Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 /iL*)
. I."q
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 %/d1x
tns4 e\
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 }qR6=J+Dx
EMDYeXpV
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 211V'|a_>
G=LK
irj(
。 <`?%Cz AO
\uO^wJ}
分页支持类: =2YXh,i
=&<d4'(Qk
java代码: AY;[v.Ff4
IG:2<G
]<K"`q2
package com.javaeye.common.util; bz1AmNZG
1vS-m x
import java.util.List; t*)!BZ
8m?cvI
publicclass PaginationSupport { B4 5#-V
`2]TPaWGh
publicfinalstaticint PAGESIZE = 30; >nvnU`\
y(#6nG@S
privateint pageSize = PAGESIZE; @(0O9L
F
{ `xC~B h
privateList items; 7 fXJP5j
:F9Oj1lM%
privateint totalCount; SbQ:vAE*ho
C XNYWx
privateint[] indexes = newint[0]; X\>/'fC$
Yh Ow0 x
privateint startIndex = 0; /`0>U
sk*vmxClY
public PaginationSupport(List items, int RS@[ +! :t
0{XT#H
totalCount){ 6 !N2B[9
setPageSize(PAGESIZE); y7R=zkd
C9
setTotalCount(totalCount); !Rgj'{
setItems(items); gI"cZ h3}
setStartIndex(0); x 0#u2j?zj
} 3_.%NgES|
~)zxIO!
public PaginationSupport(List items, int `m#i|8
gf>GK/^HH
totalCount, int startIndex){ '=eVem=
setPageSize(PAGESIZE); fJ6Q:7
setTotalCount(totalCount); $*LBZcL
setItems(items); /8<c~
setStartIndex(startIndex); S]Di1E^r;_
} `C$QR
8
-F 9xPw
public PaginationSupport(List items, int h0HK~S#xBv
7 toIbC#
totalCount, int pageSize, int startIndex){ I*$-[3/
setPageSize(pageSize); b|;h$otC
setTotalCount(totalCount); NqveL<r`
setItems(items); b`%!\I
setStartIndex(startIndex); O1wo
KkfV
} k+J63+obd
VDZOJM)(
publicList getItems(){ TAqX
f_
return items; l ?YO!$
} 8EX?/33$
#sk~L21A
publicvoid setItems(List items){ l;&kX6 w
this.items = items; =''b `T$
} 2\1bQq\
B=7maYeU
publicint getPageSize(){ * dk(<g=fM
return pageSize; wAJ=rRI
} Qpj[]c5
X[f)0w%
publicvoid setPageSize(int pageSize){ YW&`PJ9o
this.pageSize = pageSize; ^FVmP d*1
} Hs_7oy|P
q*C-DiV
publicint getTotalCount(){ l N0u1)'2
return totalCount; ledr[)
} -M_>]ubG
wA)nryXV
publicvoid setTotalCount(int totalCount){
ls7P$qq
if(totalCount > 0){ F6b;qb6n
this.totalCount = totalCount; E7_OI7C
int count = totalCount / WK@<#
s&<76kwl
pageSize; Y> ATL
if(totalCount % pageSize > 0) 5hDy62PRr
count++;
U0srwt97S
indexes = newint[count]; GCX?W`
for(int i = 0; i < count; i++){ g+c%J#F=
indexes = pageSize * B7YE+
8xG"hJR
i; TeO'E<@
} jUgx
;=
}else{ Df:/r%
this.totalCount = 0; bR~5
:A^
} 9_e_Ne`i`?
} xU}J6 Tv
s.n:;8RibP
publicint[] getIndexes(){ Q<ia
return indexes; }UQ,B
} @Y>PtA&w*
1<MJ3"60
publicvoid setIndexes(int[] indexes){ \Sv|yQUT
this.indexes = indexes; %y*'bS
} W:6#0b"_#
25 :v c0
publicint getStartIndex(){ n%iL+I
return startIndex; kC6Y?g
} 4FZ/~Y1}
H@~tJ\L
publicvoid setStartIndex(int startIndex){ gs0`nysM#
if(totalCount <= 0) p~""1m01,D
this.startIndex = 0; Sm?|,C3V
elseif(startIndex >= totalCount) 7,V_5M;t
this.startIndex = indexes jp@X,HES
w"#rwV&
[indexes.length - 1]; %}Y&qT?
