Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 kMo)4Xp
5^dw!^d
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 h$&XQq0T
}rE|\p>
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 GEA;9TU|V
M($},xAvDU
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 >
95Cs`>d
i/~J0qQ
。 P Cf|^X#B
A-io-P7qyj
分页支持类: NIfc/%
#dft-23
java代码: =<05PB
_:L*{=N
K)?^b|D
package com.javaeye.common.util; xD=D *W
rYJ))@
import java.util.List; JdHc'WtS!|
,gvX ~k
publicclass PaginationSupport { ie!4z34
W!k6qTz)
publicfinalstaticint PAGESIZE = 30; }D^Gt)
#+;=ijyF
privateint pageSize = PAGESIZE; taQ[>x7b
T_uuFL
privateList items; 7|-xM>L$A
$ZRN#x@
privateint totalCount; zEW:Xe)
fq|2E&&v
privateint[] indexes = newint[0]; _&/Zab5
eFQi
K6`i
privateint startIndex = 0; 4Le5Ms/
Z|c9%.,
public PaginationSupport(List items, int yLx.*I^6
[q&J"dt
totalCount){ q,DX{:
setPageSize(PAGESIZE); dX*>?a
setTotalCount(totalCount); LXLDu2/@
setItems(items); 2YKM9Ks
setStartIndex(0); SDIeq
} 1l_}O1
-G;1U
public PaginationSupport(List items, int Xoy 1Gi?
zq.&Mw?
totalCount, int startIndex){ ]3xa{h~4
setPageSize(PAGESIZE); dYd~9
setTotalCount(totalCount); WDdi}i>2
setItems(items); E/ZJ\@gzD
setStartIndex(startIndex); lF(!(>YZ
} /wE_eK.
Lf#G?]@
public PaginationSupport(List items, int _6!/}Fm
aS vE
totalCount, int pageSize, int startIndex){ shT[|@"C
setPageSize(pageSize); >@U<?wP
setTotalCount(totalCount); <o+
7U
setItems(items); 0JNOFX
setStartIndex(startIndex); +c a296^
} -ZP&zOsDr
%g&,]=W\N
publicList getItems(){ b3xkJ&Z
return items; j/D)UWkR
} 8>Z$/1Mh
P(epG?Qg
publicvoid setItems(List items){ rfRo*u2"
this.items = items; Vb^s 'k
} }+
2"?f|]
O&w3@9KJ?
publicint getPageSize(){ {@5WeWlz~
return pageSize; cWO
)QIE
} TRLeZ0EC
t`T\d\
publicvoid setPageSize(int pageSize){ `^L<db^A
this.pageSize = pageSize; \>Rwg=Lh
} .)>/!|i
N&APqT
publicint getTotalCount(){ {(}w4.!
return totalCount; Y@H,Lk
} I`W-RWZ
g[au-.:
publicvoid setTotalCount(int totalCount){ yvWzc
uL#
if(totalCount > 0){ 0DB<hpC:5
this.totalCount = totalCount; : .o=F`W
int count = totalCount / =jIT"rk
V`,[=u?c
pageSize; hlFU"u_
if(totalCount % pageSize > 0) R}w wC[{
count++; d Zz^9:C+
indexes = newint[count]; 9/daRq$
for(int i = 0; i < count; i++){ qM>OE8c#/
indexes = pageSize * {O kik}Oh
o+-Ge
J
i; >|/? Up
} on;sq8;
}else{ fsJTwSI["
this.totalCount = 0; # )mkD4
} [gkRXP[DGs
} A
Ok7G?Y
h0GdFWN
publicint[] getIndexes(){ z]l-?>Zbg
return indexes; V87ee,
} ,eeL5V
+%}5{lu_e
publicvoid setIndexes(int[] indexes){ ?PE1aB+{:
this.indexes = indexes; IEoR7:
} ;}eEG{`Y
>\7RIy3
publicint getStartIndex(){ &lh_-@Xz
return startIndex; |:=b9kv
} !|<f%UO
*K jVPs
publicvoid setStartIndex(int startIndex){ pmW6~%}*
if(totalCount <= 0) t6bWSz0
this.startIndex = 0; I0l.KiBm
elseif(startIndex >= totalCount) xeYySM=
this.startIndex = indexes h w ;d m
*T>#zR{
[indexes.length - 1]; =!S@tuY
elseif(startIndex < 0) ADyNNMcx
this.startIndex = 0; Tt <-<oyU.
