Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 JcDcYB
Yy3g7!K5E
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 osdl dS
:7[20n}w
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 q71~Y:7f
i~0x/wSl_
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 3"HW{=
$\A=J
。 H%z9VJ*!0
waI:w,
分页支持类: 7uW=f kxT
+<1MY'>y
java代码: zt|DHVy
g ONybz6]
;S.o`z1GI
package com.javaeye.common.util; kzuI<DW
.ZK^kcyA
import java.util.List; s7>a
A4>j4\A[M
publicclass PaginationSupport { J70r`
iVe"iH
publicfinalstaticint PAGESIZE = 30; C_ 4(-OWq
FZ~^cK9g:
privateint pageSize = PAGESIZE; }@H(z
jC}2>_#m(
privateList items; =)mA.j}E2
]u<8jr
privateint totalCount; 1@W*fVn
`+0K~k|DC
privateint[] indexes = newint[0]; EYXHxo
Yw_^]:~
privateint startIndex = 0; mo()l8
!/RL.`!>
public PaginationSupport(List items, int QopA'm
')#!M\1,HQ
totalCount){ xh`4s
setPageSize(PAGESIZE); nc/F@HCB
setTotalCount(totalCount);
V
krjs0
setItems(items); gHmy?+)
setStartIndex(0); (29BS(|!
} F+Q(^Nk
thK4@C|X4
public PaginationSupport(List items, int fx3oA}
uoi~JF
totalCount, int startIndex){ * ,#SwZ
setPageSize(PAGESIZE); {&,MkWgG
setTotalCount(totalCount); fuao*L]
setItems(items); Lh
rU fy
setStartIndex(startIndex); G'IRqO*]
} @b{I0+li"/
uP NZ^lM
public PaginationSupport(List items, int # ;3v4P
ki=]#]rg
totalCount, int pageSize, int startIndex){ fZka$
4
setPageSize(pageSize); vMv?
fE"
setTotalCount(totalCount); f)#rBAkt
setItems(items); eB2a1<S&@
setStartIndex(startIndex); R.P|gk
} q'1
86L87
/n-!dXi
publicList getItems(){ o7sIpE9
return items; - xKa-3
} =GJ)4os
~b;u1;ne
publicvoid setItems(List items){ h6~H5X
this.items = items; ZBsV
} n&\DJzW\#
7Q>bJ Ek7
publicint getPageSize(){ /:-Y7M*
return pageSize; 1.IEs:(;
} He)vl.
HyGu3
publicvoid setPageSize(int pageSize){ A(6n- zL
this.pageSize = pageSize; Pe?=M[u2
} fb|%)A=
X]+z:!
publicint getTotalCount(){ "rU
2g
return totalCount; #,B+&SK{
} k.<OO
S2<evs1d
publicvoid setTotalCount(int totalCount){ &MJcLM]
if(totalCount > 0){ nXM[#~
this.totalCount = totalCount; D&*'|}RZ
int count = totalCount / khe.+Qfgj
1WUlBr/k
pageSize; &3CC |
if(totalCount % pageSize > 0) 6BH
P#B2j
count++; @5tGI U;1
indexes = newint[count]; %Fp1c K
for(int i = 0; i < count; i++){ , .]1N:
indexes = pageSize * J7FzOwd1h
(,^jgv|I
i;
`BzjDI:a
} _;'<}a
}else{ ;GV~MH-F
this.totalCount = 0; [5i}C
K_=
} Q/]t$
} MHPh!