elseif(startIndex < 0) G"kX#k0S
this.startIndex = 0; Q~k|lTf
else{ |W@Ko%om
this.startIndex = indexes {?EmO+![}
|$ZS26aYw}
[startIndex / pageSize]; m}zXy\
} 0uPcEpIA
} +7nvy^m
Y9vVi]4
publicint getNextIndex(){ *yo'Nqu
int nextIndex = getStartIndex() + -yg;,nCg
Q)qJ6-R|HD
pageSize; nn$^iw`
if(nextIndex >= totalCount) #o9CC)q5G
return getStartIndex(); ITi#p%
else !|]k2=+I
return nextIndex; yf`_?gJ6d
} cz>)6#&O
TBba3%
publicint getPreviousIndex(){ a2i:fz=[
int previousIndex = getStartIndex() - PYY<
!r/~D |
pageSize; G\,B*$3
if(previousIndex < 0) Br&&#
return0; 9F6dKPN:
else \Cin%S.C
return previousIndex; "wKJ8
} $ndBT+i
]Y76~!N
} LTH,a?lD
X*d!A
>s
dnXu(e%
,!g/1m
抽象业务类 ~i'!;'-_}
java代码: ="%887e
HU4h.Lm
u|u)8;'9(
/** \yxGE+~P
* Created on 2005-7-12 3webAaO
*/ ,@f |t&
package com.javaeye.common.business; 6"}F
KRR
EM+! ph
import java.io.Serializable; 0b8=94a{>
import java.util.List; yv>uzb`N
i.?rom
import org.hibernate.Criteria; wN/v-^2
import org.hibernate.HibernateException; DAORfFG74
import org.hibernate.Session; u(?U[pe[
import org.hibernate.criterion.DetachedCriteria; 0o BAJP
import org.hibernate.criterion.Projections; Zp6VH
import ]gv3|W
;pfN
org.springframework.orm.hibernate3.HibernateCallback; FYefn3b
import H$Pf$D$
-~4kh]7%
org.springframework.orm.hibernate3.support.HibernateDaoS 2e3AmR@*
-ik((qx_
upport; <@+L^Ps~z
NE)w$>0M
import com.javaeye.common.util.PaginationSupport; M\7F1\ X
f><V;D#
public abstract class AbstractManager extends Q^l!cL| {
.Zs.O/
HibernateDaoSupport { ,nP nH1vb
n-qle5s j
privateboolean cacheQueries = false; 3!QXzT$E
Xa$%`
privateString queryCacheRegion; *H=h7ESq
T%Zfo7
publicvoid setCacheQueries(boolean 6Rq +=X
e},:QL0X
cacheQueries){ xt`a":lr u
this.cacheQueries = cacheQueries; 1Ak0A6E
} =T?Xph{
rd[mC[
r
publicvoid setQueryCacheRegion(String \Ov~ t
c5O8,sT
queryCacheRegion){ kXUJlLod
this.queryCacheRegion = F*Yx1vj
s+G(N$0U
queryCacheRegion; dpt P(H
} (r}StR+
\RFA?PuY
publicvoid save(finalObject entity){ /;21?o
getHibernateTemplate().save(entity); &f?JtpB
} NxK.q)tj6
rfSEL
57'
publicvoid persist(finalObject entity){ 29|nt1Z
getHibernateTemplate().save(entity); L/vw7XNrX
} N#R8ez`
7M?Sndp$
publicvoid update(finalObject entity){ _@y9=e
getHibernateTemplate().update(entity); 9O^~l2`
} G2@'S&2@s
]<q!pE;t
publicvoid delete(finalObject entity){ ["ocZ? x
getHibernateTemplate().delete(entity); I{%(G(
} ~HtD]|7
Olt;^>MQ
publicObject load(finalClass entity, j{=}?+M
7.n\a@I/
finalSerializable id){ w&]$!g4
return getHibernateTemplate().load `7V1 F.\
>^<;;8Xh
(entity, id); #Wb4*
} ~52'iI)Mw
>:FmAey
publicObject get(finalClass entity, L"jjD:
r]~]-VZ/
finalSerializable id){ s(L!]d.S$y
return getHibernateTemplate().get As tuM]
7W&XcF
(entity, id); #X'su`+
} 3qV\XC+
Z*NTF:6c
publicList findAll(finalClass entity){ 9uX15a
return getHibernateTemplate().find("from ]A l)>
|B^Picu
