Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 tGh!5EZ6`
Qo \;)
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 3/?{=
{
$56Z/*
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 !TdbD56
*mj3 T
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 *Z=:?4u
j= Ebk;6p
。 bG[)r
N\WEp?%~
分页支持类: j?cE0
hz
zXx)xIO
java代码: ;bxL$1
*we*IhIP
YU24wTe;k
package com.javaeye.common.util; h(wu5G0C#u
$
-n?q w
import java.util.List; Wk&g!FR
9Fv VM9
publicclass PaginationSupport { 2 K&5Kt/
SLMnEtyTS
publicfinalstaticint PAGESIZE = 30; Z4'8x h)-
O&De!Gx
privateint pageSize = PAGESIZE; @
wJ|vW_.
j_2yTz"G-
privateList items; zd+<1R;
| ?])]F
privateint totalCount; %N
}0,a0
j6{9XIRo_
privateint[] indexes = newint[0]; bB`p-1
MZInS:Vj
privateint startIndex = 0; f)/5%W7n}
Xeo2 < @[
public PaginationSupport(List items, int 5t&;>-A'?'
l^*'W(%
totalCount){ Fj~,>
setPageSize(PAGESIZE); W.t`
setTotalCount(totalCount); @z1Yj"^Pm
setItems(items); UL
setStartIndex(0); :#=XT9
} XAf,k&f3
uzpW0(_i3a
public PaginationSupport(List items, int QCvz| )
",gWO8T
totalCount, int startIndex){ nVVQ^i}`G
setPageSize(PAGESIZE); +8\1.vY
setTotalCount(totalCount); x^ruPiH
setItems(items); b/eJEL
setStartIndex(startIndex); /^T XGc.
} .Q^8_'ZG
"0(
_
public PaginationSupport(List items, int 20XN5dTFT
ggn:DE"
totalCount, int pageSize, int startIndex){ a*gzVE7W#n
setPageSize(pageSize); @3F 4Lg6H|
setTotalCount(totalCount); p Y[dJxB
setItems(items); c8cPGm#i
setStartIndex(startIndex); xJ18M@"j
} i{
" g7
L]C|&KP
publicList getItems(){
|wFfVDp
return items; WG0Ne;Ho
} ev_4!+ko
/T_@rm
publicvoid setItems(List items){ (dh{Gk4=+
this.items = items; {!`0i
} i)pAFv<$,
H3{FiB]
publicint getPageSize(){ %kRQ9I".
return pageSize; <$]=Vaq
} #M5R>&?Jqz
utDjN"
publicvoid setPageSize(int pageSize){ t kJw}W1@
this.pageSize = pageSize; KDODUohC
} a*4l!-7
2MapB*
publicint getTotalCount(){ <:rbK9MIl
return totalCount; !b0ANIp
} U)n+j}vi
1>BY:xZr
publicvoid setTotalCount(int totalCount){ ^mA ^7jB
if(totalCount > 0){ np#RBy
this.totalCount = totalCount; C;C= g1I}
int count = totalCount / TZ2-%k#
;n)9
pageSize;
Pq@%MF]5
if(totalCount % pageSize > 0) Av#_cL
count++; u\9t+wi}<
indexes = newint[count]; `(rnD
for(int i = 0; i < count; i++){ XDWR]
indexes = pageSize * fi6i{(K
1D6F
WYV8
i; 0A}'@N@G)
} ~F
,mc.
}else{ l,pI~A`w_
this.totalCount = 0; X_6h8n}i
} \LQ?s)~
} 6!e I=h2P
&r)i6{w81
publicint[] getIndexes(){ N^{"k,vB-
return indexes; kDz!v?Z2+B
} xElHYh(\
4*K~6Vh
publicvoid setIndexes(int[] indexes){ 5w#
Ceg9
this.indexes = indexes; ,o3{?o]s
} ;6T>p
$Z!$E,@c
publicint getStartIndex(){ {O4y Y=G
return startIndex; g=T
!fF=
} gW[(gf.oo
k{?Pgf27
publicvoid setStartIndex(int startIndex){
9z9EK'g
if(totalCount <= 0) 9F&s9(=\
this.startIndex = 0;
c%N8|!e
elseif(startIndex >= totalCount) P}AfXgr
this.startIndex = indexes -f+U:/'.>v
,'KQF C
[indexes.length - 1]; <u'q._m
elseif(startIndex < 0) _h=kjc}[.O
this.startIndex = 0; U49#?^?
