Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 >\ZR*CS
E:FO_R(Xq
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 8Y#bN*!
%w7m\nw@
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 ZW*n /#GUC
JvkL37^n:
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 u?kD)5Nk
!qA8Zky_
。 |z~LzSJv
&3Tx@XhO
分页支持类: NhA#bn9y?
noC?k }M
java代码: Wt J{
gLIT;BK
w>qCg XU3
package com.javaeye.common.util; G
AQ
'Ti1!
8.?E[~
import java.util.List; oEu>}JD
h>wcT VF
publicclass PaginationSupport { m"Qq{p|'
m"4B!S&Fc(
publicfinalstaticint PAGESIZE = 30; s*Ih_Ag=:
4<.O+hS
privateint pageSize = PAGESIZE; r~8;kcu7
DZe}y^F
privateList items; 8Bpip
.^[_V
privateint totalCount; .$Bwb/a
tWY2o3j
privateint[] indexes = newint[0]; o9Sn*p-.
1zjaR4Tf
privateint startIndex = 0; ioV_oR9I
<C<`J{X0
public PaginationSupport(List items, int iq6a|XGi
6z?gg3GV
totalCount){ ~O:
U|&
setPageSize(PAGESIZE); gi]ZG
setTotalCount(totalCount); EvE,Dm?h
setItems(items); WJ+>e+
setStartIndex(0); SMoz:J*Q(
} f-g1[!"F
X
\f[
public PaginationSupport(List items, int ([ dT!B#aH
EfiU$8y
totalCount, int startIndex){ \ZD[!w7
setPageSize(PAGESIZE); `HW:^T
setTotalCount(totalCount); \Hwg) Uc{
setItems(items); F98i*K`"
setStartIndex(startIndex); 1pP1d%
} `.=sTp2rbc
rg5]&<Vq8
public PaginationSupport(List items, int j'GtgT
jxw_*^w"
totalCount, int pageSize, int startIndex){ R8&|+ya
setPageSize(pageSize); <y)E>Fl
setTotalCount(totalCount); phP>3f.T
setItems(items); M3pjXc<O
setStartIndex(startIndex); f vLC_'M
} +a|/l
#Qbl=o4
publicList getItems(){ '#Dg8/r!
return items; {J]-<:XD
} PuXUuJx(
:Q@)*kQH
publicvoid setItems(List items){ aMK~1]Cx
this.items = items; },c,30V'
} u+D[_yd^
kWL.ewTiex
publicint getPageSize(){ 4;KWG}~[o
return pageSize; 0JY WrPR
} <7n]Ai@Y
1H{jy^sP 7
publicvoid setPageSize(int pageSize){ u3ZCT" !
this.pageSize = pageSize; DQJG,?e{
} &mE?y%
I^3:YVR&
publicint getTotalCount(){ &~-~5B|3"
return totalCount; 1S$h<RIPAc
} Vq ^]s$'
!gP0ndRJ=
publicvoid setTotalCount(int totalCount){ }/e`v6
if(totalCount > 0){ N4UM82N
this.totalCount = totalCount; 9z ?7{2C
int count = totalCount / ;(6P6@+o
*P2[qhP2
pageSize; ?KWj}|%
if(totalCount % pageSize > 0) *'R#4@wmP
count++; mlu 3K
indexes = newint[count]; ~
3T,&?r
for(int i = 0; i < count; i++){ &L4
q10-N
indexes = pageSize * 2 x4=
lKV"Mh+6
i; ULBg{e?l8
} )`HA::
}else{ 1u}nm;3
this.totalCount = 0; $Ui&D
I
} orIQ~pF#
} jo98
jA<
\u{8Bak0
publicint[] getIndexes(){ SEF6B45}1
return indexes; \#dl6:"
