Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 /ho7O/aAa
A/A;'9
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 6
#m:=
^2}p%j>
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 4Y
`=`{Q
WLkfo6Nw
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 `vc?*"
sb"h:i>O4
。 kmZ
U;Z
+F@ZVMp
分页支持类: aP}30E*Y
59X'-fg ,
java代码: Y0Bd[
RJ0:O
f~-qjEWm
package com.javaeye.common.util; .;,` bH0
g* DBW,
import java.util.List; N`xXH
1k dQh&~G
publicclass PaginationSupport { 1h,m
t*dd/a
publicfinalstaticint PAGESIZE = 30; d:{#Dk#
[+.P'6/[$R
privateint pageSize = PAGESIZE; z5q(
c)B
<d#
privateList items; 9JBVG~m+
25wvB@0&
privateint totalCount; -?Kd[Ma
K^f&+`v6_
privateint[] indexes = newint[0]; ]rMHO
Q35jJQ$<`
privateint startIndex = 0; #y>q)Ph
$dkkgsw7
public PaginationSupport(List items, int ^w6~?'}
G Ebm$\
totalCount){ GX,)~Syw*
setPageSize(PAGESIZE); v~`'!N8
setTotalCount(totalCount); Qt(4N!j
setItems(items); =Eb4Iyz
setStartIndex(0); &T&>4I!'M
} g),t
PGNH<E)
public PaginationSupport(List items, int |:)ARH6l#
{T'M4y=)i
totalCount, int startIndex){ _<m yM2z
setPageSize(PAGESIZE); yDmx)^En
setTotalCount(totalCount); ''3b[<
setItems(items); dk[MT'DV
setStartIndex(startIndex); aYrbB#
} 6)j/"9oY
qfS
]vc_N
public PaginationSupport(List items, int a=&{B'^G
;tG@ 6
totalCount, int pageSize, int startIndex){ lSK<LytB
setPageSize(pageSize); r$<4_*
setTotalCount(totalCount); rfHAz
setItems(items); 1|/-Ff"1@
setStartIndex(startIndex); F|!
ib5
} 2Mw^EjR
0*F<tg,+]
publicList getItems(){ k@Mt8Ln
return items; \I+#M-V
} p|RFpn2ygF
\wM8I-f!
publicvoid setItems(List items){ fA" VLQE
this.items = items; -v &
} |@Sj:^cJD
:=e"D;5
publicint getPageSize(){ ZMGthI}~-
return pageSize; sMNhD/bb
} G-Dc(QhU&
b 67l\L
publicvoid setPageSize(int pageSize){ l,@rB+u
this.pageSize = pageSize; #Zj3SfU~`
} .ovG_O
(pT7m
publicint getTotalCount(){ r9y(j
z
return totalCount; @D+2dT0[M
} 716r/@y$6
/M5R<rl
publicvoid setTotalCount(int totalCount){ C|-QU
if(totalCount > 0){ ^j *H
this.totalCount = totalCount; wS @-EcCB
int count = totalCount / Cu`ty] -'
GB8>R
pageSize; Y@2v/O,\
if(totalCount % pageSize > 0) ;Yu|LaI\<m
count++; ,ocAB;K
indexes = newint[count]; i>{.Y};
for(int i = 0; i < count; i++){ [|tlTk
indexes = pageSize * #H-EOXy
kJk6lPSqi7
i; b<8,'QgB
} "pTU&He
}else{ ),5|Ves;t[
this.totalCount = 0; cg).b?g
} &at>sQ'
} ]%ey rbU
%[WOQ.Sh
publicint[] getIndexes(){ Y0xn}:%K
return indexes; SI9PgC
} ?G<.W[3
49-wFF
publicvoid setIndexes(int[] indexes){ N-YCOSUu
this.indexes = indexes; ='Fh^]*5
} BI :O?!:9)
?cKe~Q?3
publicint getStartIndex(){ DW>|'w %
return startIndex; =cWg39$(I
} E@CK.-N|
EPd
publicvoid setStartIndex(int startIndex){ 0;Z] vl/|
if(totalCount <= 0) `L7Cf&W\l8
this.startIndex = 0; cxpG6c
elseif(startIndex >= totalCount) -s&7zqW
this.startIndex = indexes ^k5# {?I
fx*Q,}t
[indexes.length - 1]; O\q-Ai
elseif(startIndex < 0) V(P 1{g
this.startIndex = 0; "5b4fQ;x
else{ s4vj
this.startIndex = indexes nXAGwU8a
bmI6OIWl
[startIndex / pageSize]; bu,xIT ^
} a+,zXJQYq
}
PaZd^0'!Z
MoC@n+Q+@
publicint getNextIndex(){ >TG#
int nextIndex = getStartIndex() + -fT}Nj\
7_CX6:
pageSize; 5
[X,?
