Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 &a V`u?'e
s\@!J.Da
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 hUqIjc uL4
5( 3tPbm{
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 GE|V^_|i
vV%w#ULxE~
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 L~\Ir
j
sm{|'
。 =oBV.BST u
E;yP.<PW
分页支持类: &Mol8=V)
q:fkF^>
java代码: 8q_nOGd
yovC~
2TdcZ<k}J
package com.javaeye.common.util; C&\#{m_1B
d;K,2
import java.util.List; \]zHM.E1
u-D%: lz85
publicclass PaginationSupport { Ay[6rUO
GujmBb
publicfinalstaticint PAGESIZE = 30; 'Je;3"@
BPW2WSm@<
privateint pageSize = PAGESIZE; uT_bA0jK
lwSA!W
privateList items; k/>k&^?
d-X<+&VZ
privateint totalCount; v81<K*w`P
$%ps:ui~X
privateint[] indexes = newint[0]; f mf(5
n* uT
privateint startIndex = 0; 3>ytpXUEGx
@PutUYz
public PaginationSupport(List items, int <d8Yk>R
i6aM}p<
totalCount){ F.4xi+S_
setPageSize(PAGESIZE); !Eu}ro.}
setTotalCount(totalCount); 04o(05K
setItems(items); *4]}_ .rG#
setStartIndex(0); k*J0K=U|
} d-y8c
jx J5F3d
public PaginationSupport(List items, int nwf(`=TC
"d%o%
totalCount, int startIndex){ w~Aw?75t
setPageSize(PAGESIZE); )
}(Po_
setTotalCount(totalCount); 51xiX90D
setItems(items); 13kl\<6
setStartIndex(startIndex); b-,4< H8m
} :wtK'ld
EJrP{GH
public PaginationSupport(List items, int iU+O(vi
xQ%N%
`
totalCount, int pageSize, int startIndex){ F P3{Rp
setPageSize(pageSize); *|Tx4Qt
setTotalCount(totalCount); Vmt$]/
setItems(items); P`^nNX]x+,
setStartIndex(startIndex); kZ$2Uss
} @cukoLAn
>4
VN1^
publicList getItems(){ 8u6*;*o
return items; yhc}*BMZ
} &sJ -&7YZ
\8g'v@$wG
publicvoid setItems(List items){ vhvFBx0
this.items = items; }Y:V&4DW
} %g: 6QS|
shKTj5s?
publicint getPageSize(){ $Y,y~4I
return pageSize; BlnR{Y
} 1
8%+ Hy=
]lqLC
publicvoid setPageSize(int pageSize){ 9(6f:D
this.pageSize = pageSize; 3N257]
} VYbH:4K@%
^,}1^?*
publicint getTotalCount(){ 3$G &~A{
return totalCount; g8kS}7/
} zncKd{Q\tP
wDR/Vr"f
publicvoid setTotalCount(int totalCount){ 5If.[j{
if(totalCount > 0){ ,+~8R"
this.totalCount = totalCount; q#=HBSyM
int count = totalCount / 5/8=Do](
MQ#k`b#()
pageSize; 2)hfYLi
if(totalCount % pageSize > 0) Y O&@
count++; `3g5n:"g\
indexes = newint[count]; }k;wSp[3
for(int i = 0; i < count; i++){ FRa>cf4
indexes = pageSize * B`|f"+.
