Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 @?[}\9dW
,mD{4 >7
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 -Rr Qv(
M_#^zo
"x
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 S(5&%}QFQ
f:/"OCig
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 @@+BPLl
)9V8&,
。 #}nDX4jI
8FT@TUFb
分页支持类: ZTi KU)
bqm%@*fZo
java代码: J]$]zD
C +S>;1
T |h'"3'
package com.javaeye.common.util; 0"xD>ue&
95BRZ!ts
import java.util.List; xayd_RB 9
:@sjOY
publicclass PaginationSupport { TM`6:5ONv
[7=?I.\Cr7
publicfinalstaticint PAGESIZE = 30; rPoq~p[Y
tD3v`Ke
privateint pageSize = PAGESIZE; [O^mG
9
<FU1|
privateList items; =_9grF-
4*_. m9{
privateint totalCount; $or8z2d1
9{n?Jy
privateint[] indexes = newint[0]; qM0Df0$?x
A&qZ:&(OM
privateint startIndex = 0; !wEz=
i
q
`^5<
public PaginationSupport(List items, int } !RBH(m%
8H2A<&3i
totalCount){ a3E.rr;b
setPageSize(PAGESIZE); MDOP2y`2i
setTotalCount(totalCount); LE4P$%>H
setItems(items); tLe"i>
setStartIndex(0); ]MV=@T^8#
} A$XmO}+
5$"IUq*
public PaginationSupport(List items, int T Ue=Yj
LP5@ID2G
totalCount, int startIndex){ Xe:e./@
setPageSize(PAGESIZE); hGlRf_{
setTotalCount(totalCount); ~mu)Cw
setItems(items); 7&
G#&d
setStartIndex(startIndex); )+12r6W
} jV|/ C
:,FI 6`
public PaginationSupport(List items, int 5vqh09-FB
>Gi*BB
totalCount, int pageSize, int startIndex){ }1pG0V4
setPageSize(pageSize); Id40yER
setTotalCount(totalCount); {,zn#hU.R
setItems(items); PitDk
1T
setStartIndex(startIndex); ^WmP,Xf#
} #H/suQZN"g
w]Z:Y`
publicList getItems(){ RI-)Qx&!f
return items; ?UV!^w@L:0
} g)Dg=3+>
zFeo8S
publicvoid setItems(List items){ /WJ+e
this.items = items; R7~#7qKQB
} " )/febBS
Y8%*S%yO
publicint getPageSize(){ vHxLn/
return pageSize; m<| *
} y?yWM8
@DA.$zn&
publicvoid setPageSize(int pageSize){ =/L;}m)7
this.pageSize = pageSize; $VyH2+ jC
} ":,J<|Oy
ok<!/"RX$
publicint getTotalCount(){ a;[=bp
return totalCount; a<mM
)[U
} \XT~5N6
)MU)'1jc,
publicvoid setTotalCount(int totalCount){ o<nkK+=Afm
if(totalCount > 0){ QPT%CW61M
this.totalCount = totalCount; yOXL19d@p_
int count = totalCount / D0a3%LBS/2
k&SI-jxj
pageSize; ^h\Y.
if(totalCount % pageSize > 0) yUp"%_t0
count++; /$?7L(
indexes = newint[count]; UfAN)SE"
for(int i = 0; i < count; i++){ !Xf7RT
indexes = pageSize * ?PST.+l
eIY![..J/N
i; h!h<!xaclW
} :~{x'`czJ
}else{ v'H\KR-;
this.totalCount = 0; 55]E<2't
} %_%/ym
} a.!|A(zw
Y; OqdO
publicint[] getIndexes(){ B$@fE}
return indexes; 'SE?IE {
} }Gg:y?
tX *}l|;(
publicvoid setIndexes(int[] indexes){ S,%BhQ[
this.indexes = indexes; =[T_`*s&
} NM:\T1
l&4+v.zr
publicint getStartIndex(){ :r,o-D
return startIndex; `'
"125T
} vgvJ6$#
rLzN#Zoi
publicvoid setStartIndex(int startIndex){ xD3Y-d9
if(totalCount <= 0) '2BE"e
this.startIndex = 0; ( 17=|s
elseif(startIndex >= totalCount) {Mx3G*hr
this.startIndex = indexes 8O0E;6b
-^+!:0';
[indexes.length - 1]; =&
.KKr
elseif(startIndex < 0) [$[1|r
*Q
this.startIndex = 0;
re;^,
else{ u#uT|a.
this.startIndex = indexes F1aI4H<(T
%qj8*1
[startIndex / pageSize]; X=U >r
} [[sfuJD
} R x>>0%e.
