Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 }t0JI3
B)BR
y%
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 |e91KmiqJ
Ns$,.D
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 +ctJV>
w,-4A
o2x
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 VK%
j45D `
J]5ZWo%
。 ke2}@|?t
qoSZ+ khS$
分页支持类: 'iX y?l
iZE7
B7K
java代码: gTk*v0WBm
/Q2HN(Y
V)c.AX5
package com.javaeye.common.util; w"q^8"j!
:_:o%
import java.util.List; E&;;2
XB<Q A>dLh
publicclass PaginationSupport { P=m
l;xp
9)$gD
publicfinalstaticint PAGESIZE = 30; a,eEP43dn
h|.{dv
privateint pageSize = PAGESIZE; !X\aZ{}Q
kd OIL2T
privateList items; N>IkK*v
BeFXC5-qat
privateint totalCount; sMcN[r
U
nS|""
privateint[] indexes = newint[0]; `S|T&|ad0
xTy)qN]P
privateint startIndex = 0; `8kL=%(h
T~~K~a\8
public PaginationSupport(List items, int 3 (F+\4aRm
Q6r7UM
totalCount){ >/'/^h
setPageSize(PAGESIZE); Pv\-D<&@m
setTotalCount(totalCount); oO9yI^
setItems(items); ~H:.&'E
setStartIndex(0); W)Mc$`nX
} :'sMrf_EA
i2!0bY
public PaginationSupport(List items, int q>m[vvt"
gT2k}5d}p
totalCount, int startIndex){ .$ xTX'
setPageSize(PAGESIZE); hw1J <Pl*
setTotalCount(totalCount); l%#z
setItems(items); o`.5NUn
setStartIndex(startIndex); %$F_oO7"
} X<d`!,bn@
[0H]L{yV
public PaginationSupport(List items, int .[o`TlG%
yGC3B00Z
totalCount, int pageSize, int startIndex){ $1n\jN
setPageSize(pageSize); $*C'{&2
setTotalCount(totalCount); yc0_7Im?
setItems(items); WQv`%%G2>
setStartIndex(startIndex); ^-,@D+eW
} Nc*z?0wP
f\~A72-
publicList getItems(){ P9M. J^<
return items; l@g%A#
_
} C~"b-T
Jp(CBCG{F
publicvoid setItems(List items){ MS& 'Nj
this.items = items; Asli<L(?`
} }^azj>p5
]~9YRVeC
publicint getPageSize(){ \vgM`32<
return pageSize; [E0.4FLT!
} R_Uy.0=4
Sz>Lbs
publicvoid setPageSize(int pageSize){ Hli22~7T:
this.pageSize = pageSize; HxNoV.q
} !Aw.)<teW
R T/)<RT9
publicint getTotalCount(){ SA{5A 1
return totalCount; ddw^oU
} !BN@cc[%
(f
publicvoid setTotalCount(int totalCount){ j`%a2
if(totalCount > 0){ |b+CXEzo
this.totalCount = totalCount; WNF#eM?[a
int count = totalCount / s ?|Hw|j
BO'7c1FU
pageSize; 2{4f>,][
if(totalCount % pageSize > 0) 3zzl|+# 6
count++; AL*M`m_
indexes = newint[count]; u_6x{",5I
for(int i = 0; i < count; i++){ Jm,tN/o*
indexes = pageSize * ;Mz7emt
\`-a'u=S
i; :~'R| l
}
ITfz/d8
}else{ ?cB26Zrcb
this.totalCount = 0; 4MP8t@z
} TiD|.a8S
} 9/dADJe0b
e,T^8_>
publicint[] getIndexes(){ qD{~QHDa
return indexes; 4oN*J +"=+
} RAFdo
; - 8]
publicvoid setIndexes(int[] indexes){ $tDM
U3,W
this.indexes = indexes; yw*|
H T
} Y/y`c-VO
z|O3pQn~
publicint getStartIndex(){ yo
:63CPP
return startIndex; F-GH?sfvi
} "6>+IF
6@Ir|o