|P@N}P@
i; f*}}Az.4
} "%lIB{
}else{ nr&bpA/
this.totalCount = 0; ijP`fM8
} Fs"i fn0
} ?zex]!R
9fm9xTL
publicint[] getIndexes(){ >v2/0>U
return indexes; bFjH*~
P
}
pu~b\&^G
,oykOda:|
publicvoid setIndexes(int[] indexes){ >dx/k)~~-L
this.indexes = indexes; `*6|2
} e>6|# d
DL`8qJ'mJs
publicint getStartIndex(){ IdqCk0lVD
return startIndex; X$e*s\4
} !0dQfj^_
i-PK59VZ8f
publicvoid setStartIndex(int startIndex){ =^1jVaAL
if(totalCount <= 0) EQN)y27poW
this.startIndex = 0; tk]D)+{u&c
elseif(startIndex >= totalCount) _K}q%In
this.startIndex = indexes nrHC;R.nE
`WIZY33V
[indexes.length - 1]; , #=TputM
elseif(startIndex < 0) 9#TD1B/
this.startIndex = 0; M287Z[
else{ DQ(0:r
this.startIndex = indexes 7Xx3s@
`;Ho<26
[startIndex / pageSize]; yts@cd`$
} C$q};7b1N
} elAWQE us
XLC9B3Jt
publicint getNextIndex(){ F ei5'
int nextIndex = getStartIndex() + )X?oBNsj
FRuPv6
pageSize; f"RC(("6W
if(nextIndex >= totalCount) yX4Vv{g
return getStartIndex(); /5)*epF+
else QEg[
return nextIndex; ~Oa$rqu%m
} 3CgID6[Sy
GF6 o
publicint getPreviousIndex(){ ,A'| Z
int previousIndex = getStartIndex() - b"uO BB
n&Ckfo_D
pageSize; 10fxK
if(previousIndex < 0) d7Vp^^}(
return0; R\|,GZ!`+
else 1~t.2eU G
return previousIndex; ;89kL]
} rCwE$5
b
[3"F$?e5
} i,h 30J
FY^2 Y
k:I,$"y4
OHi.5 (
抽象业务类 +}O -WX?
java代码: Xf_#O'z
KF
zI27r
vP x/&x
/** ~v%6*9
* Created on 2005-7-12 `Jk0jj6Z
*/ 0u1ZU4+EC
package com.javaeye.common.business; QuqznYSY{
A+="0{P
import java.io.Serializable; ''YqxJ fb
import java.util.List; I<O$);DV'
N]w_9p~=1
import org.hibernate.Criteria; O`c+y
import org.hibernate.HibernateException; &nP0T-T5y
import org.hibernate.Session; gE _+r
import org.hibernate.criterion.DetachedCriteria; Vx(*OQ
import org.hibernate.criterion.Projections; Vf;&z$D{r
import ka~_iUU4
0K[]UU=P=
org.springframework.orm.hibernate3.HibernateCallback; GuO}CQs^W
import :a6LfPEAX
K_;vqi^1^&
org.springframework.orm.hibernate3.support.HibernateDaoS tsAV46S
H0;Iv#S!
upport; !{g<RS(c
rz@qW2
import com.javaeye.common.util.PaginationSupport; &J)<1!|
3Rc*vVnI
public abstract class AbstractManager extends )[ A-d(y=
d
#1Y^3n
HibernateDaoSupport { H"FK(N\
sqrLys_S
privateboolean cacheQueries = false; l::q
F 0
R3~,&ab
privateString queryCacheRegion; B:Ts_9*
EY )2,
publicvoid setCacheQueries(boolean ZU73UL
g%&E~V/g$
cacheQueries){ sq!$+=1-X
this.cacheQueries = cacheQueries; mY.v:
} rS{}[$Zpl
iX$G($[l(
publicvoid setQueryCacheRegion(String G
IN|cv=
!BsQJ_H
queryCacheRegion){ ~Jk&!IE2
this.queryCacheRegion = P9/ (f$ =
^ +SE_ -+]
queryCacheRegion; 7q+D}+ Xf
} fZ$b8
T&lgWOls
publicvoid save(finalObject entity){ BM<q;;pO
getHibernateTemplate().save(entity); 9B!Sv/)y!r
} mux/\TII
;cXw;$&D
publicvoid persist(finalObject entity){ Bn7uKa{P
getHibernateTemplate().save(entity); 6nZ]y&$G-k
} Ipk;Nq
0G+Q^]0
publicvoid update(finalObject entity){ nF@**,C Q
getHibernateTemplate().update(entity); @|\9<S
} {V6&((E8
#7i*Diqf9
publicvoid delete(finalObject entity){ J,F1Xmr4
getHibernateTemplate().delete(entity); p?i.<Z
} fOV_ >]u
4.!1odKp
publicObject load(finalClass entity, } ?j5V
B?! L~J@p
finalSerializable id){ 6Ijt2c'A}
return getHibernateTemplate().load W:_-I4q~
ISGw}# }]?
