Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Ry>y
F` 7v
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 t,r]22I,`
0h A: =r
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 >Lo\?X~
>e {1e
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 q;,lv3I
bkd`7(r
。 SE\?8cs]-
d3:GmB .
分页支持类: !'H$08Ql}
hdDT'+
java代码: R%KF/1;/
9^F3r]bH
qHZDo[
package com.javaeye.common.util; 6C
VH)=%
dGp7EB`
import java.util.List; _Z(t**Zh6y
"r46Rfa
publicclass PaginationSupport { RiQ]AsTtl
%)7t2D
publicfinalstaticint PAGESIZE = 30; HaVhdv3L
j Mn,N9Mf
privateint pageSize = PAGESIZE; Hk*1Wrs*
e' M&Eh
privateList items; Imv#7{ndq
N" L&Z4Z
privateint totalCount; l$&~(YE f
Os<E7l zqO
privateint[] indexes = newint[0]; F6}RPk\=i
X8ulaa
privateint startIndex = 0; }gQ2\6o2g
*,JE[M
public PaginationSupport(List items, int $6Q^ur:
mcQL>7ts
totalCount){ SO6)FiPy!n
setPageSize(PAGESIZE); ASHU0v
setTotalCount(totalCount); '?Dxe
B
setItems(items); 3tZIL
setStartIndex(0); CFh9@Nx
} jh oA6I
fz^j3'!\
public PaginationSupport(List items, int
I6
?(@,
_f0AV;S:vd
totalCount, int startIndex){ /:F^*]
setPageSize(PAGESIZE); M/6Z,oOU
setTotalCount(totalCount); 6 ]x?2P%
setItems(items); .yy-jf/
setStartIndex(startIndex); ?C[?dg{n
}
E4 eXfu
12lX-~[["
public PaginationSupport(List items, int MoFM'a9
(|BY<Ac3
totalCount, int pageSize, int startIndex){ :C>7HEh-2_
setPageSize(pageSize); bqED5;d'#
setTotalCount(totalCount); i3,.E]/wX@
setItems(items); KZjh<sjX|
setStartIndex(startIndex); ~bZ=]i
} ?:wb#k)Z/
gQr+~O
publicList getItems(){ r+ bGZ
return items; -~{Z*1`,
} O#U maNj/
#Kb /tOp1
publicvoid setItems(List items){ 8)0]cX
this.items = items; 0:v!'
} n.+'9Fj
wS}c\!@<,
publicint getPageSize(){ o^/
#i`)
return pageSize; :$"{-n
} Y_CVDKdcY
~Y x_ 3
publicvoid setPageSize(int pageSize){ _4N.]jr5
this.pageSize = pageSize; .j:,WF<"l5
} FPY k`D
tkctwjD
publicint getTotalCount(){ P{9:XSa%
return totalCount; R->x_9y-R
} |4mvB2r
-iiX!@
publicvoid setTotalCount(int totalCount){ _uO$=4Sd
if(totalCount > 0){ ,m<YSMKX
this.totalCount = totalCount; AU\=n,K7
int count = totalCount / *Y(59J2
Y ]([K.I=
pageSize; +fk*c[FG
if(totalCount % pageSize > 0) 7z$Z=cs
count++; 2{h2]F
indexes = newint[count]; 8b?nr;@
for(int i = 0; i < count; i++){ QH-CZ6M
indexes = pageSize * eJo" Z
2?~nA2+vm
i; $YX{gk>
} :C_/K(Rkl
}else{ (C.
$w
this.totalCount = 0; 1(Is
7
} m ~&
} <'4Wne.z!
D;!sH?J@+
publicint[] getIndexes(){ kD#n/RBgf
return indexes; W+i^tmj
} y[XD=j
st)is4
publicvoid setIndexes(int[] indexes){ 0ZjT.Ep
this.indexes = indexes; q8$t4_pF
} NAD^10
~5HT_B U=
publicint getStartIndex(){ y8$3kXh
return startIndex; |1%%c
%
} ?1ey$SSU]
`NQ
publicvoid setStartIndex(int startIndex){ r^
Dm|^f#
if(totalCount <= 0) CC=I|/mBM
this.startIndex = 0; ` &A`&-nc=
elseif(startIndex >= totalCount) ,w~3K%B4
this.startIndex = indexes 1x_EAHZ>7
U:*rlA@_.
