Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 +j14Q$
pKG<Nvgz&
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 3>M&D20Z
!U%T&?E l
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 >w6taX
fh8j2S9J
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 s"KJiQKGM
),:c+~@@kT
。 Gbpw5n;e
rZXrT}Xh{W
分页支持类: 2S[-$9
bPKOw<
java代码: y]
oaO+
cf_|nL#9
x3+oAb@o/
package com.javaeye.common.util; d~J-|yyT
Hy:V`>
import java.util.List; B5%n(,Lx
72uz<i!&$
publicclass PaginationSupport { 2-*V=El
q/9H..6
publicfinalstaticint PAGESIZE = 30; ^ <`(lyph
Jb_1LZ)]
privateint pageSize = PAGESIZE; `O?T.p)
Uh
eC
privateList items; oTjyN\?H
:(|'S4z
privateint totalCount; E_z;s3AXQ
@oP_;G
privateint[] indexes = newint[0]; #65^w=Sp}
{@Yb%{+
privateint startIndex = 0; DB526O*
[
6Q&r0>^{
public PaginationSupport(List items, int WS8+7O'1\
\2-@' ^i
totalCount){ N;oQ^B'
setPageSize(PAGESIZE); xiF7}]d+
setTotalCount(totalCount); AI vXb\wL
setItems(items); POI.]1i
setStartIndex(0); :,12")N
} %q;jVj[
g:l.MJT
public PaginationSupport(List items, int 1F8 W9b^D
IzOYduJ.
totalCount, int startIndex){ 4BYE1fUzd
setPageSize(PAGESIZE); 3f Xv4R;!:
setTotalCount(totalCount); \`V$
'B{.
setItems(items);
'7Nr8D4L
setStartIndex(startIndex); Y/<lWbj*A
} '+>fFM,*B
F7L &=K$2y
public PaginationSupport(List items, int 7M_U2cd|TD
gbeghLP[?
totalCount, int pageSize, int startIndex){ YpAg
setPageSize(pageSize); |'ln?D:&
setTotalCount(totalCount); n6d9\
setItems(items); WW2Ob*
setStartIndex(startIndex); <:FP4e
"(
} u=F+(NE"
fA%z*\
publicList getItems(){ 3ya1'qUC
return items; 5RH2"*8T
} zJDSbsc$%
N /$`:8"
publicvoid setItems(List items){ _-!sBK+F
this.items = items; nMfFH[I4
} /v|"0
1(Y7mM8\
publicint getPageSize(){ m"\:o
return pageSize; .o1^Oh
} r=/;iH?UH
aJL^AG
publicvoid setPageSize(int pageSize){ AsS$C&^
this.pageSize = pageSize; 5
8-e^.
} f %lD08Sl
W6T|iZoV"r
publicint getTotalCount(){ "vYE+
return totalCount; /yz=Cj oz
} UtB6V)YI
Rgo rkZlVM
publicvoid setTotalCount(int totalCount){ l\AMl
\
if(totalCount > 0){ .?p\n7
this.totalCount = totalCount; /&& 2u7*
int count = totalCount / do-ahl,
etT +
pageSize; H.<a`mm8
if(totalCount % pageSize > 0) e~ aqaY~}
count++; JjpRHw8\
indexes = newint[count]; [ xOzzp4
for(int i = 0; i < count; i++){ ;=j@,
yu
indexes = pageSize * k:2QuG^
C3hv*
i; tt?58dm|
} -7/s]9o'
}else{ )#a[-.OI
this.totalCount = 0; JXG"M#{
} &zQ2M#{82
} Cz4)Yz
`b8v1Os^2
publicint[] getIndexes(){ +')f6P;t>=
return indexes; S-31-Zjw
} ]q-g[e'
Rj F'x
publicvoid setIndexes(int[] indexes){ QIN."&qC^
this.indexes = indexes; ri`R<l8
} $@d9<83=
d_n7k g+
publicint getStartIndex(){ ;N B:e
return startIndex; -[= drj9I
} svelYe#9z
yKXff1^M
publicvoid setStartIndex(int startIndex){ e__@GBG
if(totalCount <= 0) %p^.\ch9
this.startIndex = 0; >e2<!#er|
elseif(startIndex >= totalCount) E ca\fkj
this.startIndex = indexes )&era` e[
:+{ ?