else{ am$-1+iX
this.startIndex = indexes Vl0
J!JK_
=%}++7#
[startIndex / pageSize]; uTemAIp
$u
} YhVV~bvz*
} VOj{&O2c
]%RX\~Q.4
publicint getNextIndex(){ K|n$-WDG}
int nextIndex = getStartIndex() + ^WZcM#~TL
6WN1DW
pageSize; /n9yv
if(nextIndex >= totalCount) zj ?^,\{A
return getStartIndex(); =sR]/XSK
else QL<uQ`>(
return nextIndex; &g{b5x{iD
} o
IUjd
b R6g^Yf
publicint getPreviousIndex(){ x2^Yvgc-
int previousIndex = getStartIndex() - fc~6/
80p? qe
pageSize; C1/<t)^
if(previousIndex < 0) y}'c)u
return0; A 11w{`EM
else &s +DK`
return previousIndex; <rO0t9OH
} {iyO96YI[^
M=mzl750M
} C
Rd1zDB
BRTM]tRZ
F)W7,^=X>-
*$t<H-U-
抽象业务类 N^G:m~>
java代码: @+9x8*~S'
yEaim~
?f\;z<e|
/** Slk__eC
* Created on 2005-7-12 i|@lUXBp
*/ +x7b9sHJ
package com.javaeye.common.business; )4[Yplo
U_ -9rkUa
import java.io.Serializable; Yt 9{:+[RK
import java.util.List; O3?3XB> <
hU:M]O0uw
import org.hibernate.Criteria; RjII(4Et
import org.hibernate.HibernateException; j2UiZLuV
import org.hibernate.Session; bVB_KE
import org.hibernate.criterion.DetachedCriteria; y5td o'Ex
import org.hibernate.criterion.Projections; sd@JQ%O
import 2WP73:'t
i.|zKjF'
org.springframework.orm.hibernate3.HibernateCallback; '^TQ Ubw
import y?ps+ce93
OZ/P@`kN.f
org.springframework.orm.hibernate3.support.HibernateDaoS {Z529Ns
:GXD-6}^|
upport; (BB&ZUdyv
QbF!V%+a's
import com.javaeye.common.util.PaginationSupport; SMMV$;O{9
'u\my
public abstract class AbstractManager extends <.DFa/G
kl0!*j
HibernateDaoSupport { ;3nR_6\
l17sJ! I
privateboolean cacheQueries = false; dSD7(s!
:YZqrcr}
privateString queryCacheRegion; MH"{N
"|
Mw0Kg9M
publicvoid setCacheQueries(boolean
z,6X{=
6D[m}/?Uy
cacheQueries){ uafSz@`
this.cacheQueries = cacheQueries; ICJp-
} xKilTh_.6
?!N@%R>5rN
publicvoid setQueryCacheRegion(String M^i^_}~S;
;1S~'B&1Q
queryCacheRegion){ Mr5E\~K>s
this.queryCacheRegion = EJd l%j
#HMJBQ4v#
queryCacheRegion; F,t
,Ja
} 9@nDXZPY&
QY]^^f
publicvoid save(finalObject entity){ Km5#$IiP;
getHibernateTemplate().save(entity); l!U_7)s/
} Z!@<[Vo6
"T*Sg
publicvoid persist(finalObject entity){ 20 j9~+
getHibernateTemplate().save(entity); ^-s'Ad3
} i.eu$~F
U_/sY9gz(
publicvoid update(finalObject entity){ 7^{M:kYC!
getHibernateTemplate().update(entity); UDJ{iZ
} Ueq*R(9>
cULASS`,
publicvoid delete(finalObject entity){ 6`KAl rH
getHibernateTemplate().delete(entity); [D]9M"L,vQ
} HFJna2B`
3DNw=Ic0k
publicObject load(finalClass entity, On[:]#
~Rs_ep'+Q2
finalSerializable id){ "pb$[*_@$
return getHibernateTemplate().load YbMeSU/sX
eR'Df"+
(entity, id); nUAoPE
} uXs.7+f
%i7bkdcwk
publicObject get(finalClass entity, J!