[indexes.length - 1]; rT `sY
elseif(startIndex < 0) xq;>||B
this.startIndex = 0; ]S%_&ZMCM
else{ SPV+ O{
this.startIndex = indexes PaSwfjOnqr
k)3N0]q6
[startIndex / pageSize]; :\~>7VFg
} Doc zQc-U+
} :z8/iD y
zh2<!MH
publicint getNextIndex(){ 'f{13-#X@
int nextIndex = getStartIndex() + q(qm3OxYo
c= t4 gf
pageSize; C?|sQcCE
if(nextIndex >= totalCount) }p?,J8=-
return getStartIndex(); l?)>"^
else Wq3PN^
return nextIndex; KRxJ2
} G|jHic!
={xRNNUj_
publicint getPreviousIndex(){ "#E
Z
int previousIndex = getStartIndex() - #+o$Tg
LhAN( [
pageSize; 1vq2`lWpx
if(previousIndex < 0) p1'q{E+o*
return0; vT#R>0@mi
else q%G[tXw
return previousIndex; ;[ QIHA!
} C+/EPPi
dlo`](5m
} +(DzE
H |
GgEg (AT
z/91v#}.
yr+QV:oVA
抽象业务类 zmQQ/7K
java代码: 8(n>99VVK
5{yg
}$<v
/** X}'rPz\Lu
* Created on 2005-7-12 `pfgx^qG
*/ x9F* $G
package com.javaeye.common.business; n}Z%-w$K#
P\dfxR;8%
import java.io.Serializable; L<dh\5#p9Y
import java.util.List; pbG-uH^
N|mggz
import org.hibernate.Criteria; }N9PV/a
import org.hibernate.HibernateException; %S^ke`MhF
import org.hibernate.Session; EJ
{vJZO
import org.hibernate.criterion.DetachedCriteria; pImq<Z
import org.hibernate.criterion.Projections; U`)
";WN
import #*:1C h]B
<q'?[aKvR
org.springframework.orm.hibernate3.HibernateCallback;
zr ez*
import Srw`vql{(
"d-vs t5
org.springframework.orm.hibernate3.support.HibernateDaoS z>+CMH5L)
F
lVG, Z
upport; |m\7/&@<
"
:e
<a?
import com.javaeye.common.util.PaginationSupport; w)<.v+u.Y
=,*/Ph&
public abstract class AbstractManager extends . ?#Q(eLj
\0lQ1FrY
HibernateDaoSupport { <,O|fY%
yUcU-pQ
privateboolean cacheQueries = false;
bo/U5p
KOR*y(* 8
privateString queryCacheRegion;
d3a!s
L"0dB.
publicvoid setCacheQueries(boolean KYkS^v
rk%pA-P2
cacheQueries){ %l%ad-V
this.cacheQueries = cacheQueries; 0Bgj.?l
} a:P+HU:
%d:cC:`
publicvoid setQueryCacheRegion(String q !}~c
vZQraY nJ
queryCacheRegion){ R,.qQF\*
this.queryCacheRegion = O\q6T7bfRW
!*DYdqQ/
queryCacheRegion; Y, Lpv|
} WTD86A
k3LHLJZ#
publicvoid save(finalObject entity){ YO.ddy*59
getHibernateTemplate().save(entity); 0{d)f1
} maSVq G
UH&1QV
publicvoid persist(finalObject entity){ kb$Yc)+R4
getHibernateTemplate().save(entity); xGOmvn^lQ
} v#9i|
A~{vja0?
publicvoid update(finalObject entity){ w[vccARQ
getHibernateTemplate().update(entity); k0FAI0~(
} `+."X1
-m,Y6
publicvoid delete(finalObject entity){ iqoMQ7%
getHibernateTemplate().delete(entity); tw 3zw`o:
} owa&HW/_
uu-M7>+
publicObject load(finalClass entity, 0WZd $
^[I>#U
finalSerializable id){ (3K,f4S@
return getHibernateTemplate().load /^K-tz-R
\0i0#Dt9
(entity, id); U
|eh
} AH#a+<;a
6e|uA7i4
publicObject get(finalClass entity, D1ik*mDA=
e~he#o[%a
finalSerializable id){ V~8]ag4
return getHibernateTemplate().get lRS'M,/
%IIFLlD
(entity, id); iig4JP'h
} _`*G71PS
//3fgoly
publicList findAll(finalClass entity){ `"V}Wq ?I
return getHibernateTemplate().find("from lwG)&qyVd
rw
2i_,.*~
" + entity.getName()); m1K4_a)^[
} Z6So5r%wZ
.i;?8?
