Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 TnaIRJ\B
Fszk?0T
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ha),N<'
d?P
aZz{4
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 0Yjy
&4[iC/}
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 5nn*)vK {
Bm7GU`j"
。 QE}@|H9xs
4yM8W\je
分页支持类: r/T DU[`&
^,5.vfES
java代码: ^9RBG#ud
_#F'rl6'
uR%H"f
package com.javaeye.common.util; qpeK><o
*3K"Kc2
import java.util.List; #?=cg]v_
,'673PR
publicclass PaginationSupport { FS}z_G|4]
+J4t0x
publicfinalstaticint PAGESIZE = 30; %dU}GYL_
>dl!Ep
privateint pageSize = PAGESIZE; N9ufTlq
s
~z}au"k
privateList items; !T{g& f
Wd}mC<rv1
privateint totalCount; )pLq^j
>`uS NY"tO
privateint[] indexes = newint[0]; RVsN r
rZ
M Sj0D2H
privateint startIndex = 0; 7a<qP=J
N
[u
Xo
public PaginationSupport(List items, int -CrZ'k;4
&F}+U#H
totalCount){ Chup %F
setPageSize(PAGESIZE); &B4U)
setTotalCount(totalCount); w3Ohm7N[
setItems(items); ]>L]?Rm
setStartIndex(0); +*DX(v"BH
} >cNXB7]E>
-DnK)u\@
public PaginationSupport(List items, int hrD6r=JT<~
OQQ9R?Ll{
totalCount, int startIndex){ k#(cZ
setPageSize(PAGESIZE); QA(,K}z~^S
setTotalCount(totalCount); ^IpiNY/%Q
setItems(items); 1#<E]<='t
setStartIndex(startIndex); v1=X =H
} bZXNo
/<$"c"UQ
public PaginationSupport(List items, int n:D*r$ C|p
,Tl5@RN
totalCount, int pageSize, int startIndex){ kU/=Du
setPageSize(pageSize); 3>" h*U#
setTotalCount(totalCount); 4g9b[y~U
setItems(items); \ c&)8.r
setStartIndex(startIndex); &^_(xgJL
} (O2HB-<rY
eeZysCy+DY
publicList getItems(){ V2,WP
return items; n y)P
} u&x K>7
([-=NT}Aq
publicvoid setItems(List items){
,<^HB+{Wo
this.items = items; ha=z<Q
} =>
=x0gsgj
q4iD59yd)S
publicint getPageSize(){ g4~qcI=a
return pageSize; WN#lfn8 7
} h.;CL#s
I uj=d~|>
publicvoid setPageSize(int pageSize){ rb'Gve W[
this.pageSize = pageSize; jSYg\Z5!
} O97bgj]
1>VS/H`
publicint getTotalCount(){ b
H_pNx81
return totalCount; c$kb0VR
} ON0+:`3\
Q;/F0JDH
publicvoid setTotalCount(int totalCount){ Ch9!AUiR
if(totalCount > 0){ +~Ay h[V
this.totalCount = totalCount; O)uM&B=
int count = totalCount / 1cBhcYv"
xPup?oP >
pageSize; !<zzP LC
if(totalCount % pageSize > 0) '5/}MMT
count++; dJ:x1j
indexes = newint[count]; Q'%o;z*
for(int i = 0; i < count; i++){ _-J @$d%
indexes = pageSize * sC_UalOC_
/2Lo{v=0[
i; V55J[s*6!
} =awO63j>
}else{
t} i97 ;
this.totalCount = 0; B"9hQb
} iv+jv2ZF%
} j&
iL5J;
Q@wq
}vc!
publicint[] getIndexes(){ P`dHR;Y0
return indexes; @) ZO$h
} RIEv*2_O
1bZiPG{
publicvoid setIndexes(int[] indexes){ pptM&Y
this.indexes = indexes; MlK`sH6
} zWs*kTtA
4t
Nv q
publicint getStartIndex(){ h+~df(S.
