Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ]9!Gg
Vs2 v j
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 /v<e$0~s<
h8Dtq5t4
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 ?h>(&HjWV
Gl3 `e&7
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 =|DkD-
O
$i5G7b
。 s.k`];wo
S^_JC
分页支持类: x`j_d:C~G
AmUe0CQ:k'
java代码: arpJiG~JR
8trm`?>
'Q^G6'(SaK
package com.javaeye.common.util; \oD=X}UQw(
x3:ZB
import java.util.List; z{<q0.^EFh
Lx4H/[$6D
publicclass PaginationSupport { l,~ N~?
o
=jX
publicfinalstaticint PAGESIZE = 30; 5VY%o8xXa
-NI@xJO4(;
privateint pageSize = PAGESIZE; Y6[] wUJ
DU*Hnii
privateList items; exa}dh/uC
(RI>aDGRH
privateint totalCount; Lt#:R\;&
}K qw\]`
privateint[] indexes = newint[0]; A=@V LU4%
'RN"yMv7l
privateint startIndex = 0; Ezo" f
3 8ls 4v3
public PaginationSupport(List items, int )aO!cQ{s
-&HoR!af
totalCount){ "1pZzad
setPageSize(PAGESIZE); ZFd{q)qe
setTotalCount(totalCount); `rRg(fCN!M
setItems(items); _YD<Q@
setStartIndex(0); +eH=;8
} [jmAMF<F
+L<w."WG
public PaginationSupport(List items, int 9h)P8B.>M
eN7yjd'Y6
totalCount, int startIndex){ PT=2LZ
setPageSize(PAGESIZE); T!O3(
setTotalCount(totalCount); LXOF{FG
setItems(items); OHXeqjhy
setStartIndex(startIndex); `04Y ;@w
} u]++&~i
&nY2u-Q
public PaginationSupport(List items, int !'UsC6Y4
e>s.mH6A
totalCount, int pageSize, int startIndex){ ^AC+nko*
setPageSize(pageSize); NJz*N%VWD
setTotalCount(totalCount); [s&
y_[S
setItems(items); \ &|w;
setStartIndex(startIndex); vb4G_X0S
} u6CMRZ$
22H=!.DJ
publicList getItems(){ S7\jR%pb
return items; yO69p
} Zzzi\5&gU
iJ~iJ'vf
publicvoid setItems(List items){ TBLk+AR
this.items = items; ;/]c^y
} u9[w~U#
n ;$}pg~
publicint getPageSize(){ pRyS8'
return pageSize; ::h02,y;1%
} Ts ?>"@
5w-G]b
publicvoid setPageSize(int pageSize){ I.n{ "=$B@
this.pageSize = pageSize; 3hpz.ISk
} Et[QcB3
I n%yMH8
publicint getTotalCount(){ 1Y"y!\t7G
return totalCount; GCmVmOdKr
} Z6HkQ=A64
. KSr@Gz
publicvoid setTotalCount(int totalCount){ _jI)!rfb
if(totalCount > 0){ >0G}, S
this.totalCount = totalCount; $y |6<
int count = totalCount / s(DaPhL6Qm
2%, ' }Bus
pageSize; mZ.6Njb
if(totalCount % pageSize > 0) "{1}
count++; fCo2".Tk
indexes = newint[count]; r E*u
for(int i = 0; i < count; i++){ c`[uQXv
indexes = pageSize * (/UMi,Ho
[8(9.6f
i; KARQKFp!C>
} LZ<(:S
}else{ ur_"m+
this.totalCount = 0; ry<}DK<u
} Ik2szXh[J
} N4JL.(m){I
(VF4]
publicint[] getIndexes(){ YuZ
return indexes; C{Xk/Er5<
} ?p\II7
7m)ykq:?
publicvoid setIndexes(int[] indexes){ 7=[O6<+o
this.indexes = indexes; V,%5
hl'&
} %)@(Tye -
7]+'%Uwu)
publicint getStartIndex(){ yeh adm\
return startIndex; k*+ZLrT
} G"R>a w
`x^,k%
:4
publicvoid setStartIndex(int startIndex){ 6xQe!d3>s3
if(totalCount <= 0) i /U{dzZ
this.startIndex = 0; t
1'or
elseif(startIndex >= totalCount) $@!&ML
this.startIndex = indexes +_K;Pj]x
dg@/HLZ
[indexes.length - 1]; :a<TV9?H0
elseif(startIndex < 0) rsj}hS$
this.startIndex = 0; ]m,p3
else{ >]N0w
this.startIndex = indexes <'yC:HeAwD
9w<_XXQ
[startIndex / pageSize]; 0a-:x4
} u~Cqdr5
\l
} I&@@v\$*
\.-y
LS.
