Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 N f?\O@
{y|.y~vW
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 }<z[t5
"1dpv\
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 )#Ecm<.^
!#1UTa
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 =C#z Px,
hey/#GC*
。 xhCNiYJ|
qU&v50n
分页支持类: 3]\'Q}
J>hjIN
java代码: e2xKo1?I
)-6>!6hZ
SXXO#
package com.javaeye.common.util; \HMuVg'Q
pcd?6jh8
import java.util.List; ?!tO'}?
lh\`9F:
publicclass PaginationSupport { uI)z4Z
+CQIm!Sp
publicfinalstaticint PAGESIZE = 30; g5nL7;`N
Vs>e"czfm/
privateint pageSize = PAGESIZE; EE9eG31|r
?+c-m+;wj
privateList items; 3nq4Y'
3"HEXJMc
privateint totalCount; # b3 14
C:!&g~{cKi
privateint[] indexes = newint[0]; fX
LsLh+~D
SbtZhg=S_
privateint startIndex = 0; v&])D/a
pm}_\_
public PaginationSupport(List items, int 2_6@&2
W$}2
$}r0U
totalCount){ 9y\Ik/
setPageSize(PAGESIZE); UOe@R|79q
setTotalCount(totalCount); M(} T\R
setItems(items); + >tSO!}[
setStartIndex(0); $?&distJ
} !(_qM
r-hb]!t
public PaginationSupport(List items, int nS!m1&DeD
>)`*:_{
totalCount, int startIndex){ KrTlzbw&p\
setPageSize(PAGESIZE); .%\R L/
setTotalCount(totalCount); $ -]9/Ct
setItems(items); u\K`TWb%
setStartIndex(startIndex); lo7>$`Q
} ?+]
k
c L
+
public PaginationSupport(List items, int sEa| 2$
JWQd6JQ_~V
totalCount, int pageSize, int startIndex){ yTWicW7i
setPageSize(pageSize);
4f213h
setTotalCount(totalCount); }.A
\;FDyj
setItems(items); {o%OG/!1
setStartIndex(startIndex); R|\kk?,u
} 9KL)5_6 M
b\SB
publicList getItems(){ o^d
return items; m7cG]a~a
} fo;^Jg.
m.yt?`
publicvoid setItems(List items){ ,_'Z Jlx
this.items = items; @
&GA0;q0t
} ~. 5[
n}J!?zZc
publicint getPageSize(){ ur+ \!y7^R
return pageSize; ad<ZdO*h
} <@c9S,@t
Jb!s#g
publicvoid setPageSize(int pageSize){ @i>4k
this.pageSize = pageSize; K pKZiUQm
} 1?y
QjW,
]%(X}]}
publicint getTotalCount(){ _10I0Z0
return totalCount; |Mnc0Fgvy,
} 8$ _8Yva"e
_.GHtu/I
publicvoid setTotalCount(int totalCount){ +qa^K%K
if(totalCount > 0){ !$0ozDmD
this.totalCount = totalCount; e$-Y>Dd
int count = totalCount / "2
qivJ
F,xFeq$/{
pageSize; 239gpf]}
if(totalCount % pageSize > 0) d?[8VfAnh
count++; GS,}]c=
indexes = newint[count]; Ye\&_w"
for(int i = 0; i < count; i++){ [58qC:
indexes = pageSize * :W[d&e
s&W^?eKr
i; XAUHF-"WE
} 5Kkp1K$M
}else{ qc/)l~]?g{
this.totalCount = 0; %Xl(wvd
} NHD`c)Q
} t|59/R
97^)B4
publicint[] getIndexes(){ `G>BvS5h
return indexes; EE~DU;p;]
} #PMi6q~Z
Gr|102
publicvoid setIndexes(int[] indexes){ K1*V \WRW5
this.indexes = indexes; _lZWy$rm%
} d?jzh1
^4
~ V/
publicint getStartIndex(){ i=`@)E
return startIndex; Nj}-"R\u
} hx!hI1
o+T, O+i
publicvoid setStartIndex(int startIndex){ g-2(W
if(totalCount <= 0) x3=SMN|a
this.startIndex = 0; 7HQ|3rt
elseif(startIndex >= totalCount) 10..<v7
this.startIndex = indexes R5rCCp
l7S&s&W @
[indexes.length - 1]; +{&++^(}a
elseif(startIndex < 0) I*=
=I4qx
this.startIndex = 0; hODq&9!
