Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 H0b6ZA%n
$x_52 j\j
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 LVFsd6:h
uyRA`<&w
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 7}tZ?vD
s!;VUr\
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 pg}+lYGP
.UhBvHH
。 U>_\
,dj*p,J
分页支持类: 6n6VEwYj
/mBBeg^a
java代码:
6:@t=C
e(; `9T
'UvS3]bSYW
package com.javaeye.common.util;
2HK
kGuk
-P
import java.util.List; R4~zL!7;
Wt)SdF=U/
publicclass PaginationSupport { @+\S!o3m
8} ?Y;>s\
publicfinalstaticint PAGESIZE = 30; 4lh
Ux)p%-
privateint pageSize = PAGESIZE; q4.dLU,1
F2PLy
q
privateList items; tC@zM.v%
l@Eq|y,
privateint totalCount; Q(;B)
OBw`!G*w
privateint[] indexes = newint[0]; Y zBA{FE
/@:up+$
privateint startIndex = 0; nc\C4g
kF+ }.x%
public PaginationSupport(List items, int >xZhK63C/
VM]GYz|#]
totalCount){ APtselC
setPageSize(PAGESIZE); 7tfivIj)e
setTotalCount(totalCount); !,6v=n[Nz
setItems(items); _D2bGZN
setStartIndex(0); Y7:Y{7E7
} [6_Du6\h
-Nlf~X
public PaginationSupport(List items, int 8pq-nuf|K
lA.;ZD!
totalCount, int startIndex){ ^0s\/qyqm
setPageSize(PAGESIZE); J%\~<_2ny
setTotalCount(totalCount); x'@32gv
setItems(items); Y0X"Zw
setStartIndex(startIndex); -#S)}NEn
} CEX}`I*-
Nr]8P/[~
public PaginationSupport(List items, int )pZekh]v
ANFg]g.Az
totalCount, int pageSize, int startIndex){ .?i-rTF:
setPageSize(pageSize); C'8!cPFVv
setTotalCount(totalCount); n(Q\',C
setItems(items); sR>`QIi(a
setStartIndex(startIndex); m,@1LwBH
} orB8Q\p'
KCJN<
publicList getItems(){ L*UV
return items; ~gfA](N
} :zj9%4A
2-$bh
publicvoid setItems(List items){ I NPYJ#%
this.items = items; ^)hAVf~E
} @m/;ZQ
#j^('K|
publicint getPageSize(){ 9b" 9m*gC
return pageSize; `s>UU- 9
} h5&/hBN
%su}Ru
publicvoid setPageSize(int pageSize){ L8bI0a]r"*
this.pageSize = pageSize; {HIR>])o
} EREolCASb
uOG-IHuF
publicint getTotalCount(){ 43J\8WBn@
return totalCount; 42V,PH6o
} X/E7o92\
&& DD
publicvoid setTotalCount(int totalCount){ 3qAwBVWa
if(totalCount > 0){ m1hW<
this.totalCount = totalCount; $>'" )7z
int count = totalCount / 2<[eD`u
SLJ&{`"7
pageSize; G%7 4v|cd
if(totalCount % pageSize > 0) S(>@:`=
count++; n%0]V Xx#
indexes = newint[count]; 2/v35| ?