} Q M1F?F
+S~.c;EK
publicvoid setIndexes(int[] indexes){ {G*QY%j^
this.indexes = indexes; Mkv|TyC
} M{N(~ql
6Nh0
publicint getStartIndex(){ d^V$Z6*
]
return startIndex; i$UQbd
} HJhH-\{@
S>_27r{
publicvoid setStartIndex(int startIndex){ .~klG&>aV
if(totalCount <= 0) ;D2E_!N
dt
this.startIndex = 0; :q+N&j'3
elseif(startIndex >= totalCount) uS5o?fg\e
this.startIndex = indexes j9y3hQ+q
Fu _@!K
[indexes.length - 1]; #a9_~\s
elseif(startIndex < 0) |3eGz%Sd
this.startIndex = 0; OX hAha`R
else{ |)U|:F/{@
this.startIndex = indexes ;+Yi.Q/\
MagMZR
[startIndex / pageSize]; G?hK9@ |v
} g+[kde;(^
} kv?|'DN
-{g~TUz
publicint getNextIndex(){ 9$l>\.6
int nextIndex = getStartIndex() + ``QHG&$/
83iCL; GS=
pageSize; Utt>H@t[
if(nextIndex >= totalCount) E{Vo'!LY
return getStartIndex(); (#Mp 5C'X
else ;b%{ilx:
return nextIndex; A7-r<s
} K|^wc$
xtfRrX^
publicint getPreviousIndex(){ bEH
de*q(
int previousIndex = getStartIndex() - 8^yJqAXK
f7<pEGb
pageSize; .v`b[4M4
if(previousIndex < 0) e~\QE0Oe :
return0; "pvZ,l>8f
else mLwY]2T"
return previousIndex; $H2GbZ-I
} M}F~_S0h
}ot"Sx\.
} d@kc[WLD^
wNQqfqZ
G=d(*+&
B
5nLDj:C~
抽象业务类 `T WN^0!]
java代码: Dy9\O77>
:Jxh2
$\\lx_)
/** {aDFK;qG.
* Created on 2005-7-12 RA1yr+)
*/ x8N|($1
package com.javaeye.common.business; kU*{4G|6
grcbH
import java.io.Serializable; p2pAvlNoF
import java.util.List; JWHSnu!
\2!!L=&4G
import org.hibernate.Criteria; /oP^'""@je
import org.hibernate.HibernateException; :BZ0 7`9
import org.hibernate.Session; c{3rl;Cs
import org.hibernate.criterion.DetachedCriteria; ;+_8&wbqW
import org.hibernate.criterion.Projections; JdNF-64ky
import " 'tRfB
Nw<P
bklz
org.springframework.orm.hibernate3.HibernateCallback; SN">gmY+
import 9%DT0.D}$j
Np,2j KF(
org.springframework.orm.hibernate3.support.HibernateDaoS =,/D/v$m'2
xAdq+$><
upport; d>i13dAI
mN}7H:,
import com.javaeye.common.util.PaginationSupport; 6`e@$(dfA
Jh@_9/?
public abstract class AbstractManager extends g1[&c+=U`P
5vOC CW
HibernateDaoSupport { T0e<Slo~C
ST',4Oph5
privateboolean cacheQueries = false; Fwfo2
k*$3i
privateString queryCacheRegion; igkz2S I
M7dU@ Ag
publicvoid setCacheQueries(boolean z'MS#6|}
_6LoVS
cacheQueries){ -T_\f?V88
this.cacheQueries = cacheQueries; ~brFo2
} $:vkX
QZYU0;
VF
publicvoid setQueryCacheRegion(String )|]dmQ-
!{%G0(Dv
queryCacheRegion){ Vz:_mKA
this.queryCacheRegion = tk?UX7F
C7qYiSv
queryCacheRegion; 's%q
} CEtR[Cu
?y%t}C\W
publicvoid save(finalObject entity){ fE;Q:# Z.
