Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 wJ+"JQY.J+
hMi[MB7~
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 XO\P4x:c
-[ F<u
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 0Ebs-kP
0e3aWn
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 OrHnz981K
Nk]r2^.z[
。 c>I^SY(r%
P E.^!j
分页支持类: X1$0'usS
cp[k[7XGD
java代码: 1J^{h5?lU
]_j{b)t
=`g+3
O;<
package com.javaeye.common.util; is`le}$^y
AOeptv^k3}
import java.util.List; >`u} G1T\
YwEXTy>0
publicclass PaginationSupport { ?/NxZ\
O7:JG[tR*
publicfinalstaticint PAGESIZE = 30; v2dC na\
@TsOc0?-
privateint pageSize = PAGESIZE; y~;Kf0~
OZ0q6"
privateList items; Vhv<w
O Ct
p ^T0(\1
privateint totalCount; 1[/X$DyaK
l3-;z)SgH
privateint[] indexes = newint[0]; A{Pp`*l
D@&0 P&
privateint startIndex = 0; +.5 /4?
:jgwp~l
public PaginationSupport(List items, int u9QvcD^'z
Bxak[>/
totalCount){ T+RfMEdr
setPageSize(PAGESIZE); b4i=eI8
setTotalCount(totalCount); r`VKb
setItems(items); W8R@Pf
setStartIndex(0); h9RG?r1
} EnZrnoGM
\Ua"gS2L
public PaginationSupport(List items, int -@e9!/GP,
5
J61PuH
totalCount, int startIndex){ UVA|(:
setPageSize(PAGESIZE); o%5^dX&[
setTotalCount(totalCount); jv?`9{-
setItems(items); gVl%:Ra%
setStartIndex(startIndex); P$4G2>D8dg
} H5{d;L1[
O\=3{
public PaginationSupport(List items, int T[;O K
Gr}Lp
totalCount, int pageSize, int startIndex){ +t})tDPXw
setPageSize(pageSize); >y
&9!G
setTotalCount(totalCount); E_MGejm@
setItems(items); Y }aa6
setStartIndex(startIndex); [0w@0?[
} he;&KzEu
/T!S)FD\/v
publicList getItems(){ m
=
"N4!
return items; %70sS].@
} D}r,t_]Eb
,GA2K .:#
publicvoid setItems(List items){ XL1v&'HLV
this.items = items; Yw vXSA
} wWQv]c%
S9U,so?
publicint getPageSize(){ .'saUcVg:
return pageSize; CfNHv-jDL
} d;daYjOm
4#{i
publicvoid setPageSize(int pageSize){ ML^c-xY(
this.pageSize = pageSize; :
2Ho
} $z)r(N$
al.~[T-O+
publicint getTotalCount(){ 3.Oc8(N^}
return totalCount; $*tq$DZ4&
} Es/\/vF7]D
lU`]yL
publicvoid setTotalCount(int totalCount){ rhGHR5
g
if(totalCount > 0){ 7y1J69IK
this.totalCount = totalCount; >
SU2Jw
int count = totalCount / gBA
UrY%]
bwR24>8lP
pageSize; o$8v8="p
if(totalCount % pageSize > 0) 4W
&HUQ?^
count++; D G}} S5
indexes = newint[count]; ( 6|S42
for(int i = 0; i < count; i++){ 0'{0kE[wn
indexes = pageSize * QqA~y$'ut
wuSp+?{5k
i; 7{e0^V,\k
} hqd}L~o:
}else{ Hr |De8#f
this.totalCount = 0; Av:5v3%
} &=oW=g 2
} eLXG _Qb"
/ldE (!^n
publicint[] getIndexes(){ 0wU8PZ Nj
return indexes; #Cks&[!c
} xL,Lb}){%
Bvj-LT=)
publicvoid setIndexes(int[] indexes){ L
s6P<"V
this.indexes = indexes; n8n(<
} tkx1iBW=
P$?3\`U;
publicint getStartIndex(){ Bt[OGa(q
return startIndex; _-$O6eZ
} MQ>.^]B]o
l=G=J( G
publicvoid setStartIndex(int startIndex){ UE33e(Q<
if(totalCount <= 0) I?nj_ as
this.startIndex = 0; m_{OCHS+
elseif(startIndex >= totalCount) GP6-5Y"8
this.startIndex = indexes zY6{ OP!#
a"uO0LOb
[indexes.length - 1]; <8nl}^d5
elseif(startIndex < 0) VDq4n;p1
this.startIndex = 0; 6UOV,`:m+
else{ t>p!qKrE'J
this.startIndex = indexes H)tnxD0)
Z".mEF-b
[startIndex / pageSize]; 8@S7_x
} 0O+[z9
} ,&[2z!