publicint getNextIndex(){ FbT&w4Um=
int nextIndex = getStartIndex() + ].+G-<.:
xa axj
pageSize; 5nw9zW
:'
if(nextIndex >= totalCount) [ESQD5&
return getStartIndex(); .j@n6RyN
else @ dU3d\!}
return nextIndex; 4'e8VI0
} NjMLq|X
H[yLlv
publicint getPreviousIndex(){ Sgk{NM7|k
int previousIndex = getStartIndex() - %R5MAs&-5
-]MP,P%
pageSize; tm#y`1-
if(previousIndex < 0) JS.'v7
return0; 0-O.*Q^
else 2xxwQwg8
return previousIndex; \O4=mJ
} n;Wf|>
{oC69n:
} K#yH\fn8
R')GQ.yYq
+*~3"ww<
87*[o
抽象业务类 `Wt~6D
e
java代码: Z
' 96d
mT$tAwzTC{
"N"k8,LH
/** _Dt TG<E
* Created on 2005-7-12 [vT,zM
*/ N8Q{4c
package com.javaeye.common.business; =!Cvu.~},
]8z6gDp
import java.io.Serializable; ' vClZGQ1
import java.util.List; mTbPzZ4
?5M2DLh~
import org.hibernate.Criteria; tH!z7VZ
import org.hibernate.HibernateException; d'J?QH!N0
import org.hibernate.Session; N%i<DsK.u6
import org.hibernate.criterion.DetachedCriteria; 9~af\G
import org.hibernate.criterion.Projections; {u][q
&n
import P Qay
sdb
+u.L6GcB
org.springframework.orm.hibernate3.HibernateCallback; f%l#g ]]
import :
s3Vl
9e6{(
org.springframework.orm.hibernate3.support.HibernateDaoS mw%_yDZ{
6u8fF|s
upport; a
OHAG
Darkj>$\
import com.javaeye.common.util.PaginationSupport; L4-Pq\2
7dW&|U
public abstract class AbstractManager extends ,~w)@.
06O
HibernateDaoSupport {
/PS]AM
sP8B?Tn1W
privateboolean cacheQueries = false; ^ 9E(8DD
!(o2K!v0
privateString queryCacheRegion; D/>5\da+y
a-=apD1RvG
publicvoid setCacheQueries(boolean w+D5a
VJ
9)X<}*(qo
cacheQueries){ 4\RuJx
this.cacheQueries = cacheQueries; )QT+;P.
} r}bKVne
6U]7V
publicvoid setQueryCacheRegion(String 6<6_W#
iDN,}:<V
queryCacheRegion){ )2hoO_l:
this.queryCacheRegion = wkw/AZ{27
tam/FzVw
queryCacheRegion; wxrT(x|
} Reo0ZU>
wtyu"=
publicvoid save(finalObject entity){ e2F7G>q:5
getHibernateTemplate().save(entity); sP!qv"u
} mer{Jys
Rl8-a8j$f.
publicvoid persist(finalObject entity){ ~VKXL,.
getHibernateTemplate().save(entity); $T0[
} WDR!e2G
nrS_t
y
publicvoid update(finalObject entity){ 64@s|m*
getHibernateTemplate().update(entity); r8$TT\?~
} QJ?!_2Ax
st>t~a|T
publicvoid delete(finalObject entity){ =uTV\)
getHibernateTemplate().delete(entity); >Fh@:M7z
} '@P[fSQ
Ckp=d
publicObject load(finalClass entity, @YELqUb*
p
IToy;]
finalSerializable id){ ?HTwTi5!)
return getHibernateTemplate().load /|f]L9)2<
e^TF.D?RS
(entity, id); +V^_ksi\
} 1g+<`1=KT
Yn/-m
Z
publicObject get(finalClass entity, 1F/&Y}X
@ So"(^
finalSerializable id){ ~sD'pS
return getHibernateTemplate().get /jAs`"U
T~Cd=s(T"
(entity, id); '
r/1+.