if(nextIndex >= totalCount) P 9?I]a)G
return getStartIndex(); eZMfn$McJv
else <K {|#ND#
return nextIndex; 7_c/wbA#me
} tKYg
nUScDb2|
publicint getPreviousIndex(){ 7Y6b<:4j
int previousIndex = getStartIndex() - 8 c5=Px2\
+@qIDUiF3
pageSize; _WN\9<
if(previousIndex < 0) 0;tu}]jnN
return0; >Y=qSg>Ik
else $/"QYSF
return previousIndex; v{pW/Fu~
} EnP>
q]#j,}cN9
} LX{mr{
BDT"wy8
9=.7[-6i9
}.r)
抽象业务类 dfWtLY
java代码: Ib2n Bg>j
;"JgNad
'c#AGi9
/** k%?qN,Cl
* Created on 2005-7-12 >/G[Oo
*/ rAh|r}R
package com.javaeye.common.business; ,*Wp$
%hi]oz
import java.io.Serializable; &?Z<"+B8S
import java.util.List; <6.?:Jj
4P}d/w?'KL
import org.hibernate.Criteria; y/;DA=
import org.hibernate.HibernateException; dZuPR
import org.hibernate.Session; Qt.|YB8
import org.hibernate.criterion.DetachedCriteria; |>Pz#DCy
import org.hibernate.criterion.Projections; ZDx1v_xr
import g5lK&-yu]
2)9XTY6$
org.springframework.orm.hibernate3.HibernateCallback; GC7W7B
import $J =`fx
[BKOK7QK|
org.springframework.orm.hibernate3.support.HibernateDaoS cK\'D
_*-b0 }T
upport; +zZ]Txb(
5#mHWBGd7
import com.javaeye.common.util.PaginationSupport; &Y1RPO41J
z-^/<u1p
public abstract class AbstractManager extends ta0 ;:o?/d
qJ[wVNHh!
HibernateDaoSupport { Oar%LSkPRz
,:%
h`P_
privateboolean cacheQueries = false; {hVc,\A
X3HJ3F;==
privateString queryCacheRegion; %J+k.UrM
8^!ib/@v"
publicvoid setCacheQueries(boolean 1pP q)}=+
!*PX-
cacheQueries){ N5 mhs#
this.cacheQueries = cacheQueries; >OKc\m2%Q
} EOXuc9>G
[~ !9t9+~
publicvoid setQueryCacheRegion(String W4"1H0s`l
)!=fy']
queryCacheRegion){ V$bq|r
this.queryCacheRegion = u3\_![Jt?
?f:ND1jU
queryCacheRegion; J|CCTXT
} 3{M0iNc1
.p%V]Ka
publicvoid save(finalObject entity){ 2]V8-
getHibernateTemplate().save(entity); X0 ]Se(
} WF-^pfRq~
I].ddR%
publicvoid persist(finalObject entity){ 7>f)pfLM
getHibernateTemplate().save(entity); &/?OP)N,}
} BiA^]h/|
K0\`0E^,
publicvoid update(finalObject entity){ kH?PEA! \
getHibernateTemplate().update(entity); Ymm*p,`
} _ygdv\^Tet
DTl&V|h$
publicvoid delete(finalObject entity){ BirnCfj/2
getHibernateTemplate().delete(entity); ik5"9b-\<
} I5E+=.T*ar
et<@3wyd]
publicObject load(finalClass entity, ]F #0to
f{U,kCv
finalSerializable id){ ?f*>=;7=
return getHibernateTemplate().load j-v/;7s/B
#J~xKyJi'
(entity, id); ;}'Z2gZB
} Q}uh`?t
wsgT`M'J[
publicObject get(finalClass entity, -BH T'zq1S
\~.elKw<U
finalSerializable id){ n<Ki.;-ZE
return getHibernateTemplate().get rB_ESNx
Mo\nY5
(entity, id); } [OEtd{
} H>wXQ5 ?W;
D0yH2[j+
publicList findAll(finalClass entity){ F6"Qs FG
return getHibernateTemplate().find("from =z'533C
m Gx{Vpt
" + entity.getName()); 4MRN{W6
} mxICQ>s
b
1-PFM-
publicList findByNamedQuery(finalString W=4|ahk$
Lbu,VX
namedQuery){ Vk%W4P"l
return getHibernateTemplate j#${L6
H%;pPkIi
().findByNamedQuery(namedQuery); Tj=@5lj0
} PMe 3Or@
@'"7[k!y;
publicList findByNamedQuery(finalString query, lr$,=P`
)6
K)UA
finalObject parameter){ ?uXY 6J"
return getHibernateTemplate ZK8DziO
:fQN_*B4@4
().findByNamedQuery(query, parameter); Fl++rUT
} 4|NcWpaV7
0$|wj^?U
publicList findByNamedQuery(finalString query, gXB&Sgjo
jR{t=da
finalObject[] parameters){ QY$4D;M`g6
return getHibernateTemplate ^?T,>ZI
Q`Ug tL
().findByNamedQuery(query, parameters); Nrc-@ ]
} >Vb V<ak
;(IAhWE?7
publicList find(finalString query){ :KsBJ>2ck
return getHibernateTemplate().find 4}Hf"L[ l
Co`:D
(query); H}lbF0`
} aq8mD^j -&
cd$,,
publicList find(finalString query, finalObject }TU2o3Q
o+?Ko=vYw
parameter){ IXsOTBM
return getHibernateTemplate().find "~T06!F45
<"`P;,S
(query, parameter); !&o>zU.
