Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 >M`CVUf
;LMJd@
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 bLwAXW2K+
iB498t
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 3J5!oF{H
'JRvP!]
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 `tn{ei
D8xmE2%
。 1 A\OC
H(Z88.OM
分页支持类: MerFZd 1
Gy6l<:;
java代码: } x2DT8u
fc
|GArL#}
aL&n[
package com.javaeye.common.util; o:_Xv.HRZo
_iir<}
import java.util.List; zlEX+=3
j!7{|EQFcl
publicclass PaginationSupport { t$De/Uq
ayfFVTy1d
publicfinalstaticint PAGESIZE = 30; &8vCZN^
< Pky9o;
privateint pageSize = PAGESIZE; iy%ZQ[Un
dfij|>:*0
privateList items; `a2n:F
J{k79v
privateint totalCount; o*o/q],C9-
GhIKvX_N
privateint[] indexes = newint[0]; ; ShJi
28UU60
privateint startIndex = 0; H kQ)n3
/so8WRu.
public PaginationSupport(List items, int (G[
*|6m
TZY3tUx0|G
totalCount){ {qN 5MsY
setPageSize(PAGESIZE); %'X[^W
setTotalCount(totalCount); 6x%h6<#xh*
setItems(items); |\7
ET[Xq
setStartIndex(0); :>Ay^{vf=
} L2[f]J%
SN1}xR$
public PaginationSupport(List items, int n\^Tq<] a
`.i!NBA'6
totalCount, int startIndex){
.p e( lP
setPageSize(PAGESIZE); `|ASx8_!
setTotalCount(totalCount); 1*@'-mj
setItems(items); "C I=`=
setStartIndex(startIndex); !0vG|C;'
} eep1I
:N
opc/e
public PaginationSupport(List items, int ~NpA".PB
[O?z@)dx
totalCount, int pageSize, int startIndex){ 5nKj
)RH7M
setPageSize(pageSize); R5X.^u
setTotalCount(totalCount); BEre*J
setItems(items); 1f":HnLRM
setStartIndex(startIndex); &3n~%$#N
} }<9cL'
sXD1C2o
publicList getItems(){ '*"vkgN
return items; n}!PO[m~
} K|:@Z
V{:A3C41
publicvoid setItems(List items){ V4KMOYqm
this.items = items; _s .G
} SV~cJ]F
.K p
publicint getPageSize(){ Fd[zDz
return pageSize; E: $P=%b
} d\jPdA.a=
B(n{e53 9f
publicvoid setPageSize(int pageSize){ JNJ=e,O,
this.pageSize = pageSize; }wHW7SJ
} Na?!;1]_
IHcD*zQ
publicint getTotalCount(){ &QGdLXOn
return totalCount; Y}#J4i0b*
} tavpq.0O
P dhEQ}H
publicvoid setTotalCount(int totalCount){ :[hgxJu+
if(totalCount > 0){ D0%Ug>
this.totalCount = totalCount; WYEKf9}
int count = totalCount / K0}pi+=
>U]C/P[+
pageSize; M>i9 i-dU
if(totalCount % pageSize > 0) enSXP~9w
count++; q&W[j5E
indexes = newint[count]; w(/aiV
for(int i = 0; i < count; i++){ Q2F+?w;,
indexes = pageSize * Ipq"E
s3R(vd
i; TiO"xMX
} n1VaLD
}else{ nysUZB
this.totalCount = 0; O"c;|zCc>
} b;cdIl!3
} Z`KC%!8K
<F`>,Pm
publicint[] getIndexes(){ &'}RrW-s
return indexes; fM^qQM[lG
} D-4f >
o8-^cP1
publicvoid setIndexes(int[] indexes){ F=a<~EpZ
this.indexes = indexes; _PlKhv}
} Ft;^g3N
cxr=k%~}J
publicint getStartIndex(){ Gr^E+#;
return startIndex;
.5y+fL
} {O`w,dMOI
4bn(zyP
publicvoid setStartIndex(int startIndex){ HP3lz,d
if(totalCount <= 0) f^"N!f a
this.startIndex = 0; 0QOBL'{7)
elseif(startIndex >= totalCount) v4.#;F.\m
this.startIndex = indexes 6Qy@UfB
j&Wl0
[indexes.length - 1]; 5&q8g;XiEM
elseif(startIndex < 0) Ou1JIxZ)|
this.startIndex = 0; ek}a}.3 {
else{ =MLcm^b
this.startIndex = indexes yRfSJbzaf\
^WNrGF
[startIndex / pageSize]; @p NNq
} HAJ 7m!P
} Wv/%^3
~(IB0=A{v
publicint getNextIndex(){ tGl;@V@Qj
int nextIndex = getStartIndex() + rjP L+T_
vc+A RgvH+
pageSize; 6N;wqn
if(nextIndex >= totalCount) n_(/JE>
return getStartIndex(); T<w5vqFDu
else 3T}izG]
return nextIndex; ZO)S`W
} f'aVV!
