Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 XZhuV<
6
?FF!x
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 9cud CF
zz3Rld!b[
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 j+NOT`&
((F[]<?
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 1?sR1du,
Ol3$!x9
。 B;?)
X(kyu,w
分页支持类: O0Y/y2d
@SeE,<
java代码: j4Ppn
We%-?l:"
Q.Uyl:^PxU
package com.javaeye.common.util; 0\#uxzdhJ
I)I,{xT4
import java.util.List; i&\N_PUm[
5fuOl-M0W
publicclass PaginationSupport { .dwb@$
6T0[
~@g5
publicfinalstaticint PAGESIZE = 30; LM}0QL
m?
*&{M,
privateint pageSize = PAGESIZE; {^ 1s
JnE\E(ez
privateList items; .q#2 op
zk= 3L} C
privateint totalCount; T<kyxbjR
JTB_-J-TU
privateint[] indexes = newint[0]; e8O[xM
m,',luQ
privateint startIndex = 0; $ KQ7S>T
=FUORj\O
public PaginationSupport(List items, int i{TErJ{}e
I@~hz%'
totalCount){ s,>1n0a
setPageSize(PAGESIZE); -I4-K%%B`
setTotalCount(totalCount); LyR to
setItems(items); &g;4;)p*8
setStartIndex(0); 7bOL ,S
} 8&: *<
bv,_7UOG
public PaginationSupport(List items, int ?<VahDBS+A
~]8bTw@
totalCount, int startIndex){ !~PLW] Z4
setPageSize(PAGESIZE); 1^rODfY 0
setTotalCount(totalCount); z 3)pvX5
setItems(items); ?zp@HSa9
setStartIndex(startIndex); IBm&a^
} uSp=,2)
gK7j~.bb"
public PaginationSupport(List items, int N}Ozm6Mc
NY(c4fzl
totalCount, int pageSize, int startIndex){ zB`)\
setPageSize(pageSize); aY7kl
setTotalCount(totalCount); 4SSq5Ve<
setItems(items); (r,tU(
setStartIndex(startIndex); ];bB7+
} cU7 c}?J<
KY$6=/?U_
publicList getItems(){ 4KF
1vw
return items; 99 /fI
} ~_=ohb{
O{hGh{y
publicvoid setItems(List items){ "P;_-i9O
this.items = items; 4Sv&iQ=vh
} Z[:fqvXQ
s8iJl+Jm
publicint getPageSize(){ M?pu7wa
return pageSize; xb$eFiQ
} +V*FFv
Q)x`'[3"7W
publicvoid setPageSize(int pageSize){ ma.yI};$
this.pageSize = pageSize; zn|~{9>y
} {:M5t1^UC
R4=n">>Q
publicint getTotalCount(){ {#YGor|
return totalCount; .lm^ +1}r
} b6BeOR*ps
RMU]GCa
publicvoid setTotalCount(int totalCount){ zMasA
if(totalCount > 0){ o =)hUr
this.totalCount = totalCount; I8
Ai_^P
int count = totalCount / mf]1mG})
51 3{oM:
pageSize; |KFRC)g
if(totalCount % pageSize > 0) >en,MT|
count++; Fa78yY+6
indexes = newint[count]; #MYhKySku
for(int i = 0; i < count; i++){ T1yJp$yD"
indexes = pageSize * Kj;gxYD>6
$8#zPJR&
i; z;`o>Ja2
} {~7VA
}else{ KsI[
this.totalCount = 0; ((L=1]w
} gE8p**LT+
} bQc-ryC+.
yZFm<_9>
publicint[] getIndexes(){ [U[saR\
return indexes; dX|(n.}
} \5.36Se
3D>syf
publicvoid setIndexes(int[] indexes){ LO{{3No
this.indexes = indexes; w7}m
T3p,)
} ]&%_Fpx
ta\AiHm
publicint getStartIndex(){ _/0vmgQ&
return startIndex; tpp. 9
} =9@{U2 =l
3n-~+2l
publicvoid setStartIndex(int startIndex){ 9fR`un)f}
if(totalCount <= 0) y\7 -!
