :F<[H
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publicint getTotalCount(){ RWN2P6
return totalCount; R)%1GG4
} yf2I%\p}
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publicvoid setTotalCount(int totalCount){ 6X@]<R
if(totalCount > 0){ R^fk :3
this.totalCount = totalCount; AADvk_R
int count = totalCount / [lSQ?
;[)t*yAh
pageSize; liYR8 D
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if(totalCount % pageSize > 0) ^G(/;c*=
count++; Gk.;<d
indexes = newint[count]; ?89ZnH2/
for(int i = 0; i < count; i++){ vYYLn9}5
indexes = pageSize * 1pUIZ$@?`
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i;
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} ~7N>tjB
}else{ \~1>%F'op
this.totalCount = 0; CoZXbTq
} w|"cf{$^x
} AYC22(
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publicint[] getIndexes(){
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return indexes; v7"Hvp3w
} 64#6L.Q-c
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publicvoid setIndexes(int[] indexes){ W|go*+`W%
this.indexes = indexes; 2n9E:tc
} HuX{8nl a
q{rc[ s?
publicint getStartIndex(){ ~MvLrg"i
return startIndex; W6Os|z9&|
} G8JwY\
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publicvoid setStartIndex(int startIndex){ ''@upZBJ
if(totalCount <= 0) 8a\
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this.startIndex = 0; [5v[Zqud
elseif(startIndex >= totalCount) VW7
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this.startIndex = indexes )/'y'd<r
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[indexes.length - 1]; (Ea)`'/
elseif(startIndex < 0) (z[|\6O
this.startIndex = 0; wYf9&}k\4
else{ ++s=$D
this.startIndex = indexes Wcgy:4K3
([-xM%BI6
[startIndex / pageSize]; Lv;R8^n
} ` "Gd/
} uW.)(l
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publicint getNextIndex(){ G(alM=q
int nextIndex = getStartIndex() + u-CC UMR
;2m<#~@0
pageSize; 0A~zuK
if(nextIndex >= totalCount) EW* 's(
return getStartIndex(); PV2cZ/
else jLULf+8&
return nextIndex; :Sh>
} iU5Aj:U3
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publicint getPreviousIndex(){ UuV<#N)
int previousIndex = getStartIndex() - %"R|tlG
u&iMY3=
pageSize; =R M=@X
if(previousIndex < 0) htn "rY(
return0; sA3=x7j%c
else uT5sLpA|6
return previousIndex; UMg*Yv%
} t~xp&LQiY
[:HT=LX3
} ]-o0HY2
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抽象业务类 q@;z((45
java代码: ''9FB5
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/** J?ljqA}i
* Created on 2005-7-12 ]jUxL=]r
*/ LL~bq(b
package com.javaeye.common.business; w[>/(R7im
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import java.io.Serializable; cLN(yL
import java.util.List; 0@R @L}m
@"*8nV#
import org.hibernate.Criteria; x(e=@/qp
import org.hibernate.HibernateException; D`;Q?fC
import org.hibernate.Session; l
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import org.hibernate.criterion.DetachedCriteria; c}nXMA^^
import org.hibernate.criterion.Projections; L0_qHLY
import OUY65K
c\.8hd=<
org.springframework.orm.hibernate3.HibernateCallback; mdu5aL
import mVYLI!n}0#
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org.springframework.orm.hibernate3.support.HibernateDaoS t]Ey~-Rx
&j@i>(7
upport;
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import com.javaeye.common.util.PaginationSupport; b"+J8W
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public abstract class AbstractManager extends \R>!HY
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HibernateDaoSupport { gxpGi@5
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privateboolean cacheQueries = false; 3|/<Pk
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privateString queryCacheRegion; `P&L. m]|
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publicvoid setCacheQueries(boolean sR`WV6!9
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cacheQueries){ p[*NekE6-
this.cacheQueries = cacheQueries; ~]71(u2
} o=`FGowF
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publicvoid setQueryCacheRegion(String X<4h"W6
gi;#?gps
queryCacheRegion){ j HT2|VGb*
this.queryCacheRegion = neGCMKtzlJ
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queryCacheRegion; VWoxi$3v
} I|=$.i
x\vb@!BZ
publicvoid save(finalObject entity){ LPgP;%ohO/
getHibernateTemplate().save(entity); {`0GAW)q
} Ly?yWS-x
o@}+b}R}
publicvoid persist(finalObject entity){ q9j9"M'
getHibernateTemplate().save(entity); )-FQ_K%
} A&i
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publicvoid update(finalObject entity){ hB#z8D
getHibernateTemplate().update(entity); Z6<vLc
} {0fQ"))"
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publicvoid delete(finalObject entity){ 0zg\thL
getHibernateTemplate().delete(entity); '|r('CIBN/
} 28L3"c
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publicObject load(finalClass entity, gIR{!'