$Ay
j4|_-
publicint getNextIndex(){ SZW+<X
int nextIndex = getStartIndex() + $xqI3UaX
R?@F%J;tx
pageSize; lIPy)25~
if(nextIndex >= totalCount) a'=C/ s+
return getStartIndex(); Blv!%es
else tr3Rn :0]
return nextIndex; Bwv@D4bii
} |d}f\a`
+NL^/y<;
publicint getPreviousIndex(){ a-w=LpVM
int previousIndex = getStartIndex() - /Qi;'h]
aN9#ATE
pageSize; "'/:Tp)
if(previousIndex < 0) <8#Q5
return0; .1R:YNx{/
else 2K?~)q&t*
return previousIndex; mv9k_7<
} Fr/3Qp@S
_hT-5)1r
} vpR^G`/
h#a;(F4_7
xE%1C6~C<
vowU+Y
抽象业务类 \z"0lAv"
java代码: {.c(Sw}Eo
U(#)[S,
GCSR)i|
/** t<S]YA~N'
* Created on 2005-7-12 >'IFr9&3
*/ ANB@cK_
package com.javaeye.common.business; i
oCoFj
nd)Z0%xo
import java.io.Serializable; ($a ?zJr
import java.util.List; jSa9UD
0].x8{~o
import org.hibernate.Criteria; p0Cp\.
import org.hibernate.HibernateException; 0 5eth
import org.hibernate.Session; BxR%\
import org.hibernate.criterion.DetachedCriteria; vd>K=!
J
import org.hibernate.criterion.Projections; n#@/A
import Kjbt1n
m# #( uSh
org.springframework.orm.hibernate3.HibernateCallback; =@%;6`AVcp
import E({+2}=1
W_k;jy_{9
org.springframework.orm.hibernate3.support.HibernateDaoS C9l5zb~D
::13$g=T9s
upport; 1 o<l;:
,#=ykg*~/
import com.javaeye.common.util.PaginationSupport; d&S4`\g?8
^`b&fbv
public abstract class AbstractManager extends xs<~[l
[e1kfw
HibernateDaoSupport { FO"8B
%7tQam
privateboolean cacheQueries = false; 8#% Sq=/+M
>~O36q^w
privateString queryCacheRegion; RQ?T~ASs
3w&fN3
1
publicvoid setCacheQueries(boolean =+um:*a.
LxqK@Q<B
cacheQueries){ 9o-fI@9
this.cacheQueries = cacheQueries; t;BvKH77
} 'qD5
w k1O*_76
publicvoid setQueryCacheRegion(String Fv!zS.)`
$HjKELoJ<
queryCacheRegion){ M%=V vE.I
this.queryCacheRegion = U?/UW;k[
+uR|0Jo8X
queryCacheRegion; En@] xvE
} <^:e)W
c&zZsJ"~
publicvoid save(finalObject entity){ 7%rSo^t,L
getHibernateTemplate().save(entity); f.f5f%lO~
} jO'+r'2B9
iUuG}rqj
publicvoid persist(finalObject entity){ npcB+6
getHibernateTemplate().save(entity); JQVu&S
} KX*Hev'K
** \B P,]}
publicvoid update(finalObject entity){ -VK6Fq
getHibernateTemplate().update(entity); l!2hwRR
} z-(#Mlq:!
c*nH=
publicvoid delete(finalObject entity){ BoZG^
getHibernateTemplate().delete(entity); "BB#[@
} wk {9
r,p6J7/lfS
publicObject load(finalClass entity, gcImk0NIY
xl5n(~g)p
finalSerializable id){ {"33 .^=
return getHibernateTemplate().load 1](5wK-Z
Y.$InQ gL
(entity, id); ,#^<0u+zrF
} UN`F|~@v
.K![<eZ
publicObject get(finalClass entity, p'afCX@J
(]'Q!MjGa
finalSerializable id){ j7;v'eA`;7
return getHibernateTemplate().get MFHPh8P
YxMOr\B
(entity, id); mT57NP
} y<YVb@O.
