Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 k7_I$<YDj
SP
2 8
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 cTZ)"^z!
Kn+=lCk
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 b`cYpcs
\9)[#Ld
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 Mj0Cat=
p}]q d4j
。 >', y
;kaHN;4?
分页支持类: {7Cx#Ewd
>e5zrgV
java代码: Q 882B1H
^o<:;{
SA6hbcYk
package com.javaeye.common.util; FyD.>ot7M
@%i>XAe#0
import java.util.List; (0*v*kYdL+
nYv#4*
publicclass PaginationSupport { ^6 /j_G
"2n;3ByR
publicfinalstaticint PAGESIZE = 30; L9IGK<
[j6~}zu@
privateint pageSize = PAGESIZE; ||TtNH
G=M] 8+h
privateList items; !awh*Xj6
Oo%!>!Lt,
privateint totalCount; 3
%(Y$8U
3_qdJ<,
privateint[] indexes = newint[0]; ui.'^F<
;?9A(q_Z
privateint startIndex = 0; 7#4%\f+'t
"!&B4
public PaginationSupport(List items, int $fArk36O#
|uha 38~
totalCount){ `ypL]$cW
setPageSize(PAGESIZE); Md(JIlh3
setTotalCount(totalCount); `\FI7s3b
setItems(items); . A<sr
setStartIndex(0); +80 2`eax
} iV)ac\
UC9{m252
public PaginationSupport(List items, int !y vJpdsof
(:?&G9k
"
totalCount, int startIndex){ 'tWAu I
setPageSize(PAGESIZE); o<4D=.g7D
setTotalCount(totalCount); dt-K
setItems(items); QJ<[Zx
setStartIndex(startIndex); n! .2aq
} t!l%/$-
:4;S"p
public PaginationSupport(List items, int <%!J?
.:0M+Jr"
totalCount, int pageSize, int startIndex){ F/<qE!(
setPageSize(pageSize); GAU!_M5 N
setTotalCount(totalCount); yKDZ+3xK]
setItems(items); sMi{"`37
setStartIndex(startIndex); $v&C@l \
} ce5nG0@#
oa0X5}D
publicList getItems(){ J/S{FxNe]
return items; ^@_).:oX7
} _^;;i4VZ
KSOO?X0j
publicvoid setItems(List items){ u( 9X
this.items = items; UD*+"~
} ]V<"(?,K
:o\5K2]:
publicint getPageSize(){ 3_J>y
return pageSize; +Jw{qQR/*
} i| xt f
P0#`anUr1
publicvoid setPageSize(int pageSize){ ;QidDi_s>
this.pageSize = pageSize; IxP^i{/1?
} ]18Ucf
I q,v
publicint getTotalCount(){ uYTCd ZQh
return totalCount; #{>uC&jD
} I<`V_
>ITEd
publicvoid setTotalCount(int totalCount){ nO_!:6o".
if(totalCount > 0){ }N| \
this.totalCount = totalCount; 5Bd(>'ig_
int count = totalCount / WD;)VsP
R92R}=G!