=<X?sj5
publicint getPreviousIndex(){ H+ 0$tHi
int previousIndex = getStartIndex() - -!N&OZ+R
NCk r /#!
pageSize; /s[l-1zW
if(previousIndex < 0) Q'YH>oGh^
return0; 8$ma;U d
else ]jaQ[g$F
return previousIndex; cnFI
&,FM
} \7l-@6'7
IS#FiH
} v{jQek4
,>eMG=C; g
>9(hUH
8rMX9qTO@
抽象业务类 1I<rXY(a`
java代码: $ n+w$CI)
-"h;uDz|z
E gal4
/** vpld*TL*
* Created on 2005-7-12 )6Ny1x+
*/ `>?ra-
package com.javaeye.common.business; b r^_'1
sM?MLB\Za
import java.io.Serializable; '6xQT-sUih
import java.util.List; 6C]1Q.f;
zSSB>D
import org.hibernate.Criteria; N\#MwLm
import org.hibernate.HibernateException; YR>B_,Gl
import org.hibernate.Session; z[cyA.
import org.hibernate.criterion.DetachedCriteria; f"9q^
import org.hibernate.criterion.Projections; USVqB\#
import (A?H1 9
)Lwc
org.springframework.orm.hibernate3.HibernateCallback; N^pJS6cJkl
import $P(v{W)
gOr%!QaF
org.springframework.orm.hibernate3.support.HibernateDaoS eOXHQjuj
%c
[F;ug
upport; 2Ri{bWi
( @3\`\X
import com.javaeye.common.util.PaginationSupport; j8fpj {hp
` bdZ/*E
public abstract class AbstractManager extends "bm
~5 *5
HibernateDaoSupport { _`I"0.B]
QR
Ei7@t
privateboolean cacheQueries = false; 1XnZy5fEo
>2Jdq
privateString queryCacheRegion; W3;#fa:[L
&3$z4df
publicvoid setCacheQueries(boolean _x?uU
s.x&LG
cacheQueries){ ^.hoLwp.
this.cacheQueries = cacheQueries; 3Ezy %7
} sPps q
8Y_ol#\L
publicvoid setQueryCacheRegion(String H.WE6
]\xy\\b/`
queryCacheRegion){ 2OwV^-OG
this.queryCacheRegion = qKE:3g35
]b= P=
queryCacheRegion; .p=sBLp8
} m@Qt.4m%g
GHHav12][
publicvoid save(finalObject entity){ +Ag!?T
getHibernateTemplate().save(entity); V~hlq$jn<Y
}
WJ
d%2pO]
h[?O+Z^
publicvoid persist(finalObject entity){ V %_4%
getHibernateTemplate().save(entity); %rF?dvb;?
} "n: %E
E^rbcGJ
publicvoid update(finalObject entity){ A)~X,
getHibernateTemplate().update(entity); LS5vW|]w
} k $fGom
F! X}(N?t
publicvoid delete(finalObject entity){ =1u@7Bh
getHibernateTemplate().delete(entity); \y88d4zX
} (__yh^h:m
^47PLLRP
publicObject load(finalClass entity, d @*GUmJ
Khe!g1=&X
finalSerializable id){ [J
C:
return getHibernateTemplate().load 90#
;?#
/\w)>0
(entity, id); LT~YFS
} qA:#iJ8w
$%%os6y2v
publicObject get(finalClass entity, 2o9$4{}rG
1N\D5g3
finalSerializable id){ Rm5Kkzd0o
return getHibernateTemplate().get .p ls!
