Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 uJ5Eka
m$W <
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 D6Goa(!9d
p-zXp K"
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 -!N&OZ+R
nx^]>w
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 d~:!#uWyFk
DJ(q
7W
。 TT4./R:
7qg{v9|,
分页支持类: )p~BQ~eip;
[I$BmGQ
java代码: \7l-@6'7
g)_e]&
{jho&Ai
package com.javaeye.common.util; bV$)!]V
_;~,Cgfi
import java.util.List; oNU0 qZ5
<Gt2(;
publicclass PaginationSupport { jp"JafS/E
x-AZ%)N9
publicfinalstaticint PAGESIZE = 30; JoN\]JL\,
$;/}?QY(
privateint pageSize = PAGESIZE; `}lJH i
2#<xAR
privateList items; u#V5?i
:)_~w4&
privateint totalCount; w -
Pk7I
sM?MLB\Za
privateint[] indexes = newint[0]; o_D?t-XH
5K<5kHpvJ{
privateint startIndex = 0; u9}1)9
?I[8'
public PaginationSupport(List items, int 0em#-*|2"
^H2-RBE#
totalCount){ \yd
s5g!:
setPageSize(PAGESIZE); spGB)k,^
setTotalCount(totalCount); 'C:>UlzLy
setItems(items); W0k0$\iX
setStartIndex(0); E2"q3_,,
} 5fm?Lxr&?
Qum9A
public PaginationSupport(List items, int q@@T]V6
phn9:{TI
totalCount, int startIndex){ .GsO.#p{
setPageSize(PAGESIZE); AjT%]9
V?
setTotalCount(totalCount); O=$~O\}b
setItems(items); YQpSlCCo
3
setStartIndex(startIndex); /}PF\j9#4
} )EL!D%<A
qnoNT%xazo
public PaginationSupport(List items, int ??i,Vr@)w
"bm
totalCount, int pageSize, int startIndex){ <IC~GqXv
setPageSize(pageSize); XP1~d>j
setTotalCount(totalCount); -Y
H<
setItems(items); lK4M.QV
?\
setStartIndex(startIndex); aAA9$
} CWNx4)ZGw
,daKC
publicList getItems(){ &3$z4df
return items; =Apxdnz,
} Ojt`^r !V
g=]u^&
publicvoid setItems(List items){ >9f%@uSM$3
this.items = items; sp
]zbX?
} h~(D@/tB
e+j)~RBnu3
publicint getPageSize(){ >A<bBK#
return pageSize; Z-U-N
} :pF_GkG
TU GNq
publicvoid setPageSize(int pageSize){ h?f>X"*|(
this.pageSize = pageSize; ]ZoD'-,
} pFm=y#!t
jU3Z*Z)zN
publicint getTotalCount(){ QJW`}`R
return totalCount; 1mSaS4!"B
} 8CC/ BOe
a{!r`>I\f
publicvoid setTotalCount(int totalCount){ >qo~d?+
if(totalCount > 0){ [,~TaP}m
this.totalCount = totalCount; Y
e+Ay
int count = totalCount / 6] z}#"
UkfB^hA
pageSize; gr-x|wK
if(totalCount % pageSize > 0) %>WbmpIyc
count++; ;U`X 6d
indexes = newint[count]; .5Q:Xp
for(int i = 0; i < count; i++){ `*\{.;,]#
indexes = pageSize * a45ss7
ibdO*E
i; jko"MfJ
} CkRX>)=py
}else{ (vJ2z
=z
this.totalCount = 0; 8V$3b?]