this.startIndex = 0; 3}{od$3G
elseif(startIndex >= totalCount) Yg@k+
this.startIndex = indexes "e<Z$"7i
J*s!(J |Q
[indexes.length - 1]; j8kax/*[
elseif(startIndex < 0) MzLnD D^
this.startIndex = 0; W]cJP
else{ A}K RXkB
this.startIndex = indexes e\%emp->
|#^##^cF/
[startIndex / pageSize]; gB1w,96J
} H(bR@Qok
} ab4(?-'-
L h"K"Uv
publicint getNextIndex(){ YI!ecx%/4
int nextIndex = getStartIndex() + & yFS
O^(ji8[l
pageSize; E _d^&{j
if(nextIndex >= totalCount) MU2ufKq4)
return getStartIndex(); GZgu1YR
else K
cI'P(
return nextIndex; PScq-*^
} t.'| [pOV
|E:q!4?0
publicint getPreviousIndex(){ 9AQMB1D*v4
int previousIndex = getStartIndex() - LlAMtw"
Cz@[l=-T7
pageSize; h">L>*Wfx
if(previousIndex < 0) hkOhY3K5
return0; W8hf
Qpw
else c\.Hs9T >
return previousIndex; T;/Y/Fd
} ?`R;ZT)U-
ZZ/F}9!=
} <n+?7`d,
)Zx;Z[
#P[d?pY
oJ}!qrrH
抽象业务类 Qu4Bd|`(k
java代码: et[n ;nl>V
6`(x)Q9
w6ZyMR,T
/** Y>v(UU
* Created on 2005-7-12 D|`O8o?)
*/ zq ;YE
package com.javaeye.common.business; {s^vAD<~x3
Bn>"lDf,
import java.io.Serializable; nff
X
import java.util.List; Kgev*xg
g *}M;"
import org.hibernate.Criteria; Imi;EHW
import org.hibernate.HibernateException; yU"pU>fV@
import org.hibernate.Session; $
{29[hO
import org.hibernate.criterion.DetachedCriteria; |ymw])L
import org.hibernate.criterion.Projections; WDznhMo
import b[}f]pB@n
'n1-?T)
org.springframework.orm.hibernate3.HibernateCallback; QkMK\Up
import
c@p4,G
Y`$dtg {
org.springframework.orm.hibernate3.support.HibernateDaoS AUCk]
p(B>
N!:
upport; 1CS[%)-c
70s.
import com.javaeye.common.util.PaginationSupport; t;?M#I\,{
;+pS-Zb
6
public abstract class AbstractManager extends XN+~g.0
"VEA71
HibernateDaoSupport { frB~ajXK
v2X>%
privateboolean cacheQueries = false; Mf [v 7\
'9O4$s1
privateString queryCacheRegion; uCX+Lw+As
Skm$:`u;
publicvoid setCacheQueries(boolean V5$J
<HReh>)[
cacheQueries){ cb ICO
this.cacheQueries = cacheQueries; +n#(QOz
} a>w@9
*=+m;%]_
publicvoid setQueryCacheRegion(String C)w11$.YQ9
d1&RK2
queryCacheRegion){ <A% }
this.queryCacheRegion = 'rWu}#Nb
Mlr]-Gu5Z
queryCacheRegion; !VNLjbee.
} Vn:BasS%
kGaK(^w
publicvoid save(finalObject entity){ QL_~E;U
getHibernateTemplate().save(entity);
{@XzY>
} )"Ef* /+
kJ^)7_3
publicvoid persist(finalObject entity){ oSGx7dj+
getHibernateTemplate().save(entity); EP!zcp2' C
} EvA{@g4>
n%N|?!rB
publicvoid update(finalObject entity){ #9HQW:On
getHibernateTemplate().update(entity); Ww(($e!