publicList findByNamedQuery(finalString Dg Rn^gL{Q
a&kt!%p:
namedQuery){ B$OV^iwxK
return getHibernateTemplate 4F -<j!
$Ups9p Q
().findByNamedQuery(namedQuery); i6FJG\d
} CG35\b;Q
=Y^K
publicList findByNamedQuery(finalString query, /A>nsN?:]
av'[k<
finalObject parameter){ #
dUi['
return getHibernateTemplate ^VnnYtCRz
71IM`eL=ED
().findByNamedQuery(query, parameter); ^IvQdVB
} ?hrz@k|
}YiFiGf,
publicList findByNamedQuery(finalString query, Te3 ?z
y(a>Y! dgU
finalObject[] parameters){ all2?neK
return getHibernateTemplate 0XC3O 8q
benqm ~{\
().findByNamedQuery(query, parameters); b!/-9{
} %ol1WG 9
GAs.?JHd
publicList find(finalString query){ svt3gkR0
return getHibernateTemplate().find 7uu\R=$
Oku7&L1
(query); A*|\E:fo
} 3 l
j^I
Rb^G~82d?
publicList find(finalString query, finalObject B<.ZW}#v
m.gv?
parameter){ ; Ob^@OM
return getHibernateTemplate().find roi,?B_8
7 > _vH]
(query, parameter); BEAY}P(y3
} 0=9$k
q&:%/?)x
public PaginationSupport findPageByCriteria IQ$ 6}.
wZ`*C
mr
(final DetachedCriteria detachedCriteria){
fC}uIci
return findPageByCriteria {EVy.F
%n,_^voE
(detachedCriteria, PaginationSupport.PAGESIZE, 0); !F Zg'
9
} C0^r]^$Z
R%9,.g<
public PaginationSupport findPageByCriteria
w%oa={x
8h=K S
(final DetachedCriteria detachedCriteria, finalint E2=vLI]
DdeKZ)8
startIndex){ ]Ee$ulJ02
return findPageByCriteria 3/c%4b.Z
s I 0:<6W
(detachedCriteria, PaginationSupport.PAGESIZE, `4Fw,:+e
M`*
BS
startIndex); fCX8s(|F
} JPZH%#E(
# xX
public PaginationSupport findPageByCriteria @'Pay)P
!@arPN$
(final DetachedCriteria detachedCriteria, finalint tu;Pm4q7
<a+@4d;
pageSize, T}"[f/:N/
finalint startIndex){ #oR@!?
return(PaginationSupport) fgA-+y
YPKB4p#
getHibernateTemplate().execute(new HibernateCallback(){ <1QXZfQ"
publicObject doInHibernate ]{t!J^Xn
Oe "%v;-
(Session session)throws HibernateException { sQ[N3
Criteria criteria = mM{cH=
{=U*!`D
detachedCriteria.getExecutableCriteria(session); S
C}@eA'
int totalCount = ?1LRR
;-x
^q|W@uG-(
((Integer) criteria.setProjection(Projections.rowCount HHs!6`R$0c
v@J[qpX
()).uniqueResult()).intValue(); ?jvuTS 2
criteria.setProjection #\K"FE0PGz
oDt{;S8|]
(null); rz%^l1@-
List items = BJg
8WKY 4nkj
criteria.setFirstResult(startIndex).setMaxResults /*M3Ns1@2
aej'c bO
(pageSize).list(); yGV>22vv
M
PaginationSupport ps = gr@Ril^
I;G(Wj
new PaginationSupport(items, totalCount, pageSize, tCwB7c-
7y.iXe!P
startIndex); /wP2Wnq$
return ps; =u.23#.