else{ =R||c
this.startIndex = indexes }N#hg>;
B
QzD8
jk#
[startIndex / pageSize]; 'z x1kq1
} `;3fnTI:1
} ()EiBl(kWk
HhT6gJWrU
publicint getNextIndex(){ ka| 8 _C^z
int nextIndex = getStartIndex() + FrQRHbp3
hR~~k~84
pageSize; -Z&9pI(3R~
if(nextIndex >= totalCount) ^r^) &]
return getStartIndex(); O`'r:W
else 1y6{3AZm<
return nextIndex; 5H/D~hr&
} 3/RNStd<L!
),U>AiF]
publicint getPreviousIndex(){ JrwR:_+|
int previousIndex = getStartIndex() - kSU]~x
'>dx~v %
pageSize; fqD1Ej
if(previousIndex < 0) JX2@i8[~
return0; u|M_O5^
else oGqbk x
return previousIndex; YjwC8#$
} [UYE.$Y#(
PG'+vl
} \t%rIr
m7.6;k.
+{H0$4y
\WZ]'o6
抽象业务类 >vc$3%L[$
java代码: ,(Nr_K
qBcwM=R3P
0tp3mYd
/** +jGSD@32>
* Created on 2005-7-12 bv4G!21]*;
*/ %j2ZQ/z
package com.javaeye.common.business; uxD$dd?
.a]9 rQQ&_
import java.io.Serializable; L
[=JHW
import java.util.List; I@o42% w2
Eh|v>Yew
import org.hibernate.Criteria; {|/y/xYgy'
import org.hibernate.HibernateException; @hj5j;NHK
import org.hibernate.Session; 0m&W: c
import org.hibernate.criterion.DetachedCriteria; {K >}eO:K
import org.hibernate.criterion.Projections; yDe#,|-p
import *BAR`+;U
b&E9xD/;r
org.springframework.orm.hibernate3.HibernateCallback; NKE,}^C
import N9gbj%+
y-^m
org.springframework.orm.hibernate3.support.HibernateDaoS PuGc{kt
s(shgI 3g
upport; FR? \H"'x
_jD\kg#LY
import com.javaeye.common.util.PaginationSupport; Zp
<^|=D
xjg(}w
public abstract class AbstractManager extends "P@oO,.
}\/
3B_X6N
HibernateDaoSupport { KVZ-T1K
?Y\hC0a60
privateboolean cacheQueries = false; -5sKJt]+i
.%T.sQ
privateString queryCacheRegion; p1B~F
2 s<uT
publicvoid setCacheQueries(boolean Zsx\GeE%:
KkD&|&!Q7u
cacheQueries){ VJ()sbl{k
this.cacheQueries = cacheQueries; K%RjWX=H
} NX9K%J
*_CzCl^
publicvoid setQueryCacheRegion(String xJ|_R,>.H
0`%Ask
queryCacheRegion){ We?cRb
this.queryCacheRegion = g]E>e v{`
CH+mzy
queryCacheRegion; GLE"[!s]f
} K *xca(6
,7mB`0j>
publicvoid save(finalObject entity){ \9`76*X6
c
getHibernateTemplate().save(entity); V"DilV$v
} 0m
7_#g4$L
Va3/#is'
publicvoid persist(finalObject entity){ 8a,pDE
getHibernateTemplate().save(entity); L@>$
Aw
} x4%1P w
[ T!0ka
publicvoid update(finalObject entity){ (hFyp}jkk
getHibernateTemplate().update(entity); 5tQZf'pHfd
} {'$+?V"&
mo
publicvoid delete(finalObject entity){ w
getHibernateTemplate().delete(entity); ^M~Z_CQL2
} mq6TwM
Dwg_#GSr
publicObject load(finalClass entity, \:D"#s%x
u;3wg`e
finalSerializable id){ )0N^rw kW
return getHibernateTemplate().load A#KfG1K>
$fFh4O4
(entity, id); gjDxgNpa
} 8qWN~Gk1p{
AOscewQ
publicObject get(finalClass entity, ((cRe6
W}aCU~
finalSerializable id){ "`Mowp*
