Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 -] `OaL!
>{eGSSG0
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 LLPbZ9q
HFW8x9Cc
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 v5 I}a7
P( 1Z
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 V5rW_X:]8
[&+5E1%L
。 S8Yti
vt(cC))
分页支持类: EttQ<z_T
;mwU>l,4
java代码: -J^t#R^$`
s!?T$@a=
lr9s`>9
package com.javaeye.common.util; >#|%y>g .o
PvW~EJ
import java.util.List; }TG=ZVi
=j~Xrytn
publicclass PaginationSupport { sEx`9_oZ
<nJ8%aY,
publicfinalstaticint PAGESIZE = 30; ]]50c
"p"~fN
/I9
privateint pageSize = PAGESIZE; lx&;?QQ
\s_`ZEB
privateList items; G$E+qk
nJL
}5=tUfh)]'
privateint totalCount; li&&[=6A
)BmO[AiOM
privateint[] indexes = newint[0]; p* tAwl
6MmkEU z
privateint startIndex = 0; %ql2 XAY
Pvz\zRq
public PaginationSupport(List items, int Y(C-o[-N
V?N8 ,)j
totalCount){ -$o4WSd~
setPageSize(PAGESIZE); oNp(GQ@0
setTotalCount(totalCount); Z?)=4|
setItems(items); CYZ0F5+t
setStartIndex(0); n0opb [ ?
} LIfYpn6
R_B`dP<"~Y
public PaginationSupport(List items, int A x'o|RE)x
#L9F\ <K
totalCount, int startIndex){ [)t1"
setPageSize(PAGESIZE); L(DDyA{bA
setTotalCount(totalCount); Rp_)LA
setItems(items); !+T29QYK8
setStartIndex(startIndex); ~'#,*kA:6
} N_R(i3c6U!
lFbf9s:$B
public PaginationSupport(List items, int Jq_AR!} %
FwqaWEk
totalCount, int pageSize, int startIndex){ WO{ET
setPageSize(pageSize); evGUl~</~
setTotalCount(totalCount); >6A8+=
setItems(items); 48RSuH
setStartIndex(startIndex); rvp#[RAaS}
} [xH Hm5$
MhZ\]CAs9
publicList getItems(){ d#-'DO{k
return items; %IK[d#HO
} Yqb3g(0
=jkiM_<h
publicvoid setItems(List items){ ;Miag'7
this.items = items; !M;><b}=5
} >wf.C%
\&b1%Asyz
publicint getPageSize(){ P;
9{;
return pageSize; 1i/&t[
} UB,:won
a}[ 1*_G
publicvoid setPageSize(int pageSize){ @k3xk1*
this.pageSize = pageSize; T[ltOQw?Y
} PAS0 D
#
90UZ\{">
publicint getTotalCount(){ .A
apO}{
return totalCount; `XrF ,
} :EV*8{:aLU
-d_7 q
publicvoid setTotalCount(int totalCount){ n>W*y|UJ
if(totalCount > 0){ Xhp={p;
this.totalCount = totalCount; ^~7ouA
int count = totalCount / 9z kRwrQ
]4eIhj?
pageSize; Eh&-b6:
if(totalCount % pageSize > 0) ~zhP[qA})
count++; PIM4c
indexes = newint[count]; % 9} ?*U
for(int i = 0; i < count; i++){ DE!c+s_g4
indexes = pageSize * }fh<L CwTi
T.pc3+B8N
i; THY=8&x)
} Y>Fh<"A|$
}else{ 2k M;7:
this.totalCount = 0; Eal*){"<,?
} \^x`GsVy
} ,racmxnv
kV:T2}]|H
publicint[] getIndexes(){ RiiwsnjC
return indexes; P@FE3g
} !![HR6"Q
?g9oiOhnG
publicvoid setIndexes(int[] indexes){ pB'{_{8aA
this.indexes = indexes; X ;Cl8
} /Jf}~}JP
Jsf"h-)P
publicint getStartIndex(){ SaFNPnk=
return startIndex; 9i+.iuE%Bu
} JVR,Py:%G
|syvtS{
publicvoid setStartIndex(int startIndex){ Ot;)zft
if(totalCount <= 0) /@Ec[4^=!.
this.startIndex = 0; JS^!XB'!
elseif(startIndex >= totalCount) `rb}"V+
this.startIndex = indexes fVz0H1\J&
8c%_R23
[indexes.length - 1]; #j4RX:T*[
elseif(startIndex < 0) &vN^*:Q
this.startIndex = 0; S#*aB2ZS
else{ N"A`tc5&
this.startIndex = indexes w\y)
<op|yh3Jkk
[startIndex / pageSize]; w7Ij=!)
