Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 XXmtpM8
uxVXnQQ
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 G?=X!up(
H@__%KBw
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 +t/VF(!
~mK9S^[
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 `EU=u_N
WABq6q!
。 Z\i@Qa +r
0?SdAF[:z
分页支持类: L ! yl^c
SLz^Wg._
java代码: Vjj30f
62%.ddM4
5Z6$90!k
package com.javaeye.common.util; |/ZpZ7
Z'WoChjM
import java.util.List; ;{BELv-4
rN$_(%m_N
publicclass PaginationSupport { $CHri|
1>57rx"l
publicfinalstaticint PAGESIZE = 30; bbiDY
$}W=O:L+D
privateint pageSize = PAGESIZE; =wU08}
nd_d tsp#
privateList items; "z< =S
OMO.-p
privateint totalCount; u Dm=W36
SMqJMirR
privateint[] indexes = newint[0]; .0.Ha}{6b
+Medu?K
`
privateint startIndex = 0; |nz,srr~
398}a!XM
public PaginationSupport(List items, int gjL>FOe8u
WK/Byd.Z
totalCount){ (Pc:A!}
setPageSize(PAGESIZE); a,M7Bbx
setTotalCount(totalCount); <G\q/!@_
setItems(items); O)`R)MQ)
setStartIndex(0); 2@:Go`mg
} /jeurCQ8#u
t%q@W,2J
public PaginationSupport(List items, int Po(9BRd7
~naL1o_FZ
totalCount, int startIndex){ sh:sPzQ%Jv
setPageSize(PAGESIZE); :s$ rD
setTotalCount(totalCount); y!mjZR,&
setItems(items); !95ZK.UT
setStartIndex(startIndex); #G$_\bt
} b!5W!vcK
gI'4g ZH
public PaginationSupport(List items, int C{-e(G`Yd
t_x\&+W
totalCount, int pageSize, int startIndex){ )g9Zw_3
setPageSize(pageSize); P8).Qn
setTotalCount(totalCount); Kt;h'?
setItems(items); FJp~8
x=
setStartIndex(startIndex); d*3k]Ie%5f
} (Pbdwzao
\;.\g6zX
publicList getItems(){ +P6q
wh\v
return items; t]2~aK<]
} 4}!riWR
~*- eL.
publicvoid setItems(List items){ 2^E.sf$f
this.items = items; e%U0^! 8
} x =5k74
V[5-A $ft
publicint getPageSize(){ *(PGLYK
return pageSize; l}5@6;}
} $cSrT)u:
#
0dN!l;
publicvoid setPageSize(int pageSize){ bQrH8)
this.pageSize = pageSize; ]j~V01p/e
} xCEEv5(5
i~M CY.F
publicint getTotalCount(){ 0.~QA+BD:S
return totalCount; bezT\F/\
} uv/I`[@HK8
k*w]a
publicvoid setTotalCount(int totalCount){ Ky8sLm@
if(totalCount > 0){ imZi7o
this.totalCount = totalCount; C~yfuPr\B
int count = totalCount / 1*Yf[;L
|Eu_K`
pageSize; bT|a]b:
if(totalCount % pageSize > 0) xw&[ 9}Y
count++; [YpSmEn}Y
indexes = newint[count]; ?76Wg::
for(int i = 0; i < count; i++){ *[wy-
fu
indexes = pageSize * cWA9 n}Z
]Vln5U
i; ^}8(o
} .a8N 5{`
}else{ 8T):b2h
this.totalCount = 0; F@& R"-
} 'u@
)F`
} (/a2#iW
<IC=x(T
publicint[] getIndexes(){ S1E=E5
return indexes; SsIy ;l
} 1y2D]h /'
cuO(*%Is1
publicvoid setIndexes(int[] indexes){ 9gZMfP
this.indexes = indexes; |h\e(_G\
} ra0:Lg'
Vl%AN;o
publicint getStartIndex(){ m.iCGX
return startIndex; rr>QG<i;G
} iKnH6}`?U
`TYQ^Zm
publicvoid setStartIndex(int startIndex){ %g5TU 6WP
if(totalCount <= 0) w9rwuk
this.startIndex = 0; h3Nwxj~E
elseif(startIndex >= totalCount) ms{:=L2$$
this.startIndex = indexes Kyt.[" p
!hrXud=#"
[indexes.length - 1]; 9%S{fd\#
elseif(startIndex < 0) GbFLu`I u
this.startIndex = 0; : ^F+mQN
else{ 2?u>A3^R
this.startIndex = indexes n (7m
gPSUxE`O.
