Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 zJy=1r
tWy.Gz\
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 2)\->$Q(H
xAd@.^
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 J/e]
Wx]Xa]-
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ]Pe>T&
:po6%}hn
。 ;:
_K,FU
=U*D.p*%f
分页支持类: i#b /.oa
a-|pSe*rx
java代码: rz_W]/G-P
*t| !xO
gC2}?nq*
package com.javaeye.common.util; 3E;@.jD
8Y`g$2SZ^8
import java.util.List; .kU^)H"l
$|g1 _;(G
publicclass PaginationSupport { ~)_Nh
lj}3TbM
publicfinalstaticint PAGESIZE = 30; y*^UGJC:
I{dy,\p
privateint pageSize = PAGESIZE; 3ArHaAv{y
.%n_{ab1
privateList items;
,==_u
v}u]tl$,
privateint totalCount; =>5Lp
^7+;XUyg
privateint[] indexes = newint[0]; fdKE1,;
+_fFRyu>
privateint startIndex = 0; #d,)Qe[
}~zDcj_
public PaginationSupport(List items, int )/'WboL
td7(444]
totalCount){ Vxap+<m
setPageSize(PAGESIZE); P
_fCb
setTotalCount(totalCount); w~v6=^
setItems(items); qzNb\y9G
setStartIndex(0); Jyg1z,B <
} ?SgFD4<~P
aXj
UDu7
public PaginationSupport(List items, int fB9,#
F
J'
uaZI>'
totalCount, int startIndex){ {Ia1H
setPageSize(PAGESIZE); <$-^^b(y
setTotalCount(totalCount); hT-^1:N
setItems(items); _Sd^/jGpU
setStartIndex(startIndex); ben-<3r
} |OCiq|#
f> Jj5he/
public PaginationSupport(List items, int Rs"=o>Qu
6agG*x
totalCount, int pageSize, int startIndex){ {rMf/ RAE
setPageSize(pageSize); 36OQHv;&
setTotalCount(totalCount); SeXgBbGAne
setItems(items); 9Zl4NV&B
setStartIndex(startIndex); ;6PU
} VI4mEq,V
95#]6*#[4!
publicList getItems(){ u=InE|SH
return items; ;&J>a8B$
} >xo<i8<Miv
1 jB0gNe
publicvoid setItems(List items){ dj(&"P
this.items = items; -(TC'
} .TA)|df
^
4dFr~ {
publicint getPageSize(){ 79>x/jZka
return pageSize; .Xp,|T
} ZPw4S2yw3.
c\o_U9=n
publicvoid setPageSize(int pageSize){ w~Q\:<x&~Z
this.pageSize = pageSize; Sc{&h8KMTb
} DDkN3\w
1(Vv-bq$
publicint getTotalCount(){ I= :yfW
return totalCount; wX)'1H):T
} zNo,PERG
@Ik5BT
publicvoid setTotalCount(int totalCount){ J&\Q3_vro9
if(totalCount > 0){ \wz^Z{U
this.totalCount = totalCount; IQ\!wWKmY
int count = totalCount / &_Cc
ib(|}7Je
pageSize; bgE]Wk0
if(totalCount % pageSize > 0) 0o$RvxJ
count++; 0(+<uo~6p1
indexes = newint[count]; m33&obSP
for(int i = 0; i < count; i++){ i5le0lM
indexes = pageSize * Awfd0L;9
=Ks&m4
i; UNb7WN
} T U_'1
}else{ 0cB]:*W
this.totalCount = 0; .?NfV%vv
} vT{(7m!Ra
} p9i7<X2&
no-";{c
publicint[] getIndexes(){ hb*Y-$Zp
return indexes; Cu%BU}(
}
5:gpynE|
2&S^\kf
publicvoid setIndexes(int[] indexes){ ~`e!$=
this.indexes = indexes; c}OveR$'&
} +$ djX=3
6,LE_ -G5
publicint getStartIndex(){ XixjdBFP
return startIndex; am/}V%^
} .a2R2~35
.&b^6$dC
publicvoid setStartIndex(int startIndex){ M/W9"N[ta
if(totalCount <= 0) Pn4.gabE
this.startIndex = 0; z@IG"D
elseif(startIndex >= totalCount) g5 *E\T%8
this.startIndex = indexes dY$nw
HkRvcX
5
[indexes.length - 1]; M)K!!Jqh
elseif(startIndex < 0) D#'CRJh;7
this.startIndex = 0; $9\8?gS
else{ FDuA5At
this.startIndex = indexes ][Tw^r&
{nSgiqd"28
[startIndex / pageSize]; Bkq4V$D_
} oNXYBeu+
} Iw[zN[oz
9-j-nx
@)
publicint getNextIndex(){ 0aR.ct%
int nextIndex = getStartIndex() + lv]U)p
.=}\yYGe
pageSize; {@Lun6\
if(nextIndex >= totalCount) +~F>:v?Rh
return getStartIndex(); #"A`:bjG
else 5);"()g32
return nextIndex; tpzWi
W/
} vRaxB
x!S}Y"
publicint getPreviousIndex(){ 2IHS)kkT|
int previousIndex = getStartIndex() - R7:u 8-dU1
F6CuY$0m=
pageSize; D`41\#ti
if(previousIndex < 0) aC9iNm8w
return0; *cFGDQ!
else P)y2'JKL
return previousIndex; ql.[Uq
} u7J:ipyiq2
8}[<3K%*g
} &VU^d3gv~
ok ,O/|E}?