;g.q
d)'am
3Q
finalSerializable id){ j,q8n`@
return getHibernateTemplate().get E0;KTcZi
TM|M#hMS
(entity, id); ?tWcx;h:>
} <A"T_Rk
>^cP]gGY
publicList findAll(finalClass entity){ %SV5PO@
return getHibernateTemplate().find("from A!([k}@=j
CNC3">Dk~9
" + entity.getName()); jv:!vi:
} |N9::),<
`0l)\
publicList findByNamedQuery(finalString `rt
|5uvmK
namedQuery){ 0 mJvoz\j8
return getHibernateTemplate K;%P_f/KJP
KO`ftz3 +
().findByNamedQuery(namedQuery); k7rFbrLZ
} % D]vKv~<
7M#eR8*[se
publicList findByNamedQuery(finalString query, ?(9/V7HQ.5
s>=DfE-;"
finalObject parameter){ _j$"fg
return getHibernateTemplate ,o$F~KPu
e rz9CX
().findByNamedQuery(query, parameter); 8p4J7 -
} <a)B5B>
`[hc{ynO|
publicList findByNamedQuery(finalString query, X^!n'$^u
{1RI!#[\
finalObject[] parameters){ r(ej=aR
return getHibernateTemplate )E--E+j
)ZxDfRjL
().findByNamedQuery(query, parameters); 8]@)0q {r
} [>5<&[A
#;9I3,@/Y
publicList find(finalString query){ Z(fXN$
return getHibernateTemplate().find ^[K3]*!@
r-M:YB
(query);
U 6((
} k)Y}X)\36
pmm?Fq!s=
publicList find(finalString query, finalObject U} EaV<
^Eu]i
parameter){ 4uQ\JD(*Eu
return getHibernateTemplate().find en"]u,!
6#Ag^A
(query, parameter); !N\<QRb\q
} _zAHN0d
wul$lJ?tE
public PaginationSupport findPageByCriteria K?;_T$^K
T&M*sydA
(final DetachedCriteria detachedCriteria){ $XBn:0U
return findPageByCriteria tUS)1*{_
v'R{lXE
(detachedCriteria, PaginationSupport.PAGESIZE, 0); m5!~PG:_
} ^/nj2"
^*CvKCS
public PaginationSupport findPageByCriteria DuESLMhz
RrFq"
(final DetachedCriteria detachedCriteria, finalint Rne#z2Ok
8v$2*$
startIndex){ XJx$HM&0M
return findPageByCriteria N?xZ]?T
)e#KL$B)v
(detachedCriteria, PaginationSupport.PAGESIZE, =fJDFg
$]V,H"
startIndex); PUt\^ke
} &|/@;EA$8
4o+SSS
public PaginationSupport findPageByCriteria RJpH1XQ
j
O$Wi=5
(final DetachedCriteria detachedCriteria, finalint 1u?h4wC
IM.sW'E
pageSize, nkI+"$Rz0
finalint startIndex){ _n6ge*,E
return(PaginationSupport) !n;0%"(FH
HaJs)j
getHibernateTemplate().execute(new HibernateCallback(){ 9Fo00"q
publicObject doInHibernate xC3h m
{1 VHz])I
(Session session)throws HibernateException { p>4tPI}bf
Criteria criteria = gYeKeW3)
?q^o|Y/
detachedCriteria.getExecutableCriteria(session); xJG&vOf;?
int totalCount = -^1}J
8Zj=:;
((Integer) criteria.setProjection(Projections.rowCount N>R\,n|I
t>hoXn^-
()).uniqueResult()).intValue(); 5yOIwzr&Uu
criteria.setProjection eAU0 8gM.