} qaG8:
} dy3fZ(=q^
gN.n_!
publicint getNextIndex(){ c'
Q4Fzj0'
int nextIndex = getStartIndex() + om2)Cd9~7
E7 P'}
pageSize; d~#:t~
$,
if(nextIndex >= totalCount) ;k
(M4?
return getStartIndex(); A,4Z{f83
else -+y3~^EYm,
return nextIndex; `J%35
} AmB*4p5b
jIck!
publicint getPreviousIndex(){ b<j*;n.
int previousIndex = getStartIndex() - !md1~g$rN
v]y=+* A
pageSize; y wmC>`0p
if(previousIndex < 0) [:8+ +#KD
return0; ),XDY_9K
else rmeGk&*R8
return previousIndex; v9"03=h
} +LF`ZXe8l
@T%8EiV
} B-h@\y
B^Hhrz!
xu.TS
O% 8>siU
抽象业务类 Lum5Va%0
java代码: %xdyGAl:
WHcw5_3#
v;(k7
/** Bhk@0\a
* Created on 2005-7-12 <OTx79m
*/ O?0`QMY
package com.javaeye.common.business; q
+!i6!6r
c~u91h?
import java.io.Serializable; !M}ZK(
import java.util.List; YL/B7^fd8
IHv>V9yiG
import org.hibernate.Criteria; t:YMF$Z
import org.hibernate.HibernateException; KM/c^a4V
import org.hibernate.Session; ufJHC06
import org.hibernate.criterion.DetachedCriteria; q<Y#-Io%3
import org.hibernate.criterion.Projections; |%@pjJ`3
import P52qt N<
#9t3 <H[
org.springframework.orm.hibernate3.HibernateCallback; FiKGB\_]
import |Q$Dj!!1P
bzh:
org.springframework.orm.hibernate3.support.HibernateDaoS )!Zm*(
lsU`~3nr
upport; { a_&L
2E0oLl[
import com.javaeye.common.util.PaginationSupport; D~)bAPAD
hVh,\d&2t
public abstract class AbstractManager extends krRnE7\m
, 8o
Y(h
HibernateDaoSupport { IU\h,Ug
C0W-}H
privateboolean cacheQueries = false; E.G]T#wt0
|a=7P
privateString queryCacheRegion; {T 3~js
hbm#H7Y
publicvoid setCacheQueries(boolean B1TWOl?d{
?~ <NyJHN%
cacheQueries){ ]{18-=
this.cacheQueries = cacheQueries; x!fgZr{
} Esf\Bo"
T=':$(t
publicvoid setQueryCacheRegion(String gw<udhk
P>'29$1'
queryCacheRegion){ lQpl8>
this.queryCacheRegion = 4xgfm.9I^
vw
:&c.zd
queryCacheRegion; !ezy
v`
} Ks-$([_F
zGa
V^X
publicvoid save(finalObject entity){ ,,;vG6^a
getHibernateTemplate().save(entity); NG?g(
} T>w;M?`9K
8Yf=)
publicvoid persist(finalObject entity){ cC9haxW
getHibernateTemplate().save(entity); DK1{Z;Z
} %rO)w?
0~e6\7={
publicvoid update(finalObject entity){ Ehq
[4}
getHibernateTemplate().update(entity); |OIU)53A-
} Se>v|6
h]&o)%{4
publicvoid delete(finalObject entity){ _7
^:1i~:.
getHibernateTemplate().delete(entity); <(l`zLf4p
} YwZ]J
[= Xb*~
publicObject load(finalClass entity, IGo+O*dMw
Jt3*(+J>/
finalSerializable id){ 8d(l)[GZt
return getHibernateTemplate().load Dlz1"|SF
}j{Z
&(K
(entity, id); "p[3^<~uQ
} Y)7\h:LIg
DS ;.)P"
publicObject get(finalClass entity, W&7(
goc; .~?
