Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 MH\dC9%p
Moza".fiN
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 H40p86@M
XK@E;Rv
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 HBXOjr<,{
xOmi\VbM
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 wJo}!{bN
w;amZgD>
。 ~HsJUro
N5
6g+,w%)
分页支持类: } (73Syl#
3;A)W18]
java代码: SO'vpz{
N<VJ(20y
y?? XIsF
package com.javaeye.common.util; x
g
vXZOy%$o
import java.util.List; ndMA-`Ny,
dkTX
publicclass PaginationSupport { &n:.k}/P
=-n}[Y}A
publicfinalstaticint PAGESIZE = 30; U!\.]jfS
[hv~o~q
privateint pageSize = PAGESIZE; eru.m+\
fr6fj
privateList items; ;[OH(!
&}B|"s[
privateint totalCount; [ sjosV
4!no~ $b
privateint[] indexes = newint[0]; Q/0Tj]D
7;wd(8
privateint startIndex = 0; . 3T3EX|G
( ^Nz9{
public PaginationSupport(List items, int 5<Nx^D
=m#?neop
totalCount){ Dp-z[]})1
setPageSize(PAGESIZE); ]Q)OL
setTotalCount(totalCount); +VOK%8,p
setItems(items); BUXpCxQ
setStartIndex(0); c 3)jccWTc
} M%P:n/j
)1`0PJoHE
public PaginationSupport(List items, int w_K1]<Q*
.p"
xVfi6
totalCount, int startIndex){ $DaNbLV
setPageSize(PAGESIZE); r52gn(,
setTotalCount(totalCount); 6mxfLlZ
setItems(items); 00~mOK;1
setStartIndex(startIndex); ~V1E0qdAE
} I:1C8*/
`7V]y-
public PaginationSupport(List items, int 56kI
5:
!wh8'X*
totalCount, int pageSize, int startIndex){ =MDysb&:
setPageSize(pageSize); ],Do6
@M-
setTotalCount(totalCount); P{lB50
setItems(items); sWnLEw
setStartIndex(startIndex); G3AesTT|
} v;D~Pa
YO}<Ytx
publicList getItems(){ =$JET<(
return items; s
R/F"
} ')<hON44EX
_
*Pf
publicvoid setItems(List items){ 7n<::k\lb
this.items = items; r0% D58
} *#+An<iT ;
z[qDkL
publicint getPageSize(){ |#R7wnE[k~
return pageSize; ^9:Z7 >Z
} 59;KQ
pB0 \\wR
publicvoid setPageSize(int pageSize){ ^WWQI+pk
this.pageSize = pageSize; &7tbI5na@
} vy:Z /1q
&E5g3lf
publicint getTotalCount(){ >7DhTM-A
return totalCount; }9}h*RWm
} 4zFW-yy
@?]RBX?a
publicvoid setTotalCount(int totalCount){ 5#E`=C%
if(totalCount > 0){ &`2)V;t
this.totalCount = totalCount; 8$Y9ORs4
int count = totalCount / $X,D(
(V2fRv
pageSize; f
x+/C8GK
if(totalCount % pageSize > 0) iSs:oH3l
count++; ~q25Yx9W@
indexes = newint[count]; 1\I}2;
for(int i = 0; i < count; i++){ q9s=~d7
indexes = pageSize * Jij*x>K>y
4ID5q~
i; 6?c7$Y
} NU2;X (z[
}else{ )MTOU47U
this.totalCount = 0; #Ki[$bS~6
} &\*(Q*2N
} d5:c^`
j*r{2f4Rt
publicint[] getIndexes(){ !'*-$e
return indexes; c(s.5p ^
} i?^L/b`H
T{[=oH+
publicvoid setIndexes(int[] indexes){ j/?kL{B
this.indexes = indexes; X$W~mQma6
} fVpMx4&F
u;2[AQ.
publicint getStartIndex(){ GC}==^1
return startIndex; Wdbed U~`Q
} Qh\60f>0
a<bwzX|.