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finalSerializable id){ ~%9ofXy
return getHibernateTemplate().load #NM.g
#`6A}/@.+
(entity, id); h<oQ9zW)
} EQ&E C
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publicObject get(finalClass entity, 1MdVWFKXV
\*#9Ry^f
finalSerializable id){ QE7
r{
return getHibernateTemplate().get ,4ftQJ
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(entity, id); W! FmC$Kc
} iYj+NL
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publicList findAll(finalClass entity){ `,
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return getHibernateTemplate().find("from 2U6j?MyH2
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" + entity.getName()); 6KmF 9
} K ;2tY+I
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publicList findByNamedQuery(finalString 4*9y4"
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namedQuery){ G0Wzx)3]
return getHibernateTemplate N1ZHaZ
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().findByNamedQuery(namedQuery); |y@TI
} I(E1ym
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publicList findByNamedQuery(finalString query, Ue|]M36
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finalObject parameter){ Au'[|Prr
return getHibernateTemplate Pg%OFhA
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().findByNamedQuery(query, parameter); DoA4#+RU
} vs|>U-Mpw~
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publicList findByNamedQuery(finalString query, H".~@,-}
=V:rO;qX+@
finalObject[] parameters){ 5Bw
return getHibernateTemplate (6p5Fo
j r6)K;:.
().findByNamedQuery(query, parameters); uQ#3;sFO
} !8]W"@qb
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publicList find(finalString query){ JpDc3^B*
return getHibernateTemplate().find 6vz9r)L
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(query); V ^=o@I
} fL4F
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publicList find(finalString query, finalObject "(ehf|%>%
}' `2C$
parameter){ 5:SfPAx
return getHibernateTemplate().find GE=#8-@g~p
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(query, parameter); S~`&K
} u79.`,Ad&
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public PaginationSupport findPageByCriteria /EhojODMF
pLL
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(final DetachedCriteria detachedCriteria){ Dq+rEt
return findPageByCriteria 67 >*AL
L's_lC
(detachedCriteria, PaginationSupport.PAGESIZE, 0); C^RO@kM
} $(_Xt- 6
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public PaginationSupport findPageByCriteria <1]#E@
T$13"?sr=
(final DetachedCriteria detachedCriteria, finalint '.oEyZA;o
f+Nq?GvwBQ
startIndex){ CDei+ q
return findPageByCriteria iUqL /
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(detachedCriteria, PaginationSupport.PAGESIZE, AEm?g$a
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startIndex); ZbCu -a{v
} DGdSu6s$
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public PaginationSupport findPageByCriteria zLuej'
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(final DetachedCriteria detachedCriteria, finalint ihKnZcI$i
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pageSize, NvXds;EC
finalint startIndex){ VN|P(S6
return(PaginationSupport) R<)7,i`F
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getHibernateTemplate().execute(new HibernateCallback(){ GWRKiTu9
publicObject doInHibernate 6w<jg/5t
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(Session session)throws HibernateException { % w 6fB
Criteria criteria = Ph2jj,K
Fsv%=E{
detachedCriteria.getExecutableCriteria(session); I(ds]E
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int totalCount = IX;u +B
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((Integer) criteria.setProjection(Projections.rowCount 9f;\fe
Q u2W
()).uniqueResult()).intValue(); QNzI
criteria.setProjection =dUeQ?>t=
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(null); |#$Wh+,*
List items = "zR+}
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criteria.setFirstResult(startIndex).setMaxResults fb4/LVg'J
e?3 S0}
(pageSize).list(); Rer\='
PaginationSupport ps = UyBI;k^]
W"YFx*W
new PaginationSupport(items, totalCount, pageSize, t.c XrX`k
zS 18Kl
startIndex); j*<H18^G
return ps; v7T05
} #rqLuqw
}, true); E"&fT!yi
} !6\{q
M
#-1 ;
public List findAllByCriteria(final N|?"=4Z?
