Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 5B)Z@-x2
c&vY0/ [
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ,#@B3~giC
:
z*OAl"
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 t>:2F,0K9
c4E=qgP
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 cD{I*t$
SRuNt3wW6
。 BR;f!
OsAH!e
分页支持类: n@r'b{2;l
Q[O[,Rk
java代码: F?TxViL
Z6#}6Y{
WB<_AIt+
package com.javaeye.common.util; wyvrNru<l4
M}MXR=X,
import java.util.List; O:3LA-vA
%Aq+t&-BCX
publicclass PaginationSupport { {PZNJ 2~
{L^b['h@
publicfinalstaticint PAGESIZE = 30; }c?/-ab>
#&a-m,Y$sx
privateint pageSize = PAGESIZE; 9&a&O
Z{
|7KW'=O
privateList items; PZmg7N
Q$r1beA
privateint totalCount; Vw0cf;
OLp;eb1g
privateint[] indexes = newint[0]; J-yj&2
{U/a h2*
privateint startIndex = 0; ;dgxeP;mp
#
Un>g4>Rh
public PaginationSupport(List items, int g(){wCI
|d =1|C%,
totalCount){ /V}>v
setPageSize(PAGESIZE); *Y(v!x \L
setTotalCount(totalCount); uH 1%diL^
setItems(items); f Glvx~
setStartIndex(0); hqOy*!8'@
} w],+l N;
DdJ>1504
public PaginationSupport(List items, int HF>Gf2-C
b /65Q&g'
totalCount, int startIndex){ j}}:&>;
setPageSize(PAGESIZE); _' KJ:3e
setTotalCount(totalCount); /3`#ldb%}
setItems(items); FrXFm+8
F
setStartIndex(startIndex); ;T6{J[
h
} m:U.ao6
+iKs)s_~
public PaginationSupport(List items, int {KkP"j'7h
c|?0iN
totalCount, int pageSize, int startIndex){ F|.,lb |L
setPageSize(pageSize); GiI|6z!
setTotalCount(totalCount); @n<y[WA
setItems(items); 6;"^Id
setStartIndex(startIndex); "o.V`Bj
} qIE e7;DO
?S&pq?
publicList getItems(){
Z|zyO-
return items; [>+}2-#
} i$MYR @
LvP{"K;
publicvoid setItems(List items){ d#~^)r
this.items = items; Oa7x(wS
} $@]tTz;b
_m3}0q
publicint getPageSize(){ :9`'R0=i^
return pageSize; llG^ +*Y8t
} .-Y3oWV
!=%E&e]
publicvoid setPageSize(int pageSize){ wkSIQL
this.pageSize = pageSize; XP#j9CF#.
} g-B~"tp
dV+%x"[:
publicint getTotalCount(){ c6zghP3dR
return totalCount; v.Fq.
} b'i-/l$
s-^B)0T!
publicvoid setTotalCount(int totalCount){ 0Vu&UD
if(totalCount > 0){ /JaCbT?*T
this.totalCount = totalCount; 3a#X:?
int count = totalCount / fwvPh&U&
N^i<A2'6S;
pageSize; }~gBnq_DDU
if(totalCount % pageSize > 0) S0X%IG
count++; s"1:#.u
indexes = newint[count]; 8)I,WWj
for(int i = 0; i < count; i++){ UuDT=_1Sh
indexes = pageSize * m(Hb! RT
( `V
i; FFE IsB"9
} fAx7_}k/ m
}else{ "&jWC
this.totalCount = 0; ;qM
I3 wF
} w7n6@"q
} M9mC\Iz[
M7D@Uj&xx(
publicint[] getIndexes(){ ]7H ?
return indexes; &S\q*H=}i
} @WcK<Qho
j1{@?
