Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 +SJd@y@fR
[9:9Ql_h
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 cX3l t5
ws4cF
N9P?
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 f 2l{^E#h
G@j0rnn>B
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 hlt[\LP=$
s(W|f|R
。 cu+FM
Z0l+1iMx
分页支持类: J4Dry<
QY= = GfHt
java代码: =*Bl|;>6
1^gl}^|B
Z1"v}g
package com.javaeye.common.util; X.:]=,aGW
m# =z7.XrX
import java.util.List; $ `7^+8vHV
_YRE (YZ/
publicclass PaginationSupport { 43=,yz2Ef
,a#EW+" Z
publicfinalstaticint PAGESIZE = 30; !>:?rSg*
tJN<PCG6"
privateint pageSize = PAGESIZE; K(aJi,e>
L@fY$Rw
privateList items; Q|@4bz i)
av~5l4YL
privateint totalCount; .ji_nZ4.+
Ha)ANAD
privateint[] indexes = newint[0]; :,)lm.}]t
<F04GO\
privateint startIndex = 0; "jw<V,,
T1H"\+
public PaginationSupport(List items, int tsk)zP,<
!F?XLekTi
totalCount){ }\C-}
Q
setPageSize(PAGESIZE); &\_iOw8
setTotalCount(totalCount); 4!KoFoZt*
setItems(items); =JmT:enV
setStartIndex(0); {p,]oOq\
} NF?
vg/{
CD8}I85K
public PaginationSupport(List items, int mx=BD'
vhhC>
7
totalCount, int startIndex){ U,LTVYrO
setPageSize(PAGESIZE); %Rsp;1Z
setTotalCount(totalCount); Sf8{h|71
setItems(items); `jOX6_z?I
setStartIndex(startIndex); P~ &$l2
} Ps<d('=
N?.%?0l
public PaginationSupport(List items, int 9+pmS#>_
A=
w9V
totalCount, int pageSize, int startIndex){ Si~vDQ7"
setPageSize(pageSize); ~ar=PmYV7
setTotalCount(totalCount); :<|<|qJWo
setItems(items); `He,p -
setStartIndex(startIndex); $cZUM}@
} h\'n**f_x
Gw1@KKg
publicList getItems(){ =)7s $
p
return items; LcE+GC
} ."Y
e\>k
0P]E6hWgg
publicvoid setItems(List items){ Pfs;0}h5
this.items = items; M.>l#4s,'
} Nr=d<Us9f
Ox-|JJ=
publicint getPageSize(){ jQ)T6 7
return pageSize; )l#E}Uz
} /:FOPPs
.c$316
publicvoid setPageSize(int pageSize){ }-@`9(o`)
this.pageSize = pageSize; }RP@!=
} d \35a4l
GDuMY\1
publicint getTotalCount(){ \W`w` o
return totalCount; fYW6b[lI
} %D[0nt|X
5>TK^1
:
publicvoid setTotalCount(int totalCount){ \!ej<T+JR>
if(totalCount > 0){ `Ry]y"K
this.totalCount = totalCount; x@Hc@R<!
int count = totalCount / )[Yv?>ib
2r ZxSg
pageSize; ,tg0L$qC
if(totalCount % pageSize > 0) {+@bZ}57
count++; 9rA=pH%<>B
indexes = newint[count]; <=,6p>Eo[
for(int i = 0; i < count; i++){ >&U,co$>
indexes = pageSize * H8On<C=
Z@$8I{}G
i; l(#)WWr+
} dYgXtl=#j
}else{ T|6a("RL
this.totalCount = 0; &sd}ulEg`
} G}G#i`6o
} j.@\3'
,#kIr
publicint[] getIndexes(){ pt}X>ph{
return indexes; wLH] <k
} nxl[d\ap+n
VZl6t;cn
publicvoid setIndexes(int[] indexes){ &EnuE0BD
this.indexes = indexes; ^) s2$A:L
} L{`JRu
E)fglYWs2
publicint getStartIndex(){ s91JBP|B7
return startIndex; UMcgdJB
} z.I9wQ]X[
mOlI#5H
publicvoid setStartIndex(int startIndex){ ze]h..,]K
if(totalCount <= 0) yiA<,!;4P
this.startIndex = 0; _:"<[ >9
elseif(startIndex >= totalCount) oo.2Dn6z
this.startIndex = indexes }O4^Cc6
q')R4=0
K
[indexes.length - 1]; `kJ^zw+
elseif(startIndex < 0) `{xNXH]@
this.startIndex = 0; +o51x'Ld*
else{ O7 $hYk
this.startIndex = indexes ~7Tc$
"I
=pC3~-;3
[startIndex / pageSize]; c?,i3s+2Y
} e[#j.|m
} v7`HQvQEz=
d8x \
publicint getNextIndex(){
]]wA[c~G
int nextIndex = getStartIndex() + }B.H|*uO
|a!fhl+
pageSize; BV[ 5}
if(nextIndex >= totalCount) w&KK3*=""
return getStartIndex(); n .RhxgC<
else w:<W.7y?0
