Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 .Cwgl
O4dJ> O
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 W_8N?coM
YzNSZJPD
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 * G!C 'w\$
t2uX+1F
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 -|YG**i/
Ii FeO
。 o'O;69D]tX
Cdg/wRje
分页支持类: DybuLB$f
P|%uB'|H
java代码: Dukvi;\
!tJQ75Hwv
;5Spdi4w
package com.javaeye.common.util; k+b!Lw!L
~
"Xcd8:
import java.util.List; &m[ZpJ9
BQTZt'p
publicclass PaginationSupport { = Lt)15
-|V1A[
publicfinalstaticint PAGESIZE = 30; AQ+MjS,
?"04u*u3
privateint pageSize = PAGESIZE; ?i'N9 /(
5argw+2s4$
privateList items; NhJ]X cfP8
5XtIVHA@{
privateint totalCount; ;&7dX^oH
~(aMKB
privateint[] indexes = newint[0]; qHVZsZ
BPO)<bx_
privateint startIndex = 0; hvW FzT5
r c++c,=
public PaginationSupport(List items, int F^4mO|
tBUn
KPT
totalCount){ }Um,wY[tK
setPageSize(PAGESIZE); Uzh#zeZ`<
setTotalCount(totalCount); *{y({J
setItems(items); =1#obB
setStartIndex(0); (>]frlEU~
} {:;6 *W
VN3[B
eH
public PaginationSupport(List items, int nMM:Tr
aFw \w>*^
totalCount, int startIndex){ @=<B8VPJd
setPageSize(PAGESIZE); h4ozwVA
setTotalCount(totalCount); ^O6eFD U
setItems(items); +-X
68`
setStartIndex(startIndex); 6+UTEw;
} 4yK{(!&i+
m+|yk.md
public PaginationSupport(List items, int B)/L[ )S
h;[<4zw
totalCount, int pageSize, int startIndex){ h-.xx4D
setPageSize(pageSize); 56JxHQu
setTotalCount(totalCount); l4bLN
setItems(items); i2P:I A|@
setStartIndex(startIndex); H|)F-aL[
} G!)Q"+
$sxRRem{?
publicList getItems(){ eC{St0
return items; 3p1U,B}
} .QU]
2WK c;?
publicvoid setItems(List items){ C;3
this.items = items; ^>/~MCyM.
} ;,lFocGv
i&TWIl8
publicint getPageSize(){ tdsfCvF=a
return pageSize; :u]QEZ@@
} D_q"|D$SB
7v&>d,
publicvoid setPageSize(int pageSize){ LzTdi%u$0|
this.pageSize = pageSize; 8'PK}heBU
} w2SN=X~#
!o`riQLs>
publicint getTotalCount(){ hnimd~E52k
return totalCount; D"msD"
} [*J?TNk
]f~!Qk!I7r
publicvoid setTotalCount(int totalCount){ gNJdP!(t
if(totalCount > 0){ $[g#P^
this.totalCount = totalCount; !]3kFWs
int count = totalCount / a>Wr2gPko
p\P)
pageSize; $0gGRCCG;
if(totalCount % pageSize > 0) T65"?=<EB
count++; G0A\"2U
indexes = newint[count]; "$/1.SX;]
for(int i = 0; i < count; i++){ fg7
indexes = pageSize * Zts1BWL[
M._;3_)%/
i; LJ6L#es2
} U.WXh(`%
}else{ a!EW[|[Q
this.totalCount = 0; F`La_]f?b\
} $V !25jQ
} o%!s/Z1
I7W`\d)
publicint[] getIndexes(){ n[B[hAT
return indexes; S17;;w0
} c^r WS&)P
)HcLpoEi
publicvoid setIndexes(int[] indexes){ VsJKxa4
this.indexes = indexes; &2Ef:RZF
} b0/YX@
7GTDe'T
publicint getStartIndex(){ .C.b5x!
return startIndex; n.i8?:
} ]j!pK4
/M JI^\CA
publicvoid setStartIndex(int startIndex){ L?Ys(a"k
if(totalCount <= 0) 4JyA+OD4 {
this.startIndex = 0; ~%2yDhdQ
elseif(startIndex >= totalCount) UM`{V5NG#
this.startIndex = indexes ~<-mxOe
{\vVzy,t7
[indexes.length - 1]; /OYa1,
elseif(startIndex < 0) @q`T#vd
this.startIndex = 0; 0@[*~H0{n
else{ Y9gw
('\w
this.startIndex = indexes D.-G!0!