" + entity.getName()); Y[>`#RhP
} 4)L};B=
PBiA/dG[;
publicList findByNamedQuery(finalString FS('*w&bP
<5ULu(b&$
namedQuery){ Lo}/k}3Sx
return getHibernateTemplate 6D{70onY+
*$1F|G
().findByNamedQuery(namedQuery); , BZ(-M
} 0+e0<'
2:yXeSeA
publicList findByNamedQuery(finalString query, X1V~.kvt)
nKTi"2dm
finalObject parameter){ a785xSUV
return getHibernateTemplate Wm)Id_
I:MrX
().findByNamedQuery(query, parameter); Un5 AStG
} AkO-PL
&{q'$oF
publicList findByNamedQuery(finalString query, }XCh>LvX
r.=.,R
finalObject[] parameters){ cnG>EG
return getHibernateTemplate Sm|TDH
$!\L6;:
().findByNamedQuery(query, parameters); n+vv
%
} -Wre4^,v
7.kH="@
publicList find(finalString query){ $8[JL\
return getHibernateTemplate().find C 8d9(u
PdRDUG{Jy
(query); rj1%IzaXU^
} |0_5iFAB|
E?Qg'|+_
publicList find(finalString query, finalObject YnCuF0>
lf R}cx
parameter){ :x?G[x=
return getHibernateTemplate().find V*@&<x"E
ZHj7^y@P
(query, parameter); @TzUcE
} zMO xJ
'68#7Hs.
public PaginationSupport findPageByCriteria ;^)4u
;L%\[H>G
(final DetachedCriteria detachedCriteria){ =xb/zu(
return findPageByCriteria IiX2O(*ZE
|]Y6*uEX<
(detachedCriteria, PaginationSupport.PAGESIZE, 0); @?0))@kPc3
} t0^)Q$
_u~`RlA
public PaginationSupport findPageByCriteria sLK$H|%>m
*WWDwY@!u
(final DetachedCriteria detachedCriteria, finalint
\vW'\}
{L M Q
startIndex){ /}5)[9GC
return findPageByCriteria %GMCyT
C
MGDg}
(detachedCriteria, PaginationSupport.PAGESIZE, +)_DaL
E
:8?l=B9("g
startIndex); /6y;fx
} f\Q_]%^W
)|Ka'\xr
public PaginationSupport findPageByCriteria kn&BGYt
N[yS heT
(final DetachedCriteria detachedCriteria, finalint Qv8 =CnuOT
W{ZJ^QAq/
pageSize, C2DAsSw
finalint startIndex){ GAh\6ul
return(PaginationSupport) H8Z|gq1r
&nY#GHB
getHibernateTemplate().execute(new HibernateCallback(){ B?
XK;*])
publicObject doInHibernate oS_YQOoD
@?t+O'&
(Session session)throws HibernateException { &.Yu%=}
Criteria criteria = #X?E#^6?E
/d$kz&aIV
detachedCriteria.getExecutableCriteria(session); v<| iN#
int totalCount = 1Z_ H%(
-"bC[ WN
((Integer) criteria.setProjection(Projections.rowCount pE.TG4
r8o^8 .
()).uniqueResult()).intValue(); <anU#bEuQ
criteria.setProjection ^r{N^
@CC
6`D
(null); Y{X%C\
List items = _) UnHp_^
un)PW&~E
criteria.setFirstResult(startIndex).setMaxResults $vnx)#r3
#"[EVF0%1D
(pageSize).list(); P|;f>*^Y
PaginationSupport ps = J d,9<m$
OA[fQH#{lX
new PaginationSupport(items, totalCount, pageSize, 5`::#[
}=u#,nDl>$
startIndex); D28>e
return ps; "R%
RI(
y{
} xhMAWFg|
}, true); mdcsL~R
} )6px5Vwz
Z[1|('
public List findAllByCriteria(final )X8N|W>vh
z|$9%uz"
DetachedCriteria detachedCriteria){ 'GLpSWL+*
return(List) getHibernateTemplate QEF$Jx
\[wbJ
().execute(new HibernateCallback(){ Ghar
hJ>v
publicObject doInHibernate d8p5a
C+E
=(v'8?--
(Session session)throws HibernateException { zV"'-iP
Criteria criteria = <."