publicvoid setStartIndex(int startIndex){ m=V69
a#
if(totalCount <= 0) d bHxc@H
this.startIndex = 0; L4v26*P
elseif(startIndex >= totalCount) |};-.}u^`h
this.startIndex = indexes a'?V:3 ]
bCV_jR+
[indexes.length - 1]; bOD]`*q
elseif(startIndex < 0) W('V2Z-q
this.startIndex = 0; #^xj"}o@
else{ ~$m:j];
this.startIndex = indexes l{hO"fzy
^IO\J{U{"x
[startIndex / pageSize]; EC7)M}H
} }B&+KO)
} D(#6H~QN%
#M|q}jA|
publicint getNextIndex(){ K,dEa<p
int nextIndex = getStartIndex() + G x{G}9
/]9(InM9/
pageSize; ? s[!JeUA
if(nextIndex >= totalCount) rbI 7
3'
return getStartIndex(); (BIg
else -?vVV@W-O^
return nextIndex; wLy:S .r
} ];\XA;aOl}
r;GAQH}j_
publicint getPreviousIndex(){ #&ayWef
int previousIndex = getStartIndex() - iO 7s zi
CRu {Ie5B
pageSize; %:\GYs(Y
if(previousIndex < 0) A}_0iwG
return0; nf,Ez
else ;Hn>Ew
return previousIndex; QI`&N(n
} v;d3uunqv
d^I:{Ii'
} ),5A&qT*
a|Wrc)UR
t(xe*xS
[@/s! i @
抽象业务类 e)aH7Jj#
java代码: {~ 1
~V
5W(`lgVs,
/}nq?Vf
/** ]fJ9.Js
* Created on 2005-7-12 vGchKN~_
*/ l f_q6y
package com.javaeye.common.business; q>[}JtXK
(Ji=fh+
import java.io.Serializable; zA8Tp8(
import java.util.List; :Jo[bm
N'YQ6U
import org.hibernate.Criteria; `:
9n
]xP
import org.hibernate.HibernateException; F{laA YE
import org.hibernate.Session; 90gKGyxF
import org.hibernate.criterion.DetachedCriteria; X 1}U
import org.hibernate.criterion.Projections; wexa\o
import LknV47vd
s"x(i
org.springframework.orm.hibernate3.HibernateCallback; T2 /u7<D-
import /@0
iJr(;Bq
org.springframework.orm.hibernate3.support.HibernateDaoS oo]g=C$n
BKQwF*<V
upport; 8$38>cGY^
L[MAc](me-
import com.javaeye.common.util.PaginationSupport; UH#S |o4
n_4BNOZ~
public abstract class AbstractManager extends 7x.]
9J
UD_8#DO{m1
HibernateDaoSupport { 6k;>:[p
2tZ\/6G<
privateboolean cacheQueries = false; [S?`OF12
Og?P5&C"9D
privateString queryCacheRegion; fnK H<
Nl9}*3r
publicvoid setCacheQueries(boolean PKYm{wO-
U%KsD 4B
cacheQueries){ fDwqu.K
this.cacheQueries = cacheQueries; YZz8xtM<2
} !jRs5{n^Ol
[>|6qY$D
publicvoid setQueryCacheRegion(String Zz! yv(e)H
spTIhZ
queryCacheRegion){ 6&,9=(:J&R
this.queryCacheRegion = ~>rnq7j
;ApldoMi
queryCacheRegion; p)s*Cw
} DS0:^TLI
9a]h;r8,9z
publicvoid save(finalObject entity){ O[z-K K<
getHibernateTemplate().save(entity); 3#Xv))w1
} #ib?6=sPC
cCq mrjUmV
publicvoid persist(finalObject entity){ As(6E}{S
getHibernateTemplate().save(entity); G<`6S5J>hr
} 2bxW`.fa
hlFvm$P`M
publicvoid update(finalObject entity){ 2E@g#:3
getHibernateTemplate().update(entity); ;qaNIOo9
} J['i
+4V"&S|&
publicvoid delete(finalObject entity){ c? >;UzM
getHibernateTemplate().delete(entity); )No> Q :t
} 7|X.E
4']eJ==OH
publicObject load(finalClass entity, 7&1dr