finalSerializable id){ eQ<GNvm
return getHibernateTemplate().get .M0pb^M
bSa]={}L(
(entity, id); <t dsUh:?&
} Kxi@"<`S
63kZ#5g(Dw
publicList findAll(finalClass entity){ TjOK8
t
return getHibernateTemplate().find("from rq:sy=;
`:Zgq+j&
" + entity.getName()); 3|D .r-Q
} f{h2>nEj\
v.c.5@%%o
publicList findByNamedQuery(finalString *S'?u_Y7
a0's6C
namedQuery){ 4)Ew
rU
return getHibernateTemplate qoEZ>
.x1.` Y
().findByNamedQuery(namedQuery); tg7QX/KX
} _ o==
9/{ 8Y&
publicList findByNamedQuery(finalString query, A@e!~
u/%Z0`X
finalObject parameter){ a\KM^jrCD
return getHibernateTemplate
p]jG
,S
(&M,rW~Qxs
().findByNamedQuery(query, parameter); GN+!o($
} d w'P =8d
\_7'f
publicList findByNamedQuery(finalString query, '
?a d
\vE-;,
finalObject[] parameters){ v!AfIcEV
return getHibernateTemplate Yn>FSq^Wp-
u]P9ip"Z
().findByNamedQuery(query, parameters); $?On,U
} y:k7eE"
\W|ymV_Ki
publicList find(finalString query){ \/9 O5`u*V
return getHibernateTemplate().find o;>qsn8
+ZkJ{r0,(
(query); IiV]lxiE]
} QT4vjz+|
6t gq.XL^n
publicList find(finalString query, finalObject a!.Y@o5Ku
k=X)axt1
parameter){ q[x|tO
return getHibernateTemplate().find *r ('A
XII',&
(query, parameter); rd,!-w5
} P`y.3aK
KBA&s
public PaginationSupport findPageByCriteria xPJ@!ks9
10_>EY`
(final DetachedCriteria detachedCriteria){ OX [r\
return findPageByCriteria >AWWwq -
D8`SI21P
(detachedCriteria, PaginationSupport.PAGESIZE, 0); Nj +^;Y
} DIgur}q)@
A(z
m
public PaginationSupport findPageByCriteria QiaBZAol
9TEAM<b;
(final DetachedCriteria detachedCriteria, finalint J\Tu=f)
>^g\s]c[
startIndex){ .-1'#Z1T
return findPageByCriteria 4}0Ry\
6
eTI?Mu>C
(detachedCriteria, PaginationSupport.PAGESIZE, Ac\e>N
r+tHVh
startIndex); i0~Af`v
} $p*.[)
M2nUY`%#v
public PaginationSupport findPageByCriteria w`atk=K
*P?Rucg
(final DetachedCriteria detachedCriteria, finalint 28j/K=0(
vZPBjloT!.
pageSize, WsT
finalint startIndex){ Dy{lgT 0k
return(PaginationSupport) j%gle%_
hb1eEn
getHibernateTemplate().execute(new HibernateCallback(){ w,t !<i
publicObject doInHibernate v3wq-
|g"K7XfM4
(Session session)throws HibernateException { biRkqc;
Criteria criteria = ADA}_|O
CW FE{
detachedCriteria.getExecutableCriteria(session); ),2|TlQ
int totalCount = 8_M"lU0[
FLIU}doc
((Integer) criteria.setProjection(Projections.rowCount 'ZAIe7i&
KLjvPT\
()).uniqueResult()).intValue(); \/-4 jF:
criteria.setProjection *]c~[&x5&
NMzq10M=6
(null); ssl.Y!
List items = :.(A,
F6_en z
criteria.setFirstResult(startIndex).setMaxResults pDcGf7
spWo{
(pageSize).list(); 77'@U(
PaginationSupport ps = YR[I,j
9xeg,#1
new PaginationSupport(items, totalCount, pageSize, gOMy8w4>
[MF&x9Ss?%
startIndex); GtKSA#oYZB
return ps; :Xu9`5
} Kd*=-
}, true); lBudC
} z6|kEc"{
YUTI)&y
public List findAllByCriteria(final +K,T^<F;
7tne/Yz
DetachedCriteria detachedCriteria){ w"L]?#
return(List) getHibernateTemplate #X0Xc2}{f
_/YM@%d
().execute(new HibernateCallback(){ u1>WG?/`
publicObject doInHibernate b&'YW*W
~.z82m
(Session session)throws HibernateException { 7c8`D;A-K
Criteria criteria = y[GqV_~?Y
lUw=YM
detachedCriteria.getExecutableCriteria(session); IuMJ-"
return criteria.list(); t_+owiF)M
} B_RF)meux
}, true); &ViK9
} lHE \Z`
R0K{wY58
public int getCountByCriteria(final AEUR`.
ZuKOscVS#T
DetachedCriteria detachedCriteria){ OF,_6"m
Integer count = (Integer) COj^pdE3
;WgzR_'!'
getHibernateTemplate().execute(new HibernateCallback(){ EAz>`~
publicObject doInHibernate fP 3t0cp
PJ,G_+b!