pageSize; K`gc 4:A
if(totalCount % pageSize > 0) l:z};
count++; FQ## 397
indexes = newint[count]; 7:kCb[ji"
for(int i = 0; i < count; i++){ ;Vo mFp L
indexes = pageSize * =, TS MV
U?EG6t
i; (fd[P|G_]
} QT_^M1%
}else{ )d_U)b7i
this.totalCount = 0; #01/(:7
} #ko6L3Pi
} W gZ@N
".M:`BoW4
publicint[] getIndexes(){ 28+HKbgK
return indexes; @H4wHlb
} 'RQiLUF
EOQaY
publicvoid setIndexes(int[] indexes){ C M^r|4K
this.indexes = indexes; >Qk97we'9
} ER2V*,n@
7V/Zr
publicint getStartIndex(){ I}ndRDz[
return startIndex; .pKN4
} 0lf"w@/
l]u7.~b
publicvoid setStartIndex(int startIndex){ +Z$a1Y@
if(totalCount <= 0) }JGq 1
this.startIndex = 0; %Y 2G
elseif(startIndex >= totalCount) 0/*X=5
this.startIndex = indexes q06@SD$
qu!<lW~c
[indexes.length - 1]; *cQz[S@F
elseif(startIndex < 0) 'rh\CA/}D
this.startIndex = 0; ]]3Q*bq4
else{ q!@c_o
this.startIndex = indexes DzE E:&*=
U-ULQ| 6U
[startIndex / pageSize]; |QMT
A5
} Y}ky/?q
} _[0I^o
5 Af?Yxv
publicint getNextIndex(){ v'$ykZ!Z
int nextIndex = getStartIndex() + uAQg"j
3m~U(yho
pageSize; (Y>U6
if(nextIndex >= totalCount) ) _#T c
return getStartIndex(); |/t K-c6J
else JQr36U
return nextIndex; ]ci RiMkT(
} Qv74?B@
| 4%v"U
publicint getPreviousIndex(){ z(r"JNO@
int previousIndex = getStartIndex() - ]svw
CPu C
zM)M_L
pageSize; I>!|3ElT
if(previousIndex < 0) .$OjUlzr-H
return0; 5 5a@)>h
else +
p'\(Z(
return previousIndex; @}Pw0vC
} s?HsUD$b
r@;$V_I
} %va[jJ
U<|B7t4M
"hfw9Qm
:
qr}M
抽象业务类 @!Y.935/0
java代码: ?!rU
|D
z[%[bs2{
:> x:(K
/** ^=3 ^HQ'Zm
* Created on 2005-7-12 hg!x_Eq|
*/ [CsM<:C
package com.javaeye.common.business; 5'),)
p+!f(H
import java.io.Serializable; ^1()W,B~w
import java.util.List; @i\7k(9:A
P%ye$SASd
import org.hibernate.Criteria; yM W'-\
import org.hibernate.HibernateException; =:kiSrBS3t
import org.hibernate.Session; *:k~g].Iz
import org.hibernate.criterion.DetachedCriteria; zCyR<as7
import org.hibernate.criterion.Projections; vxF:vI# @
import kK08W3@&t
T$f:[ye]Z
org.springframework.orm.hibernate3.HibernateCallback; zv&ePq\#
import m<~>&mWr
9$8X>T^
org.springframework.orm.hibernate3.support.HibernateDaoS $]xE$dzJ
"Fo
upport; rE9Ta8j6
.Ydr[
import com.javaeye.common.util.PaginationSupport; @<0h"i
x
$HP/cKu
public abstract class AbstractManager extends 5^bh.uF
3KB|NS
HibernateDaoSupport { 4,o
%e,z
`e4o 1*
privateboolean cacheQueries = false; ZE{aS4c
dVij <! Lu
privateString queryCacheRegion; r{bgTG
?L`MFR
publicvoid setCacheQueries(boolean I=Gr^\x=
"tEj`eR
cacheQueries){ \z&03@Sw
this.cacheQueries = cacheQueries; J{aQ1)
} tvGg@Xs\
hqdC9?\
publicvoid setQueryCacheRegion(String `8.1&fBr
IY-(-
a8
queryCacheRegion){ XL{{7%j
this.queryCacheRegion = "v*oga%
^U R-#WaQ
queryCacheRegion; gNG0k$nP
} vsOdp:Yp9!
