Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 'RRmIx2X
ST\$=
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 0#w?HCx=
"Rn3lj0
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 |D, +P
JkW9D)6
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 a=M\MZK>
;"(foY"L
。 fRg`UI4w}
I%-
" |]$
分页支持类: t]7&\ihZi~
n6s}ww)
java代码: n1!?"m!
(Qa/EkE^*w
Cmc3k,t
package com.javaeye.common.util; foJdu+^
\
[a%('}
import java.util.List; sR/b$j>i3
': N51kC
publicclass PaginationSupport { FQ
g~l4WX
EEGy!bff
publicfinalstaticint PAGESIZE = 30; ZPbpp@,
nstUMr6
privateint pageSize = PAGESIZE; 6iCrRjY*
B6wRg8
privateList items; | WvU q
D9j3Xu
privateint totalCount; Q}-~O1
dtp oU&?6s
privateint[] indexes = newint[0]; =[F<7pvE
\&H nKhI
privateint startIndex = 0; aN"DkUYZM
/yM:|`tT
public PaginationSupport(List items, int L!=QR8?@E
~gGZmTb
totalCount){ 4:U?u
setPageSize(PAGESIZE); _YF%V;X
setTotalCount(totalCount); 6/rFHY2q
setItems(items); X7s
`U5'l
setStartIndex(0); ^tXJj:wtS
} zbq@pj)Qu
6R=W}q4
public PaginationSupport(List items, int Q+YRf3$
J~#;<e{\"
totalCount, int startIndex){ D1__n6g[
setPageSize(PAGESIZE); w8n|B?Sr
setTotalCount(totalCount); )B[0JrcE
setItems(items); P*cNh43U
setStartIndex(startIndex); ;[fw]P n
} s`0QA!G{-
ki85!k=Q2
public PaginationSupport(List items, int % LJs
J>/w5$h5
totalCount, int pageSize, int startIndex){ \Ym5<];E
setPageSize(pageSize); x
g0iN'e'K
setTotalCount(totalCount); ,_Z+8
setItems(items); j?MAED
setStartIndex(startIndex); :_O%/k1\@
} ;<leKcvhQ&
fMOU$0]$<
publicList getItems(){ \EVBwE,
return items; 6L)%T02C
} q5?# 3 T=
b,CaWg
publicvoid setItems(List items){ @HOBRRm`
this.items = items; ~JaAii{
} %Ah^E$&n2
y3h/IpT
publicint getPageSize(){ -{ H0g]
return pageSize; ;UxP
Kpl
} ONe# rKJ_
^k9kJ+x^S2
publicvoid setPageSize(int pageSize){ K"r*M.P>
this.pageSize = pageSize; y~FV2$
} &}A[x1x06)
gSh+}r<7
publicint getTotalCount(){ M8tRjNWS?
return totalCount; ~J P=T
} 1R,:
l(02W
publicvoid setTotalCount(int totalCount){ |9B.mBoX
if(totalCount > 0){ m%76i;uP
this.totalCount = totalCount; ~8]NK&J
int count = totalCount / 7x@A%2J
YxP&7oq
pageSize; 7(5
4/
if(totalCount % pageSize > 0) >"C,@cN}B
count++; 62Z#YQ}x
indexes = newint[count]; [Nk3|u`h
for(int i = 0; i < count; i++){ )BwjZMJ.N
indexes = pageSize * +t?3T-@Ks
Xwhui4'w
i; ( vca&wI!
} 7R`mf
}else{ Nd;Ku6
this.totalCount = 0; hC\6-
0u
} 49vcoHlf
} Qc pm!
IyPwP*A
publicint[] getIndexes(){ :AE&Ny4
return indexes; <>8WQn,K
} ` eXaT8
'nwx9]q
publicvoid setIndexes(int[] indexes){ & 9<+;*/
this.indexes = indexes; w'm;82V:P-
} /C6k+0ApMT
w'UVKpG+
publicint getStartIndex(){ {QwHc5Bf
return startIndex; @0F3$
} ?nmn1`UT
`I3r3WyA
publicvoid setStartIndex(int startIndex){ r.BIJt)
if(totalCount <= 0) 0}CGuws
this.startIndex = 0; \Rp-;.I@6
elseif(startIndex >= totalCount) * cgI.+
this.startIndex = indexes ?W)A
vMm1Z5S/
[indexes.length - 1]; lGOgN!?i
elseif(startIndex < 0) Vb= Mg
this.startIndex = 0; ;NHt7p8SE
else{ RR]CW
this.startIndex = indexes tfGHea)M
xjVS
[startIndex / pageSize]; <UQe.K"
} Ipf=ZD
} ;9c<K
&MCbYph,
publicint getNextIndex(){ P3=W|81e
int nextIndex = getStartIndex() + ,=#F//
ayfFVTy1d
pageSize; &8vCZN^
if(nextIndex >= totalCount) < Pky9o;
return getStartIndex(); 9;B0Mq
py
else <x<"n t
return nextIndex; ;u>DNG|.