return nextIndex; _}En/V_
} A`}rqhU.{-
^:Gie
publicint getPreviousIndex(){ n= u&uqA*
int previousIndex = getStartIndex() - &sL&\+=<(
?28N ^
pageSize; r|qp3x
if(previousIndex < 0) *^wm1|5
return0; IDG}ZlG
else \9g+^vQg
return previousIndex; *NCl fkZ
} 9& 83n(m
GJqJlgHe
} \0f{S40
W0]gLw9*
5qP:/*+
qDfd. gL
抽象业务类 XUlS\CH@{
java代码: Ch3jxgQY
U b* wuI
uPl\I6k
/** `p;I}
* Created on 2005-7-12 -B$2\ZE
*/ jyZWVL:_
package com.javaeye.common.business; 9AJ7h9L
XnWr5-;
import java.io.Serializable; N/K.%<h
import java.util.List; 9B7^lR
SV~~Q_U9
import org.hibernate.Criteria; PJL=$gBgKk
import org.hibernate.HibernateException; Rw:*'1
import org.hibernate.Session; HEM9E&rL
import org.hibernate.criterion.DetachedCriteria; A"rfZ`
import org.hibernate.criterion.Projections; ktpaU,%
import 6'Worj
E}nH1
org.springframework.orm.hibernate3.HibernateCallback; ^*Yh@4\{JH
import ^kB8F"X
$H9%J
org.springframework.orm.hibernate3.support.HibernateDaoS J:zU,IIJ
P IwFF}<(
upport; Y*vW!yu
f__cn^1
import com.javaeye.common.util.PaginationSupport; d!
LE{
De(Hw&
IV
public abstract class AbstractManager extends b7p@Dn?E
aD$v2)RR
HibernateDaoSupport { S_IUV)
TmV,&['mg
privateboolean cacheQueries = false; 4QIX19{"
G%W8S
\
privateString queryCacheRegion; /Y7<5!cS
PU^l.
publicvoid setCacheQueries(boolean --c"0,7
$NZ-{dY{
cacheQueries){ gh8F2V;<
this.cacheQueries = cacheQueries; c5D)
} "$N+"3I
Gf<'WQ[
publicvoid setQueryCacheRegion(String ikvWh<=>H
qtQ6cqLd
queryCacheRegion){ u*ObwcI/Bn
this.queryCacheRegion = u /\EtSH
.G#8a1#
queryCacheRegion; +N:o-9
} zM(vr"U
=aBctd:eX`
publicvoid save(finalObject entity){ ~3WF,mW
getHibernateTemplate().save(entity); V^Q#:@0
} yU-e3O7L
sWc*5Rt
publicvoid persist(finalObject entity){ \Yc'~2n
getHibernateTemplate().save(entity); 0,89H4
} V#S9H!hm$
\(^nSy&N
publicvoid update(finalObject entity){ 5a|w+HO,
getHibernateTemplate().update(entity); z;|A(*Y
} `</ff+Q6
<#u=[_H
publicvoid delete(finalObject entity){ 9vGu0Um
getHibernateTemplate().delete(entity); to DG7XN}
} dE4L=sTEsy
M$>1L
publicObject load(finalClass entity, 3 +G$-ru
bj>v|#r^
finalSerializable id){ rzm:Yx
return getHibernateTemplate().load 4O )1uF;
v{ 0=
(entity, id); x"gd8j]s
} e'~J,(fB
5?3Me59
publicObject get(finalClass entity, b2OQtSr a
=IQ5<;U3
finalSerializable id){ #AL=f'2=f
return getHibernateTemplate().get DkvF 5c&
W"}M1o
(entity, id); ~nh:s|l6%M
} pxCK;]
}}\vV} s
publicList findAll(finalClass entity){ C8 xZ;V]
return getHibernateTemplate().find("from %}Ss,XJ
0;AA/
" + entity.getName()); ?&63#B,iZ
} /tf5Bv'<
!O:y@
publicList findByNamedQuery(finalString y}My.c
pEIRh1
namedQuery){ _lGdUt 2
return getHibernateTemplate ;h*K }U
`Nb[G)Xh
().findByNamedQuery(namedQuery); XkXHGDEf 1
} SEGri#s
@,cowar*
publicList findByNamedQuery(finalString query, ^h~x)@=
`lO[x.[
finalObject parameter){ v*SEb~[
return getHibernateTemplate LSGBq
B&[M7i
().findByNamedQuery(query, parameter); W;'!gpa
} VcSVu
\KQ71yqY
publicList findByNamedQuery(finalString query, +zaA,e?\
5qZ1FE
finalObject[] parameters){ b\$}>O
return getHibernateTemplate Rv$[)`&T
&U5{Hm9Ynr
().findByNamedQuery(query, parameters); _m
gHJ 0v'
} {B?Wu3-
T_@K&<
publicList find(finalString query){ @` 1Ds
return getHibernateTemplate().find *E/`KUG]
ER5gmmVP@p
(query); !Wy6/F@Z
} ktFhc3);!