[startIndex / pageSize]; w},' 1
} cv=nGFx6
} #=V%S
2~
+dX1`%RR[
publicint getNextIndex(){ 6}='/d-[
int nextIndex = getStartIndex() + K_{f6c<
4v_?i@,L
pageSize; jL(=<R(~y
if(nextIndex >= totalCount) -wH#B<'
return getStartIndex(); }fpK{db
else %6+J]U
return nextIndex; >@KQ )p' `
} CoDu|M%
?&I gD.
publicint getPreviousIndex(){ (o~f6pNB,
int previousIndex = getStartIndex() - M#LQz~E
#+N\u*-S
pageSize; bE#=\kf|
if(previousIndex < 0) IfzHe8>
return0; veFl0ILd
else *%l&'+
return previousIndex; zpV@{%VSj
} x%23oPM
`zGK$,[%
} Tf7$PSupP
gcqcY
r(h&=&T6
BIEc4k5(
抽象业务类 d)1)/Emyj
java代码: $/90('D
f#_ XR
kT@RA}
/**
F' s($n
* Created on 2005-7-12 ^h{AAS>
*/ )8kcOBG^L
package com.javaeye.common.business; }YW0?-G.$
/e1m1 B
import java.io.Serializable; gP"p7\
(
import java.util.List; )X@Obg
%^n9Z/I
import org.hibernate.Criteria; *vc=>AEc
import org.hibernate.HibernateException; 0,)B~|+
import org.hibernate.Session; W{O:j
import org.hibernate.criterion.DetachedCriteria; 8J{I6nPF
import org.hibernate.criterion.Projections; e48`cX\E
import YLmzMD>
u
'DM?mV:-
org.springframework.orm.hibernate3.HibernateCallback; ] as_7
import -ZFeE[Z
5JW+&XA
org.springframework.orm.hibernate3.support.HibernateDaoS dya]^L}fL
T=35?
upport; }ddwL
xoF]r$sC8
import com.javaeye.common.util.PaginationSupport; [SgWUP*
#qXE[%
public abstract class AbstractManager extends DnvJx!#R
DE|r~TQ
HibernateDaoSupport { |};]^5s9
@P#uH5U
privateboolean cacheQueries = false; %ANo^~8
&f'\9lO
privateString queryCacheRegion; O( G|fs
-FytkM^]6
publicvoid setCacheQueries(boolean +5H9mk
u
+q}9
cacheQueries){ CnruaN@
this.cacheQueries = cacheQueries; hYMIe]kJ
} n)uvN
I'2:>44>I6
publicvoid setQueryCacheRegion(String 3p{N7/z(
)k01K,%#)
queryCacheRegion){ :LBG6J
this.queryCacheRegion = lS]<~
2|@@xF
queryCacheRegion; f I>>w)5
} G3n* bv
/AV
[g^x2
publicvoid save(finalObject entity){ c|3%0=,`
getHibernateTemplate().save(entity); Hy5_iYP5
} T0s7aw[zm
%^[45e
publicvoid persist(finalObject entity){ sY+U$BYB>
getHibernateTemplate().save(entity); Kdh(vNB>
} }1]/dCv
:bI4HXT3
publicvoid update(finalObject entity){ *6^|i}
getHibernateTemplate().update(entity); 3#huC=zbf
} fL.;-
=MDir$1Z
publicvoid delete(finalObject entity){ zIt-mU
getHibernateTemplate().delete(entity); U^vQr%ha
} #&0)kr66
ZOc1 vj
publicObject load(finalClass entity, fiOc;d8
J01w\#62pQ
finalSerializable id){ 7)$U>|=
return getHibernateTemplate().load J~KWn.