HgG-r&r!2
publicList findAll(finalClass entity){ i<D}"h|
return getHibernateTemplate().find("from QZufQRfr{
O[RmQ8ll
" + entity.getName()); 7I;Give{
} Hfer\+RX
Wpom {-
publicList findByNamedQuery(finalString 7^k`:Z
{ .KCK_ d
namedQuery){ o{*8l#x8
return getHibernateTemplate S=O/W(ZB
&]~z-0`$!
().findByNamedQuery(namedQuery); y:!MWZ
} IY|;}mIF
?WWnt^
publicList findByNamedQuery(finalString query, RMB?H)p+
&fYx0JT
finalObject parameter){ bAeN>~WvY
return getHibernateTemplate _I_Sq,Z#
Auhw(b>}TW
().findByNamedQuery(query, parameter); }~lF Rf
} kr7f<;rmJ
hCO*gtA)M
publicList findByNamedQuery(finalString query, g~d}?B\<@
JH2?^h|{
finalObject[] parameters){ e,Xvt5
return getHibernateTemplate {+f@7^/i.
_<5 o1
().findByNamedQuery(query, parameters); (]0$^!YK
} ^DHFP-G?e
9bjjo;A
publicList find(finalString query){ JJ56d)37.
return getHibernateTemplate().find BQf}S
+
)rD] y2^<
(query); CogLo&.
} ,_`\c7@
I/9ZUxQCyG
publicList find(finalString query, finalObject 1?HUXN#,
u;DF$
parameter){ iR4CY-
return getHibernateTemplate().find xMtl<Na
P*/p x4;6
(query, parameter); !-r@_tn|
} '6{q;Bxo
D_O%[u}
public PaginationSupport findPageByCriteria ld94ek
n6WSTh
(final DetachedCriteria detachedCriteria){ AW6]S*rh
return findPageByCriteria ^BjwPh4Z#
-$;H_B+.
(detachedCriteria, PaginationSupport.PAGESIZE, 0); J{$C}8V
}
N`y!Km
D`e!CprF
public PaginationSupport findPageByCriteria r4NI(\gU
uf`o\wqU
(final DetachedCriteria detachedCriteria, finalint uW4G!Kw28
mT@UQCG
startIndex){ !'ajpK
return findPageByCriteria 1*?IDYB
yVQqz
(detachedCriteria, PaginationSupport.PAGESIZE, Y,WcHE
]*}*zXN/E
startIndex); EBw}/y{Kt
} 1SkGG0
W
*ok89ad
public PaginationSupport findPageByCriteria j]J2,J
PK3)M'[
(final DetachedCriteria detachedCriteria, finalint 6luCi$bL
u 8U>R=M
pageSize, qChS} Q
finalint startIndex){ A3&8@/6,
return(PaginationSupport) #x#.@
n5UcivyX
getHibernateTemplate().execute(new HibernateCallback(){ A`#v-
publicObject doInHibernate yhQo1e>
wias]u|
(Session session)throws HibernateException { Q(AOKp,F
Criteria criteria = xQ1&j,R]
RNoS7[&
detachedCriteria.getExecutableCriteria(session); AyNl,Xyc4
int totalCount = {FQ
dDIj#
3`#sXt9C
((Integer) criteria.setProjection(Projections.rowCount \R&`bAd k
3X0^xUA6
()).uniqueResult()).intValue(); -K}@Gp
criteria.setProjection ,Q(n(m'
}K"=sE
(null); zfi{SO
l
List items = 4s`*o/it
y+Q!4A
criteria.setFirstResult(startIndex).setMaxResults 8 gOK?>'9
XFYCPET
(pageSize).list(); ,n &|+&
PaginationSupport ps = ; {I{X}b
.d8) *
new PaginationSupport(items, totalCount, pageSize, bL
*; N3#E
IIop"6Ko
startIndex); Gpe h#Q4x
return ps; '.WYs!
