Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 n=~?BxB
YN^8s
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 HukHZ;5
GZo^0U,;
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 49yN|h;c!
$J+$8pA
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 mDhU wZH
?k-IS5G
。 =KMck=#B
3)sqAs(
分页支持类: <qu\q \
UqH7e c
java代码: LcXrD+
1
$%<gp@Gz
["z$rk
package com.javaeye.common.util; afjC~}
x!J L9
import java.util.List; 4)?c[aC4P
'W)x<Iey1
publicclass PaginationSupport { %rYt; 7B
mcvTz, ;=
publicfinalstaticint PAGESIZE = 30; 6%? NNEM
!eW<4jYB
privateint pageSize = PAGESIZE; D6D*RTi4
9Rpj&0Is
privateList items; m@ ~HHwj
1FuChd
privateint totalCount; CBc}N(9
p"ZPv~("V
privateint[] indexes = newint[0]; d7@ N~<n
PO#FtG
privateint startIndex = 0; ~96"^%D
ezL*YM8?@
public PaginationSupport(List items, int HH dc[pJ0D
]l4\/EW6
totalCount){ h<uQ~CQg
setPageSize(PAGESIZE); R!`#pklB
setTotalCount(totalCount); 9P]TIV.
setItems(items); ls=<c<
setStartIndex(0); 1i{B47|
} &]5<^?3
:geXplTx
public PaginationSupport(List items, int d(&vIjy
7+0hIKrFC
totalCount, int startIndex){ Z]aSo07
setPageSize(PAGESIZE); D/U o?,>8
setTotalCount(totalCount); sM4N`$Is23
setItems(items); 8<P.>u
setStartIndex(startIndex); 3B,nHU
} L\"$R":3{d
Z|)~2[Roa
public PaginationSupport(List items, int b{sFN!
q.*qZ\;K
totalCount, int pageSize, int startIndex){ \]^|IViIQ
setPageSize(pageSize); ,y^By_1wS
setTotalCount(totalCount); ]M_)f
setItems(items); Vi]D](^!
setStartIndex(startIndex); RD~QNj9,T
} sQR;!-j
]O 2_&cs
publicList getItems(){ b{(:'.
return items; Q.nEY6B_
} CnO$xE|{
xx%WIY:}
publicvoid setItems(List items){
^s%Qt
this.items = items; S_^ "$j
} 3p7*UVR"
pt=[XhxC(>
publicint getPageSize(){ H`fkds
return pageSize; :QN,T3i'/3
} \4V'NTjB
uH`ds+Hp
publicvoid setPageSize(int pageSize){ aPWFb.JO4
this.pageSize = pageSize; [QeKT8
} "5{\0CfS
}L@YLnc%
publicint getTotalCount(){ E_$ST3
return totalCount; BWd?a6nU}
} ;DGp7f#9
<F&S
publicvoid setTotalCount(int totalCount){ a"~W1|JC"
if(totalCount > 0){ rq$%
this.totalCount = totalCount; $UKDXQF"
int count = totalCount / |>VHV} 4)<
h1,J<B@
pageSize; DD;PmIW
if(totalCount % pageSize > 0) Vb/J`
count++; A=BpB}b
indexes = newint[count]; \2W( >_z
for(int i = 0; i < count; i++){ d8|:)7PSt
indexes = pageSize * wd u>3Ch"y
)U8F6GIC&}
i; |]Ockg[
} k/Cr ^J"
}else{ L[IjzxUv
this.totalCount = 0; m"u 9AOH k
} qD2<-E&M/
} K?P.1H`
(RGl, x:
publicint[] getIndexes(){ lnTl"9F
return indexes; Yh"R#
} S7-?&[oeJ
s*rtm
publicvoid setIndexes(int[] indexes){ Rb#?c+&#
this.indexes = indexes; x!S8'
} 10*U2FY)]
Rnj2Q!C2
publicint getStartIndex(){ 6Bs_"
P[
return startIndex; H3MT.Cpd
} 1w?X~VZAX
ZSxKk6n}J
publicvoid setStartIndex(int startIndex){ !iITX,'8
if(totalCount <= 0) 5PdC4vI*+
this.startIndex = 0; vVE^Y
elseif(startIndex >= totalCount) `lr\V;o!