} D?R z|
C/=ZNl9"fn
publicList findAll(finalClass entity){ We2=|AB
return getHibernateTemplate().find("from ZWH`s
|)?T([
" + entity.getName()); U$}]zaB
} w.\:I[
th{h)( +H
publicList findByNamedQuery(finalString vP!gLN]TV
OJaU,vQ#
namedQuery){ (XQG"G%U6W
return getHibernateTemplate Qd&j~cG@
so*7LM?ib>
().findByNamedQuery(namedQuery); \9DTf:!4Z
} |rQ;|+.
Rx.0P6s
publicList findByNamedQuery(finalString query, nYHk~<a
J4<*KL~a
finalObject parameter){
Nnw iH
return getHibernateTemplate ;N|6C+y
\=JKeL|6[S
().findByNamedQuery(query, parameter); '
BpRi N
} R0WJdW#
"d'@IN
publicList findByNamedQuery(finalString query, t@\0$V
\X
p5\b&~
g
finalObject[] parameters){ tx.sUu6
return getHibernateTemplate apXq$wWq{D
'Tn$lh
().findByNamedQuery(query, parameters); ]So%/rOvX
} Qa=;Elp:[
"F&uk~ b$
publicList find(finalString query){ #R$!|
return getHibernateTemplate().find `Cc<K8s8
VQyDd~Za
(query); uB
BE!w_
} ZyG528O22
wC19
publicList find(finalString query, finalObject 3c)LBM
qXW5_iX
parameter){ P;GUGG*W
return getHibernateTemplate().find .Kx5Kh{
0(n/hJ
(query, parameter); btOC\bUMfD
} N^)OlH
ZHT.+X:_
public PaginationSupport findPageByCriteria ;rX4${h
*-7O|
''
(final DetachedCriteria detachedCriteria){ ` WVQp"m
return findPageByCriteria )9$Xfq/
;]gph)2cd
(detachedCriteria, PaginationSupport.PAGESIZE, 0); XX =A1#H
} |<E%hf
TUT>*
public PaginationSupport findPageByCriteria E?V:dr
^>>Naid
(final DetachedCriteria detachedCriteria, finalint ?Gb
18m
li'#< "R?'
startIndex){ =8]'/b
return findPageByCriteria \6o
~ i
d%<Uh(+:
(detachedCriteria, PaginationSupport.PAGESIZE, W\"cp[b
E4PP&'
startIndex); i<l)To -
} wXP1tM8T
J;qH w[6
public PaginationSupport findPageByCriteria 0F"xU1z,
MDRSI g
(final DetachedCriteria detachedCriteria, finalint z~F!zigNAc
83@+X4ptp
pageSize, !e?\>
'
finalint startIndex){ E @7! :
return(PaginationSupport) u{si
&{$\]sv
getHibernateTemplate().execute(new HibernateCallback(){ {_ocW@@
publicObject doInHibernate J4<- C\=4
`Tab'7
(Session session)throws HibernateException { [p(Y|~
Criteria criteria = :)+cI?\#
Tsa&R:SE
detachedCriteria.getExecutableCriteria(session); SkY|.w.
int totalCount = %FwLFo^v
BQm H9g|2
((Integer) criteria.setProjection(Projections.rowCount {W0@lMrD
J &c}z4
()).uniqueResult()).intValue(); ]_-<[0
criteria.setProjection "`lRX
# H4dmnV
(null); ruoiG?:T
List items = ex-`+cF
b*$^8%
criteria.setFirstResult(startIndex).setMaxResults }hGbF"clqg
~q<UE\H
(pageSize).list(); TygRG+G-
PaginationSupport ps = >8ePx,+!
3]wV`mD
new PaginationSupport(items, totalCount, pageSize, c1c0b|B!U
x.'O_7c0:
startIndex); K]RkKMT,
return ps; >J4_/p>Qs
} *-2u0 %
}, true); K%S k{'
} Zf|f $1-
xD1w#FMlQs
public List findAllByCriteria(final K2&pTA~OR
^NP" m
DetachedCriteria detachedCriteria){ ^Xh9:OBF
return(List) getHibernateTemplate TK'(\[E
t&ngOF
().execute(new HibernateCallback(){ E_FseR6
publicObject doInHibernate K{N#^L!
mI}'8.