NLFs)6\
(entity, id); GdG1e%y]z
} PxzeN6f
(RG\U[
publicObject get(finalClass entity, s<gZB:~
kK&tB
finalSerializable id){ 7Ipt~K}
return getHibernateTemplate().get E*ybf'
\]GO*]CaV
(entity, id); B!GpD@U
} H `y.jSNi
H+vONg
publicList findAll(finalClass entity){ i$;GEM}tv
return getHibernateTemplate().find("from }qmBn`3R
u8qL?Aj^
" + entity.getName()); _Z+tb]
} pw{3I 2Ix
,/6V ^K
publicList findByNamedQuery(finalString /Y5I0Ko Uw
6~zR(HzV{
namedQuery){ ,\!4A
return getHibernateTemplate w{k8Y?
5,`U3na,
().findByNamedQuery(namedQuery); a(Ka2;M4J
} -cs
4<
J9S9rir&
publicList findByNamedQuery(finalString query, W"S,~y
mj5$ 2J
finalObject parameter){ Ol H{!
return getHibernateTemplate I2kqA5>)j
JbpKstc;
().findByNamedQuery(query, parameter); 6}
"?eW
} 2A|^6#XN'
*6 -;iT8
publicList findByNamedQuery(finalString query, 6la# 0U23
hh<5?1
finalObject[] parameters){ +*'
return getHibernateTemplate 11}sRu/
%AW5\ EX
().findByNamedQuery(query, parameters); mN+~fuh
} j[NA3Vj1P
Je_Hj9#M\d
publicList find(finalString query){ +#8?y
5~q
return getHibernateTemplate().find QwXM<qG*
[M_pf2Y
(query); ! P/ ]o
} !iUdej^tx
b9ysxuUdS
publicList find(finalString query, finalObject MV6%~T
6-va;G9Fc
parameter){ qd{o64;|
return getHibernateTemplate().find pcXY6[#N
#n%?}
(query, parameter); VaC#9Tp2X
} xn)FE4
BF8n: }9U
public PaginationSupport findPageByCriteria @_^QBw0
%Y%+K5;AZ
(final DetachedCriteria detachedCriteria){ :,rD5aOQ
return findPageByCriteria 4 q}1
Nge_ Ks
(detachedCriteria, PaginationSupport.PAGESIZE, 0); WI9'$hB\
} )?~3fb6^
y@]4xLB]
public PaginationSupport findPageByCriteria sN|-V+7&j
zf$&+E-
(final DetachedCriteria detachedCriteria, finalint Hb'fEo r
Pc{D,/EpR
startIndex){ lMAmico
return findPageByCriteria $UW!tg*U&
heoOOP(#
(detachedCriteria, PaginationSupport.PAGESIZE, Q>7#</i\.
$de_>
startIndex); l|O^yNS
} 8=gr F
z:9
public PaginationSupport findPageByCriteria xou7j
l2GMVAca
(final DetachedCriteria detachedCriteria, finalint ]Vhhx`0
ASY
uZ
pageSize, 6CO>Tg:%
finalint startIndex){ /k<*!H]KSg
return(PaginationSupport) 8(ny^]v|
eHK}U+"\
getHibernateTemplate().execute(new HibernateCallback(){ A}C&WT~
publicObject doInHibernate Uy^Hh4|
AKx\U?ei7
(Session session)throws HibernateException { dgd&ymRm
:
Criteria criteria = {l{p
?I}jsm1)
detachedCriteria.getExecutableCriteria(session); s=#IoNh
int totalCount = qM3^)U2
%_u*5,w
((Integer) criteria.setProjection(Projections.rowCount :i0xer
RyD2LAf)J
()).uniqueResult()).intValue(); G+4a%?JH
criteria.setProjection R4!qm0Cd
O/_}O_rR
(null); Dn$zwksSs
List items = 1pXAPTV
OQ#gQ6;?0
criteria.setFirstResult(startIndex).setMaxResults ~]Mq'
$>'}6?C.