publicvoid setIndexes(int[] indexes){ z\iz6-\&y
this.indexes = indexes; Z+jgFl
4
} [Yt!uhww
_Ju@<V$
publicint getStartIndex(){ 2^-Z17Z}
return startIndex; @S#>:o|
} }jj@A !N
S@Rw+#QE
publicvoid setStartIndex(int startIndex){ j@OGl&'^-
if(totalCount <= 0) \5g7_3,3W
this.startIndex = 0; %;5AF8# c
elseif(startIndex >= totalCount) OyTE d5\3
this.startIndex = indexes lZyxJDZ A
t- Rp_2t
[indexes.length - 1]; ?Bg<74
elseif(startIndex < 0) ` oBlv
this.startIndex = 0; "S$4pj`<
else{ x,kZ>^]&b
this.startIndex = indexes [X >sG)0S~
] r8
hMv
[startIndex / pageSize]; " oWiQ{\IP
} <28L\pdG`
} }%j@%Ep[
[c6I/U=-
publicint getNextIndex(){ JE~ci#|!
int nextIndex = getStartIndex() + ?NazfK
Bq}p]R3X
pageSize; l}|KkW\y
if(nextIndex >= totalCount) JryC L]
return getStartIndex(); eURy]
else ]k2Jf}|
return nextIndex; jI`1>>N&1
} aBV{Xr~#(
%m\dNUz4g
publicint getPreviousIndex(){ ,^dyS]!d$
int previousIndex = getStartIndex() - _J<^'w^;%
P%Fkd3e+
pageSize; o)NQE?
if(previousIndex < 0) =M]f7lJ
return0; D@[Mk"f
else _O!)aD
return previousIndex; xRZ9.Agv_
} :5/P{Co(
k!/"J
;
} zbL!q_wO
r[P5
ufy2]
G]q1_q4P1?
W/dl`UDY
抽象业务类 XqD/~_z;
java代码: }*+?1kv
'BE &l W
{Vz.|
a[T
/** I?sA)!8
* Created on 2005-7-12 2{t i])
*/ U1&pcwP
package com.javaeye.common.business; J\iyc,M<M
mp2J|!Lx
import java.io.Serializable; -7_`6U2"
import java.util.List; 2l43/aCq
UL0%oJ#
import org.hibernate.Criteria; ]e0yC
import org.hibernate.HibernateException; zh2gU@"
import org.hibernate.Session; R(dVE\u
import org.hibernate.criterion.DetachedCriteria; !2dA8b
import org.hibernate.criterion.Projections; a}N m;5K
import u!in>]^
/|{Yot
e
org.springframework.orm.hibernate3.HibernateCallback; y=!"++T]B<
import /rsr|`#
XW!a?aLNX
org.springframework.orm.hibernate3.support.HibernateDaoS k(n{$
>YPC&@9
upport; G\8ps~3T
r81YL
import com.javaeye.common.util.PaginationSupport; d/>owCwQ
QN=a{
public abstract class AbstractManager extends (;1FhIi&
:[#g_*G@p
HibernateDaoSupport { imcq
H
cU\Er{
k
privateboolean cacheQueries = false; ,o(7z^1Pe;
kz]vXJ
privateString queryCacheRegion; z@E-pYV
Pkx*1.uo
publicvoid setCacheQueries(boolean -!E ))|A
g?V>+oMx
cacheQueries){ e|:#Y^
this.cacheQueries = cacheQueries; >*ey 7g
} #E`-b9Q
Z5aU7
publicvoid setQueryCacheRegion(String A^+G
w\
fFD:E} >5
queryCacheRegion){ ?haN ;n6'
this.queryCacheRegion = Y40Hcc+Fx
k%w5V>]1
queryCacheRegion; G#.(%,
} 4&r+K`C0
0T,Qn{
publicvoid save(finalObject entity){ fm2,Mx6
getHibernateTemplate().save(entity); 5>.)7D%
} (g2?&b
iuz
jg8j>"Vj>
publicvoid persist(finalObject entity){ 7Mxw0J
getHibernateTemplate().save(entity); _RG!lmJV
} eto3dJ!R
9g3J{pKcZ
publicvoid update(finalObject entity){ YDBQ6X
getHibernateTemplate().update(entity); yYmV^7G
} ^p#f B4z
'LZF^m _<<
publicvoid delete(finalObject entity){ #W#GI"K
getHibernateTemplate().delete(entity); FoM4QO
} \tFg10
mQt';|X@
publicObject load(finalClass entity, %1ofu,%
h4CDZ
finalSerializable id){ r(` ;CY]@
return getHibernateTemplate().load (p<QRb:&Z
'| Enc"U
(entity, id); <VD^f
} ?qr-t+
XWvT(+J
publicObject get(finalClass entity, 9tmYrhb$
-L>\ 58`
finalSerializable id){ WN9<
return getHibernateTemplate().get %=x|.e@J
Y%9S4be
(entity, id); uN bOtA
} IWeQMwg
qM
F'&
publicList findAll(finalClass entity){ '$u3i
#.\
return getHibernateTemplate().find("from 1Sox@Ko
BCV<( @c
" + entity.getName()); ,eq[X\B>
} +5Z0-N@
;\7TQ9z
publicList findByNamedQuery(finalString 6'y+Ev$9
zI/)#^ SQ
namedQuery){ 0wZ_;FN*-
return getHibernateTemplate !xoN%5!