6 (@U+`
publicint getNextIndex(){ slWO\AYiO
int nextIndex = getStartIndex() + rfVHPMD0
P&0o~@`cL
pageSize; I"1H]@"=
if(nextIndex >= totalCount) Y4.t :Uzr
return getStartIndex(); zPKx: I3
else }g\1JSJ%H
return nextIndex; drc]"6 k
} 7-u['nFJ
quEP"
publicint getPreviousIndex(){ G^Q8B^Lg
int previousIndex = getStartIndex() - C_~hX G
X|iWnz+^
pageSize; V<%eWT)x7C
if(previousIndex < 0) @CJ`T&
return0; e dv&!
else V`/D!8>
return previousIndex; FhkS"y
} eVy>
$x'p+&n\
} [hl8LP+~
-lNq.pp3-$
tB i16=
R&`; C<6}D
抽象业务类 eXdE?j
java代码: Z+G.v=2q<
y$7vJl.uS/
8:)W!tr
/** ,fa'
* Created on 2005-7-12 2[8C?7_K0?
*/ }KZt7)
package com.javaeye.common.business; |)vC^=N{+
2sryhS'(H
import java.io.Serializable; iE;D_m.>`O
import java.util.List;
!8V
yK3b^
import org.hibernate.Criteria; 6|-V{
import org.hibernate.HibernateException; hhU:
nw
import org.hibernate.Session; s.p4+KJ
import org.hibernate.criterion.DetachedCriteria; qQ%RnD9
import org.hibernate.criterion.Projections; (-:lO{@FsC
import D;bHX
(v'#~ )R_`
org.springframework.orm.hibernate3.HibernateCallback; F^/1 u
import 25zmde~ w
P wY~L3,
org.springframework.orm.hibernate3.support.HibernateDaoS f0lpwwe
^DWvzfj
upport; ;`f14Fb
i6Kcj
import com.javaeye.common.util.PaginationSupport; sG6ts,={
t(RJc
public abstract class AbstractManager extends \69h>h
{Hu@|Q\~&
HibernateDaoSupport { }CCTz0[D"
H>qw@JiO!
privateboolean cacheQueries = false; 'Cv>V"X: `
Uf
?._&:
privateString queryCacheRegion; 9
Y-y?Y
J:!m49fF
publicvoid setCacheQueries(boolean p!OCF]r
abW[hp
cacheQueries){ Fzc8) *w
this.cacheQueries = cacheQueries; 8`{)1.d5[
} 'kC,pN{->
N-9Vx#i
publicvoid setQueryCacheRegion(String Sl!#!FGI
Ddr.kXIpo
queryCacheRegion){ m 3Y@p$i5
this.queryCacheRegion = fQkfU;5
Lxg,BZV
queryCacheRegion; '=Z]mi/aw
} -*<4 hFb
.EF(<JC?
publicvoid save(finalObject entity){ b 5u8j
getHibernateTemplate().save(entity); ZgzjRa++
} I+VL~'VlS
BIk0n;Kz<L
publicvoid persist(finalObject entity){ xRI7_8Jpyn
getHibernateTemplate().save(entity); %tOGs80_{
} C;UqLMrOI
WP5QA8`3
publicvoid update(finalObject entity){ 0eP ]
getHibernateTemplate().update(entity); 3hi0
} j+9;Cp]N V
`Nnaw+<]
publicvoid delete(finalObject entity){ JdK'~-L
getHibernateTemplate().delete(entity); pXy'S s@y
} U{JD\G8m
5OR2\h!XZt
publicObject load(finalClass entity, Ki,SFww8r
3tjF4C>h|
finalSerializable id){ &qjc+-r{l
return getHibernateTemplate().load 1z6$>{FUR
wOLDHg_
(entity, id); jGSY$nt9
} i eL7jN,'m
]VCVV!G_=n
publicObject get(finalClass entity, 9Ev<t\B
(\8~W*ej"
finalSerializable id){ RXD*;B$v
return getHibernateTemplate().get ~\oF}7l$
p|gzU$FWbk
(entity, id); :Rftn6!