@H<-`*
LeNSjxB
detachedCriteria.getExecutableCriteria(session); m'uFj !
return criteria.list(); "@Qg]#]JH
} C879eeJ
}, true); @r\{iSg&g.
} q/qig5Ou
G"Hj$
public int getCountByCriteria(final :_o^oi7G
Cli:;yi&n
DetachedCriteria detachedCriteria){ ##OCfCW
Integer count = (Integer) Qp>Z&LvC5
akWOE}5#
getHibernateTemplate().execute(new HibernateCallback(){ lLU8eHf\
publicObject doInHibernate }!m}?
?Q"1zcX
(Session session)throws HibernateException { ?0lz!Nq'S
Criteria criteria = P5lk3Zg'
Iq
0ew
detachedCriteria.getExecutableCriteria(session); f#gV>.P;h\
return 2_)gJ_kP
@H}Hjg_>m
criteria.setProjection(Projections.rowCount 9d!mGnl
nt%p@e!,
()).uniqueResult(); 4Ujy_E?^
} ej\Sc7.
}, true); @eq.&{&
return count.intValue(); &+yoPF
} ;ssI8\LG
} pB7^l|\]
4Ofkagg
^S!;snhn
xRqA^Ad
M6].V *k'2
.s KfwcYu4
用户在web层构造查询条件detachedCriteria,和可选的 /+m2|Ij(
pv"s!q&
startIndex,调用业务bean的相应findByCriteria方法,返回一个 #RHt;SFx
6r`Xi&
PaginationSupport的实例ps。 4I*'(6
,!
o1uM(
ps.getItems()得到已分页好的结果集 6.6?Rp".
ps.getIndexes()得到分页索引的数组 eK}GBBdO
ps.getTotalCount()得到总结果数 "w__AYHV
ps.getStartIndex()当前分页索引 K'f2S
ps.getNextIndex()下一页索引 `Io#440;
ps.getPreviousIndex()上一页索引 T>J ,kh
#G=AD/z
eL{$=Um
DD`DU^o<
Gz(l~!n~a
PM'2zP[*W
#)O^aac29
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 >=.3Vydi1
Rgl cd
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 [.&n,.k
Ei=rBi
一下代码重构了。 =J'Q%qN<Zd
Hlpt zez
我把原本我的做法也提供出来供大家讨论吧: ]0W64cuT
%.HLO.A
首先,为了实现分页查询,我封装了一个Page类: 5Sb-Bn
java代码: ]ZNFrpq
Q8$;##hzt
{uJ"%
/*Created on 2005-4-14*/ F_4Et
package org.flyware.util.page; E0+~c1P-
U\M9sTqo
/** ES8(:5
* @author Joa \r [@A3O
* 7OS i2
*/ g1(5QWb
publicclass Page { ):y^g:
V/zmbo)
/** imply if the page has previous page */ *p9k> )'J
privateboolean hasPrePage; kfZ(:3W$
@a,=ApS"
/** imply if the page has next page */ 7zIfsb
privateboolean hasNextPage; r|i)
}w8yYI
/** the number of every page */ zL'S5'<F|
privateint everyPage; N>1d]DrQR
ef/43+F^x
/** the total page number */ >Psq" Xj
privateint totalPage; a2/Mf
fzvyR2 I
/** the number of current page */ OXn-!J90P
privateint currentPage; O,S>6o)?
-)R
=p"-w
/** the begin index of the records by the current Oqq'r "S
{L [
query */ {JF"PAS7
privateint beginIndex; 'yV*eG?^&
34nfL: y
5fYWuc9}z
/** The default constructor */ }w-M.
