Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 0Ei\VVK>
c ,Qw;
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 e_YW~z=6t
]R97n|s_
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
=~,$V<+c
bv .EM
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ON:LPf>"-
8yY"x
['
。 71K\.[ =-
Q,[rrG;?@
分页支持类: }~7H2d);-
R
tXF
java代码: Bq~AU#
pP?<[ql[w
43UJ#rF
package com.javaeye.common.util; }`+O$0A
=YS!soO
import java.util.List; *O"%tp6
FCsyKdM
publicclass PaginationSupport { wxdh?sQ
,apd3X%g
publicfinalstaticint PAGESIZE = 30; uYG #c(lc
Ws2prh^e(
privateint pageSize = PAGESIZE; 9OrA9r
FE$M[^1_
privateList items; 9$B)hrJo
-~QlHp&SY
privateint totalCount; f 3nnXE"
A5 &>!y
privateint[] indexes = newint[0]; <) >gg!
|[lxV&SD.
privateint startIndex = 0; jUV#HT
r< d?
public PaginationSupport(List items, int $ioaunQKP
*#X+Gngo
totalCount){ B`'}&6jr.
setPageSize(PAGESIZE); $i1>?pb3
setTotalCount(totalCount); 6/p]jN
setItems(items); |q1b8A \
setStartIndex(0); KDNTnA1c
} *~\;&G29Y
aufcd57
public PaginationSupport(List items, int b;&Yw-\nZ;
`Gy>tD.#V-
totalCount, int startIndex){ XnNOj>!
setPageSize(PAGESIZE); Z_eqM4{
setTotalCount(totalCount); Mt7X<?GZm
setItems(items); #R"9)vHp
setStartIndex(startIndex); ]5qjK~,4b
} brpN>\
":(Cpf0
public PaginationSupport(List items, int UcKWa>:Fi
rm7*l<v6
totalCount, int pageSize, int startIndex){ 'tq\<y
setPageSize(pageSize); M8^ziZY
setTotalCount(totalCount); 4nVO.Ud0$X
setItems(items); V!yp@%D
setStartIndex(startIndex); Q!BkS=H30K
} Q@3ld6y
AOvH&9**
publicList getItems(){ Z.cG`Km*
return items; 3!ajvSOI9j
} bOnukbJ
j,gM+4V^
publicvoid setItems(List items){ DcFV^8O&
this.items = items; .q'FSEkMJ
} h:US]ZC^Z
K2vPj|
publicint getPageSize(){ !'6J;Fb#
return pageSize; t&p:vXF2
} $yR{ZFo
@eG#%6">
publicvoid setPageSize(int pageSize){ ^YB\\a9
this.pageSize = pageSize; T^f&58{ 7
} 0X}w[^f
!Cv<>_N).
publicint getTotalCount(){ [8om9 Z3
return totalCount; BhhK| U/
} .[eSKtbc)
FHnHhB [
publicvoid setTotalCount(int totalCount){ SbQ{ >
if(totalCount > 0){ ni 02N3R
this.totalCount = totalCount; lzQ&)7`
int count = totalCount / f R{WS:Pv
":ws~Zep
pageSize; =^".{h'-
if(totalCount % pageSize > 0) ^HU=E@
count++; m-pIFL<^N
indexes = newint[count]; I{X@<o}
for(int i = 0; i < count; i++){ \C'I l
w
indexes = pageSize * .bY1N5=sz
+MZ2e^\F
i; `zvT5=*-#
} u.xA}yVS
}else{ U%SNROj
this.totalCount = 0; O.m.]%URW
} Vv*5{_
} Ug[F3J|Mu
5"Xo R)
publicint[] getIndexes(){ 6b1 Uj<
return indexes; mhHm#
} ::Ve ,-0
n$\6}\k
publicvoid setIndexes(int[] indexes){ KcMzZ!d7m
this.indexes = indexes; Lh5+fk~i~8
} l<+,(E=
<P
Z\qE*+y
publicint getStartIndex(){ _ZvX" {y~
return startIndex; EWvid4QEi
} 9DocId.
