Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 9->E$W
5M4mFC6
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根
#"&h'V
OM*N) *
据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 Y0:y72mK
7^P!@o$v!
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 $=uyZTYF)}
AmNmhcN
。 Adp:O"-H1o
Z;M]^?
分页支持类: F/sXr(7
O?/\hZ"&c
java代码: P*_!^2
2qLRcA=R
6*u#^">,<
package com.javaeye.common.util; o65:)z
u
;
>Tko<
import java.util.List; &@u;xc| v
TkXD#%nFY
publicclass PaginationSupport { Ymkk"y.w
-bJht
publicfinalstaticint PAGESIZE = 30; AD^9?Z
ES p)%
privateint pageSize = PAGESIZE; s1.YH?A;
":EfR`A#
privateList items; vY0C(jK
7t= e"|^
privateint totalCount; nQ2V
K-(k6<h
privateint[] indexes = newint[0]; h^h,4H\r
:=WiT_M
privateint startIndex = 0; k0~mK7k
:c3}J<Z
public PaginationSupport(List items, int H'|b$rP0@
]4wyuP,up
totalCount){ HTiqErD2_
setPageSize(PAGESIZE); c+chwU0W
setTotalCount(totalCount); ( P|Ph
setItems(items); f(~xdR))eh
setStartIndex(0); #
le<R
} !N:!x[5
g]?&qF}
public PaginationSupport(List items, int #s'9Ydd
7WK^eW"y8
totalCount, int startIndex){ nTxeV%
setPageSize(PAGESIZE); Mqc"
setTotalCount(totalCount); ={,\6a|]:
setItems(items); PhL }V|W>
setStartIndex(startIndex); SRs1t6&y=
} Y-\/Y*;cd
6'
}oo'#~
public PaginationSupport(List items, int D#|+PG7
$/^DY&
totalCount, int pageSize, int startIndex){ ~?i;~S
setPageSize(pageSize); 7pH`"$
setTotalCount(totalCount); (8DJf"}
setItems(items); FG]xn(E
setStartIndex(startIndex); `t_S uZ`V
} zvv<w@rX
jf25Ky~
publicList getItems(){ ]G.ttfC
return items; :ad
} +k|t[N
JW[y
publicvoid setItems(List items){ 5ZeE& vG2
this.items = items; m?cC 0(6
} c ;_ T
C-!!1-Eq?:
publicint getPageSize(){ J60XUxf
return pageSize; 5u
+U^D
} 'q%56WAJ
pleLdGq
publicvoid setPageSize(int pageSize){ xL8r'gV@
this.pageSize = pageSize; 6[fp e
} xG:eS:iT
l_bvwo
publicint getTotalCount(){ h8@8Qw
return totalCount; 2Zt :]be
} e~]3/ 0
Za68V/Vj
publicvoid setTotalCount(int totalCount){ y'\BpP
if(totalCount > 0){ wBz?OnD/D
this.totalCount = totalCount; +-tvNX%IJ
int count = totalCount / .^6;_s>FN
a+A^njk
pageSize; +oa\'.~?
if(totalCount % pageSize > 0) ,#&\1Vxf
count++; KwGk8$ U
indexes = newint[count]; gB/4ro8
for(int i = 0; i < count; i++){ f P'qUN
indexes = pageSize * 7u[U %yd
cQ(zBf
i; &)jBr^x#>
} 4q sIJJ[.
}else{ sf{rs*bgp
this.totalCount = 0; NA%M)u{|
} H",w$$eF
} Zzy!D
`-a](0QU
publicint[] getIndexes(){ 2d:<P!B
return indexes; B-Bgk
} ]D(!ua5|x`
\Tq !(]o^
publicvoid setIndexes(int[] indexes){ ~aKM+KmtPH
this.indexes = indexes; GJ YXCi
} hBb&-/
wdS4iQD
publicint getStartIndex(){ b=nQi./f
return startIndex; =`RogjbP
} g<C_3ap/
{Up@\M
publicvoid setStartIndex(int startIndex){ TZ#(G
if(totalCount <= 0) <T] BSQk
this.startIndex = 0; ZlaU+Y(_[
elseif(startIndex >= totalCount) 7ux0|l
this.startIndex = indexes {OFbU
cp D=9k!*K
[indexes.length - 1]; 0($@9k4!/
elseif(startIndex < 0) \@G
7Kk*l
this.startIndex = 0; X!=E1TL
else{ )P&>Tc?;z
this.startIndex = indexes @J J,$?