public Page(){ ai;Q,Vy
#&1gVkvp
} q03+FLEfC
# s7e/GdKb
/** construct the page by everyPage xvomn`X1
* @param everyPage p1("
* */ IM5[O}aq
public Page(int everyPage){ g:GywXW
this.everyPage = everyPage; ZSyXzop
} |f!J-H)
&0fV;%N
/** The whole constructor */ #z7yoP
public Page(boolean hasPrePage, boolean hasNextPage, :{B']~Xf
w0vsdM;G
uZ'Z-!=CL
int everyPage, int totalPage, 5(E&jKn&
int currentPage, int beginIndex){ 5% }!z~8Y4
this.hasPrePage = hasPrePage; `(=?k[48
this.hasNextPage = hasNextPage; c]bG5
this.everyPage = everyPage; $Sa7N%D
this.totalPage = totalPage; OhlK;hvdB*
this.currentPage = currentPage; {TdxsE>
this.beginIndex = beginIndex; 1LAd5X
} "fUNrhCx
0,Ib74N'w
/** .yFO]
r1aL
* @return RDjw|V
* Returns the beginIndex. b?qV~Dgk`
*/ bf{_U%`
publicint getBeginIndex(){ [IAk9B.\
return beginIndex; USHQwn)%
} }maD8,:t
0CK
/** }pnp._j
* @param beginIndex z(
}w|
* The beginIndex to set. -;FAS3(wy
*/ =tP^vgfQ
publicvoid setBeginIndex(int beginIndex){ }xi?vAaTl
this.beginIndex = beginIndex; Ei\>gXTH1-
} l&:8 'k+%=
iA[o;D#
/** @+Sr~:K
* @return UUb0[oy
* Returns the currentPage. |5X59!
JL
*/ xXa4t4gR
publicint getCurrentPage(){ z;Fz3s7
return currentPage; _\Z'Yl
} SJc~E$5<
!H{>c@i
/** :]CL}n$*
* @param currentPage Oh>hyY)}
* The currentPage to set. @)vQ>R\k<
*/ k;2.g$)W[c
publicvoid setCurrentPage(int currentPage){ \8s:I+[HH
this.currentPage = currentPage; pV;0Hcy
} v ?}0h5
$xq04ejJ
/** OLm@-I*
* @return n;$u%2 t2
* Returns the everyPage. yWE\)]9
*/ qu dY9_
publicint getEveryPage(){ [@8 po-()L
return everyPage; kWy@wPqms
} MPy><J
1
A0BM
/** $Bl51VjN
* @param everyPage }4H}*P> +
* The everyPage to set. ccPWfy_
*/ r]DU
publicvoid setEveryPage(int everyPage){ aR('u:@jHi
this.everyPage = everyPage; zUZET'Bm9
} 5>daWmD
T!>h Pg
/** )b>misb/
* @return F4WX$;1
* Returns the hasNextPage. V45adDiZ
*/ /x$JY\cq`
publicboolean getHasNextPage(){ 6w{_+=T
return hasNextPage; ?A_+G 5
} JX[]u<h?
(xVx|:R[<H
/** <eS/-W%n6
* @param hasNextPage wVnmT94
* The hasNextPage to set. T]tu#h{
a
*/ w?^[*_Y
publicvoid setHasNextPage(boolean hasNextPage){ (w5cp!qW9J
this.hasNextPage = hasNextPage; %N&W_.F6
} ?wCX:?g
<)T~_s
/** _@[W[=|H
* @return 6
R})KIG
* Returns the hasPrePage. U` HY
eJ
*/ !6RDq`
publicboolean getHasPrePage(){ 3&AJN#c
return hasPrePage; Ba|}$jo
} `BG>%#
%O" Whe
/** ,+6u6
* @param hasPrePage g52)/HM
* The hasPrePage to set. G)t-W%D&
*/ q/ 54=8*h0
publicvoid setHasPrePage(boolean hasPrePage){ nXoDI1<[
this.hasPrePage = hasPrePage; 5;p|iT
} S7nx4c2xK~
q oi21mCn
/** |pWu|M _'
* @return Returns the totalPage. t&q~ya/C
* w4\
3*
*/ #{J~
km /
publicint getTotalPage(){ N#"l82^H*
return totalPage; I^ ![)# FC
} eL(<p]
GN!