(pageSize).list(); mhJ>5z
PaginationSupport ps = @A!Ef=R
q9pBS1Ej
new PaginationSupport(items, totalCount, pageSize, %s$_KG !&
pTUsdao^,
startIndex); ,iCd6M{
return ps; o"[P++qd
} L6BHh_*E
}, true); Q !5Tw
} V5KAiG<d
W()FKP\??!
public List findAllByCriteria(final o]n5pZ\\W<
,8o]XFOr
DetachedCriteria detachedCriteria){ ]=9%fA
return(List) getHibernateTemplate q "bpI8j
Bx
E1Ky8@A
().execute(new HibernateCallback(){ I OF~V)8k=
publicObject doInHibernate HG@!J>YaD
'\1%%F7
(Session session)throws HibernateException { Q9K
Gf;
Criteria criteria = gb@Rx
|F<U;xV$p
detachedCriteria.getExecutableCriteria(session); +x
G] (?
return criteria.list(); Ec_
G9&
} la)f\Nk
}, true); \_@u"+,$W
} =%Ut&6}sQ
$f1L<euH
public int getCountByCriteria(final qfC9 {gu
0J$wX yh
DetachedCriteria detachedCriteria){ ""Drf=]
Integer count = (Integer) 1>a^Q
tl ;?/
getHibernateTemplate().execute(new HibernateCallback(){ rZGbU&ZM8
publicObject doInHibernate BOL_kp"
3I:DL#f
(Session session)throws HibernateException { K/Q;]+D
Criteria criteria = &>I8^i
'P@a_*I
detachedCriteria.getExecutableCriteria(session); Uw61X>y=
return sf\;|`}
P_-zkw
criteria.setProjection(Projections.rowCount +hjc~|RK
V$q%=Sip
()).uniqueResult(); 5F^,7A4I0
} NWCnt,FlY
}, true); =AgY8cF!sl
return count.intValue(); ,)]ZD H
} rUlpo|B
} 'U1r}.+b>
D:n0dfPU
wO8^|Yf
OFRzz G@
k%In
JB%6G|Z
用户在web层构造查询条件detachedCriteria,和可选的 7{<F6F^P
mqsf#'ri
startIndex,调用业务bean的相应findByCriteria方法,返回一个 Om}&`AP};
7Fy^K;V"
PaginationSupport的实例ps。 9D<^)ShY
s\7|b:y&
ps.getItems()得到已分页好的结果集 F,:F9r?l,H
ps.getIndexes()得到分页索引的数组 v{% /aw
ps.getTotalCount()得到总结果数 '2# 0UdG
ps.getStartIndex()当前分页索引 =[1W.Zt
ps.getNextIndex()下一页索引 c
|C12b[
ps.getPreviousIndex()上一页索引 KOF! a
}a<MVG:>SF
,nHz~Xi1t
+nJ}+|@K
5V?1/
/%xK-z,V
U#F(#3/
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 *D<sk7
}FM<uBKW
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 <mm}IdH
~Dy0HVE
一下代码重构了。 w-\fCp )
nosEo?{
我把原本我的做法也提供出来供大家讨论吧: 3ZZJYf=
sn Ekei|0
首先,为了实现分页查询,我封装了一个Page类: D^&!