F$L2bgQR?'
(null); &zuPt5G|
List items =
j,DF' h
#Hn<4g"AjM
criteria.setFirstResult(startIndex).setMaxResults <WXGDCj
NCW<~
(pageSize).list(); q=I8W}Zi
PaginationSupport ps = l#%qF Db
#'DrgZ)W
new PaginationSupport(items, totalCount, pageSize, a0wSXd
#$5"&SM
startIndex); ;(&$Iw9X
return ps; X8}m
%
} /KU9sIE;
}, true); *~h@K Qm7
} {gL8s
7aF'E1e'3
public List findAllByCriteria(final U yb -feG
,/fB~On-
DetachedCriteria detachedCriteria){ QN4{xf:}S
return(List) getHibernateTemplate BlLK6"gJT
.uh>S!X, ]
().execute(new HibernateCallback(){ ]%%I=r
publicObject doInHibernate Z\YCjs%
7 XNZEi9o
(Session session)throws HibernateException { 2XX-
Criteria criteria = ]\~s83?X
8v<802
detachedCriteria.getExecutableCriteria(session); )WBp.j /#
return criteria.list(); c)*,">$#
} ojc m%yd
}, true); g~7x+cu0
} Arr(rM
T!f+H?6
public int getCountByCriteria(final VyMFALSe]h
?l> <?i
DetachedCriteria detachedCriteria){ MG}rvzn@
Integer count = (Integer) V=i/cI\
D`Cy]j
getHibernateTemplate().execute(new HibernateCallback(){ GhJ<L3
publicObject doInHibernate 1"\^@qRv#
!:]/MpQ ?
(Session session)throws HibernateException { {4F=].!
Criteria criteria = HXeX!
+g9CklJ
detachedCriteria.getExecutableCriteria(session); Exb?eHO
return q`Rc \aWB%
La2f]+sV
criteria.setProjection(Projections.rowCount qjm6\ii:)
/f*QxNZ,p
()).uniqueResult(); ;i'mma_!
}
vE~>9
}, true); #+"1">l
return count.intValue(); qWdob>u
} o?{-K-'B$
} [g/ &%n0^
i5*BZv>e
B>;`$-
yI{4h $c
`o4%UkBpM
ykS-5E`
用户在web层构造查询条件detachedCriteria,和可选的 .A Dik}o
*^3&Y@
startIndex,调用业务bean的相应findByCriteria方法,返回一个 qo*%S
;hV-*;>
PaginationSupport的实例ps。 ,I2x&Ys&.
"d; T1
ps.getItems()得到已分页好的结果集 9Ai3p
ps.getIndexes()得到分页索引的数组 CcJ%;.V,T
ps.getTotalCount()得到总结果数 r`\6+ Ntb.
ps.getStartIndex()当前分页索引 d)WGI
RUx
ps.getNextIndex()下一页索引 Ajm
ps.getPreviousIndex()上一页索引 oypF0?!m
N Zu2D
H3xMoSs
u2E}DhV
vWH)W?2
W^,(we
9dO. ,U*`
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 7~qyz]KkE
Xk(p:^ R
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 YlC$L$%Zd.
:^En\YcU
一下代码重构了。 [*K.9}+G_
?:Sqh1-z
我把原本我的做法也提供出来供大家讨论吧: [BTOs4f
"Ng%"Nz
首先,为了实现分页查询,我封装了一个Page类: oFi_
op
java代码: [9C{\t
X|'[\v2ld
Pb}Iiq=
/*Created on 2005-4-14*/ zq'KX/o
package org.flyware.util.page; h:=W`(n5u
{+^&7JX
/** Rn $TYCO
* @author Joa I]-"Tw
* l+#uQo6cqQ
*/ ?~3Pydrb#
publicclass Page { GUps\:ss
7o7*g 7
/** imply if the page has previous page */ | /X+2K}3
privateboolean hasPrePage; C <d]0)
n[gc`#7|{e
/** imply if the page has next page */ Ez+8B|0P
privateboolean hasNextPage; NydF'N_1
no,b_0@N
/** the number of every page */ {Rz(0oD\
privateint everyPage; O?f?{Jsx
u\3=m%1
/** the total page number */ -`CE;
privateint totalPage; {%D4%X<
pG^>y0
/** the number of current page */ uC|bC#;
privateint currentPage; %$&_!