publicvoid setStartIndex(int startIndex){ T1=fNF
if(totalCount <= 0) d>qY{Fdz
this.startIndex = 0; 'm
kLCS
elseif(startIndex >= totalCount) &&>ekG9@
this.startIndex = indexes /h|#J
Wg]Qlw`\|
[indexes.length - 1]; 9CD_os\h
elseif(startIndex < 0) H$UcF1k<
this.startIndex = 0; ~2-1 j
else{ *VT/
this.startIndex = indexes 1/J=uH
9~[Y-cpoi
[startIndex / pageSize]; F0@gSurg)
} k\?Ii<m
} A^<jy=F&
Oxd]y1
publicint getNextIndex(){ 2g! +<YZ~
int nextIndex = getStartIndex() + -6B4sZpzD
h(EhkCf
pageSize; %._.~V
if(nextIndex >= totalCount) H"WprHe
return getStartIndex(); c9h6C
else Wvf
^N(
return nextIndex; c\AfaK^KF
} 0flRh)[J
[ v*ju!
publicint getPreviousIndex(){ 1yu4emye4
int previousIndex = getStartIndex() - [` 7ThHX
20Wg=p9L
pageSize; cyz3,3\e
if(previousIndex < 0) r*Ca}Z
return0; +QJ#2~pE
else eehb1L2(b
return previousIndex; 5$C-9
} 11;MN
+52{-a,>
} ?$4 PVI}
9 djk[ttA)
-(H0>Ap
%1+4_g9
抽象业务类 TOQP'/
java代码: c{w2Gt!
qlPT Ll
0LJv'
/** FU4L6n
* Created on 2005-7-12 f) L
*/ )lDD\J7
package com.javaeye.common.business; IjnU?Bf
aQ@oH#
import java.io.Serializable;
92oFlEJ
import java.util.List; 8KzkB;=n
lrIe"H@
import org.hibernate.Criteria; L.JT[zOfb
import org.hibernate.HibernateException; b4N[)%@
import org.hibernate.Session; 7B66]3v
import org.hibernate.criterion.DetachedCriteria; #o#H?Vo9b
import org.hibernate.criterion.Projections; a9V,es"BWQ
import R0*|Lo$6
X#^[<5
org.springframework.orm.hibernate3.HibernateCallback; Slc\&Eb
import om:VFs\U
}Jj}%XxKs
org.springframework.orm.hibernate3.support.HibernateDaoS nAlQ7'
K[zVa
upport; |+D!=
:x
KoT%Mfu
import com.javaeye.common.util.PaginationSupport; FfT`;j
.8JTe0
public abstract class AbstractManager extends 88$8d>-
f]srRYSR
HibernateDaoSupport { c@L< Z` u
U| R_OLWAg
privateboolean cacheQueries = false; H0vfUF53l
8Z=R)asGS
privateString queryCacheRegion; l+0oS'`V*L
BnF^u5kv %
publicvoid setCacheQueries(boolean I{=Qtnlb
Nu)NqFG,
cacheQueries){ =Nr-iae#
this.cacheQueries = cacheQueries; g*+>H1}
} [v!f<zSQK
_7_Y={4=`
publicvoid setQueryCacheRegion(String 19%imf
\1M4Dl5!
queryCacheRegion){ 0?|<I{z2
this.queryCacheRegion = NL+N%2XG7
}W^A*]X
queryCacheRegion; ('+d.F[109
} F#5~M<`.o
5'u<iSmBo
publicvoid save(finalObject entity){ R[]Mdt<
getHibernateTemplate().save(entity); EQSQFRk;
} 2&J)dtqz
5146kp|1
publicvoid persist(finalObject entity){ mgU<htMr1
getHibernateTemplate().save(entity); 5L}/&^E#p
} ]JQULE)
m+z&Q
publicvoid update(finalObject entity){ =~LJ3sIX
getHibernateTemplate().update(entity); Z*6IW7#
} 4 s9LB
t\O16O7S
publicvoid delete(finalObject entity){ N!tX<u~2
getHibernateTemplate().delete(entity); .O<obq~;C
} -jmY)(\
C\hM =%
publicObject load(finalClass entity, o.`5D%}i
B&"Q\'c
finalSerializable id){ -MBxl`JU
return getHibernateTemplate().load _Y m2/3!
y$M%2mh`
(entity, id); =:U`k0rn!