(Session session)throws HibernateException { /<GygRs
Criteria criteria = qUCiB}
GeE|&popO
detachedCriteria.getExecutableCriteria(session); k*M1m'1
return criteria.list(); oSxHTbp?
} .a$][Jny
}, true); Jyvc(~x
} N~SG=\rP;o
"xw2@jGpG
public int getCountByCriteria(final Z[|(}9v?~
!IP[C?(nB
DetachedCriteria detachedCriteria){ ^/c&Ud
Integer count = (Integer) =8[HC}s|$
aVd{XVE
getHibernateTemplate().execute(new HibernateCallback(){ ~W!sxM5(*
publicObject doInHibernate w+PbT6;
1'M<{h<sP
(Session session)throws HibernateException { --y.q~d
Criteria criteria = i4AmNRs
C5F}*]E[y
detachedCriteria.getExecutableCriteria(session); hb`(d_= 7F
return %A?Ym33
SZEX;M
criteria.setProjection(Projections.rowCount {4UlJ,Z.n
x2;92I{5C,
()).uniqueResult(); RoPz?,u
} Yk[yG;W
}, true); 9;kWuP>k4u
return count.intValue(); )'92{-A0
} (eHvp
} <Cm:4)~
)t0t*xu#
jRzR`>5
.BZw7
YV
(1*?2u*j
~,.Agx
用户在web层构造查询条件detachedCriteria,和可选的 ^KmyB6Yg
BT>8
startIndex,调用业务bean的相应findByCriteria方法,返回一个 Z3=t"
Es1Yx\/:
PaginationSupport的实例ps。 }wz )"
db4Ol=
ps.getItems()得到已分页好的结果集 LKtr>u
ps.getIndexes()得到分页索引的数组 pz~AsF
ps.getTotalCount()得到总结果数 )N<>L/R
ps.getStartIndex()当前分页索引 g;Bq#/w
ps.getNextIndex()下一页索引 XswEAz0=
ps.getPreviousIndex()上一页索引 (q*Za
,:j^EDCsaJ
oljl&tuQy
+ ,0RrD )
G
?H`9*y
OP{ d(~+
-&y{8<bu4H
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 4>gkXfTF
XV]`?
,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 %.[t(F
|{<g-)
一下代码重构了。 %mg |kb6n
=2#
C{u.
我把原本我的做法也提供出来供大家讨论吧: dyD=R
I"y=A7Nq
首先,为了实现分页查询,我封装了一个Page类: r)q6^|~47
java代码: e=QnGT*b5
/\(0@To
mq do@
/*Created on 2005-4-14*/ UeX3cD
package org.flyware.util.page; b>Iqk
fo^M`a!va0
/** _z#zF[%
* @author Joa ;VNwx(1l`
* W_ngB[
*/ ^;!A`t
publicclass Page { G/bWn@
qJKD|=_
/** imply if the page has previous page */ hT#[[md"
privateboolean hasPrePage; `fj(xrI
iO(9#rV
/** imply if the page has next page */ Atzp\oO
privateboolean hasNextPage; dq[j.Nmq
JY~s-jxa
/** the number of every page */ /)e&4.6
privateint everyPage; x?VX,9;j
&S]\)&Yt
/** the total page number */ n(0O'nS^
privateint totalPage; rX)PN3TD
; P&Ka
/** the number of current page */ W:ih#YW_F
privateint currentPage; %DbL|;z1
y!h$Z6.
/** the begin index of the records by the current D/"[/!
