Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 e<iTU?eJM
"=4=Q\0PT
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 I0Wn?Qq=@
Haq23K
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 eUF PzioW
IQ2<Pinv
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ELY$ ]^T
JK,#dA#
。 RR`?o\
HV>|f'45
分页支持类: K{q(/>:
a`/[\K6
java代码: "UVV/&`o
t@4X(i0
1DZGb)OU
package com.javaeye.common.util; u"C`S<c
TN/I(pkt1B
import java.util.List; L d#
9&rn3hmP
publicclass PaginationSupport { b-~`A;pr
:4(7W[r6
publicfinalstaticint PAGESIZE = 30; e5veq!*C?
prIq9U|@
privateint pageSize = PAGESIZE; 2Q1* Xq{
.JQR5R |Q
privateList items; W%vh7>.
\?g)jY
privateint totalCount; H26j]kY
%,6@Uu#%6
privateint[] indexes = newint[0]; N_/&xHw
0FEb[+N
privateint startIndex = 0; QbOmJQ
;Y K^&!N
public PaginationSupport(List items, int 6@Eip[e
.z+QyNc:
totalCount){ )I!l:!Ij*D
setPageSize(PAGESIZE); 8MW|CM4Q
setTotalCount(totalCount); p9l&K/
setItems(items); \% ^<Ll
setStartIndex(0); g*Cs/w
} 2Ybz`O!
,:=E+sS
public PaginationSupport(List items, int "#[Y[t\Ia
x`C;
totalCount, int startIndex){ 5%tIAbGW
setPageSize(PAGESIZE); :hxfd b-
setTotalCount(totalCount); BMFpkK9|
setItems(items); I"<~!krt%
setStartIndex(startIndex); ps<JKHC/c
} `33h4G
%o^'(L@z
public PaginationSupport(List items, int m;Sw`nw?
-R6z/P(}
totalCount, int pageSize, int startIndex){ ?*}V>h 8m)
setPageSize(pageSize); Z(Q?epyT
setTotalCount(totalCount); p?Yovckm
setItems(items); &Hh%pY"
setStartIndex(startIndex); (`>4~?|+T
} oX?2fu-
U
R@'J@V#:
publicList getItems(){ "%>/rh2Iq
return items; 173/A=]
} m[Zz(tL
+yCIA\i#t6
publicvoid setItems(List items){ M=0I 3o}J
this.items = items; TioI$?l>W(
} 1j0yON
=>S5}6
publicint getPageSize(){ +TUtVG
return pageSize; !^`ZHJ-3>;
} /*D]4AK
RQ/X{<lQ)
publicvoid setPageSize(int pageSize){ !f7}5/YC7v
this.pageSize = pageSize; 7/aJ?:gX
} q;B-np?U
Y\ 9uR!0
publicint getTotalCount(){ {u9VHAXCf
return totalCount; 6Y}#vZ
} 2psLX
,F:l?dfB\I
publicvoid setTotalCount(int totalCount){ oVmGZhkA@'
if(totalCount > 0){ |y;+xEl6
this.totalCount = totalCount; "d.qmM
int count = totalCount / ! daXF&q
NG S/lKz
pageSize; %) q5hB
if(totalCount % pageSize > 0) b/O~f8t
count++; ;Iv)J|*
indexes = newint[count]; 7i6-Hq
for(int i = 0; i < count; i++){ ,ci
tzh
indexes = pageSize * R<k4LHDy
Oo=}j
i; o?hya.;h4
} Is?0q@
}else{ trgj]|?M
this.totalCount = 0; Z8nNZ<k
} LD^V="d
} fdp/cwd
\7("bB=
publicint[] getIndexes(){ q]
,&$d^@
return indexes; 3G5i+9Nt.L
} Ij{{Z;o3
WERK JA
publicvoid setIndexes(int[] indexes){ rxm!'.+
this.indexes = indexes; vco:6Ab$
} )v
['p
ZH~m%sA
publicint getStartIndex(){ Hyq|%\A
return startIndex; C Q3;NY=o
} s*(Y<Ap7d
4MIL#1s
publicvoid setStartIndex(int startIndex){ my*UN_]
if(totalCount <= 0) Mx$VAV^\
this.startIndex = 0; 9\Yj`,i5
elseif(startIndex >= totalCount) xPsuDi8u
this.startIndex = indexes htMpL
ogjm6;
[indexes.length - 1]; H={fY:%
elseif(startIndex < 0) T#er5WOH
this.startIndex = 0; lR;<6
else{ 1 ht4LRFi
this.startIndex = indexes nm\n\j~
>JC.qjA
[startIndex / pageSize]; 3-LO
} ~u}[VP
} wm@1jLjrQ
WWq)CwR
publicint getNextIndex(){ 0W]Wu[k
int nextIndex = getStartIndex() + d [K56wbpx
\?