else{ _WDBG
this.startIndex = indexes 0J:U\S
m{lRFKx>s
[startIndex / pageSize]; h"BhTx7E}
} &Qq/Xi,bZ
} VJl &Bq+
/2_B$
publicint getNextIndex(){ >OKS/(I0
int nextIndex = getStartIndex() + *]:G7SW{
+A'q#~yILa
pageSize; Jl}!CE@-
if(nextIndex >= totalCount) |,a%z-l
return getStartIndex(); LTYuxZ
else
il IV}8
return nextIndex; !QQ<Ai!E
} k\Z;Cmh>
neB.Wu~WH
publicint getPreviousIndex(){ +2V%'{:
int previousIndex = getStartIndex() - \}u7T[R=`
Owh*KY:
pageSize; igRDt{}
if(previousIndex < 0) ^i`3cCFB<
return0; E2q B:
else z6FbM^;;
return previousIndex; Pa+AF
} #"o6OEy$A#
f
$.\o
} KMpDlit
np`gcj#
k5fH;
f0cYvL]
抽象业务类 }P&1s,S8J#
java代码: 2[8fFo>
U5On-T5
U9@t?j_#X{
/** Lem\UD$D`
* Created on 2005-7-12 (:&&;]sI
*/ X|-v0 f
package com.javaeye.common.business; (5Z8zNH`3
\]f5
import java.io.Serializable; Ersr\ZB
import java.util.List; SgCqxFii
w|
-0@
import org.hibernate.Criteria; r21?c|IP
import org.hibernate.HibernateException; rnMG0
import org.hibernate.Session; Xa{~a3Wy
import org.hibernate.criterion.DetachedCriteria; ONr?.MJ6j
import org.hibernate.criterion.Projections; nxn[ ~~
import ?8wwd!)x%
.*RB~c
t
org.springframework.orm.hibernate3.HibernateCallback;
F1?CqN M
import Ks49$w<
d$"G1u~%
org.springframework.orm.hibernate3.support.HibernateDaoS .KiPNTh'
B%%.@[o,
upport; -(/2_&"
3D?IG\3
import com.javaeye.common.util.PaginationSupport; :Bx+WW&P.i
dDv{9D,
public abstract class AbstractManager extends O:`GL1{ve?
RQj`9F
HibernateDaoSupport { E(aX4^]g
" ;-{~
privateboolean cacheQueries = false; */%$6s~
$I)Tk`=
privateString queryCacheRegion; V!pq,!C$v
gD,YQ%aq
publicvoid setCacheQueries(boolean oglXW8
Vr&el
cacheQueries){ RR[)UQ
this.cacheQueries = cacheQueries; vpeq:h
} vKU]80T
S 0R8'Y
publicvoid setQueryCacheRegion(String [Vrc:%Jk
g^s+C Z
queryCacheRegion){ wq:b j=j
this.queryCacheRegion = M(;y~|e
['51FulDR
queryCacheRegion; $?]@_=
} F9m 2C'U
tl{]gz
publicvoid save(finalObject entity){ ql!5m\
getHibernateTemplate().save(entity); p/ziFpU
} '\ph`Run
8_^'(]
publicvoid persist(finalObject entity){ -vv
getHibernateTemplate().save(entity); $:%*gY4~76
} iN:G/ss4O
T!m42EvIvE
publicvoid update(finalObject entity){ $\0cJCQ3
getHibernateTemplate().update(entity); jHkyF`<+
} fap|SMGt
MAuM)8_P/|
publicvoid delete(finalObject entity){ ppwd-^f3j
getHibernateTemplate().delete(entity); w$DG=!