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x
DetachedCriteria detachedCriteria){ BftW<1,U^
return(List) getHibernateTemplate 0J z'9
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().execute(new HibernateCallback(){ 6<.Ma7)lA
publicObject doInHibernate i[H`u,%+(
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(Session session)throws HibernateException { 8v\BW^z3
Criteria criteria = _/MHi-]/.
8-UlbO6
detachedCriteria.getExecutableCriteria(session); PYPs64kNC]
return criteria.list(); !]7Z),s
} Vq2d+
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}, true); >`Gys8T
} 3i=+ [
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public int getCountByCriteria(final m^@,0\F
c?"#x-<1s
DetachedCriteria detachedCriteria){ 5;oWFl
Integer count = (Integer)
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getHibernateTemplate().execute(new HibernateCallback(){ z{Z'2 ,#
publicObject doInHibernate 4*d$o=wa
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(Session session)throws HibernateException { rR&; 2
Criteria criteria = 03L+[F&"?
.Ebg>j:\
detachedCriteria.getExecutableCriteria(session); AK%`EsI^
return l_5]~N
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criteria.setProjection(Projections.rowCount 8-3]Bm!
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()).uniqueResult(); iyAeR!`
} 9'faH
}, true); @v\Osp t=
return count.intValue(); `WGT`A"
} x
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} ,<0R'R
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用户在web层构造查询条件detachedCriteria,和可选的 P!3)-apP\
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v!
startIndex,调用业务bean的相应findByCriteria方法,返回一个 DKnjmZ:J|
_TY9!:&}q
PaginationSupport的实例ps。 {DJ!T
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ps.getItems()得到已分页好的结果集 S\b[Bq
ps.getIndexes()得到分页索引的数组 X|fl_4NC>
ps.getTotalCount()得到总结果数 K?o( zh;
ps.getStartIndex()当前分页索引 rrbD0UzFA
ps.getNextIndex()下一页索引 pyYm<dn
ps.getPreviousIndex()上一页索引 | s%--W
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 y:u7*%"
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 k=!lPIx
s:ig;zb
一下代码重构了。 ~Gm<F .(+
+A%|.;
我把原本我的做法也提供出来供大家讨论吧: 15dhr]8E
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首先,为了实现分页查询,我封装了一个Page类: 'Dw+k;RH
java代码: F|pM$Kd`
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/*Created on 2005-4-14*/ @i2"+_}*
package org.flyware.util.page; /iURP-rl
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/** V&)Jvx}^
* @author Joa p_%dH
* -E{D'X
*/ 1oU/gm$7\q
publicclass Page { 0%J0.USkM7
9/2VU<
K
/** imply if the page has previous page */ AB(WK9o
privateboolean hasPrePage; =2v/f_
z7TMg^9#
/** imply if the page has next page */ Io_bS+
privateboolean hasNextPage; hK^(Y
z5.Uv/n\1
/** the number of every page */ v2eLH:6
privateint everyPage; :jL>sGvBv
"?9rJx$
/** the total page number */ ;B*im
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privateint totalPage; wT\JA4
'kBg3E$y
/** the number of current page */ A1>fNilC9
privateint currentPage; wr);+.T9R
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/** the begin index of the records by the current y
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EZs"?A
query */ zI-]K,!