} +:/%3}`
:7;@ZEe
publicObject get(finalClass entity, as=fCuJ
%^6F_F_jS
finalSerializable id){ {?7Uj
return getHibernateTemplate().get YtLt*Ig%
+&H4m=D-#a
(entity, id); ?:9"X$XR
} 1X1dG#:
*|HY>U.
publicList findAll(finalClass entity){ eS){1
return getHibernateTemplate().find("from
C9)@jK%
*lJxH8 \
" + entity.getName()); J]r^W)O
} bpa?C
u:
publicList findByNamedQuery(finalString 'dc#F3
|;{6&S
namedQuery){ 7_[L o4_
return getHibernateTemplate -$Ih@2"6
tfWS)y7
().findByNamedQuery(namedQuery); %\:Wi#w>
} dqcL]e
MLp9y#
publicList findByNamedQuery(finalString query, %!#azI
]hV*r@d
finalObject parameter){ &BSn?
return getHibernateTemplate :b!s2n!u
X"*5+* z]
().findByNamedQuery(query, parameter); AbOf6%Env
} M
D#jj3y
AQ^u
publicList findByNamedQuery(finalString query, 0b 54fD=
#T"4RrR
finalObject[] parameters){ :Llb< MY2
return getHibernateTemplate )Q JUUn#
V|R,!UND
().findByNamedQuery(query, parameters); (^>J&[=
} B`sAk
%
?gXp*>Kg[
publicList find(finalString query){ a,o*=r
return getHibernateTemplate().find X5w$4Kj&4l
:rP=t ,
(query); asqV~n
} iU:cW=W|M\
!bP@n
publicList find(finalString query, finalObject
{K!)Ss
V28M lP
parameter){ yIE!j%u
return getHibernateTemplate().find z0Z%m@
7-V/RChBm
(query, parameter); !p/goqT~dY
} Ew$C
;&9
!ubD/KE
public PaginationSupport findPageByCriteria NCD04U5y
dgP3@`YS
(final DetachedCriteria detachedCriteria){ #p{4^
return findPageByCriteria c[s4EUG
(w zQ2Dk
(detachedCriteria, PaginationSupport.PAGESIZE, 0); $Ygue5{c
} *OQ2ucC8j
- !
S_ryL
public PaginationSupport findPageByCriteria ^kSqsT"
0IWf!Sk
]
(final DetachedCriteria detachedCriteria, finalint BL4-7
_WbxH
startIndex){ h>bx}$q
return findPageByCriteria 4b`=>X;W
O.JN ENZf
(detachedCriteria, PaginationSupport.PAGESIZE, 8l">cVo]T
:fJN->wY^s
startIndex); /Gfw8g\}
} q0\6F^;M
Zgb!E]V[
public PaginationSupport findPageByCriteria /<BI46B\
*n"{J(Jt`
(final DetachedCriteria detachedCriteria, finalint 8JUwf
4`=mu}Y2
pageSize, `qwBn=
finalint startIndex){ +W+|%qM,\
return(PaginationSupport) D3K8F@d
<\S:'g"(
getHibernateTemplate().execute(new HibernateCallback(){
W!(LF7_!
publicObject doInHibernate k|f4Cf,
%N_%JK\{@
(Session session)throws HibernateException { {f p[BF
Criteria criteria = ^dxTm1Z
Wn}'bqp
detachedCriteria.getExecutableCriteria(session); xe$_aBU
int totalCount = ,"0:3+(8;
EB|}fz
((Integer) criteria.setProjection(Projections.rowCount S5EK~#-L[
?Ss!e$jf
()).uniqueResult()).intValue(); ]J]h#ZHx
criteria.setProjection PmM3]xVzd
2b8L\$1q
(null); Jfl!#UAD|n
List items = +qdEq_m
3T0"" !Q
criteria.setFirstResult(startIndex).setMaxResults @=f\<"$vt
3irl
(;v
(pageSize).list(); '/%H3A#L
PaginationSupport ps = {+ b7sA3
k~z Iy;AZ
new PaginationSupport(items, totalCount, pageSize, g#E-pdY
pI<f) r
startIndex); l}M!8:UzU
return ps; o[D9I
hs
} Srd4))2/0
}, true); dUdT7ixo
} 5Jnlz@P9
E&:,oG2M
public List findAllByCriteria(final Yz)qcU
J<lO=
+mg
DetachedCriteria detachedCriteria){ oe~b}:
return(List) getHibernateTemplate f(7GX3?