java代码: ;U7\pc;S
TfZO0GL$
n53}79Uiz
/*Created on 2005-4-14*/ DJn>. Gd
package org.flyware.util.page; V 9<[v?.\
7#g C(&\A
/** yY"%6k,ZB
* @author Joa #;mZ3[+i5
* Oi7=z?+j
*/ uO^{+=;A=
publicclass Page { X&p-Ge1>z
fi?[ e?|c@
/** imply if the page has previous page */ %pwm34
privateboolean hasPrePage; MfL q
h
xxV{1, H2
/** imply if the page has next page */ +=}%
7o
privateboolean hasNextPage; e.HN%LrhS
omRd'\ RO
/** the number of every page */ Q?Nzt;)!.
privateint everyPage; (c}0Sg
S[u<vHy
/** the total page number */ )>[(HxvfJU
privateint totalPage; d>AVUf<o~
8\a)}k~4
/** the number of current page */ -8pHjry'q
privateint currentPage; v5 9>
Mys;Il"
/** the begin index of the records by the current
JI*ikco-
F2:7UNy,
query */ A?7%q^;E
privateint beginIndex; NK4ven7/
`r]Cd
{G
{(tE pr
/** The default constructor */ T@RzY2tz
public Page(){ @DUdgPA
)0GnTB;5Z
} O]PfQ
FF_$)%YUp
/** construct the page by everyPage XsR%_eT
* @param everyPage +2?0]6EQ
* */ jOuv\$
public Page(int everyPage){ 4u(}eE
f7
this.everyPage = everyPage; 96PVn
} 1L9^N
pDKJLa
/** The whole constructor */ W*s`1O >
public Page(boolean hasPrePage, boolean hasNextPage, 4]+ ^K`
6F(yH4
IIu3mXAw
int everyPage, int totalPage, FVD}9ia
int currentPage, int beginIndex){ 6?a(@<k_
this.hasPrePage = hasPrePage; (Dn-vY'
this.hasNextPage = hasNextPage; ag+ML1#)
this.everyPage = everyPage; -e)bq:T
this.totalPage = totalPage; nRo`O
this.currentPage = currentPage; e;pNB
this.beginIndex = beginIndex; txgGL'
} DRzpV6s
CTI(Kh+
/** [n}c}%
* @return lZua"Ju
* Returns the beginIndex. c]"B)I1L
*/ %-*vlNC )
publicint getBeginIndex(){ *K98z ?
return beginIndex; tEEhSG)s%
} Ey n3Vv?v
~::R+Lh(
/** fwnpmuJ
* @param beginIndex {&;b0'!Tf
* The beginIndex to set. L.Lt9W2fi
*/ pts}?
publicvoid setBeginIndex(int beginIndex){ cp2fDn
this.beginIndex = beginIndex; d,[KcX
} wYxizNv,
ef.lM]cO
/** )N6R#
* @return p/5!a~1'xN
* Returns the currentPage. zbi
*/ \=_8G:1
publicint getCurrentPage(){ 0Fw\iy1o
return currentPage; ps[6)d)o
} A,og9<+j-
lxmS.C
/** XVLuhwi
* @param currentPage <s2l*mc
* The currentPage to set. = ;a4
Dp
*/ TZP{=v<
publicvoid setCurrentPage(int currentPage){ mQvKreo~
this.currentPage = currentPage; }?~uAU-
} O}`01A!u;
:aqh8bv
/** Dsua13 hF
* @return ZB2'm3'bh
* Returns the everyPage. 3D.S[^s*
*/ }ri*e2y)
publicint getEveryPage(){ 2at?9{b
return everyPage; /j)VES
} g@y"
B6X
$`Xx5Ts7
/** VoyH:
* @param everyPage M"vcF5q
* The everyPage to set. c6uKKh>
*/ u7C{>
publicvoid setEveryPage(int everyPage){ 2%qn!+.