dzDh V{
().findByNamedQuery(namedQuery); I}/o`oc
} grEmp9Q ?
lyiBRMiP|
publicList findByNamedQuery(finalString query, 4fBgmL
.J' 8d"+
finalObject parameter){ 4?XX_=+F|
return getHibernateTemplate REnd#
V2x
w)-@?jN
().findByNamedQuery(query, parameter); 87%t=X
} Bb[%?~
E!
pq[RH-{
publicList findByNamedQuery(finalString query, bF %#KSVw
Mw!?2G[|
finalObject[] parameters){ [ P\3XSR
return getHibernateTemplate Z!Sv/5xx
]T\K-;i
().findByNamedQuery(query, parameters); $2E n^
} KZO!
~Nf01,F
publicList find(finalString query){ <mlQn?u
return getHibernateTemplate().find ]bO{001y,
9_'xq.uP
(query); b u%p,u!
} QC0^G,9.
"-xm+7
publicList find(finalString query, finalObject r{qM!(T
TkhbnO g6
parameter){ >T{9-_#P
return getHibernateTemplate().find RWmQP%A}aw
)#[?pYd
(query, parameter); E>Ukxi1
} )t={+^Xe
kvs^*X''Ep
public PaginationSupport findPageByCriteria jLC,<V*
P<GY"W+rR
(final DetachedCriteria detachedCriteria){ TF 6_4t6
return findPageByCriteria %Qc#v$;+J
KquHc-fzqr
(detachedCriteria, PaginationSupport.PAGESIZE, 0);
`we2zT
} "m +Eu|{
flTK
public PaginationSupport findPageByCriteria pc&/'zb
N8(xz-6
(final DetachedCriteria detachedCriteria, finalint E :*!an
`+$'bNPn&
startIndex){ LFy5tX#
return findPageByCriteria I1U {t
5sC{5LJzC
(detachedCriteria, PaginationSupport.PAGESIZE, q /EK]B
`L`*jA+_
startIndex); ghd~p@4
} E^L
|Hg )!5EJ
public PaginationSupport findPageByCriteria Ous[{" -J
bTZ/$7pp9
(final DetachedCriteria detachedCriteria, finalint M$#zvcp
i+T#z
pageSize, )hj77~{+
finalint startIndex){ 2D`@$)KL
return(PaginationSupport) #*q`/O5n
'1;Q'-/J
getHibernateTemplate().execute(new HibernateCallback(){ UK+;/Mtg
publicObject doInHibernate qdh;zAMx
"L.)ML
(Session session)throws HibernateException { a*hOT_;#
Criteria criteria = 5%D:wS1
u7G@VZ Ux5
detachedCriteria.getExecutableCriteria(session); 'vj45b
int totalCount = L?&+*|VxI
%KNnss}
((Integer) criteria.setProjection(Projections.rowCount kHd_q.