k@f g(}6
publicList find(finalString query, finalObject OwH81#
t<z`N-5*
parameter){ c#Sa]n
return getHibernateTemplate().find q_g+Jf
P-D
)4gJd?
8R
(query, parameter); 6@{(;~r
} LcSX *MC
[y'f|XN
public PaginationSupport findPageByCriteria 723bkJw
V
3=FZ9>by
(final DetachedCriteria detachedCriteria){ snf~}:&
return findPageByCriteria toya fHf
EN;}$jZ>47
(detachedCriteria, PaginationSupport.PAGESIZE, 0); %l}D. ml
} sk,ox~0R
mpI5J'>]
public PaginationSupport findPageByCriteria ^S UPi
{mZC$U'
(final DetachedCriteria detachedCriteria, finalint '_w=k4
6K-_pg]
startIndex){ '=nQ$/!q
return findPageByCriteria % NA9{<I
fPn>v)lN{
(detachedCriteria, PaginationSupport.PAGESIZE, #sPHdz'3M
9`I _Et
startIndex); +*ZO&yJQ^<
} 6y+Kjd/D
-@yh>8v
public PaginationSupport findPageByCriteria [ sN EHf
(@<lRA
^
(final DetachedCriteria detachedCriteria, finalint 4)h]MOZ
)Dw,q~xgg0
pageSize, %Y<| ;0v
finalint startIndex){ u frW\X
return(PaginationSupport) i'H/ZwU
n>+mL"hs
getHibernateTemplate().execute(new HibernateCallback(){ ryW'Z{+r'
publicObject doInHibernate Hv
sob
&]e'KdXF
(Session session)throws HibernateException { s2'yY(u/
Criteria criteria = q>$ev)W
DnCP
aM4%
detachedCriteria.getExecutableCriteria(session); iYORu3
int totalCount = Ghx3EVqnx"
NdtB1b
((Integer) criteria.setProjection(Projections.rowCount Bg5Wba%NK
xO^:_8=&:
()).uniqueResult()).intValue(); J&[@}$N
criteria.setProjection ,0*&OXt
t2F_uCr
(null); k2c}3 MeP
List items = 6x h:/j3
xy5lE+E_U
criteria.setFirstResult(startIndex).setMaxResults ,&jhlZ i
a`&f
(pageSize).list(); #!aN{nK0
PaginationSupport ps = {1V($aBl
"= 6_V?&w
new PaginationSupport(items, totalCount, pageSize, :3XA!o&.T3
@&%'4j&+
startIndex); 2z6yn?'&L
return ps; \>jLRb|7Ts
} VL%UR{
}, true); ~$iIVJ`
} ])|d"[ur=
//T>G_1
public List findAllByCriteria(final )PG6gZYW
T]t+E'sQ
DetachedCriteria detachedCriteria){ A )^`?m3
return(List) getHibernateTemplate GN ]cDik
]ndvt[4L
().execute(new HibernateCallback(){ 9xO#tu]
publicObject doInHibernate $ACvV"b
iYDEI e
(Session session)throws HibernateException { [`{Z}q&
Criteria criteria = ,TXTS*V?
