Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ~Xr[d07bC
>,)U46
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 @.G;dL.f{
[3tU0BU"
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 (5hUoDr!
q"f7$
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 *kj+6`:CPs
l6MBnvi
。 6vU%Y_n=y]
;{e'q?Y
分页支持类: \t&8J+%
91fZr
java代码: ?fc<3q"
)WvOa] :
QMDkkNK
package com.javaeye.common.util; *N6sxFs
P.^*K:5@
import java.util.List; %_>8.7
^0(D2:E
publicclass PaginationSupport { g]?>6 %#rA
,d^H Ag^j
publicfinalstaticint PAGESIZE = 30; <<@F{B7h
/7.//klN
privateint pageSize = PAGESIZE; +*eVi3
<0Gk:NB,
privateList items; $}0\sj%
nVP|{M
privateint totalCount; Udjn.D
R"z}q(O:
privateint[] indexes = newint[0]; AJ#YjkO>]
4O{,oN~7
privateint startIndex = 0; q+?q[:nR-
YWk+}y}^d
public PaginationSupport(List items, int z\WyL ;
(d .M} G
totalCount){ 6"r _Y7%
setPageSize(PAGESIZE); oGt2n:
setTotalCount(totalCount); M%$-c3x
setItems(items); }Cb-7/
setStartIndex(0); '@^mesMG
} ? Z2`f6;W4
I%z,s{9p
public PaginationSupport(List items, int wkJ@#jD*[
h=kC3ot\
totalCount, int startIndex){ |`AJP
setPageSize(PAGESIZE); g-/ }*ml
setTotalCount(totalCount); g6?5
setItems(items); N{a=CaYi+
setStartIndex(startIndex); :{KpnJvd
} $L'[_J
F$YT4414
public PaginationSupport(List items, int #3FsK
1V,DcolRY
totalCount, int pageSize, int startIndex){ @$~;vS
setPageSize(pageSize); ~svea>Fmr
setTotalCount(totalCount); 2LCOB&-Ww
setItems(items); S++jwP
setStartIndex(startIndex); #aE>-81SS&
} mWMtz]M}
1>bNw-kz7
publicList getItems(){ *3fhVl=8^*
return items; CX]L'
} iBY16_q
j:HIcCp
publicvoid setItems(List items){ m:9|5W
this.items = items; ;2aPhA
} be(hY{y`
"z*?#&?,
publicint getPageSize(){ 8 9maN
return pageSize; !&{"tL@.
} E>u U6#v
VMu?mqEa
publicvoid setPageSize(int pageSize){ m mH
xPd
this.pageSize = pageSize; K}Q:L(SSr\
} \[AJWyP
]na$n[T/I
publicint getTotalCount(){ Z dT-
return totalCount; py wc~dWvz
} @J'tPW<$
{WTy/$ Qk
publicvoid setTotalCount(int totalCount){ xg'xuz$U
if(totalCount > 0){ dleCh+ny?
this.totalCount = totalCount; ]i>,oxBWe
int count = totalCount / nJwP|P_
}V 4u`=
pageSize; 0W)|n9
if(totalCount % pageSize > 0) d@ ]N
count++; D8WKy
indexes = newint[count]; xO4""/n
for(int i = 0; i < count; i++){ nL]eGC
indexes = pageSize * R.YUUXT
sg4(@>
i; nZEew.T:6
} ?gMq:[XN
}else{ y-~_ W 6\
this.totalCount = 0; Us%g&MWdpb
} +DE;aGQ.z?