h?O%XnD
publicvoid setStartIndex(int startIndex){ }e;p8)]Wl
if(totalCount <= 0) nh_xbo5L[
this.startIndex = 0; 70 DQ/b
elseif(startIndex >= totalCount) j(2tbWg9-
this.startIndex = indexes oU{-B$w
8i+jFSZ$
[indexes.length - 1]; C ^ k3* N
elseif(startIndex < 0) Yv|bUZ@
this.startIndex = 0; _d"Y6
0
else{ 9#A{C!75(y
this.startIndex = indexes tZ6v@W
!&<Wc^PG
[startIndex / pageSize]; F^[Rwzv>c
} Ub-k<]yZ
} 9R<J$e
,HjHt\!~<
publicint getNextIndex(){ /)HEx&SQmZ
int nextIndex = getStartIndex() + ^SES')x
vN[m5)aT
pageSize; @x\gk5
if(nextIndex >= totalCount) (4/`@;[
return getStartIndex(); P24
else [+5SEr}
return nextIndex; l'X?S(fiV
} :r[-7
[/
'"NdT7* +
publicint getPreviousIndex(){ eXtF[0f
int previousIndex = getStartIndex() - ~s^6Q#Z9|
fTnyCaB
pageSize; 1</t #r
if(previousIndex < 0) Zi '8~iEH
return0; P<w>1
=
else E9NGdp&-Ah
return previousIndex; mm~o%1|WR
} t3kh]2t
|x~ei_x7.p
} LB 5EGw
UmHb-uk ;
>Sl:Z ,g;
Sv[_BP\^h
抽象业务类 XcW3IO
java代码: Op)R3qt{
o3`gx
P)
0=@{(
/** (:hmp"S
* Created on 2005-7-12 KLM^O$=
*/ I2!&=" 7@
package com.javaeye.common.business; pPqbD}p
hB1 iSm
import java.io.Serializable; 5nlyb,"^g
import java.util.List; "Kf~`0P
AZm)$@e)
import org.hibernate.Criteria; oA^
]x>
import org.hibernate.HibernateException; JL+[1=uE1L
import org.hibernate.Session; 5|H(N}S_
import org.hibernate.criterion.DetachedCriteria; t@mw f3,
import org.hibernate.criterion.Projections; 5+PBS)pJ]%
import /VOST^z!
RAJ|#I1
org.springframework.orm.hibernate3.HibernateCallback; Kwmo)|7uPU
import ;bu;t#
'48|f`8$
org.springframework.orm.hibernate3.support.HibernateDaoS eh#
(}v
- cC(d$y
upport; Q? |M BTo
k{&E}:A
import com.javaeye.common.util.PaginationSupport; =cX"gI[
sJ*U Fm{
public abstract class AbstractManager extends vG=$UUh@~
*`/@[S2,cu
HibernateDaoSupport { gG|1$
D+nj[8y
privateboolean cacheQueries = false; @G&xq"Fg7
YV+dUvz
privateString queryCacheRegion; `e:RZ
m,"tdVo .
publicvoid setCacheQueries(boolean Nd!=3W5?
;-w PXXR
cacheQueries){ I>\?t4t
this.cacheQueries = cacheQueries; Tp.iRFFkP
} dQoMAsxzM
H_^u_%:e
publicvoid setQueryCacheRegion(String `SpS?mWA
00
,jneF
queryCacheRegion){ ty8!"-V1
this.queryCacheRegion = JH,fg K+[
m|?J^_
queryCacheRegion; mAERZ<I
} T[II;[EiE
:9< r(22
publicvoid save(finalObject entity){ P_Ja?)GT
getHibernateTemplate().save(entity); 2n,73$s
} 9O_N
iu0
mqxy(zS]
publicvoid persist(finalObject entity){ W-B[_
getHibernateTemplate().save(entity); Fi}rv[`XY[
} yM ~D.D3H
!!pi\J?sk
publicvoid update(finalObject entity){ gDBQ\vM8
getHibernateTemplate().update(entity); > %*X2'^
} + {dIs
DccsVR`7
publicvoid delete(finalObject entity){ q.Mck9R7
getHibernateTemplate().delete(entity); !S}Au Mw
} @_Oe`j^
Z9EQ|WfS#-
publicObject load(finalClass entity, _ o3}Ly}
c.> (/
finalSerializable id){ xJ.!Q)[
return getHibernateTemplate().load q/G5aO*
CzbNG^+
(entity, id); +u)$o
} PA[Rhoit,
s&hP^tKT
publicObject get(finalClass entity, `h]f(
Y3&ecEE
finalSerializable id){ F'Vl\qPt
return getHibernateTemplate().get sM_e_e
oVgNG!/c0
(entity, id); }#
^PbM
} +Ea XS
X Y?@^