~flV`wy$$1
().execute(new HibernateCallback(){ +[g,B1jt
publicObject doInHibernate sW8dPw
O
"tpSg
(Session session)throws HibernateException { `5Zz5V
Criteria criteria = T^]}Oy@e,J
Z;)%%V%o
detachedCriteria.getExecutableCriteria(session); B4 }bVjs
return criteria.list(); hehFEyx
} ^T-V^^#(
}, true); R0-j5&^jju
} lU8Hd|@-
K!l5coM
public int getCountByCriteria(final a7%]Y}$
|]*/R^1>2
DetachedCriteria detachedCriteria){ P=G3:eX
Integer count = (Integer) uWE^hz"
lks!w/yCF
getHibernateTemplate().execute(new HibernateCallback(){ 63 B?.
publicObject doInHibernate A&jlizN7
E8&TO~"a]e
(Session session)throws HibernateException { q'MZ R'<@
Criteria criteria = ;gr9/Vl
IIx#2r
detachedCriteria.getExecutableCriteria(session); uY'HT|@:{
return ^K@C"j?M/
` sU/& P
criteria.setProjection(Projections.rowCount H}
g{Cr"Ex
@Do= k
()).uniqueResult(); ;sFF+^~L
} VVOd]2{
}, true); 3sZ\0P}
return count.intValue(); ,s;UfF
} .#pU=v#/[
} UW
EV^ &"x
Thit
v|2T%y_
u
N ZSSg2TX#
UFuX@Lu0
.kfIi^z
用户在web层构造查询条件detachedCriteria,和可选的 &@YmA1Yu)E
3?
+Hd
startIndex,调用业务bean的相应findByCriteria方法,返回一个 {Y9q[D'g .
'2^Q1{ :\
PaginationSupport的实例ps。 6)Lk-D
i
K? w6
ps.getItems()得到已分页好的结果集 H7:] ]j1
ps.getIndexes()得到分页索引的数组 N] sAji*
ps.getTotalCount()得到总结果数 I,8Er2;)
ps.getStartIndex()当前分页索引 C;urBsC
ps.getNextIndex()下一页索引 uGlUc<B\*
ps.getPreviousIndex()上一页索引 3m)y|$R
um0N)&iY
P";'jVcR
83q6Sv
^y%T~dLkp'
V "h
+L7T
@;RXLq/8
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 u.Dz~$T
CeC6hGR5
,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 ~/P[J
D,FkB"ZZE
一下代码重构了。 BThrO d
?5
7Sk+
我把原本我的做法也提供出来供大家讨论吧: o`*,|Nsq
D}X\Ca"h
首先,为了实现分页查询,我封装了一个Page类: "#\;H$+
java代码: w+CA1q<
lU8`F(Mn
/I0%Z+`=
/*Created on 2005-4-14*/ 3:i@II
package org.flyware.util.page; :20W\P<O!A
CizX<Cr}
/** B&uz;L3
* @author Joa k\GcHI-
* RrQJ/ts7}
*/ )P|),S,;Z
publicclass Page { "LTad`]<Ro
s!7y
/** imply if the page has previous page */ BR yl4
privateboolean hasPrePage; }U"&8%PZr
W:L
AP
R
/** imply if the page has next page */ WI-1)1t
privateboolean hasNextPage; ?<'}r7D
#4 pB@_
/** the number of every page */ hQDXlFHT
privateint everyPage; r\V
={p
U\*J9
/** the total page number */ AkQ~k0i}b
privateint totalPage; !d0kV,F:
Y`SvMkP)+
/** the number of current page */ D!IY&H,wo
privateint currentPage; _"rgET`vW
Z>5b;8
/** the begin index of the records by the current ;hN!s`vq
nc|p )
query */ 5"O.,H}
privateint beginIndex; kL"2=7m;
'$%l7
,1o FPa{?