[indexes.length - 1]; -U<Upn)2
elseif(startIndex < 0) e{;OSk`x
this.startIndex = 0; 1:NrP'W^
else{ =NbI%
this.startIndex = indexes a9n^WOJ6
gH2,\z`[4
[startIndex / pageSize]; B63pgPX
} {QBB^px
} x}U8zt)yD3
uj%skOD6Z
publicint getNextIndex(){ j-CnT)W<
int nextIndex = getStartIndex() + Ngr/QL]Q
Lb{e,JH
pageSize; *Ype>x{
if(nextIndex >= totalCount) nf1#tlIJd
return getStartIndex(); 2^t#6XBk/
else |K?#$~
return nextIndex; `X,yM-(
} rC:?l(8ng3
L,d
LE-L
publicint getPreviousIndex(){ S$f6a'
int previousIndex = getStartIndex() - <<D$+@wxm
=n^!VXaL]]
pageSize; $^&ig
if(previousIndex < 0) [Q\GxX.
return0; ?u4INZ0W
else 2=?tJ2E
return previousIndex; ^:9$@+a
} 0Io'bF
$?,a[79
} Tirux ;
/h v4x9
k3+e;[My+
Rwr 2gMt7
抽象业务类 )s1Ib4C
java代码: kc/{[ME
;"O&X<BX-
h._nK\
/** k{gLMl
* Created on 2005-7-12 :K\mN/ x
*/ O62b+%~F
package com.javaeye.common.business; `/Nm
2K
yq+!czlZ
import java.io.Serializable; Z/^ u
import java.util.List; e]=!"nJ+
1!pa;$L
import org.hibernate.Criteria; 3nY1[,
import org.hibernate.HibernateException; }HE6aF62O
import org.hibernate.Session; )BfT7{WN
import org.hibernate.criterion.DetachedCriteria;
^ kST
import org.hibernate.criterion.Projections; Soie^$
Y
import {0! ~C=P
ZVeaTK4_
t
org.springframework.orm.hibernate3.HibernateCallback; Zo KcJA
import 0l;<5
H+
h07\?
%
org.springframework.orm.hibernate3.support.HibernateDaoS @!&}}"<
*9)SmSs
upport; b3wM;jv
mMMQ|ea
import com.javaeye.common.util.PaginationSupport; o]IjK
#,{+3Y&5-+
public abstract class AbstractManager extends \5Vde%!$Z
Hi_G
HibernateDaoSupport { [~:-&
SWp1|.=Sm
privateboolean cacheQueries = false; =)O,`.M.Y
ogFKUD*h&>
privateString queryCacheRegion; g%u&Zkevx
56l@a{
publicvoid setCacheQueries(boolean ~}K5#<
8q`$y$06Dk
cacheQueries){ K78rg/`
this.cacheQueries = cacheQueries; 8 6f2'o+
} X-Wz:NA
*&Z7m^`FQ
publicvoid setQueryCacheRegion(String fC}R4f7C
L6>pGx
queryCacheRegion){ vK$"# F~
this.queryCacheRegion = *5<Sr q'
1 nvTce
queryCacheRegion; <8UYhGK
} iYnEwAoN;
;,&8QcSVY
publicvoid save(finalObject entity){ &[2U$ `P`V
getHibernateTemplate().save(entity); iJnU%
} Yxv9
= 07Gy, =i
publicvoid persist(finalObject entity){ (;VVCAoy
getHibernateTemplate().save(entity); `Q+moX
} kj+#TnF-
VL[)[~^
publicvoid update(finalObject entity){ gPC*b+
getHibernateTemplate().update(entity); LJX-AO.4
} `>DP,D)w(
g+-;J+X8
publicvoid delete(finalObject entity){ e T'nl,e|
getHibernateTemplate().delete(entity); Vtppuu$
} 9+,R`v
t6c<kIQ:-O
publicObject load(finalClass entity, v){ .Z^_C
jkiTj~WE-
finalSerializable id){ I8OD$`~*U6
return getHibernateTemplate().load rQTr8DYH
q P ;A}C
(entity, id); &h*S
y
} mj?16\|]
M8k"je7`s
publicObject get(finalClass entity, 7?OH,^
`RMI(zI3g.
finalSerializable id){ m8623DB"
return getHibernateTemplate().get QZ
`tNq :/
3Rm#-T s
(entity, id); d2X[(3
} [<`SfE
|%~+2m
publicList findAll(finalClass entity){ D71;&G]0
return getHibernateTemplate().find("from (h']a!
*`(
<'Z
" + entity.getName()); T^Ab!O
} lCW8<g^
gBu1QviU
publicList findByNamedQuery(finalString z9W`FBg
BF{w)=@/'
namedQuery){ 5q@LxDy,b
return getHibernateTemplate dk8wIa"K`
`ovtHl3Q
().findByNamedQuery(namedQuery); UEak^Mm;=2
} 4Ij-Ilg)%
<"o"z2
publicList findByNamedQuery(finalString query, hO{cvHy`
_wb0'xoK"
finalObject parameter){ 93[DAs
return getHibernateTemplate RkFD*E$
k\Q,h75
().findByNamedQuery(query, parameter); d@mo!zu
} HxK$ 4I`
8\<jyJ
publicList findByNamedQuery(finalString query, \qsw"B*tv`
dBO@6*N4c
finalObject[] parameters){ TEUY3z[g
return getHibernateTemplate KlK`;cr?