} ]yyU)V0Iu
rtB|N-
publicObject load(finalClass entity, +l2e[P+qA
/p"U
finalSerializable id){ +L`V[;
return getHibernateTemplate().load B8bvp:Ho|
HO266M
(entity, id); 89*S?C1
} bh= \
Tjd&^m
publicObject get(finalClass entity, [=XZza.z
v;)BVv
finalSerializable id){ <ldid]o
#
return getHibernateTemplate().get c+szU}(f6(
gzl%5`DB w
(entity, id); ^z[_U}N\}
} ox(*
sl~b\j
publicList findAll(finalClass entity){ WafdE
return getHibernateTemplate().find("from Q;XXgX#l
3mpP|b"
" + entity.getName()); R19'|TJ
} .LX?VD
%3]3r*e&5
publicList findByNamedQuery(finalString Sp<hai
1zdYBb6;j
namedQuery){ \1=T
sU&^
return getHibernateTemplate rER~P\-
f2uZK!:m
().findByNamedQuery(namedQuery); UqD5
A~w
} fdd~e52f
PLO\L W
publicList findByNamedQuery(finalString query, "F&Tnhh4
LTg?5GwD\j
finalObject parameter){ \ua9thOG
return getHibernateTemplate kFS0i%Sr
j FgZ}Xp
().findByNamedQuery(query, parameter); cNdu.c[@
} }=Hf?';m
IetCMp
publicList findByNamedQuery(finalString query, z
VnIr<!8_
S/a/1n$ U
finalObject[] parameters){ c}YJqhk0J
return getHibernateTemplate XZF%0g2$b
ILNE 4n
().findByNamedQuery(query, parameters); }j&O/Up
} -Bl/4p
"\NF
publicList find(finalString query){ OpYmTep#T\
return getHibernateTemplate().find -sP9E|/:'3
[vE$R@TZ0!
(query); D*|(
p6v1&
} -s{R/ 6:
[Dnusp7e
publicList find(finalString query, finalObject (&q@~
dJ
w#W5}i&x
parameter){ }'u3U"9)
return getHibernateTemplate().find |__d 8a
H!p!sn
(query, parameter); O:2 #_
} Tsu\oJ[
b21}49bHN
public PaginationSupport findPageByCriteria y@q1c*|
QxKAXq@)i
(final DetachedCriteria detachedCriteria){ [.M
return findPageByCriteria
Q{O/xLf
;9K[~
(detachedCriteria, PaginationSupport.PAGESIZE, 0); IoQr+:_R
} ggMUdlU
&Y 'z?N
public PaginationSupport findPageByCriteria sc<kiL
A8J?A#R*{q
(final DetachedCriteria detachedCriteria, finalint ',DeP>'%>
Xu6jHJ@ x
startIndex){ JFe4/
V
return findPageByCriteria <|otZJ'2r
!
&y
(detachedCriteria, PaginationSupport.PAGESIZE, [qSQ#Qzi2i
k9cK bf@
startIndex); $$42pb.
} m{VL\ g)
SF0Jb"kS
public PaginationSupport findPageByCriteria m^z,,t9
/;+oz
(final DetachedCriteria detachedCriteria, finalint `Rrr>vj
0"hiCGm'
pageSize, ma3Qi/
finalint startIndex){ O!o <P5X^
return(PaginationSupport) :#qUMiu$
dZF8R
getHibernateTemplate().execute(new HibernateCallback(){ \Ph]*%
publicObject doInHibernate I I&<
5qGGu.$Ihi
(Session session)throws HibernateException { "=FIFf
Criteria criteria = anLbl#UV
Q<dba12
detachedCriteria.getExecutableCriteria(session); "X`Qe!zk4
int totalCount = vnDmFqelz
4yhcK&
((Integer) criteria.setProjection(Projections.rowCount qZ#!CPHS
: sFo
()).uniqueResult()).intValue(); qv.n9 9?]