} f(D?g
}, true); ?_\Hv@t;
} _PNU*E%s<
hpWAQ#%oHm
public List findAllByCriteria(final xZ`t~4qR
x"AYt:ewuc
DetachedCriteria detachedCriteria){ Fhxg^
return(List) getHibernateTemplate S)g5Tu)
_z,/!>J
().execute(new HibernateCallback(){ -Rjn<bTIy
publicObject doInHibernate jGI!}4_
s_`wLQ7e
(Session session)throws HibernateException { MB^b)\X
Criteria criteria = =5dv38
c~RElL
detachedCriteria.getExecutableCriteria(session); BAoqO
Xv
return criteria.list(); Dvd.Q/f
} RG*Nw6A
}, true); Ku,Efr
} [`ttNW(_
:Oq!.uO
public int getCountByCriteria(final |r0j>F
pVbX#3
DetachedCriteria detachedCriteria){ 1+#Vj#
Integer count = (Integer) *%Gy-5hM
kf "cd1
getHibernateTemplate().execute(new HibernateCallback(){ ml?+JbLg0
publicObject doInHibernate rK=[&k
\8Blq5n-O*
(Session session)throws HibernateException { +#&2*nY
Criteria criteria = d9Rj-e1x
HLk}E*.mC
detachedCriteria.getExecutableCriteria(session); u=rY
return ZP%^.wxC
9SAyU%mS:
criteria.setProjection(Projections.rowCount q%>L/KJ#
lZn <v'y
()).uniqueResult(); krz@1[w-j
} CUxSmN2[
}, true); n4Q!lJ
return count.intValue(); !xe<@$
} #exE~@fy-
} i"w$D{N
%gw0^^A
|dX#4Mq^,
aK1|b=gVj
!(SaE'
9^
mrsj
用户在web层构造查询条件detachedCriteria,和可选的 P?TFX.p7
lfj>]om$
startIndex,调用业务bean的相应findByCriteria方法,返回一个 ;Rwr5
hrcR"OZ~X
PaginationSupport的实例ps。 i$og
v2J
.`)ICX
ps.getItems()得到已分页好的结果集 u1]5qtg"
ps.getIndexes()得到分页索引的数组 (5G^"Srw
ps.getTotalCount()得到总结果数 pOH_ CXw
ps.getStartIndex()当前分页索引 zyCl`r[}
ps.getNextIndex()下一页索引 :_Ng`b/
ps.getPreviousIndex()上一页索引 _|6{(
aNXu"US+Sp
1L &_3}
U8<GD|
ND21;
7J>n;8{%?
m! p'nP
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 G3?8GTH
2!" N9Adt
,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 X0U{9zP
v5<Ext
rV
一下代码重构了。 y@_4OkR@
t5eux&C
我把原本我的做法也提供出来供大家讨论吧: F*I{?NRN1
~9'VP}\
首先,为了实现分页查询,我封装了一个Page类: C@Wm+E~;8
java代码: sKHUf1
<cepRjDn
!vett4C* K
/*Created on 2005-4-14*/ vQIoj31
package org.flyware.util.page; 'MG)noN5
\:"s*-
/** .6.oqb
* @author Joa @~a52'\
* J@yy2AZnO
*/ ?}lCS7&
publicclass Page { &:{|nDT_2
TH6g:YP`7
/** imply if the page has previous page */ gQ/zk3?k
privateboolean hasPrePage; YQYN.\
2@^8{
/** imply if the page has next page */ tk,
HvE
privateboolean hasNextPage; KWN&nP
+
-JUv'fk
/** the number of every page */ r}vI#;&
privateint everyPage; 0n3O;=[aV
!_V*VD
/** the total page number */ B>~E6j7[Mp
privateint totalPage; <y`yKXzBUV
XPX{c|]>.