privateint beginIndex; >_XC
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jP
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/** The default constructor */ RTC;Wj
public Page(){ <c'0-=
.cks){\
} `>ppDQaS)W
H!SFSgAu
/** construct the page by everyPage - t#YL
* @param everyPage *G rYB6MT
* */ V[DiN~H
public Page(int everyPage){ B|WM;Y^
this.everyPage = everyPage; d{/#A%.
} !ZxK+Xqx[
M02U,!di
/** The whole constructor */ Q Ev7k
public Page(boolean hasPrePage, boolean hasNextPage, $'*q]]
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int everyPage, int totalPage, `:b*#@
int currentPage, int beginIndex){ vJ,r}$H3
this.hasPrePage = hasPrePage; I<+EXH%1,
this.hasNextPage = hasNextPage; lKdd3W"o
this.everyPage = everyPage; WwDd62g
this.totalPage = totalPage; @T.+:U@S
this.currentPage = currentPage; J2ZV\8t
this.beginIndex = beginIndex; ohU}ST:9
} '`s+e#rs4{
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/** Rf4}((y7Y\
* @return gN@|lHbU
* Returns the beginIndex. k~%j"%OB
*/
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publicint getBeginIndex(){ {,+{,Ere
return beginIndex; bZ0{wpeK=
} C))x#P36
;_X2E~i[
/** sHqa(ynK
* @param beginIndex ;F_pF+&q
* The beginIndex to set. =\`iC6xP}
*/ /@ww"dmqU
publicvoid setBeginIndex(int beginIndex){ y5{Vx{V"Q
this.beginIndex = beginIndex; m?O~(6k@C
} J?C#'2/
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/** fI
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* @return Ce/l[v
* Returns the currentPage. 8bJj3vr
*/ %*
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publicint getCurrentPage(){ H\fsyxM7
return currentPage; +'|nsIx,
} Sx8RH),k
@{>0v"@
/** pC~M5(F_
* @param currentPage 5>6:#.f%!e
* The currentPage to set. fc&djd`FuX
*/ d{J@A;da
publicvoid setCurrentPage(int currentPage){ m'zve%G
this.currentPage = currentPage; [XE\2Qa8e
} ;kzjx%h
nIr:a|}[
/** =Y- .=}jp;
* @return 5OCt Q4u
* Returns the everyPage. $b~[>S-Q
*/ 2@N9Zk{{J
publicint getEveryPage(){ ZsNZ3;d@u(
return everyPage; ZEK,Z['
} OO2uE ;( 3
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/** n$ rgJ
* @param everyPage Xub*i^(]
* The everyPage to set. b:5-0uxjs
*/ GT7&>}FJ)
publicvoid setEveryPage(int everyPage){ &\=Tm~
this.everyPage = everyPage; U8.V Rn
} 7`j%5%q
%M3L<2
/** ODEFs?%'
* @return ~&aULY?)]
* Returns the hasNextPage. 7gcR/HNeF
*/ = GyABK
publicboolean getHasNextPage(){ &]h`kvtBC
return hasNextPage;
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} YkFAu8b>
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/** jlA6~n
* @param hasNextPage -2[#1S*
* The hasNextPage to set. eEBo:Rc9
*/ ~N%+ZXh&E
publicvoid setHasNextPage(boolean hasNextPage){ r+d+gO.