return getHibernateTemplate().get > xie+ ^
tv'=xDCp
(entity, id); "#G`F
} -cP7`.a
crl"Ec
publicList findAll(finalClass entity){ 3+oGR5gIN
return getHibernateTemplate().find("from 35/K9l5
$~r_&1
" + entity.getName()); p` /c&}
} }C!g x6
:hFKmoy#
publicList findByNamedQuery(finalString 3:"w"0[K3
~Y 3X*
namedQuery){ i.Z iLDs\7
return getHibernateTemplate 20?@t.aMp
pi;'! d[l%
().findByNamedQuery(namedQuery); =:;K nS
} 0I['UL^!F
X<mlaXwrA
publicList findByNamedQuery(finalString query, k<}3_
r<c&;*
finalObject parameter){ KGJ *h
return getHibernateTemplate _:7:ixN[Ie
kY^ k*-v
().findByNamedQuery(query, parameter); "X,*VQl:
} /_qW?LKG/
W*r1Sy
publicList findByNamedQuery(finalString query, pj#l s
Z~1uyr(
finalObject[] parameters){ uZe"M(3r$
return getHibernateTemplate d3"QCl
[ahK+J
().findByNamedQuery(query, parameters); TE% i
} J>8kJCh9g
%WlTx&jSgE
publicList find(finalString query){ +=K =B
return getHibernateTemplate().find \-8S"
_o7t| pl~
(query); zEk/15
} ,{X}C
qT~a`ou:
publicList find(finalString query, finalObject \wF-[']N
i "d&U7Q
parameter){ t W}"PKv
return getHibernateTemplate().find MFQyB+Z
IxaF*4JG
(query, parameter); u~7fK
} E<sd\~~A:
JA~q}C7A7o
public PaginationSupport findPageByCriteria Lu
CiO
X^Fc^U8
(final DetachedCriteria detachedCriteria){ ?&?5x%|.<
return findPageByCriteria qs!A)H#
i2+_~$f
(detachedCriteria, PaginationSupport.PAGESIZE, 0); -G(#,rXk
} nzU;Bi^m
xauMF~*
public PaginationSupport findPageByCriteria =SD^Jl{H
;zT3Fv\
(final DetachedCriteria detachedCriteria, finalint NG_7jZzXA9
jss.j~8
startIndex){ xVk5%
return findPageByCriteria Ey=ymf.}
qe'RvBz
(detachedCriteria, PaginationSupport.PAGESIZE, 3~1Gts
54].p7
startIndex); foUB/&Ee
} 0<93i
-9Dr;2\
public PaginationSupport findPageByCriteria :!Nx'F9a
#>6Jsnv1
(final DetachedCriteria detachedCriteria, finalint z(Z7[#.
?j&ZzK'#^
pageSize, c:aW"U
finalint startIndex){ 0n}v"61q
return(PaginationSupport) (67byO{
U"=Lzo.0
getHibernateTemplate().execute(new HibernateCallback(){ 8u%,5GV>Xr
publicObject doInHibernate nyetK
09qfnQG
(Session session)throws HibernateException { Y"L |D,ex
Criteria criteria = N\|BaZ%>|
V!l?FOSZ
detachedCriteria.getExecutableCriteria(session); 4n"6<cO5q
int totalCount = 6-z(34&N
aWPf3Q
((Integer) criteria.setProjection(Projections.rowCount bgxk:$E
`<{LW>Lb
()).uniqueResult()).intValue(); "
sC]z}
criteria.setProjection D?=4'"@v
\SoT^PW
(null); e+V8I&%
List items = {Fqwr>e
5'( T*"
criteria.setFirstResult(startIndex).setMaxResults 33; '6/
IXG@$O?y/
(pageSize).list(); N0%q66]1
PaginationSupport ps = ZZ L@UO>:
a@J/[$5
new PaginationSupport(items, totalCount, pageSize, sY4q$Fq
CF
3V)3}
startIndex); )|_L?q#w!'