WS.lDMYE7
/** the begin index of the records by the current QKI g5I-
a] P0PH~
query */ \gGTkH
privateint beginIndex; V
X.9mt
Aj*|r
XC!Y {lp
/** The default constructor */ f_z]kA
+H
public Page(){ T2_b5j3i
E/hO0Ox6
} Y^QG\6q
3~\,VO''
/** construct the page by everyPage H}cq|hodn
* @param everyPage 'd]t@[#
* */ .wPI%5D
public Page(int everyPage){ bl-D{)X
this.everyPage = everyPage; GE*%I1?]
} v(]dIH
Q"QZ^!zRl
/** The whole constructor */ 98*C/=^TH{
public Page(boolean hasPrePage, boolean hasNextPage, 6lm<>#_
moCR64n
I`nC\%g
int everyPage, int totalPage, YRyaOrl$<
int currentPage, int beginIndex){ skF}_
this.hasPrePage = hasPrePage; fuT Bh6w&
this.hasNextPage = hasNextPage; -
WQ)rz
this.everyPage = everyPage; zym6b@+jN
this.totalPage = totalPage; g'NR\<6A
this.currentPage = currentPage; 0|| 5r#
this.beginIndex = beginIndex; 32p9(HQ
} ,rX|_4n*
~Kt2g\BSok
/** 9vBW CCf
* @return ,7)zavA
* Returns the beginIndex. Ud_0{%@
*/ xk7VuS*
publicint getBeginIndex(){ _Mi*Fvj
return beginIndex; > .K
} lv#L+}T
?(Xy 2%v
/** 3b/J
* @param beginIndex SNC)cq+{
* The beginIndex to set. Jo\karpb
*/ 8(]q/g"O
publicvoid setBeginIndex(int beginIndex){ Q[9W{l+
this.beginIndex = beginIndex; _~ 3r*j
} p2hPLq
^@)*voP#G
/** v}. ~m)
* @return Lb~'
I=9D
* Returns the currentPage. %GGSd0
g
*/ ]]T,;|B
publicint getCurrentPage(){ P} w0=
return currentPage; 2>g!+p Ox
} MaZVGrcC
hV NT
/** ,M Ugww!.
* @param currentPage lL,0IfC,
* The currentPage to set. 4'y@ne}g!
*/ |?v+8QL,;t
publicvoid setCurrentPage(int currentPage){ Oo/@A_JO@
this.currentPage = currentPage; Y+gNi_dE
} W$J@|i
usw(]CnH
/** !O4)YM
* @return q!WiX|P
* Returns the everyPage. }?*$AVs2q
*/ 'VV"$`Fu"
publicint getEveryPage(){ <CWOx&hr
return everyPage; tlgg~MViS
} @2sr/gX^
71Y3.1+
/** _
Gkb[H&RZ
* @param everyPage ;Q<2Y#
* The everyPage to set. v!#koqd1y.
*/ _$yS4= .
publicvoid setEveryPage(int everyPage){ @v/
8}n
this.everyPage = everyPage; |$[.X3i
} e\}'i-
8peK[sz
/** 9O\yIL
* @return /d>Jkv
* Returns the hasNextPage. dB8 e
*/ '`&b1Rc
publicboolean getHasNextPage(){ G@U}4'V9
return hasNextPage; 91UC>]}H
} e"ClG/M_XS
j07b!j:"\}
/** } a!HbH
* @param hasNextPage cHJ4[x=
* The hasNextPage to set. L$?YbQo7
*/ A~;+P
publicvoid setHasNextPage(boolean hasNextPage){ 2>)::9e4
this.hasNextPage = hasNextPage; P}vk5o'
} ,Y@4d79
IO"q4(&;P4
/** yY!@FGsA
* @return o4,9jk$
* Returns the hasPrePage. ^2nH6,LPS
*/ %-an\.a.