/** The default constructor */ @r/nF5
public Page(){ + @s"zp;F
O[JL+g4
} ZX./P0
`&c kZiq
/** construct the page by everyPage %/ #NK1&M
* @param everyPage {[?(9u7R
* */ 1NA.nw.
public Page(int everyPage){ ^ sLdAC
this.everyPage = everyPage; Cd}<a?m,
} VQ9/Gxdeo
\n|EM@=eE
/** The whole constructor */ nk's_a*Z
public Page(boolean hasPrePage, boolean hasNextPage, sN01rtB(UT
6zuTQ^pz
fHd#u%63K
int everyPage, int totalPage, $C$V%5aA
int currentPage, int beginIndex){ [j/9neaye
this.hasPrePage = hasPrePage; N~zdWnSZ@G
this.hasNextPage = hasNextPage; #fn)k1
this.everyPage = everyPage; 6fEqqUeV
this.totalPage = totalPage; @O^6&\s>
this.currentPage = currentPage; dE{dZ#Jfi
this.beginIndex = beginIndex; ]Ntmy;Q
} jkF^-Up.
\\B(r
/** 7}5JDG
* @return Tqn@P
* Returns the beginIndex. 30T)!y
*/ O.M>+~Nw
publicint getBeginIndex(){ ,uhb~N<
return beginIndex; EaY?aAuS:
} ra
g Xn
O`t&ldU
/** fdi\hg^x
* @param beginIndex ,w:U#r~s"
* The beginIndex to set. `Cynj+PCe
*/ $1L>)S
publicvoid setBeginIndex(int beginIndex){ rlSeu5X6
this.beginIndex = beginIndex; Vd+T$uC
} C{xaENp
^EQ<SCh
/** a![{M<Y~
* @return IDriGZZ<)6
* Returns the currentPage. h_,i&d@(
*/ xHLlMn4M
publicint getCurrentPage(){ r1{@Ucw2
return currentPage; ">,|V-H
} ag;pN*z
oDA XiY$u
/** g(7rTyp4)
* @param currentPage ?ri?GmI|
* The currentPage to set. 9Uekvs=r=M
*/ ZdWm:(nkU
publicvoid setCurrentPage(int currentPage){ ~t~k2^)|"
this.currentPage = currentPage; Q1I6$8:7
} W/bQd)Jvk
Ee%%d
/** Q6!zZ))~
* @return sfugY(m
* Returns the everyPage. aa/(N7
*/ $AjHbU.I{
publicint getEveryPage(){ Ed df2;-.
return everyPage; ?(F6#"/E
} ,pQZ@I\z
;)z:fToh
/** bSi%2Onj
* @param everyPage VSI9U3t3w
* The everyPage to set. Q%f^)HZGR
*/ nuMD!qu!nZ
publicvoid setEveryPage(int everyPage){ g63(E,;;J
this.everyPage = everyPage; /cQueUME`
} _P 3G
PQSP&
/** jTtu0Q|
* @return .*S#aq4S
* Returns the hasNextPage. b;W3j
*/ _Gi4A
publicboolean getHasNextPage(){ oC: {aK6\
return hasNextPage; G+"t/?/
} li'YDtMKCY
:B5Fdp3
/** RVA(Q[ ;
* @param hasNextPage Val|n*%
* The hasNextPage to set. :W.(S6O(
*/ p\tm:QWD;
publicvoid setHasNextPage(boolean hasNextPage){ kY|utoAP
this.hasNextPage = hasNextPage; H.|#c^I
} (Ag16
U}e!Wjrc
/** S.94edQ
* @return K6/Q}W
* Returns the hasPrePage. p6]1w]*R
*/ 4I
k{
publicboolean getHasPrePage(){ )@l%
return hasPrePage; BB!THj69a6
} Fg5kX
0$)>D==
/** 6azGhxh
* @param hasPrePage 2Aazy'/
* The hasPrePage to set. $=8
NED5
*/ %G_B^p4
publicvoid setHasPrePage(boolean hasPrePage){ nn:.nU|I
this.hasPrePage = hasPrePage; [P=Jw:E
} ~hnQUS`A
ll<Xz((o
/** oim9<_
* @return Returns the totalPage. t?x<g <PJ4
* wOEj)fp.
*/ r6MMCJ|G
publicint getTotalPage(){ ;4^Rx
return totalPage; Yz/md1T$
} 5j<mbt}
:uq\+(9
/** mzaWST]
* @param totalPage vv3*
j&I
* The totalPage to set. &0OG*}gi
*/ a LroD$#
publicvoid setTotalPage(int totalPage){ mPtZO*Fc
this.totalPage = totalPage; EyD=q! ZVZ
} LqoB 10Kc\
Utj&]RELK
} hl7bzKO*w
@uqd.Q
nJG U-Z
b8`)y<