R<9
/** ;DYS1vG o
* @param totalPage y_Urzgm(
* The totalPage to set. <f8j^
*/ z
|~+0
publicvoid setTotalPage(int totalPage){ ~M} K]Li
this.totalPage = totalPage; <,n:w[+!`P
} 4m91XD
nQ+5jGP1
} O_4B>
)zd
jaKW[@<
x< 2]UB`
R<6y7?]bZ
Qg(;>ops
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 }8aqSD<:
SE^l`.U@
个PageUtil,负责对Page对象进行构造: :?g+\:`/0j
java代码: d4\JM 65
};9s8VZE
,h'Q
/*Created on 2005-4-14*/ 9wldd*r
package org.flyware.util.page; &,jUaC5I
p!^K.P1 '
import org.apache.commons.logging.Log; 8zj&e8&v
import org.apache.commons.logging.LogFactory; 5 D^#6h 4
j8[U}~*^
/** 2-8Dc4H]r
* @author Joa qAH^BrJ
* $6wSqH?q
*/ M57<e`m
publicclass PageUtil { ~Hub\kn
Sqb>aj
privatestaticfinal Log logger = LogFactory.getLog E wFq1~
`P !idg*
(PageUtil.class); pInEB6L.P
3I~.'>Pd
/** O$m &!J
* Use the origin page to create a new page GAYn*'<
* @param page Kd+E]$F_OH
* @param totalRecords : q%1Vi
* @return tNzO1BK
*/ HB5-B XBU
publicstatic Page createPage(Page page, int * BR#^Wt
%~Rg`+
totalRecords){ Zf!Q4a"
return createPage(page.getEveryPage(), ,;w~ VZ4
Y]0c%Fd
page.getCurrentPage(), totalRecords); g*YA~J@
} "D_:`@V(
59l9_yFJ
/** v:/!OvLe
* the basic page utils not including exception X coPkW
2!B|w8ar
handler _1G/qHf^S
* @param everyPage &k}B66
* @param currentPage >(igVaZ>
* @param totalRecords
S 4
17.n
* @return page U~7udUR
*/ V^[&4
publicstatic Page createPage(int everyPage, int (W:@v&p
$RY GAh
currentPage, int totalRecords){ }l$zZ>.\H
everyPage = getEveryPage(everyPage); r.#r!.6 q
currentPage = getCurrentPage(currentPage); r1%{\<
int beginIndex = getBeginIndex(everyPage, %?gG-R
U- 1UWq
currentPage); !fn%Q'S
int totalPage = getTotalPage(everyPage, H<i!C|AF
E:**gvfq
totalRecords); l5H5!$3~
boolean hasNextPage = hasNextPage(currentPage, +)q ,4+K%}
@#,/6s7?
totalPage); FD
8Lk
boolean hasPrePage = hasPrePage(currentPage); 1[Yl8W%pj
?|W3RK;
returnnew Page(hasPrePage, hasNextPage, Bt@?l]Y
everyPage, totalPage, zc)nDyn
currentPage, _p0Yhju?
Evm3Sm!S
beginIndex); [=jZP,b&),
} k $gcQ:|
Sj(>G;
privatestaticint getEveryPage(int everyPage){ vJ'22)n
return everyPage == 0 ? 10 : everyPage; -kLBq:M
} h092S |iY
<H60rON
privatestaticint getCurrentPage(int currentPage){ +CBN[/Z^i
return currentPage == 0 ? 1 : currentPage; d>)=|
} ZXYyG`3+
|f$+|9Q?
privatestaticint getBeginIndex(int everyPage, int a}NB6E)-
!vu-`u~86
currentPage){ Kj
@<$ChZw
return(currentPage - 1) * everyPage; Oz-/0;1n
} g*oX`K.
ig.Z,R3@r
privatestaticint getTotalPage(int everyPage, int v;
#y^O
&57~i=A
3
totalRecords){ uVU)LOx
int totalPage = 0; 7MrHu2rZ=
ma*#*4
if(totalRecords % everyPage == 0) }9\6!GY0
totalPage = totalRecords / everyPage; 61kSCu
else BI)C\D3[
totalPage = totalRecords / everyPage + 1 ; C;JW\J~W
vPYHM2
return totalPage; %4!^AA%
} #*CMf.OCh
1PdG1'
privatestaticboolean hasPrePage(int currentPage){
+\_\53
return currentPage == 1 ? false : true; BE@(| U
} "QXnE^
kK4a;j.#
privatestaticboolean hasNextPage(int currentPage, >Df;1:U
Iga+8k
int totalPage){ Y2l;NSWU
return currentPage == totalPage || totalPage == 8o|C43Q_
;AOLbmb)H4
0 ? false : true; +5|k#'%5
} PV~D;
cb)7$S
,iao56`E
} |-S!)iG1V
*> nOL
bskoi;)u
5<PNl~0
Sq,>^|v4&e
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 #b428-
y$-@|M$GG
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 ?C fQwY#N
\)uA:v
做法如下: 2=K|kp5
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 sHBTB6)lx
ghB&wOm/
的信息,和一个结果集List: -n|>U:
java代码: c$ib-
V^Z5i]zT
rM= :{
/*Created on 2005-6-13*/ Lwi"K8.u
package com.adt.bo; e'$[PF
qQ)1+^
import java.util.List; -|}?+W
9rz$c, Y(
import org.flyware.util.page.Page; 'q:7PkN!p
IowXVdm@6
/** +=9iq3<yfS
* @author Joa <\$"U5"`
*/ 1K/ :
publicclass Result { 1HNP@9ga
F!hjtIkPj
private Page page; #3_g8ni5X
9VTAs:0D=
private List content; )ddJ\:
R$l-
7YSt
/** bFN/{^SB
* The default constructor n7;jME/!