} [ut#:1h^
} \;]kYO}
`!G7k
publicint[] getIndexes(){ vtMJ@!MN;
return indexes; }'=h4yI
} sl/)|~3!8
-qe bQv
publicvoid setIndexes(int[] indexes){ fj4^VXD
this.indexes = indexes; {BO|u{C
} 1Qh`6Ya f
|*,jU;NI
publicint getStartIndex(){ &!y]:CC{
return startIndex; -U>7
H`5
} {*/dD`
t]^_l$
publicvoid setStartIndex(int startIndex){ );
6,H.v
if(totalCount <= 0) :+,st&(E
this.startIndex = 0; Z,WW]Y,$
elseif(startIndex >= totalCount) +#]|)VZ
this.startIndex = indexes C%ytkzG_
1.R
kIB
[indexes.length - 1]; r(}nhU Q%E
elseif(startIndex < 0) |,}E0G.
this.startIndex = 0; =Mhg
else{ <]8^J}8T{D
this.startIndex = indexes 9.0WKcwg
0k?Sq#7q
[startIndex / pageSize]; 9B)lGLL}q
} E' %lxr
} 7aQcP
u fw cF*
publicint getNextIndex(){ GM}C]MVD
int nextIndex = getStartIndex() + Z~3u:[x";
IMad$AKc
pageSize; ygvzdYd
if(nextIndex >= totalCount) +$(0w35V5
return getStartIndex(); m{&w{3pQk
else Q-R}qy5y
return nextIndex; jX|=n.#q
} g8yN%)[
+AK:(r
publicint getPreviousIndex(){ @8"18HEp#
int previousIndex = getStartIndex() - U1Yo7nVf
3cu9[~K
pageSize; m.V,I}J.q
if(previousIndex < 0) )
p^
return0; \n@V-b
else p`GWhI?
return previousIndex; 8X~h?^Vz
} p^8JLC
?`A9(#ySM
} 2cjEex:&
B~_Spp
9d"5wx
pruWO'b`
抽象业务类 l7Lj[d<n
java代码: wsfysat$
& z gPN8u
>tEK+Y|N}
/**
1#D<ZN
* Created on 2005-7-12 B+Q+0tw*i
*/ WW3
B
package com.javaeye.common.business; 1CiA 8
jvO3_Zt9
import java.io.Serializable; cDO:'-
import java.util.List; ?48AY6
966<I56+
import org.hibernate.Criteria; cno;>[$
import org.hibernate.HibernateException; RH=$h! 5
import org.hibernate.Session; ,F}r@
import org.hibernate.criterion.DetachedCriteria; 4OEKx|:5n
import org.hibernate.criterion.Projections; )]A9~H
import N<"`ShCNM
l% |cB93
org.springframework.orm.hibernate3.HibernateCallback; 3"vRK5Bf
import XSl!T/d
/u?9S/
org.springframework.orm.hibernate3.support.HibernateDaoS WQ.i$ID/
~B*~'I9b*
upport; 3d@ef|
:Q=z=`*2w
import com.javaeye.common.util.PaginationSupport;
7&px+155
I<xy?{s
public abstract class AbstractManager extends CfY7<o1>
V*~423
HibernateDaoSupport { lDlj+fK
I)rGOda{
privateboolean cacheQueries = false; 1XGG.+D
u6p5:oJj,
privateString queryCacheRegion; +]_nbWL(%
>"bnpYSe
publicvoid setCacheQueries(boolean yIa[yJq
jPpRsw>
cacheQueries){ ~z>BfL
this.cacheQueries = cacheQueries; S{ey@X(
} W8x[3,gT
IyT?-R
publicvoid setQueryCacheRegion(String <g*.p@o
?n&$m
queryCacheRegion){ r/^tzH's
this.queryCacheRegion = RE*WM3QK~
s{cKBau
queryCacheRegion; joY1(Y
} K Ka c6Zj
@7 )Z
publicvoid save(finalObject entity){ l3BD
<PB2S
getHibernateTemplate().save(entity); |@+8]dy:l
} 0FTRm2(
Vj/fAHR`>'
publicvoid persist(finalObject entity){ 90?,-6
getHibernateTemplate().save(entity); T6,V
} tnN'V
D7M0NEY
publicvoid update(finalObject entity){ 6GY32\Ac
getHibernateTemplate().update(entity); q%DVDq( z
} Z6NJ)XQy6F
`(!W s\:
publicvoid delete(finalObject entity){ #jhQBb4?,
getHibernateTemplate().delete(entity); @T5YsX]qb7
} .r7D)xNa@
0Y[*lM-
publicObject load(finalClass entity, =?wMESU
)-)ss"\+Ju
finalSerializable id){ (LRNU)vD7$
return getHibernateTemplate().load o*-h%Z.