} J\@W+/#dF
!2o1c
publicList findAll(finalClass entity){ [qL{w&R
return getHibernateTemplate().find("from i!a.6Gq
)/y7Fh
" + entity.getName()); 3 i;sB
} .DX-biX,
x@)G@'vV|
publicList findByNamedQuery(finalString F{*h~7D-|
s;ivoGe}
namedQuery){ &}y?Lt
return getHibernateTemplate _ g8CvH)?!
a$AR
().findByNamedQuery(namedQuery); ++=f7yu
} %4QpDt
;}dvc7
publicList findByNamedQuery(finalString query, x<'<E@jpU;
]J(BaX4
finalObject parameter){ @PZ{(
return getHibernateTemplate 3!u`PIQv
kdP*{
().findByNamedQuery(query, parameter); $A;%p6PO)
} m4r<=o
)yt_i'D}
publicList findByNamedQuery(finalString query, (Qcd !!
#
E{2 !Z
finalObject[] parameters){ LsI8T
uv
return getHibernateTemplate ;xl0J*r
chE}TK
().findByNamedQuery(query, parameters); VrIR!9%:
} _yRD*2 !;
)
w1`<7L
publicList find(finalString query){ {6tj$&\)
return getHibernateTemplate().find WbWEgd%8.
}WV}in0
(query); bk=ee7E7>
} >\o._?xSA
Ab
In\,x
publicList find(finalString query, finalObject YW2h#PV6_
sW,JnR
parameter){ h.*v0cq:
return getHibernateTemplate().find :Dj0W8V
,x=S)t
(query, parameter); <5 }
} vk4Q2P
r,HIoeAKP
public PaginationSupport findPageByCriteria q"e]\Tb=we
$3=S\jyfK
(final DetachedCriteria detachedCriteria){ nCS" l5
return findPageByCriteria `*ALb|4ilG
bgYUsc*uR
(detachedCriteria, PaginationSupport.PAGESIZE, 0); NXCvS0/h
} %6W%-`
{[)n<.n[g
public PaginationSupport findPageByCriteria vB%os Qm
gkmV;0
(final DetachedCriteria detachedCriteria, finalint 1N}vz(0"
eBWgAf.k
startIndex){ p/U{*i]t
return findPageByCriteria ~Z~V:~
4D}hYk$eP0
(detachedCriteria, PaginationSupport.PAGESIZE, f#kT?!sP
o/6VOX
startIndex); ri%j*Kn
} Am!OLGG4
4l`[,BJ
public PaginationSupport findPageByCriteria =/!RQQ|8o
WDi2m"
(final DetachedCriteria detachedCriteria, finalint +ag_ w}
!(HPx@_
pageSize, `=$p!H8
finalint startIndex){ i IM\_<?