HZCEr6}(
()).uniqueResult()).intValue(); L
q8}z-?
criteria.setProjection ~R-S$qizAC
3B/ GcltfM
(null); QE}S5#_"
List items = 8lI#D)}
mk_cub@
criteria.setFirstResult(startIndex).setMaxResults Rct|"k_"Ys
r~F T,
(pageSize).list(); Qi2yaEB
PaginationSupport ps = 1"A1bK
3sc5meSu'
new PaginationSupport(items, totalCount, pageSize, :s+AIo6
KL#F5\ E
startIndex); jV8mn{<
return ps; +`9
]L]J]4
} 2<>n8 K
}, true); X}p#9^%N
} %Fq"4%
-[i9a:eRM
public List findAllByCriteria(final SSycQ4[{o
}
IFZ$Y
DetachedCriteria detachedCriteria){ xy46].x-
return(List) getHibernateTemplate wx -NUTRim
67%eAS
().execute(new HibernateCallback(){ Mcc774'*9
publicObject doInHibernate jVL<7@_*
^"v~hjM#
(Session session)throws HibernateException { UevbLt1Y
Criteria criteria = TYWajcch
*XS@Ku
detachedCriteria.getExecutableCriteria(session); P482D)
return criteria.list(); iN+Dmq5
} LP_d}ve
}, true); QZef=
} 'VFxg,
]Rohf WHX
public int getCountByCriteria(final o,9E~Q '`{
dKDtj:
DetachedCriteria detachedCriteria){ -liVYI2s
Integer count = (Integer) PKT0Drv}c7
?H eC+=/Z
getHibernateTemplate().execute(new HibernateCallback(){ y/mxdPw
publicObject doInHibernate G%S=K2v
_X;^'mqf~
(Session session)throws HibernateException { LdI)
Criteria criteria = iq,qf)BY.|
LdR}v%EH
detachedCriteria.getExecutableCriteria(session); *ntq;]
return [%;LZZgl
?VEJk,/k
criteria.setProjection(Projections.rowCount l*uNi47|
qd~)Ya1
()).uniqueResult(); \.myLkm
} ;j=/2vU~@
}, true); n9gj{]%
return count.intValue(); 5[`!\vCiZ
} \6)l(b;
} 5fv eQI~!
$5r[YdnY<
w;0NtV|
o4o&}
\hQ[5>
cZ\#074u/
用户在web层构造查询条件detachedCriteria,和可选的 wX8T;bo&
~/Aw[>_;
startIndex,调用业务bean的相应findByCriteria方法,返回一个 1""9+4
!tCw)cou
PaginationSupport的实例ps。 6xr$
%/~6Qq
ps.getItems()得到已分页好的结果集 Et(Q$/W
ps.getIndexes()得到分页索引的数组 -q&VV,
ps.getTotalCount()得到总结果数 6AqHzeh
ps.getStartIndex()当前分页索引 4LtFv)i
ps.getNextIndex()下一页索引 K6@QZc5.!
ps.getPreviousIndex()上一页索引 =#^%; 6 6z
iOPv
% [
!EF~I8d\]
PP/M-Jql)
);@Dr!H
E:4`x_~qQ
uTA
/E9OY
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 F)j-D(c4
yY4*/w7*j4
,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 lDe9(5|)Q
tq}sXt
一下代码重构了。 dc5w_98o
$6XSW
我把原本我的做法也提供出来供大家讨论吧: "w9`UFu%^e
g)!B};AA
首先,为了实现分页查询,我封装了一个Page类: IKKd
java代码: L-^vlP)Vu
3^q,'!PfB
4} 'Xrg
/*Created on 2005-4-14*/ O;ZU{VY
package org.flyware.util.page; { >{|3
6LL/wemq
/** ul/= 1]1?
* @author Joa _Z.lr\
* Km8btS]n
*/ I.Co8is
publicclass Page { TOn{o}Y B
" _jIqj6C
/** imply if the page has previous page */ 8;P8CKe
privateboolean hasPrePage; 1 <.I2\^
\2U^y4K.