2ve
lH;
(entity, id); NP$e-" 1
} 7Nd*,DV_
yLjV[qP
publicObject get(finalClass entity, 1!X1wCT
#NWZ k.S
finalSerializable id){
E!dz/.
return getHibernateTemplate().get qo)Q}0
(QhGxuC
(entity, id); ESn6D@"
} <V7SSm
n?zbUA#
publicList findAll(finalClass entity){ Fq vQk
return getHibernateTemplate().find("from eVZa6la"
-l\~p4U
" + entity.getName()); ~g*Y,
Y
} ;I[ht
'$n:CNha
publicList findByNamedQuery(finalString j?Cr31
AQB1gzE
namedQuery){ lTxY6vi
return getHibernateTemplate v&p,Clt-2
r hiS
().findByNamedQuery(namedQuery); caGML|DeI
} 8.*\+nH
$dlnmNP+
publicList findByNamedQuery(finalString query, 5dg-d\6S
?(fQ<i n
finalObject parameter){ 7vii9Am7
return getHibernateTemplate A
Z4|&iT
Ko1AaX(I'+
().findByNamedQuery(query, parameter); x1 .3W j
} =''mpIg(
=$^Wkau
publicList findByNamedQuery(finalString query, 0|.7Kz^
8]sTX9
finalObject[] parameters){ R#"U/8b>z
return getHibernateTemplate ]jHgo](%
IUluJ.sXIf
().findByNamedQuery(query, parameters); V<7R_}^_7
} 8W19#?7>B
\Ku9"x
publicList find(finalString query){ +L^A:}L(
return getHibernateTemplate().find M3DxapG
1 ;_{US5FR
(query); 66I|0_
} +CsI,Uf4*
g2+l@$W
publicList find(finalString query, finalObject RY\{=f
ExNj|*
parameter){ _ff=B
return getHibernateTemplate().find a/`c ef
"2)+)Db
(query, parameter); >Sc$R0
} /Oq1q._9F
3S[w'
public PaginationSupport findPageByCriteria 03X<x|
xB?S#5G}
(final DetachedCriteria detachedCriteria){ Gl?P.BCW.&
return findPageByCriteria #2_o[/&}x@
K!IF?iell
(detachedCriteria, PaginationSupport.PAGESIZE, 0); =q_&*'
} 1_Dn?G^H
Ck ~V5
public PaginationSupport findPageByCriteria 1$='`@8I
j[$B\H
(final DetachedCriteria detachedCriteria, finalint uznoyj6g
8CHb~m@^$
startIndex){ pr0@sri@
return findPageByCriteria "/4s8.dw+u
O ,Pl7x%tK
(detachedCriteria, PaginationSupport.PAGESIZE, w?V[[$
g5kYyE
startIndex); $$2S*qY
} 09}f\/
l|@/?GaH
public PaginationSupport findPageByCriteria q|47;bK'
BiHiVhD_
(final DetachedCriteria detachedCriteria, finalint 4
|:Q1
$I}Hk^X
pageSize, >wg9YZ~8
finalint startIndex){ Sb:zN'U
return(PaginationSupport) !wLH&X$XT
/%J&/2Wz
getHibernateTemplate().execute(new HibernateCallback(){ H6%!v1 u
publicObject doInHibernate Sy+]SeF&
877EKvsiC
(Session session)throws HibernateException { ,6EZb[;g^
Criteria criteria = U}RS*7`
~uhyROO,G"
detachedCriteria.getExecutableCriteria(session); D&z'tf5
int totalCount = a'_MhJ zs
I{?E /Sc
((Integer) criteria.setProjection(Projections.rowCount 1K?
