Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 gKb0)4 AK
~%|G+m>
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Hwe)Tsh e
s3lwu :4f
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 @#b0T:+v'
mg+k'Myo+
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ~HUZ#rUHm>
9 K
。 )3muPMaY
$
A-b vL
分页支持类: F}rPY:
4W\,y_Q o
java代码: ]Bb7(JX
\w)?SVp
GG'Sp53GE
package com.javaeye.common.util; N^elVu4 K
2neRJ
import java.util.List; CYB=Uq,
K:qOoY
publicclass PaginationSupport { 8gmn6dCf
eZO9GMO
publicfinalstaticint PAGESIZE = 30; s5Fr)q// !
FyEDt@J
privateint pageSize = PAGESIZE; %N~CvN@T
VVrwOoCN
privateList items; n'64;J5
Q59/ex
privateint totalCount; Bx X$5u
hZNEv|
privateint[] indexes = newint[0]; Plz-7fy33
qCJ=Z
privateint startIndex = 0; ~Y/z=^
o G_~3Kt
public PaginationSupport(List items, int ~B@}R
cq^sq1A:
totalCount){ wt7.oKbW
setPageSize(PAGESIZE); Xn7[n
setTotalCount(totalCount); +6%7CC 6
setItems(items); l6B.6
'4)w
setStartIndex(0); T~Y g5J
} W<gD6+=8
TJ2/?p\x
public PaginationSupport(List items, int iiwpSGFl]
uaQ&&5%%J
totalCount, int startIndex){ h1%y:[_
setPageSize(PAGESIZE); ?\yB)Nd y
setTotalCount(totalCount); \!X?zR_
setItems(items); j3P RAe
setStartIndex(startIndex); Rx.
rj~
} tm xP Oe
BpXEK.Xw
public PaginationSupport(List items, int rr>~WjZ3
S.fXHtSx
totalCount, int pageSize, int startIndex){ ti;%BS
setPageSize(pageSize); _XN~@5elrC
setTotalCount(totalCount); F|]rA*2u
setItems(items); 9c5!\m1
setStartIndex(startIndex); oBUh]sR{.
} d x359
x9*ys;~w
publicList getItems(){
g@(30{
return items; CB@B.)E
} |,fh)vO
x[m'FsR4
publicvoid setItems(List items){ T^.{9F]*S
this.items = items; $wXih#7
} fle0c^ =
\2eFpy(
publicint getPageSize(){
'O1.6*K
return pageSize; )n7)}xy#z
} 'o8\`\'H!
Gt.*_E
publicvoid setPageSize(int pageSize){ |7S:l9;
this.pageSize = pageSize; F9D"kG;Dk
} xhD$e=
g
qi[(*bFK7
publicint getTotalCount(){ 'Fzuc^G(d
return totalCount; 5k`e^ARf
} s#Q_Gu
LsotgQ8
publicvoid setTotalCount(int totalCount){ >\-3P$
if(totalCount > 0){ Hrv),Ce
this.totalCount = totalCount; wL|7mMM,
int count = totalCount / hd=j56P5P
= P8~n2V
pageSize; <\xQ7|e
if(totalCount % pageSize > 0) @{de$ODu
count++; lvig>0:M
indexes = newint[count]; G\IocZ3Gz
for(int i = 0; i < count; i++){ EreAn
indexes = pageSize * iDvpXn
bn|DRy
i; A@{ !:_55
} ][N) 2_^M
}else{ /op/g]O}
this.totalCount = 0; RQJ9MGw
} .hnF]_QQ
} l2M/,@G
;W4:#/~14
publicint[] getIndexes(){ a:xgjUt&5
return indexes; V?WMj
$l<
} 4jD\]Q="1
%1@.7uTN
publicvoid setIndexes(int[] indexes){ 0<"tl0p_
this.indexes = indexes; :=B[yD!
} nR#a)et
a#6,#Q"
publicint getStartIndex(){ A9.;>8!u
return startIndex; {9,R@>R
} 8s&2gn1
_.hIv8V
publicvoid setStartIndex(int startIndex){ i&B?4J)
if(totalCount <= 0) T7X!#j"\
this.startIndex = 0; EXH!glR[$
elseif(startIndex >= totalCount) 2tlO"c:_/
this.startIndex = indexes 'NRN_c9
G:){^Z?