publicboolean getHasPrePage(){ q*}$1 zb
return hasPrePage; B-wF1!Jv
} HBZtg
5>-~!Mg1
/** " ,]A.,
* @param hasPrePage j|VX6U
* The hasPrePage to set. j3fq}>=
*/ B %
publicvoid setHasPrePage(boolean hasPrePage){
AIw~@*T
this.hasPrePage = hasPrePage; |5*:ThC[
} <W/YC2b
# (-?i\i
/** [ub)`-6 u
* @return Returns the totalPage. 58]t iP"
* 0+k=gO
*/ vkLyGb7r<
publicint getTotalPage(){ c
LfPSA
return totalPage; E0eZal],
} Dk}txw}#
5KW
n >n
/** 6>[J^k%~w)
* @param totalPage L"}2Y3
* The totalPage to set. \cQ+9e)
*/ bLO^5` 6
publicvoid setTotalPage(int totalPage){ 3A3WD+[L
this.totalPage = totalPage; pEY zB;
} =91f26c!~
|&~);>Cq2
} wvH*<,8Vq
'&Tz8.jp~
nM`pnR_
7lAn GP.;
q5.5%W
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 ^geY Ay
F ZN}T{<
个PageUtil,负责对Page对象进行构造: 5G=fJAG
java代码: ZBjb f_M:
E#\'$@8j
NYPjN9L
/*Created on 2005-4-14*/ I9YMxf>nI
package org.flyware.util.page; rji<g>GQ
j#9n.i
%h
import org.apache.commons.logging.Log; vH@b
import org.apache.commons.logging.LogFactory; G4"n`89LK
Se[>z(
/** k!!d2y6
* @author Joa ]C>h_,EZc
* %Z yt;p2
*/ jtPHk*>^wu
publicclass PageUtil { q^b12@.
vZIx>
privatestaticfinal Log logger = LogFactory.getLog o'ZW
:-j/Y'H_
(PageUtil.class); /Tp>aW%}"
+[#^c3x2
/** fAD
{sg
* Use the origin page to create a new page {%z5^o1)
* @param page 7/bF04~%
* @param totalRecords la{o<||Aq
* @return lht :%Ts$
*/ `91?^T;\F
publicstatic Page createPage(Page page, int l(~NpT{=V
C{YTHNn
totalRecords){ :(i=> ~O
return createPage(page.getEveryPage(), XZxzw*Y1J
Wbi12{C
page.getCurrentPage(), totalRecords); ^F-AZP
/5F
} <#lNi.?.
6^TWY[z2%
/** dbfI!4
* the basic page utils not including exception Cp#}x1{
PBAQ
KQ
handler 'L2[^iF9
* @param everyPage Jy0(g T
* @param currentPage |qb-iXW=
* @param totalRecords &IFXU2t}
* @return page
<^adt
*m
*/ f4^\iZ{`G
publicstatic Page createPage(int everyPage, int {QT:1U\.
s+a#x(7{
currentPage, int totalRecords){ tS[@?qP
everyPage = getEveryPage(everyPage); 1pTQMf a
currentPage = getCurrentPage(currentPage); J!iKW
int beginIndex = getBeginIndex(everyPage,
bRx}ih
Bacmrf
currentPage); n;r
W
int totalPage = getTotalPage(everyPage, HG)h,&nc-
8b $e)
totalRecords); 03 ;L
boolean hasNextPage = hasNextPage(currentPage, S,#UA%V"
nk+9J#Gs
totalPage); 0;" >.
boolean hasPrePage = hasPrePage(currentPage); O_Z
n ZzGak
returnnew Page(hasPrePage, hasNextPage, IR"=8w#MP
everyPage, totalPage, ~.Cu,>fV
currentPage, -7m7.>/M
xUDXg*
beginIndex); G V% @A
} y{QF#&lW
-aIB_
privatestaticint getEveryPage(int everyPage){ <2fvEW/#v
return everyPage == 0 ? 10 : everyPage; i$z*~SuM#
} e;&f