this.everyPage = everyPage; Wu4Nq+
} "[?/I3{E
.apX72's,
/** u20b+c4
* @return _]S6>
* Returns the hasNextPage. Z+dR(9otH3
*/ 5muW*7
publicboolean getHasNextPage(){ Gh|!FRK[$
return hasNextPage; z-gwNE{
} &0eB@8{N
ke#;1
/** w.Vynb
* @param hasNextPage L@_">'pR
* The hasNextPage to set. &+j^{a
*/ (rG1_lUDu
publicvoid setHasNextPage(boolean hasNextPage){ XH *tChf<
this.hasNextPage = hasNextPage; `eWcp^|
} i-FUAR
tN{t-xUgk
/** @NNLzqqY
* @return >h[!gXL^
* Returns the hasPrePage. N
Sh.g#
*/ B
R:
publicboolean getHasPrePage(){ r^E]GDz
return hasPrePage; 4ufLP DH
} &o/4hnHYt
(K6`nWk2
/** @Y<tH,*
* @param hasPrePage uT/B}`md
* The hasPrePage to set. f>5RAg
*/ ZQkw}3*n
publicvoid setHasPrePage(boolean hasPrePage){ z;C=d(|nN
this.hasPrePage = hasPrePage; .lBY"W&{
} mVK 9NK
v|I5Gz$qpa
/** k4$q|x7+%
* @return Returns the totalPage. KY`96~z
* xNm32~
*/ y,&M\3A
publicint getTotalPage(){ hcgc
=$^
return totalPage; p},Fwbl
} yOK])&c
SO<m(o)G2
/** 0Ad~!Y+1
* @param totalPage dn\F!
* The totalPage to set. M91lV(Z
*/ k<| l\]w
publicvoid setTotalPage(int totalPage){ D w=Z_+J
this.totalPage = totalPage; /plUzy2Yu
} iL_F*iK5
@sHw+to|p)
} z>33O5U
+w.Kv
;
_qeuVi=A
VMIX$#
9I\3T6&tr
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 !1'-'Q@f
FMdLkyK;
个PageUtil,负责对Page对象进行构造: %p2x^air
java代码: x"8ey|@&,
5g1M_8e'+
K` ,d$
/*Created on 2005-4-14*/ (bx\4Ws
package org.flyware.util.page; e4Ox`gLa*p
B^_Chj*m
import org.apache.commons.logging.Log; PGPbpl&\t
import org.apache.commons.logging.LogFactory; I26gGp
%Sn 6*\z
/** cN WcNMm
* @author Joa =/g$bZ
* Ydh<T F4!
*/ qX+gG",8
publicclass PageUtil { cvUut^CdK
A3$aMCwKd
privatestaticfinal Log logger = LogFactory.getLog 8F^,8kIR
_ML~c&9jv
(PageUtil.class); \`/E
!ub
+F o$o
/** em1cc,
* Use the origin page to create a new page %L
j0
* @param page %x6Ov\s2
* @param totalRecords 6
r.H8
* @return i6md fp|k
*/ Yxd{&47
publicstatic Page createPage(Page page, int 'dc+M9u)_q
Q*:h/Lhb&
totalRecords){ vV.~76AD5
return createPage(page.getEveryPage(), 6%kJDY.
bqrJP3
page.getCurrentPage(), totalRecords); qggk:cN1
} Dk`4bYK
}@14E-N=
/** ;}WtJ&y=M
* the basic page utils not including exception |[Ie.&)
ZS XRzH~0
handler WY"Y)S
* @param everyPage X&(ERY,h
* @param currentPage #$=8g
RZj
* @param totalRecords l+2cj?X
* @return page 30?LsYXL62
*/ hDljY!P>p
publicstatic Page createPage(int everyPage, int ySQ-!fQnP
fJWxJSdi
currentPage, int totalRecords){ rg5]`-!=
everyPage = getEveryPage(everyPage); R3j#WgltP
currentPage = getCurrentPage(currentPage); :4ja@~
int beginIndex = getBeginIndex(everyPage, [v0ri<