} `nZ )>
RE/~#k@a
publicint getPreviousIndex(){ 1fZ(l"
int previousIndex = getStartIndex() - u)~C;f)
zc;|fHW~O
pageSize; E<Q
f!2s$
if(previousIndex < 0) RH&~+5
return0; U4b0*` o
else iT%} $Lu~
return previousIndex; yc?a=6q'm
} }#n;C{z2e
orjj'+;X
} k@z,Iq8
bp~g;h*E2
`pGa~!vl
\Ol kM<
抽象业务类 _tYx~J2.Q
java代码: BS:+~| 3w
yge,8i)c
{o.FlX
/** U
15H2-`
* Created on 2005-7-12 4#:W.]U8
*/ ;{U@qQD7
package com.javaeye.common.business; O4og?h>
y9>ZwYN
import java.io.Serializable; ~2gG(1%At9
import java.util.List; s=0BMPDgm
~Hr}]
import org.hibernate.Criteria; j'MO(ev
import org.hibernate.HibernateException; &3n~%$#N
import org.hibernate.Session; HBu[gh;b
import org.hibernate.criterion.DetachedCriteria; LdL/399<
import org.hibernate.criterion.Projections; Wwr;-Qa}g
import w tiny,6
d'G0m9u2
org.springframework.orm.hibernate3.HibernateCallback; 6jC`8l:
import ]zWon~
4X+ifZO
org.springframework.orm.hibernate3.support.HibernateDaoS Y07ZB'K
!'cl"\h
upport; 5'X ]k@m_
K*X_FJ
import com.javaeye.common.util.PaginationSupport; P_Gw-`L5T
RT.D"WvT
public abstract class AbstractManager extends -UOj>{-
d~JKH&x<
HibernateDaoSupport { !BOY@$Y
%)0*&a 4
privateboolean cacheQueries = false; 4}eepJOn
qa0 yg8,<
privateString queryCacheRegion; $>u*}X9
{z")7g ]l
publicvoid setCacheQueries(boolean {l/-LZ.
2kIa*#VOJ
cacheQueries){ z$?~Y(EY
this.cacheQueries = cacheQueries; f]\CD<g3|E
} 2C9V|[U,
br":y>=,
publicvoid setQueryCacheRegion(String 8&)DE@W
IHcD*zQ
queryCacheRegion){ -6n K<e`
this.queryCacheRegion = X ><?F|#7T
HLV2~5Txc
queryCacheRegion; !3*(N8_|#
} mg$]QnbAnH
`CgaS#
publicvoid save(finalObject entity){ P dhEQ}H
getHibernateTemplate().save(entity); s#)5h0t#du
} <7j87
BA%pY|"Q
publicvoid persist(finalObject entity){ --|Wh^i>?
