Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 26K~m@
{?hjx+v[
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 4HE4e
X-FHJ4
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
|?A-?-
Ntiz-qW
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 I0RWdOK8K
>K%x44|
。 &}1)]6q$
1_lL?S3,a@
分页支持类: H]X)@n>
A,qG*lv
java代码: G].KJ5,y
3:
Uik
o7zfD94I
package com.javaeye.common.util; nVzo=+Yp
*/E{s?
import java.util.List; a"0~_=
m.1BLN[9
publicclass PaginationSupport { U2$T}/@
4PQWdPv;
publicfinalstaticint PAGESIZE = 30; 2_X0Og8s[
"g-NUl`'
privateint pageSize = PAGESIZE; 9#!tzDOtD
{eUfwPAa3
privateList items; ^dv>n]?
|e&Kg~~C
privateint totalCount; >qA&;M
hgGcUpJy?
privateint[] indexes = newint[0]; %>TdTt
`l#g`~L
privateint startIndex = 0; 8t%1x|!
a0.XJR{T"
public PaginationSupport(List items, int G\%hT5^
4+Y5u4`t
totalCount){ \.]
U
setPageSize(PAGESIZE); HrGX-6`
setTotalCount(totalCount); =Frr#t!(w0
setItems(items); y e'5A
setStartIndex(0); cDg27xOUi
} 46~ug5gV
r$5!KO
public PaginationSupport(List items, int 51x,[y+Xe
:cTi$n
totalCount, int startIndex){ qv\yQ&pj
setPageSize(PAGESIZE); v*3:8Y,
setTotalCount(totalCount); wn`budH?c8
setItems(items); O5
SX"A
setStartIndex(startIndex); ?*,q#ZkA9W
} ^MUM04l
:%{7Q$Xv<
public PaginationSupport(List items, int Kl? 1)u3^4
{NR~>=~K-
totalCount, int pageSize, int startIndex){ 7~'@m(9e
setPageSize(pageSize); G<'S
setTotalCount(totalCount); -eTGRr
setItems(items); JK4 @
setStartIndex(startIndex); CR<l"~X
} 2dfA}i>k
h%%'{^>~
publicList getItems(){ D#0}/
return items; xXZN<<f59
} X*KT=q^?n
|4vk@0L
publicvoid setItems(List items){ P;Ox|
this.items = items; WlUE&=|Oz2
} #Z : r
I /g]9
y
publicint getPageSize(){ 6F2}|c
return pageSize; rQJoaP+\q
} YC~+r8ME$j
F/8y p<_r
publicvoid setPageSize(int pageSize){ J$0*K+m
this.pageSize = pageSize; iYnt:C
} GfDA5v[
8CCA/6
publicint getTotalCount(){ ("Zi,3"+
return totalCount; -IE;5f#e
} r_G`#Z_5F
_
0-YsD
publicvoid setTotalCount(int totalCount){ tBrVg<]t
if(totalCount > 0){ F~EriO
this.totalCount = totalCount; eIJQ|p<v
int count = totalCount / vJ!t.Vou
8Xr"4;}f+
pageSize; C}CX n X
if(totalCount % pageSize > 0) R##O9BSI8Z
count++; y03l_E,
indexes = newint[count]; c!zu0\[Id
for(int i = 0; i < count; i++){ W8)GT`\
indexes = pageSize * f&:g{K
qpZ".
i; 5gGr|d|(
} sMZ \6
}else{ &PbH!]yd
this.totalCount = 0; <javZJ
} Y3?kj@T`i
} %Xn)$Ti~<
N}\i!YUD
publicint[] getIndexes(){ NJ.kT uk
return indexes; <T['J]k%
} Ks4TBi&J
m35G;
publicvoid setIndexes(int[] indexes){ ZP1EO Z
this.indexes = indexes; ws=y*7$y
} Mvux=Ws
H_9~gi
publicint getStartIndex(){ tZJKB1#WbP
return startIndex; sB $!X@
} !*p lK6a
:H~r
_>E
publicvoid setStartIndex(int startIndex){ !)GPI?{^5
if(totalCount <= 0) DGcd|>q
this.startIndex = 0; Y #\e~>K
elseif(startIndex >= totalCount) bbz86]AhY
this.startIndex = indexes OnG?@sW+4!