getHibernateTemplate().save(entity); 8A2z 5Aa
} =!0I_L/
;#QhQx
publicvoid persist(finalObject entity){ <Oz66bTze
getHibernateTemplate().save(entity); W|R-J
} GESXc$E8
284zmZZ
publicvoid update(finalObject entity){ 96Zd M=
getHibernateTemplate().update(entity); <y=ovkM3
} PZOKrW
R}{GwbF_\
publicvoid delete(finalObject entity){ 8l)
getHibernateTemplate().delete(entity); kBsXfVs9
} nX5C<Ky
ef]B9J~h
publicObject load(finalClass entity, w6zBVi
'"xiS$b(
finalSerializable id){ 8;zDg$(
return getHibernateTemplate().load v '9m7$
AK/:I>M
(entity, id); |nxdB&1n
} |4>:M\h
"JhimgwvY
publicObject get(finalClass entity, F!g;A"?V
w~@[r4W
finalSerializable id){ ycpE=fso'
return getHibernateTemplate().get l4T:d^Eb
`wO}Hz
(entity, id); 7
.+al)hl
} v59nw]'
ZKdh%8C
publicList findAll(finalClass entity){ N}QFGX
return getHibernateTemplate().find("from T\sNtdF`:
t4K56H.L?
" + entity.getName()); C0m\SNR
} bkv/I{C>?
+zO]N&
publicList findByNamedQuery(finalString .Q\\dESn"
ZBM!MSf:
namedQuery){ 'mV:@].le
return getHibernateTemplate VifmZ;S@Y
MOHHZApt
().findByNamedQuery(namedQuery); ^.HWkS`e
} T.Zz;2I
=,:K)
publicList findByNamedQuery(finalString query, ,2zKQ2z
m&El)
finalObject parameter){ (!</%^ZI
return getHibernateTemplate +/N1_
}76.6=~
().findByNamedQuery(query, parameter); kk_zVrQ<
} 04JT@s"o
#7W.s!#}Dd
publicList findByNamedQuery(finalString query, 2d&^Sp&11
}$aNOf%:
finalObject[] parameters){ ;`j U_
return getHibernateTemplate p24.bLr
r{ @ `o@q
().findByNamedQuery(query, parameters); p":zrf'(6
} ^H=o3#P~L
hyu}}0:
publicList find(finalString query){ 4iBxPo(0
return getHibernateTemplate().find UrK"u{G
e,Zv]Cym
(query); hqW$kw
} j|4tiv>
|- OHve4A
publicList find(finalString query, finalObject x#
8IZ
[.3sE
parameter){ +x]e-P%
return getHibernateTemplate().find - L`7+
uUS)#qM|
(query, parameter); <}2A=~
_
} 5$^c@ 0
gb-tNhJa@b
public PaginationSupport findPageByCriteria X;]3$\F
eH[y[~r
(final DetachedCriteria detachedCriteria){ wE2x:Ge:
return findPageByCriteria #W5Yw>$
-\,VGudM}
(detachedCriteria, PaginationSupport.PAGESIZE, 0); ^[TOZXL`:
} *k6$
P^4'|#~2T
public PaginationSupport findPageByCriteria <^sAY P|
l $ Zs~@N
(final DetachedCriteria detachedCriteria, finalint .tp=T
.v
l="<
startIndex){
p
JX, n
return findPageByCriteria Sf/W9Jw
{6tx,; r(F
(detachedCriteria, PaginationSupport.PAGESIZE, R=86w_
<PQRd
startIndex); llqDT-cp
} Tw}z7U"
R `Q?J[e
public PaginationSupport findPageByCriteria u'Pn(A@1R
_z%\'(l+
(final DetachedCriteria detachedCriteria, finalint GfNWP
{~1M
pageSize, ?,V;f2c
finalint startIndex){ V*uEJ6T
return(PaginationSupport) n}5x-SxS0
_w%s(dzk
getHibernateTemplate().execute(new HibernateCallback(){ B>aEHb
publicObject doInHibernate !vrnoFVu
dw99FA6
(Session session)throws HibernateException { !Iko0#4i
Criteria criteria = p1?J
a;yV#Y
detachedCriteria.getExecutableCriteria(session); f>4+,@G
int totalCount = ds')PIj
d-i&k(M
((Integer) criteria.setProjection(Projections.rowCount {4)5]62>u
:z124Zf
()).uniqueResult()).intValue(); |vT=Nnu
criteria.setProjection vT}pbOTh
dcR6KG 8
(null); G`WzJS*}v
List items = >oB ?