l42tTD8Awz
finalSerializable id){ ,b74m
return getHibernateTemplate().load YeB)]$'?u`
/,JL \b
(entity, id); `\Te,
} d#:7V%]dp
{r_x\VC=p
publicObject get(finalClass entity, :Kk+wp}f#
$pj;CoPm
finalSerializable id){ 53l !$#o
return getHibernateTemplate().get I04c7cDp
6gB;m$:fV
(entity, id); U^&y*gX1
} '(SqHP|8&g
\{a 64
publicList findAll(finalClass entity){ )uy2,`z
return getHibernateTemplate().find("from y@Ak_]{b
0t -=*7w%
" + entity.getName()); #*
Iyvx
} )J1xO^tE
0>U7]wZKc
publicList findByNamedQuery(finalString 'J_6SD
:F
pt>g
namedQuery){ ah15,<j
return getHibernateTemplate 1U8/.x|
1a'0cSH
().findByNamedQuery(namedQuery); 2I0Zr;\f
} @c;:D`\p1C
a+P^?N
publicList findByNamedQuery(finalString query, M`,`2I A
Pk)H(,
finalObject parameter){ 077 wk
return getHibernateTemplate ~)
vz`bD1
7t|011<
().findByNamedQuery(query, parameter); $uYfy<
} 0[7tJbN
!^qpV7./l
publicList findByNamedQuery(finalString query, lnt}l
#BhcW"@
finalObject[] parameters){ U]
av{}U
return getHibernateTemplate M6z$*?<
SAokW,
().findByNamedQuery(query, parameters); SH;:bLk_
} EsjZ;D,c(
#~`d
;MC
publicList find(finalString query){ ejlau#8"
return getHibernateTemplate().find ~~{+?v6B]
z{A~d
(query); %VwkYAgA
} 6:AZZF1
O.$OLK;v
publicList find(finalString query, finalObject y1kI^B
9bu1Ax1M
parameter){ pRFlmg@/}
return getHibernateTemplate().find Io]KlR@!T
qw}.
QwPT
(query, parameter); !]=S A &
} =4LyE6
[*^rH:
public PaginationSupport findPageByCriteria :KBy(}V
(dAE
(final DetachedCriteria detachedCriteria){ rz.`$
return findPageByCriteria ;!pJ%p0Sc
uX~YDy
(detachedCriteria, PaginationSupport.PAGESIZE, 0); pU[5f5_
} oU)3du
l'kVi
public PaginationSupport findPageByCriteria YguY5z
T!QAcO
(final DetachedCriteria detachedCriteria, finalint {i/7Nx
ant#bDb/
startIndex){ d% Nx/DS)
return findPageByCriteria i} ?\K>BWq
lcEUK
(detachedCriteria, PaginationSupport.PAGESIZE, 7 MG<!U
4[n[Ch=lu
startIndex); betTAbF
} %(izKJl q
KqFiS9 N5
public PaginationSupport findPageByCriteria i#(+Kxr]>
`2@f=$B
(final DetachedCriteria detachedCriteria, finalint c[;=7-+
o~ReeZ7)Zg
pageSize, &f<Ltdw
finalint startIndex){ &-p!Lg&D
return(PaginationSupport) `l+9g"q
.'=-@W*
getHibernateTemplate().execute(new HibernateCallback(){ \Vl)q>K_h
publicObject doInHibernate 17yg ~
"rR$2`v"
(Session session)throws HibernateException { BD&AtOj[,
Criteria criteria = Fz^5cxmw
x)-n[Fu
detachedCriteria.getExecutableCriteria(session); 8QN/D\uq
int totalCount = i?|b:lcV
=[IKwmCX
((Integer) criteria.setProjection(Projections.rowCount -'RD%_
V*1-wg5>
()).uniqueResult()).intValue(); ]h}O&K/
criteria.setProjection hpzDQ6-Y
2 D!$x+|
(null); Vl0Y'@{
List items = qHC/)M#L
!&5B&w{u~!