[indexes.length - 1]; -<12~HKK::
elseif(startIndex < 0) -{r!M(47
this.startIndex = 0; aSxG|OkKy
else{ Ny[s+2?
this.startIndex = indexes "Vq@bNtu+
y>&VtN{E
[startIndex / pageSize]; )<tzm'Rc
} 8:BQHYeJK
} oO}>i0ax*
X$ejy/+.
publicint getNextIndex(){ s:G[Em1
int nextIndex = getStartIndex() + gx&\Kw6HM
CJtr0M<U+
pageSize; \_)02ZT:
if(nextIndex >= totalCount) ]r]+yM|
return getStartIndex(); -y9Pn>~V
else Ed8U;U b
return nextIndex; fa/P%9db
} C!oksI
Rb yF#[}
publicint getPreviousIndex(){ |^\Hv5
int previousIndex = getStartIndex() - ``/y=k/au
?cA8P.?^A
pageSize; CD$u=E
]
if(previousIndex < 0) /7S-|%1
return0; oa?!50d
else x*k65WO\
return previousIndex; Pi^ECSzQu[
} 8dYk3sk
FL5ibg
} D;K&
&P{o{
I}I}K~se*
@)S sKk|
抽象业务类 zT2F&y
q
java代码: P((S2"D<4
19pND
m2H1
(bM)Nd
/** IH*U!_ `
* Created on 2005-7-12 y_;]=hEL
*/ m7weR>aS4
package com.javaeye.common.business; A)~/~
0#2T0zk
import java.io.Serializable; :4Id7Ce
import java.util.List; _wIBm2UO
&*LA_]1@
import org.hibernate.Criteria; d8VWi*
import org.hibernate.HibernateException; YY1{v?[
import org.hibernate.Session; [w+yQ7P
import org.hibernate.criterion.DetachedCriteria; 9;r48)5
import org.hibernate.criterion.Projections; u)N2
import ptnMCF
sj?`7kg
org.springframework.orm.hibernate3.HibernateCallback; A8CIP:Z
import V!j K3vc
}D&"z8mP
org.springframework.orm.hibernate3.support.HibernateDaoS .`i'gPLkn2
,'/HcF?yf
upport; IF,i^,
S&gKgQD"Q
import com.javaeye.common.util.PaginationSupport; nph7&[xQI
:e5:\|5*5
public abstract class AbstractManager extends z_)OWWdN
>e5q2U
HibernateDaoSupport { ^!-E`<jW8
tU-#pB>H
privateboolean cacheQueries = false; ui0J}DM
z&6]vN'
privateString queryCacheRegion; n0>5'm%ES
YL0WUD_>
publicvoid setCacheQueries(boolean 1( QWt
E.En$'BvB
cacheQueries){ gdkLPZ<<
this.cacheQueries = cacheQueries; QSl:=Q'
} qcpG}o+&D
~jgN_jz
publicvoid setQueryCacheRegion(String oX=*MEfX
|e.3FjTH
queryCacheRegion){ QI
:/,w
this.queryCacheRegion = !=k*hl0h
n9mM5H47
queryCacheRegion; 4jq`No_
} 9~Y)wz
f<$K.i
publicvoid save(finalObject entity){ Y3sNr)qss
getHibernateTemplate().save(entity); :_I
wc=
} X=*Yzz}
Sl+jduc
publicvoid persist(finalObject entity){ OLd$oxKR
getHibernateTemplate().save(entity); ~Q{[fy=
} !)l%EJngL
z_[3IAZ
publicvoid update(finalObject entity){ hhh: rmEZl
getHibernateTemplate().update(entity); af`f*{Co3
} 0qotC6l~_w
_z"ci$[
publicvoid delete(finalObject entity){
5K_N
getHibernateTemplate().delete(entity); sEgeS9a{
} p8}5x 2F
f;_K}23
publicObject load(finalClass entity, 1,*Z_ F=y
1Q2k>q8
finalSerializable id){ EFT02#F_f
return getHibernateTemplate().load ,*O{jc`(
WMdz+^\(
(entity, id); <or>bo^
} {XVf|zM,
;)bF#@Q
publicObject get(finalClass entity, GmEJ,%A
g)zn.]