&
J2
.T#y N\S1
()).uniqueResult()).intValue(); X%4uShM
criteria.setProjection ]v^`+s}3
p0[,$$pM
(null); 'K;4102\
List items = Y2=Brtc[@
RS||KA])J
criteria.setFirstResult(startIndex).setMaxResults o-Q]Dk1W
|g?/~%7
(pageSize).list(); VQNYQqu`[
PaginationSupport ps = 4,w{rmj
F653[[eQ
new PaginationSupport(items, totalCount, pageSize, {0A[v}X ~
g9([3pV,
startIndex); ga{25q}"
return ps; x;ICV%g/
} FfD
,cDs
}, true); AjL?Qh4
} r3c\;Ra7
sO{0hZkc
public List findAllByCriteria(final @R'g@+{I
j^aQ>(t(9
DetachedCriteria detachedCriteria){ U>L=.\\|
return(List) getHibernateTemplate 86^ZYh
mf*9^}l+Zn
().execute(new HibernateCallback(){ q5I4'6NF
publicObject doInHibernate ^EuyvftZ
r.a9W?(E
(Session session)throws HibernateException { 0'q(XB`i=
Criteria criteria = wCq)w=,
d5sGkR`(
detachedCriteria.getExecutableCriteria(session); ~G{$ P'[
return criteria.list(); Hz3 S^o7
} #>=/15:
}, true); XftJ= *
} A=qW]Im
J++sTQ(!?
public int getCountByCriteria(final }<\65 B$1
D25gg
DetachedCriteria detachedCriteria){ WkDn
Integer count = (Integer) $Va]vC8?
:i,c<k
getHibernateTemplate().execute(new HibernateCallback(){ 2LxVt@_R!%
publicObject doInHibernate ek{PA!9Sk
>Rki[SNb-b
(Session session)throws HibernateException { j3rv2W\
Criteria criteria = )Py+jc.
E9Xk8w'+
detachedCriteria.getExecutableCriteria(session); Y%CL@G60
return { ck
LHHDt<+B
criteria.setProjection(Projections.rowCount X^
^?}>t[
"mP*}VF
()).uniqueResult(); X,!OWz:[
} wh7a|
}, true); @'<j!CqQ
o
return count.intValue(); %\{?(baOA
} .f92^lu9
} { Sliy'
3 ?|; on
l LD)i J1
?;KJ
(@Va
P"PeLB9K
S4:\`Lo-;
用户在web层构造查询条件detachedCriteria,和可选的 eR*
]<0=
[;CqvD<S
startIndex,调用业务bean的相应findByCriteria方法,返回一个 Lx:9@3'7'
$Z7|t
PaginationSupport的实例ps。 E=1/
Lq
$4.l[j
ps.getItems()得到已分页好的结果集 Znl>*e/|
ps.getIndexes()得到分页索引的数组 Zz)oMw
ps.getTotalCount()得到总结果数 lRATrp#T
ps.getStartIndex()当前分页索引 8apKp?~yW
ps.getNextIndex()下一页索引 iB`WXU
ps.getPreviousIndex()上一页索引 '3_B1iAv
mKFHT
8.Own=G?
^1Zq0
/glnJ3
7@y!R
pffw5Tc
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 >yT@?!/Q>'
yE|}
r
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ]I' xLh`
-IsdU7}
一下代码重构了。 ]Y:
W[p
g@6X|W5,J
我把原本我的做法也提供出来供大家讨论吧: .'2gJ"?,
2hA66ar{$
首先,为了实现分页查询,我封装了一个Page类: ~S=fMv^BR
java代码: m6Cd^'J9^
w4MMo
J!fc)h
/*Created on 2005-4-14*/ 6k=Wt7C
package org.flyware.util.page; D%Jc?6/I#3
,N|R/Vk$+E
/** |9"^s x
* @author Joa 8 8=c3^
* iN/!k.ybW}
*/ 6p]R)K>wS
publicclass Page { Qbt>}?-
H6CGc0NS+
/** imply if the page has previous page */ 8J?`_
privateboolean hasPrePage; "JLhOTPaHf
|e;z"-3
/** imply if the page has next page */ @NwM+^
privateboolean hasNextPage; `::'UfHc
K2o0L5Lke
/** the number of every page */ 3k[<4-
privateint everyPage; ecI
2]aKi
D&6Qk&>
/** the total page number */ T&MS_E&;
privateint totalPage; I4X+'fW,
I)%jPH:ua
/** the number of current page */ Q;,3W+(
privateint currentPage; #`)-$vUv^f
-%gd')@SfD
/** the begin index of the records by the current ~+iJpW
$`dNl#G,
query */ 4N=Ie}_`
privateint beginIndex; OQ&D?2r
JEF7hJz~
gsm^{jB
/** The default constructor */ =RE_Urt:
public Page(){ >A( C9_\
a`X&;jH0ef
} /F}\V
^
8*~:gZ7:
/** construct the page by everyPage 3[i!2iL.