} 7ab'q&Y[
_SMi`ie#
publicint[] getIndexes(){ ^-"tK:{
return indexes; Qve5qJ
} hG272s 2
` ^;J<l
publicvoid setIndexes(int[] indexes){ I]WvcDJ}C
this.indexes = indexes; 27}0
} 9!ARr@ ;
O.{
publicint getStartIndex(){ hd`jf97*
return startIndex; z]2lT
IWg
} $h5QLN
wU"w
publicvoid setStartIndex(int startIndex){ (#]9{C;
if(totalCount <= 0) BQ B<+o'
this.startIndex = 0; Xi w
elseif(startIndex >= totalCount) Ny2bMj.o
this.startIndex = indexes U6YHq2<
\$gA2r
[indexes.length - 1]; wZ=@0al
elseif(startIndex < 0) 8TTj<T!N
this.startIndex = 0; e2L>"/
else{ `$3ktQ $
this.startIndex = indexes 3r[s_Y*
O,#,` 2Qc
[startIndex / pageSize]; 8EBd`kiq
} J'yCVb)V
} 0:c3aq&u
VLoRS)
publicint getNextIndex(){ 9~y:K$NO
int nextIndex = getStartIndex() + n3$u9!|P
46~nwi$,^
pageSize; e7plL^^`
if(nextIndex >= totalCount) alBnN<UM
return getStartIndex(); :NB.ib@*
else hDc2T
return nextIndex;
OLoo#HW
} 7G0;_f{
^oNcZK>
publicint getPreviousIndex(){ KEf1GU6s
int previousIndex = getStartIndex() - 3_]QtP3
&-m}w :j=
pageSize; PH'n`D#
if(previousIndex < 0) 5Fbb5`(
return0; 4JXJ0T ar
else X1BqN+=@9
return previousIndex; mP?}h
} ?a'EkZ.dB
,fo7.
h4{
} *:`fgaIDa
x'SIHV4M@Q
KcW 5
+>yspOEz
抽象业务类 0wAB;|~*62
java代码: ]cMZ7V^
LLoV]~dvUu
LLMGs: [
/** 'R99m?"
* Created on 2005-7-12 6z'0fi|EN
*/ 77j"zr7v
package com.javaeye.common.business; ?v'CuWS
_,I~1"
import java.io.Serializable; LvU/,.$
import java.util.List; &v Q5+
@moaa} 1
import org.hibernate.Criteria; a.ijc>K
import org.hibernate.HibernateException; ;";>7k/}
import org.hibernate.Session; @gQ?cU 7
import org.hibernate.criterion.DetachedCriteria; l>J%Q^
import org.hibernate.criterion.Projections; NGZtlNvh
import MJa`4[/
"#iO{uMWb
org.springframework.orm.hibernate3.HibernateCallback; Yq:/dpA_
import eKU4"XTk
h]IoH0/
org.springframework.orm.hibernate3.support.HibernateDaoS U.ZA%De
JV+Uy$P!
upport; JIc9csr:b
v
"[<pFj^
import com.javaeye.common.util.PaginationSupport; aJc>"#+
o
:_+U[k(#
public abstract class AbstractManager extends >y!O_@>z
m |.0$+=
HibernateDaoSupport { ISTAJ8"
D
$"#M:V@
privateboolean cacheQueries = false; +aqQa~}r
^9YS dFH/
privateString queryCacheRegion; ^PMA"!n8
;6?,Yhk$h
publicvoid setCacheQueries(boolean _T=";NSa
IWwOP{ <ZQ
cacheQueries){ ?q0a^c?A^
this.cacheQueries = cacheQueries; Z+4Mo*#
} RusiCo!r
-W:@3\{
publicvoid setQueryCacheRegion(String dN){w _
[~;wCW,1
queryCacheRegion){ pTJ_DH
this.queryCacheRegion = '%YTMN@
Upm#:i|"
queryCacheRegion; y;O
6q206
} )a+bH </'
CM`Q((
publicvoid save(finalObject entity){ "'>fTk_
getHibernateTemplate().save(entity); WJ 'lYl0+7
} F(,SnSam
@#9xSs#
publicvoid persist(finalObject entity){ =Hj3o_g-
getHibernateTemplate().save(entity); J>nta?/,X
} 64:p 4N
P)ne^_
publicvoid update(finalObject entity){ U)z1RHP|z
getHibernateTemplate().update(entity); !=+;9Ry$z
} =E~_F>SD
Exat_ L'?