} =A;79@bY
j4h?"
public PaginationSupport findPageByCriteria K\$z,}0
)`zfDio-1V
(final DetachedCriteria detachedCriteria){ /!-ypIY
return findPageByCriteria e_Q(l'f
nG"Ae8r
(detachedCriteria, PaginationSupport.PAGESIZE, 0); }:+P{
} a!:R_P}7
Ls NJ3oy
public PaginationSupport findPageByCriteria /7C%m:
bc\?y2
3
(final DetachedCriteria detachedCriteria, finalint ~q{QquYV
l%7^'nDn
startIndex){ w4Ku1G#jC
return findPageByCriteria yj9Ad*.
+ID%( :
(detachedCriteria, PaginationSupport.PAGESIZE, kYkck]|
u!cA_,
startIndex); [?#-JIZ3T
} p fg>H
IeBb#Qedz
public PaginationSupport findPageByCriteria .T}S[`Yx5
=Lr#
*ep[
(final DetachedCriteria detachedCriteria, finalint r5&?-G
="]y^&(L(
pageSize, Fi"TY^-E;
finalint startIndex){ .vXe}%
return(PaginationSupport) 2|LkCu)~,"
y#5;wb<1
getHibernateTemplate().execute(new HibernateCallback(){ t8-LPq
publicObject doInHibernate RQ[6svfP
e6^iakSd.L
(Session session)throws HibernateException { uB35CRd
Criteria criteria = i%9xt1c_
/f
-\
3
detachedCriteria.getExecutableCriteria(session); JC4Z^/\.
int totalCount = ) 2Hl\"F
+K[H!fD
((Integer) criteria.setProjection(Projections.rowCount j(\jYH>
SL>0 _
()).uniqueResult()).intValue(); O)G^VD s
criteria.setProjection Zh.[f+ l]
vjD||!g'
(null); on0>_-n)
List items = Y ptP_R:2p
sTO9>~sj
criteria.setFirstResult(startIndex).setMaxResults Z6oA>D
0G/_"}@
(pageSize).list(); z@J;sz
PaginationSupport ps = lF!Iu.MM 9
WhR'MkfL
new PaginationSupport(items, totalCount, pageSize, ca8.8uHY\
pc<A
,?
startIndex); %ck/ Z
return ps; <2 S?QgR,
} 8BwJWxBQ
}, true); h-[FUPfuw
} Mhze!!
b
`.h+=3
public List findAllByCriteria(final Hsz).u
'}
LAZQ"
DetachedCriteria detachedCriteria){ !Ql&Ls
return(List) getHibernateTemplate z c,Q
lDhuL;9e
().execute(new HibernateCallback(){ }K\m.+%=d
publicObject doInHibernate < 5#}EiT5
{ Sn
J
(Session session)throws HibernateException { SiSxym
Criteria criteria = Oe}6jcb6&
*1
l"|=_&s
detachedCriteria.getExecutableCriteria(session); BA|*V[HBE
return criteria.list(); UI.>BZ6}
} w
B[H&
}, true); +46?+kKt
} 3L(vZ2&
z8hAZ?r1`
public int getCountByCriteria(final :HG5{zP
mmrz:_
DetachedCriteria detachedCriteria){ >vY5%%}
Integer count = (Integer) j
/=4f
.[4Dvt|>6
getHibernateTemplate().execute(new HibernateCallback(){ >D/+04w
publicObject doInHibernate B>W!RyH8o
2s:$4]K D
(Session session)throws HibernateException { }N<> z
Criteria criteria = G8_|w6
. 'rC'FT
detachedCriteria.getExecutableCriteria(session); S?Z"){
return vS'5Lm
,\n%e'
criteria.setProjection(Projections.rowCount A&6qt
C|Vz
`FY
()).uniqueResult(); |cUBS)[)X
} iZ-"l3)D
}, true); |VD}:
return count.intValue(); )$e_CJ}9e
} 7cJh^M
} w(Hio-l=
42mZ.,<
uKocEWB=/F
H '(Ky
Bys _8x}
@fxDe[J:
用户在web层构造查询条件detachedCriteria,和可选的
@Iy&Qo
)~l`%+
startIndex,调用业务bean的相应findByCriteria方法,返回一个 @-QDp`QtI
y6S:[Z{~A
PaginationSupport的实例ps。 OJF41Z
S
2SJFp
ps.getItems()得到已分页好的结果集 Zl+Ba
ps.getIndexes()得到分页索引的数组 {Jj
vF
ps.getTotalCount()得到总结果数 h^$c
ps.getStartIndex()当前分页索引 VDP \E<3"
ps.getNextIndex()下一页索引 2{o
e J
ps.getPreviousIndex()上一页索引 0*Is#73rjY
jVtRn.qh
m'i^BE
R59'KR2?