} @|yRo8|
']'H8Y-M
publicvoid delete(finalObject entity){ }o>6 y>=
getHibernateTemplate().delete(entity); zGm#erE
}
"rnZ<A}
y,I ?3p|S
publicObject load(finalClass entity, D%PrwfR
r&^LSTU0!
finalSerializable id){ &c;@u?:@S
return getHibernateTemplate().load 3$cIm+
>0#WkmRY
(entity, id); \tL9`RKpg
} G$hH~{Y$
<:v2N/i
publicObject get(finalClass entity, #;4afj:2g
Z0fl]3p
finalSerializable id){ )(&Z&2~A
return getHibernateTemplate().get gY)NPi}!`
qU ESN!
(entity, id); a'sa{>
} /^#8z(@B
^]iIvIp
publicList findAll(finalClass entity){ G@4ro<
return getHibernateTemplate().find("from {|Ew]Wq
6[q<%wA
" + entity.getName()); desrKnY
} :o!bz>T
:?!kZD!
publicList findByNamedQuery(finalString .f+ul@o
tS$^k)ZXip
namedQuery){ O\=U'6@
return getHibernateTemplate pn},o vR;
"O`{QVg:
().findByNamedQuery(namedQuery); AsBep
} 942(a
Ww8C}2g3
publicList findByNamedQuery(finalString query, PS*=MyNa
fn6;
finalObject parameter){ 7/p&]0w
return getHibernateTemplate T]&%
KQ
~;m3i3D
().findByNamedQuery(query, parameter); ^TC<_]7
} HM'P<<
3['aK|qk.
publicList findByNamedQuery(finalString query, y">_$
+/">]QJ
finalObject[] parameters){ %t*_Rtz\o
return getHibernateTemplate L|O'X4"&_
Qktj
().findByNamedQuery(query, parameters); $d<vPpJ3
} Ek0zFnb[Gx
}|MPQy
publicList find(finalString query){ Im7t8XCG
return getHibernateTemplate().find RyI(6TZl
Gp0B^^H$
(query); zQ;jaS3hf
} AKKp-I5
jm|x=s3}h
publicList find(finalString query, finalObject --(e(tvf
jgcI|?yL
parameter){ \v7->Sy8
return getHibernateTemplate().find QkEIV<T&)l
F XpI-?#E<
(query, parameter); ]n8
5.DF
} r8o9C
g{t)I0xm
public PaginationSupport findPageByCriteria '}\#bMeObg
jFa{h!
(final DetachedCriteria detachedCriteria){ '<Nhq_u{
return findPageByCriteria TFIP>$*_C
(?9 @nS
(detachedCriteria, PaginationSupport.PAGESIZE, 0); f)~j'e
} ?Ek 3<7d
3Kv~lo^
public PaginationSupport findPageByCriteria h KZ<PwBi
Bh'_@PHP
(final DetachedCriteria detachedCriteria, finalint !=C74$TH
3#=%2\
startIndex){ wt8?@lJ"/
return findPageByCriteria q 9cN2|:
\Vc-W|e
(detachedCriteria, PaginationSupport.PAGESIZE, @
m' zm:
xJ2DkZ
startIndex); z0@{5e$#Y
} oWJ0>)
q%G"P*g$(
public PaginationSupport findPageByCriteria Dz<"eyB\
;y"=3-=vM"
(final DetachedCriteria detachedCriteria, finalint AW;ncx;
=Nyq1~
pageSize, j_3X
1w)k
finalint startIndex){ mes/gqrJ1I
return(PaginationSupport) V30Om3C
w=dTa5
getHibernateTemplate().execute(new HibernateCallback(){ ,YEwz3$5u
publicObject doInHibernate 2j9+ f{ l
S<
TUZ
/;
(Session session)throws HibernateException { )SX2%&N
Criteria criteria = @-L4<=$J
7GY3_`
detachedCriteria.getExecutableCriteria(session); Ne 2tfiI`
int totalCount = Thlqe?
N ,8^AUJ3&
((Integer) criteria.setProjection(Projections.rowCount _LVi}mM
rc_K|Df
()).uniqueResult()).intValue(); bgi
B*`z
criteria.setProjection 6RA4@bIG
Ys+2/>!