publicvoid delete(finalObject entity){ 48!F!v,j)x
getHibernateTemplate().delete(entity); %,d+jBM
} =
@FT$GQ
9s*UJIL
publicObject load(finalClass entity, O[=W%2I!i
aecvz0}@R
finalSerializable id){ lDs C>L-F
return getHibernateTemplate().load qtP*O#1q
4@-Wp]
(entity, id); %Wc$S]>i
} #4Cf-$J
lB|.TCbW
publicObject get(finalClass entity, E/E|*6R
&(20*Vn,O
finalSerializable id){ UG<<.1JL
return getHibernateTemplate().get WkoYkkuzj
pU u')y
(entity, id); X0KUnxw
} X,K`]hb*0_
\,`iu=YZv
publicList findAll(finalClass entity){ 86o'3G9@
return getHibernateTemplate().find("from mNX0BZ
O@rZ^Aa
" + entity.getName()); vLCm,Bb2L
} 73!])!SVI
4_4|2L3
publicList findByNamedQuery(finalString G2J4N2hu
FWS!b!#,N
namedQuery){ Ej`G(
return getHibernateTemplate RLDu5
B^x}=Z4
().findByNamedQuery(namedQuery); Fk?KR
} HA0yX?f]
U,aMv[Z B
publicList findByNamedQuery(finalString query, hllb\Y)XL
o* QZf*M
finalObject parameter){ g;y*F;0@
return getHibernateTemplate iyMoLZ5
-"xC\R
().findByNamedQuery(query, parameter); /j(<rz"j
} {|Fn<&G
@t8{pb;v
publicList findByNamedQuery(finalString query, \(1WLP$2U
dwm>!h
finalObject[] parameters){ lq27^K
return getHibernateTemplate P;e@<O
;S+"z;$m
().findByNamedQuery(query, parameters); c$)!02
} SxM5'KQ
Zg >!5{T
publicList find(finalString query){ g^:7mG6C
return getHibernateTemplate().find Zor Q2>
!(N,tZ
(query); !]!9 $6n
} 4rNuAK`2
%#7^b=;=
publicList find(finalString query, finalObject vn96o]n
E~,Wpl}
parameter){ ]@sLX ek
return getHibernateTemplate().find x4@IK|CE
1.j;Xo/+:V
(query, parameter); 8#a2 kR<b
} $yMNdBI[
?w@KF%D
public PaginationSupport findPageByCriteria jiLt *>I
Oxh.&
(final DetachedCriteria detachedCriteria){ 97VS
xhr
return findPageByCriteria 6x!
q
Pv3 e*I((
(detachedCriteria, PaginationSupport.PAGESIZE, 0); [2zS@p
} yrR,7vJ
+RD{<~i
public PaginationSupport findPageByCriteria /909ED+)>9
74%Uojl"
(final DetachedCriteria detachedCriteria, finalint 0 oHnam
7p,!<X}%
startIndex){ m?<5-"hz
return findPageByCriteria X!0m,
1${Cwb/F
(detachedCriteria, PaginationSupport.PAGESIZE, i>@"&
'FGf#l<
startIndex); irzWk3@:
} 0'^zIL#.
62J-)~_
public PaginationSupport findPageByCriteria LgoUD*MbQ
ZCCwx71j
(final DetachedCriteria detachedCriteria, finalint [+4--#&{
-8, lXrH
pageSize, *'ex>4^
finalint startIndex){ :jljM(\
return(PaginationSupport) 8w4cqr4m
O8WLulo
getHibernateTemplate().execute(new HibernateCallback(){ ADN
publicObject doInHibernate m=%WA5c?
qi-!iT(fe
(Session session)throws HibernateException { h8tKYm
Criteria criteria = wr;8o*~
F /% 5 r{
detachedCriteria.getExecutableCriteria(session); l+i9)Fc<i
int totalCount = !3#*hL1fy
"]D2}E>U;
((Integer) criteria.setProjection(Projections.rowCount iMr/i?`i
L&SlUXyt.c
()).uniqueResult()).intValue(); MzO4Yv"A
criteria.setProjection Ue)8g#
3 ~^ }R
(null); &5F@u
IA
List items = mkOj&Q
9DP6g<>B
criteria.setFirstResult(startIndex).setMaxResults ,Q8)r0 c
O U3KB
(pageSize).list(); m\xE8D(,
PaginationSupport ps = J^BC
Jri"Toz0
new PaginationSupport(items, totalCount, pageSize, 6tg0=_c
3xGk@ 333
startIndex); q!+m,
!M
return ps; t9B]V
} U.HeIJ#
}, true); L|[0&u!