return ps; a?yU;IKJ
} r.lHlHl
}, true); 1[J|AkN
} F2Y!aR
pKno~jja
public List findAllByCriteria(final Np i)R)
=?Ui(?tI
DetachedCriteria detachedCriteria){ ,,!P-kK$
return(List) getHibernateTemplate |]9L#
F-$!e?,H
().execute(new HibernateCallback(){ 9)t[YE:U3!
publicObject doInHibernate @]]&^ 7
Z~<=I }@
(Session session)throws HibernateException { ~>N63I6
Criteria criteria = *AP"[W
jZC[_p;
detachedCriteria.getExecutableCriteria(session); IJt'[&D
return criteria.list(); +xvn n
} G$2@N6
}, true); Oxa8u e?
} >c Lh$;l
no W]E}nN
public int getCountByCriteria(final |}.}q
0ckmHv
DetachedCriteria detachedCriteria){ bkc*it
Integer count = (Integer) "}wO<O6[
v K[%cA"
getHibernateTemplate().execute(new HibernateCallback(){ Ctn
4q'Q
publicObject doInHibernate z:$ibk4#h
hO&_VCk
(Session session)throws HibernateException { TEh.?
Criteria criteria = #4lIna%VX
p_(En4QSH
detachedCriteria.getExecutableCriteria(session);
rlGv6)vb
return gO)":!_n W
)$1>6C\
criteria.setProjection(Projections.rowCount T2/:C7zL
a+cDH
()).uniqueResult(); gb|;]mk*"
} IxS%V31
}, true);
46pR!k
return count.intValue(); 7~F~ 'V
} ~\8(+qIv%f
} KPI96P
3h:y[Vm#9y
gnjhy1o
N'WC!K.e
J{.UUw9Agd
\1LfDlQk)
用户在web层构造查询条件detachedCriteria,和可选的 o<%0|n_O&
3z(4axH'
startIndex,调用业务bean的相应findByCriteria方法,返回一个 "TJ*mN.i{}
mL pM8~L
PaginationSupport的实例ps。 m./PRV1$x
amdgb,vh
ps.getItems()得到已分页好的结果集 } ck<R
ps.getIndexes()得到分页索引的数组 KbtV>
ps.getTotalCount()得到总结果数 dzBP<Xyh
ps.getStartIndex()当前分页索引 &b`W<PAc?4
ps.getNextIndex()下一页索引 D4,>g )B
ps.getPreviousIndex()上一页索引 jeJgDAUv
o.Rv<a5.L
9O:l0
l
#XA`n@2Uoo
g27'il
9aY8`B
{x.0Yh7
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 nvT@'y+
)t"-#$,@
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 IlB8~{p_
L/r_MtN
一下代码重构了。 P3: t
4^
Hj|&P/jY]*
我把原本我的做法也提供出来供大家讨论吧: 4&;iORw&E4
BhzD V
首先,为了实现分页查询,我封装了一个Page类: <y] 67:"<v
java代码: QcW8A ,\q
Wz s=BNm9
flo$[]`.7
/*Created on 2005-4-14*/ d_M+W@{
package org.flyware.util.page; w\YS5!P,V
UJSIbb5
/** 8ZVQM7O
* @author Joa .WqqP
* M|K^u.4
*/ ro\oL
publicclass Page { L;%w{,Ji
~(ke'`gJ0-
/** imply if the page has previous page */ G:":CX"O(
privateboolean hasPrePage; jh)@3c
(+epRC
/** imply if the page has next page */ 7!pKlmQ
privateboolean hasNextPage; ZQ_6I}i")
~}}<+ JEEO
/** the number of every page */ :86:U 0^
privateint everyPage; nYjrEy)Q
e))L&s
/** the total page number */ 3@Mh* \;\b
privateint totalPage; {9U!0h-2"
fk5'v
/** the number of current page */ <[cpaZT,
privateint currentPage; #mw!_]
@m9pb+=v
/** the begin index of the records by the current q\?s<l63
{g<D:"Q
query */ $TXxhd 6
privateint beginIndex; ovTL'j!