yEnKUo[
criteria.setFirstResult(startIndex).setMaxResults b@F_7P%
<H_LFrB$W
(pageSize).list(); [$H( CH`
PaginationSupport ps = K1
6s)S'
EK.c+Or,
new PaginationSupport(items, totalCount, pageSize, ;<~j)8
m9cj7
startIndex); 9Mut p4#
return ps;
nFVbQa~
} 14;Av{Xt
}, true); '9Qd.q7s|b
} 6yi/YM
@Zh8 QI+
public List findAllByCriteria(final Xe> ~H4I9
"SDsISWd
DetachedCriteria detachedCriteria){ B1HQz@^
return(List) getHibernateTemplate d`<#}-nh
2/UI>@By
().execute(new HibernateCallback(){ P@-R5GK
publicObject doInHibernate #d$d&W~gE
F^[M
(Session session)throws HibernateException { <w%DyRFw3
Criteria criteria = c|3h|
8L@UB6b\
detachedCriteria.getExecutableCriteria(session); jCam,$oE
return criteria.list(); &<#/&Pq/i
} $)Jc-V
6E
}, true); Q=MCMe
} uk`d,xF
E)RI!0Ra
public int getCountByCriteria(final
-kV|
,!8*g[^O
DetachedCriteria detachedCriteria){ (#CBq
Integer count = (Integer) OcLg3.:L
}NR`81
getHibernateTemplate().execute(new HibernateCallback(){ / *Ou$
publicObject doInHibernate +q4W0
1\=pPys)
(Session session)throws HibernateException { R20a(4m
Criteria criteria = `W
D*Q-&n
8rnb
detachedCriteria.getExecutableCriteria(session); )sMAhk|
return AW]("pt
\>w@=bq26
criteria.setProjection(Projections.rowCount #a/n5c&6/
G >I.
()).uniqueResult(); dawVE
O
} 5Q2TT $P
}, true); z2"2tFK
return count.intValue(); W8\PCXnsfl
} F<H`8*q9
} %'$cH$%~J
Ma
n^\gkCi
b0rt.XB
=]2
b8
|F8;+nAVF#
1"*Nb5s
用户在web层构造查询条件detachedCriteria,和可选的 U1OLI]P
{[H4G,QK
startIndex,调用业务bean的相应findByCriteria方法,返回一个 ~x76{.gT
Q'>_59
PaginationSupport的实例ps。 '|h./.K
#mi0x06
ps.getItems()得到已分页好的结果集 uKaf{=*
ps.getIndexes()得到分页索引的数组 7H/!rx
ps.getTotalCount()得到总结果数 @#G6z`,
ps.getStartIndex()当前分页索引 '33Yl+h
ps.getNextIndex()下一页索引 kG_&-b
ps.getPreviousIndex()上一页索引 e2,<,~_K6
\emT:Frb
?Xy w<fMQ
oxxE'cx{g
:*^(OnIe
i2`.#YJ&v
R.^Bxi-UG:
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 P\ Pc/[
Z7
\xa36~hh40
,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 ,.1&Ff)S
S5YDS|K
一下代码重构了。 A`+(VzZgJ
7%~VOB
我把原本我的做法也提供出来供大家讨论吧: Bh.6:9{
WVBE>TB
首先,为了实现分页查询,我封装了一个Page类: 64IeCAMVo
java代码: $j$\ccG
vQ9xG))
#8WR{
/*Created on 2005-4-14*/ a78;\{&L'
package org.flyware.util.page; &@`H^8
3P=Eb!qtdD
/** Vj9`[1}1Z
* @author Joa ~7eUt^SD;
* qHcY
2LV
*/ q?gQ
publicclass Page { *NX*/(Q
6+{ nw}e8
/** imply if the page has previous page */ ~CjmYP'o
privateboolean hasPrePage; #lLn='4
4Tbi%vF{
/** imply if the page has next page */ &~D.")Dz
privateboolean hasNextPage; @et3}-c
-jklH/gF\%
/** the number of every page */ ^OGH5@"
privateint everyPage; ocDVCCkxg
).O\O)K
/** the total page number */ #Fb0;H9`
privateint totalPage; [|P]St-
PN)TX~}
/** the number of current page */ 4w3V!K8
privateint currentPage; m+G0<E%
&6~ncQWu
/** the begin index of the records by the current
4 I]/
=Un 6|]
query */ &<[]X@ bY
privateint beginIndex; qjdahVY
cl9;2D"Zm!