eV@4VxaZ
publicvoid save(finalObject entity){ `M towXj
getHibernateTemplate().save(entity); }(8D!XgWa
} z7D*z8,i
#p']-No
publicvoid persist(finalObject entity){ L{4),65
getHibernateTemplate().save(entity); f$~ _FX
}
zZS>+O
GGYX!=]~
publicvoid update(finalObject entity){ oHv{Y
getHibernateTemplate().update(entity); $w 5#2Za
} 0[_O+u
9/@FADh
publicvoid delete(finalObject entity){ ~Rx~g
getHibernateTemplate().delete(entity); BYhmJC|
} -6.i\
B
{o Q(<&Aw
publicObject load(finalClass entity, Yg\{S<wr
5]A$P\7~1
finalSerializable id){ P]~N-xdV
return getHibernateTemplate().load m^W*[^p
;$E~ZT4p
(entity, id); \SoYx5lf
} KqT#zj
W)G2Cs?p
publicObject get(finalClass entity, }Rf}NWU)|
,I9][_
finalSerializable id){ }3
fLV
return getHibernateTemplate().get G.A=hGw
SaX,^_GY
(entity, id); lo IL{2
} v
Ie=wf~D`
bn^mL~
publicList findAll(finalClass entity){ -N /8Ho
return getHibernateTemplate().find("from }.fZy&_
"t3uW6&
" + entity.getName()); tal>b]B;
} $9LGdKZ_D
B;Q`vKY
publicList findByNamedQuery(finalString yoq\9* ?u^
YD0vfwh
namedQuery){ yBXkN&1=%;
return getHibernateTemplate =|j*VF 2y"
(6b?ir ~
().findByNamedQuery(namedQuery); !3b|*].B
} nm{'HH-4
\FY/eQ*07
publicList findByNamedQuery(finalString query, +R{A'Yl[(
yH0yO*RZ
finalObject parameter){ vu
!j{%GO
return getHibernateTemplate 9XJ9~I?
.P|+oYT&g
().findByNamedQuery(query, parameter); 7$Z)fkx.
} T2/v}
t
wa(M?
publicList findByNamedQuery(finalString query, XC+F! R
{y+v-v/#
finalObject[] parameters){ )zk?yY6
return getHibernateTemplate z<3}TD
:JTRRv
().findByNamedQuery(query, parameters); L~?,6
} 8S[<[CH
/Gh
x2B
publicList find(finalString query){ l\A}lC0?J
return getHibernateTemplate().find ".*a)
!DY2{Wb
(query); gnKU\>2k
} rS,*s'G
5~ *'>y
publicList find(finalString query, finalObject wHo#%Y,Nmi
vMW-gk
parameter){ flm,r<*}
return getHibernateTemplate().find P@! Q1pr
4:%El+,_Y
(query, parameter); i"r.>X'Z
} k`iq<b
's7 SZ$(
public PaginationSupport findPageByCriteria M rH%hRV6R
qw
Kh,[]
(final DetachedCriteria detachedCriteria){ gOES2
4$2
return findPageByCriteria g# 9*bF
?=|)n%
(detachedCriteria, PaginationSupport.PAGESIZE, 0); fxtYo,;$
} @'NaA SB
n'x`oI)-
public PaginationSupport findPageByCriteria XSHwE)m
)P(d66yq'u
(final DetachedCriteria detachedCriteria, finalint ]VHdE_7)
{8>_,z^P)
startIndex){ iBPdCp%]`
return findPageByCriteria bCY^.S-
q)z1</B-
(detachedCriteria, PaginationSupport.PAGESIZE, x9{Sl[2&
HPd+Bd
startIndex); Ekg N6S`}
} +^]PBMM1w
U(Hq4D
public PaginationSupport findPageByCriteria }~Kyw7?
f Dm}J
(final DetachedCriteria detachedCriteria, finalint Y+PvL|`O
?SsRN jeL
pageSize, S*DBY~pZy
finalint startIndex){ [<3Q$*Ew
return(PaginationSupport) EiIFVP
[&]YVn>kj
getHibernateTemplate().execute(new HibernateCallback(){ {*5;:QnT
publicObject doInHibernate 7:R{~|R
/="D]K)%b8
(Session session)throws HibernateException { ^JF_;~C
Criteria criteria = fi-&[llg
6&xW9' 6b:
detachedCriteria.getExecutableCriteria(session); XM5;AcD