AusjN-IL
[startIndex / pageSize]; w3 kkam"
} %%/8B
} 9^9-\DG
&4+|{Zx0
publicint getNextIndex(){ zVa&4 T-
int nextIndex = getStartIndex() + }n
"5r(*^@
a#{"3Z2|
pageSize; Aix6O=K6
if(nextIndex >= totalCount) `qYiic%
return getStartIndex(); /G|v.#2/g
else 0}"\3EdAbD
return nextIndex; =36fS/Gb
} AorY#oq
SO.u0!
publicint getPreviousIndex(){ `U b*rOMu
int previousIndex = getStartIndex() - Y 9|!=T%
kz1#"8Zd!
pageSize; /t<
&
if(previousIndex < 0) M.6uWwzQR
return0; %)r:!R~R
else _"Z?O)d*
return previousIndex; lVQE}gd%m
} Y<u%J#'[
!tt 8-Y)i
} %\(-<aT
Zs{7km
K#N9N@W jR
6r`N\ :18
抽象业务类 mI!iSVqr
java代码: sT"ICooc
~nhO*bs}7{
u:lBFVqk
/** OdZ/ \_Z
* Created on 2005-7-12 )DhE~
*/ br
Iz8]
package com.javaeye.common.business; fv#ov+B
YJMs9X~3
import java.io.Serializable; W4&8
import java.util.List; Pj]^p{>
f|M^UHt8*
import org.hibernate.Criteria; zn 0y`9!n?
import org.hibernate.HibernateException;
Z^2SG_pD
import org.hibernate.Session; xT_"` @
import org.hibernate.criterion.DetachedCriteria; 1HKA`]D"p
import org.hibernate.criterion.Projections; vD9\i*\2
import Jk-WD"J6
:d9GkC
org.springframework.orm.hibernate3.HibernateCallback; MKvmzLh$)
import f.uuXK
]
1pIIX}
org.springframework.orm.hibernate3.support.HibernateDaoS D.:`]W|
C5-u86F
upport; jvsSP?]n
\Db;7wh
import com.javaeye.common.util.PaginationSupport; & ;.rPU
iB(?}SaAZ
public abstract class AbstractManager extends j@(S7=^C6%
hBX.GFnw
HibernateDaoSupport { Ar~/KRK
U ->vk{v
privateboolean cacheQueries = false; ^8~TsK~
hWbu
Z%
privateString queryCacheRegion; ]gVA6B?&9
rgCC3TX
publicvoid setCacheQueries(boolean MbCz*oW
Yb5@W/'
cacheQueries){ &odQ&%X
this.cacheQueries = cacheQueries; Y\_mqd
} ! PGCoI
]}].Aq
publicvoid setQueryCacheRegion(String {$[0YRNk
u
4y+hr
queryCacheRegion){ -M6vg4gf
this.queryCacheRegion = 0'r}]Mws
Z{B [r;
queryCacheRegion; iUh7eR9
} fgtwVji
[ _xOz4`%
publicvoid save(finalObject entity){ !gLJBp
getHibernateTemplate().save(entity); =Xr{ Dg
} _){u5%vv
,?j!c*
publicvoid persist(finalObject entity){ i: UN
getHibernateTemplate().save(entity); |>U<EtA"
} "~=}&
HI D6h!
publicvoid update(finalObject entity){ 8M!9gvcaO
getHibernateTemplate().update(entity); tQ;Fgv8Y!
} 4%nK0FAj
D&mPYxXL
publicvoid delete(finalObject entity){ 8b,Z)"(U3
getHibernateTemplate().delete(entity); :jTbzDqQ
} jzDPn<WQ
fy>3#`T-
publicObject load(finalClass entity, Y(rQ032s
Bt:M^b^
finalSerializable id){ %iIr %P?
return getHibernateTemplate().load r\b$/:y<e
M-QQ
(entity, id); {yf,:5
} C;ha2UV0H
T[},6I|!
