Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 t'qYM5
?8b19DMK6
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根
n>M`wF>
Jup)m/
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 =6%oW2E\
{0zn~+
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 M;(,0d k
UiFH*HT
。 V`V\/s gj
)pnyVTKt
分页支持类: +&EXTZ@o
FfoOJzf~o
java代码: gAqK)@8-
0I&k_7_
8K 3dwoT
package com.javaeye.common.util; M([#Py9h
o96C^y{~S
import java.util.List; "W|A^@r}
n<I{x^!
publicclass PaginationSupport { d$dy6{/YD
ahBqYAK9
publicfinalstaticint PAGESIZE = 30; V$^jlWdR
{28|LwmL
privateint pageSize = PAGESIZE; $XBK_ 5
?^}30V:E
privateList items;
TCtZ2
<'
%bW_,b
privateint totalCount; k+3qX'fd
8%?y)K^
D
privateint[] indexes = newint[0]; K1B9t{T
MmuT~d/
privateint startIndex = 0; kB\{1;
bx@l6bpQ
public PaginationSupport(List items, int {T){!UVp!
*b~6 B M$
totalCount){ p?@ %/!S
setPageSize(PAGESIZE); @mp`C}x"0&
setTotalCount(totalCount); je4l3Hl
setItems(items); bDI%}k9#
setStartIndex(0);
6@S6E(^
} :2 ;Jo^6Se
IK~&`n](>
public PaginationSupport(List items, int TkbaoD
EY}:aur
totalCount, int startIndex){ }pc9uvmIJ
setPageSize(PAGESIZE); 1<@SMcj>
setTotalCount(totalCount); e#eVc'=cDR
setItems(items); Y+gY"
setStartIndex(startIndex); _T=g?0
q
} VFHd2Ea(
LF<&gC
public PaginationSupport(List items, int ,Kit@`P%
8`Ya7c>
totalCount, int pageSize, int startIndex){ eim +oms
setPageSize(pageSize); my=f}%k=
setTotalCount(totalCount); RaZ>.5
D
setItems(items); 92+8zX
setStartIndex(startIndex); c\bL_
}
{pzj@b 1S
0c_xPBbB+
publicList getItems(){ I`>U#x*
return items; v9$!v^U"D
} ]BQYVx/
r-2k<#^r
publicvoid setItems(List items){ {7o#Ve
this.items = items; ab0Sx
} +/:tap|V
C*9X;+S0J
publicint getPageSize(){ 1I+9?fa
return pageSize; 2|1fb-AR
} &hCbXs=
'6KvB
publicvoid setPageSize(int pageSize){ 'j1e(wq
this.pageSize = pageSize; EeIDlm0o
} }\pI`;*O|
P T"}2sR)
publicint getTotalCount(){ }Q7y tE
return totalCount; ~5 ^Jv m
} 3Ob.OwA
R[WiW RfD
publicvoid setTotalCount(int totalCount){ |"H 2'L$
if(totalCount > 0){ ~z,o):q1}
this.totalCount = totalCount; (!j#u)O
int count = totalCount / 6CJMQi,kn
8;PkuJR_]
pageSize; yNTd_XPL
if(totalCount % pageSize > 0) IThd\#=
count++; .
,7bGY 1$
indexes = newint[count]; p!.~hw9
for(int i = 0; i < count; i++){ ~%{2Z_t$
indexes = pageSize * PnsBDf%v
Jh[0xb
i; Onmmcem
} xO$P
C,
}else{ @hLkU4S
this.totalCount = 0; Cs $5Of(
} {]vD@)k
} >1y6DC
?ukw6T
publicint[] getIndexes(){ ?Ua,ba*
return indexes; Tc2.ciU
} VYyija:
:<%bAn
publicvoid setIndexes(int[] indexes){ t=_^$M,yr
this.indexes = indexes; lQA5HzC\
} 50UdY9E_v}
#6sz@X fV
publicint getStartIndex(){ *zfgO pK
return startIndex; :yay:3qv
} h8rW"8Th
Fu7:4+
publicvoid setStartIndex(int startIndex){ !,4ag1
if(totalCount <= 0) _Hb;)9y
this.startIndex = 0; :1v,QEb\
elseif(startIndex >= totalCount) Iq$| ?MH
this.startIndex = indexes )U^=`* 7
m 2H4V+M+
[indexes.length - 1]; JJ.8V72;!Z
elseif(startIndex < 0) 3f;=#|l
this.startIndex = 0; <,d550GSm
else{ 37AVk`a
this.startIndex = indexes 5>532X(0
yTm
\OUD
[startIndex / pageSize]; yzK;
} TS<d?:
} {>&~kM@
(Wzp sDte
publicint getNextIndex(){ z*@eQauA
int nextIndex = getStartIndex() + b0P3S!E
"gJ?LojB <
pageSize; A2
l?F
if(nextIndex >= totalCount) |Q?h"5i"(
return getStartIndex(); 6Z\ aJ
else 3^xUN|.F*V
return nextIndex; {I#_0Q,i
} i,Ct AbMx
uo F.f$%"
publicint getPreviousIndex(){ ^$c#L1
C
int previousIndex = getStartIndex() - 16NHzAQ
?HEqv$n
pageSize; \Lx=iKs<
if(previousIndex < 0) CK* *RZ
return0; fv+]iK<{
else PK\Z Rl
return previousIndex; n.%QWhUB
} >KKWhJ
a[{$4JpK
} 3i^X9[.