int totalCount = H?/cG_^y0
7]HIE]#
((Integer) criteria.setProjection(Projections.rowCount Ph7(JV{
U%B]N@
()).uniqueResult()).intValue(); @u'27c_<d3
criteria.setProjection /iJcy:J
37M[9m|D*
(null); M@LaD 5
List items = N-?|]4e/
4[f7X4d$
criteria.setFirstResult(startIndex).setMaxResults Pi]s<3PL
J!^~KN6[
(pageSize).list(); OD@@O9
PaginationSupport ps = {/|8g(
nD?M;XN
new PaginationSupport(items, totalCount, pageSize, $0`$)(Y
k~s>8N:&G
startIndex); /xm} ?t0U
return ps; K&gc5L
} JXR/K=<^
}, true); dW=D]
} {i7Fu+xZj
nY5n%>8
public List findAllByCriteria(final LXLIos55S
EA@$^e[
DetachedCriteria detachedCriteria){ GzZ|T7fm
return(List) getHibernateTemplate (Ss77~W7
f!R^;'a
().execute(new HibernateCallback(){ f6_|dvY3
publicObject doInHibernate cwD*>[j
t%YX-@
(Session session)throws HibernateException { /Geks/
Criteria criteria = Qmc;s{-r;
.Mft+,"
detachedCriteria.getExecutableCriteria(session); `\u),$
return criteria.list(); [{!j9E?(
} $E@.G1T [
}, true); -9<yB
} ,tv9+n@x
Ai_|)
public int getCountByCriteria(final q!h*3mNm
)b2E/G@X&
DetachedCriteria detachedCriteria){ yW=hnV{
Integer count = (Integer) `R=_t]ie
9oau_Q#
getHibernateTemplate().execute(new HibernateCallback(){ )1yUV*6
publicObject doInHibernate ujHzG}2z
ZtK%b+MBP
(Session session)throws HibernateException { p 2f
WL
Criteria criteria = =`.5b:e
`q{'_\gVt(
detachedCriteria.getExecutableCriteria(session); >D^7v(&
return _(s|Q
{4jSj0W
criteria.setProjection(Projections.rowCount {c
EKz\RX
%m\G'hY2
()).uniqueResult(); LVcy.kU@]
} ppo$&W
&z
}, true); H=SMDj)s+
return count.intValue(); :x5o3xE
} Pv$"DEXA2
} 6g,3s?aT
8{=(#]
7/$Z7J!k
(a4y1k t-
J3}C T
m_ONsZHy
用户在web层构造查询条件detachedCriteria,和可选的 jE5
9h
Fu$Gl$qV?%
startIndex,调用业务bean的相应findByCriteria方法,返回一个 ]` Gz_e
QR"O)lP
PaginationSupport的实例ps。 LFM5W&?
(IQ L`3f%
ps.getItems()得到已分页好的结果集 XK9*,WA9r
ps.getIndexes()得到分页索引的数组 R\=\6( "
ps.getTotalCount()得到总结果数 R#^pNJN
ps.getStartIndex()当前分页索引 l{SPV8[i
ps.getNextIndex()下一页索引 X!HSS/'
ps.getPreviousIndex()上一页索引 ^>}[[:( 6/
[67f; ?b
hr"+0KeX
ZjbG&oc
XlcDF|?{.
<yaw9k+P
IG@&l0ARL
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 0_Z|y/I.
Jy[8,X
,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 F"? *@L
?BZ`mrH^
一下代码重构了。 X1QZEl
k#G7`dJl
我把原本我的做法也提供出来供大家讨论吧: (dnc7KrM
K]Cs2IpI
首先,为了实现分页查询,我封装了一个Page类: 3\~fe/z'I
java代码: 3T^dgWXEG
>N"PLSY1
MBrVh6z>
/*Created on 2005-4-14*/ pY5HW2TsY|
package org.flyware.util.page; @uD{`@[
$>37PVVW
/** !/9Sb1_ ~
* @author Joa ! { aA*E{
* 3$f5][+U
*/ /'^>-!8_1
publicclass Page { tl#s:
kF~e3A7C
/** imply if the page has previous page */ :rc[j@|pH
privateboolean hasPrePage; Mp}NUQHE
d(tf: @
/** imply if the page has next page */ \5c -L_
privateboolean hasNextPage; $ =a$z"
AsF`A"Cdw<
/** the number of every page */ 2G>
]W?>
privateint everyPage; #mxfU>vQ:
nezbmpL4
/** the total page number */ hds4_
privateint totalPage; eTHh
T1[ZrY'0
/** the number of current page */ "<R
2oo)^
privateint currentPage; |VF"Cjw?