,%d?gi"&
publicint[] getIndexes(){ R4g;-Ci->
return indexes; d:3OC&
} t
.-%@,s
.!Q*VTW
publicvoid setIndexes(int[] indexes){ =g{Hs1W
this.indexes = indexes; I4(z'C
} [
~:wS@%
O)%s_/UX
publicint getStartIndex(){ =O??W8u
return startIndex; X|4_}b> x
} ~%?LFR'
'Rq2x-72}
publicvoid setStartIndex(int startIndex){ m5
l,Lxj
if(totalCount <= 0) U#g,XJ
this.startIndex = 0; JIU8~D
elseif(startIndex >= totalCount) i{biQ|,.sL
this.startIndex = indexes 9CPr/q9'
]=vRjw
[indexes.length - 1]; 4Qj@:b
elseif(startIndex < 0) ):Pzsz7
this.startIndex = 0; S1U>Q~ZPA
else{ jg\FD51$
this.startIndex = indexes ZW%;"5uVm)
d7P'c!@+
[startIndex / pageSize]; BI6]{ ZC"
} "@(Sw>*o
} 2g
HRfTF
-(JBgM"
publicint getNextIndex(){ g27)$0&0
int nextIndex = getStartIndex() + RYZM_@5$t
bsv!z\}
pageSize; ]S7>=S
if(nextIndex >= totalCount) NudY9~
return getStartIndex(); yn|U<Hxl~H
else @M!nAQ8hY
return nextIndex; Ctx{rf_~
} ukc<yc].+?
Jxsch\
publicint getPreviousIndex(){ |Ng}ZLBM
int previousIndex = getStartIndex() - RC~ C}
kzmw1*J
pageSize; ,b9!\OWDF
if(previousIndex < 0) EI8KK o *
return0; L XHDX
else h@jk3J9^
return previousIndex; j^m x ,
} l?O%yf`s
)7 M
} tQ,3nI!|xF
gt\*9P
tvcM<
e20
D]?yGI_
抽象业务类 mGh8/Xt
java代码: V6kJoSyde
I78Q8W(5
*]*0uo
/** <2t%<<%
* Created on 2005-7-12 \pVNJy$`<
*/ f0 "_ {\
package com.javaeye.common.business; K;*B$2Z#k
[7Liken
import java.io.Serializable; KJi8LM
import java.util.List; \[L|
?fX`z(Z
import org.hibernate.Criteria; qnJs,"sn
import org.hibernate.HibernateException; ,qwVDYJ
import org.hibernate.Session; kE854Ej
import org.hibernate.criterion.DetachedCriteria; [sZ,nB/
import org.hibernate.criterion.Projections; 1s-=zs
import "Bl6)qw
=3|5=ZU034
org.springframework.orm.hibernate3.HibernateCallback; ?U3~rro!
import
]iry'eljy
e]@
B61lc
org.springframework.orm.hibernate3.support.HibernateDaoS >!PCEw<i
p%-;hL!
upport; wUKt$_]``
;8g[y"I
import com.javaeye.common.util.PaginationSupport; D-Q54 "^3
q.ZkQN+
public abstract class AbstractManager extends an)Z.x
1pM>-"a8j
HibernateDaoSupport { F7\nG}#s
7_`_iymR
privateboolean cacheQueries = false; C4K"eX,K
V-ONC
privateString queryCacheRegion; ;^ff35EE8
s&M#]8x;x
publicvoid setCacheQueries(boolean />O.U?
i QvqifDmh
cacheQueries){ M3s:B& /
this.cacheQueries = cacheQueries; ,U.|+i{
} 0}9
#Yx
/ubg6
publicvoid setQueryCacheRegion(String c/}-pZn<
nU/x,W[}
queryCacheRegion){ |?\2F
this.queryCacheRegion = UcWf
O!}D
^&\<[\
queryCacheRegion; m%U$37A1
} y4,t=Gq7^
GpXU&A'r
publicvoid save(finalObject entity){ zU";\);
getHibernateTemplate().save(entity); :nS p
} ~j[mM E}
~|&To>
publicvoid persist(finalObject entity){ ]uXmug
getHibernateTemplate().save(entity); @5{h+ ^
} D
4<,YBvV
9s#*~[E*
publicvoid update(finalObject entity){ Q&vU|y
getHibernateTemplate().update(entity); 6\RZ[gA?