return(PaginationSupport) I.[Lv7U-
Fs3
:NH
getHibernateTemplate().execute(new HibernateCallback(){ w>o/)TTJL
publicObject doInHibernate E)`:sSd9
}P'c8$
(Session session)throws HibernateException { ,`bmue5
Criteria criteria = klR\7+lK
.1+I8qj
detachedCriteria.getExecutableCriteria(session); v5\5:b{/
int totalCount = E/zclD5S
6f:u AFwG
((Integer) criteria.setProjection(Projections.rowCount );zLgNx,
X'88W-
()).uniqueResult()).intValue(); DNr*|A2<
criteria.setProjection <aLS4
unih"};ou
(null); $^_6,uBM[
List items = GC~nr-O
_= cU2
criteria.setFirstResult(startIndex).setMaxResults jV[;e15+
Z(t7QFd
(pageSize).list(); !FwNq'Q8$
PaginationSupport ps = 4f&"1:
? G`6}NP
new PaginationSupport(items, totalCount, pageSize, .8->n aj|
J&iSS9c
startIndex); #aQQd8
return ps; 2EOx],(|
} s"XwO8yhM
}, true); fy$?~Ji&
} ?N(<w?Gat
.1}1e;f-
public List findAllByCriteria(final 84!Hd.H
UiVGOQq
DetachedCriteria detachedCriteria){ d_Jj&:"l
return(List) getHibernateTemplate Z5p
[*LMO
Gj?$HFa
().execute(new HibernateCallback(){ 6?Kl L [~
publicObject doInHibernate !TivQB
l/,la]!T
(Session session)throws HibernateException { qW`?,N)r
Criteria criteria = fwvwmZW
!1=*"H%t
detachedCriteria.getExecutableCriteria(session); _RIlGs\.
return criteria.list(); bZ_TW9mq
} pztfm'
}, true); mITNx^p4f
} eyuyaSE
):_@i
public int getCountByCriteria(final e=nvm'[h
Q6RTH
DetachedCriteria detachedCriteria){ ?5jLN&A3 G
Integer count = (Integer) '$c9 S[
`yP`5a/
getHibernateTemplate().execute(new HibernateCallback(){ g60k R7;\
publicObject doInHibernate +TyN;e
P@keg*5@
(Session session)throws HibernateException { h!ogH >S~
Criteria criteria = damG*-7Svx
|j-ng;
detachedCriteria.getExecutableCriteria(session); $_iE^zZaU^
return 4&=</ok6`0
JEk'2Htx
criteria.setProjection(Projections.rowCount <:Mz2Rg
3@qv[yOE
()).uniqueResult(); op\$(7<d-
}
3%bhW9H%
}, true); ]
j8bv3
return count.intValue(); 4y#XX[2Wj
} -pIz-*
} } lDX3h
7FJ4;HLQ
_-lE$
O
=kfa1kD&{
araXE~Ac
7f}uRXBV$A
用户在web层构造查询条件detachedCriteria,和可选的 14"57Jt8
J
jm={+@+
startIndex,调用业务bean的相应findByCriteria方法,返回一个 eZ+6U`^t
.>eR X%
PaginationSupport的实例ps。 NhCucSU<K
P1Z"}Qw
ps.getItems()得到已分页好的结果集 /OWwC%tM/
ps.getIndexes()得到分页索引的数组 xnt) 1Q
ps.getTotalCount()得到总结果数 ;Y[D#Ja-
ps.getStartIndex()当前分页索引 ^~.AV]t|
ps.getNextIndex()下一页索引 lOp.cU
ps.getPreviousIndex()上一页索引 [{Jo(X
u5Vgi0}A
TIxOMY y
I`_I^C3
Y X^c}t}U
[8a(4]4
e.skE>&
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 W2#<]]-
[#C6K '
,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 GdcXU:J /
>x JzV
一下代码重构了。 ~1%*w*
IJ&Lk=2E]
我把原本我的做法也提供出来供大家讨论吧: W-l+%T!
L7Hv)
首先,为了实现分页查询,我封装了一个Page类: v@soS1V!