getHibernateTemplate().save(entity); WYEKf9}
} k6sI
L3QJ0
3 G`aHTWk
publicvoid update(finalObject entity){ z6w3"9Um
getHibernateTemplate().update(entity); ).sRv6/c
} lna}@]oR
=A!@6Nw
publicvoid delete(finalObject entity){ .`4{9?bR
getHibernateTemplate().delete(entity); g!+|I
} bqnNLs<N
"hzB9*"t
publicObject load(finalClass entity,
/#VhkC _
t\%HX.8[;%
finalSerializable id){ ~1W x=
return getHibernateTemplate().load }}>q2y
32/MkuY^u
(entity, id); ,z-}t&
_t
} K%F,='P}
AigS!-
publicObject get(finalClass entity, S/ODqL|
nysUZB
finalSerializable id){ w6{TE(]zp
return getHibernateTemplate().get Y[$!`);Ye
\8?Tdx=
(entity, id); * Of4o
} Z`KC%!8K
ysQ,)QoiR{
publicList findAll(finalClass entity){ f-E("o
return getHibernateTemplate().find("from t 0|!(3
}5}.lJ:
" + entity.getName()); =W BTm
} 7zSLAHW
lMg+R<$~I
publicList findByNamedQuery(finalString j+["JXy
Ux}(?Z
namedQuery){ B hp-jq'!B
return getHibernateTemplate _PlKhv}
)Cc q4i
().findByNamedQuery(namedQuery); pXtX jb
} j{9D{
nAjO6g6E
publicList findByNamedQuery(finalString query, 2|}+T6_q
Q^e}?v%=%3
finalObject parameter){ Y<Fz)dQo
return getHibernateTemplate {O`w,dMOI
'4|-9M3f
().findByNamedQuery(query, parameter); }9W4"e 2)
}
?l^1 *Q,
_q{c##Kf
publicList findByNamedQuery(finalString query, Ko&>C_N
=yyp?WmC8
finalObject[] parameters){ =aoMii
return getHibernateTemplate j"'(sW-
m|:_]/*qE
().findByNamedQuery(query, parameters); T2!6(,
s9
} /x[jQM\
7|[mz> "d
publicList find(finalString query){ @>)r}b
return getHibernateTemplate().find yX0dbW~@y
P:aJ#
(query); .sj^{kGE
} ek}a}.3 {
zOa_X~!@
publicList find(finalString query, finalObject V*iH}Y?^p
L G1r]2
parameter){ )Hk3A$6(
return getHibernateTemplate().find eK!V
);
IuRmEL_Q_
(query, parameter); [ zEUH:9D
} )_i
qAqkS
vbD{N3p)?n
public PaginationSupport findPageByCriteria YGPy@-,E
Wv/%^3
(final DetachedCriteria detachedCriteria){ (m:Zk$
return findPageByCriteria Oms. e
dOoK Lry
(detachedCriteria, PaginationSupport.PAGESIZE, 0); Jh?dw3Ai^
} !gv`FE9y
X6mqi;+
public PaginationSupport findPageByCriteria +[tE ^`-F
v>-VlQ
(final DetachedCriteria detachedCriteria, finalint dnb)/
n_(/JE>
startIndex){ PX
n;C/
return findPageByCriteria AG?dGj^
OI0;BBZ
(detachedCriteria, PaginationSupport.PAGESIZE, d~`x )B(
JMz;BAHT
startIndex); 7e#?e+5+A
} Tp_L%F
KFvQ
public PaginationSupport findPageByCriteria %d(^d
.%Ta]!0
(final DetachedCriteria detachedCriteria, finalint Y>E zTV
w`il=ZAC
pageSize, 0Emr<n
finalint startIndex){ q"<ac qK
return(PaginationSupport) (Xq)p y9
)Ib<F7v
getHibernateTemplate().execute(new HibernateCallback(){ -:Ia^{YN
publicObject doInHibernate cgm~>
L.1_(3NG
(Session session)throws HibernateException { 0;:.B
j
Criteria criteria = Wr3mQU
cnFI
&,FM
detachedCriteria.getExecutableCriteria(session); \e'R@
int totalCount = <p\6AnkMr
g)_e]&
((Integer) criteria.setProjection(Projections.rowCount |*'cF-lp6v
MF'$~gxo
()).uniqueResult()).intValue(); .Jrqm
criteria.setProjection ghX|3lI\q
0DmMG
(null); (h5'9r
List items = G_k~X"
!2'jrJGc
criteria.setFirstResult(startIndex).setMaxResults -sjd&)~S[
pm\x~3jHs
(pageSize).list(); -"h;uDz|z
PaginationSupport ps = !\"5rNy
MV\|e1B}
new PaginationSupport(items, totalCount, pageSize, HaYE9/xS
"E8zh|m o
startIndex); J]G?Rc
return ps; =RAh|e
} ALNc'MW!