* @param everyPage T9<nD"=:
* */ \HEo8~TY
public Page(int everyPage){ e^_@^(||!6
this.everyPage = everyPage; p#BvlS=D
} <Jrb"H[T"
(U(x[Df)
/** The whole constructor */ K2K6
public Page(boolean hasPrePage, boolean hasNextPage, ~@?-|xLqQ
^? xJpr%)
j/mp.'P1k
int everyPage, int totalPage, K0H!Ds9
int currentPage, int beginIndex){ v/+}FS=
this.hasPrePage = hasPrePage; EAXU{dRV
this.hasNextPage = hasNextPage; dq/?&X
this.everyPage = everyPage; mqT0^TNPcl
this.totalPage = totalPage; CuO*>g^K[
this.currentPage = currentPage; gH55caF<
this.beginIndex = beginIndex; _W@Fk)E6N
} zP'pfBgbJW
@M?EgVmW
/** 5T3>fw2G
* @return Kf^F#dA
* Returns the beginIndex. fqs p1m$
*/ 2Wf qgR[3
publicint getBeginIndex(){ 6="&K_Q7
return beginIndex; <+,0G`
} wggHUr(g,
-gGK(PIf
/** j6(IF5MqP
* @param beginIndex H{zuIN/.1
* The beginIndex to set. 'c{]#E1}
*/ Z9~Wlt'?
publicvoid setBeginIndex(int beginIndex){ c7!`d.{90
this.beginIndex = beginIndex; 2e@\6l,!^
} (w
B[ ]O$@
A@AGu#W
/** !Y(qpC:$
* @return K05Y;URbd
* Returns the currentPage. ''Ec-b6Q-
*/ >F_Ne)}qTQ
publicint getCurrentPage(){ lS-i9U/,>
return currentPage; "FvlZRfXj
} F<Z=%M3e
d'fpaLV
/** U%\2drM&]
* @param currentPage x99
Oq!
* The currentPage to set. yS3s5C{C
*/ =Fl4tY#X
publicvoid setCurrentPage(int currentPage){ IOqyqt'
this.currentPage = currentPage; Dy@NgHe
} # |[@Due
`.WKU"To
/** ^BTNx2VHf
* @return S`@*zQ
* Returns the everyPage. Vs"Q-?
*/
jhM|gV&
publicint getEveryPage(){ v"_#.!V
return everyPage; ITUl-L4xE
} ~J:lCu
E|3aiC,5
/** !Sh5o'D28
* @param everyPage [_1G\z_iE
* The everyPage to set. b"bj|qF~E
*/ XX6)(
publicvoid setEveryPage(int everyPage){ OAOmd
4
this.everyPage = everyPage; I!'(>VlP7
} )\G#[Pc7
=@l5He.]&
/** bYH_U4b
* @return 7B`0mK3
* Returns the hasNextPage. T/5UlW|\
*/ ,DLNI0uV
publicboolean getHasNextPage(){ WfZ#:G9
return hasNextPage; YO+d+5
} ,#Y".23G
M
-TK
/** J1t?Qj;f3
* @param hasNextPage W#\4"'=I
* The hasNextPage to set. o*'3N/D~
*/ k{62UaL.