return startIndex; YOV4)P"
} E97+GJ3
SWjQ.aM
publicvoid setStartIndex(int startIndex){ Q!Ow{(|
if(totalCount <= 0) ~po%GoH(K
this.startIndex = 0; pJIE@Q|hi
elseif(startIndex >= totalCount) _*ouo<x
this.startIndex = indexes NTXL>Q*e
nH>V Da
[indexes.length - 1]; b]<HhU
elseif(startIndex < 0) VNrO(j DUv
this.startIndex = 0; rgdQR^!l6
else{ cYM~IA
this.startIndex = indexes U+PCvl=x
Cz@FZb8
[startIndex / pageSize]; ,r 2VP\hLh
} V.Ba''E7
} )s<WG}
Yuo1'gE+
publicint getNextIndex(){ ?QSx8d
int nextIndex = getStartIndex() + BU:Ecchbr
n R\n\
pageSize; [TK? P0
if(nextIndex >= totalCount) /witDu7
return getStartIndex(); I\rZk9F
else 2PR7M.V7
return nextIndex; >mFX^t_,
} x`+
l#
lIVxW+
publicint getPreviousIndex(){ w"a 9'r
int previousIndex = getStartIndex() - vDW&pF_eI>
4l
ZJb
pageSize; HKiVEg
if(previousIndex < 0) )'!ml
return0; kV\-%:-
else Ue3B+k9w
return previousIndex; ?S@R~y0K
} }-{ b$6]
;4kx >x*H
} te;Ox!B&
@0ov!9]Rw-
,.oa,sku
r'd:SaU+
抽象业务类 WHgV_o 8
java代码: "VDk1YX_&l
umm \r&]A
*"ykTqa
/** L8:]`MQ0
* Created on 2005-7-12 +2EHmuJ;
*/ y)p$_.YFF
package com.javaeye.common.business; Bn1L?>G
2~M;L&9-
import java.io.Serializable; eA1k)gjE
import java.util.List; 8K.s@<
oE!hF }O
import org.hibernate.Criteria; }0BL0N`_
import org.hibernate.HibernateException; cB ab2/
import org.hibernate.Session; 8lOZIbwS
import org.hibernate.criterion.DetachedCriteria; BZJKiiD
import org.hibernate.criterion.Projections; C!7U<rI
import @1<omsl
Ehb?CnV#J
org.springframework.orm.hibernate3.HibernateCallback; T/wM(pr'
import TwM1M["3
,b6kTQq
org.springframework.orm.hibernate3.support.HibernateDaoS nY{i>Y
NokXE
upport; Z[#I"-Q~:
'f-
import com.javaeye.common.util.PaginationSupport; HZDk
<aU/!
{ r6]MS#l1
public abstract class AbstractManager extends MUbhEau?
5;FP.{+
HibernateDaoSupport { V<i<0E
N 8:"&WM
privateboolean cacheQueries = false; e86Aqehle
'bB>$E
privateString queryCacheRegion; U_x0KIm
J 16=!q()
publicvoid setCacheQueries(boolean 1Q&cVxA"\
v#<\:|XAg
cacheQueries){ 2q"_^deI5*
this.cacheQueries = cacheQueries; M'cJ)-G
} uX[O,l^}
e1%rVQ(v
publicvoid setQueryCacheRegion(String g|ql 5jW
FNz84qVIx'
queryCacheRegion){ 3TU'*w
&
this.queryCacheRegion = 7o;x (9
j7@!J7S
queryCacheRegion; ljup#:n
} u lH0%`Fi
V.;:u#{@-Q
publicvoid save(finalObject entity){ @Pxw hlxa
getHibernateTemplate().save(entity); DH\wDQ
} DUZQO{V
!Z
U_,[
publicvoid persist(finalObject entity){ kU#:I9PO
getHibernateTemplate().save(entity); f\h%; X
} ,dHP`j ?