} o$Z]qhq
O
+Xu?W]
publicvoid delete(finalObject entity){ |`O210B@
getHibernateTemplate().delete(entity); EO\- J-nM
} & sgzSX
H={5>;8G
publicObject load(finalClass entity, 0}-MWbG
qv8B$}F U
finalSerializable id){ LRPdA "Z
return getHibernateTemplate().load B6U4>ZN
Q#pgl
(entity, id); J :l%
} IYe ,VL
scyv]5Hm!
publicObject get(finalClass entity, !_?#f|
u(~( +1W
finalSerializable id){ !BR@"%hx
return getHibernateTemplate().get &"=<w
&?^"m\K4J*
(entity, id); LT:8/&\
} Fr hI[D
86W.z6
publicList findAll(finalClass entity){ }8Nr.gY
return getHibernateTemplate().find("from @+Anp4%;Y
@!B%ynrG
" + entity.getName()); h%] D[g
} 9n;6;K#
v
K!vA-7
publicList findByNamedQuery(finalString \xX'SB#.l
7o9[cq w
namedQuery){ m 3Do+!M[
return getHibernateTemplate ese?;1r
jBJ|%KM
().findByNamedQuery(namedQuery); MZ_dI"J,
} d[sY]_ dj
rGQY
publicList findByNamedQuery(finalString query, nxs'qX(D
CPJ%<+4%b
finalObject parameter){ jR"ACup(
return getHibernateTemplate r^`~GG!,Q
Z8o8>C\d9/
().findByNamedQuery(query, parameter); 8i^d*:R
} @UW*o&pGqL
4d%QJ7y
publicList findByNamedQuery(finalString query, U?j[
8z
c
Sktm&SP
finalObject[] parameters){ 5
&s<&h
return getHibernateTemplate +krDmU9(
[ N0"mE<
().findByNamedQuery(query, parameters); (4IH%Ez){
} )odz/\9n3c
|\N))K-2D
publicList find(finalString query){ ;&
zBNj
return getHibernateTemplate().find ?;DzWCL~9
R!2E`^{Wl
(query); vpoJ{TPO
} 14yzGhA
_aw49ag;
publicList find(finalString query, finalObject oI x!?,1
]>,Lw=_[_
parameter){ \8]("l}ms8
return getHibernateTemplate().find trlZ
Cg]S`R-
(query, parameter); d8VFa'|
} b\C1qM4
~/;shs<9EM
public PaginationSupport findPageByCriteria V(F1i%9l g
#./8inbG
(final DetachedCriteria detachedCriteria){ }M &hcw<
return findPageByCriteria
cfL:#IM
b#Vm;6BHD1
(detachedCriteria, PaginationSupport.PAGESIZE, 0); $Fv|w9
} uk)D2.eS,
a
t%qowt
public PaginationSupport findPageByCriteria h`:B8+k
c4M]q4]F
(final DetachedCriteria detachedCriteria, finalint kjj?X|Un
qKNHhXi
startIndex){ gk4DoO j#P
return findPageByCriteria .}3K9.hkr
z/|tsVK
(detachedCriteria, PaginationSupport.PAGESIZE, 43N=OFU
kV$VKag*A
startIndex); DhT8Kh{
} #<yKG \X?
jNW/Biy4u
public PaginationSupport findPageByCriteria TlJ'pG 4^
yOyuMZo6
(final DetachedCriteria detachedCriteria, finalint Y|aaZ|+
|],ocAN{
pageSize, H~?p,h
finalint startIndex){ eI+p
return(PaginationSupport) HQ^:5XH
o_PQ]1
getHibernateTemplate().execute(new HibernateCallback(){ B)s%B'
publicObject doInHibernate :{~TG]4M
i 8:^1rHp)
(Session session)throws HibernateException { A<{&?_U
Criteria criteria = p~dj-w
X,`e1nsR
detachedCriteria.getExecutableCriteria(session); )<_:%oB
int totalCount = wg|/-q-
WR}<^ax
((Integer) criteria.setProjection(Projections.rowCount E*8).'S%k
4?l:.\fB:
()).uniqueResult()).intValue(); ;% 4N@Z
criteria.setProjection c)zwyBz
Z)G@ahOQ
(null); 77;|PKE /
List items = E 7"`D\*
MzIn~[\
criteria.setFirstResult(startIndex).setMaxResults EN)0b,ax
{\ J%i|u
(pageSize).list(); JmbWEX|
PaginationSupport ps = =7-@&S=?s
hvF>Tu]^r
new PaginationSupport(items, totalCount, pageSize, dA$qzQ
_+.