(entity, id); J!2Z9<q5
} ^ Oh
k7^hcth
publicObject get(finalClass entity, \rS*\g:i
4j#y?^s
finalSerializable id){ N1$u@P{
return getHibernateTemplate().get ,^:{!?v
JT?u[pQ^
(entity, id); d=D-s
} gQ_<;'m)2
)2&3D"V
publicList findAll(finalClass entity){ tm+*ik=x|
return getHibernateTemplate().find("from hzo> :U
G?s9c0f
" + entity.getName()); o;$xN3f,
} $G".PWc
Q;]JVT1
publicList findByNamedQuery(finalString Vu3DP+u|i
UzxL" `^7
namedQuery){ Xs~'M/>
O
return getHibernateTemplate [Fl_R[o
JOJ.79CT
().findByNamedQuery(namedQuery); vGkemJ^/
} w:5?ofC
aJ'Fn
publicList findByNamedQuery(finalString query, 32wtN8kx
S(gr>eC5
finalObject parameter){ cnu&!>8V
return getHibernateTemplate -c_l
n K
x3q^}sj%
().findByNamedQuery(query, parameter); .KrLvic
} ?2]fE[SqY
@7Ec(]yp
publicList findByNamedQuery(finalString query, 39v Bsc
QP(0
finalObject[] parameters){ > Vm}u`x
return getHibernateTemplate "wgPPop
`?z('FV
().findByNamedQuery(query, parameters); N3%#JdzZ$
} ZC?~RXL(
wW%b~JX
publicList find(finalString query){ $|~<6A{y
return getHibernateTemplate().find i!a!qE.1
`NIb?/!f
(query); QTHY{:Rmu
} )]fsl_Yq
3Bl|~K;-
publicList find(finalString query, finalObject UD-+BUV
|{#St-!-7
parameter){ Ok!P~2J
return getHibernateTemplate().find ]64Pk9z=
tx09B)0
(query, parameter); bBi>BP=
} %p 6Ms
s ~Eo]e
public PaginationSupport findPageByCriteria %3`*)cp@
t/[2{'R4
(final DetachedCriteria detachedCriteria){ dcf,a<K\
return findPageByCriteria jr`swyg
!]F`qS>
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 7nB4(A2[S4
} b7sfr!t_d
"9;
public PaginationSupport findPageByCriteria HxO+JI`'3
x{pj`'J)
(final DetachedCriteria detachedCriteria, finalint Ichg,d-M-K
Zz0er|9]Q
startIndex){ nE]rPRU}[
return findPageByCriteria YuhfPa
;>PHkJQ
(detachedCriteria, PaginationSupport.PAGESIZE, sPNm.W$_
1UMEbb
startIndex); /4;mjE
} y6$a:6
$n<1D -0!r
public PaginationSupport findPageByCriteria -b!?9T?}
RvR.t"8
(final DetachedCriteria detachedCriteria, finalint #N][-i
f#l9rV"@g
pageSize, ^&;,n.X5Z
finalint startIndex){ [A~?V.G
return(PaginationSupport) #._JB-,'
_WS8I>
getHibernateTemplate().execute(new HibernateCallback(){ -53c0g@X
publicObject doInHibernate =X'[r
n.l#(`($4
(Session session)throws HibernateException { Uh.swBC n
Criteria criteria =
:q/s%`ob
o(tJc}Mh+(
detachedCriteria.getExecutableCriteria(session); @fA{;@N
int totalCount = fq>{5ODO
|eRE'Wd0
((Integer) criteria.setProjection(Projections.rowCount zfop-qDOc
,u}wW*?,sT
()).uniqueResult()).intValue(); +
E{[j
criteria.setProjection B2NIV7
^li3*#eT
(null); G&h@
List items = ?b7ttlX{
>a975R*g
criteria.setFirstResult(startIndex).setMaxResults 7)U
ik}0
nReIi;pi
(pageSize).list(); ! VT$U6
PaginationSupport ps = E]Mx<7;\.