W3IpHV
detachedCriteria.getExecutableCriteria(session); C ~<'rO}|
return criteria.list(); c(:f\Wc3Z
}
U*(izD
}, true); &u /Nf&A
} ?]Pmxp
H}
CN#+U,NZV
public int getCountByCriteria(final SH_(rQby
sm0x LZ
DetachedCriteria detachedCriteria){ 5b!vgm#])
Integer count = (Integer) ;i
Fz?d3;
!lf|7
getHibernateTemplate().execute(new HibernateCallback(){ ap&?r`Tu
publicObject doInHibernate i=i(%yQ%
v@Gl|29_
(Session session)throws HibernateException { "}q@Y=
Criteria criteria = OK{quM5
tSVc|j
detachedCriteria.getExecutableCriteria(session); qQA}Z*(m
return q*F{/N**
dRj| g
criteria.setProjection(Projections.rowCount LV\DBDM
G B>QK
()).uniqueResult(); giZP.C"0
} +Vm}E0Ov
}, true); O\E /. B
return count.intValue(); tE@;X=
} &j4 xgh 9
} a=DcZ_M
_AQb6Nb
\^ZlG.
62 O.?Ij
`S6x<J&T\/
BFL`!^
用户在web层构造查询条件detachedCriteria,和可选的 uT}' Y)m
5]n[]FW
startIndex,调用业务bean的相应findByCriteria方法,返回一个
0Uo\wyd
J4Nln
PaginationSupport的实例ps。 AtdlZ
2] zq#6ix
ps.getItems()得到已分页好的结果集 A D1=[I3
ps.getIndexes()得到分页索引的数组 (iL|Sq&}b
ps.getTotalCount()得到总结果数 f!s=(H;
ps.getStartIndex()当前分页索引 Zb1<:[
ps.getNextIndex()下一页索引 q:dHC,fO
ps.getPreviousIndex()上一页索引 t.laO. 3
/9HVY
%n
&;D8]7d
I_<I&{N>
>sWp?
'yL%3h
_@
Ag&0wN+jTM
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 BReJ!|{m}
!q9+9 *6
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ?,&
tNP{jq
A<1hOSCz\
一下代码重构了。 ~xD={9BL
*Eo?k<:zPm
我把原本我的做法也提供出来供大家讨论吧: Olh<,p+x
_~piZmkG$
首先,为了实现分页查询,我封装了一个Page类: 4WJ.^ (
java代码: S4G^z}{_
.u4
W /
*.!Np9l,V
/*Created on 2005-4-14*/ Fxm$9(Y
package org.flyware.util.page; 1UE6 4Kl:S
dYL"h.x
/** (+B5|_xQu
* @author Joa =>M^02"
* @>p<3_Y1
*/ j!]YNH@
publicclass Page { fZ*+2T>
.w0s%T,8}^
/** imply if the page has previous page */ cUY`97bn
privateboolean hasPrePage; <Dwar>}
;\=M;Zt
/** imply if the page has next page */
[N/"5
[
privateboolean hasNextPage; 3+ @<lVew6
tD+9kf2
/** the number of every page */ UazP6^{L
privateint everyPage; jV4\A
Zg'Q>.:
/** the total page number */ XDFx.)t
privateint totalPage; ~zJ?H<>
Ib+Y~
XYR
/** the number of current page */ V+VkY3
privateint currentPage; b)=[1g/=L
Kjs.L!W
/** the begin index of the records by the current MM(xk
X4 A<[&F/
query */ 4A_[PM
privateint beginIndex; Y?(r3E^x
iZM+JqfU|D
hFH*B~*:#
/** The default constructor */ ~])t 6i
public Page(){ @Ub"5Fl4
J/[=p<I)
} jO!y_Y]B
O"F_*
/** construct the page by everyPage k3)dEH1z
* @param everyPage mg*qiScfW
* */ Hm%;=`:'
public Page(int everyPage){ rvnT6Ve
this.everyPage = everyPage; A^)?Wt%*
} 0V'nK V"|
Mf&{7%
/** The whole constructor */ (]Y 5eM
public Page(boolean hasPrePage, boolean hasNextPage, m<j8cJ(
tE]= cTSV
IW@PF7
int everyPage, int totalPage, 2vAQ
int currentPage, int beginIndex){ =o& >fw
this.hasPrePage = hasPrePage; K':K{ee>
this.hasNextPage = hasNextPage; wPwXM!
this.everyPage = everyPage; *=+td)S/1
this.totalPage = totalPage; *# tJM.Z
this.currentPage = currentPage; ;|vpwB@B
this.beginIndex = beginIndex; !f&Kf,#b`
} :=wTvz
}j*KcB_
/** N6 (
* @return (^u1~1E 5
* Returns the beginIndex. (`sH3&Kl
*/ rdJ d#S
publicint getBeginIndex(){ XT@-$%u
return beginIndex; Gu2P\I2zx
} &8l%T'gd
eS<lwA_
/** @8;W \L$~1
* @param beginIndex /J:bWr
* The beginIndex to set. H\qC["
*/ YN!>}
publicvoid setBeginIndex(int beginIndex){
FE2f'e
this.beginIndex = beginIndex; Axe8n1*y
} h $L/<3oP6
;uwRyd
/** ]cGA~d
* @return A7%:05
* Returns the currentPage. `eIenA
*/ rmE" rf
publicint getCurrentPage(){ @>E2?CV
return currentPage; 2ioQb`=
} \Dd-Xn_b
{
T-'t/0e(
/** mxz-4.