finalSerializable id){ eA~_)-Z-
return getHibernateTemplate().get eiNk]KXAYX
h#6 jUQ
(entity, id); NIXc ib"tG
} (VF4FC
V~gUMu4ot
publicList findAll(finalClass entity){ ZF11v(n
return getHibernateTemplate().find("from #k|g9`
}IalgQ(i
" + entity.getName()); _UVX
} |
xErA
C\hZ;Z1
publicList findByNamedQuery(finalString k0Vo
LBiv]3
namedQuery){ "n2xn%t{
return getHibernateTemplate ?#{2?%_
T\$^>@
().findByNamedQuery(namedQuery); LF3GVu,
} N6m*xxI{
(
_F
publicList findByNamedQuery(finalString query, lDX&v$
{0Ol/N;|D
finalObject parameter){ ~%!U,)-
return getHibernateTemplate GXvo't@N
f'?6D+Yw~
().findByNamedQuery(query, parameter); 9 %.<V_$
} yZPFo
K:mL%o2J
publicList findByNamedQuery(finalString query, 6@_@nlA<1
0g*r!aa
finalObject[] parameters){ ;?L[]Ezzt
return getHibernateTemplate aK=3`q
4`'BaUU(
().findByNamedQuery(query, parameters); %` uRUex
} 7.1E mJ
V2sB[Mw
publicList find(finalString query){ k`J..f9
return getHibernateTemplate().find \kJt@ [w%
3M:B?2
(query); '>lPq tdZ
} (P52KD[A[
Ok{:QA~#
publicList find(finalString query, finalObject _F$t#.o
$8yGY
parameter){ CR|&VxA
return getHibernateTemplate().find kjKpzdbD
JgjL$n;F
(query, parameter); *t-A6)2
} hZ /
Gy Xs{*
public PaginationSupport findPageByCriteria 5]n<%bP\
!Pjg&19
(final DetachedCriteria detachedCriteria){ +Gwe%p Q
return findPageByCriteria uJ5%JB("E
UFY~D"%/
(detachedCriteria, PaginationSupport.PAGESIZE, 0); ZK_@.O+ ]
} =&g}Y
H2R^t{w
public PaginationSupport findPageByCriteria GbrPtu2{@V
~9'4w-Sy
(final DetachedCriteria detachedCriteria, finalint D"XQ!1B%
ii]=C(e9
startIndex){ #WmAkzvq
return findPageByCriteria t=\[J+
b)`#^uxxJ
(detachedCriteria, PaginationSupport.PAGESIZE, 9h0,L/;\
rZCAj
startIndex); X\)KVn`
} E#F9<=mA)
98BBsjkd
public PaginationSupport findPageByCriteria #yRA.;
G?1V~6
(final DetachedCriteria detachedCriteria, finalint D$!p+Q
+T-zf@j
pageSize, |l \/ {F
finalint startIndex){ lJ1xx }k{U
return(PaginationSupport) Tq_X8X#p
K1{nxw!`
getHibernateTemplate().execute(new HibernateCallback(){ 'oeg[
publicObject doInHibernate zc~xWy+
Vwg|? sG_
(Session session)throws HibernateException { Lj* =*V
Criteria criteria = !!X9mI|2|
teNQUIe-
detachedCriteria.getExecutableCriteria(session); bRe *(
int totalCount = Saq>o.
Dj&bHC5%
((Integer) criteria.setProjection(Projections.rowCount
KGwL09)
?D 9#dGK
()).uniqueResult()).intValue(); |a:VpM
criteria.setProjection Uht:wEr
UNLNY,P/!)
(null); 0g uc00IN
List items = .wOLi Ms
JkDZl?x5
criteria.setFirstResult(startIndex).setMaxResults 'Mhdw}
t SLl'XeN
(pageSize).list(); V>j`
PaginationSupport ps = f9=X7"dzP
&fhurzzAm
new PaginationSupport(items, totalCount, pageSize, ]8nm9qmF<
e>9{36~jh
startIndex); !td.ks0
return ps; _llaH
} l'8TA~
}, true); =QO[zke:
} NJ!#0[@C
Dk6\p~q
public List findAllByCriteria(final MQMy Z:
>gLyz2
DetachedCriteria detachedCriteria){ i4Cb&h^
return(List) getHibernateTemplate QjbPBk Q
BCB/cBE
().execute(new HibernateCallback(){ <a}|G1 h
publicObject doInHibernate zd]L9 _
ghR]$SG
(Session session)throws HibernateException { fB}5,22
Criteria criteria = 'ZgW~G]S
;//qjo
detachedCriteria.getExecutableCriteria(session); )L("t
return criteria.list(); U>jk`?zW
} 3;gtuqwD$
}, true); [zd-=.:+M[
} /s_$CSiB
)F2tV ]k\
public int getCountByCriteria(final `3s-\>
Io X9yGq
DetachedCriteria detachedCriteria){ BV:,bS
Integer count = (Integer) >{=RQgGy
YAG3PWmD
getHibernateTemplate().execute(new HibernateCallback(){ Z6ex<[`I
publicObject doInHibernate ?kefRev<#h
R6.#gb8^oS
(Session session)throws HibernateException { Q'M Ez
Criteria criteria = 3!UP>,!