Zm4IN3FGLv
query */ Ul)2A
privateint beginIndex; 8yF15['
Q+[gGe
JUF
n'U*8ID
/** The default constructor */ "9>~O`l,
public Page(){ IF(W[J
0bVtku K;G
} FDkRfh K
}[SWt3qV1
/** construct the page by everyPage %F` cNw]
* @param everyPage k^:$ETW2
D
* */ j]6Z*AxQ
public Page(int everyPage){ &Ru|L.G`
this.everyPage = everyPage; 4t|ril``]
} Eo!1
WRruF
a]Bm0gdrO
/** The whole constructor */ != _:*U)-'
public Page(boolean hasPrePage, boolean hasNextPage, x}?y@.sn8
cO.U*UTmX
~
b!mKyrZ
int everyPage, int totalPage, Ola>] 0l
int currentPage, int beginIndex){ QS4sSua
this.hasPrePage = hasPrePage; v[q2OWcL
this.hasNextPage = hasNextPage; ;oH17
this.everyPage = everyPage; }3!83~Qbx
this.totalPage = totalPage; snK$? 9vh
this.currentPage = currentPage; &HNJ'
this.beginIndex = beginIndex; wWKC.N
} }5z6b>EI9a
- /]ro8V$
/** .9#4qoM'
* @return |<96H8
* Returns the beginIndex. U}x2,`PI
*/ h
\hQ
publicint getBeginIndex(){ 5? &k? v@
return beginIndex; rbHrG<+7zO
} Ou"QUn|
f<=
#WV
/** <x,u!}5J
* @param beginIndex F42r]k
* The beginIndex to set. Z,M?!vK
*/ ;cH|9m:Y
publicvoid setBeginIndex(int beginIndex){ W/<]mm~95
this.beginIndex = beginIndex; dE7 kd=.o
} [rC-3sGar
rRRiqmq
/** 3k`"%R.H
* @return 7hZCh,O
* Returns the currentPage. 2Vxr
*/ @NWjYHM[`
publicint getCurrentPage(){ 2`Ub;Nn29
return currentPage; 4_TxFulX.
} d kHcG&)
22"M#:r$
/** v`A^6)U#M
* @param currentPage o7i/~JkTP
* The currentPage to set. QZ$94XLI
*/ BC ]^BKP
publicvoid setCurrentPage(int currentPage){ A,ttn5Sh?
this.currentPage = currentPage; ^0_ *AwIcN
} bg[k8*.:F
'Cd8l#z7
/** =;-/( C
* @return `re]Q0IO
* Returns the everyPage. @vh3S+=M
*/ \$}xt`6p
publicint getEveryPage(){ Oh9wBV
return everyPage; V@&zn8?
} ^n!{ vHz
iJv4%|9
/** b#(SDNo6
* @param everyPage >*(4evU
* The everyPage to set. UK*+EEv
*/ Ir|Q2$W2^c
publicvoid setEveryPage(int everyPage){ {9vvj
this.everyPage = everyPage; [X ]\^
} :{pvA;f
[]/=!?5B
/** y8HLrBTza
* @return {";5n7<<)
* Returns the hasNextPage.
LKieOgX
*/ %H75u6
publicboolean getHasNextPage(){ ^N#kW-i
return hasNextPage; 'C)^hj.
} '}dlVf
pN6!IxN$
/** zhY VMQ
* @param hasNextPage 3Q*K+(`{
* The hasNextPage to set. [wG?&l$.KB
*/ tQ_;UQlX
publicvoid setHasNextPage(boolean hasNextPage){ {:xINQ=}D
this.hasNextPage = hasNextPage; IzF7W?k
} m8,P-m
H_sLviYLu
/** {>tgNW>)
* @return h@=H7oV7k
* Returns the hasPrePage. VJJGTkm
*/
*>ju1f
publicboolean getHasPrePage(){ xRpL\4cs
return hasPrePage; 'uBXSP#
} ny%-u&1k
7m_Jb5
/** ;Xg6'yxJ
* @param hasPrePage G,9osTt/
* The hasPrePage to set. 4SCb9|/Q
*/ A(X~pP&oF
publicvoid setHasPrePage(boolean hasPrePage){ 5<w"iqZ\?N
this.hasPrePage = hasPrePage; uNZJNrV%
} wvvMesX<L
}WS%nQA
/** )` -b\8uw