z@!^ow)`J
publicvoid update(finalObject entity){ Y*Y&)k6t
getHibernateTemplate().update(entity); T$H2'tK|
} rGTWcJ
=LXvlt'Q34
publicvoid delete(finalObject entity){ `]K,'i{R
getHibernateTemplate().delete(entity); ;c>>$lr
} yDd=&
T
4JGE2ArR
publicObject load(finalClass entity, G$cxDGo
HG3.~ 6X
finalSerializable id){ HR[Q
?rg
return getHibernateTemplate().load 'Z\{D*=V8
X!T|07#c
(entity, id); TT|-aS0l(u
} ob0~VEH-
LkaG8#m1R
publicObject get(finalClass entity, M$,Jg5Dc
)*!1bgXQ
finalSerializable id){ NmjzDN
return getHibernateTemplate().get jo_o`j
mYX56,b}5
(entity, id); ewo*7j4*
} XDHLEG-u(
q z=yMIy=
publicList findAll(finalClass entity){ b![t6-f^z
return getHibernateTemplate().find("from U8YO0}_z
"VV914*z
" + entity.getName()); j,}4TDWa
} Ip>^O/}$1
9U]pH%.9
publicList findByNamedQuery(finalString DeA @0HOxh
}g}6qCv7
namedQuery){ a
]>V ZOet
return getHibernateTemplate >/b^fAG
<E"*)Oi
().findByNamedQuery(namedQuery); -dg} BM
} u-lrTa""z
N].4"0Jv-D
publicList findByNamedQuery(finalString query, KZECo1
5QR}IxQ
finalObject parameter){ GXO4x|08F
return getHibernateTemplate *0O<bm
O-Dc[t%
().findByNamedQuery(query, parameter); gyC^K3}
} ;JYoW{2
m6-76ma,hi
publicList findByNamedQuery(finalString query, NvcHv7,
9KXym }
finalObject[] parameters){ QS\Uq(Ja\
return getHibernateTemplate ^,Xa IP+[
60'6/3
().findByNamedQuery(query, parameters); L5/mO6;k
} s){Q&E~X
7O:"~L
publicList find(finalString query){ p[u4,
return getHibernateTemplate().find "rVU4F)
T4eWbNSs
(query); kr#I{gF
} ~fBex_.o*
j13riI3A
publicList find(finalString query, finalObject oK)[p!D?0{
&%6NQWW
parameter){ Q]/B/
return getHibernateTemplate().find ,pn)>
9MT3T?IS
(query, parameter); {ZG:M}ieN
} B9}E
{)T?
M=W
4:H,gx
public PaginationSupport findPageByCriteria YtMlqF
]s_@n!
(final DetachedCriteria detachedCriteria){ au}s=ua~i
return findPageByCriteria NK~PcdGl
k9l^6#<?
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 4x(F&0
} bhn5Lz$z
+SyUWoM
public PaginationSupport findPageByCriteria b]w[*<f?
0:. 6rp
(final DetachedCriteria detachedCriteria, finalint /V#7=,,
#J\s%60pt
startIndex){ r4EoJyt
return findPageByCriteria ~zMDY F"&
n%*tMr9 s
(detachedCriteria, PaginationSupport.PAGESIZE, Z&A0hI4d
TQ?#PRB
startIndex); B_cgWJ*4
} :Z[(A"dA
a/b92*&k
public PaginationSupport findPageByCriteria kB
V/rw
>{b3>s~T
(final DetachedCriteria detachedCriteria, finalint Uh}+"h5
nW11wtiO.
pageSize, T RDxT
finalint startIndex){ 3 tF:
return(PaginationSupport) !x8kB
Di,
L$SMfx
getHibernateTemplate().execute(new HibernateCallback(){ T!(sZf
publicObject doInHibernate 7x(v?
.D!WO
(Session session)throws HibernateException { pUGN!3
Criteria criteria = dkpQZXi9%
# v+;:
detachedCriteria.getExecutableCriteria(session); FJ}gUs{m
int totalCount = -qfnUh
lM$t!2pRB
((Integer) criteria.setProjection(Projections.rowCount >%l:Dw\A:
^iuo^2+
()).uniqueResult()).intValue(); D&-vq,c
criteria.setProjection i+I0k~wY
ZL,6_L/
(null); t| _{;!^
List items = FD))'!>
94y9W#
criteria.setFirstResult(startIndex).setMaxResults 6P^hN%0
~pRs-
(pageSize).list(); ^\T]r<rCY
PaginationSupport ps = %W&1`^Jl
~TM>"eB b
new PaginationSupport(items, totalCount, pageSize, \+9;!VWhl
JL``iA
startIndex); c@9##DPn
return ps; &y\igX1
} (Igu:=
}, true); #n#HzbT
} 9OfU7_m
9>;} /*:H
public List findAllByCriteria(final ZL,8,;]
a MsJO*;>
DetachedCriteria detachedCriteria){ 3Soy3Xp
return(List) getHibernateTemplate y]
y9'5_
%0zS
().execute(new HibernateCallback(){ 'gCZ'edM
publicObject doInHibernate 6uqUiRs()
HD H
(Session session)throws HibernateException { ##GY<\",;
Criteria criteria = {m'AY)
c})wD+1
detachedCriteria.getExecutableCriteria(session); vzG ABP
return criteria.list(); e,"FnW
} 3e *-\TP-
}, true); )P%4:P
} E<k^S{
M9DgO4xl
public int getCountByCriteria(final ?M~
k$
h;nQxmJ9
DetachedCriteria detachedCriteria){ ^N{k6>;
Integer count = (Integer) ,\x$q'
[4: Yi{>
getHibernateTemplate().execute(new HibernateCallback(){ q~M2:SN@X
publicObject doInHibernate OT@yPG
%{"dP%|w4}
(Session session)throws HibernateException { kIX)oD}c
Criteria criteria = }jiK3?e
6bUl>4
detachedCriteria.getExecutableCriteria(session); fbV@= (y?