for(int i = 0; i < count; i++){ 6 Iv(
indexes = pageSize * $Wr\[P:
tLD~
i; *t#s$Ga
} A$%Q4jC}
}else{ >Lw}KO`
this.totalCount = 0; \);.0
} VX^o"9Ntl
} 49+ >f
p{ @CoOn
publicint[] getIndexes(){ )YzH k ;(
return indexes; XMN?;Hj>
} fg9?3x
Z
JJ/1daj
publicvoid setIndexes(int[] indexes){ ,&.W6sW
this.indexes = indexes; [F/^J|VMV
} ;dqk@@O"(
*'9)H0
publicint getStartIndex(){ gEr4zae
return startIndex; :vc[/<
} <i_>
y~v`
x],8yR)R
publicvoid setStartIndex(int startIndex){ O!+nF]V4f
if(totalCount <= 0) L@{!r=%_>
this.startIndex = 0; )p$\gwr=2
elseif(startIndex >= totalCount) _ yfdj[Ot`
this.startIndex = indexes X5uS>V%/
AVXX\n\_
[indexes.length - 1]; `y\*m]:
elseif(startIndex < 0) ds*m6#1b
this.startIndex = 0;
2[Z0I4r
else{ a'@-"qk
this.startIndex = indexes $uEJn&n7}
I86e&"40
[startIndex / pageSize]; t6'61*)|0
} D9 qX->p
} Qs|OG
_Kc1
publicint getNextIndex(){ Dh2:2Rz=#7
int nextIndex = getStartIndex() + 2.[_t/T
Y%<`;wK=^
pageSize; \*f;!{P{
if(nextIndex >= totalCount) #*!+b
return getStartIndex(); (Ij0AeJ#
else ![^EsgEB*
return nextIndex; z 0~j
} x}tKewdOSe
#|qm!aGs
publicint getPreviousIndex(){ z^4KU\/JK
int previousIndex = getStartIndex() - FE/$(7rM
zuUT S[
pageSize; `WH[DQ
if(previousIndex < 0) F\>oxttS1
return0; ZlthYuJ
else K!3{M!B
return previousIndex; Y)$52m5rM
} QJx9I_
MV%Xhfk
} )-=2w-ZX
{mNdL J
"XCU'_k=
\r)%R5_CQ
抽象业务类 {IJ-4>
java代码: \% }raI;Y@
!G7h9CF|{
Y4QLs^IdB
/** >@^<S_KVh
* Created on 2005-7-12 Xo2^N2I
*/ hlX>K
package com.javaeye.common.business; ($c`s8mp
|y.zocBj
import java.io.Serializable; r=h8oUNEJ*
import java.util.List; K!GUv{fp
Z[Wlyb0
import org.hibernate.Criteria; JW=uK$s O
import org.hibernate.HibernateException; Yt -W1vl
import org.hibernate.Session; @4;&hP2Z:
import org.hibernate.criterion.DetachedCriteria; m7JPH7P@BM
import org.hibernate.criterion.Projections; h~ $&
import 4[`[mE18.
{5>3;.
org.springframework.orm.hibernate3.HibernateCallback; 3 h#s([uL
import r,5-XB
kEO1TS
org.springframework.orm.hibernate3.support.HibernateDaoS 7'Lp8
aC`Li^
upport; }/20%fP
Bb~5& @M|N
import com.javaeye.common.util.PaginationSupport; d+tj%7
ji}#MBac
public abstract class AbstractManager extends ASR-a't6
d7E7f
HibernateDaoSupport { !~WZ_z
*2`:VFEV
privateboolean cacheQueries = false; h%'
N hV
?4,@,
ae&
privateString queryCacheRegion; sH%&+4!3
s}wO7Df=+
publicvoid setCacheQueries(boolean #zxd;;p3
rsWQHHkO
cacheQueries){ V{!lk]p}a
this.cacheQueries = cacheQueries; TZ'aNcGg
} f3!n$lj
_74UdD{^o
publicvoid setQueryCacheRegion(String m=H_?W;
>)LAjwhBp
queryCacheRegion){ u*hH}
this.queryCacheRegion = >rKhlUD
zhX;6= X2
queryCacheRegion; /9 pbnzn
} X<Z(]`i
mmHJh\2v
publicvoid save(finalObject entity){ V~85oUc\-
getHibernateTemplate().save(entity); ZPlPN;J^1
} Twx{' S
>5.zk1&H
publicvoid persist(finalObject entity){ `$at9
getHibernateTemplate().save(entity); )S2iIi;Bq
} mf}\s]_c
AP0|z
publicvoid update(finalObject entity){ I] jX7.fx
getHibernateTemplate().update(entity); B%fU'
} k52QaMKa~A
/l^y}o %?