/** imply if the page has next page */ Sh=E.!
privateboolean hasNextPage; ,]i ^/fT
[5:,+i
/** the number of every page */ zKe&*tZ
privateint everyPage; }C/u>89%q
C#emmg!a\
/** the total page number */ f*Xonb
privateint totalPage; i?z3!`m
Kw3fpNd
/** the number of current page */ ^-w:D
privateint currentPage; =2s5>Oz+
R5ZnkPEA
/** the begin index of the records by the current r7c(/P^$G
}+nC}A"BC
query */ NO P~?p
privateint beginIndex; pB|L%#.cW
w8wF;:>
Qpndi$2H!
/** The default constructor */ j.uN`cU!
public Page(){ -i V&-oP
}el.qZ
} 5UVQ48aT
+[UFf3(ON
/** construct the page by everyPage wA+J49
* @param everyPage @4B+<,i
* */ VW<s_
public Page(int everyPage){ H?sl_3-#
this.everyPage = everyPage; 9.qI hg
} >>rW-&
?t'ZX~k
/** The whole constructor */ 3q R@$pm
public Page(boolean hasPrePage, boolean hasNextPage, Lt8chNi
[
XASoS5
lJi'%bOi
int everyPage, int totalPage, 4-eb&
int currentPage, int beginIndex){ 0L$v7,
5
this.hasPrePage = hasPrePage; L5(rP\B
this.hasNextPage = hasNextPage; 'jZ2^
this.everyPage = everyPage; v!E0/
gD
this.totalPage = totalPage; E8T4Nh_
this.currentPage = currentPage; @b=tjQO_
this.beginIndex = beginIndex; 5`{ +y]
} (?J6vK}S
Cc0`Y lx~(
/** <^UB@'lCm
* @return 9U>ID{
* Returns the beginIndex. =
*/ Dw%>y93V
publicint getBeginIndex(){ 6TbDno/!'
return beginIndex; F
71
} ge`)sB,
,ZJI]Q=!
/** Dj;h!8t.
* @param beginIndex >@[`,
* The beginIndex to set. DdJxb{y7
*/ i)1E[jc{p!
publicvoid setBeginIndex(int beginIndex){ = PqQJE}
this.beginIndex = beginIndex; q#pBlJ.LK
} ?Mp~^sgp'
!3DWz6u
/** U;?%rM6
* @return qDqIy+WR
* Returns the currentPage. b+'G^!JR
*/ &vj+3<2
publicint getCurrentPage(){ Bg-C:Ok2'
return currentPage; =w?-R\
} Yi{[llru
$G"PZ7
/** .bB_f7TH.
* @param currentPage {DI_i +2
* The currentPage to set. D2[wv+#)
*/ 82~UI'f \
publicvoid setCurrentPage(int currentPage){ vPR1
TMi>
this.currentPage = currentPage; MfJk`-%~
} Xf:CGR8_
mbsdiab#N
/** Gs7mO
* @return Mw?nIIu(@
* Returns the everyPage. C0jmjZ%w@
*/ uwj/]#`
publicint getEveryPage(){ wHBkaPO!
return everyPage; a{L`C"rJ
} K-)*S\<}
Y`LZ/Tgk
/** ~{n_rKYV
* @param everyPage %+w>`k3(N
* The everyPage to set. req=w;E:
*/ b*nytF
publicvoid setEveryPage(int everyPage){ pCb@4nb
this.everyPage = everyPage; H'<9;bD -
} 3rZFN^
Fw+JhIVP
/** hAOXOj1
* @return V(L~t=k$
* Returns the hasNextPage. -]Z!_[MlDF
*/ vROl}s;
publicboolean getHasNextPage(){ 8doT`rI1
return hasNextPage; :GIY"l'
} 6NO=NL
2
L%d,Ta>
/** y`E2IE2o
* @param hasNextPage 37ll8
* The hasNextPage to set. LOX[h$
*/ 7FqmT
publicvoid setHasNextPage(boolean hasNextPage){ 9u1_L`+b
this.hasNextPage = hasNextPage; CHdw>/5
} NRcg~Nu
6vX+-f
/** Al3Hu-Hf;`
* @return st{:]yTRk
* Returns the hasPrePage. DA]!ndJD
*/ K^J;iu 4
publicboolean getHasPrePage(){ RT9fp(6*
return hasPrePage; 56G5JSB=\
} %;yo\
v%/8pmZw;
/** 6"|PJ_@P
* @param hasPrePage |E53
[:p
* The hasPrePage to set. !H~!i.m'-
*/ 1;fs`k0p
publicvoid setHasPrePage(boolean hasPrePage){ `.MM|6
this.hasPrePage = hasPrePage; 5WO!u:!'