return v^TkDf(Oz
7D9]R#-K
criteria.setProjection(Projections.rowCount ]Zk}ZG>6
o[^Q y(2~
()).uniqueResult(); -yl;3K]l
} }uiPvO+&p
}, true); a
ea0+,;
return count.intValue(); mrqaM2,(I
} p#=;)1
} EZ{\D!_Y
+q-c8z
]!faA\1
LQ>$>A(
6n,xH!7
Yv=g^tw
用户在web层构造查询条件detachedCriteria,和可选的 T%~SM5
A2BRbwr>
startIndex,调用业务bean的相应findByCriteria方法,返回一个 t}~UYG(h~
G
B&:G V
PaginationSupport的实例ps。 aj
v}JV&:
tah}^
ps.getItems()得到已分页好的结果集 D2]ZMDL.
ps.getIndexes()得到分页索引的数组 }I'^./za
ps.getTotalCount()得到总结果数 ?0) @jc=
ps.getStartIndex()当前分页索引 Q.E_:=*H
ps.getNextIndex()下一页索引 EBwK 7c
ps.getPreviousIndex()上一页索引 In+^V([u+_
cm,4&x6
S (tEwXy
R"{l[9j4>
`I#`:hj
lRH0)5`
LD_M 3
P
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 /ao<A\KR
7 Kjj?~RA
,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 %"+4
D,'l
yzg9I
一下代码重构了。 /GN4I!LA
+ouY
我把原本我的做法也提供出来供大家讨论吧: ~#4~_d.=L
{G%3*=?,j
首先,为了实现分页查询,我封装了一个Page类: hIo0S8MOj$
java代码: }Aw47;5q;
&=NJ
7H#2WFQ7
/*Created on 2005-4-14*/ @ t|3gF$X
package org.flyware.util.page; BfVBywty
x=vK
EyS@
/** BUDGyl/=
* @author Joa X|Dpt2A=
* M}KZG'7
*/ ?S9Nm~vlt
publicclass Page { ;h9W\Se
W0|_]"K-
/** imply if the page has previous page */ tvT4S
privateboolean hasPrePage; B%mtp;) P
D:)~%wu Lt
/** imply if the page has next page */ OEI3eizgH
privateboolean hasNextPage; y;r"+bS8
#<]Iz'\`
/** the number of every page */ Wp`C:H
privateint everyPage; 3C#RjA-2[
zb?kpd}r
/** the total page number */ 2NYi-@mr
privateint totalPage; "qE {a>d
3(o7co-f
/** the number of current page */ fB7ljg
privateint currentPage; <5k&)EoT
F^miq^K=
/** the begin index of the records by the current DyIV/
;:?*t{r4#
query */ OW#_ty_ul
privateint beginIndex; y{92Lym
bM5CDzH(#X
lz}llLb1
/** The default constructor */ Pa[?L:E
public Page(){ p+)C$2YK
#@E(<Pu4`
} 4]EvT=Ro
0mVuD\#=!
/** construct the page by everyPage mtIMW9
* @param everyPage 0Nt%YP
* */ .*:h9AE7vo
public Page(int everyPage){ |,{+;:
this.everyPage = everyPage; 8m|x#*5fQl
} *W%'Di
y
qkX:jt
/** The whole constructor */ 7PA=)a\
public Page(boolean hasPrePage, boolean hasNextPage, qsTq*G
&1~Re.*B
H) cQO?B
int everyPage, int totalPage, *#6|!%?g
int currentPage, int beginIndex){ 2^J/6R$
this.hasPrePage = hasPrePage; 7N6zqjIB
this.hasNextPage = hasNextPage; hR0]8l|
this.everyPage = everyPage; r.?+gW!C
this.totalPage = totalPage; jzQ I>u
this.currentPage = currentPage; XHZLWh"gS
this.beginIndex = beginIndex; 8;0^'Qr8
} ~T7\8K+ $
7BS/T
/** H6{Rd+\Z
* @return QY=QQG
* Returns the beginIndex. ^(J-dK
*/ Cc*|Zw
publicint getBeginIndex(){ "raj>2@
return beginIndex; v =>3"!*
} y+= \z*9
ZRO.bMgZF
/** )Yrr%f`\
* @param beginIndex ..aK sSm(
* The beginIndex to set. }FZp840
*/ =uS8>.Qj
publicvoid setBeginIndex(int beginIndex){ TtZrttCE6
this.beginIndex = beginIndex; `!_? uT
} ^>eFm8`N
Nl=+.d6Qo
/** +yvBSpY
* @return yG4 MUf6
* Returns the currentPage. F;
0Dp
*/ #|q;t
publicint getCurrentPage(){ ,rXW`7!2
return currentPage; oR7 7`
} u$\Tg3du2
~O8]3+U
/** >H8^0n)?