this.startIndex = indexes Jg^tr>I~
SxMh '
[indexes.length - 1]; 3&_(D)+
elseif(startIndex < 0) g=a-zg9LX
this.startIndex = 0; OG0ro(|dI
else{ 0M pX.0
this.startIndex = indexes D7 A{*Tm
~d28"p.7
[startIndex / pageSize]; }k'8*v}8
} QD7>S(p
} uI.4zbgl[
QiY7m<3
publicint getNextIndex(){ _Tev503
int nextIndex = getStartIndex() + }K0.*+M
O=ci"2!\-
pageSize; ](^VEm}w;
if(nextIndex >= totalCount) MwXgaSV
return getStartIndex(); %$Mvq&ZZ
else M,|o 2'
return nextIndex; q18dSu
} OpYq qBf_
2uV=kq nO
publicint getPreviousIndex(){ :y0'[LV
int previousIndex = getStartIndex() - &:w{[H$-
:'#BU:
pageSize; nbhx2@Teqe
if(previousIndex < 0) n0nkv[
return0; 9v0f4Pbxm
else UI |D?z<
return previousIndex; /TS>I8V!
} 3)I v8mA
2L ~U^
} -H{c@hl
lAV6z%MmM
/9W-;l{=z
HA"LU;5>2J
抽象业务类 vBq2JJAl
java代码: L<J%IlcfO
.GLotc
{P(IA2J'S
/** v||8Q\d
* Created on 2005-7-12 QZ%_hvY[%>
*/ 5h1FvJg
package com.javaeye.common.business; #2|sS|0 <
G`gYwgU;
import java.io.Serializable; B
+_D*a
import java.util.List; u]CW5snz
SC"=M^E
import org.hibernate.Criteria; qDOx5.d
import org.hibernate.HibernateException; oQFpIX;\m
import org.hibernate.Session; no^I![_M
import org.hibernate.criterion.DetachedCriteria; 9
bGN5.5
import org.hibernate.criterion.Projections; 7S),:Uy[\
import RVX-3FvP
;w[|IRa
org.springframework.orm.hibernate3.HibernateCallback; T3Qa[>+\
import B3e{'14
.#EmE'IP*
org.springframework.orm.hibernate3.support.HibernateDaoS :8MpSvCV
6d` 6=D:
upport; 7_n@iUG2n
?zKDPBj
import com.javaeye.common.util.PaginationSupport; *}cF]8c5W
'9H]SEw
public abstract class AbstractManager extends |Ax~zk;
&\`=}hB
HibernateDaoSupport { 8x[q[
$UgM7V$
privateboolean cacheQueries = false; zd"o #(sv
;&?NuK
privateString queryCacheRegion; <wc=SMmO
?,TON5Fl-
publicvoid setCacheQueries(boolean !SKEL6~7
oF)+f4
cacheQueries){ / IAK'/
this.cacheQueries = cacheQueries; YM/^-[k3
} gey`HhZp)
@y{Whun~
publicvoid setQueryCacheRegion(String ZOyq{w!2
UvxJ _
queryCacheRegion){ I4gyGg$H
this.queryCacheRegion = YjoN:z`b
r68'DJ&m3
queryCacheRegion; teQ%t~PJ-&
} 0=yKE J
3QZw
publicvoid save(finalObject entity){ Azq,N@HO
getHibernateTemplate().save(entity); ;Rt?&&W
} )!e-5O49r
2Cj?k.Zk
publicvoid persist(finalObject entity){ dEJ>8e8
getHibernateTemplate().save(entity); %dKUB4
} ,=R->~ J
)9l5gZX'I
publicvoid update(finalObject entity){ +^{yJp.H#
getHibernateTemplate().update(entity); mdtq-v
} j ]F
Zy
/0\m;&
publicvoid delete(finalObject entity){ ] +LleS5
getHibernateTemplate().delete(entity); aB#qzrr['8
} aKhI|%5kA
WdnCRFO?l
publicObject load(finalClass entity, %7z
J}nE,U2
finalSerializable id){ uJ {N?
return getHibernateTemplate().load Pv+[N{
nkSYW]aQ1g
(entity, id); ccZ A
} t%/Y^N;
Y*dzoN.sW
publicObject get(finalClass entity, v](7c2;
d {T3
finalSerializable id){ ;sS N
return getHibernateTemplate().get YJ_LD6PL9
)CSb\
(entity, id); y8D'V)B
} +i!/J
d/j$_NQ&!