WnHUE
(entity, id); {0@&OO:w
} `Bw9O%]-S
1TM~*<Jb
publicList findAll(finalClass entity){ Ka|eFprS
return getHibernateTemplate().find("from 0vGyI>
6ATtW+sN ]
" + entity.getName()); #"ftI7=42
} NJ MJ
$LHa?3
publicList findByNamedQuery(finalString tURc bwV
jhGlG-^
namedQuery){ 7Mx6
return getHibernateTemplate $2MAZGJV
ow/57P
().findByNamedQuery(namedQuery); /_\#zC[
} ==H$zmK
/EMJSr
publicList findByNamedQuery(finalString query, F=)&98^v$_
,SScf98,j
finalObject parameter){ $>R(W=Q
return getHibernateTemplate [,~TaP}m
WV"jH9"[
().findByNamedQuery(query, parameter); oA
tsUF+a
} W"Jn(:&
XTeb9h)3
publicList findByNamedQuery(finalString query, ;U`X 6d
J.RAmU <
finalObject[] parameters){ 4.K'\S
return getHibernateTemplate eV6o3u:9
(X6sSO
().findByNamedQuery(query, parameters); ?`zgq>R}w[
} [<wbbvXR
S='syq>Aok
publicList find(finalString query){ @-#T5?
return getHibernateTemplate().find Ze!92g
G_ Ay
(query); vtMJ@!MN;
} AaN"7.Z/
m_!U}!
publicList find(finalString query, finalObject HhkN^S,
n~Szf
parameter){ *C,N'M<u
return getHibernateTemplate().find XNH4==4
~E=\t9r
(query, parameter); D22Lu;E
} )9P&=
s6=YV0w(
public PaginationSupport findPageByCriteria E/za@W
IbWPlbH
(final DetachedCriteria detachedCriteria){ .}9FEn 8
return findPageByCriteria (Q-I8Y8l8
sIm#_+Y
(detachedCriteria, PaginationSupport.PAGESIZE, 0); "A]Y~iQ
} +=8X8<Pu
$Kq<W{H3ut
public PaginationSupport findPageByCriteria A1*4*
cD{8|B*
(final DetachedCriteria detachedCriteria, finalint R I@*O6\/I
wq4nMY:#
startIndex){ eO{@@?/y
return findPageByCriteria Isovwd
v3JPE])/
(detachedCriteria, PaginationSupport.PAGESIZE, {rPk3
C(]'&~}(
startIndex); 3$"/>g/
} Q-R}qy5y
\>)f5 gV@
public PaginationSupport findPageByCriteria w3#`1T`N
F^'v{@C
(final DetachedCriteria detachedCriteria, finalint 3cu9[~K
a{_ KSg
pageSize, {Bvm'lq`
finalint startIndex){ e d;"bb
return(PaginationSupport) :l~E E!
@\~tHJ?hQd
getHibernateTemplate().execute(new HibernateCallback(){ |mj#
0
publicObject doInHibernate \Hs|$
k_Tswf3
(Session session)throws HibernateException { dYyW]nZ&
Criteria criteria = Qcgu`]7}
aFG3tuaKrQ
detachedCriteria.getExecutableCriteria(session); Q>IH``1*e
int totalCount = n4>cERfa
qG^_c;l6a
((Integer) criteria.setProjection(Projections.rowCount Xb+3Xn0}&8
jvO3_Zt9
()).uniqueResult()).intValue(); 3G&0Ciet
criteria.setProjection x(vai1CrdH
fN0bIE
Y
(null); u 6(GM
List items = ;>C9@S+
OT+ Ee
criteria.setFirstResult(startIndex).setMaxResults eKJ:?Lxv;
o4'Wr
(pageSize).list(); hBoP=X.~
PaginationSupport ps = 8{@`kyy|
L"^.0*X/d
new PaginationSupport(items, totalCount, pageSize, gr\@sx?b
3d@ef|
startIndex); {Ve
D@
return ps; 6s5b$x
} +l.|kkZ?
}, true); yXXvs'$R \
} O8$~*NFJf
v\'rXy
public List findAllByCriteria(final I)rGOda{
u/#&0_
P
DetachedCriteria detachedCriteria){ rV~T>x
return(List) getHibernateTemplate K{N%kk%F
f^u^-l
().execute(new HibernateCallback(){ %GS\1 Q%
publicObject doInHibernate ]DU61Z"v?b
\boL`X
(Session session)throws HibernateException { +/w(K,
Criteria criteria = Cv P`2S\
H):-!?:
detachedCriteria.getExecutableCriteria(session); hMz&JJ&B
return criteria.list(); ;{]8>`im&4
} w'|&5cS
}, true); ^A- sS~w
} u2\+?`Ox
*[VEF
public int getCountByCriteria(final @Mzz2&(dU
]u;GNz}?