)8
startIndex); AmBLZ<f;
return ps; "K#zY~>L
} F"t.ND
}, true); k4YW;6<C+
} -qJO6OM
a/U4pSug
public List findAllByCriteria(final {@>6E8)H5
SaA-Krn
DetachedCriteria detachedCriteria){ |\SwZTr
return(List) getHibernateTemplate lM[FT=M
}&LLo
().execute(new HibernateCallback(){ ^4{"h
publicObject doInHibernate myDcr|j-a
<@+{EK'`q
(Session session)throws HibernateException {
~ P!%i9e_
Criteria criteria = 8Xz \,}$O
|:5[`
detachedCriteria.getExecutableCriteria(session); r*t\F&D
return criteria.list(); rY]QTS">o
} r$&WwH2^
}, true); {S5j;
} ,\D*=5
h3P ^W(=&
public int getCountByCriteria(final C7_#D O6"
:PQvt/-'(D
DetachedCriteria detachedCriteria){ zl!Y(o!@
Integer count = (Integer) AR7]~+X
*hkNJ
getHibernateTemplate().execute(new HibernateCallback(){ a<v!5\dq!
publicObject doInHibernate Wh1'?#
iKEHwm
(Session session)throws HibernateException {
U].3vju`c
Criteria criteria = oPR?Ar
"j?\Ze*
detachedCriteria.getExecutableCriteria(session); 'SnB7Y
return p=]z`t
swG!O}29OX
criteria.setProjection(Projections.rowCount ]BY<D`$$P
;<nQl,2N
()).uniqueResult(); dR
>hb*kJ
} i3o;G"IcD
}, true); ,=`iQl3(y/
return count.intValue(); &9\8IR >
} U t.#h="
} 'Sjt*2blq
Y%@a~|
hbE~.[Y2r
3V@!}@y,F6
w*B4>FYg
utBKl'`
用户在web层构造查询条件detachedCriteria,和可选的 @;h$!w<
KU (g Zy
startIndex,调用业务bean的相应findByCriteria方法,返回一个 a_o99lP
CL<m+dW%*
PaginationSupport的实例ps。 xc_-1u4a9
lH%-#2]
ps.getItems()得到已分页好的结果集 OjfumZL#
ps.getIndexes()得到分页索引的数组
03a<Cd/S
ps.getTotalCount()得到总结果数 z*G(AcS)
ps.getStartIndex()当前分页索引 2t`d.s=
ps.getNextIndex()下一页索引 R![4|FR
ps.getPreviousIndex()上一页索引 >2dF^cDE-3
==Bxv:6
,_RPy2N
:x36Z4:
Yo[Pu< zR
P2sM3C
's 'H&sa
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 : 5<u!-}
4?.L+wL
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 yf2$HF
|J^$3RX
一下代码重构了。 s!WI:E7
|!"qz$8fB
我把原本我的做法也提供出来供大家讨论吧: @]X5g8h
$gysy!2}.
首先,为了实现分页查询,我封装了一个Page类: ]%Z7wF</
java代码: pX]"^f1?O
>0.a#-u^
?$ 0t @E
/*Created on 2005-4-14*/ 8 ;o*c6+
package org.flyware.util.page; l[M?"<Ot;
Gey j`t
/** sL\W6ej
* @author Joa fQ_(2+FM
* dIOiP\^
*/ n0tVAH'>
publicclass Page { d2(3 ,
)m.U"giG++
/** imply if the page has previous page */ x$=""?dd
privateboolean hasPrePage; pDM95.6
DE" Y(;S
/** imply if the page has next page */ gkL{]*9&%
privateboolean hasNextPage; 1cY,)Z%l #
`u#N
/** the number of every page */ +'!Y[7|9iv
privateint everyPage; c`xgz#]v
ZCz#B2Sf8
/** the total page number */ 22r$Ri_>
privateint totalPage; J~k'b2(p3
>j_N6B!