publicList findAll(finalClass entity){ ?6; +.h\
return getHibernateTemplate().find("from K#}DXq
/ ~K-0K#w
" + entity.getName()); OGzth$7A
} uy9k^4Cqa
x{6/di
publicList findByNamedQuery(finalString }2|>Y[v2j
Ir_K83VM
namedQuery){ W]4Gs;
return getHibernateTemplate r~si:?6:
#-+!t<\
().findByNamedQuery(namedQuery); %mAgE\y25
} l+*^P'0u
.u>IjK^
publicList findByNamedQuery(finalString query,
pBG(%3PpW
`s Az1/N
finalObject parameter){ [2a*TI
return getHibernateTemplate _}vD?/$L
"Rf8#\Y/<
().findByNamedQuery(query, parameter); 2fu|X#R
} |nk&ir6
AL>*Vj2h/n
publicList findByNamedQuery(finalString query, !=V>DgmW
A<C`JN}
finalObject[] parameters){ :lcZ)6&S
return getHibernateTemplate g PU|Gv5
&s>HiL>f
().findByNamedQuery(query, parameters); 1l"A7
V
} .#2YJ~
k`F$aQV9`
publicList find(finalString query){ h1^q};3!W\
return getHibernateTemplate().find ~ou*'
w@
-%I]Q9
(query); }:5AB93(
} 82WXgB>
KDhr.P.~
publicList find(finalString query, finalObject (`>RwooE
hw:zak#j,
parameter){ 559znM=
return getHibernateTemplate().find -n?}L#4%8
R%Gh4y\nF
(query, parameter); RX P 0
4
} (Eq0 |"cj
: |#Iw
public PaginationSupport findPageByCriteria
q+>J'UGb
p6$ QTx
(final DetachedCriteria detachedCriteria){ z_~5c
return findPageByCriteria UN>!#Ji:$
/%\E2+6
(detachedCriteria, PaginationSupport.PAGESIZE, 0); HF"
v
\
} a;|C51GH
7SE\(K=<%
public PaginationSupport findPageByCriteria [ Lt1OdGl
.iNPLz1
(final DetachedCriteria detachedCriteria, finalint 8zP{Cmm
'j6PL;~c
startIndex){ qsk8 #
return findPageByCriteria *y9 iuJ}
j(HC^\Hi
(detachedCriteria, PaginationSupport.PAGESIZE, (D]l/akP
QKDY:1]
startIndex); o>mZ$
} Q* ifmnB'
rj&
public PaginationSupport findPageByCriteria qOVs9'R
!([Q1r{u
(final DetachedCriteria detachedCriteria, finalint br*L|s\P\9
,R5NKWo
pageSize, "K5n |{#
finalint startIndex){ x48Y#"'
return(PaginationSupport) Fy3&Emu
|#q 5#@,
getHibernateTemplate().execute(new HibernateCallback(){ L']EYK5
publicObject doInHibernate ))^rk6
4J
Bm|Pf(
(Session session)throws HibernateException { >Ip>x!wi
Criteria criteria = Qctm"g|
L!x7]g,^
detachedCriteria.getExecutableCriteria(session); T%A45BE
V
int totalCount = 3U9]&7^
("<3w2Vlh
((Integer) criteria.setProjection(Projections.rowCount :j)H;@[I
S^?
@vj
()).uniqueResult()).intValue(); ?}\aG3_4
criteria.setProjection |q"WJQ
/bv`_>
(null); -H5n>j0!{
List items = Wu(6FQ`H
#m{K
criteria.setFirstResult(startIndex).setMaxResults :uy8$g*;TE
h4N!zj[
(pageSize).list(); o65:)z
u
PaginationSupport ps =
{Hm0 Q
u;18s-NY
new PaginationSupport(items, totalCount, pageSize, )F4H'
v_?0|Ei[
startIndex); C8>zr6)1
return ps; M/C7<?&
} Aq@_^mq1A
}, true); q[`)A?Ae
} "vQ$RW
-
0|E!e
public List findAllByCriteria(final N>!RKf:ir
I9O!CQCTt
DetachedCriteria detachedCriteria){ +O>!x#)&"
return(List) getHibernateTemplate 0l#gS;
s1.YH?A;
().execute(new HibernateCallback(){ `W,gYH7
publicObject doInHibernate 6AV@O
2mN>7Tj:
(Session session)throws HibernateException { WW82=2rJ9
Criteria criteria = zim]3%b*A;
^Lr)STh
detachedCriteria.getExecutableCriteria(session); Y+75}]B
return criteria.list(); k_?xiOSh
} xtMN<4#E
}, true); xzTTK+D@
} ,=whwl "tA
fYU/Jn#
public int getCountByCriteria(final OBaG'lrZy
k0~mK7k
DetachedCriteria detachedCriteria){ &0Yv*,4]
Integer count = (Integer) U\'.rT[#
%SuEfCM
getHibernateTemplate().execute(new HibernateCallback(){ <cm,U)j2
publicObject doInHibernate a]XQM$T$
c+chwU0W
(Session session)throws HibernateException { t &XH:w&j
Criteria criteria = o"dX3jd
w=5 D>]
detachedCriteria.getExecutableCriteria(session); ovJ#2_
return #
le<R
b-R!oP+vP
criteria.setProjection(Projections.rowCount g((glr)6M
'0)a|1,
()).uniqueResult(); fQ c%a1'
} #s'9Ydd
}, true); Wh6jr=>G
return count.intValue(); d7s? c
} WtOpxAq
} , tJ%t#
dYV'<
SQx%CcW9d
bE:oF9J?