criteria.setFirstResult(startIndex).setMaxResults Jb]22]
Wo<kKkx2
(pageSize).list(); :0(:}V3 z\
PaginationSupport ps = CC XOxd
;-!O+c
new PaginationSupport(items, totalCount, pageSize, )C%S`d<%,
tq2TiXo%
startIndex); -59;Zn/
return ps; !-s 6B
} >(eR0.x
}, true); [_zoJ
} q]OgT4ly
8t1,_,2'
public List findAllByCriteria(final 9~yp=JOV@
a\Dw*h?b~
DetachedCriteria detachedCriteria){ 0m'tPFQ|
return(List) getHibernateTemplate bh UghHT
;#S4$wISw`
().execute(new HibernateCallback(){ <k7q9"\4
publicObject doInHibernate LGPg\g`
HOlMj!.
(Session session)throws HibernateException { 4nGr?%>
Criteria criteria = zH1ChgF=}
95oh}c
detachedCriteria.getExecutableCriteria(session); #4ii!ev
return criteria.list(); Y\{&chuF
} *","u;&
}, true); @po|07
} m'5rzZP
jjJ l\Vn
public int getCountByCriteria(final A3zO&4f
]
7K &j
DetachedCriteria detachedCriteria){ -0Q^k\X-
Integer count = (Integer) eLyaTOZadu
rI4N3d;C
getHibernateTemplate().execute(new HibernateCallback(){ L+TM3*a*
publicObject doInHibernate zq4)Uab*
[C( >e0r
(Session session)throws HibernateException { r+;AE N48
Criteria criteria = Rb_+C
HD9+4~8
detachedCriteria.getExecutableCriteria(session); Wup%.yT~Ds
return Nzel^~
FHbw&
criteria.setProjection(Projections.rowCount }ygxmb^@Z
I=o/1:[-
()).uniqueResult(); L6"?p-:@'
} <"
F|K!Tz
}, true); Ol1P
return count.intValue(); >}>cJh6
} LOlj8T8Z
} >;OwBzB
pQOT\- bD
(S
k+nD
_-bEnF+/0
jGKas I`
6'QlC+E
用户在web层构造查询条件detachedCriteria,和可选的 #;9n_)
\_PD@A9
startIndex,调用业务bean的相应findByCriteria方法,返回一个 &g\?znF]H
=%$BFg1a(
PaginationSupport的实例ps。 r[y3@SE5
oM)4""|
ps.getItems()得到已分页好的结果集 ICXz(?a
ps.getIndexes()得到分页索引的数组 3(R]QO`%'
ps.getTotalCount()得到总结果数
"xY]&
ps.getStartIndex()当前分页索引 Ikj_
0/%F
ps.getNextIndex()下一页索引 g'{hp:
ps.getPreviousIndex()上一页索引 h?`'%m?_b
<%Afa#
Nlfz'_0M
L'$;;eM4
rH5'+x K
CHNIL^B
</7_T<He.