publicvoid setHasNextPage(boolean hasNextPage){ R8*4E0\br
this.hasNextPage = hasNextPage; *CSFkWVa
} &LYZQ?|
cG6+'=]3<
/** r; !us~
* @return >=Veu; A
* Returns the hasPrePage. rD?o97
*/ ccAEN
publicboolean getHasPrePage(){ F$C:4c
return hasPrePage; gO36tc:ce
} ]dFWIvC
*L_wRhhk
/** n2~rrQ
\/p
* @param hasPrePage /qG?(3
* The hasPrePage to set. -xlI'gNg7
*/ L^}kwu#
publicvoid setHasPrePage(boolean hasPrePage){ _qfdk@@g
this.hasPrePage = hasPrePage; 9AaixI
} ~Tolz H!
$2 0*&4y^
/** :+n7oOV
* @return Returns the totalPage. EIAT*l :NW
* w:Vs$,
*/ wqsnyP/m
publicint getTotalPage(){ gnt[l0m
return totalPage; xgVt0=q
} z`CIgSR
:tMWy
m
/** = 8n*%NC
* @param totalPage #'T@mA
* The totalPage to set. N?p$-{
*/ 3? "GH1e
publicvoid setTotalPage(int totalPage){ _G42|lA$/
this.totalPage = totalPage; <?eZ9eB
} mz''-1YY$
va)\uXW.N
} <e"2<qVi
V.}U p+WL
<W1!n$V ]
s_|wvOW)'
mtp[]
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 r mhB!Lo
#~Q0s)Ze
个PageUtil,负责对Page对象进行构造: 59LIK&w
java代码: #t\Oq9}^
uAJC Q)@
h&XyMm9C
/*Created on 2005-4-14*/ -$*YN{D+
package org.flyware.util.page; G{:L^2>
/3fo=7G6
import org.apache.commons.logging.Log; a)xN(xp##
import org.apache.commons.logging.LogFactory; /[mCK3_
)pJzw-m"
/** 6Rso}hF}}
* @author Joa WWY9U
* 2>mDT
*/ YVzK$k'3U
publicclass PageUtil { 6@ +
>UZr\
{3?g8e]zr
privatestaticfinal Log logger = LogFactory.getLog 6w5 4+n
mu(S9
(PageUtil.class); tNtP+v-{
joa$Y6
/** 9yQ[ *
* Use the origin page to create a new page xv
/w %
* @param page Z0x N9S
* @param totalRecords 7XZ!UC;i
* @return z E{.oi
*/ (2S,0MHk
publicstatic Page createPage(Page page, int 3)=$BSC%
(FBKP#x)^
totalRecords){ \KG{
11
return createPage(page.getEveryPage(), Eh JYdO[e
KzhldMJ^zq
page.getCurrentPage(), totalRecords); ^ c:(HUo#
} K,J:i^2
rZ^DiFR
/** b
afYjF< 3
* the basic page utils not including exception TkK- r(=
.L8S_Mz
handler "g0Ln5&
* @param everyPage .@R{T3=Q
* @param currentPage 2/I^ :*e
* @param totalRecords wAITE|H<zj
* @return page G|.>p<q
*/ &B[$l`1
publicstatic Page createPage(int everyPage, int zK33.HY
,!c.
currentPage, int totalRecords){ 2 3 P7~S
everyPage = getEveryPage(everyPage); 1Ocyrn
currentPage = getCurrentPage(currentPage); :H6Ipa
int beginIndex = getBeginIndex(everyPage, afH`<!
`_<K#AG Ai
currentPage); ]XU?Wg
int totalPage = getTotalPage(everyPage, 7\5;;23N4
\6*3&p
totalRecords); ,xNuc$8Jd
boolean hasNextPage = hasNextPage(currentPage, MAhcwmZNy
ZY=x$($f
totalPage); <kt,aMw[*
boolean hasPrePage = hasPrePage(currentPage); S's\M5
cs,%Zk.xjw
returnnew Page(hasPrePage, hasNextPage, Lylw('zZ
everyPage, totalPage, Wn<