publicvoid delete(finalObject entity){ usy,V"{
getHibernateTemplate().delete(entity); ijFV<P
} IP04l;p/
ehE-SrkU'
publicObject load(finalClass entity, -,^WaB7u\
y:.?5KsPI
finalSerializable id){ !N1J@LT5h
return getHibernateTemplate().load SiV*WxQe
VG)="g[%)
(entity, id); x9%-plP
} \n_3Bwd~
1aq2aLx
publicObject get(finalClass entity, 80}4/8
kbhX?; <`
finalSerializable id){ x6ahZ
return getHibernateTemplate().get /ERNS/w
Zi/-~')E
(entity, id); ?I[h~vr6.
} ^!}F%
iS
publicList findAll(finalClass entity){ _s*!
t
return getHibernateTemplate().find("from ra]:$XJ5=a
zw]3Vg{T
" + entity.getName()); q!&B6]
} .b,~f
l<xFnj
publicList findByNamedQuery(finalString +*C^:^jA
>$uUuiyL4
namedQuery){ f*<ps
o
return getHibernateTemplate !!WJn}
K6hfauWd[
().findByNamedQuery(namedQuery); hO6RQ0Iv@
} -2 xE#r
&DLhb90
publicList findByNamedQuery(finalString query, ~M*gsW$
1"O&40l
finalObject parameter){ 4)^vMG&
return getHibernateTemplate 3D[=b%2\
O:JPJ"!
().findByNamedQuery(query, parameter); (B:uc_+
} "15=ET
]G*$W+G]
publicList findByNamedQuery(finalString query, C2G |?=
>S'>!w
finalObject[] parameters){ IY)5.E
_
return getHibernateTemplate SKR;wu
TV=c,*TV
().findByNamedQuery(query, parameters); K2HvI7$-
} s@~/x5jwCs
hJ[UB
publicList find(finalString query){ N@()F&e
return getHibernateTemplate().find *S4aF*Qk
TKOP;[1h
(query); \XS]N_}8>
} RdI};K
Dx3 %KS
publicList find(finalString query, finalObject JNBT^=x
hk}
t:<
parameter){ h$Tr sO
return getHibernateTemplate().find t77'fm
Ea]T>4
(query, parameter); v459},!P
} Q]#Z9 H
+
|C=ZU
public PaginationSupport findPageByCriteria ^f|<R8 `
-~O/NX
(final DetachedCriteria detachedCriteria){ o/1JO_41
return findPageByCriteria RZh}:
(6R4 \8z2
(detachedCriteria, PaginationSupport.PAGESIZE, 0); &@6 GI<
} g$w6kz_[
j"hASBTgp
public PaginationSupport findPageByCriteria ;SY.WfVA7
t',BI
(final DetachedCriteria detachedCriteria, finalint v=p0 +J>
9p`r7:
startIndex){ JIxiklk
return findPageByCriteria %[Zz0|A
lzDdD3Ouc
(detachedCriteria, PaginationSupport.PAGESIZE, k[9A,N^lZB
x=Mm6}/
startIndex); s;1e0n
} z0Xa_w=
|>2:eH
public PaginationSupport findPageByCriteria CH;;V3
_~A~+S}
(final DetachedCriteria detachedCriteria, finalint DYRE1!