}@$CS5w
>nehyo:#
抽象业务类 D{8B;+
java代码: Ro$*bN6p
#bGYHN
#r>)A
/** yAGQD[ih
* Created on 2005-7-12 =?Co<972Z
*/ Q!-"5PX
package com.javaeye.common.business; yWc%z6dXC
Pt-mLINvG
import java.io.Serializable; ~<IQe-Q5
import java.util.List; N>L)2WKFT
)=glN<*?
import org.hibernate.Criteria; ?:GrM!kq76
import org.hibernate.HibernateException; zBI2cB8;P
import org.hibernate.Session; R^@`]dX$
import org.hibernate.criterion.DetachedCriteria; &> .QDO
import org.hibernate.criterion.Projections; :O,,fJ<x.O
import uUBUUr
WM$Z?CN%KB
org.springframework.orm.hibernate3.HibernateCallback; H,;ZFg /v8
import n~>b}DY
-H\j-k
org.springframework.orm.hibernate3.support.HibernateDaoS 9nO&d(r g
^|U5@u_
upport; c-7Zk!LfD
`K$;K8! 1
import com.javaeye.common.util.PaginationSupport; 'Q7t5v@FF
4u2_xbT
public abstract class AbstractManager extends #EKnjh=Uq
e=jtF"&
HibernateDaoSupport { qoph#\
fk2Uxg=[
privateboolean cacheQueries = false; A&KY7[<AC{
9l&G2 o
privateString queryCacheRegion; |tY6+T}
ze+S_{
publicvoid setCacheQueries(boolean #\ ="^z6
lzFg(Ds!f
cacheQueries){ }]=A:*jD
this.cacheQueries = cacheQueries; V~.SgbLc
} \Ym$to
N1n\tA?
publicvoid setQueryCacheRegion(String 5M8
/f.
,xs!
queryCacheRegion){ f~jdN~
this.queryCacheRegion = s!Id55R]
3!?QQT,!)
queryCacheRegion; L^s?EqLXS
} RHu,t5,
z&qOu8Jh
publicvoid save(finalObject entity){ Ra~:O\Z
getHibernateTemplate().save(entity); ;%>X+/.y0
} x1CMW`F
4^6Oh#p0
publicvoid persist(finalObject entity){ >Zf*u;/dW$
getHibernateTemplate().save(entity); su-0G?c
} q{yzux
gs@^u#O
publicvoid update(finalObject entity){ z;0]T=g
getHibernateTemplate().update(entity); [ifQLsHA
} OWN|W,
%z
@T /
publicvoid delete(finalObject entity){ "VsS-b^ P
getHibernateTemplate().delete(entity); HqOnZ>D
} Oh}@c~7;
T(q Hi?Y
publicObject load(finalClass entity, (ke<^sv7!
b]8\%=d
finalSerializable id){ I= z+`o8
return getHibernateTemplate().load .lcgM
,*p(q/kJh~
(entity, id); !<-+}X+o8$
} x||b:2
lnxA/[`a
publicObject get(finalClass entity, Oo\~'I
giN(wPgYP
finalSerializable id){ )fT0FLl|1
return getHibernateTemplate().get q 7+ |U%!9
yg4ILL
(entity, id); P_@ty~u
} M?$tHA~OX
52
DSKL
publicList findAll(finalClass entity){ .9!&x0;
return getHibernateTemplate().find("from *EtC4sP
Gg7ZSB 7
" + entity.getName()); aUBu"P$J
} `\-MpNw
6z67%U*8r
publicList findByNamedQuery(finalString jm|zn
Rn whkb&&
namedQuery){ y+VRD
return getHibernateTemplate k#@)gL
%bnjK#o"Q
().findByNamedQuery(namedQuery); C2%Yr y
} JAL"On#c#0
Ly/5" &HD
publicList findByNamedQuery(finalString query, eR8>5:V_
K*MI8')
finalObject parameter){ z<<aT
return getHibernateTemplate fli7Ow?M~
lzZ=!dG
().findByNamedQuery(query, parameter); 5g4c1K
} jmnrpXaAx
jRdW=/q+(
publicList findByNamedQuery(finalString query, U09@pne8
RKz _GEH)
finalObject[] parameters){ yj`xOncE}
return getHibernateTemplate C_hIPMU=
DZ;2aH
().findByNamedQuery(query, parameters); v\COl*
} xm<sH!,j
uFi[50
publicList find(finalString query){ y\[GS2nTX
return getHibernateTemplate().find '8Lc}-M4
p WKpc
(query); QjUojHz%Z
} :&D$Q
4
Z@:R'u2Lk
publicList find(finalString query, finalObject }pPt- k
}Qvoms<k
parameter){ }4I;<%L3`
return getHibernateTemplate().find n!XSB7d~X
d e~3:
(query, parameter); :20k6 )
} A}n5dg0u
AwGDy +