LTxOq|/Cq
[indexes.length - 1]; 8 _>R 'u[
elseif(startIndex < 0) 5QlJX
this.startIndex = 0; grZN.zTO
else{ yt?#T#
this.startIndex = indexes X]N8'Yt
h<?Vzl
[startIndex / pageSize]; kHJjdgV
} GE>&fG
} uy$o%NL-7
_$r+*nGDz
publicint getNextIndex(){ d<y
B ~Y
int nextIndex = getStartIndex() + fSj^/>
3 Tt8#B
pageSize; k7j;'6
if(nextIndex >= totalCount) 56fcifXz@
return getStartIndex(); >d=k-d
else !+i
return nextIndex; {9(N?\S1`a
} o^Ms(?K%t
E5B:79BGO
publicint getPreviousIndex(){ W)KV"A3C
int previousIndex = getStartIndex() - 'INdZ8j_
xk#/J]j
pageSize; kc}e},k
if(previousIndex < 0) VP[ J#TPU
return0; zzM 'uo
else /MA4Er r
return previousIndex; .2`S07Z
} s+aeP
;:v:pg8qc
} d35 ,[
%GJ,&b|
?]:3`;h3
By"
=]|Q
抽象业务类 }_K7}] 1
java代码: JD.WH|sZ5
?>2k>~xlQ
hW(Mf
/** m!g
f!
* Created on 2005-7-12 lOql(ZH`w
*/ Y6+nfh_
package com.javaeye.common.business; hS<+=3
<M
8xLvpgcZ
import java.io.Serializable; leiP/D6s
import java.util.List; <}G7#xg
`w2hJP
import org.hibernate.Criteria; 90;[5c
import org.hibernate.HibernateException; }.x?$C+\"
import org.hibernate.Session; A%pcPzG;
import org.hibernate.criterion.DetachedCriteria; TeQpmhN
import org.hibernate.criterion.Projections; geua8;
import ^MuO;<<,.
H.*XoktC]
org.springframework.orm.hibernate3.HibernateCallback; _E3*;
import *U8Pjb1
(,[Oy6o
org.springframework.orm.hibernate3.support.HibernateDaoS sk9*3d5I
LEG
y1L
upport; ;:f.a(~c
JW
(.,Ztm
import com.javaeye.common.util.PaginationSupport; fs\l*nBig
g$~ktr+%
public abstract class AbstractManager extends LyH{{+V
\It8+^d@
HibernateDaoSupport { F8f@^LVM/
@a+1Ri`)
privateboolean cacheQueries = false; +g%kr~w=
Pr9$(6MX
privateString queryCacheRegion; Iell`;
K%O%#Kk
publicvoid setCacheQueries(boolean A?=g!( wB
Ng2qu!F7
cacheQueries){ e+j7dmGa
this.cacheQueries = cacheQueries; .hXxh)F
} QYPsqkF*
Ap=LlZ
publicvoid setQueryCacheRegion(String uD_iyK0,
"1t%J7c_
queryCacheRegion){ m!V ?xGKJ
this.queryCacheRegion = d[J+):aW
xh,};TS(K
queryCacheRegion; >T=($:n
} vdV@G`)HPr
gh#9<
publicvoid save(finalObject entity){ xx_]e4
getHibernateTemplate().save(entity); g ?qm >X
} 1ve
%xF
HTAJn_
publicvoid persist(finalObject entity){ e<#t]V
getHibernateTemplate().save(entity); 9 "7(Jq
} )[i0~o[
W$=Ad *
publicvoid update(finalObject entity){ 8HDYA$L
getHibernateTemplate().update(entity); (
$A0b
} }KcvNK (
\9N1:
publicvoid delete(finalObject entity){ Z_Qs^e$
getHibernateTemplate().delete(entity); FWNWOU
} 07`hQn)Gc
8>%:MS"
publicObject load(finalClass entity, f%<kcM2
OrNi<TY>
finalSerializable id){ E<y0;l?H<
return getHibernateTemplate().load c 2t<WRG
`7[z%cuK
(entity, id); @i U@JE`C
} cks53/Z
5)bf$?d
publicObject get(finalClass entity, *mwHuGbZed
0]p!
Bscaf
finalSerializable id){ e)"]H*
return getHibernateTemplate().get noJ5h|
6aRPm%
(entity, id); o."k7fLB
} 1j"_@?H[
3D|Y4OM
publicList findAll(finalClass entity){ _$g6Mj]1z
return getHibernateTemplate().find("from iZm#
"}VG
4LO4SYW7
" + entity.getName()); O|wu;1pQ
} )IQ5Qu
bS7rG$n [
publicList findByNamedQuery(finalString >ka*-8?
4IfOvAN%
namedQuery){ RrB)u?
return getHibernateTemplate e1ts/@V
DO6Tz-%o
().findByNamedQuery(namedQuery); :4Jq T|nS
} DD5S
R
,t?c=u\5
publicList findByNamedQuery(finalString query, ;J[ed>v;3
Lxz!>JO>
finalObject parameter){ z 3((L
return getHibernateTemplate k%2woHSu&
dZ^(e0& :H
().findByNamedQuery(query, parameter); 2yB)2n#ut
} 1V?)T
rF n%e
publicList findByNamedQuery(finalString query, Z8mSm[w
DNTkv_S
finalObject[] parameters){ pAK7V;sJ
return getHibernateTemplate $U. >]i
9rD6."G
().findByNamedQuery(query, parameters); 3X|7 R
} j:k}6]p}
5~8FZ-x
publicList find(finalString query){ <=O/_Iu(
return getHibernateTemplate().find sVzU>
MX*T.TG8
(query); 0'm$hU}
} o}^/Km+t
@bfW-\ I
publicList find(finalString query, finalObject R{6~7<m.