ICz:>4M-dn
new PaginationSupport(items, totalCount, pageSize, fgqCX:SWz
l$5nv5r
startIndex); 1L`V{\_0s
return ps; @v`.^L{P
} ViW2q"4=
}, true); ]U#of O
} )"?'~ 5A
@KM?agtlbl
public List findAllByCriteria(final f
I%8@ :
&B5&:ib1D
DetachedCriteria detachedCriteria){ `a52{Wa
return(List) getHibernateTemplate /,SVG1
qUfoEpW2=6
().execute(new HibernateCallback(){ j3&q?1
publicObject doInHibernate "$N$:B @U
jOCV)V9}
(Session session)throws HibernateException { F=Xb_Gd`
Criteria criteria = 3rK\
f4'
8GBKFNR8
detachedCriteria.getExecutableCriteria(session); j=pg5T
return criteria.list(); v2tVq_\AMx
} 8d$|JN;)
}, true); t<dFH}U`w
} XZN@hXc9:v
T
9`AL
public int getCountByCriteria(final i+(>w'=m
kMW9UUw
DetachedCriteria detachedCriteria){ )*_G/<N)|
Integer count = (Integer) [4xZy5V
"'t f]s
getHibernateTemplate().execute(new HibernateCallback(){ ,|z@Dy
publicObject doInHibernate 8Vz!zYl
@_t=0Rc
(Session session)throws HibernateException { n;Mk\*Cg
Criteria criteria = 4"|3pMr
X>
98`
detachedCriteria.getExecutableCriteria(session); oAifM1*0
return A3.I|/
aoz+T h3
criteria.setProjection(Projections.rowCount Cgln@Rz
G(?1 Urxi
()).uniqueResult(); `StuUa
} l1kHFeq
}, true); <r <{4\%}
return count.intValue(); p5qfv>E8)
} &_]G0~e
} NL:dyV}
&*o4~6pQ#
,FP0n
i+5Qs-dHA
6Br^Ugy
N?t*4Y
用户在web层构造查询条件detachedCriteria,和可选的 pq]z%\$u
W\-`}{B_/
startIndex,调用业务bean的相应findByCriteria方法,返回一个 2ZV; GS#
2!LDrvPP
PaginationSupport的实例ps。 3{.]!
f"gYXaVF+
ps.getItems()得到已分页好的结果集 #qk=R7"Q
ps.getIndexes()得到分页索引的数组 /":/DwI'
ps.getTotalCount()得到总结果数 \^0>h`[
ps.getStartIndex()当前分页索引 (xvg.Nby
ps.getNextIndex()下一页索引 Q_p&~ PNy5
ps.getPreviousIndex()上一页索引 74N_> 1!j
W%5))R$
s)E8}-v
_Q Hk&-Lp
[>>_%T\I
oQpGa>6U&
)?OdD7gd
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Kg~D~
+j
I@z@s}x>
,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 lH?jqp
q {}5wM
一下代码重构了。 [(g2u@
2.</n}g
我把原本我的做法也提供出来供大家讨论吧: zOA~<fhT
J~J+CGT~2
首先,为了实现分页查询,我封装了一个Page类: P<Z` 8a[
java代码: &ZMQ]'&
|wJdp,q R
$bp$[fX(e
/*Created on 2005-4-14*/ G6{'|CV
package org.flyware.util.page; } D!tB
\15'~]d
/** Zgp9Uu}"
* @author Joa PA803R74
* 9i 9
,X^=
*/ x6JV@wA&
publicclass Page { qLX<[UL
)c*xKij
/** imply if the page has previous page */ rSt5@f?
privateboolean hasPrePage; 'hWA&Xx+
` ;mQ"lO
/** imply if the page has next page */ #hn
privateboolean hasNextPage; R+ \%
d0}(d Gl
/** the number of every page */ 'bLP#TAzf
privateint everyPage; j&/+/s9N
lijTL-3
/** the total page number */ _:NQF7X#ug
privateint totalPage; OO?N)IB@
:4)x
/** the number of current page */ &`s{-<t<L
privateint currentPage; OA6i/3 #8
t}I@Rmso
/** the begin index of the records by the current >WZbbd-
w^zqYGxG)
query */ zJ(DO>,p&
privateint beginIndex; fQ1j@{Xa
R=a4zVQ
6^J[SQ6P
/** The default constructor */ ;{H Dz$
public Page(){ -3?
<Ja
(x/:j*`K
} zd8A8]&-
a;KdkykG
/** construct the page by everyPage JW><&hY$"
* @param everyPage oL R/\Y(
* */ U!Zj%H1XQ0
public Page(int everyPage){ lr;ubBbT
this.everyPage = everyPage; iex%$> "
} 7neJV
ct|0zl~
/** The whole constructor */ Q1|6;4L
public Page(boolean hasPrePage, boolean hasNextPage,
*p9)5
!hfpa_5
gQSVPbzK
int everyPage, int totalPage, aB (pdW4
int currentPage, int beginIndex){ f4AN"rW
this.hasPrePage = hasPrePage; w (`g)`
this.hasNextPage = hasNextPage; *2~WP'~PQd
this.everyPage = everyPage; mE{QT ZS
this.totalPage = totalPage; H[s+.&^
this.currentPage = currentPage; GTfM *b
this.beginIndex = beginIndex; aj|PyX3P:
} @$5~`?