eV}Tx;1|}
/** the begin index of the records by the current RxG./GY
@n'ss!h
query */ YQsc(6
privateint beginIndex; Y|jesa {x
!9OgA
()JDjzQT
/** The default constructor */ k}qiIMdI
public Page(){ hvZR4|k>
CUcjJ|MZ
} mQuaO#
I,
Qn&^.e9I
/** construct the page by everyPage z3LPR:&Z
* @param everyPage ="E
V@H?U
* */ (ZsR=:9(
public Page(int everyPage){ HKw4}FC*
this.everyPage = everyPage; a$&6a
} Mc^7FWkw
?LM'5
/** The whole constructor */ f_Bf}2Eedj
public Page(boolean hasPrePage, boolean hasNextPage, DMW:%h{
(fb\A6
Vtk|WV?>P+
int everyPage, int totalPage, bUL9*{>G
int currentPage, int beginIndex){ ' "
yl>"
this.hasPrePage = hasPrePage; =_3qUcOP
this.hasNextPage = hasNextPage; vH8%a8V
this.everyPage = everyPage; ]iX$p~riH
this.totalPage = totalPage; Rj=Om
this.currentPage = currentPage; )S?}huX
this.beginIndex = beginIndex; H.K`#W&
} )uWNN"
3f8Z?[Bb@
/** d69VgLg
* @return L@GD$F=<0
* Returns the beginIndex. KK|Jach
*/ OUMr}~/
publicint getBeginIndex(){ l))IO`s=_
return beginIndex; 63$m& ]x
} essW,2,rjC
;Bi{;>3
/** ?Qk#;~\yB
* @param beginIndex )CQ}LbX Zy
* The beginIndex to set. 4N:
;Mo&B
*/ X|G+N(`|(
publicvoid setBeginIndex(int beginIndex){ 5)6%D
this.beginIndex = beginIndex; +06j+I
} lNAHn<ht
X:/t>0e
/** P2F>iK#U
* @return G$<0_0GF
* Returns the currentPage. Y.#+Yh[
*/ *h6i9V%'
publicint getCurrentPage(){ 1A`";E&
return currentPage; =Y[Ae7e
} LcF3P
4
:LG%8Z{R
/** A4h/oMis
* @param currentPage g.s oNqt=
* The currentPage to set. \$"Xr
*/ CVp<SS(
publicvoid setCurrentPage(int currentPage){ HbVLL`06*
this.currentPage = currentPage; V;(LeuDH|
} #CmBgxg+M
pT tX[CE
/** ?Q2pD!L{
* @return RGmpkQEp
* Returns the everyPage. @Iu-F4YT
*/ l-EQh*!j
publicint getEveryPage(){ T(F8z5s5
return everyPage; =ndKG5
} ak[)+_k_
t`B']Ac;T
/** 4uA^/]ygo
* @param everyPage (=9&"UH
* The everyPage to set. c2/HY8ttRD
*/ #J_i 5KmXJ
publicvoid setEveryPage(int everyPage){ Y2EN!{YU
this.everyPage = everyPage; :_*Q
IyW
} %\0 Y1!Hw
KHtY
+93
/** AAcbY;
* @return |#6Lcz7[
* Returns the hasNextPage. !4:,,!T
*/ oDa{HP\O]W
publicboolean getHasNextPage(){ TZg7BLfy
return hasNextPage; UEUTu}4y
} (i8t^
.EO1{2=
/** k7*q.2 0
* @param hasNextPage 8n? .w:Y/
* The hasNextPage to set. ~@lNBF
*/ m@YLZ
publicvoid setHasNextPage(boolean hasNextPage){ 3
6
;hg#
this.hasNextPage = hasNextPage; L%FL{G
} {QID @
CggEAi~
/** S J5kA`
* @return WmA578|l!
* Returns the hasPrePage. >q`X%&l_
*/ ?}[keSEh>
publicboolean getHasPrePage(){ MXb(Z9)]kw
return hasPrePage; sXu]k#I^"
} /7^~*
GSp1,E2J
/** :z\STXq
* @param hasPrePage ;/@R{G{+~;
* The hasPrePage to set. &,zeBFmc
*/ FWg7e3
publicvoid setHasPrePage(boolean hasPrePage){ n[@Ur2&