?q&mI* j!
detachedCriteria.getExecutableCriteria(session); ~[,TLg
6
return ;$;/#8`>
+ zPg`/
criteria.setProjection(Projections.rowCount EmoU7iy
$^ 3 f}IzA
()).uniqueResult(); v> PHn69PU
} e-t`\5b;
}, true); tqC#_[~7
return count.intValue(); dK$dQR#
} U2u>A
r
} oABPGyv
l'f!za0
!+l,
m8Hly
TC}u[kM
'FXZ`+r|
_/\H3
用户在web层构造查询条件detachedCriteria,和可选的 Y>~zt -
cK@K\AE
startIndex,调用业务bean的相应findByCriteria方法,返回一个 7!)%%K.z6
:M`BVZ1t
PaginationSupport的实例ps。 "VCr^'
Ry~LhU:
ps.getItems()得到已分页好的结果集 7QFEQ}
ps.getIndexes()得到分页索引的数组 ,FO|'l
ps.getTotalCount()得到总结果数 je%12DM
ps.getStartIndex()当前分页索引 =?aB@&
ps.getNextIndex()下一页索引 __npX_4%S
ps.getPreviousIndex()上一页索引 #O
]IXo(5z
(k45k/PAP
-6>rR{z
r&RSQHa)
.[A S
=0Sa
Z2}b1#U?
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 r2w7lf66!
[%Xfl7;Wh
,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 9$i`B>C~
$
7!GA9Bn
一下代码重构了。 5}ah%
Dh<e9s:
我把原本我的做法也提供出来供大家讨论吧: T]`"
Xl8
(5
hu
W7v
首先,为了实现分页查询,我封装了一个Page类: XPKcF I=
java代码: (
PlNaasV
`6su_8Hno
"(GeW286k
/*Created on 2005-4-14*/ w ?aLWySYT
package org.flyware.util.page; (H^o8J
LPF?\mf ^4
/** UPF=X)!M
* @author Joa O:)@J b2
* _aYQ(FO
*/ 2ra4t]f6
publicclass Page { hI0l2OE
`Fr$q1qae{
/** imply if the page has previous page */ i=@*F$,
privateboolean hasPrePage; zZ-*/THB@R
n9 DFa3
/** imply if the page has next page */ Tr)[q>
privateboolean hasNextPage; RqR X
{wySH[V
/** the number of every page */ g=Jfp$*[
privateint everyPage; &baY[[N
6WZp&pO
/** the total page number */ P])O\<)J
privateint totalPage; K~R{q+
C/G[B?:h
/** the number of current page */ "H8N,eb2
privateint currentPage; J.d<5`7
{rQ`#?J}^?
/** the begin index of the records by the current 8wOPpdc
wC~Uy%
query */ _45"Z}Zx
privateint beginIndex; `N+ P,
10(N|2'q
uQCS%|8C
/** The default constructor */ ]LjW,b"
public Page(){ Re_.<_$
t|%ul6{gz
} PH.v3
3K
=UN:IzT
/** construct the page by everyPage f{0PLFj
* @param everyPage |>)mYLN!y
* */ J5wq}<8
public Page(int everyPage){ Zh*I0m
this.everyPage = everyPage; w'C(? ?mH
} FU zY&@Y
?FyA2q!