/** the number of current page */ 1 JB~G7
privateint currentPage; E 9v<VoNP`
GLr7sack
/** the begin index of the records by the current (V9 ;
g<PglRr"
query */ m+9~f_}
privateint beginIndex; s|d"2w6t
vmIt!x
x5%x""VEK
/** The default constructor */ G'f5MP1
public Page(){ ,@0D_&JAl
^@OdY&5^
} C] >?YR4
%#iu
/** construct the page by everyPage a/dq+
* @param everyPage se&Q\!&M
* */ )Rr0f 8
public Page(int everyPage){ p~f=0K
this.everyPage = everyPage; ^F:Bj&0v[
} `$i/f(t6`
XWv;l)
/** The whole constructor */ yNOoAnGT W
public Page(boolean hasPrePage, boolean hasNextPage, +S
],){
>m#bj^F\
Qkb=KS%z
int everyPage, int totalPage, 55Ag<\7
int currentPage, int beginIndex){ }b=Cv?Zg$m
this.hasPrePage = hasPrePage; eH^~r{{R
this.hasNextPage = hasNextPage; *m*sg64Zw
this.everyPage = everyPage; +wxDK A_
this.totalPage = totalPage; =gQ^,x0R9
this.currentPage = currentPage; olca
Z
this.beginIndex = beginIndex; !"<~n-$B
} @~8*
= ow=3Ku
/** e]-%P(}Z
* @return oUx%ra{
* Returns the beginIndex. 0Ait7`
*/ M*2
Nq=3
publicint getBeginIndex(){ (Fs{~4T
return beginIndex; J+r:7NvZ
} %3@-.=
tZan1C%p>
/** <BjrW]pM
* @param beginIndex lGpci
* The beginIndex to set. _kT{W]
*/ RJ OW#e :
publicvoid setBeginIndex(int beginIndex){ 5[Uv%A?H#_
this.beginIndex = beginIndex; v:?l C<,
} ]8CgHT[^7
1:22y:^j
/** xq<X:\O
* @return ,)ZI&BL5
* Returns the currentPage. r1/9BTPKdJ
*/ 2B"&WKk
publicint getCurrentPage(){ hO; XJyv
return currentPage; &gsBbQ+qA
} p> g[: ~
~|( eh9
/** FwUgMR*xq
* @param currentPage ,-[z?dvO
* The currentPage to set. D|$Fw5!^k6
*/ KZ@'NnQ
publicvoid setCurrentPage(int currentPage){ n}/4em?
this.currentPage = currentPage; M< /
} tn}MKo
.zv BV_I
/** 8p_6RvG
* @return 9J$-E4G.M
* Returns the everyPage. +
f,Kt9Cy
*/ kxmc2RH>nB
publicint getEveryPage(){ bX>R9i$
return everyPage; v?0F
} tmi)LRF
H
}CL7h;5N 3
/** tE,&
G-jU
* @param everyPage U=PTn(2
* The everyPage to set. 'OvM
*/ #mkf2Z=t-
publicvoid setEveryPage(int everyPage){ Q89fXi0Ivb
this.everyPage = everyPage; e,
fZ>EJ
} )Z)Gb~G
0o!mlaU#
/** %77uc9}
* @return 9BAvE\o0
* Returns the hasNextPage. /36gf
*/ aa"3
Io
publicboolean getHasNextPage(){ :IucH%6V
return hasNextPage; E+lr{~
} S%aup(wu6
DLuaM?7
/** dz!m8D0
* @param hasNextPage zl(o/n
* The hasNextPage to set. 5XV|*O;
*/ p6!5}dD(
publicvoid setHasNextPage(boolean hasNextPage){ t&