DetachedCriteria detachedCriteria){ 9E^~#j@Zr
Integer count = (Integer) %
<^[j^j}o
t18UDR{
getHibernateTemplate().execute(new HibernateCallback(){ 6hLNJ
publicObject doInHibernate r7RU"H:j8
xkF$D:sP
(Session session)throws HibernateException { >H)^6sJ;%b
Criteria criteria = m';#R9\Fz
\ibCR~W4
detachedCriteria.getExecutableCriteria(session); 9^(HXH_f
return #>@<n3rq
"$]ls9-%n
criteria.setProjection(Projections.rowCount HgYc@P*b
y#&$f
()).uniqueResult(); ^@ M [t<
} Q^[e/U,
}, true); nG!&u1*
return count.intValue(); hx*HY%\P
} *Ao2j;
} :jBZK=3F>
,Y$F7&
Xg,0 /P~
%)BwE
?]s%(R,B5
&$<(D0
用户在web层构造查询条件detachedCriteria,和可选的 iJ,M-GHK
bK!,Pc<
startIndex,调用业务bean的相应findByCriteria方法,返回一个 +.S#=
1P+Mv^%I
PaginationSupport的实例ps。 d&NCFx
_{lx*dq
ps.getItems()得到已分页好的结果集 67}]s@:l](
ps.getIndexes()得到分页索引的数组 DLNa6
ps.getTotalCount()得到总结果数 +fC#2%VnU
ps.getStartIndex()当前分页索引 u+I3IdU3
ps.getNextIndex()下一页索引 w9G_>+?E
ps.getPreviousIndex()上一页索引 jK\V|5k
AF6d#Klog
M4zX*&w.T
u(8 _[/_B
x1 .3W j
c_@XQ&DC`
<P+G7!KZ&
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 6W)xj6<@
I++W0wa.n
,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 di8W2cwz
X*TuQ\T
一下代码重构了。 tn"Y9
k|
jz{(q;
我把原本我的做法也提供出来供大家讨论吧: ^t\kLU
AeNyZ[40T
首先,为了实现分页查询,我封装了一个Page类: [>b
'}4
java代码: i!CKA}",
UiJ^~rn
% MfGVx}nG
/*Created on 2005-4-14*/ 4(` 2#
package org.flyware.util.page; @m+pr\h(
u3Zzu \{
/** Z-N-9E
* @author Joa Iq4 Kgc
* u~'m7
*/ =?meO0]y
publicclass Page { t`
}20=I+
1Pud,!\%q
/** imply if the page has previous page */ {toyQ)C7
privateboolean hasPrePage; B'G*y2UnG
L
LYHr
/** imply if the page has next page */ p{A}p9sjx
privateboolean hasNextPage; Y0/jH2 n
>u BV
/** the number of every page */ 5?V?
privateint everyPage; #JJp:S~`
pRQfx^On
/** the total page number */ {ED(O-W
privateint totalPage; 8\qCj.>S
>>oASo
/** the number of current page */ n:5O9,umZ
privateint currentPage; -4*'WzWr
AmT|%j&3
/** the begin index of the records by the current ,z?<7F1q=
$I}Hk^X
query */ p|bc=`TD
privateint beginIndex; s
T
:tFK\
]MqH13`)A
<
"L){$
/** The default constructor */ O?C-nw6kP
public Page(){ egxJ3.
Vq\..!y
} 5{R#h :
X/`#5<x
/** construct the page by everyPage zCBtD_@
* @param everyPage
:f?,]|]+-
* */ s0XRL1kWr
public Page(int everyPage){ LH3N}J({
this.everyPage = everyPage; *f0.= ?
} s3MMICRT.
c{m
;"ZCFS
/** The whole constructor */ m'Ek p
public Page(boolean hasPrePage, boolean hasNextPage, !_XU^A>
xu%!
b0
9Th32}H
int everyPage, int totalPage, i">z8?qF
int currentPage, int beginIndex){ `L"p)5H
this.hasPrePage = hasPrePage; TzevC$m;z
this.hasNextPage = hasNextPage; A1k&`
|k
this.everyPage = everyPage; +c]N]?k&
this.totalPage = totalPage; 8CnI%_Su
this.currentPage = currentPage; c5=v`hv
this.beginIndex = beginIndex; VeN&rjc
} _ pH6uuB
'&pf
/** !dbA (
* @return `G ;Lz^
* Returns the beginIndex. So)KI_M
*/ 7uv/@(J"$
publicint getBeginIndex(){ ?G>5 D`V
return beginIndex; < ;%q
} 3h D2C'KD
5&