Ei$?]~
&
parameter){ $4YyZ!_.@
return getHibernateTemplate().find _T\/kJ)Q\
^v2-"mX<
(query, parameter); AlPk o($E*
} y&A0}>a:d
oY
NIJXln
public PaginationSupport findPageByCriteria }253Q!f
g<b(q|
(final DetachedCriteria detachedCriteria){ [- Xz:
return findPageByCriteria _Fc :<Ym?
=@ SJyW
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 8)KA {gN}
} BIJlU(aF
3$ 'eDa[
public PaginationSupport findPageByCriteria <xn96|$
8,VX%CS#q
(final DetachedCriteria detachedCriteria, finalint (v/mKG yg
&Hl*Eg
f
startIndex){ yW@0Q:
return findPageByCriteria 5Yxs_t4
&PE/\_xD_
(detachedCriteria, PaginationSupport.PAGESIZE, NI<;L m
&<Iyb}tA?
startIndex); `qXCY^BH2
} E\$7tXQK6
ox|K2A
public PaginationSupport findPageByCriteria `S)*(s?T
sLHUQ(S!
(final DetachedCriteria detachedCriteria, finalint (Ci{fY6`
!<EQVqj6
pageSize, pwIu;:O!?
finalint startIndex){ UgqfO(
return(PaginationSupport) QXaE2}}P
th
:I31
getHibernateTemplate().execute(new HibernateCallback(){ n7A %y2
publicObject doInHibernate 'nx";[6(
Q|$?d4La8
(Session session)throws HibernateException { t%k1=Ow5i
Criteria criteria = %@q/OVnM
M94zlW<
detachedCriteria.getExecutableCriteria(session); 3QZ~t#,7ij
int totalCount = O>vbAIu
tMy<MO)Ei
((Integer) criteria.setProjection(Projections.rowCount U07G&?/
tJ qd
()).uniqueResult()).intValue(); AiDV4lHr
criteria.setProjection J$+K't5BZ
U??T>
(null); =!R+0
List items = arQEi
vG2&qjY1
criteria.setFirstResult(startIndex).setMaxResults :c?}~a~JO(
!kpnBgm U
(pageSize).list(); ^7p>p8
PaginationSupport ps = 3Yb2p!o
ZH
s' #
new PaginationSupport(items, totalCount, pageSize, <T^:`p/]4
I\y=uC
startIndex);
}Ghh%]
return ps; ^q@6((O
} g~/@`Z2Y
}, true); $D%[}[2
} ,suC`)R
s*3p*zf
public List findAllByCriteria(final rn8#nQ>QZ%
sI,S(VWor
DetachedCriteria detachedCriteria){ ;,&$ob*/
return(List) getHibernateTemplate `A0trC3
HLruZyN4
().execute(new HibernateCallback(){ 9) ~Ha iVB
publicObject doInHibernate gX'nFGqud
5 0KB:1(g
(Session session)throws HibernateException { OS{j5o
Criteria criteria = &pk&8_=f
-~HyzX\cZB
detachedCriteria.getExecutableCriteria(session); bMjE@S&
return criteria.list(); ajJ+Jn\
} 5h!ZoB)n
}, true); WF&?OHf2
} n7$21*,
^{l^Z
+b.
public int getCountByCriteria(final
p]^?4
]!mC5Ea
DetachedCriteria detachedCriteria){ +<TnE+>j
Integer count = (Integer) cy%S5Rz
}b$W+/M\
getHibernateTemplate().execute(new HibernateCallback(){ nyRQ/.3
publicObject doInHibernate 2c u?2_,
H}f}Y8J{
(Session session)throws HibernateException { i|/EA7
Criteria criteria = Jmcf9g
"I
n[= 2w
detachedCriteria.getExecutableCriteria(session); ;5.S"
return M~SbIk<#a<
z{uRqAG
criteria.setProjection(Projections.rowCount YB?5s`vr9d
]hC6PKJU
()).uniqueResult(); 1 Vq)& N
} pf%B
}, true); loR,f&80=O
return count.intValue(); -V\$oVS0S
} JsY|Fv
} !o{>[
]A]EED.ZH
g/_j"Nn
^:Hx .