*/ V0>[bzI
public Result(){ D['J4B
super(); L$O\fhO?
} ^ICSh8C
h&L-G j
/** )_C>hWvo_
* The constructor using fields /hqn>t
* Z_bVCe{
* @param page <h9nt4F
* @param content baG_7>Q9H
*/
K!9K^ h
public Result(Page page, List content){ U'F}k0h?\'
this.page = page; dO2?&f
this.content = content; <S7SH-{_\
} j$_?g!I=gK
^cPVnl
/** lbt8S.fx
* @return Returns the content. D1-w>Y#
*/ pm=O.)g4`
publicList getContent(){ Ag\RLJ.KD
return content; 5>%^"f
} U`3?bhzua
6|q"lS*$S
/** 6p)&}m9!
* @return Returns the page. J/Y9 X,
*/ 55.2UN
public Page getPage(){ &uE )Vr4 R
return page; N`IXSE
} ~),%w*L
d m"R0>
/** *LBF+L^C%
* @param content B=]L%~xL$
* The content to set. U}X'RCM
*/ #y#TEw,
public void setContent(List content){ XQ[\K6X5
this.content = content; lU
Zj
} VFZyWX@#u
ec#`9w$
/** v `/nX->
* @param page cu?6\@cD
* The page to set. Xp<O
*/ %KO8i)n
publicvoid setPage(Page page){ ~ u1~%
this.page = page; B0yGr\KJ
} . mO8~Z
} }OcrA/
?+=,t]`!m
p@Os
@Yb8CB
l[5** ?#
2. 编写业务逻辑接口,并实现它(UserManager, <astIu Au
Z)xcxSo
UserManagerImpl) :
^}!"4{
java代码: Y{e,I-"{
& ;5f/
: I";&7C
/*Created on 2005-7-15*/ bt1bTo
package com.adt.service; ,V]FAIJ
r*mYtS
import net.sf.hibernate.HibernateException; 2Q(ZW@0
:n~Mg{j3
import org.flyware.util.page.Page; l<=k#d
N4VZl[7?
import com.adt.bo.Result; X(d:!-_m *
/o$6"~t
/** "dndhoMq
* @author Joa !X"nN9k
*/ aDz%
%%:r
publicinterface UserManager { +ah4 K(+3
-ys/I,}<
public Result listUser(Page page)throws #gWok'ZcR
rLD1Cpeb,w
HibernateException; @~$=96^
KMb'm+
} $Nvox<d0
)2W7>PY
-u~:Gd*l0
8%4v6No&*
:+9. v
java代码: k
"7,-0gz
EqD@o
"S{GjOlEDF
/*Created on 2005-7-15*/ 8TH;6-RT
package com.adt.service.impl; dQH8s
{s*1QBM$\Z
import java.util.List; ~a7@O^q4
\hlS?uD\
import net.sf.hibernate.HibernateException; TGG=9a]m
K\ pZ
import org.flyware.util.page.Page; A9Ea}v9:
import org.flyware.util.page.PageUtil; |iSwG=&
2XBHo (
import com.adt.bo.Result; + rN#
import com.adt.dao.UserDAO; \C;Yn6PK0
import com.adt.exception.ObjectNotFoundException; L*Ffic
import com.adt.service.UserManager; >W/mRv&
z/5TYv)S
/** *pS3xit~
* @author Joa %y>*9$<pXe
*/ ${. :(z
publicclass UserManagerImpl implements UserManager { #>CWee;
rjfWty%6pX
private UserDAO userDAO; .{;RJ:O
>PdrLwKS
/** pkG8g5(w
* @param userDAO The userDAO to set. BB1_EdoG
*/ 2^5RQl/
publicvoid setUserDAO(UserDAO userDAO){ s&WE'
this.userDAO = userDAO; Qd3ppJn
} NV}fcZ
GmUm?A@B
/* (non-Javadoc) {KTZSs $n
* @see com.adt.service.UserManager#listUser hQzT