publicObject get(finalClass entity, NODE`VFu
,82?kky
finalSerializable id){ 7[ kDc-
return getHibernateTemplate().get k~<ORnda
!_o1;GzK
(entity, id); QB*AQ5-
} }/NL"0j+4
q}JP;p(#
publicList findAll(finalClass entity){ #c<F,` gdi
return getHibernateTemplate().find("from 2+(SR.oGq
1?p:66WmR
" + entity.getName()); M _Lj5`
} 8.`5"9Vh
Hn)^C{RN*{
publicList findByNamedQuery(finalString LwQYO'X
G"yhu +
namedQuery){ C0e oV}
return getHibernateTemplate 0F 4%Xz
@DR?^
q p
().findByNamedQuery(namedQuery); ir)~T0
} ]ao%9:P;
%`dVX
EO
publicList findByNamedQuery(finalString query, 8+_e= _3R
]mO7O+
finalObject parameter){ =p!Hl#
return getHibernateTemplate PTA_erU
F,GG>(6c
().findByNamedQuery(query, parameter); y7 W7270)
}
)Oj%3
*zPz)3;
publicList findByNamedQuery(finalString query, N*hx;k9
j =b-Y
finalObject[] parameters){ P<xCg
return getHibernateTemplate +JFE\>O
M059"X="
().findByNamedQuery(query, parameters); `~W ?a
} fJG!TQJ[Y
llBW*4'
publicList find(finalString query){ <m?/yREK2
return getHibernateTemplate().find _
<pO<S
uchz<z1
(query); pB]+c%\
} ->YF</I
71yf+xL
publicList find(finalString query, finalObject 5./(n7d_
&uTK@ G+
parameter){ |S VL%agZ
return getHibernateTemplate().find Q(YQ$i"S
F1zsGlObu}
(query, parameter); _Nq7_iT0
} 4^BHJOvs
+D+Rf,D
public PaginationSupport findPageByCriteria #v4q:&yKf
K0?:?>*b#
(final DetachedCriteria detachedCriteria){ K~>ESMZ5
return findPageByCriteria wS1zd?
!"x&tF
(detachedCriteria, PaginationSupport.PAGESIZE, 0); -r"h[UV)
} 2l!* o7
-}*YfwK
public PaginationSupport findPageByCriteria ZzuWN&
4m$Xjj`vE
(final DetachedCriteria detachedCriteria, finalint u~^d5["T
onAC;<w
startIndex){ :s OsG&y
return findPageByCriteria dg]: JU
G+xdh
(detachedCriteria, PaginationSupport.PAGESIZE, 4#y
Od:,r
startIndex); !G3d5d2)C
} ENi@R\
p
CwVORf,uA
public PaginationSupport findPageByCriteria :|?nz$
2aUy1*aM
(final DetachedCriteria detachedCriteria, finalint r|tTDKGQ
r8E)GBH-|
pageSize, ]2P*Z6Az
finalint startIndex){ eO:wx.PW
return(PaginationSupport) Z>H
y+Q4
^B|Q&1
getHibernateTemplate().execute(new HibernateCallback(){ ?xuhN
G@
publicObject doInHibernate l4sFT)}-J
,D`iV| (
(Session session)throws HibernateException { 2& l~8,
Criteria criteria = "NamP\hj
]D;X"2I2'b
detachedCriteria.getExecutableCriteria(session); 4j'cXxo
int totalCount = Y&Sk/8
VSlIeZ
((Integer) criteria.setProjection(Projections.rowCount A%pBvULH
|h; _r&
()).uniqueResult()).intValue(); E$'Zd,|f=
criteria.setProjection Q~A25Jf.
ljij/ C=
(null); HNRZ59Yyq
List items = ;U=RV&
yqm^4)Dp
criteria.setFirstResult(startIndex).setMaxResults 2%'iTXF
m|)Mc VV
(pageSize).list(); lIg;>|'Z5&
PaginationSupport ps = y%21`y&Os
^hhJ6E_W
new PaginationSupport(items, totalCount, pageSize, R)3P"sGuN
ESl-k2
startIndex); >+w(%;i;
return ps; s^]F4'
} hDp
-,ag{
}, true); 8#9di
} _Kp{b"G
J3oj}M*
public List findAllByCriteria(final "-'w,g
Sxrbhnx
DetachedCriteria detachedCriteria){ ^gwVh~j
return(List) getHibernateTemplate 0pWF\<IZ
o!`.LL%
().execute(new HibernateCallback(){ (=d%Bn$6b
publicObject doInHibernate S(^*DV
>g]S"ku|
(Session session)throws HibernateException { #HD$=ECcw
Criteria criteria = jJc?/1 jv
$z!o&3c'x
detachedCriteria.getExecutableCriteria(session); QfuKpcT&