}, true); Ju3*lk/j-
} 1QU:?_\6@t
c=L2%XPP
public List findAllByCriteria(final Jnna$6G)B
L\&<sy"H
DetachedCriteria detachedCriteria){ Sk:ws&D1u
return(List) getHibernateTemplate t0nI ('LX,
NyVnA
().execute(new HibernateCallback(){ N#Zhxu,g!
publicObject doInHibernate ^H2-RBE#
20iq2
(Session session)throws HibernateException { :w<V
Criteria criteria = )YX 'N<[
q*7zx_ o
detachedCriteria.getExecutableCriteria(session); yI ld75S`
return criteria.list(); eXKo.JL
} =ZDAeVz3w
}, true); sm\f0P!rv
} 9P~\Mpk
+H9 >A0JF
public int getCountByCriteria(final "ajjJ"x A
pDh{Z g6t
DetachedCriteria detachedCriteria){ 8g:;)u4$P
Integer count = (Integer) BVr0Gk
GW$.lo1|)
getHibernateTemplate().execute(new HibernateCallback(){ &g.+V/<[
publicObject doInHibernate L. EiO({W
VA9Gb9
(Session session)throws HibernateException { e#Z$o($t
Criteria criteria = tX@_fYb
F8uNL)gKj)
detachedCriteria.getExecutableCriteria(session); kH4Ai3#g
return E/09hD Q
"bm
criteria.setProjection(Projections.rowCount PC[c/CoD
B';6r4I-
()).uniqueResult(); XP1~d>j
} XvE9b5}
}, true); rN%F)
q#
return count.intValue(); 7hi"6,
} V\{tmDE
} h-m\% |D
)*Q-.Je/U
xw3YK!$sIF
6X\ 2GC9
=Apxdnz,
66'?&Xx'
用户在web层构造查询条件detachedCriteria,和可选的 :J:,m
TP"1\O
startIndex,调用业务bean的相应findByCriteria方法,返回一个 %^8^yZz
RtCkV xaEx
PaginationSupport的实例ps。 5e}A@GyC
OzQ -7|m'J
ps.getItems()得到已分页好的结果集 ]Lm9^q14m
ps.getIndexes()得到分页索引的数组 7yx$Nn`(
ps.getTotalCount()得到总结果数 >A<bBK#
ps.getStartIndex()当前分页索引 v k?skN@
ps.getNextIndex()下一页索引 <7n4_RlF!
ps.getPreviousIndex()上一页索引 qpsvi.S
a?6ab+7#
[ e8x&{L-_
Vm df8[5
n':! ,a[
.p=sBLp8
*0}3t<5
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ^kgBa2 7
.-IkL|M
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 8?i7U<CB
(&P9+Tl
一下代码重构了。 0q*r
kdCP
我把原本我的做法也提供出来供大家讨论吧:
(:";i&
`KCh*i
首先,为了实现分页查询,我封装了一个Page类: Da v PYg
java代码: *$"gaXI
|0\0a&tkPl
Hw|AA?,0-
/*Created on 2005-4-14*/ u@.>Z{h
package org.flyware.util.page; aj"M>zd*}
RKa}$
7
/** ZWm8*}3]7_
* @author Joa J8"[6vI d~
* [b/k3&O'
*/ tBm_YP[
publicclass Page { H> '>3]G
Hzhceeh_+
/** imply if the page has previous page */ e+]6OV&+
privateboolean hasPrePage; m "M("%
ncX/L[L
/** imply if the page has next page */ <d<mvXbw_@
privateboolean hasNextPage; 3VUWX5K?
^47PLLRP
/** the number of every page */ sT/c_^y
privateint everyPage; u1~9{"P*
%\kOLE2`
/** the total page number */ &tZG
@
privateint totalPage; [Cb`{
NziZTU}
/** the number of current page */ -\y-qHgb/
privateint currentPage; 'Vr$MaO
o d7]tOK9
/** the begin index of the records by the current xESjM1A)
_6k*'aT~FK
query */ 2~*Ez!.3
privateint beginIndex; X<MO7I
7nVRn9Hn
WH$e2[+Y
/** The default constructor */ F*Z=<]<+
public Page(){ $XU5??8
"iM~Hy
} K9kUS
NB7Y{)
w
/** construct the page by everyPage .,i(2^
* @param everyPage *1'`"D~
* */ QnI.zq
V
public Page(int everyPage){ >?]_<:
this.everyPage = everyPage; y?)}8T^
} J j=;
WA$>pG5s
/** The whole constructor */ ]u-02g
public Page(boolean hasPrePage, boolean hasNextPage, z**hD2R!
oR~e#<$;
97,rE$bC
int everyPage, int totalPage, YxGcFjJ
int currentPage, int beginIndex){ Otz E:qe
this.hasPrePage = hasPrePage; -L3|&