} Nz;\PS
}, true); 8NJT:6Q7l
} $(*>]PC+)
qN
Ut
public List findAllByCriteria(final 8L6b:$Y3@C
kN#3HI]8
DetachedCriteria detachedCriteria){ 5;HCNwX
return(List) getHibernateTemplate $Fy>N>,E(
eYu 0")
().execute(new HibernateCallback(){ T)ISDK4>S"
publicObject doInHibernate M[Nv>
4_$.gO
(Session session)throws HibernateException { Ua=r24fy
Criteria criteria = <zAYq=IU
6V#EEb
detachedCriteria.getExecutableCriteria(session); <jM
{ <8-
return criteria.list(); d..JW{
} _qo\E=E
}, true); (S?DKPnR
} uotW[L9
}-u%6KZ
public int getCountByCriteria(final ~sq@^<M)s
?a1pO#{Dg
DetachedCriteria detachedCriteria){ 6)20%*[
Integer count = (Integer) (qz)3Fa
7QoMroR
getHibernateTemplate().execute(new HibernateCallback(){ \F""G,AWq{
publicObject doInHibernate K5jeazasp
8yH)9#>
(Session session)throws HibernateException { 7;&,LH
Criteria criteria = Sn'
+~6i
,g,Hb\_R)
detachedCriteria.getExecutableCriteria(session); cRWB`&
return pmO0/ty
i` ay9J8N
criteria.setProjection(Projections.rowCount sc6NON#
%hdjQIH
()).uniqueResult(); 2Vw2r@S/
} ZNL+w4
}, true); g=,}j]tl
return count.intValue(); qOnGP{
} l(@c
} :-$8u;!M
|>.</68Z
o/n4M]G
GJs~aRiz
uv^x
;P/ 4.|<
用户在web层构造查询条件detachedCriteria,和可选的 &
Y2xO
DVJn;X^T:
startIndex,调用业务bean的相应findByCriteria方法,返回一个 1i'y0]f
1uB$@a\
PaginationSupport的实例ps。 k,f/9e+#
nr,Z0
ps.getItems()得到已分页好的结果集 ErQ6a%~,
ps.getIndexes()得到分页索引的数组 UP%6s:>:
ps.getTotalCount()得到总结果数 ^Xu4N"@
ps.getStartIndex()当前分页索引 zgH*B*)bj
ps.getNextIndex()下一页索引 4??LK/s*
ps.getPreviousIndex()上一页索引
ARs]qUY
=2ED
w_5E
g2=PZR$
y~VI,82*
49c-`[d
L
='m%Iq7X
z0 #2?o
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ,CuWQ'H
qPN9Put
,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 %O<8H7e)V
PL3hrI 5
一下代码重构了。 Kpa$1x
D!.1R!(Z
我把原本我的做法也提供出来供大家讨论吧: w*;"@2y;eY
`u PLyS.
首先,为了实现分页查询,我封装了一个Page类: 6]kBG?m0
java代码: Kr `/sWZ
fFWi
3.
Hrph>v
/*Created on 2005-4-14*/ 6 . )Xeb"
package org.flyware.util.page; 3eXIo=
"Aw)0a[j1
/** H\\FAOj
* @author Joa 5Z5x\CcC3
* <V Rb
*/ .>P:{''
publicclass Page { QG2 Zh9R
Kfr1k
/** imply if the page has previous page */ kxJ[Bi#
privateboolean hasPrePage; `|nCnT'
Im@OAR4,R
/** imply if the page has next page */ ={V@Y-5T
privateboolean hasNextPage; Pnm$g;`P
1?1Bz?EKF*
/** the number of every page */ evYn}
privateint everyPage; J%M [8
6)P.wW
/** the total page number */ CH
29kQ
privateint totalPage; NY.* S6
~(kqq#=s
/** the number of current page */ nJ
xO.wWE
privateint currentPage; ]dI^
S
fb>$p_s]
/** the begin index of the records by the current '%XYJr:H[
X;Sb^c"j1
query */ x&0kIF'lq
privateint beginIndex; f.+1Ubq!5
}2Euz.0
\=bKuP(it
/** The default constructor */ lw.[qP
public Page(){ ;l
ZKgi8`
>eQ.y-
4
} N&