/** the number of current page */ JQbI^ef_;
privateint currentPage; B VPf8!-
e#W@ep|n
/** the begin index of the records by the current ,P9B8oIq
LW,!B.`@
query */ t/q\Ne\\,
privateint beginIndex; x28Bz*O
Iem* 'r
?f &*mp
/** The default constructor */ &|9?B!,`
public Page(){ $'[(
DwLS
rU'&o) a^
} y)(@
AY *
/** construct the page by everyPage Z"E+ TX
* @param everyPage TJO|{Lxm
* */ LU%g>?m.]
public Page(int everyPage){ xp,H5
m%
this.everyPage = everyPage; ^{Mx?]z
} VSP[G ,J.
uswz@
[pa
/** The whole constructor */ iOD9lR`s
public Page(boolean hasPrePage, boolean hasNextPage, R?]>8o,
:!aFfb["
(1TYJ. Z
int everyPage, int totalPage, A
7TP1
int currentPage, int beginIndex){ dn`#N^Od
this.hasPrePage = hasPrePage; A)VOv`U@2
this.hasNextPage = hasNextPage; sQt@B#;
this.everyPage = everyPage; dn5T7a~
this.totalPage = totalPage; W;0_@!?mr}
this.currentPage = currentPage; 8(S'g+p
this.beginIndex = beginIndex; 4I2ppz
} Xv'64Nc!;
%7L'2/Y2x
/** K,^b=_]
* @return ]Q)TqwYF
* Returns the beginIndex. y6G[-?"/Q
*/ 1M<'^(t3d
publicint getBeginIndex(){ 4#=^YuKaF1
return beginIndex; 'rd{fe_g!
} {qh`8
[.6uw=;o
/** `#9ZP
* @param beginIndex eQYW>z'%,
* The beginIndex to set. 2>s:wABb /
*/ gE8>5_R|
publicvoid setBeginIndex(int beginIndex){ sg9ZYWcL
this.beginIndex = beginIndex; Be}Cj(C
} Ak4iG2
=I*"vwc?
/** eBBh/=Zc
* @return rKR<R(=!=
* Returns the currentPage. 9-L.?LG
*/ 6idYz"P %
publicint getCurrentPage(){ I-+D+DhRx
return currentPage; 9BHl2<&V
} &;C|=8eB
znu?x|mV
/** D4
e)v%
* @param currentPage w`i3B@w
* The currentPage to set. "$m3xO
*/ @dO~0dF
publicvoid setCurrentPage(int currentPage){ Y}F+4
this.currentPage = currentPage; b/<n:*$
} ukhI'alS,
R#Ss_y
/** ]l&_Pv!!
* @return <;_X=s`f,
* Returns the everyPage. q}+9$v
*/ aIJ[K
publicint getEveryPage(){ /A{znE
return everyPage; 6h;$^3x$
} ;:'A{&0N
=1LrU$\
/** -LQ%)'J ZN
* @param everyPage ]k >S0
* The everyPage to set. "rkP@ja9n
*/ fq\E$'o$
publicvoid setEveryPage(int everyPage){ a}%>i~v<
this.everyPage = everyPage; NlWIb2,
} ][#]4_
"z7.i{
/** B&<Z#C:I
* @return 3<?(1kSo>>
* Returns the hasNextPage. `ZNzDr
*/ ?$8OVq.w,
publicboolean getHasNextPage(){ *Q5/d9B8TN
return hasNextPage; C2bN<K
} /z~;.jRg
/|hKZTZJdN
/** MheP@ [w|@
* @param hasNextPage opdi5e)jK
* The hasNextPage to set. u'P@3'P
*/ ar>S_VW*
publicvoid setHasNextPage(boolean hasNextPage){ Pm
V:J9
this.hasNextPage = hasNextPage; +=;F vb
} %'@&j2j>
lts{<AU~
/** 3kQky
* @return }&EPH}V2n
* Returns the hasPrePage. }J"}poB:
*/ c1!h;(&
publicboolean getHasPrePage(){ eX$u
return hasPrePage; ~?S/0]?c
} N(&,+KJ)
:Q!U;33aG
/** /R@eOl}D
* @param hasPrePage o3j4XrK
* The hasPrePage to set. y\V!OY@
*/ 8 w^i
publicvoid setHasPrePage(boolean hasPrePage){ IQY\L@"
this.hasPrePage = hasPrePage; &5c)qap;n
} :/d#U:I
mI?AI7DqK
/** =d&
* @return Returns the totalPage. M0 =K#/
* qp'HRh@P2:
*/ `3\5&B