KhFw%Z0s<
gOSFvH8FU
用户在web层构造查询条件detachedCriteria,和可选的 2*5]6B-(
*?<ygzX
startIndex,调用业务bean的相应findByCriteria方法,返回一个 qHtonJc
x<lY&KQ0
PaginationSupport的实例ps。 XqxmvN
,+mH1#-3
ps.getItems()得到已分页好的结果集 by0@G"AE+
ps.getIndexes()得到分页索引的数组 kbcqUE
ps.getTotalCount()得到总结果数 mR|;}u;d
ps.getStartIndex()当前分页索引 +/|;<K5_LI
ps.getNextIndex()下一页索引 !\(j[d#
ps.getPreviousIndex()上一页索引 f?[0I\V[$
3;t {V$
WA1h|:Z
w1 5QqhlK
UifuRmn
$sa5aUg }
R{R'byre
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 U1,f$McZs
KbicP<
,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 ,%!E-gr
,fR /C
一下代码重构了。 n5e1ky*9w
t7; ^rk*
我把原本我的做法也提供出来供大家讨论吧: uNoP8U%*
!YZ$WiPl
首先,为了实现分页查询,我封装了一个Page类: WNo",Vc
java代码: L?:fyNA3[
`rQDX<?
)o[Jxu'
/*Created on 2005-4-14*/ gK
Uci
package org.flyware.util.page; =e j'5m($3
/'<Qk'
/** S9@2-Oc
* @author Joa 6vL+qOd x
* CG397Y^
*/ ]\ DIJ>JZ
publicclass Page { M>m+VsJV
fx#Krr@
/** imply if the page has previous page */ 3`%U)gCT5
privateboolean hasPrePage; H-ewO8@
<JkmJ/X
/** imply if the page has next page */ E2%{?o
privateboolean hasNextPage; sQ05wAv
_W +
/** the number of every page */ pGHn
privateint everyPage; 6M-Y`T`J
[:Y`^iR.
/** the total page number */ \[MQJX,dn
privateint totalPage; Y[p
YVT\@+C'
/** the number of current page */ f0Zn31c^
privateint currentPage; 66jL2XU<
{DVu* %|
/** the begin index of the records by the current CgxGvM4
^\Gukkmh}
query */ cE SSSH!m
privateint beginIndex; SGK=WLGM8
){S/h<4m
-!JnyD
/** The default constructor */ f;Uf=.#F
public Page(){ =,WW#tD
T>e4Og"?
} =xX)2h
FXd><#U
/** construct the page by everyPage #\LsM
~,
* @param everyPage #lo1GoL\
* */ lemE/(`a_
public Page(int everyPage){ ~SD8#;v2
this.everyPage = everyPage; |',$5!:0O
} hDAxX=FM
!hS~\+E
/** The whole constructor */ `fm^#Nw
public Page(boolean hasPrePage, boolean hasNextPage, u?-X07_
PY{])z3N
!b:;O
+[
int everyPage, int totalPage, <-avC/M$d
int currentPage, int beginIndex){ h|OsT
this.hasPrePage = hasPrePage; v5Qp[O_
this.hasNextPage = hasNextPage; #G`UR
this.everyPage = everyPage; b,MzHx=im
this.totalPage = totalPage; z&@O\>Q
this.currentPage = currentPage; "T0s7LWp
this.beginIndex = beginIndex; ~o?(O1QY
} a3?D@@Qnw
8e{S(FZ7Ed
/** 8IrA{UU
* @return b0n " J`
* Returns the beginIndex. %M
KZ':m
*/ I%qZMoS1h
publicint getBeginIndex(){ XA4miQn&
return beginIndex; CUG3C
} -w#*~Q{'*
8n`O{8:fi
/** ;(1Xb
* @param beginIndex fO'"UI
* The beginIndex to set. PW)Gd +y
*/ +`D,7"{Eu
publicvoid setBeginIndex(int beginIndex){ hJsYKd8g
this.beginIndex = beginIndex; vD@=V#T
} L%sskV(
D<SLv,Y
/** CQGq}.Jt!
* @return Q`* v|Lp
* Returns the currentPage. U 4Sxr
*/ b!hs|emo;
publicint getCurrentPage(){ {6, l#z
return currentPage; i=mk#.j~
} WPnw
ay-M.J
/** Rz\:)<G
* @param currentPage {~u#.(
* The currentPage to set. 0%f}w0]:
*/ |'?./
publicvoid setCurrentPage(int currentPage){ F\lnG
this.currentPage = currentPage; Yfotq9.=+
} gZ b+m
:<w2j6V
/** LLlt9(^d
* @return }>T$2"pf
* Returns the everyPage. 5UU1HC;C
*/ YA,vT[kX
publicint getEveryPage(){ F{;{o^Pv
return everyPage; X4z6#S58
} XoZPz
GiH<