6Z8l8:r-6
pageSize, _z8;lt
finalint startIndex){ fsvYU0L
return(PaginationSupport) p{.8_#O%S
M#a&\cqC
getHibernateTemplate().execute(new HibernateCallback(){ {/ &B!zvl
publicObject doInHibernate h8=h >W-
S}7>RHe
(Session session)throws HibernateException { RmO yGSO
Criteria criteria = uyT/Xzo3
Rp/-Pv
detachedCriteria.getExecutableCriteria(session); _7@z_i_c
int totalCount = !O{z 3W
h|p[OecG
((Integer) criteria.setProjection(Projections.rowCount R1'`F{56
|zpx)8Q
()).uniqueResult()).intValue(); :;4SQN{2
O
criteria.setProjection yvxl_*Ds8
A5XR3$5P
(null); r1Z<:}ZwK
List items = r)b<{u=]
*]x_,:R6Ow
criteria.setFirstResult(startIndex).setMaxResults a)S7}0|R
C) .2gQ
G
(pageSize).list(); O
>FO>
PaginationSupport ps = Km*<Kfcz
lIh[|]
new PaginationSupport(items, totalCount, pageSize, 7Fl-(Nv`
"H1:0p
startIndex); Ei~f`{i
return ps; QlD6i-a
} 7lU.Nit
}, true); ow.j+<M
} 2U9&l1P=
` X}85
public List findAllByCriteria(final 8i:[:Z
|+NuYz?
DetachedCriteria detachedCriteria){ 16$y`~c-z
return(List) getHibernateTemplate &p"(-
r7I
B{}>-
().execute(new HibernateCallback(){ m:{tgcE
publicObject doInHibernate &71e5<(dG
'm O2t~n
(Session session)throws HibernateException { )(bxpW
Criteria criteria = (X}@^]lpa
T~s}N x#
detachedCriteria.getExecutableCriteria(session); AuCWQ~
return criteria.list(); FT/amCRyT
}
}B ff,q
}, true); H06Bj(Y!
} G$5m$\K
)#`H."Z
public int getCountByCriteria(final =nVmthGw
VJ{pN ~_1
DetachedCriteria detachedCriteria){ n
)K6i7]xk
Integer count = (Integer) \!H{Ks{#R.
&qRJceT(
getHibernateTemplate().execute(new HibernateCallback(){ qI2'u %
publicObject doInHibernate "l,UOv c
}.{}A(^YR
(Session session)throws HibernateException { iV
hJH4
Criteria criteria = .Z%G@X*
o6|-=FcvC
detachedCriteria.getExecutableCriteria(session); - DL"-%X.
return +v15[^F
Q2\
criteria.setProjection(Projections.rowCount $(q8y/,R*-
]}LGbv"`A
()).uniqueResult(); xjq0D[
} 2P5_zND
}, true); _e'Y3:
return count.intValue(); Kt
`
} 4P kfUMX
} OD+5q(!"a
P(h5=0`*PR
i2`0|8mw'
>o[|"oLO
L2|aHI1'l
U:lv^QPG
用户在web层构造查询条件detachedCriteria,和可选的 }*kJ-q&0
_V@P-Ye
startIndex,调用业务bean的相应findByCriteria方法,返回一个 #WufZ18#
qY(:8yC36
PaginationSupport的实例ps。 T9)wj][ .
X\sm[_I
ps.getItems()得到已分页好的结果集 V(mnyI
ps.getIndexes()得到分页索引的数组 qm(1:iK,0
ps.getTotalCount()得到总结果数 1^{`lK~2
ps.getStartIndex()当前分页索引 \*"`L3
ps.getNextIndex()下一页索引 km\%BD~
ps.getPreviousIndex()上一页索引 =B(mIx;m
G6O/(8
9L)L|4A.l
I/p]DT
h~miP7,c<u
$TG?4
'sU)|W(3U
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 &" h]y?Q
"mZ.V
,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 G)7)]yBL
=!
mJG
一下代码重构了。 P5URvEnz:
3] 76fF\^[
我把原本我的做法也提供出来供大家讨论吧: 0Nr\2|
')o0O9/;
首先,为了实现分页查询,我封装了一个Page类: xP@/9SM
java代码: r
nBOj#N
BGqa-d
CC8k&u,
/*Created on 2005-4-14*/ aRwnRii
package org.flyware.util.page; {Y_Nj`#BT
(9GbG"
/** ./w{L"E
* @author Joa R6@uM<