/** The whole constructor */ \Uiw:
,
public Page(boolean hasPrePage, boolean hasNextPage, +FI]0r
$v,_8{ !
xp=
]J UQ
int everyPage, int totalPage, n7vi@^lf(
int currentPage, int beginIndex){ hdzaU&w
this.hasPrePage = hasPrePage; p6p_B
this.hasNextPage = hasNextPage; hI$an%Y(
this.everyPage = everyPage; A]1](VQ)4
this.totalPage = totalPage; ,b{4GU$3
this.currentPage = currentPage; <pCZ+Yv E"
this.beginIndex = beginIndex; 3f0RMk$pH
} ~9=g" v
V.qB3V$
/** %y'#@%kO:S
* @return WD<M
U ]
* Returns the beginIndex. ET4YoH>
*/ S"*wP[d.9
publicint getBeginIndex(){ zKo,B/Ke4
return beginIndex; 6Y=)12T
} i{.!1i:
HzV3O-Qz]
/** K7|BXGL8r8
* @param beginIndex 6;Bqu5_Cj
* The beginIndex to set. %5b2vrg~*
*/ -4.+&'
publicvoid setBeginIndex(int beginIndex){ _
._'\
this.beginIndex = beginIndex; U:H*b{`TU
} pnWDsC~)
~O!v?2it8q
/** 0[^f9NZ>-
* @return ^VD14V3
* Returns the currentPage. ;-59#S&?tB
*/ 2]|+.9B
publicint getCurrentPage(){ sNWj+T
return currentPage; 92EvCtf
} R"jX9~3Ln
$4m{g"xL
/** z?7pn}-
* @param currentPage t2>Vj>U
* The currentPage to set. BO^e.iB/
*/ c8h
9
publicvoid setCurrentPage(int currentPage){ /) N[tv2
this.currentPage = currentPage; ;tO (,^
} IsI\T8yfc
xGjEEBL
/** [dL#0~CL$
* @return rLVS#M#&e>
* Returns the everyPage. /J^yOR9
*/ O3S_P]{*ny
publicint getEveryPage(){ mU;TB%#)
return everyPage; yA~W|q(/V
} N7XRk=J
Y:O%xtGi
/** {=TD^>?
* @param everyPage "~tEmMz
* The everyPage to set. L49`=p<
*/ }JS?42CTaV
publicvoid setEveryPage(int everyPage){ xRb-m$B}L
this.everyPage = everyPage; E=7~\7TE
} ^j@,N&W:lG
<S<(wFE@4
/** @#nB]qV:e
* @return h/d&P
* Returns the hasNextPage. bx1'
*/ o}<}zTU
publicboolean getHasNextPage(){ S>nM&758
return hasNextPage; -YD6
} VK8 5A
e tY9Pq
/** WSL_Dc
* @param hasNextPage tR1
kn&w
* The hasNextPage to set. N]gdS]pP2{
*/ .pZwhb
publicvoid setHasNextPage(boolean hasNextPage){ ?_IRO|
this.hasNextPage = hasNextPage; fn)c&|aCt
} mjfU[2
MbYAK-l.h
/** 6#v"+V
* @return ZhW>H
* Returns the hasPrePage. ))<3+^S0V\
*/ 7cH[}v`pn
publicboolean getHasPrePage(){ %c):^;6p
return hasPrePage; ]*?qaIdqu
} |:C=j/f
!ce:S!P
/** 1qtu,yIf
* @param hasPrePage in$Pk$ c
* The hasPrePage to set. X2~>Z^,
U
*/ XDU&Z2A
publicvoid setHasPrePage(boolean hasPrePage){ C*=#=.~~{
this.hasPrePage = hasPrePage; KnKV+:"
} 7Q2"]f,$CQ
"YM)bc
/** 52=?!
JM
* @return Returns the totalPage. 49cQA$Ad
* <^{|5u
*/ |d&a&6U:
publicint getTotalPage(){ *22}b.)
return totalPage; >zVj+
} QOMh"wC3
GHfsq|*j,Z
/** UT%^!@u
* @param totalPage 7*`cWT_X
* The totalPage to set. t0(1qFi
*/ 5^+>*z
publicvoid setTotalPage(int totalPage){ ;CD@RP{$n
this.totalPage = totalPage; gq!|0
} 1d,;e:=j
hT]\*},
} X0O@,
#}3$n/
WbB0{s
+Ccj@#M;
6"b =aPTi
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 @#xh)"}
A46Xei:Ow
个PageUtil,负责对Page对象进行构造: f
0D9Mp
java代码: _ 7X0
[kaj8
r$<[`L+6
/*Created on 2005-4-14*/ 1 :<f[l
package org.flyware.util.page; 8SR ~{
r&U