criteria.setProjection 0"4J"q]&
5H~@^!7t
(null); >;m{{nj
List items = (:JjQ`i
Ln:lC(
'
criteria.setFirstResult(startIndex).setMaxResults 0Qt~K#mr/
iW'_R{)T
(pageSize).list(); #T[%6(QW
PaginationSupport ps = v C^>p5F
ci;&CHa
new PaginationSupport(items, totalCount, pageSize, _n7%df
h:_NA
startIndex); %S c=_%6
return ps; WBa /IM
} xwi!:PAf,o
}, true); R<>tDwsZGa
} a`s/ qi
KA?v.s
public List findAllByCriteria(final G<|:605
7O"hiDQ
DetachedCriteria detachedCriteria){ &h\7^=s.
return(List) getHibernateTemplate _OLI%o
_nP)uU$
().execute(new HibernateCallback(){ 3\]~!;dI
publicObject doInHibernate Y^yG/F
|ebvx?\
(Session session)throws HibernateException { yYg
Criteria criteria = 5 1"8Py
E3bwyK!s
detachedCriteria.getExecutableCriteria(session); X`D+jiQ(f
return criteria.list(); loLKm]yV
} }Iip+URG
}, true); ,2,W^HJ
} j|k@MfA
O hi D
public int getCountByCriteria(final +3)[>{~1Z
QsM*wT&aa
DetachedCriteria detachedCriteria){ IEc>.J|T&
Integer count = (Integer) 4aA9\\hfGY
moaodmt]x
getHibernateTemplate().execute(new HibernateCallback(){ Wy8,<K{
publicObject doInHibernate 1c/
X
p+vh[+yp
(Session session)throws HibernateException { C>NQ-w^
Criteria criteria = oikxg!0S
D@:"f?K>
detachedCriteria.getExecutableCriteria(session); t|<FA#
return q#jEv- j.
JS PW>W"
criteria.setProjection(Projections.rowCount .8:+MW/
i2`#
()).uniqueResult(); "U*5Z:8?9
} y)tYSTJK
}, true); I.-v?1>,
return count.intValue(); UTvs
|[
} !D7"=G}HD
} $M39 #a
:,47rN,qa
@ R UP$
UDMyyVd
4j{oaey
y #69|G
用户在web层构造查询条件detachedCriteria,和可选的 <>n9'i1
qrpb[)Ll
startIndex,调用业务bean的相应findByCriteria方法,返回一个 f0u56I9
4
A5t*e
PaginationSupport的实例ps。 Oi6Eo~\f
5tMh/]IeS
ps.getItems()得到已分页好的结果集 $HxS:3D%D
ps.getIndexes()得到分页索引的数组 JdO)YlM-
ps.getTotalCount()得到总结果数 GY9y9HNZ
ps.getStartIndex()当前分页索引 KXq_K:r?