E(6P%(yt8
/** *)B \M>
* @return *re?V9
* Returns the beginIndex. NL
`
*/ MUZ]*n&0
publicint getBeginIndex(){ >Ho=L)u
return beginIndex; RuVk>(?WK%
} "8ZV%%elp
[~|k;\2 +
/** >oyf i:
* @param beginIndex bcT_YFLQ
* The beginIndex to set. YWd2bRb
*/ 4<}@hk
Y
publicvoid setBeginIndex(int beginIndex){ ]smu~t0\
this.beginIndex = beginIndex; ;xw9#.d#D
} _~CJitR3
z8S]FpM6
/** Z/: yYSq
* @return Z-ci[Zv
* Returns the currentPage. ;c]O *\/
*/ k0PwAt)65
publicint getCurrentPage(){ " v
wLj:
return currentPage; $ eL-fg
} 1TA!9cz0Z
G8w @C
/** mYJ8O$
* @param currentPage uMGy-c
* The currentPage to set. aw lq/
*/ 52#
*{q}
publicvoid setCurrentPage(int currentPage){ +,R!el!o~u
this.currentPage = currentPage; C^'r>0
} 2P'Vp7f6 Y
ZHeue_~x4
/** Uv.Xw} q
* @return s/J7z$NEU
* Returns the everyPage. S?i^ ~
*/ O\o@]
publicint getEveryPage(){ Cb<7?),vK
return everyPage; or;VmU8$zb
} cf>lY
*Uy>F[%@
/** ,3}+t6O"
* @param everyPage a9^})By&
* The everyPage to set. ,Iz9!i
J"
*/ tGl|/
publicvoid setEveryPage(int everyPage){ v_%6Ly
this.everyPage = everyPage; ("}Hs[
} 8'3&z-
u&o4?]6
/** G.XxlI}
* @return a(O@E%|u
* Returns the hasNextPage. s8]%L4lvu
*/ H@zv-{}T8
publicboolean getHasNextPage(){ (ESFR0
return hasNextPage; mP15PZ
} $(0<T<\
n;xzjq-
/** rttKj{7E
* @param hasNextPage [-Y~g%M
* The hasNextPage to set. ,mCf{V]#
*/ 2w1Mf<IXPo
publicvoid setHasNextPage(boolean hasNextPage){ 5Y`4%*$
this.hasNextPage = hasNextPage; N`N=}&v ]
} T$r/XAs
BDPE.8s
/** o8E<_rei
* @return hB\BFVUSn/
* Returns the hasPrePage. d72
yu3
*/ O3slYd&V
publicboolean getHasPrePage(){ hr'?#K
return hasPrePage; Q2)5A&U\
} XZ$g~r
6OC4?#96%'
/** sP@XV/`3L6
* @param hasPrePage 8aRmHy"9l
* The hasPrePage to set. Bw`? zd\*
*/ ^_G#JJ\@$
publicvoid setHasPrePage(boolean hasPrePage){ &"tQpw5
this.hasPrePage = hasPrePage; ny^uNIRPR
} q |Pebe=
=w _T{V
/** Mx93D
* @return Returns the totalPage. dXY}B=C
* P*?2+.