return criteria.list(); %t&5o>1C
} E>tlY&0[$
}, true); ;F@N2j#
} #:{Bd8PS
$6~D 2K
public int getCountByCriteria(final }+KSZ,
&D
"$N"
DetachedCriteria detachedCriteria){ }JXAG/<
Integer count = (Integer) `p@YV(
f?wn;;z`
getHibernateTemplate().execute(new HibernateCallback(){ )1%l$W
publicObject doInHibernate [HJ^'/bB'
=@U~sl[
(Session session)throws HibernateException { opQ%!["N
Criteria criteria = DBuvbq-
| I_,;c
detachedCriteria.getExecutableCriteria(session); =.9L/74@
return `+[e]dH
Y/1KvF4)k
criteria.setProjection(Projections.rowCount A"t~
)
*ip2|2G$
()).uniqueResult(); CzKU;~D=B
} :- B,Q3d
}, true); =W(mZ#*vdY
return count.intValue(); f>k<I[C<
} [:-Ltfr
} ) -+u8#
[A?Dx-R;(
1b:3'E.#w
" (c#H
A;nrr1-0
L~_3BX
用户在web层构造查询条件detachedCriteria,和可选的 ;Wa4d`K
8RJXY:%
startIndex,调用业务bean的相应findByCriteria方法,返回一个 tMxa:h;/x
w=.w*?>
PaginationSupport的实例ps。 3.M<ATe^
J0BA@jH5
ps.getItems()得到已分页好的结果集 USLG G}R
ps.getIndexes()得到分页索引的数组 "
N)dle,
ps.getTotalCount()得到总结果数 b/IT8Cm3
ps.getStartIndex()当前分页索引 SoZ$1$o2
ps.getNextIndex()下一页索引 ]J;pUH+u
ps.getPreviousIndex()上一页索引 Y !e
5)fEs.r0U
}%_h|N
MP/6AAt7=|
HvSKR1wL\
= h,6/cs
aIV(&7KT4
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 mM.-MIp
[)V&$~xW
,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 !=j\pu}
Z
NF`WA-W8@
一下代码重构了。 Rg3 Lo ?
BX :77?9,+
我把原本我的做法也提供出来供大家讨论吧: c,%9Fh?(
1"J\iwN3
首先,为了实现分页查询,我封装了一个Page类: et|QW;*L
java代码: rYUhGmg`
5MsE oLg
7Io]2)V
/*Created on 2005-4-14*/ AfmGA9
package org.flyware.util.page; *sI`+4h[
V?U->0>Z4
/** $
2'AY
* @author Joa '`g#Zo
* l]Ozy@
Ib
*/ .]+Z<5Fo
publicclass Page { 2Qg.b-C
&9bsTm
/** imply if the page has previous page */ 2Cd#~
privateboolean hasPrePage; Bw2-4K\"kc
-QR&]U+
/** imply if the page has next page */ ;O=tSEe
privateboolean hasNextPage; a f[<[2pma
90OSe{
/** the number of every page */ \tf \fa
privateint everyPage; <4,hrx&.
GKf,1kns
/** the total page number */ m89-rR:Kc
privateint totalPage; 3=w$1.B d
u,i~,M
/** the number of current page */ y.6D Z
privateint currentPage; j'Ry.8}
]i'hCa $$
/** the begin index of the records by the current a4HUP*
M\5aJ:cQ+
query */ *nUD6(@g
privateint beginIndex; ql,k 5.l
#"{wm
4%L`~J4 wr
/** The default constructor */ 3 @XkO
public Page(){ 1eue.iuQ
.&O}/B
} wc7gOrPpm
TVVL1wZ
/** construct the page by everyPage 7b7~D +b
* @param everyPage N"d
M+
* */ 'TWZ@8h~
public Page(int everyPage){ aewVq@ngq!
this.everyPage = everyPage; W]E6<y'
} P]]re,&R
!1
:%!7
/** The whole constructor */ Le#>uWM
public Page(boolean hasPrePage, boolean hasNextPage, MVdX
rro92(y
``*iK
int everyPage, int totalPage, O_%X>Q9
int currentPage, int beginIndex){ $ M?VJ\8
this.hasPrePage = hasPrePage; #-S%aeB
this.hasNextPage = hasNextPage; d{^9` J'
this.everyPage = everyPage; N!R>L{H>
this.totalPage = totalPage; \;&WF1d`ac
this.currentPage = currentPage; ug]WIG7 S
this.beginIndex = beginIndex; _P6e%O8C#
} lu~<pfg
s~N WJ*i
/** \09m
?;^
* @return BYj Eo
* Returns the beginIndex. HRX}r$
*/ ~>8yJLZ.7
publicint getBeginIndex(){ TmI~P+5w
return beginIndex; 9!CD25u
} }>`rf{T
h-)tWJ c
/** }<m'Nkz<X
* @param beginIndex AlZ]UGf^
* The beginIndex to set. 4:1URhE
*/ v6uXik
publicvoid setBeginIndex(int beginIndex){ Tj0qq .
this.beginIndex = beginIndex; p7H0|>
} 7$"{&