hcWYz
[startIndex / pageSize]; #4hxbRN
} tA#7Xr+
} 5f5bhBZ<
,/{(8hn
publicint getNextIndex(){ /S4$qr cM
int nextIndex = getStartIndex() + j1/.3\
u,h ,;'J
pageSize; Ns?qLSN
if(nextIndex >= totalCount) Xvy3D@o
return getStartIndex(); mOiA}BGw
else Rb!|2h)
return nextIndex; 5]C}044
} T NwBnMe
_H[LUl9
publicint getPreviousIndex(){ ,3 !D(&
int previousIndex = getStartIndex() - )6K Q"*
p)_v.D3i
pageSize; J\7ukm"9
if(previousIndex < 0) tG!ApL
return0; Qsv3`c
else %N((p[\H
return previousIndex; O>8|Lc
} LOm*=MVex
]J<2a`IK!
} ZR|)+W;
q. zBm@:
TVaD',5_V%
LJ^n6 m|_
抽象业务类 kjCXP
java代码: B 4s^X`?z
#jY\l&E
9 Vn
/** ZUDdLJ
* Created on 2005-7-12 Vz=ByyC
*/ 82w;}(!
package com.javaeye.common.business; lr>:S
_hM
#*?}v
import java.io.Serializable; wUUDq?!k\
import java.util.List; $bf&ct*$h
)C?bb$
G
import org.hibernate.Criteria; $e(]L(o;
import org.hibernate.HibernateException; jg2UX
import org.hibernate.Session; cvoE4&m!
import org.hibernate.criterion.DetachedCriteria; T6T3:DG_B
import org.hibernate.criterion.Projections; px|y_.DB2x
import PKDzIA~T
x#wkODLqi
org.springframework.orm.hibernate3.HibernateCallback; m8Wv46%
import ~|W0+ &):
$!~R'N c
org.springframework.orm.hibernate3.support.HibernateDaoS
$f++n5I
j=raS
upport; kzMul<>sl
Yd}Jz
import com.javaeye.common.util.PaginationSupport; Y}db<Cz
X
5|T[:m
public abstract class AbstractManager extends RQaB_bg7
pKSn
3-A
HibernateDaoSupport { to}g4
Dt1v`T~=?
privateboolean cacheQueries = false; ,'FH[2
i5f8}`w
privateString queryCacheRegion; ,r$k79TI
9\yGv
publicvoid setCacheQueries(boolean "c0I2wq
X@ zw;Se
cacheQueries){ yH\3*#+
this.cacheQueries = cacheQueries; GM1z@i\5
} }}R?pU_
IJWUNKqo=
publicvoid setQueryCacheRegion(String &sFEe<
li!3bv
queryCacheRegion){ x,CTB
this.queryCacheRegion = 79DzrLu
S5Hb9m&&
queryCacheRegion; }rWEa^
} =H<I` J'
*=sMJY9#jE
publicvoid save(finalObject entity){ x,U'!F
getHibernateTemplate().save(entity); 0_!')+
} (d>
M/x?W
cRR[ci34k
publicvoid persist(finalObject entity){ we4k VAn
getHibernateTemplate().save(entity); !ucHLo3:
} `"7}'|
7P+qPcRaP
publicvoid update(finalObject entity){ Dd: TFZo
getHibernateTemplate().update(entity); h/)kd3$*'
} *3uBS2Ld
>
whcZ.8
publicvoid delete(finalObject entity){ -qI8zs$:5
getHibernateTemplate().delete(entity); 4AIo,{(
} 5%qq#;[n
{D6p?TL+
publicObject load(finalClass entity, 9.:]eL
&dH[lB
finalSerializable id){ 5Kadh2nz
return getHibernateTemplate().load & bKl(,
R6(sWN-
(entity, id); \
F\ /<
} e_<'zH_1
W2$MH: j
publicObject get(finalClass entity, O c[F
(6y[,lYH
finalSerializable id){ j_(DH2D
return getHibernateTemplate().get &["s/!O1 R
}?\8%hK"a7
(entity, id); t!=qt*
} <Ny DrO"C3
GiZv0>*x
publicList findAll(finalClass entity){ Mr0<b?I
return getHibernateTemplate().find("from <W>T!;4!