=0
o4rf[.z
(org.flyware.util.page.Page) bTYR=^9
*/ CIwI1VR^
public Result listUser(Page page)throws
_,Q -)\
i[33u p
HibernateException, ObjectNotFoundException {
S[8nGH#m
int totalRecords = userDAO.getUserCount(); { }Afah
if(totalRecords == 0) ed/
"OgA
throw new ObjectNotFoundException )WEOqaR]
T9}dgf
("userNotExist"); vXdI)Sx[
page = PageUtil.createPage(page, totalRecords); ow,! 7|m
List users = userDAO.getUserByPage(page);
NQ '|M
returnnew Result(page, users); }DvT6
} :W-xsw
$RRh}w\0^
} - sq=|
(S=CxK
ffOV7Dxy
'UCClj;?K
gz:US77
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 {c
$8?6
*m&'6qsS
询,接下来编写UserDAO的代码: qvh8~[
3. UserDAO 和 UserDAOImpl: #x6wM~
java代码: |D;I>O^"R
: 9>U+)%
=.`e4}u \X
/*Created on 2005-7-15*/ W$D:mw7
package com.adt.dao; ZS&+<kGD
L[+4/a!HQ
import java.util.List; (G>g0(;D-
j->5%y
import org.flyware.util.page.Page; (r.y
-ebyW#
import net.sf.hibernate.HibernateException; /5>A 2y
e/)Vx'd`+
/** 8X\":l:
* @author Joa 0w2<2grQ
*/ H7 {kl
publicinterface UserDAO extends BaseDAO { }mk z_P(Z
(
~>-6Nb 5
publicList getUserByName(String name)throws /dR:\ffz2
tg2+Z\0)4g
HibernateException; -?)z@Lc
ZoqE,ucH
publicint getUserCount()throws HibernateException; 2tp95E`(O
*2m{i:3
publicList getUserByPage(Page page)throws #("E)P
5G#2#Al(F
HibernateException; ~f8:sDJ
8hX/~-H
} SmP&wNHQf
@Rqn&tA8
k#5Qwxu`
&x[V<Gq
:{#w-oC>6P
java代码: 9$R}GK
)*BG-nM u
jpiBHi]5+
/*Created on 2005-7-15*/ EBUCG"e
package com.adt.dao.impl; Q\le3KB
NrcxuItkYn
import java.util.List; t8#u}u
+=L^h9F
import org.flyware.util.page.Page; baR*4{]
W_]onq6
import net.sf.hibernate.HibernateException; 2J6(TrQ
import net.sf.hibernate.Query; l4E0/F
[_tBv" z
import com.adt.dao.UserDAO; ?$H=n{iW
b;G#MjQp'
/** =|3*Y0
* @author Joa >Cglhsb:N
*/ sH{(=N
public class UserDAOImpl extends BaseDAOHibernateImpl Dgz^s^fxU
t \,XG
implements UserDAO { I^gLiLUN*6
'!XVz$C
/* (non-Javadoc) U!524"@%U`
* @see com.adt.dao.UserDAO#getUserByName Cfst)[j
U{&gV~
(java.lang.String) J+Zp<Wu-
*/ 4Mv] z^
publicList getUserByName(String name)throws ZcrFzi
[Pz['q L3t
HibernateException { +nQp_a1{9%
String querySentence = "FROM user in class .arWbTR)~U
39Tlt~Psz
com.adt.po.User WHERE user.name=:name"; ,\ zx4*
Query query = getSession().createQuery &]1gx#
2j-^F
(querySentence); "VQ7Y`,+
query.setParameter("name", name); -h,?_d>
return query.list(); sk~inIj-
} [|APMMYK1
LCemM; o
/* (non-Javadoc) %bgUU|CdA
* @see com.adt.dao.UserDAO#getUserCount() HV8=b"D"
*/ :$&