publicList findAll(finalClass entity){ )o,0aGo>Of
return getHibernateTemplate().find("from @=1``z#
}Elce}
" + entity.getName()); 1#uw^{n
} ^!tI+F{n{
J4X35H=Z
publicList findByNamedQuery(finalString jzw?V9Ijb
U /Fomu
namedQuery){ VG7#6)sQoK
return getHibernateTemplate q,Q|Uvpk
h}_q
().findByNamedQuery(namedQuery); J8'zvH&I
} m@?e
<$
' 1nU[,Wj
publicList findByNamedQuery(finalString query, |Q;1;QXd
T`;M!-)2
finalObject parameter){ V0(ABi:d
return getHibernateTemplate 1\kehCt
u'."E7o#
().findByNamedQuery(query, parameter); GC3L2C0)k
} 8B9zo&
#{1fb%L{i
publicList findByNamedQuery(finalString query, .9QQ]fLs
O,v$'r W
finalObject[] parameters){ *5)!y
d
return getHibernateTemplate >$F]Ss)$
]vErF=[U,
().findByNamedQuery(query, parameters); ';F][x 5j
} 1>{(dd?L
2N]s}/l
publicList find(finalString query){ {D#`+uw
return getHibernateTemplate().find xx8na8
V|`|CVFo]
(query); Zv93cv
} VV0$L=mo
>AJ|F)
publicList find(finalString query, finalObject [l:.Q?? )|
Mr(3]EfgO
parameter){ eW%jDsC
return getHibernateTemplate().find RdHR[Usm
`Mg
"!n`
(query, parameter); eo[^ij
} 7m:, -xp
1doqznO
public PaginationSupport findPageByCriteria ,,gYU_V
j C?
(final DetachedCriteria detachedCriteria){ (0S7
return findPageByCriteria rJ>8|K[kt
f6) H!SI
(detachedCriteria, PaginationSupport.PAGESIZE, 0); ^Du_e(TiyK
} ZxQP,Ys_Y
wxxC&!
public PaginationSupport findPageByCriteria R2@u[
a6_`V;
(final DetachedCriteria detachedCriteria, finalint 'iK0Wr
uip]K{/A!e
startIndex){ rg\w!L(
return findPageByCriteria #4>F%_
XLT<,B}e
(detachedCriteria, PaginationSupport.PAGESIZE, W!*vO>^1W
AbB>ZT>hR
startIndex); \mloR
'
} '>BHwc
0saEcJ-
public PaginationSupport findPageByCriteria v]~[~\|a
[qB=OxH?
(final DetachedCriteria detachedCriteria, finalint @$]h[
S8l+WF4q
pageSize, , fn=%tiUk
finalint startIndex){ ;]!
return(PaginationSupport) _NFJm(X.
Pif1sL6'
getHibernateTemplate().execute(new HibernateCallback(){ +8M{y D9#
publicObject doInHibernate Hw?
J1#1IE
lRb)Tz6SE
(Session session)throws HibernateException { ??PpHBJ')
Criteria criteria = it$~uP |
65v'/m!ys
detachedCriteria.getExecutableCriteria(session); ~WSC6Bh@9
int totalCount = |wx1
[xZ
[Wc 73-
((Integer) criteria.setProjection(Projections.rowCount Alz#zBGb
ff0,K#-
()).uniqueResult()).intValue(); syF/jWM5
criteria.setProjection (!s[~O 6
jk@]d5
(null); d<o
List items = ^_uzr}LE`
~gN'";1i
criteria.setFirstResult(startIndex).setMaxResults c1[;a>
H@zpw1fH+
(pageSize).list(); U!4 ^;
PaginationSupport ps = /_P`xm+=AC
Tb^9J7]
new PaginationSupport(items, totalCount, pageSize, \] K-<&f
P\JpE
startIndex); j*"s~8u4
return ps; H UjmJu6f{
} rYl37.QE
}, true); !wgj$5Rw.
} )'JSu=Ej
6x 0>E^~
public List findAllByCriteria(final B}W^s;h
1K>4i. X
DetachedCriteria detachedCriteria){ Rjf|
return(List) getHibernateTemplate ?k#%AM
qF?S[Z;
().execute(new HibernateCallback(){ <qBPN{'a"
publicObject doInHibernate \xt!b^d0
'py
k
(Session session)throws HibernateException { #!2gxm;g
Criteria criteria = (w*$~p
vd~O:=)4
detachedCriteria.getExecutableCriteria(session); x{m)I<.:
return criteria.list(); 4[?Q*f!