public PaginationSupport findPageByCriteria TsZX'Yn
E@;v|Xc
(final DetachedCriteria detachedCriteria){ 1 ^=[k
return findPageByCriteria 4=n%<U`Z/
27jZ~Bp$
(detachedCriteria, PaginationSupport.PAGESIZE, 0); 0 :1ldU
4
} 12%4>2}~>
-
e"XEot~
public PaginationSupport findPageByCriteria 8 K>Ejr
,}42]%$G
(final DetachedCriteria detachedCriteria, finalint 9]/ju
r;aP`MVO<
startIndex){ _b 8XF&O
return findPageByCriteria Z$a4@W9o
z15QFVm
(detachedCriteria, PaginationSupport.PAGESIZE, O0<GFL$)&
ZZl4|
startIndex); q\5C-f
} h!>NS ?X7
5B=Wnau
public PaginationSupport findPageByCriteria 6MRS0{
A&fh0E (t
(final DetachedCriteria detachedCriteria, finalint c)o[3o7
]^\+B4
pageSize, $JXQn
finalint startIndex){ mJ5LRpXN
return(PaginationSupport) h?:Y\DlU'
pNzGpCk
getHibernateTemplate().execute(new HibernateCallback(){ gb0ZGnI
publicObject doInHibernate OECXNx
X{riI^(
(Session session)throws HibernateException { IyA8+N
y
Criteria criteria = 9Fh(tzz
*Cgd?*\7
detachedCriteria.getExecutableCriteria(session); *:A)j?(
int totalCount = `Lu\zR%<
KBFAV&
((Integer) criteria.setProjection(Projections.rowCount gBG.3\[
>(HUW^T/9z
()).uniqueResult()).intValue(); 9w FQ<r
criteria.setProjection KGX?\#-
U!x\oLP
(null); QcQ|,lA.HI
List items = ;EfMTI}6K
,/>~J]:\;
criteria.setFirstResult(startIndex).setMaxResults b511qc"i>M
57b;{kl
(pageSize).list(); VI`x
fmVOQ
PaginationSupport ps = way-Q7
X_eV<]zA+
new PaginationSupport(items, totalCount, pageSize, |"Oazll
MPd#C*c
startIndex); \:?H_^^d
return ps; G1'w50Yu
} a[8_O-
}, true); @]h#T4z'
} AH],>i3
*H
RxC
public List findAllByCriteria(final t hDE
1h
~dwl7Qc
DetachedCriteria detachedCriteria){ Q$9`QY*6"p
return(List) getHibernateTemplate b\\?aR
|
vu.f B4
().execute(new HibernateCallback(){ KXFa<^\o
publicObject doInHibernate !<2*B^
':w6{b
(Session session)throws HibernateException { 2h6F j&
Criteria criteria = hTn
}AsfLY
g `B?bBg
detachedCriteria.getExecutableCriteria(session); #zt+U^#)
return criteria.list(); vP'R7r2Yx
} 3-8Vw$u
}, true); {UYqRfgbZ
} uyG4zV\h*
{ersXQ:
public int getCountByCriteria(final e"|9%AW@<
J:mOg95<
DetachedCriteria detachedCriteria){ %/MK$
Integer count = (Integer) wL 5).`oq
s}9aZ
getHibernateTemplate().execute(new HibernateCallback(){ ;o3
.<"
publicObject doInHibernate ?t}[Wi}7
]yVB66l
(Session session)throws HibernateException { XW Y0WDh:
Criteria criteria = ^J~}KOH
7F'61}qL
detachedCriteria.getExecutableCriteria(session); 1^Zx-p3J
return <$njU=YE&
^?xXP=/
criteria.setProjection(Projections.rowCount ;|/7o@$n
3G8uXB_`}
()).uniqueResult(); ._tv$Gd@k
} `u-VGd\
}, true); J= |[G'
return count.intValue(); "rjJ"u1
} -RH ?FJ
} =C\S6bF%
ak;Z;
r$\g6m
~0 FqY&4
6^: l
[bT@Y:X@`
用户在web层构造查询条件detachedCriteria,和可选的 ?I/,r2ODLh
c@q>5fR/c
startIndex,调用业务bean的相应findByCriteria方法,返回一个 @,aL'2G
$~~=SOd0
PaginationSupport的实例ps。 3.d=1|E
d=4MqX r
ps.getItems()得到已分页好的结果集 d$2{_6
ps.getIndexes()得到分页索引的数组 "|Q&
ps.getTotalCount()得到总结果数 (%fGS.TR
ps.getStartIndex()当前分页索引 vP~F+z
@g
ps.getNextIndex()下一页索引 "
^eq5?L
ps.getPreviousIndex()上一页索引 Q#g
s)2
ci^-0l_O
4GHIRH
C%[
3P\I;xM
b]g.>$[nX
O:BP35z_F
[7s5Vt|
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ;Ok11wOw
?<LG(WY
,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'h
)(^
*<