7vRtTP
bzN[*X|
/\J0)V
抽象业务类 @!ChPl
java代码: )ycI.[C
-H|
982=
U?[ (
/** K7}.# *% ~
* Created on 2005-7-12 k
%I83,+
*/ 8NN+Z<
package com.javaeye.common.business; ]ua3I}_B6v
p_$^keOL
import java.io.Serializable;
js$R^P
import java.util.List; (qn=BPI
~(kEGEF
import org.hibernate.Criteria; osV6=
import org.hibernate.HibernateException; J,W<ha*
import org.hibernate.Session; +{UY9_~\3
import org.hibernate.criterion.DetachedCriteria; "ubp`7%67
import org.hibernate.criterion.Projections; #~0Nk6*u
import J}|X
\C~X_/sg
org.springframework.orm.hibernate3.HibernateCallback; CS^6$VL7e
import OVK
)]- ~
84ij4ZYe
org.springframework.orm.hibernate3.support.HibernateDaoS dPUe5k)G_
1M ?BSH{
upport; -cqE^qAdX
z?/_b
import com.javaeye.common.util.PaginationSupport; K3&xe(
x}G:n[B7_V
public abstract class AbstractManager extends osC?2.
!gh8 Qs
HibernateDaoSupport { v^"\e&XL
E@VQxB7+
privateboolean cacheQueries = false; /t5)&
J[/WBVFDf
privateString queryCacheRegion; OB>Hiy
S-t#d7'B
publicvoid setCacheQueries(boolean AD?zBg Zu
O'4G'H)
cacheQueries){ N8A)lYT]_u
this.cacheQueries = cacheQueries; )JMqC+J3*t
} k4+vI1Cs
~IhAO}1
publicvoid setQueryCacheRegion(String 9a`LrB
R hWQ:l]
queryCacheRegion){ <q63?Ms'
this.queryCacheRegion = \gA!)q.;
~^wSwd[
queryCacheRegion; NuZ2,<~9
} Dfs^W{YA
=VC18yA
publicvoid save(finalObject entity){ =Rd`"]Mnfb
getHibernateTemplate().save(entity); U`v2Yw3E
} <Iw{fj|
+pd,gG?dW
publicvoid persist(finalObject entity){ X[tt'5
getHibernateTemplate().save(entity); s-p)^B
} '-wmY?ZFxy
pcMzLMG<
publicvoid update(finalObject entity){ !GOaBs
getHibernateTemplate().update(entity); 0X)vr~`
} +\!.X_Ij
Ak[X`e T
publicvoid delete(finalObject entity){ {FIzoR"
getHibernateTemplate().delete(entity); s5~k]"{j
} c4z&HQd
%H{pU:[5*
publicObject load(finalClass entity, ^O|fw?,
y2W+YV*
finalSerializable id){ 0E.N3iU
return getHibernateTemplate().load pBtO1x6x/
`[H^`
(entity, id); :7e*- '
} #GM^ :rF
D
e&,^"%
publicObject get(finalClass entity, 5lsslE+:J
ETZf
finalSerializable id){ U]hqRL
return getHibernateTemplate().get [@@{z9c
fPeS;
(entity, id); *p/,Z2f
} ^h?fr`
@O"7@%nu
publicList findAll(finalClass entity){ ^\}MG!l
return getHibernateTemplate().find("from |E+.y&0;
ZRMim6a4X
" + entity.getName()); {4_s:+v0
} i6Z7O)V
i'fw>-0
publicList findByNamedQuery(finalString M CC4'
3.W[]zH/u
namedQuery){ w=KfkdAJ*/
return getHibernateTemplate sx?IIFF
-
2)k!5X=
().findByNamedQuery(namedQuery); PUQ",;&y1
} <]Td7-n
!MoAga_
j
publicList findByNamedQuery(finalString query, t6Iy5)=zY
BU -;P
finalObject parameter){ ]_C"A
return getHibernateTemplate Pe`mZCd^
s;A7:_z#7
().findByNamedQuery(query, parameter); ; Z:[LJd
} 8Lgt
fcq8aW/z_
publicList findByNamedQuery(finalString query, HK)m^!=
461g7R%r
finalObject[] parameters){ 8063LWV
return getHibernateTemplate SkuR~!