MuORg
pageSize; eFZ`0V0
if(nextIndex >= totalCount) f9OVylm
return getStartIndex(); VbA#D 4;
else 9{ciD
"!&V
return nextIndex; (AR-8
} fN t
rmWG9&coW
publicint getPreviousIndex(){ 8]2S'mxE
int previousIndex = getStartIndex() - #M{}Grg
4S03W
pageSize; 1N:eM/a
if(previousIndex < 0) ab3" ?.3m
return0; ScM2_k`D
else F"a,[i,[W
return previousIndex; 1a#wUd3
} zPhNV8k-
zif()i
} y .
AN0
zjVb+Z\n
51&wH
mN~;MR;
抽象业务类 ~_^nWT*BV
java代码: 2R|2yAh
0/-[k
R,6?1Z:J
/** HHg=:>L z
* Created on 2005-7-12 MZ% P(5
*/ {N7,=(-2=
package com.javaeye.common.business; ` LU&]NS3
t{x&|%u
import java.io.Serializable; dd98vVj
import java.util.List; yK [~(!c5
tJ'U<s
import org.hibernate.Criteria; .@ 1\26<
import org.hibernate.HibernateException; )c+ZQq
import org.hibernate.Session; o7hjx hmC
import org.hibernate.criterion.DetachedCriteria; ))306*X\
import org.hibernate.criterion.Projections; o.y4&bC14;
import NhpGa@[D
n;2W=N?y
org.springframework.orm.hibernate3.HibernateCallback; !aIIjWz]
import 2BRY2EF
! =|{
org.springframework.orm.hibernate3.support.HibernateDaoS Udd|. J Rd
5n?fZ?6(
upport; 6;5}%
B:#h
(QqKttL:
import com.javaeye.common.util.PaginationSupport; =BNmuAY7
=]etw
public abstract class AbstractManager extends J#'c+\B<2X
CUY2eQJ{U
HibernateDaoSupport { 2b3x|9o8
Y }e$5
privateboolean cacheQueries = false; Xj|j\2$ 0
FDpNM\SR1l
privateString queryCacheRegion; DAc jx:~
qItj`F)d
publicvoid setCacheQueries(boolean kj+AsQC,
umD .
cacheQueries){ <qv:7@
this.cacheQueries = cacheQueries; M62V NYt
} E-Cj^#OY|N
>/evL
/
publicvoid setQueryCacheRegion(String ~Dgui/r9J
Sh{odrMj*
queryCacheRegion){ ^Z2%b>
this.queryCacheRegion = cl14FrpYu
=p^*y-z
queryCacheRegion; 2nOQ48haT
} a-8~f8na{(
]Alu~ Dw
publicvoid save(finalObject entity){ U4^dDj
getHibernateTemplate().save(entity); rK)%n!Z
} 7F.>M
#WfJz}P,!