*/ r
SoT]6/
publicint getTotalPage(){ x?0(K=h,
return totalPage; p.4Sgeh#
} ^HP$r*
MGwXZ7?E
/** -Tuk.>i)
* @param totalPage Qqb%^}Xx'u
* The totalPage to set. g .:ZMV
*/ H)*%e G~
publicvoid setTotalPage(int totalPage){ K|~!oQ
this.totalPage = totalPage; q(s0dkrj
} {t0!N]'
C$at9=(E6
} '5T:*Yh
'X&"(M
yl' IL#n]r
Op9+5]XF
pG*W>F
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 z:dW 'U?1
J$jLGy& '
个PageUtil,负责对Page对象进行构造: X&49C:jN
java代码: @{<^rLt
5 8U[IGs(
PDgZb
/*Created on 2005-4-14*/ O6-';H:I]L
package org.flyware.util.page; 9ucoQ@
$V<fJpA
import org.apache.commons.logging.Log; $'*{&/@
import org.apache.commons.logging.LogFactory; _Eq,udCso
5|bfrc
/** ~U8#yo
* @author Joa i}<fg*6@E
* 4.kn,s
*/ B~<bc
publicclass PageUtil { iY sQ:3s
a{ByU%
privatestaticfinal Log logger = LogFactory.getLog +]H!q
W:
0H'G./8
(PageUtil.class); !14v Ovj4{
cZ.p
/** @v/Ae_q!
* Use the origin page to create a new page m5?t<H~
* @param page 3ox|Mz<aZX
* @param totalRecords h:z$uG
* @return daQJ{Cd,w
*/ dt<P6pK-
publicstatic Page createPage(Page page, int &)!N5Veb
KmD#Ia
totalRecords){ E%Ysyk
return createPage(page.getEveryPage(), %|2x7@&s
e<u~v0rDl
page.getCurrentPage(), totalRecords); Fb{HiU9<!
} 1[RI
07g7*
VF<VyWFC0`
/** R\6dvd
* the basic page utils not including exception #N97
_w5c-\-PUM
handler !.|A}8nK
* @param everyPage \/m-G:|
* @param currentPage xWWVU}fd1
* @param totalRecords <@n3vO6
* @return page `,c~M
*/ ub4(g~E
publicstatic Page createPage(int everyPage, int e:QH3|'y
j2hp*C'^
currentPage, int totalRecords){ gb^'u
everyPage = getEveryPage(everyPage); Q'^$;X~-<
currentPage = getCurrentPage(currentPage); $D*Yhv!/
int beginIndex = getBeginIndex(everyPage, [XA:pj;rg'
vcOw`oS
currentPage); /5f=a
int totalPage = getTotalPage(everyPage, cdL0<J b,
|Yi_|']#
totalRecords); &c=
3BEh
boolean hasNextPage = hasNextPage(currentPage, 4%jQHOZ
cm>+f ^4?n
totalPage); ~^g*cA
t}
boolean hasPrePage = hasPrePage(currentPage); %W2
o`W$
JWxSN9.X
returnnew Page(hasPrePage, hasNextPage, ae+*gkPv8
everyPage, totalPage, J@q!N;eh|
currentPage, 5*y6{7FLp
A{Y/eG8
beginIndex); zK: 2.4
} xUB{{8B:L
\%#luk@:
privatestaticint getEveryPage(int everyPage){ Oh7wyQiV
return everyPage == 0 ? 10 : everyPage; Gfle"_4m8
} !@)tkhP
drB$q[Ak9
privatestaticint getCurrentPage(int currentPage){ (%]M a
return currentPage == 0 ? 1 : currentPage; Q6PMRG}/o
} 3+vMi[YO
h& Ezhv2
privatestaticint getBeginIndex(int everyPage, int <ZoMKUuB
PW*[(VX
currentPage){ qD}O_<_1ym
return(currentPage - 1) * everyPage; P[P]oT.N
} /8>we`4
~:UAL}b{\~
privatestaticint getTotalPage(int everyPage, int Rap_1o9#\
<'P+2(Oi
totalRecords){ Ke\FzZ]
int totalPage = 0; U]iZ3^8VT
W=!D[G R
if(totalRecords % everyPage == 0) 6[]O3Aa
totalPage = totalRecords / everyPage; >6z7.d
else ]Mgxv>zRbs
totalPage = totalRecords / everyPage + 1 ; `n%8y I%
v-}D>)M^W
return totalPage; R lmeZy4.