(Session session)throws HibernateException { (-VH=,Md
Criteria criteria = dJ>tM'G
3,J{!
detachedCriteria.getExecutableCriteria(session); 40[@d
return \Qq YH^M
'r1X6?dJ
criteria.setProjection(Projections.rowCount /?a9g>G%N
Ml/K~H
tN
()).uniqueResult(); y( UWh4?t
} ,rOh*ebF
}, true); 5?|y%YH;R\
return count.intValue(); @\+UTkl8
} |nU%H=Rs/
} U*XdFH}vV
r4fd@<=g
SJE!14|e
h!tg+9%
}N:QB}7'_
XW+-E^d
用户在web层构造查询条件detachedCriteria,和可选的 ,V''?@
IDdu2HNu
startIndex,调用业务bean的相应findByCriteria方法,返回一个 R<^E?FI
ReGT*+UN
PaginationSupport的实例ps。 TQOJN
?"kU+tCxg
ps.getItems()得到已分页好的结果集 5!jt^i]O
ps.getIndexes()得到分页索引的数组 s !II}'Je
ps.getTotalCount()得到总结果数 bPMf='F{r
ps.getStartIndex()当前分页索引 SQN{/")T
ps.getNextIndex()下一页索引 <~e*YrJ?-
ps.getPreviousIndex()上一页索引 5f75r
hTPvt
%D7 '7E8.
cW?6Iao
4-9cp=\PE
"&\(:#L
\aN5:Yy
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 BWr!K5w>i
@P[%6 d
,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 mS.!lkV
Ds@K%f(.?w
一下代码重构了。 B5_QH8kt7
ssmJ?sl
我把原本我的做法也提供出来供大家讨论吧: qj^A
w1
A-_
首先,为了实现分页查询,我封装了一个Page类: }IQ! [T5
java代码: [geT u
|7.X)h`
Z*(OcQ-
/*Created on 2005-4-14*/ bNoZ{ 7
package org.flyware.util.page; w)h"?'m~
QwuSo{G
/** Ko
"JH=<
* @author Joa \?^ EFA+;
* S)"vyGv
*/ s}DNu<"g
publicclass Page { NkQain9
l a_
/** imply if the page has previous page */ L>N)[;|
privateboolean hasPrePage; R5 EC/@
v4\
m9Pu4
/** imply if the page has next page */ Ey_mK\'
privateboolean hasNextPage; S-brV\v7
buHUBn[3)
/** the number of every page */ !H @nAz
privateint everyPage; UaHN*@
fUJe{C<H
/** the total page number */ 5!6}g<z&L
privateint totalPage; f%REN3=5K
GB}X
/** the number of current page */ g}vU*g
;
privateint currentPage; wD@ wOC
$:?=A5ttuo
/** the begin index of the records by the current %F<3_#Y
t'C9;
query */ N9z!-y'X
privateint beginIndex;
K81&BVx/
+ Cq&~<B
/FcwsD\=$
/** The default constructor */ `$/M\aM%
public Page(){ U*T :p>&
Kn\$\?u
} ,- _ReL
J^Wqa$<;"
/** construct the page by everyPage OW8TiM
mK
* @param everyPage ; d}
* */ ;bq
EfV0`2
public Page(int everyPage){ hiaTJE|J?
this.everyPage = everyPage; ;kVo? W]
} pf0uwXo
>
!HC
?
/** The whole constructor */ =gSACDTc
public Page(boolean hasPrePage, boolean hasNextPage, ry4:i4/[
>*}m.'u
dw7h@9\y
int everyPage, int totalPage, {7=k/Y*U
int currentPage, int beginIndex){ `UkPXCC\1
this.hasPrePage = hasPrePage; EtcXzq>w
this.hasNextPage = hasNextPage; v2mqM5Z
this.everyPage = everyPage; BFn}~\wzK
this.totalPage = totalPage; ?=?9a
this.currentPage = currentPage; yF^)H{yx
this.beginIndex = beginIndex; opCQ=G1
} AOCiIPw
dr4 m}v.
/** E+eC #!&w
* @return 2V*<J:;wb
* Returns the beginIndex. l3kBt-m
*/ l`{JxVg
publicint getBeginIndex(){ Oi n:5K)4-
return beginIndex; r}t%DH
} uC1v^!D
Y FW0
/** %W$?*Tm
* @param beginIndex ?^:
xNRE$j
* The beginIndex to set. ` ln=D$
*/ pB,@<\l %
publicvoid setBeginIndex(int beginIndex){ iS28p
this.beginIndex = beginIndex; }5ONDg(I~
} 3a,7lTUuB
hfQ^C6yR
/** wW^3/
* @return C#.d
sl
* Returns the currentPage. Lmyw[s\U
*/ 1
BVpv7@
publicint getCurrentPage(){ ;#?+i`9'q
return currentPage; f@IL2DL}\
} GSg/I.)S
N~M-|^L
/** VW9BQs2w
* @param currentPage YZ+<+`Mz<
* The currentPage to set. f.u[!T
*/ K7d]p0d'
publicvoid setCurrentPage(int currentPage){ e+O0l
this.currentPage = currentPage; Jm
G)=$,
} u|E9X[%
5,WDmhJ
/** m2Q#ATLW
* @return ,vUMy&AV
* Returns the everyPage. n!\&X9%[8
*/ i52:<<