p>`rTaeZg
Iz09O:ER
/** The default constructor */ 1xW!j!A;
public Page(){ <.QaOLD
7;fC%Fq
} eZa*WI=
3-
Kgz
/** construct the page by everyPage w}>%E6UY
* @param everyPage gmRc4o
* */ OL>>/T
public Page(int everyPage){ *x|%Nua"
this.everyPage = everyPage; 7@fS2mu
} #5@(^N5p`
q>.7VN[
vE
/** The whole constructor */ d#rr7O
public Page(boolean hasPrePage, boolean hasNextPage, fd&Fn=!
q()o|V
T,pr&1]Lw
int everyPage, int totalPage, `Npa/Q
int currentPage, int beginIndex){ xo_STLAw
this.hasPrePage = hasPrePage; rMDvnF
this.hasNextPage = hasNextPage; rF-SvSj}
this.everyPage = everyPage; *#mmk1`
this.totalPage = totalPage; (BVqmi{
this.currentPage = currentPage; 9efDM
this.beginIndex = beginIndex; &-yRa45?
} K
{'
atc
p|-MwCeH
/** SN}K=)KF#
* @return mrP48#Y+l
* Returns the beginIndex. S{+t>en
*/ x|0C0a\"A
publicint getBeginIndex(){ 2`$*HPj+G
return beginIndex; f=F:Af!
} A*y4<'}<
2d[q5p
/** L/tpT?$fi
* @param beginIndex ?$f.[;mh
* The beginIndex to set. 4H-eFs%5
*/ Trv}YT.
publicvoid setBeginIndex(int beginIndex){ i<^X z
this.beginIndex = beginIndex; 2X@9o4_4q
} F]
c\Qt
?Ij(B}D
/** T7,]^
1
* @return `MOw\Z)..
* Returns the currentPage. M*zpl}
*/ =GX5T(P8k
publicint getCurrentPage(){ +#FqC/`l
return currentPage; 7 m{lOR
} !cyrt<
'? 5-
/** ^5sA*%T4
* @param currentPage ka9@7IFM
* The currentPage to set. @Lnv
*/ HoGYgye=
publicvoid setCurrentPage(int currentPage){ MYS`@%ZV#k
this.currentPage = currentPage; X9m^i2tk
} w \b+OW
wXQxZuk[
/** YhN<vZ}U!~
* @return Z=a%)Ki?Ag
* Returns the everyPage. S0^a)#D &
*/ 7S a9
publicint getEveryPage(){ C
t,p
return everyPage; ^^N|:80
} Njc@5*rJ&
VHD+NY/
/** WywS1viD
* @param everyPage Dp([r
* The everyPage to set. %F 2h C
x
*/ {rKC4:
publicvoid setEveryPage(int everyPage){ h3?>jE=H
this.everyPage = everyPage; fN&\8SPE
} /+Z*)q+SbT
&u>dKf)5
/** a2Ak?W1
* @return -l= 4{^pK
* Returns the hasNextPage. w|9 >4
*/ "2cOS PpQL
publicboolean getHasNextPage(){ FH,]'
return hasNextPage; !Y~UO)u2
} Y2r}W3F=
Q@W/~~N
/** cRT'?w`}
* @param hasNextPage -5<[oBL;
* The hasNextPage to set. ?\V#^q-
*/ B6
0
publicvoid setHasNextPage(boolean hasNextPage){ e(0OZ_ w
this.hasNextPage = hasNextPage; Ehx9-*]
} <fUo@]Lv
S^rf^%
/** `8!9Fp
* @return h=#w< @
* Returns the hasPrePage. `B)@
*/ Z`S#> o
publicboolean getHasPrePage(){ w2DC5ei'
return hasPrePage; b#_RZ
} 2ioHhcYdJU
~>CvZ7K
/** +RooU?Aq
* @param hasPrePage 7:jLZ!mgi
* The hasPrePage to set. 7f>=-sv
*/ B>53+GyMV
publicvoid setHasPrePage(boolean hasPrePage){ t(z]4y
this.hasPrePage = hasPrePage; 2&1mI>:F
} 2aYBcPFQh#
ot}erC2~
/** xo[o^go
* @return Returns the totalPage. .t "VsY|
* _?~%+Oz/
*/ T8^9*]:@c!