publicvoid persist(finalObject entity){ NeeymyW
getHibernateTemplate().save(entity); sF(U?)48
} 8Ck:c45v
$6ITa }o
publicvoid update(finalObject entity){ }7Pd\t G]
getHibernateTemplate().update(entity); (3=. 3[
} [wIyW/+
WYI? M
publicvoid delete(finalObject entity){ NoiU5pP
getHibernateTemplate().delete(entity); QWfwoe&;R:
} rpy`Wz/[
SE%i@}
publicObject load(finalClass entity, ,!bOzth2>K
iTxn
finalSerializable id){ xR;Xx;
return getHibernateTemplate().load :'.-*Ew
ka"jv"z
(entity, id); g/JAr<
} -+?0|>Nh
ou96
P<B
publicObject get(finalClass entity, Gz^g!N[
24|:VxO
finalSerializable id){ ib uA~\5
return getHibernateTemplate().get :i?Z1x1`
NE3G!qxL
(entity, id); +.[#C5
} >8jDW "Ua
5M*q{kX)
publicList findAll(finalClass entity){ ZhM-F0;`
return getHibernateTemplate().find("from y\)bxmC
9lOUE
" + entity.getName()); -/7[_,
} Tcr&{S&o
/`2VJw
publicList findByNamedQuery(finalString %xWmzdn
<6-(a;T!7
namedQuery){ )pJ}o&J
return getHibernateTemplate NL2n\%n
Zw"6-h4
().findByNamedQuery(namedQuery); M,y='*\M
} 213D{#2
s9O] tk
publicList findByNamedQuery(finalString query, zXZy:SD
:sM|~gT
finalObject parameter){ ("mW=Ln
return getHibernateTemplate G{ F>=z"(l
r_
r+&4n
().findByNamedQuery(query, parameter); {TUCa
} {`l]RIig
c3oI\lU
publicList findByNamedQuery(finalString query, qY#*zx
c|ZZ+2IYd
finalObject[] parameters){ @yobT,DXi
return getHibernateTemplate XTHrf'BU
:GGsQ
n
().findByNamedQuery(query, parameters); K\n %&w
} $m{\<A
Tz%l9aC
publicList find(finalString query){ ,3N8
return getHibernateTemplate().find j>0S3P,
/A##Yv!biR
(query); F-_RL-hbN%
} Rp. @
-c|O!Lc-
publicList find(finalString query, finalObject @{t^8I#]
@RT yCr
parameter){ MS,H12h
return getHibernateTemplate().find bYG}CO
L\hPw{)
(query, parameter); tk_y~-xz
} \U~ggg0h
RTF{<,E.UX
public PaginationSupport findPageByCriteria /j3oHi$
}qbz &%R
(final DetachedCriteria detachedCriteria){ s?OGB}
return findPageByCriteria zA( 2+e 7
APK@Oq
(detachedCriteria, PaginationSupport.PAGESIZE, 0); gxt2Mq;q~}
} SHz& o[u
a$;+-Y
public PaginationSupport findPageByCriteria :gQc@)jZ(*
7e}p:Vfp
(final DetachedCriteria detachedCriteria, finalint TpMfk7-
?e&CbVc4
startIndex){ '90B),c{
return findPageByCriteria /Tv<
l
yu}4L'e
(detachedCriteria, PaginationSupport.PAGESIZE, ,{zvGZ|
`EWeJ(4Z@
startIndex); )Tb{O
} b/ZX}<s(1=
:(I)+;M}P
public PaginationSupport findPageByCriteria @JN%P}4)
_k6N(c2Nd
(final DetachedCriteria detachedCriteria, finalint jzzVZ%t
7B7I'{d
pageSize, !j7b7<wR
finalint startIndex){ zhYE#hv2
return(PaginationSupport) ojyG|Y
%!YsSk,
getHibernateTemplate().execute(new HibernateCallback(){ SOP=
X-6f
publicObject doInHibernate }3)$aI_
Rs<,kMRGVL
(Session session)throws HibernateException { EcwHO
Criteria criteria = e(!a~{(kq%
nc$?tC9V
detachedCriteria.getExecutableCriteria(session); 1d-j_H`s
int totalCount = %NxNZe
x-%nnC6e
((Integer) criteria.setProjection(Projections.rowCount RZ?>>Ll6
5]'iSrp
()).uniqueResult()).intValue(); n7{1m$/
criteria.setProjection !kmo%+
I0OsaX'
(null); Prjl ;[I}
List items = X*FK6,Y|(
G_dia6
criteria.setFirstResult(startIndex).setMaxResults *OsXjL`f
6p1TI1(
(pageSize).list(); 'OF)`5sj
PaginationSupport ps = /vU9eh"%
qn4Dm ^
new PaginationSupport(items, totalCount, pageSize, B=n]N+
2.; OHQTE
startIndex); .l#Pmd!