8vp*U
" + entity.getName()); |w{}h6a
} 2bs={p$}a
3jI
rB%
publicList findByNamedQuery(finalString >3C4S
Q.U
wtH
namedQuery){ '3p7ee&
return getHibernateTemplate Jw4#u5$$Z
^vj}
().findByNamedQuery(namedQuery); s~z~9#G(6
} }&*wJ]j`L
& t.G4
publicList findByNamedQuery(finalString query, 5[[mS
]ZMFK>"^%
finalObject parameter){ RXi/&'+H
return getHibernateTemplate )Ja&Y
=O1py_m
().findByNamedQuery(query, parameter); W0I)< S
} PM?F;mj
bQvhBa?
publicList findByNamedQuery(finalString query, D<QE?:#
<dD)>Y.
finalObject[] parameters){ r6b;v2!8
return getHibernateTemplate cXd?48O
ee}HQ.}Ja
().findByNamedQuery(query, parameters); ? PI2X.6
} /q^\g4J
2Y7u M;8
publicList find(finalString query){ n9 %&HDl4
return getHibernateTemplate().find b2tUJ2p
ppP0W`p
(query); R<L<kChg
} x 8/I"!gI
LmZ"_
publicList find(finalString query, finalObject Y'{F^VxA/
W"v"mjYud
parameter){ z@8W
return getHibernateTemplate().find /$U<S"
W=S<DtG2
(query, parameter); +F4SU(T
} xU!eT'Y
[0?W>A*h
public PaginationSupport findPageByCriteria lVYrP|#
tR Cz[M&
(final DetachedCriteria detachedCriteria){ TPF5 ?
return findPageByCriteria @}<b42
S]x\Asj;w
(detachedCriteria, PaginationSupport.PAGESIZE, 0); `3e>JIl"0
} !qe:M]C'l
]zATdfa
public PaginationSupport findPageByCriteria V{{Xz:
Bnfp_SM
(final DetachedCriteria detachedCriteria, finalint g}OZ!mKd
1!=^mu8
startIndex){ 6bwzNY 7
return findPageByCriteria Bln($lOz
v,d
bto0
(detachedCriteria, PaginationSupport.PAGESIZE, @OGHS}-\
N\t( rp
startIndex); !de`K
|
} 3JFX~"rV9I
XCd[<\l
public PaginationSupport findPageByCriteria
TY`t3
E;bv;RUio
(final DetachedCriteria detachedCriteria, finalint u Wxl\+_i
=v{Vl5&>?
pageSize, ,<t)aZL,A;
finalint startIndex){ Tl!}Rw~Pg
return(PaginationSupport) o JX4+uJ
UGP,/[XI
getHibernateTemplate().execute(new HibernateCallback(){ aCF=Og
publicObject doInHibernate _]t^F9l
wZ%a:Z4TcM
(Session session)throws HibernateException { #oD; ?Mi
Criteria criteria = $4:Se#nl
He)!Ez\X
detachedCriteria.getExecutableCriteria(session); _Q9I
W
int totalCount = z=6zc-$y 9
!T"jvDYH
((Integer) criteria.setProjection(Projections.rowCount {fI"p;|
H(gETRh
()).uniqueResult()).intValue(); ae>B0#=
criteria.setProjection IBz)3gj J
z(n Ba]^[F
(null); e|d~&Bk0
List items = UBWUq
\ RS
,Y
criteria.setFirstResult(startIndex).setMaxResults t`")Re_j
cd(YH! 3
(pageSize).list(); dqgH"g
PaginationSupport ps = ;J,`v5z0:
7V2xg h!W
new PaginationSupport(items, totalCount, pageSize, O?$]/d
?Q~o<%U7
startIndex); IAi|4,y_L
return ps; /@?lV!QiO
} [.'9Sw
}, true); J3XrlSc
} Tn"^`\m
uE,g|51H/
public List findAllByCriteria(final |c[= V?AC
)?{jD
DetachedCriteria detachedCriteria){ `hf`lq^
return(List) getHibernateTemplate (>SucUU
O?t49=uB}
().execute(new HibernateCallback(){ 9/JBn
publicObject doInHibernate Wi@YJ
Vr:`?V9Q2(
(Session session)throws HibernateException { C@3UsD\s(
Criteria criteria = mRIBE9K+&
;;K
~
detachedCriteria.getExecutableCriteria(session); 4+J>/ xiZ
return criteria.list(); qH(HcsgD
} dC>(UDC
}, true); ,Bs/.htQj
} )I"I[jDw
tu' s]3RE
public int getCountByCriteria(final abw5Gz@Ag
T|-llhJ8
DetachedCriteria detachedCriteria){ )fl+3!tq
Integer count = (Integer) PJPKn0,W
}`y%*--
getHibernateTemplate().execute(new HibernateCallback(){ ]Q#k"Je
publicObject doInHibernate gKP=@v%-
8GeJ%^0o}
(Session session)throws HibernateException { FE dFGT
Criteria criteria = @rS(3wu_&
9v/=o`J#
detachedCriteria.getExecutableCriteria(session); )|6OPR@(#/
return dVSQG947i:
b(\Mi_J
criteria.setProjection(Projections.rowCount `R*SHy!