} :B$=Pp1
[_|iW%<`
/** A{>]M@QC2
* @return Returns the totalPage. izY,t!
* f4/!iiS}r
*/ }.NR+:0
publicint getTotalPage(){ 18}L89S>
return totalPage; bsr
} (^qcX;-
*7ap[YXZ\w
/** ,$}P<WZMu
* @param totalPage \z:p"eua z
* The totalPage to set. %a5Sc|&-
*/
G2;Uv/vR
publicvoid setTotalPage(int totalPage){ *B#OLx
this.totalPage = totalPage; E"#<I*b
} y3 LWh}~E
4J!1$
} p J+>qy5
g[8VfIe
i2N*3X~
Lg9]kpOpa
K.o?g?&<
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 !h?N)9e
bp_3ETK]P
个PageUtil,负责对Page对象进行构造: $ n n4
java代码: Vn];vN
W;~^3Hz6
%- %/3
/*Created on 2005-4-14*/ \Vm{5[ :SA
package org.flyware.util.page; xdYjl.f
QdUl-(
import org.apache.commons.logging.Log; M[<O]p6
import org.apache.commons.logging.LogFactory; t^8#~o!%
RZOk.~[v
/** J-Sf9^G
* @author Joa '!yyg#
* b2U[W#
*/ -<ZzYQk^h
publicclass PageUtil { tDy1Gh/c
RvDqo d
privatestaticfinal Log logger = LogFactory.getLog "9LPq
6XFO@c}d
(PageUtil.class); dMRwQejY{7
CrS[FM= +W
/** 1?7QS\`)fB
* Use the origin page to create a new page B^h]6Z/O
* @param page ~+l%}4RZ
* @param totalRecords _[0Ugfz(
* @return 9nM {x?
*/ "D3JdyO_S
publicstatic Page createPage(Page page, int S_ nTp)
[0/ ?(i|
totalRecords){
;wW6x
return createPage(page.getEveryPage(), MAJvjgd..
h2=zvD;
page.getCurrentPage(), totalRecords); Qksw+ZjY#{
} ;1(OC-2>d
DgClN:Hw
/** HeSnj-mtr}
* the basic page utils not including exception [C771~BL>
i;/qJKr
handler &+&^Hc
* @param everyPage SB$~Btr
* @param currentPage *aG0p&n}
* @param totalRecords EnwiE
* @return page 8Yb/ c*
*/ ~\ie/}zYj
publicstatic Page createPage(int everyPage, int xU@Z<d,k
#Sn&Wo
currentPage, int totalRecords){ "_?^uymw
everyPage = getEveryPage(everyPage); S'ikr
currentPage = getCurrentPage(currentPage); <@JU0Z"a=
int beginIndex = getBeginIndex(everyPage, pKr3(5~
>4h4t/G
currentPage); $?*+P``
int totalPage = getTotalPage(everyPage, jLb3{}0
>z[d~
totalRecords); 2GZUMXK
boolean hasNextPage = hasNextPage(currentPage, HL 88
m#8}!u&
totalPage); Bu6t3
boolean hasPrePage = hasPrePage(currentPage); Rw$ @%o%
[K"v)B'
returnnew Page(hasPrePage, hasNextPage, ^QYI`u` 4
everyPage, totalPage, /JveN8L%
currentPage, YJ1P5u:
f3v/Y5)
beginIndex); NA\,o;ka
} 0n(Q@O
&1w,;45
privatestaticint getEveryPage(int everyPage){ mcr71j
return everyPage == 0 ? 10 : everyPage; k{@z87+&
} d%]7:
d^lA52X6P
privatestaticint getCurrentPage(int currentPage){ F},JP'\X
return currentPage == 0 ? 1 : currentPage; RKjA`cJ
} @XmMD6{<