* @return Returns the totalPage. ^Crl~~Gk`
* )[yM4QFl
*/ u6IEBYG ((
publicint getTotalPage(){ \!j{&cJ
return totalPage; S9d+#6rn
} gm~Ka%O|F
NX&mEz
/** km,}7^?F0r
* @param totalPage mV^+`GWvo
* The totalPage to set. y5B4t6M(
*/ v/=O:SM}
publicvoid setTotalPage(int totalPage){ jCqs^`-
this.totalPage = totalPage; _;3xG0+
} 6DqV1'
&MsnQP
} V^B'T]s
&:`T!n
L$6{{Tw"2
:$."x
'
Ar7vEa81
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 L^3~gZ
,u7:l
个PageUtil,负责对Page对象进行构造: "^VKs_U8o
java代码: %myg67u
x9XQ
u'M\m7
/*Created on 2005-4-14*/ |K| c
package org.flyware.util.page; :"7V,UP
@
9iGUE
import org.apache.commons.logging.Log; ^d Fdw\
import org.apache.commons.logging.LogFactory; gd^1c}UZX
cdVh_"[
/** 'hfQ4EN
* @author Joa g0GCg
* {rQ6IV3=
*/ #]<j.Fc`
publicclass PageUtil { /{
Lo0
.vYU4g]
privatestaticfinal Log logger = LogFactory.getLog ?RJ
)u
pt<!b0G
(PageUtil.class); &Q
7Q1`S
+pp|Qgr 3
/** RhIRCN9
* Use the origin page to create a new page zC#[
* @param page (@@t,\iF
* @param totalRecords S"0<`{Gv
* @return 3<sYxA\?w
*/ pE<dK.v6
publicstatic Page createPage(Page page, int pe$"
nUy|
\)'s6>58|
totalRecords){ F+
qRC_C>O
return createPage(page.getEveryPage(), 1^^<6e
V`qHNM/t
page.getCurrentPage(), totalRecords); iV;X``S
} u^T)4~(
&QFg=
/** bzD <6Z
* the basic page utils not including exception hi4#8W
DjUif "v
handler d6,SZ*AE
* @param everyPage .E}fk,hLB
* @param currentPage k44sV.G4L
* @param totalRecords L;$Gn"7~
* @return page unu%\f>^4
*/ $}RBK'cr}
publicstatic Page createPage(int everyPage, int gBb+Q,
3*C9;Q}
currentPage, int totalRecords){ |pxM8g1w
everyPage = getEveryPage(everyPage); qE?*:$
currentPage = getCurrentPage(currentPage); %_C!3kKv~
int beginIndex = getBeginIndex(everyPage, 6&/n/g
sT:$:=
currentPage); I:M]#aFD
int totalPage = getTotalPage(everyPage, 6qg_&woJ3
0.C[/ u[
totalRecords); dnt: U!TW@
boolean hasNextPage = hasNextPage(currentPage, hAq7v']m
A+v6N>}*
totalPage); }tue`">h
boolean hasPrePage = hasPrePage(currentPage); 60p*$Vqy
h^o>9s/|/H
returnnew Page(hasPrePage, hasNextPage, |^p7:)cy
everyPage, totalPage, L5$r<t<
currentPage, X:Z4QqT
^-Ob($(\
beginIndex); )Zud|%L
} :k9n
9
d Bn/_
privatestaticint getEveryPage(int everyPage){ tDn{;ED<
return everyPage == 0 ? 10 : everyPage; x[l_dmq
} .:gZ*ks~
6\"g,f
privatestaticint getCurrentPage(int currentPage){ 9>,$q"M}?
return currentPage == 0 ? 1 : currentPage; }jTCzqHW]
} uFPJ}m[>5
yneIY-g(p
privatestaticint getBeginIndex(int everyPage, int 40,u(4.m*
k\(LBZ"vR
currentPage){ pJ)PVo\cV
return(currentPage - 1) * everyPage; b.HfxYt(
} trD-qi
^W!w~g+
privatestaticint getTotalPage(int everyPage, int #mu3`,9V
1N8gH&oF
totalRecords){ TY,5]*86I&
int totalPage = 0; }i,LP1R
o"h*@.