_
"fC>]iA8I
()).uniqueResult(); I2WWhsNC
} 1<Vke$
}, true); q1Ad"rm
return count.intValue(); On0,#i=
} <;*w97n
} u6 Yp,!+
TN/y4(j
pM9M8d
m=25HH7enb
^% L;FGaA
hi/Z>1ZOX
用户在web层构造查询条件detachedCriteria,和可选的
(aLjW=
n&2OfBJ
startIndex,调用业务bean的相应findByCriteria方法,返回一个 W5/|.}
7Vuf4Z5
PaginationSupport的实例ps。 ~gaWZQXyu
iB5q"hoZC
ps.getItems()得到已分页好的结果集 KQ^|prN?y
ps.getIndexes()得到分页索引的数组 .hJcK/m
ps.getTotalCount()得到总结果数 ]&s@5<S[
ps.getStartIndex()当前分页索引 Sx1|Oq]
ps.getNextIndex()下一页索引 [ldBI3
ps.getPreviousIndex()上一页索引 "m`}J*s"
X\kWJQ:
2BiFP||
(+SL1O P
:j? MEeu
6xFchdMG{m
[?bq4u`
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 U6.hH%\}@
v'm-A d+4t
,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 yxi&80$
%, S{9q
一下代码重构了。 o]WcODJdl
t'Zv)Wu1E
我把原本我的做法也提供出来供大家讨论吧: ]Upr<!
vl~HV8MAv
首先,为了实现分页查询,我封装了一个Page类: UW1i%u
k
java代码: 51-'*Y
}0sLeGJ!
5"ooam3
/*Created on 2005-4-14*/ ..5.":
package org.flyware.util.page; RXw1HRR$V
1bjz :^
/** CF:L#r
* @author Joa S f6%A
* z<%dWz
*/ "ruYMSpU
publicclass Page { -d-xsP}
s
Q.fUpa v
/** imply if the page has previous page */ Q5A,9ovNZ
privateboolean hasPrePage; G'`^U}9V\
"gFw:t"VV
/** imply if the page has next page */ uAs!5h
privateboolean hasNextPage; `KZu/r-M9
K'B*D*w
/** the number of every page */ zN9#qlfv
privateint everyPage; ^Vi{._r
gjx-tp 1.
/** the total page number */ qMoo#UX
privateint totalPage; -3 Sb%V\
]$#9B-uB
/** the number of current page */ L={\U3 __k
privateint currentPage; wR,}#m,
' 6)Yf}I
/** the begin index of the records by the current O{\%{XrW
W>qu~ak?x
query */ j3H_g^
privateint beginIndex; z]KJ4
X"9N<)C
~dzD7lG6
/** The default constructor */ ]~~G<Yh:=
public Page(){ g W_E
t/_\w"
} +Jm vB6s
JTObyAoW
/** construct the page by everyPage y}is=h3
* @param everyPage u8t|!pMF8
* */ Mp=T;Nz
public Page(int everyPage){ |!/+T^u
this.everyPage = everyPage; ^cE {Uv
} l`uMtv/Wp
yo(MJ^=d
/** The whole constructor */ X|&H2y|*7
public Page(boolean hasPrePage, boolean hasNextPage, YWJ$Pp
ZpMv16
@eutp`xoT\
int everyPage, int totalPage, 22;B:
int currentPage, int beginIndex){ +o'xyR'(
this.hasPrePage = hasPrePage; fwmXIpteK
this.hasNextPage = hasNextPage; o5sw]R5
this.everyPage = everyPage; uF1&m5^W
this.totalPage = totalPage; ^vTx%F
this.currentPage = currentPage; mkfDDl2 GP
this.beginIndex = beginIndex; FS=LpvOG)
} 1k^$:'
Mlr'h}:H
/** j9yOkaVEg
* @return |i~-,:/-Y
* Returns the beginIndex. LwTdmR
*/ /n6ZN4
publicint getBeginIndex(){ oRJ!TAbD
return beginIndex; $|7=$~y
} X|/RV4x@Cq
Ptcq/f
/** f mJK+
* @param beginIndex w^=(:`
* The beginIndex to set. 54B`T/>R:E
*/ ZJ~0o2xZ'
publicvoid setBeginIndex(int beginIndex){ .z=%3p8+
this.beginIndex = beginIndex; u c}tTmB|
} gs7_Q
Om;aE1sW
/** )_OGt [_H
* @return 5UOqS#"0
* Returns the currentPage. G Y.iCub
*/ &