} f_r4*#&v
7p Zd?-6M^
privatestaticboolean hasPrePage(int currentPage){ e>_Il']Mb
return currentPage == 1 ? false : true; ]nx5E_j2
} _I#a`G
@?[}\9dW
privatestaticboolean hasNextPage(int currentPage, D~f[ R g
-Rr Qv(
int totalPage){ M_#^zo
"x
return currentPage == totalPage || totalPage == S(5&%}QFQ
f:/"OCig
0 ? false : true; @@+BPLl
} )9V8&,
#}nDX4jI
8FT@TUFb
} ZTi KU)
'<hgc
fzjZiBK@
C +S>;1
T |h'"3'
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 0"xD>ue&
_!E/em
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 d/` d:g
:@sjOY
做法如下: TM`6:5ONv
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 w?A6S-z
p!p:LSk"/b
的信息,和一个结果集List: ,Zs*07!$f
java代码: [O^mG
9
Q~$hx{foN
Gq;!g(
/*Created on 2005-6-13*/ l=ZX9<3
package com.adt.bo; q
`^5<
IM&l%6[).
import java.util.List; 4j-%I7
s7na!A[
import org.flyware.util.page.Page; oD7^9=#
_[ufH*
/** >$N ?\\#
* @author Joa sGFC?1r?\
*/ OA8iTn
publicclass Result { aX(Y
`g)|
OW1\@CC-69
private Page page; Om C
F8:\/
+p_>fO
private List content; f-a+&DB9
{t QZqqdn@
/** 5jK9cF$>
* The default constructor g,""j`
*/ f!+G1z}iA
public Result(){ ]sV) '-
super(); CC{{@
} [[VB'Rs
8/+x1, S%
/** aj@<4A=;
* The constructor using fields K6@9=_A
* P)&qy .+E0
* @param page b0lZb'
* @param content 2W vf[2Xw
*/ }|(v0]
public Result(Page page, List content){ X,i^OM_
this.page = page; 2sNV09id
this.content = content; tk,Vp3p
} \TTt!"aK
04QY
x}a
/** Qwu~{tf+'
* @return Returns the content. 137:T:
*/ 7q|51rZz
publicList getContent(){ 8d*W7>rq
return content; jp P'{mc
} Wd/m]]W8Q
r@]iy78
j
/** .3< sv
* @return Returns the page. zkmfu~_)
*/ c:sk1I,d~^
public Page getPage(){ >Yt+LdG!-
return page; @6:J$B~)u
} 29AWg(9?aS
LKe~
/** t{RdqAF
* @param content =6LF_=}
* The content to set. |sklY0?l(
*/ sj\kp
ni
public void setContent(List content){ )-_To&S*
this.content = content; $kCLS7 *
} [nG@
3n
oV Hh
/** \?rBtD(
* @param page &WAJ;7f
* The page to set. ju {\7X5
*/ }KCb5_MDF
publicvoid setPage(Page page){ M~t;&po
this.page = page; 5>*~1}0T
} fPu,@
L
} 8^|lsB}x?
OXCf
_vgFcE~E@
%q)*8
g6Nw].{
2. 编写业务逻辑接口,并实现它(UserManager, a2\r^fY/
:bV1M5
UserManagerImpl) DQRr(r~2Kj
java代码: yi$ Jk}w
ohj(1jt
9$oU6#U,h
/*Created on 2005-7-15*/ 1feS/l$
package com.adt.service; pX v@QD#!
t
(>}
import net.sf.hibernate.HibernateException; &S|%>C{P.w
hAv.rjhw_
import org.flyware.util.page.Page; EAi!"NJ
tWN hFQ'
import com.adt.bo.Result; Eggdj+
wEJ) h1=)^
/** s`Z'5J;S
* @author Joa !Al?B9KJ
*/ 22gk1'~dO
publicinterface UserManager { .S=^)
?cdjQ@j~h
public Result listUser(Page page)throws 9XSZD93L
us
TPr
HibernateException; ~Dz`O"X3
?*h2:a$
} &mJ
+#vT
h8me.=S&
WC<K(PP
qS{E+) P
s#*T(pY
java代码: 2AK]x`GY
Gcz@z1a=n
4OOH
3O
/*Created on 2005-7-15*/ tjIT4
package com.adt.service.impl; Yf=Puy}q
3Sb'){.MT+
import java.util.List; .*zWm
]-b`uYb
import net.sf.hibernate.HibernateException; Q7vTTn\
7-u['nFJ
import org.flyware.util.page.Page; q!+&|F
import org.flyware.util.page.PageUtil; L 2k?Pl
<5wk~|@t
import com.adt.bo.Result;
<B%s9Zy
import com.adt.dao.UserDAO; V<%eWT)x7C
import com.adt.exception.ObjectNotFoundException; 9;*-y$@
import com.adt.service.UserManager; &>]c"?C*
;5(ptXX1W
/** 8vL2<VT;
* @author Joa /PuN+M
*/ ,m)k;co^
publicclass UserManagerImpl implements UserManager { !QTfQ69Y0
;@R=CQ6
private UserDAO userDAO; 2GRdfX
]s))O6^f
/**
l,n
V*Z
* @param userDAO The userDAO to set. bXw!fYm&
*/ fi.[a8w:W
publicvoid setUserDAO(UserDAO userDAO){ QSxR@hC
this.userDAO = userDAO; 3w-0IP]<
} WK<:(vu.