U=bEA1*@0
().findByNamedQuery(query, parameters); @|yeqy_:
}
2?Ye*-
WS& kx~oQ
publicList find(finalString query){ TJ?g%
return getHibernateTemplate().find K[
.JlIP
,n2i@?NHZ
(query); bIt=v)%$
} 4LI0SwD#^/
>k']T/%
publicList find(finalString query, finalObject 66snC{gU
\EoX8b}$b0
parameter){ G;gJNK"e
return getHibernateTemplate().find 4
;Qlu
df+t:a
(query, parameter); P`U<7xF~
} NV4g~ +n
}4co)B"
public PaginationSupport findPageByCriteria 4([.xT
4VN aq<8
(final DetachedCriteria detachedCriteria){ Z?i /r5F
return findPageByCriteria }aB#z<B6
`Lyq[zg8
(detachedCriteria, PaginationSupport.PAGESIZE, 0); KsAH]2Q%
} lA>\Ko
j:5%ppIY
public PaginationSupport findPageByCriteria ,1Qd\8N9
O?bK%P]ay
(final DetachedCriteria detachedCriteria, finalint m9M
FwfZ
7#;vG>]
startIndex){ X
fz`^x>M
return findPageByCriteria ~
aZedQc
{TXOQ>gY
(detachedCriteria, PaginationSupport.PAGESIZE, QzGV.Mt2
JM0I(% Z%
startIndex); kfC0zd+
} >KGE-Yzj
4{9d#[KW
public PaginationSupport findPageByCriteria >5~7u\#9
6FfOH<\z6i
(final DetachedCriteria detachedCriteria, finalint } :iBx
NTs;FX~g[
pageSize, wh 0<Uv
finalint startIndex){ v4?iOD
return(PaginationSupport) 9-*NW0
]kktoP|D
getHibernateTemplate().execute(new HibernateCallback(){ "
oy\_1|
publicObject doInHibernate %Xh fXd'
lp&!lb`
(Session session)throws HibernateException { jyW[m,#(go
Criteria criteria = toa-Wa{
eN0P9.eqM
detachedCriteria.getExecutableCriteria(session); jigs6#
int totalCount = 5''*UFIF1
{ }e^eJ
((Integer) criteria.setProjection(Projections.rowCount Y{Ap80'\6
QHf$f@bjI
()).uniqueResult()).intValue(); /<)-q-W;
criteria.setProjection n1(?|aJ#1
\Z)1 ?fq
(null); Uv?'m&_
List items = p|6v~
~JZ3a0$^
criteria.setFirstResult(startIndex).setMaxResults 1r`i]1<H
SVP:D3)
(pageSize).list(); \Z5+$Ij
PaginationSupport ps = 74vmt<Q
NlR"$
new PaginationSupport(items, totalCount, pageSize, (4~WWU (iT
K6\` __mLf
startIndex); L0Vgo<A
return ps; W|Ldu;#
} =7[)'
}, true); vM0_>1nN
} C;1PsSE+A
<3
@}Lj
public List findAllByCriteria(final .{dE}2^
ol!86rky
DetachedCriteria detachedCriteria){ yM$J52#d#
return(List) getHibernateTemplate oC dGQ7G}
\4~AI=aw,T
().execute(new HibernateCallback(){ OS7RQw1
publicObject doInHibernate 10N,?a
B<
;==|
(Session session)throws HibernateException { nW;kcS*A
Criteria criteria = 3_ 2hC!u!K
VAj<E0>
detachedCriteria.getExecutableCriteria(session); ki\uTD`mf
return criteria.list(); 3l:QeZ
} /J%do]PDl
}, true); 2YQ#-M
} T nxKR$Hoh
5rN_jC*U
public int getCountByCriteria(final 2RNrIU I2
0%Q9}l#7
DetachedCriteria detachedCriteria){ 8Pmwzpk02
Integer count = (Integer) 9 pKm*n&
wz#[:2
getHibernateTemplate().execute(new HibernateCallback(){ eqzTQen8q
publicObject doInHibernate =t+ ('
~@M7&%]
(Session session)throws HibernateException { ?iSGH'[u
Criteria criteria = r%MyR8'k]
A!HK~yk~Q
detachedCriteria.getExecutableCriteria(session); 04-Zvp2
return 2;(W-]V?
N=fz/CD)I
criteria.setProjection(Projections.rowCount -q2MrJ*
W7e4pR?w
()).uniqueResult(); Y}1P~
} X\A]"su
}, true); v&0d$@6/U
return count.intValue(); >q|Q-I~gs
} PZ]5Hf1"
} i.@*tIK
_EKF-&Q6
<c%n?QK{
;~ee[W$1
z[#6-T
&
#
cWHDRLX
用户在web层构造查询条件detachedCriteria,和可选的 ya>N.h
_"f<Ol[!
startIndex,调用业务bean的相应findByCriteria方法,返回一个 <q6`~F~|
0/A-#'>
PaginationSupport的实例ps。 2ij/N%l
R7K
ps.getItems()得到已分页好的结果集 wXCyj+XB*
ps.getIndexes()得到分页索引的数组 {visv{R<
ps.getTotalCount()得到总结果数 }u^:MI
ps.getStartIndex()当前分页索引 Ru7L>(Njs
ps.getNextIndex()下一页索引 ' o=E!?
ps.getPreviousIndex()上一页索引 ~I)uWo
F ?mA1T>x
9/46%=&