(null); u$vA9g4
List items = 4[&L<D6h
m%=]
j<A
criteria.setFirstResult(startIndex).setMaxResults vpnOc2 -
+>w %j&B
(pageSize).list(); ~d9R:t1
PaginationSupport ps = lQkCA-
vr:5+wew
new PaginationSupport(items, totalCount, pageSize, .B9i`)0
|
Ns-l
(l
startIndex); E`M, n,
return ps; n`W7g@Sg#I
} Rxl )[\A*
}, true); n7CwGN%
} lhp.zl
^V5VRGq
public List findAllByCriteria(final JemB[
Te\i;7;4u
DetachedCriteria detachedCriteria){ pGwBhZnb>
return(List) getHibernateTemplate 2r =8&~9z
\$Jz26
-n
().execute(new HibernateCallback(){ ./Y5Vk#Rp\
publicObject doInHibernate P+9%(S)L3
i]8 +JG6
(Session session)throws HibernateException { y3^>a5z!x
Criteria criteria = acPX2B[jJ
v`G [6Z
detachedCriteria.getExecutableCriteria(session); ees^j4
return criteria.list(); w~}*MsB
} 9fj8r3 F#
}, true); eeOE\
} 0@BhRf5
::&hfHR*P
public int getCountByCriteria(final lD K<gd
t XbMP
DetachedCriteria detachedCriteria){ rQrh(~\:
Integer count = (Integer) @v:p)|Ne;
(E*pM$
getHibernateTemplate().execute(new HibernateCallback(){ /x2MW5H
publicObject doInHibernate xDsB%~
A;ti$jy
(Session session)throws HibernateException {
M%aA1!@/
Criteria criteria = E
U#
M.
hFiJHV
detachedCriteria.getExecutableCriteria(session); v\#1&</qd^
return Z%_m<Nf8T
$K'A_G^
criteria.setProjection(Projections.rowCount f ^vz
@i9eH8lT
()).uniqueResult(); 8-"lK7
} 1OwVb
}, true); #P^cR_|\
return count.intValue(); It@1!_tO2
} MlVVST
} u?a4v \
P c'0.4
:JI&ngWK
fRow@DI\
i& phko}
1dE|q{
用户在web层构造查询条件detachedCriteria,和可选的 K'DRX85F
F?3zw4Vt~
startIndex,调用业务bean的相应findByCriteria方法,返回一个 HOPi2nf{
SI~MTUqt
PaginationSupport的实例ps。 LOPw0@
:krdG%r
ps.getItems()得到已分页好的结果集 m7n8{J1O2
ps.getIndexes()得到分页索引的数组 EPn0ZwnS:M
ps.getTotalCount()得到总结果数 Ra~|;(
%d
ps.getStartIndex()当前分页索引 :'+- %xUM
ps.getNextIndex()下一页索引 :#pfv)W6t
ps.getPreviousIndex()上一页索引 [ELg:f3}5
NZaMF.
61*inGRB
PDQ\ND
920 o]Dh=t
`;\<Fr
dJYW8pcKT
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 {] Zet}2
%
a9C]?