if(totalRecords % everyPage == 0) aVTTpMY
totalPage = totalRecords / everyPage; ~2 aR>R_nT
else ZH6#(;b
totalPage = totalRecords / everyPage + 1 ; 4rkj$
cb|cY Co5
return totalPage; w0W9N%f#=
} pxC:VJ;
3i1e1Lj1
privatestaticboolean hasPrePage(int currentPage){ EG=~0j ~
return currentPage == 1 ? false : true; <_XyHb-
} JG6"5::
cTlitf9
privatestaticboolean hasNextPage(int currentPage, qz]b8rX
2^Y@e=^A
int totalPage){ P]V/<8o.53
return currentPage == totalPage || totalPage == YT:])[gVV
e'%"G{(D
0 ? false : true; PEA<H0
} 2|a@,TW}-
j;%RV)e
;&="aD
} }t.J;(ff:
2Cy">Exl
ZWJ%t'kF
J*4byu|
}~/u%vI@M5
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。 ::'DWD1
uh,~CvXU]
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 >wsS75n1
FUy!j|W6f
做法如下: 2AN6(k4o
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 s^O>PEX&<I
E<=h6Ha
的信息,和一个结果集List: x.gRTR`7(
java代码: M? 7CBqZ
8&d s
r7dvj#^
/*Created on 2005-6-13*/ +[W_Jz
package com.adt.bo; f+A!w8E
sT&O %(
import java.util.List; UC@&! kM
42 6l:>D(
import org.flyware.util.page.Page; gZ{q85C.>
UD.&p'^ /{
/** wO\,?SI4
* @author Joa s+mNr3
*/ y~ubH{O#
publicclass Result { -v]vm3Na
ds>V|}f[
private Page page; p~X=<JM
ChVur{jR
private List content; 1rhEk|pGZ
funHznRR
/** xw1@&QwM
* The default constructor cSMiNR
*/ z
xe6M~+
public Result(){ q ERdQ~M,
super(); QY$Z,#V)
} vsFRWpq
MqA%hlq
/** ;0R|#9oX_
* The constructor using fields ^LaOl+;S
*
N\Nw mx
* @param page SLCV|@G
* @param content j?eWh#[K"
*/ {'(1c)q>
public Result(Page page, List content){ 0iy-FV;J
this.page = page; I\8f`l
this.content = content; | dLA D4%
} A4kYEA
ez2rCpA
/** K/^70;/!.
* @return Returns the content. d5b \kR r
*/ ^M51@sXI7
publicList getContent(){ I $5*Puy#
return content; IUK!b2!`
} +y}4^3Vx^
`#v(MK{9+V
/** EUVB>%P
* @return Returns the page. d-cK`pSB
*/ ="M7F0k
public Page getPage(){ qa|"kRCO
return page; VW,"
dmC
} ]yR0"<W^xO
'Dh+v3O
/** N sUFM
* @param content w-[A"M]I
* The content to set. Ng;K-WB\
*/ >icL,n"]
public void setContent(List content){ "0ITW46n
this.content = content; HOEjLwH
} )JYt zc
#gHs!b-g@
/** |?a 4Nl?
* @param page n\U3f M>N
* The page to set. #<^ngoOj
*/ Ax'jNol
publicvoid setPage(Page page){ `63?FzTy
this.page = page; ZO^Y9\L
} xlJ8n+
} /MHml0u
.H.#W1`
e~wuoE:M3
=*ZQGM 3w
aa:97w~s0
2. 编写业务逻辑接口,并实现它(UserManager, &7gL&AY8
ZO`{t1
UserManagerImpl) 5LPyPL L
java代码: |~6X:
M61
N*dO'ol
cqr4P`Oj
/*Created on 2005-7-15*/ 9}\{0;9
package com.adt.service; 4{[cXM8*j
|VY+!
import net.sf.hibernate.HibernateException; xj1FCT2
]i}3`e?
import org.flyware.util.page.Page; K1vm
[Ne
\P3[_kbf1
import com.adt.bo.Result; AbWnDqv
jK#[r[q{
/** ;bC163[
* @author Joa 'CTvKW
*/ 2 g)W-M
publicinterface UserManager { s@WF[S7D
f1Ak0s,zrc
public Result listUser(Page page)throws I 0/enL
T'n~QfU
HibernateException; qac4GZ
";I|\ T
} GMY"*J<E
~"oxytJ
71nI`.Z
W6b5elH@
{5ujKQOcR
java代码: ]3+xJz~=
j'z}m+_?