publicint getTotalPage(){ f^F;`;z
return totalPage; *Al@|5
} >d + }$dB
b$_81i
/** 7gC?<;\0
* @param totalPage !.vyzCJTzB
* The totalPage to set. r:H]`Uo'r
*/ . &^p@A~
publicvoid setTotalPage(int totalPage){ 6w^P{%ul
this.totalPage = totalPage; ( /]'e}
} Z8SwW<{ $
2v{WX
} =QqH`.3
&A0OYV3i.
CHgip&(.F
U{2xgNJ
#V>R#Oh}
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 P 9?cp{*
_uIS[%4g
个PageUtil,负责对Page对象进行构造: g|~px$<iY
java代码: CRb*sfKDL
mnpk9x}m
2K}49*
/*Created on 2005-4-14*/ 5$9$R(KU
package org.flyware.util.page; *&_*G~>D
"jL>P)
import org.apache.commons.logging.Log; _Y; TS1u
import org.apache.commons.logging.LogFactory; tV)CDA&Z
zgb$@JC
/** '_c/CNs
* @author Joa %Ig$: I(o
* ]oGd,v X
*/ <`nShP>vl
publicclass PageUtil { :j&enP5R(q
~o'1PAW7
privatestaticfinal Log logger = LogFactory.getLog xUdF.c
YSD G!
(PageUtil.class); y7HFmGM
'09|Y#F
/** (y9KO56.V&
* Use the origin page to create a new page dFz"wvu` o
* @param page 9?l a5
* @param totalRecords FV^jCseZ
* @return 6`e{l+c=F
*/ m+c-"arIpA
publicstatic Page createPage(Page page, int 6W
i
n!4
DDrR9}k
totalRecords){ iH(7.?.r
return createPage(page.getEveryPage(), qAjtvc2
\J^#2{d
page.getCurrentPage(), totalRecords); >=@-]X2%j
} 2`=jKt
YC6T0m
/** SzW;Yb"#^k
* the basic page utils not including exception :>&q?xvA
wps/{h,
handler #UM,)bH
* @param everyPage D[$"nc/
* @param currentPage CNNqS^ct
* @param totalRecords rS1 gFGrj
* @return page ('&lAn
*/ bn*:Bn1
publicstatic Page createPage(int everyPage, int gVG^R02#<k
-`L`kL<
currentPage, int totalRecords){ l(>6Yq
everyPage = getEveryPage(everyPage); *)K
5<}V
currentPage = getCurrentPage(currentPage); Sz0PZtJ
int beginIndex = getBeginIndex(everyPage, _o~ pVBl/
ktyplo#F
currentPage); i~u4v3r=
int totalPage = getTotalPage(everyPage, 3&-rOc
^to*ET{0
totalRecords); PxKBcx4o`
boolean hasNextPage = hasNextPage(currentPage, aT0~C.vT
OUulG16kK
totalPage); x1gS^9MqCB
boolean hasPrePage = hasPrePage(currentPage); lSX1|,B7:]
L.;b(bFe
returnnew Page(hasPrePage, hasNextPage, fK/:
everyPage, totalPage, iYXD }l;r
currentPage, m212
gc0u
vXKL<