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ymr#OP$<S
Xb'UsQ
一下代码重构了。 d8V)eZYXy~
zF-M9f$_PY
我把原本我的做法也提供出来供大家讨论吧: FKVf_Ncf%
A2xfNY<
首先,为了实现分页查询,我封装了一个Page类: 1#OM~v6B
java代码: M<KWx'uV
aplOo[
:TTZ@ q
/*Created on 2005-4-14*/ u@ psVt
package org.flyware.util.page; s${|A=
Scfk]DT
/** 6Y 4I $[
* @author Joa |."thTO
* t(sQw '>
*/ 0.4Q-?J
publicclass Page { ]
1:pnd
JPt0k
/** imply if the page has previous page */ x]X!nx6G
privateboolean hasPrePage; {r.yoI4e
9[7Gxmf
/** imply if the page has next page */ So^;5tG
privateboolean hasNextPage; lA1l
)8244;
/** the number of every page */ *^WY+DV
privateint everyPage; 017(I:V?(:
=w#sCy
/** the total page number */ uz8Y)b
privateint totalPage; 1|8<!Hx#-
no`> r}C
/** the number of current page */
}@'Zt6+tS
privateint currentPage; zK@DQ5
s+jL BY
/** the begin index of the records by the current -NgL4?p=
<:gNx%R
query */ m-h+UKt
privateint beginIndex; }X;LR\^u[f
YlP8fxS
<6(&w9WY
/** The default constructor */ .V.x0
public Page(){ nxZ[E.-\
nTd[-3o
} wFHbz9|@I
rcx'`CIJ
/** construct the page by everyPage F\"`^`(O
* @param everyPage yo=0Ov
* */ }vGWlNd#g
public Page(int everyPage){ %=t8
this.everyPage = everyPage; 4#c-?mh_
} WdvXVF
(='e9H!3D
/** The whole constructor */ ra[*E4P9L*
public Page(boolean hasPrePage, boolean hasNextPage, #rs]5tx([
b+rn:R
6_#:LFke
int everyPage, int totalPage, =iEQE
int currentPage, int beginIndex){ `r$c53|<u
this.hasPrePage = hasPrePage; sBuOKT/j
this.hasNextPage = hasNextPage; &qO#EEqG]
this.everyPage = everyPage; O 6}eV^y
this.totalPage = totalPage; 2&+Nr+P
this.currentPage = currentPage; ^o@N.+`&<
this.beginIndex = beginIndex; u#&ZD|
} =,4iMENm!
X":T>)J-
/** I6B`G Im5
* @return 0qPbmLMK
* Returns the beginIndex. 3gcDc~~=
*/ F4|Z:e,Hr
publicint getBeginIndex(){ B{^ojV;]m
return beginIndex; G7yR&x^
} m[t4XK
btV
Tt5
/** nR2pqaKc
* @param beginIndex lz-t+LD@ST
* The beginIndex to set. &0='z
*/ &LD=Zp%
publicvoid setBeginIndex(int beginIndex){ 9BA*e-[
this.beginIndex = beginIndex; [IgB78_$
} ^ rB7&96C,
2[;4D/`*
/** GqT0SP
* @return (>
{CwtH][
* Returns the currentPage. MkCq$MA
*/ erW[q
publicint getCurrentPage(){ mTsl"A>
return currentPage; X-$\DXRIo
} M~uX!bDH
0M=U>g)
/** M'"@l$[QM
* @param currentPage JO^E x1c
* The currentPage to set. y_F{C 9KE
*/ {f9jK@%Gy
publicvoid setCurrentPage(int currentPage){ E Pgn2[z
this.currentPage = currentPage; {ejJI/o0
} />EH]-|
1;Dug
/** *NEA(9
* @return Zc<fopi h
* Returns the everyPage. 0<{zW%w
*/ 7Y?=ijXXx\
publicint getEveryPage(){ wACx}'+M
return everyPage; av.L%l&d
} c@]_V
sr*3uI-)L
/** m/`"~@}&
* @param everyPage Y9K$6lz
* The everyPage to set. j=C o
*/ < SIe5"{
publicvoid setEveryPage(int everyPage){ !|1GraiS
this.everyPage = everyPage; g3`:d)|
} 4.^1D';(
D@]*{WO
/** {r$n
$
* @return " 0&+`7
* Returns the hasNextPage. X9YYUnR2
*/ yHka7D
publicboolean getHasNextPage(){ FuKp`T-H
return hasNextPage; 9~En;e
} !}TZmwf'
jYv`kt
/** 7a4b,-93
* @param hasNextPage z
TM1 e
* The hasNextPage to set. sUki|lP
*/ "/O`#Do/
publicvoid setHasNextPage(boolean hasNextPage){ h)MU^aP
this.hasNextPage = hasNextPage; ,hV}wK!
} heAbxs
te 0a6
/** _,U`Iq+X
* @return 'rX!E,59
* Returns the hasPrePage. ~`<(T)rs
*/ !='?+Ysxs
publicboolean getHasPrePage(){ S"/M+m+ ]
return hasPrePage; T"NDL[*
} {} #W~1`
+].Zs<