* @param currentPage |]I#CdO
* The currentPage to set. ,d5ia4\K
*/
nMeS CX
publicvoid setCurrentPage(int currentPage){ I ;l`VtD
this.currentPage = currentPage; >" i~ x
} 2AmR(vVa"
(Y&R0jt
/** =w t-YM
* @return JLt{f=`%F
* Returns the everyPage. L-SdQTx_
*/ RR8U
Cv
publicint getEveryPage(){ 3EO#EYAHiM
return everyPage; Q:rT 9&G
} Xp.|.)Od
Y*"<@?n8?x
/** hY)YX,f=S
* @param everyPage \A~4\um
* The everyPage to set. =y`-sU Hx
*/ {XyG1
publicvoid setEveryPage(int everyPage){ EccFx7h
this.everyPage = everyPage; g}^4^88=a
} m79m{!q$-
S|tA[klh
/** ^j1Gmv)
* @return )_WH#-}
* Returns the hasNextPage.
sY&rbJ(P
*/ *pmoLiuB>
publicboolean getHasNextPage(){ 9.^-us1
return hasNextPage; U. NeK{
} MI?]8+l
qEPf-O:lm
/** A5`#Ot*3
* @param hasNextPage u)wu=z8
* The hasNextPage to set. k:@a[qnY
*/ 1i ?gvzrq
publicvoid setHasNextPage(boolean hasNextPage){ j@s=ER
this.hasNextPage = hasNextPage; &IxxDvP3k
} "bLP3
~y( ,EO
/** @fUX)zm>
* @return Ey
0>L
* Returns the hasPrePage. W5M
]
*/ XT\Td}>
publicboolean getHasPrePage(){ 'cWlY3%t
return hasPrePage; eYPt
} m/SJ4op$
,%&
LG],6
/** Aigcq38
* @param hasPrePage \>&@lA
* The hasPrePage to set. }mkA Hmu4
*/ q=(M!9cE
publicvoid setHasPrePage(boolean hasPrePage){ t"jIfU>'a/
this.hasPrePage = hasPrePage; EY=\C$3J:
} RI7qsm6RN
r! cNc
/** vy>];!Cu
* @return Returns the totalPage. +ytT)S
* AycA:<
*/ OLhWkN,qA
publicint getTotalPage(){ v)X[gt
tf
return totalPage; +-xSuR,
} 1_p[*h
h Kp,4D>2_
/** ^^20vwq
* @param totalPage )m$1al
* The totalPage to set. /1s 9;'I
*/ 3Y.d&Nz
publicvoid setTotalPage(int totalPage){ "H/2r]?GT
this.totalPage = totalPage; D~[N_
} w yuJSB
<lsi.x\y<
} rF
<iWM=
6z%&A]6k:
N?Z+zN&P
A,-[/Z K/
%FXI lH5
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 sYW1T @
4okHAv8;
个PageUtil,负责对Page对象进行构造: LrmtPnL
java代码: dT*f-W
8 RzF].)
v ](G?L9b
/*Created on 2005-4-14*/ |TNiKy
package org.flyware.util.page; &Nj:XX;X
=PeW$q+
import org.apache.commons.logging.Log; N7Z(lI|a;
import org.apache.commons.logging.LogFactory; .j+2x[`l
^Y*`D_-G
/** f6(9wz$Trt
* @author Joa O4'kS
@
* ?[*@T2Ck
*/ m,kvEQ3
publicclass PageUtil { 8xeun~e"vS
*R9mgv[
privatestaticfinal Log logger = LogFactory.getLog X7imUy'.
.lNnY8<
(PageUtil.class); 4`EvEv$i
GT1 X
/** !<['iM
* Use the origin page to create a new page ||"":K
* @param page gn4g 43
* @param totalRecords 7oqn;6<[>,
* @return T^-H_|/M
*/ ,i$(yx?
publicstatic Page createPage(Page page, int )KTWLr;
i85+p2i7
totalRecords){ Sf.8Ibw
return createPage(page.getEveryPage(), T{ v<