} ep5aBrN]"
}, true); L>B0%TP^
} GCrN:+E0FJ
N`M5`=.
public int getCountByCriteria(final xK/`XY
wgrYZ^]
DetachedCriteria detachedCriteria){ rO
NLbrj
Integer count = (Integer) Hl#o& *Ui"
3]'3{@{}H
getHibernateTemplate().execute(new HibernateCallback(){
#xmUND`@
publicObject doInHibernate *jYwcW"R{z
-&c@c@dC
(Session session)throws HibernateException { {PU[MHZF
Criteria criteria = ]n{2cPx5d
xsfq[}eH<
detachedCriteria.getExecutableCriteria(session); .D :v0Zm}m
return tQ/U'Ap&
-$7Jc=:>
criteria.setProjection(Projections.rowCount thh, V
?F-,4Ox{/
()).uniqueResult(); 1xw},y6T2
} Z1Ms~tch
}, true); :!%oQQO
return count.intValue(); X**wRF
} R{T4AZ@,'
} 6c2fqAF>i
F?UL0Q|u v
#8PjYB
!o`al` q'
vOqT Ld
j1BYSfX'
用户在web层构造查询条件detachedCriteria,和可选的 ?}W:DGudZ
?B-aj
startIndex,调用业务bean的相应findByCriteria方法,返回一个 ,yB-jk?
D!:Qy@Zw
PaginationSupport的实例ps。 bc+'n
hJ|z8Sy@1
ps.getItems()得到已分页好的结果集 lB-Njr
ps.getIndexes()得到分页索引的数组 })J]D~!p
ps.getTotalCount()得到总结果数 wtZe\h
ps.getStartIndex()当前分页索引 F*a+&% Q
ps.getNextIndex()下一页索引 t<e?f{Q5
ps.getPreviousIndex()上一页索引 CSs3l
2W}RXqV<
z.QW*rW9
}%VHBkuc
1Ao"DxZHy7
"MyYu}AD
rP*?a~<
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Fr3Q"(
>9|Q,/b0
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 mk[n3oE1
a1?Y7(alPU
一下代码重构了。 y_\d[
*QrTZ$\C
我把原本我的做法也提供出来供大家讨论吧: Ngg (<ZN
Cu0 /TeEM
首先,为了实现分页查询,我封装了一个Page类: d~.#K S
java代码: A0'Yfuie
b+{yF
c^m}ep\F5L
/*Created on 2005-4-14*/ /ZAEvdO*P
package org.flyware.util.page; " I:j a7
'06[@Cw
/** ,\Cy'TSz
* @author Joa HbCM{A9
* r=s7be
*/ yM>c**9
publicclass Page { r|
YuHm
u\6:Txqq
/** imply if the page has previous page */ v=|ahsYC
privateboolean hasPrePage; r l!c\
`DEz `
D
/** imply if the page has next page */ 3xeW!~
privateboolean hasNextPage; ).k=[@@V
p`Ax)L\f
/** the number of every page */ `2GHB@S"k
privateint everyPage; 2 &R-zG
;hRo}
+\l
/** the total page number */ [IiwpC
privateint totalPage; SC'fT!
1;SWfKU?.
/** the number of current page */ c\n\gQ:LQ
privateint currentPage; `2{x8A
tM~R?9OaJ
/** the begin index of the records by the current ,*Sj7qb#
y+@7k3"
query */ /I="+
privateint beginIndex; ZE4~rq/W
i:@00)V{,
)
_"`{2
/** The default constructor */ =p$1v{L8
public Page(){ k|1/gd5
*V5R[
} 0z.Hl1
@99@do|C
/** construct the page by everyPage ?PLf+S
* @param everyPage Q!MS_
#O
* */ sFMSH:5z
public Page(int everyPage){ GoZr[=d
this.everyPage = everyPage; V{ECDgP
} Y@F@k(lOo
u1(`^^Ml
/** The whole constructor */ Q%
)fuI
public Page(boolean hasPrePage, boolean hasNextPage, fC52nK&T8
Js ~_8
+,f|Y6L<