52JtEt7E
#ig* !
<^(g<B`>
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 &.}Zj*BD
CsND:m
,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 Tp?l;DU
EFb"{L
一下代码重构了。 (G3S+T 9
u9}k^W)E
我把原本我的做法也提供出来供大家讨论吧: 'P^6H$0
%>G(2)Fb\\
首先,为了实现分页查询,我封装了一个Page类: >1n[Y- r
java代码: H(TY.
]TmxCTVL
!:^lTvYWZH
/*Created on 2005-4-14*/ q|+`ihut
package org.flyware.util.page; T[YGQT|B
wJQ"|
/** otgU6S7F
* @author Joa y.:Z:w6$
* b0_Ih6
*/ $h( B2
publicclass Page { "2'pS<|
} QqmDK.
/** imply if the page has previous page */
`fRp9o/
privateboolean hasPrePage; oG_-a(N
xiW;Y{kZ
/** imply if the page has next page */ s;;"^5B.
privateboolean hasNextPage; xrPC
q g+bh
/** the number of every page */ p7pJ90~E
privateint everyPage; (wRJ"Nwu
&gL &@';,
/** the total page number */ 8T#tB,<fFW
privateint totalPage; \%FEQa0u
,{br6*E
/** the number of current page */ GDW$R`2
privateint currentPage; J!GWP:b3
1/H9(2{L
/** the begin index of the records by the current XPt<k&o1,
@m=xCg.Z
query */ &~xzp^&
privateint beginIndex; =R
<X!@
/T_ G9zc
`IQ76Xl
/** The default constructor */ 7:D@6<J?
public Page(){ >; A7mi/
u#l@:p
} 8sG0HI$f+
rIE
m
/** construct the page by everyPage 2yyJ19Iul
* @param everyPage ^U`Bj*"2
* */ [;F%6MPK^
public Page(int everyPage){ 0"V L6$
this.everyPage = everyPage; }smPP*
} h8Bs=T
!A\Qwg>
/** The whole constructor */ \MA4>
public Page(boolean hasPrePage, boolean hasNextPage, $bd&$@sA
azxGUS_i<
#Wz7ju;
int everyPage, int totalPage, ; SS/bS|
int currentPage, int beginIndex){ fgW>U*.ar
this.hasPrePage = hasPrePage; x@ZxV*T^
this.hasNextPage = hasNextPage; k yFq
this.everyPage = everyPage; (0=e ,1 n
this.totalPage = totalPage; vncak
this.currentPage = currentPage; /@<&{_sybp
this.beginIndex = beginIndex; 'w8k*@cQ
} U '#Xwax
<&+\X6w[
/** Y|NANjEAfm
* @return s
9Y'MQo*
* Returns the beginIndex. /2!Wy6p
*/ 5VU
5kiCt
publicint getBeginIndex(){ E8Jy!8/X9T
return beginIndex; \C
)S3!h
} ?4kM5NtP
t@`w}o[#
/** _i=431Z40
* @param beginIndex 7$l! f
* The beginIndex to set. ._uXK[c7P
*/ "lFS{7
publicvoid setBeginIndex(int beginIndex){ ^11y8[[
this.beginIndex = beginIndex; 6i6m*=h
} 9Dq^x&z(
u]W$'MyY
/** vCf{k
* @return @MS}tZ5
* Returns the currentPage. SpM|b5c5
*/ xb2xl.2x!
publicint getCurrentPage(){ KkIxtFM
return currentPage; g/o@,_
} `FjU2
O
J 8z|ua
/** "h-G=vo,kl
* @param currentPage <}@*i
* The currentPage to set. XA &