ps.getNextIndex()下一页索引 i+1Qf
ps.getPreviousIndex()上一页索引 .>wFztK
+v!v[qn
Hsgy'X%om
TOrMXcn!/
!VFem~'d
aiJnfU]W
bs
BZE
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Li]k7w?H
O2% ` 2h
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 \q,s?`+B
>J@egIKzP
一下代码重构了。 05"qi6tncz
g}m+f]|
我把原本我的做法也提供出来供大家讨论吧: VyY.r#@
yjFe'
首先,为了实现分页查询,我封装了一个Page类: WcU@~05b
java代码: QkL@JF]Re
@iRO7 6m
HitAc8
/*Created on 2005-4-14*/ 4#7Umj
package org.flyware.util.page; 9qre|AA
|by@ :@*y
/** /p 5=i
* @author Joa !)nD xM`p
* >D~w}z/fk
*/ @/ k x
er
publicclass Page { {@45?L('
'#<> "|
/** imply if the page has previous page */ PtqGX=u
privateboolean hasPrePage; ]L8q
'W(xgOP1
/** imply if the page has next page */ (AuPZ
privateboolean hasNextPage; "S(yZ6r"
p-Pz=Cx-
/** the number of every page */ [;FofuZ
privateint everyPage; ?@DNsVwb
nj
/** the total page number */ E(;i>
privateint totalPage; ??(Kwtx{
qv uxhz F
/** the number of current page */ &[~[~m|
privateint currentPage; `.8UKSH+
V^2-_V]8
/** the begin index of the records by the current \K}aQKB/j
8YKQItK
query */ o:9$UV[
privateint beginIndex; B2(,~^39
b2s~%}T
s7"i.A
/** The default constructor */ Z/7dg-$?'0
public Page(){ I="oxf#q
PQ3h\CL1n
} dyO E6Ex
fI]b zv;
/** construct the page by everyPage qtY
m!g
* @param everyPage \8>oJR 6
* */ 6c &Y
public Page(int everyPage){ Yf=FeH7"
this.everyPage = everyPage; h)@InYwu7
} J=9 #mOcg"
R04J3D|
/** The whole constructor */ > 0T
Za
public Page(boolean hasPrePage, boolean hasNextPage, SX_4=^
H(&Z:{L
t!t=|JNf{
int everyPage, int totalPage, 6v>z h
int currentPage, int beginIndex){ \igaQ\~
this.hasPrePage = hasPrePage; oCuV9dA.
this.hasNextPage = hasNextPage; `pm>'
this.everyPage = everyPage; ;RHNRVP
this.totalPage = totalPage; e "n|jRh
this.currentPage = currentPage; v ):V
this.beginIndex = beginIndex; RHI&j~
} 3\+N`!
N,|r1u 9X#
/** A?,A(-0C
* @return $:;%bjSI
* Returns the beginIndex. l[*sHi
*/ rN#\AN
publicint getBeginIndex(){ a:}E& ,&M
return beginIndex; mgcN( n1
} 2*Q3.2 Z
Y&GuDLUF
/** ,C:o`fQ\
* @param beginIndex $3#%aA!(#
* The beginIndex to set. C{&)(#*L
*/ K'Spbn!nC
publicvoid setBeginIndex(int beginIndex){ Ue! Q. "
this.beginIndex = beginIndex; v20~^gKo=m
} P7r4ePtLk{
$
S~%Ks C
/** ET+'Pj3
* @return ox4W$YdMG
* Returns the currentPage. Rsn^eR6^
*/ Nv3tt
publicint getCurrentPage(){ *~;8N|4<
return currentPage; :\bfGSD/gd
} {:)vwUe{
3]`mQm E
/** /buWAX1
* @param currentPage 7Ud'd<
* The currentPage to set. fnOIv#
*/ j)";:v
publicvoid setCurrentPage(int currentPage){ c,$mWTC
this.currentPage = currentPage; WjOH/$(
} "teyi"U+
'=#5(O%pp
/** O9e.=l
* @return Abf1"#YImy
* Returns the everyPage. GX5W^//}
*/ liD47}+
publicint getEveryPage(){ gn.Ol/6D
return everyPage; (I~\,[
} )eq}MaW+j
H&K3"Ulw
/** 85hQk+Bu4
* @param everyPage 0x71%=4H^x
* The everyPage to set. y||@?Y
*/ :o$@F-$k
publicvoid setEveryPage(int everyPage){ t'aSF{%
this.everyPage = everyPage; "kr,x3
=
} vgo{]:Aj{
Mz\yPT;Y
/** )!a$#"'
* @return ^aptLJF
* Returns the hasNextPage. D 'n7&