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ^ G@o} Z
LwS>jNJx
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 M>"J5yqR
8n Oent0a
一下代码重构了。 {\zB'SNq
9Z;"9$+M
我把原本我的做法也提供出来供大家讨论吧: M8iI e:{ c
Aq"<#:
首先,为了实现分页查询,我封装了一个Page类: 30nR2mB
Kt
java代码: wf=M|
#}_
;,F:.<P
CXfPC[o
/*Created on 2005-4-14*/ 3QO*1P@q
package org.flyware.util.page; ql
c{k/
u
f+j-M|A
/** (DrDWD4_
* @author Joa ~q05xy8
* /E0/)@pDq
*/ <zE~N~;
publicclass Page { C'Z6l^{>
X6lUFko
/** imply if the page has previous page */ Z=\wI:TY1
privateboolean hasPrePage; @8qo(7<~Q
@F,8M
/** imply if the page has next page */ gg%9EJpP
privateboolean hasNextPage; 'Xw>?[BB
sQ8_j
/** the number of every page */ +p#Q|o'
privateint everyPage; l4`HuNR1
FW7@7cVoF
/** the total page number */ lL{1wCsl
privateint totalPage; O9(6 ?n
!K319 eE
/** the number of current page */ zM*PN|/%sH
privateint currentPage; CH3bpZv
h|S6LgB
/** the begin index of the records by the current _/
Uer}
[j^c&}0
query */
%h-?ff[
privateint beginIndex; G0VbW-`O
i!9|R)c
#+]-}v3
/** The default constructor */ 9#A&Qvyywg
public Page(){ 4x%R4tk
|37y ="
} bTN0 n
m? #J`?E
/** construct the page by everyPage ?IHa>f:
* @param everyPage MY `V0
* */ JK@"
&
public Page(int everyPage){ <.qhW^>X
this.everyPage = everyPage; R"
'=^
} 7y2-8eL
z3X:.%
/** The whole constructor */ ^~:&/ 0
public Page(boolean hasPrePage, boolean hasNextPage,
Y;[#~3CA
#O2e[ E-
!-gjA@Pk
int everyPage, int totalPage, 3A5:D#
int currentPage, int beginIndex){ =$t
this.hasPrePage = hasPrePage; 4RXF.kJ3=
this.hasNextPage = hasNextPage; v)AadtZ0d
this.everyPage = everyPage; $IU|zda8
this.totalPage = totalPage; gcNpA?mC|u
this.currentPage = currentPage; >'GQB
this.beginIndex = beginIndex; 7w]NG`7
} }qhNz0*
1FQ_`wF4
/** auKGm:
* @return NEG&zf
* Returns the beginIndex. CF?TW
*/ ,*Z:a4
publicint getBeginIndex(){ g9F4nExo
return beginIndex; 3S_H hvB
}
[C TR8
OY>0qj
/** 'K0=FPB/@
* @param beginIndex 4M4oI .
* The beginIndex to set. R?K[O
*/ LG
qg0(
publicvoid setBeginIndex(int beginIndex){ Mkc|uiT
this.beginIndex = beginIndex; 9/nS?>11
} S@'yuAe*G
R:LThFx
/** ~wdKO7fs
* @return ?{Gf'Y}y&
* Returns the currentPage. 82bOiN15
*/ `mfN3Q*[c
publicint getCurrentPage(){ %G%D[ i]
return currentPage; $_P*Bk)
} pd1V8PZSG
#*|0WaC
/** KW~fW r8
* @param currentPage vKvT7Zxc
* The currentPage to set. EFYyr f@
*/ 2]f"(X4jp
publicvoid setCurrentPage(int currentPage){ (.DX</f/4
this.currentPage = currentPage; H!+T2<F9R
} w[V71Iej
tbP
;iK'
/** [qEd`8V(
* @return h5.>};"@'
* Returns the everyPage. %+y92'GqG/
*/ N))G/m3
publicint getEveryPage(){ X+*"FKm S.
return everyPage; z&@Vg`w"
} w u
u0vq`5L
/** 9se,c
* @param everyPage 6*:mc
* The everyPage to set. $M(ZKS3,j
*/ R3dCw:\O+Z
publicvoid setEveryPage(int everyPage){ %HNe"7gk
this.everyPage = everyPage; 6_w;dnVA
} FLI0C
)Z2l*fV
/** dgIEc]#pH
* @return ?+WSYg0
* Returns the hasNextPage. BP7&wd
*/ y,`SLgBID
publicboolean getHasNextPage(){ 3]iBX`Ni
return hasNextPage; !PFc)J
} k7\h- yn{
^q uv`d
/** UUF;Q0X
* @param hasNextPage iw$n*1M
* The hasNextPage to set. ;6?VkF
*/ \R0&*cnmo
publicvoid setHasNextPage(boolean hasNextPage){ a_pNFe
this.hasNextPage = hasNextPage; \2K_"5
} BZP~m=kq
m'Thm{Y,?n
/** gUcG#
* @return f[bx|6
* Returns the hasPrePage. jo-qP4w
*/ !P6\-.