6pCQP
c*A
/* (non-Javadoc) tin5.N)"z
* @see com.adt.service.UserManager#listUser ra4$/@3n
7\?0d!
(org.flyware.util.page.Page) IW<nfg
*/
!8V
public Result listUser(Page page)throws {r,MRZaa
RMfKM!
vE
HibernateException, ObjectNotFoundException { 2Vn~o_ga
int totalRecords = userDAO.getUserCount(); wcI?.
if(totalRecords == 0) +KzbaBK
throw new ObjectNotFoundException ` ,O#r0m
&=-ZNWNo
("userNotExist"); qlJzXq{|`
page = PageUtil.createPage(page, totalRecords); (WISf}[l;
List users = userDAO.getUserByPage(page); *49lM;
returnnew Result(page, users); [$<\*d/
} ..5rW0lr
(&)PlIi7
} 8wXnc%
nbECEQ:|B
dpPu&m+
kU
{>hG4
5@kNvi
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 oXxY$x*R1
\[57Dmo
询,接下来编写UserDAO的代码: ls928
3. UserDAO 和 UserDAOImpl: |v6kZ0B<
java代码: 3m#/1=@o
aA|<W
g
XJ3p<
/*Created on 2005-7-15*/ Ww[Xqmg
package com.adt.dao; P,}cH;w6Ck
A./VO
import java.util.List; `v|w&ty*
1ab_^P
import org.flyware.util.page.Page; 0S%xm'|N
l
7XeZ} S
import net.sf.hibernate.HibernateException; $:i%\7=
1j!LK-
/** w I7iE4\vz
* @author Joa 1_of;=9V
*/ KS3>c7
publicinterface UserDAO extends BaseDAO { \Xr
Sn_p-
I+4#LR3;
publicList getUserByName(String name)throws =G9 9U/
U_8 Z&
HibernateException; fVXZfq6
6`
8H k;
publicint getUserCount()throws HibernateException; R.(fo:ve>
0,z3A>C
publicList getUserByPage(Page page)throws dx&!RK+
#aeKK7[
HibernateException; Vx<`6uv
XB.xIApmy
} Nf!g1D"U
`+\6;nM
hn-!W;j
/Z ?$!u4I
Bo#,)%80
java代码: zJ=lNb?q
NR6wNz&81
+&*D7A>~p
/*Created on 2005-7-15*/ ILU7Yhk
package com.adt.dao.impl; Tx19\\r
;K$ !c5
import java.util.List; i0TbsoKh:
(\8~W*ej"
import org.flyware.util.page.Page; RXD*;B$v
X>la!}sV
import net.sf.hibernate.HibernateException; UD!-.I]
import net.sf.hibernate.Query; t4P`#,:8
xk:=.Qqh
import com.adt.dao.UserDAO; 'e(]woe
"PD^]m
/** kF@Z4MB}yr
* @author Joa VL?sfG0
*/ Mjon++>Z
public class UserDAOImpl extends BaseDAOHibernateImpl wwuM!Z+
k Xg&}n7
implements UserDAO { Lhz*o6)
sc0.!6^'V
/* (non-Javadoc) =.48^$LWx
* @see com.adt.dao.UserDAO#getUserByName \x7^ly$_
h]>QGX[kC
(java.lang.String) P2!+ZJ&
*/ 28!
ke
publicList getUserByName(String name)throws "M!]t,?S
f'oO/0lx
HibernateException { sOyL
String querySentence = "FROM user in class ^cnTZzT#Q
s 0To^I
com.adt.po.User WHERE user.name=:name"; CiNOGSlDj
Query query = getSession().createQuery 2bnYYQ14:
z%Eok
(querySentence); M/mm2?4
query.setParameter("name", name); dHsI<