5CSihw/5
/*Created on 2005-7-15*/ G=[=[o\
package com.adt.service.impl; q~3dbj
O<@S,/Q4
import java.util.List; U[!x
0M
$@[`/Uh
import net.sf.hibernate.HibernateException; OOa}+^-j
!9$xfg}
import org.flyware.util.page.Page; [Rqv49n*V
import org.flyware.util.page.PageUtil; J9tQ@3{f
Sdc
yL%6!
import com.adt.bo.Result; {AJcYZV
import com.adt.dao.UserDAO; }'?N+MN
import com.adt.exception.ObjectNotFoundException; ;au-NY
import com.adt.service.UserManager; $;9zD11
SiD [54OM
/** R\L0
* @author Joa :/Zy=F9:
*/ }RGp)OFY&
publicclass UserManagerImpl implements UserManager { &&N]u e@>
2>E.Q@c
private UserDAO userDAO; uP'x{Pr)
*3S./C}
/** l.DC20bs
* @param userDAO The userDAO to set. 7?@s.Sz|fV
*/ L_>j
SP
publicvoid setUserDAO(UserDAO userDAO){ XQ+KI:g2
this.userDAO = userDAO; .?gpIZv
} '(JSU
MjO.s+I
/* (non-Javadoc) D6 2xC5
* @see com.adt.service.UserManager#listUser OygR5s +
jIZpv|t)
(org.flyware.util.page.Page) 07zbx6:t
*/ X[ERlw1q4Q
public Result listUser(Page page)throws ~*Fbs! ;,
CS:"F) at
HibernateException, ObjectNotFoundException { |@J:A!
int totalRecords = userDAO.getUserCount(); RHV&m()Q
if(totalRecords == 0) {b|:q>Be8
throw new ObjectNotFoundException RCFocOOn
xMk0Xf'_
("userNotExist"); <X7x
page = PageUtil.createPage(page, totalRecords); 6cCC+*V{
List users = userDAO.getUserByPage(page); YTiXUOj
returnnew Result(page, users); {8NnRnzU
} DE GEr-
,S|v>i,@
} |Rh%wJ
*vx!twu1o
r!qr'Ht<
F_m[EB
!N6/l5kn
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 3SRz14/W_R
&ukYTDM
询,接下来编写UserDAO的代码: ZDVz+L|p
3. UserDAO 和 UserDAOImpl: 83"Vh$&
java代码: .%{3#\
a$f$CjQ
Kh)SgJ3B@
/*Created on 2005-7-15*/ <NV[8B#k]
package com.adt.dao; 9{gY|2R_
6}aIb .j
import java.util.List; "Qf X&'09
`"N56
import org.flyware.util.page.Page; aP}kl[W
f'hrS}e
import net.sf.hibernate.HibernateException; }i32
Pt/dH+r`%
/** 5ua`5Hb;
* @author Joa (#Vkk]-p
*/ :iWW2fY
publicinterface UserDAO extends BaseDAO { PgNg1
Ae&470
publicList getUserByName(String name)throws l_K=7\N
;\P\0pI50
HibernateException; $wL
zaZL|
>t-9yO1XQq
publicint getUserCount()throws HibernateException; )aW;w |#n
wS*An4%G
publicList getUserByPage(Page page)throws t'msgC6=>u
WJefg
HibernateException; h J*2q"
Lh0qB)>
} &5]&6TD6
0n5{Wr$
jB+K)NXHL
!Cq2<[K#
!f
7CN<
java代码: -;/;d z;
LvlVZjT
p 8,wr )
/*Created on 2005-7-15*/ 4Wz@^7|V5
package com.adt.dao.impl; &xKln1z'
rJ2yi6TB\
import java.util.List; \'z&7;px
ZPrL)']
import org.flyware.util.page.Page; ~ YQC!x
Czj]jA(0f
import net.sf.hibernate.HibernateException; fq-zgqF<
import net.sf.hibernate.Query; K-%x]Fp=
Ns ?8N":
import com.adt.dao.UserDAO; ~b.C[s
{q=(x]C
/** Wn61;kV_)
* @author Joa PuKT0*_ 7
*/ OEz'&))J
public class UserDAOImpl extends BaseDAOHibernateImpl (9!$p|d*
A*;I}F
implements UserDAO { ya[][!.G
MHh>~Y(h
/* (non-Javadoc) ]njObU)[zr
* @see com.adt.dao.UserDAO#getUserByName H7&>c M
2=P.$Kx
(java.lang.String) &