O* `v1>
SRs1t6&y=
用户在web层构造查询条件detachedCriteria,和可选的 =c>2d.^l
VL=. JwK
startIndex,调用业务bean的相应findByCriteria方法,返回一个 ;1PnbU b
_V\rs{
5
PaginationSupport的实例ps。 #T:#!MKa
6Yhd [I3
ps.getItems()得到已分页好的结果集 )cOw9s
ps.getIndexes()得到分页索引的数组 %&m/e?@%I
ps.getTotalCount()得到总结果数 A_3V1<J`]
ps.getStartIndex()当前分页索引 1Q1NircJ
ps.getNextIndex()下一页索引 ,>% 2`Z)
ps.getPreviousIndex()上一页索引 A*#.7Np!"
1sp>UBG
j}R!'m(P'
<y#-I%ed
H0<(j(JK
|>o]+ V
Tbv", b
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 >PdYQDyVS
G q%q x4
,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 3\_ae2GW
T(t@[U2^
一下代码重构了。 kSx^Uu*
L1=+x^WQ
我把原本我的做法也提供出来供大家讨论吧: xL8r'gV@
3db ,6R
首先,为了实现分页查询,我封装了一个Page类: l_bvwo
java代码: h8@8Qw
2Zt :]be
HE
GMwRJG
/*Created on 2005-4-14*/ n,D~ whZx
package org.flyware.util.page; y'\BpP
wBz?OnD/D
/** +-tvNX%IJ
* @author Joa .^6;_s>FN
* a+A^njk
*/ !$&k@#v:
publicclass Page { K=,nX7Z5
)p*I(y
/** imply if the page has previous page */ VN!`@Ci/
privateboolean hasPrePage; S+(TRIjk
#'5|$ug[
/** imply if the page has next page */ ":s1}A
privateboolean hasNextPage; umPd+5i
Q;r9>E!
/** the number of every page */ A9Cq(L_H
privateint everyPage; rg Gm[SL*<
m(MPVY<X
/** the total page number */ $|+q9o\
privateint totalPage; Ia_I~ U$
*Ju$A
/** the number of current page */ K.3)m]dCl
privateint currentPage; %:i; eUKR
2fZVBj
/** the begin index of the records by the current e8T#ZWr*
o!:V=F
query */ >YP6/w,e
privateint beginIndex; I(LBc
h|
q!Qsnj'
w`_cmI
/** The default constructor */ K_/-mwA v
public Page(){ W/03L, 1
k?r-%oJ7
} 9G njJ
Yq~$Q4
/** construct the page by everyPage j8Nl'"
* @param everyPage `/ ]Th&(5
* */ #p'Xq
}]
public Page(int everyPage){ +ob<?
T
this.everyPage = everyPage; 9 0PF)U
} tQ!p<Q=
$)
ee7#PE]}
/** The whole constructor */ |'@c ~yc
public Page(boolean hasPrePage, boolean hasNextPage, #rZF4>c
-+vA9,pI
I+nKaN+8i
int everyPage, int totalPage, G@s]HJ:
int currentPage, int beginIndex){ j7L uN
this.hasPrePage = hasPrePage; LxD >eA
this.hasNextPage = hasNextPage; wHneVqI/U
this.everyPage = everyPage; \HR<^xY
this.totalPage = totalPage; "},0Cs
this.currentPage = currentPage; zadn`B#2
this.beginIndex = beginIndex; Md!L@gX6<
} b|
e7mis@
yGGQ;!/
/** K@uUe3
* @return tJ:]ne
* Returns the beginIndex. ey 'x3s_
*/ <cC 0l-=
publicint getBeginIndex(){ Djv0]Sm^!
return beginIndex; iWCR5c=
} ,-!h
y b 7
/** &.dC%
* @param beginIndex y3!r;>2k=
* The beginIndex to set. -nBb -y
*/ ZR|)+W;
publicvoid setBeginIndex(int beginIndex){ q. zBm@:
this.beginIndex = beginIndex; 2hZ>bg
} KDx~^OO
j_=A)B?
/** B 4s^X`?z
* @return |%wgux`z
* Returns the currentPage. &