} Gdf*x<T1
%rZJ#p[e)=
public List findAllByCriteria(final _4jRUsvjY
|0$wRl+kN
DetachedCriteria detachedCriteria){ <kr%ylhIu
return(List) getHibernateTemplate Lz'05j3!
5>'1[e45
().execute(new HibernateCallback(){ -h<Rby
publicObject doInHibernate vo_m$ /O
i-4pdK u
(Session session)throws HibernateException { F7zBm53
Criteria criteria = 4^mpQ.]lO
Cp2$I<T
detachedCriteria.getExecutableCriteria(session); lIj2w;$v
return criteria.list(); 2|n~5\K|t
} 0*KU"JcXd
}, true); 5ZkMd!$y
} LMmW3W`
,#PeK(
public int getCountByCriteria(final f._FwD
HXTZ`'Rv
DetachedCriteria detachedCriteria){ w1+xlM,,9
Integer count = (Integer) r-$SF5uv
|?Z;tAF!
getHibernateTemplate().execute(new HibernateCallback(){ `|i[*+WC
publicObject doInHibernate GX+o A]
{$ghf"
(Session session)throws HibernateException { C4 &1M
Criteria criteria = 7VdG6`TDR
{b^JH2,
detachedCriteria.getExecutableCriteria(session); D d$ SQ
return cDS6RO?
)J"Lne*"
criteria.setProjection(Projections.rowCount SBY
`
qqUuFMM
()).uniqueResult(); C=6 Vd
} a0oM KGW:
}, true); 'K=n}}&:
return count.intValue(); \)?[1b&[_
} ?-P]m&nh|
} csV.AN'obq
%hzl3>().
h<50jnH!
^y,%Tv>
XO*62>Ed
ZS@Cd9*
用户在web层构造查询条件detachedCriteria,和可选的 b NBpt}$
(q!tI*}
startIndex,调用业务bean的相应findByCriteria方法,返回一个 u~,@Zg87
TM8WaH
PaginationSupport的实例ps。 1YmB2h[Z
j"aimjqd3
ps.getItems()得到已分页好的结果集 piE9qXn
ps.getIndexes()得到分页索引的数组 Htseu`>_$
ps.getTotalCount()得到总结果数 _N 5$>2
ps.getStartIndex()当前分页索引 C%8jWc
ps.getNextIndex()下一页索引 ?\C7.of
ps.getPreviousIndex()上一页索引 #TLqo(/
e'I13)
!tkP!%w
-t, .A/?
V/Q~NXN
HY.??
5MH
L=u>}?!,Fj
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 UC)-Fd
72qbxPY13h
,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 f>Mg.9gJ(
51Yq>'8
一下代码重构了。 0^VA,QkQ\
5+<<:5_6l
我把原本我的做法也提供出来供大家讨论吧: Zb)j2Xgl
[]D@"Bz
首先,为了实现分页查询,我封装了一个Page类: @<5?q:9.8
java代码: 0s"g%gq|
ppt`5F O
;Jex#+H(:D
/*Created on 2005-4-14*/ tl |Qw";I
package org.flyware.util.page; d>z?JDt
gw0b>E8gZ&
/** :zk69P3
* @author Joa fHek!Jv.
* Y4]USU!PA
*/ 1=x4m=wV
publicclass Page { KXEDpr
Omkl|l9
/** imply if the page has previous page */ ;Ub;AqY
privateboolean hasPrePage; u%FG%
j?C
9*gD;) !
/** imply if the page has next page */ PT7L65
privateboolean hasNextPage; E\2|
)J&