publicboolean getHasPrePage(){ n;eK2+}]
return hasPrePage; *)2&gQ&%+
} wd/"! A4(
l9%oKJ;
/** SRixT+E
* @param hasPrePage #hOAG_a,
* The hasPrePage to set. sKkk+-J4
*/ &4%j
publicvoid setHasPrePage(boolean hasPrePage){ )i;o\UU
this.hasPrePage = hasPrePage; 5Z`9L|3d
} .mse.$TK.^
w<3g1n7R
/** FTihxC?.L
* @return Returns the totalPage. jM E==)Y
* },2mIit(
*/ } h.]sF
publicint getTotalPage(){ fh1rmet&Ts
return totalPage; B^z3u=ll
} d0`5zd@S
pm*6&,
/** +{$NN
* @param totalPage d `z),A=
* The totalPage to set. O=HT3gp&
*/ BtSl%(w
publicvoid setTotalPage(int totalPage){ vq df-i
this.totalPage = totalPage; X"KX_)GZD
} o771q}?&`
bGl5=`
} IXmtjRv5
H'L~8>
)<D(Mb2p|
r&G=}ZMO
} #[MV+D
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 7yU<!p?(
?0Qm
个PageUtil,负责对Page对象进行构造: )1>fQ9
java代码: %CxrXU
S}=euY'i
.H,wdzg)
/*Created on 2005-4-14*/ `XwFH#_
package org.flyware.util.page; %lw!4Z\gg
S
z3@h"
import org.apache.commons.logging.Log; FQbF)K~e
import org.apache.commons.logging.LogFactory; +$eEZ;4
Yxal%
/** xp395ub6
* @author Joa X0=#e54
* ;OlC^\e
*/ !,#42TY*X
publicclass PageUtil { t\hvhcbL
\X=?+|
9
privatestaticfinal Log logger = LogFactory.getLog Z2yZz:.'
"]%.%$
(PageUtil.class); 9tW=9<E
Yy4?|wVl
/** F 8\nAX
* Use the origin page to create a new page /$ 7_*4e
* @param page nyZUf{:
* @param totalRecords [jD.l;jF
* @return 6#/Riu%
*/ L}bS"=B[&W
publicstatic Page createPage(Page page, int ? jywW$
<c[+60p"
totalRecords){ #6[7q6{4
return createPage(page.getEveryPage(), ,&II4;F
!<wM?Q:
page.getCurrentPage(), totalRecords); hhTM-D1Ehs
} V@0Z\&
QMGMXa
/** S
C8r.
* the basic page utils not including exception 7b,5*]oZ
: QK )Ym
handler qwlIz/j
* @param everyPage 7|A9
* @param currentPage FK
MuRy|
* @param totalRecords PYldqY
* @return page T@[(FVA N
*/ OY'490
publicstatic Page createPage(int everyPage, int sLE@Cm]k
*&b~cyC
currentPage, int totalRecords){ aZ%
everyPage = getEveryPage(everyPage); o2cZ
currentPage = getCurrentPage(currentPage); D8otUDB{
int beginIndex = getBeginIndex(everyPage, T@PtO"r
WXqrx*?*+
currentPage); uTNmt]
int totalPage = getTotalPage(everyPage, -5Qsc/s&
f)xHSF"
totalRecords); gDP\u<2!
boolean hasNextPage = hasNextPage(currentPage, <$WRc\}&g