JrcbJt
().findByNamedQuery(query, parameters); _[rFnyC+0V
} {
^o.f
$+j1^
publicList find(finalString query){ X}( s(6
return getHibernateTemplate().find 4/
` *mPW
&S4*x|-C&
(query); Fk=SkSky
} ]SJ#:7
7z?;z<VJ
publicList find(finalString query, finalObject V]|X
,G
@)>Z+g
parameter){ )<5k+O~
return getHibernateTemplate().find )j;^3LiV3
=p+n(C/
(query, parameter); (zsG!v
} J~%43!X\K
m%0-3c(
public PaginationSupport findPageByCriteria O9daeIF0#
GDSV:]hL
(final DetachedCriteria detachedCriteria){ Q6m8N
return findPageByCriteria q|*^{(tWs
3(e_2v
(detachedCriteria, PaginationSupport.PAGESIZE, 0); [9sEc
} G&S2U=KdV%
tV!?Ol
public PaginationSupport findPageByCriteria t:2DB)
$udhTI#,
(final DetachedCriteria detachedCriteria, finalint 44KoOY_
N3"Jo uP
startIndex){ <0d2{RQ;
return findPageByCriteria G*z\
^H
'K4FS(q
(detachedCriteria, PaginationSupport.PAGESIZE, hywcj\[
^QNc!{`
startIndex); xM%4/QE+
} tp`1S+'~j
??F* Z" x
public PaginationSupport findPageByCriteria u1meysa{0
VcKB:(:[
(final DetachedCriteria detachedCriteria, finalint yzN[%/
1AAyzAP9`
pageSize, ]5'$EAsuW
finalint startIndex){ ZWkRoJXNi
return(PaginationSupport) ko9}?qs
"{~5QO
getHibernateTemplate().execute(new HibernateCallback(){ ZVgfrvZP
publicObject doInHibernate -,bnj^L
uw \@~ ,d
(Session session)throws HibernateException { %u!=<yn'
Criteria criteria = xr'1CP
%:aXEjm@
detachedCriteria.getExecutableCriteria(session); 3}nk9S:jr
int totalCount = !<M
eWo
X,Na4~JO(
((Integer) criteria.setProjection(Projections.rowCount ;M?)-dpZ
]FCP|Jz
()).uniqueResult()).intValue(); rpKZ>S|7+)
criteria.setProjection b,Wm]N
6qT@M0)i
(null); SES.&e|!6
List items = ?4':~;~
!JA;0[;l=
criteria.setFirstResult(startIndex).setMaxResults Cu7{>"
529b. |
(pageSize).list(); = Pv_,%
PaginationSupport ps = ~
*&\5rPb
y?OP- 27y
new PaginationSupport(items, totalCount, pageSize,
7IxeSxXH
"0HUaU,e
startIndex); JY
return ps; ~/G)z?+E
} AERJ]$\
}, true); (H_dZL
} ;MN$.x+
T >8P1p@A,
public List findAllByCriteria(final MhN;GMH
c9+G
Qp
DetachedCriteria detachedCriteria){ F
CYGXtc
return(List) getHibernateTemplate M5no4P<
-+ByK#<%
().execute(new HibernateCallback(){ j !*,(
publicObject doInHibernate [oh06_rB
zA5nr`
(Session session)throws HibernateException { e \Qys<2r
Criteria criteria = !@& 3q|
h~>1-T8
detachedCriteria.getExecutableCriteria(session); }StzhV{GS
return criteria.list(); akvi^]x
} -+E.I*st
}, true);
^xHKoOTj[
} Xc-["y64
YF{MXK}
public int getCountByCriteria(final `Na()r$T
"VZ1LVI
DetachedCriteria detachedCriteria){ y`RzcXblIZ
Integer count = (Integer) dgP eH8_
`bQ_eRw}
getHibernateTemplate().execute(new HibernateCallback(){ ?("O.<