* @param currentPage 0el9&l9Ew
* The currentPage to set. &8] d }-e
*/ HmiJ~C_v`:
publicvoid setCurrentPage(int currentPage){ %=/)
this.currentPage = currentPage; K)\M5id]
} " e}3:U5n
rfNm&!K
/** :j]vf8ec
* @return /)4I|"}R0I
* Returns the everyPage. _g~qu
[1
*/ yp66{o
publicint getEveryPage(){ {3.r6ZwCn
return everyPage; OU/MiyP2
} >]W)'lnO
> 3&: 5
/** o9F/y=.r=
* @param everyPage K00
87}H
* The everyPage to set. s;64N'HH
*/ /C4^<k\
publicvoid setEveryPage(int everyPage){ v7DE
this.everyPage = everyPage; _ B5gR
} zJ)*Z,7
D?0zhU
/** 7LU}Iiv
* @return \'CDRr"uw
* Returns the hasNextPage. 2EfF=Fm>
*/ Oh'Y0_oB>
publicboolean getHasNextPage(){ %7gkNa
return hasNextPage; ,{LG4qvP
} k&.Jk
B"
US%^#D q
/** DXa-rk8
* @param hasNextPage ~R&;v3
* The hasNextPage to set. #_(jS+lP?k
*/ t$A%*JBKm
publicvoid setHasNextPage(boolean hasNextPage){ %"af748!+D
this.hasNextPage = hasNextPage; IjR'Qou5
} RW }"2
yRiP{$E
/** &'DU0c&
* @return ngat0'oa
* Returns the hasPrePage. /l<<_uk$
*/ 1$81E.
publicboolean getHasPrePage(){ V2i@.@$j
return hasPrePage; _<NMyRJo
} XLH+C ]pfr
vsr[ur[eP
/** cg*)0U-_(
* @param hasPrePage a(v>Q*zNP
* The hasPrePage to set. !}r%
u."
*/ NN1$'"@NL
publicvoid setHasPrePage(boolean hasPrePage){ 6+KHQFb&N
this.hasPrePage = hasPrePage; R#DwF,
} 5GPo*Qpl
K!] 1oy'V
/** M>>qn_yq4
* @return Returns the totalPage. ,i,q!M{-
* v0ES;
*/ [w&$| h:;
publicint getTotalPage(){ +C(/Lyo}
return totalPage; EB_NK
} d R]Q$CJ
o`q_wdy?
/** YcN!T"wJ@
* @param totalPage vJU*>U,
* The totalPage to set. K
a(J52
*/ #~.w&~:
publicvoid setTotalPage(int totalPage){ !Wy[).ZAf
this.totalPage = totalPage; O=dJi9;`#_
} A6pjRxg
y:vxE8$Q
} DANw1_X\
)h8\u_U
QtJg^2@
<@Fy5k-%.
N]<!j$pOz
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 L
~2zMkVH
个PageUtil,负责对Page对象进行构造: 0sh/|`\
java代码: zWb4([P;
Xj5~%DZp
XFh>U7z.
/*Created on 2005-4-14*/ DmBS0NyR7Y
package org.flyware.util.page; Z KOXI%~Mc
{vN}<f`
import org.apache.commons.logging.Log; Xe^Cn
R
import org.apache.commons.logging.LogFactory; z8J."27ND
fuB)qt!E
/** CCX8>09
* @author Joa V86Xg:?7
* ocyb5j
*/ @j4U^"_QB
publicclass PageUtil { Eb=#9f%y>&
b77>$[xB
privatestaticfinal Log logger = LogFactory.getLog @mBX~ ?=Z3
??i4z[0M
(PageUtil.class); Izv+i*(dl
0^8)jpL$<9
/** W(Uu@^
* Use the origin page to create a new page C^z\([k0er
* @param page 4j!]:ra
* @param totalRecords X K5<Tg
* @return 6Kj'ZyVL
*/ rX; Ys2vQ*
publicstatic Page createPage(Page page, int 1<h>B:
Vm|Y$C
totalRecords){ {"
4e+y
return createPage(page.getEveryPage(), ad_`x
CY&
hIh~S@
page.getCurrentPage(), totalRecords); ]D!k&