return ps; _KD(V2W
} R`s /^0
}, true); )NyGV!Zuu
} 0}P&G^%"
+cjNA2@
public List findAllByCriteria(final u&pLF%'EQ
pRt )B`#
DetachedCriteria detachedCriteria){ gvwR16N
return(List) getHibernateTemplate %J+$p\c
w(mn@Qc
().execute(new HibernateCallback(){ q$EVd9aN
publicObject doInHibernate k^ZUOWmU|
Dw.>4bA.
(Session session)throws HibernateException { 0imz}Z]
Criteria criteria = ",~3&wx
EE%OD~u&9#
detachedCriteria.getExecutableCriteria(session); IP{Cj=
return criteria.list(); Bv9;q3]z-
} -B`;Sx
}, true); egP3q5~
} QjZ}*p
NWoZDsu
public int getCountByCriteria(final T,H]svN5p
c~$ipX
DetachedCriteria detachedCriteria){ z{ymVd0#
Integer count = (Integer) x`B:M7+\
l(&CO<4q?
getHibernateTemplate().execute(new HibernateCallback(){ 7Y#b7H
publicObject doInHibernate ef53~x
]JhtO{
(Session session)throws HibernateException { a"WnBdFZ
Criteria criteria = ~vF.k,
n,AN&BZ
detachedCriteria.getExecutableCriteria(session); ^//N-?Fx
return u2Rmp4]
Dvx"4EA{7{
criteria.setProjection(Projections.rowCount _@"Y3Lqi
K-vso4@BJ
()).uniqueResult(); }i/{8OuW
} - MBK/
}, true); ~zRW*pd
return count.intValue(); ?BWWb
} ?V7[,I1?
} +mF}j=k
R[_7ab]A
c6?5?_ne
tX)]ZuEi$
5dL-v&W
+vYm:
用户在web层构造查询条件detachedCriteria,和可选的 c4;
`3
]v9<^!
startIndex,调用业务bean的相应findByCriteria方法,返回一个 @aj"12
5_`.9@eh.
PaginationSupport的实例ps。 BwL:B\
071wo7
ps.getItems()得到已分页好的结果集 FPcgQ
v;p
ps.getIndexes()得到分页索引的数组 PE4{;|a }
ps.getTotalCount()得到总结果数 [{Y$]3?}
ps.getStartIndex()当前分页索引 KNK0w 5
ps.getNextIndex()下一页索引 ("{AY?{{
ps.getPreviousIndex()上一页索引 1TbKnmTx
Xf#;GYO|2
LW2Sko?Yo
,xR^8G8
/>$)o7U`+
hW|t~|j#_
_xmM~q[c7p
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 'nCBLc8
.Qi`5C:U
,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 D/{-
R'9TD=qEK
一下代码重构了。 L8ZCGW\Rr
}. ,xhF[
我把原本我的做法也提供出来供大家讨论吧: 3w^q 0/GD
i\`[0dfY
首先,为了实现分页查询,我封装了一个Page类: O %)+ w
java代码: F*]AjD-
$jw!DrE
^&cI+xZ2Y
/*Created on 2005-4-14*/ mBnC]$<R
package org.flyware.util.page; uF<F4m;
@V<