java代码: o0]YDX@T
nj'5iiV`]
O-X(8<~H=
/*Created on 2005-4-14*/ Xg96I:r'p
package org.flyware.util.page; :Y\ ~[Y
**L&I5Hhm
/** pX{wEc6}
* @author Joa 1,%`vlYv
* F5qA!jZ1]
*/ Q{|%kU"
publicclass Page { P,ueLG=
953qz]Q8
/** imply if the page has previous page */ vII{i
privateboolean hasPrePage; U8Zb&6
@k&6\1/U
/** imply if the page has next page */ \^*:1=|7u]
privateboolean hasNextPage; $j.;$~F
_i}b]xfM
/** the number of every page */ tkT,M,]?9
privateint everyPage; B`Z3e%g#
vt{[_L(h
/** the total page number */ r=5S0
privateint totalPage; )0-A;X2
ea"X$<s>-
/** the number of current page */ 1hY| XZ%qd
privateint currentPage; | J3'#7
7h}gIm7e"
/** the begin index of the records by the current >)u;X
D{6y^@/
query */ ?"mZb#%
privateint beginIndex; K2zln_W
ywAvqT,
dGYR
'x
/** The default constructor */ M; wKTTQy
public Page(){ l.o/H|
Qc3d<{7\~
} Dj(PH3^
|${4sUR
/** construct the page by everyPage ~^1y(-cw
* @param everyPage UHZ&7jfl
* */ 5_aj]"x
public Page(int everyPage){ +PjTT6
this.everyPage = everyPage; x 4+WZYv3
} |+q_kx@?l
qU!dg
/** The whole constructor */ ^A@f{g$KB+
public Page(boolean hasPrePage, boolean hasNextPage, %xlpOR4
]
#@:VR
*'-4%7C`1
int everyPage, int totalPage, <=">2WP{
int currentPage, int beginIndex){ EwzR4,r\M
this.hasPrePage = hasPrePage; KVa{;zBwl
this.hasNextPage = hasNextPage; E2'Wzrovlo
this.everyPage = everyPage; -U /)y:k!%
this.totalPage = totalPage; 1 %P-X!
this.currentPage = currentPage; (N9-YP?qm
this.beginIndex = beginIndex; JB~^J5#[Oh
} x#EE_i/W
KSPa2>lz?
/** gB'ajX=OA/
* @return 8M*+
|
* Returns the beginIndex. ~a([e\~
*/ u2oS Ci
publicint getBeginIndex(){ zWC| Qe
return beginIndex; e,xL~P{|
} z< L2W",
EfEgY|V0
/** LS[o7 !T(
* @param beginIndex \#HW.5
* The beginIndex to set. JD$g%hcVZa
*/ rkjnw@x\
publicvoid setBeginIndex(int beginIndex){ Wk0E7Pr
this.beginIndex = beginIndex; hI:.Qp`r
} ']1n?K=A
l;iU9<~
/** mH$tG
$
* @return <Q~N9W
* Returns the currentPage. ['IH*gi
*/ h ik.qK
publicint getCurrentPage(){ KV_/fa~Ry
return currentPage; =~+ WJN
} =xo0T 6
-Q n-w3~&
/** 9>~pA]j%
* @param currentPage ,W}:vdC
* The currentPage to set. ( V4Ppg
*/ y0d=
publicvoid setCurrentPage(int currentPage){ eA4D.7HDK
this.currentPage = currentPage; ,m=G9QcN
} j;3I` :
)q=F_:$
/** }3{eVct#|
* @return m.K cTM%j
* Returns the everyPage. ;7P'>j1?U
*/ )dkU4]
publicint getEveryPage(){ 'dKfXYY1`N
return everyPage; +l7)7qKx
} .g8*K "
u"HGT=Nl
/** |{ N{VK
* @param everyPage +K1M&(
* The everyPage to set. G,)zn9X
*/ Iq+N0G<j
publicvoid setEveryPage(int everyPage){ Pf[E..HF*d
this.everyPage = everyPage; OIP]9lM$nC
} A<+Dx
KW .4 9
/** cqG6di7#
* @return 1p}Wj*mc
* Returns the hasNextPage. l{[@Ahb}?
*/ '0HOL)cIz
publicboolean getHasNextPage(){ 1"H;Tr|
return hasNextPage; .?45:Ey~g
} OXEEpoU?V
I\Op/`_=E
/** <o%T]
* @param hasNextPage t8*Jdd^3Z/
* The hasNextPage to set. UGO#o`.G}
*/ e(t}$Q=
publicvoid setHasNextPage(boolean hasNextPage){ 8FuxN2
this.hasNextPage = hasNextPage; izl6L
} 'S_i6K
%hVR|K|J
/** h!w::cV
* @return 4qid+ [B
* Returns the hasPrePage. C8-7XQ=B:b
*/ 36=aahXd\
publicboolean getHasPrePage(){ +u$l]~St\
return hasPrePage; #LasTN9
} ok\-IU?
K0.aU
/** <