this.hasNextPage = hasNextPage; A`#?Bj
} eBH:_Ls_-^
dF[|9%)
/** hF{gN3v5
* @return ^RJ@9`P&t
* Returns the hasPrePage. * RyU*au
*/ +_L]d6
publicboolean getHasPrePage(){ OwT _W)$
return hasPrePage; A=0{}B#
} Y7zs)W8xTT
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/** A%2B3@1'q
* @param hasPrePage HC}vO0X4
* The hasPrePage to set. \HIBnkj)3n
*/ 1c{m
rsB
publicvoid setHasPrePage(boolean hasPrePage){ }N}Js*
this.hasPrePage = hasPrePage; 2-DG6\QX|
} U)xebU.!S
}hsNsQ
/** nU' qE
* @return Returns the totalPage. DS;\24>H
* et/:vLl13
*/ <(@Z#%O9)
publicint getTotalPage(){ i\_LLXc
return totalPage; Dw/vXyZ
} kia[d984w
rFGPS%STS
/** k33\;9@k
* @param totalPage Zf1
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* The totalPage to set. *;)O'|
*/ 3"zPG~fY{
publicvoid setTotalPage(int totalPage){ 2{.g7bO
this.totalPage = totalPage; Yj'9|4%+|
} I-}ms
U3C"o|
} QJj='+R>
G pI4QzR
4 ob?M:S
"P0!cY8r
}S8aR:'
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 B$6KI
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个PageUtil,负责对Page对象进行构造: D+v?zQw
java代码: 8R%<~fq r
SswcO9JCX3
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/*Created on 2005-4-14*/ Xy%||\P{)
package org.flyware.util.page; {Ef.wlZ
ii_kgqT^
import org.apache.commons.logging.Log; }LCm_av
import org.apache.commons.logging.LogFactory; <T?-A}0uO
8^^ 1h
/** !(7m/R
* @author Joa =}%#j0a4
* Q
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*/ >SLQW
publicclass PageUtil { p5$}h,7
&9^4-5]
privatestaticfinal Log logger = LogFactory.getLog
+WAkBE/
@"`}%-b
(PageUtil.class); c+&Kq.~K
9DJ&J{2W
/** zt:
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* Use the origin page to create a new page ZT@=d$Z&t
* @param page ?IYu"UO<)|
* @param totalRecords zzhZ1;\
* @return E&
.^|<n
*/ D
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publicstatic Page createPage(Page page, int }3A~ek#*~
y~\ujp_5w
totalRecords){ U+qyS|i
return createPage(page.getEveryPage(), {ibu0
vRH^en
page.getCurrentPage(), totalRecords); r}&&e BY
f
} FJDC^@ Ne
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/** Mib.,J~
* the basic page utils not including exception iphC\*F
[:.wCG5
handler
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* @param everyPage @]%eL
* @param currentPage 5"@>>"3U
* @param totalRecords {Y@shf;
* @return page ~9 .=t '
*/ 7tXy3-~biz
publicstatic Page createPage(int everyPage, int jQ;/=9
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currentPage, int totalRecords){ w")
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everyPage = getEveryPage(everyPage); )-_^vB
currentPage = getCurrentPage(currentPage); ~;3#MAG
int beginIndex = getBeginIndex(everyPage, +Ps.HW#NY
WI4<2u;
currentPage);
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int totalPage = getTotalPage(everyPage, m{Vd3{H40
",3v%$>
totalRecords); I{OizBom
boolean hasNextPage = hasNextPage(currentPage, beBG40
kW)3naUf<
totalPage); }ofb]_C,
boolean hasPrePage = hasPrePage(currentPage); g}v](Q
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returnnew Page(hasPrePage, hasNextPage, o[cOL^Xd1
everyPage, totalPage, La )M
currentPage, T8a' 6otc
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beginIndex); &'$Bk5 D@G
} $uHQl#!;
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privatestaticint getEveryPage(int everyPage){ >Xk42zvqn
return everyPage == 0 ? 10 : everyPage; R|8vdZ%@
} 6&os`!
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privatestaticint getCurrentPage(int currentPage){ m;~} }~&vQ
return currentPage == 0 ? 1 : currentPage; GMJ4v S
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privatestaticint getBeginIndex(int everyPage, int WVRIq'
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currentPage){ VKl,m ;&