publicObject doInHibernate =d8Rij-
+0Q
(Session session)throws HibernateException { {]>c3=~FQb
Criteria criteria = [S'1OR$FQ\
Q:q0C
+T
detachedCriteria.getExecutableCriteria(session); *duG/?>P
return dBI-y6R
Y|R=^
=d\
criteria.setProjection(Projections.rowCount LtRRX@qJw
m%L!eR
()).uniqueResult(); }<WJR Y6j
} 3l=q@72
}, true); <);q,|eh2
return count.intValue(); q=t!COS
} -jJhiaJ$<
} VgbNZ{qk@
^t'mW;C$4
eJoM4v
p-$C*0{
z)T-<zWO;
qy|bOl
用户在web层构造查询条件detachedCriteria,和可选的 D|OGlP
#R5\k-I
startIndex,调用业务bean的相应findByCriteria方法,返回一个 StJb-K/_cL
-`'|z+V
PaginationSupport的实例ps。 8;gi8Y
[r`KoHwdm
ps.getItems()得到已分页好的结果集 [WDzaRzd
ps.getIndexes()得到分页索引的数组 =%|`gZ
ps.getTotalCount()得到总结果数 2_pF#M9
ps.getStartIndex()当前分页索引 a*(Zb|g
ps.getNextIndex()下一页索引 jzf~n~
ps.getPreviousIndex()上一页索引 !l*A3qA
,g?ny<#o
M@TG7M7Os
d~8U1}dP
=>'8<"M5z
`sm Cfh}j6
]\yB,
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 I<QUvs%e
CzV;{[?~;
,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 z#+WK|a
\hX,z =
一下代码重构了。 XKGiw 2
C
{v*4mT
我把原本我的做法也提供出来供大家讨论吧: |V5BL<4
!EIH"`>!
首先,为了实现分页查询,我封装了一个Page类: P"NI> HM
java代码: +jE)kaV%
`p\%ha!,w
1te^dh:Vp
/*Created on 2005-4-14*/ ~ n<|f
package org.flyware.util.page; "\*)KH`C
$R}C(k
;?
/** CRo'r/G
* @author Joa -`4]u!A
* ZJ{DW4#t
*/ SGl|{+(A
publicclass Page { U)kyq
vGyQ306
/** imply if the page has previous page */ ])?dqgwa
privateboolean hasPrePage; B<s+I#
Hs)]
/** imply if the page has next page */ r)S:=Is5
privateboolean hasNextPage; ),{3LIr
2M+RA}dX
/** the number of every page */ /eHf8l
privateint everyPage; lSR\wz*Fk
L~ax`i1:"
/** the total page number */ XF: wsC
privateint totalPage; EG\L]fmD
MLr L"I"
/** the number of current page */ .g/!u(iy
privateint currentPage; VQ!4(
<XD
9]3l'
/** the begin index of the records by the current r5&c!b \
ScJ:F-@>
query */ xd3mAf
privateint beginIndex; cPIyD?c
Q+f|.0r
!}c D e12
/** The default constructor */ @16y%]Q-E#
public Page(){ IRM jL.q
%enJ[a%Qg
} ` .`:~_OE
R{}_Qb
/** construct the page by everyPage qF3S\
C
* @param everyPage gS(JgN
* */ _$*-?*V&
public Page(int everyPage){ 'tTlBf7#
this.everyPage = everyPage; T2-x 1Sw_
} 6iQqOAG
Yaq0mef0
/** The whole constructor */ _x5-!gK
public Page(boolean hasPrePage, boolean hasNextPage, 2^s@n3t
~@@t-QY
F@/syX;bb5
int everyPage, int totalPage, TJ>YJD
int currentPage, int beginIndex){ J>dj]1I
this.hasPrePage = hasPrePage; e77s?WxbK
this.hasNextPage = hasNextPage; W9cvxsox
this.everyPage = everyPage; Nj6Np^@sH
this.totalPage = totalPage; p,WBF
this.currentPage = currentPage; Rt%Dps%
this.beginIndex = beginIndex; f~d=1
} .~'q
yD2V
Ge$&