5y
'ycTjY
/** The default constructor */ R`<{W(J;r
public Page(){ $`+~QR!h
F".IB^}$
} joSr,'x
7\|NYT4
/** construct the page by everyPage GoZJDE3
* @param everyPage JUUF^/J
* */ Qnu&GBM
public Page(int everyPage){ c] :J/'vc
this.everyPage = everyPage; "S:NU.c?
} LTlC}3c28f
RQ$o'U9A
/** The whole constructor */ SE7 (+r
public Page(boolean hasPrePage, boolean hasNextPage, d}6AHS[
rym\5
`)
L_CEY
int everyPage, int totalPage, XxrO:$
int currentPage, int beginIndex){ NVM2\fs
this.hasPrePage = hasPrePage; @'G ( k;
this.hasNextPage = hasNextPage; (B?xq1Q
this.everyPage = everyPage; &VBD2_T
this.totalPage = totalPage; `HZHVV$~
this.currentPage = currentPage; 13NS*%~7[
this.beginIndex = beginIndex; pC?1gc1G
} 2L{:H
C#u)$Ds
/** p~{%f#V
* @return JOoLHZQ1v
* Returns the beginIndex. ;*$8iwBQ_
*/ ef1N#z%gt
publicint getBeginIndex(){ GE| ^ryh
return beginIndex; <@;xV_`X+
} d .lu
ZkVvL4yIK
/** -uY:2
* @param beginIndex Z ysUz
* The beginIndex to set. ]ge^J3az$u
*/ :_[cT,3
publicvoid setBeginIndex(int beginIndex){ '| Q*~Lh
this.beginIndex = beginIndex; 5a/
A_..+I
} AFF>r#e
}5c'ui!3H
/** EKJc)|8
* @return 8~L.6c5U
* Returns the currentPage. =dw*B
*/ ;@;ie8H
publicint getCurrentPage(){ W0 ,"V'C
return currentPage; gT\y&
} {/VL\AW5$
jwE(]u
/** eNk!pI7g
* @param currentPage y0y;1N'KK
* The currentPage to set. ]NhWhJ:
*/ n;T
publicvoid setCurrentPage(int currentPage){ n<(5B|~y
this.currentPage = currentPage; K d|l\k!
} ;>x1)|n5
Jhq5G"
/** /)OO)B-r
* @return mDt",#g
* Returns the everyPage. QBT-J`Pz
*/ )-Sl/G
publicint getEveryPage(){ vkauX:M
return everyPage; 7-0twq
} o9SfWErZ
Q9'V&jm
/** l\l]9Z6%
* @param everyPage L08;z
* The everyPage to set. g7q]Vj
*/ d4=u`2w
publicvoid setEveryPage(int everyPage){ .Y Frb+6
this.everyPage = everyPage; ofhZ@3
} `0gK;D8t
WOTu"Yj
/** ` vmk
* @return O%h
97^%k
* Returns the hasNextPage.
C(Gb
*/ T/.y(8!0I8
publicboolean getHasNextPage(){ ra#)*fG,~
return hasNextPage; aNf3 R; *
} vBQ?S2f
{_gj>n (1
/** [tw<TV"\
* @param hasNextPage 'C4Ll2
* The hasNextPage to set. N`GwL
aF
*/ &=t(NI$
publicvoid setHasNextPage(boolean hasNextPage){ s*U&