Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 'Bwv-J
-oT3`d3
detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 2C AR2V|
.$ X|96~$
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 WRp0.
dUH+7.\
自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 Yy'CBIq#f
=`ECM7
。 |@BX*r
rcz9\@M
分页支持类: vMzBp#MT
slQEAqG)B
java代码: UuCRQN H
-sxu7I
^Rb*mI
package com.javaeye.common.util; >0JCu^9
/RI"a^&9A
import java.util.List; Al+}4{Q+?
ZkryoIQ%=
publicclass PaginationSupport { :[&QoEZW
]oLyvG
publicfinalstaticint PAGESIZE = 30; a"D'QqtH
2j&0U!DX
privateint pageSize = PAGESIZE; M.67[Qj~"u
wpg7xx!
privateList items; O t{~mMDp
}`y%*--
privateint totalCount; <DN7
gKP=@v%-
privateint[] indexes = newint[0]; 8GeJ%^0o}
gu"@*,hL
privateint startIndex = 0; yRR[M@Y
9v/=o`J#
public PaginationSupport(List items, int 'fYF1gR4
p"0Dl9
totalCount){ P~;1adi3
setPageSize(PAGESIZE); "hnvND4=
setTotalCount(totalCount); /\MkH\zg
setItems(items); 8?1MnjhX10
setStartIndex(0); 6^)eW+
} 1<Vke$
q1Ad"rm
public PaginationSupport(List items, int 2(f-0or(
z@?WhD
totalCount, int startIndex){ *).!
setPageSize(PAGESIZE); P1^O0)
setTotalCount(totalCount); ]wwN mmE
setItems(items); XEBj=5sG
setStartIndex(startIndex); ar_@"+tZ
} jLn|zK
DWS#q|j`"
public PaginationSupport(List items, int YjiMUi\V
2U3e!V
totalCount, int pageSize, int startIndex){ eV"s5X[$
setPageSize(pageSize); yO`
|X
setTotalCount(totalCount); >T)tAZ?WK
setItems(items); s Fx0
setStartIndex(startIndex); 9)>+r6t
} (7ujJ}#,
2(5/#$t
publicList getItems(){ Sx1|Oq]
return items; [ldBI3
} QO:Z8{21So
[X7gP4
publicvoid setItems(List items){ 1p8pH$j'
this.items = items; S9[Y1qH>K
} 1amEQ
~UHjc0
publicint getPageSize(){ = |E8z
u%
return pageSize; \,#;gS"
} ;Sfe.ky@6
BIEq(/-
publicvoid setPageSize(int pageSize){ h; 6G~D
this.pageSize = pageSize; fw5+eTQ^
} PQUJUs
mkq246<D~
publicint getTotalCount(){ mWUd-| Ul
return totalCount; h]vEXWpG ]
} J%lrXm(l{
^r,0aNzAs
publicvoid setTotalCount(int totalCount){ }0sLeGJ!
if(totalCount > 0){ 5"ooam3
this.totalCount = totalCount; i-9W8A
int count = totalCount / jX0^1d@
<fE^S
pageSize; R@#xPv4o%
if(totalCount % pageSize > 0) eVd:C8q
count++; G#ELQ/Q
indexes = newint[count]; _St":9'uU
for(int i = 0; i < count; i++){ kek/C`7
indexes = pageSize * S$gLL kD1
=!)x`1j!S
i; ?dXAHY
} .[+}nA,g%~
}else{ UCj:]!P
this.totalCount = 0; _GM?`
} ui-]%~
} ^CgN>-xZ?#
ttls.~DG
publicint[] getIndexes(){ wp83E,
return indexes; i(;.Y
} 6uTC2ka[&R
U2LD_-HZ
publicvoid setIndexes(int[] indexes){ rGrR;
this.indexes = indexes; V`9*_8Dx2
} fhyoSRLR:
FzykC
publicint getStartIndex(){ RI+Y+z
return startIndex; .IM]B4m
} @6Lp$w
W)'*Dcd
publicvoid setStartIndex(int startIndex){ ]~~G<Yh:=
if(totalCount <= 0) g W_E
this.startIndex = 0; t/_\w"
elseif(startIndex >= totalCount) =[zP
this.startIndex = indexes = l:k($%%
maa$kg8U*!
[indexes.length - 1]; @t0T+T3
elseif(startIndex < 0) |Qcj+HH.
this.startIndex = 0; UFLx'VXd
else{ `PUxR8y
this.startIndex = indexes HCCq9us
/ !y~Q|<|=
[startIndex / pageSize]; ~2nt33"
} SurreD<x
} )a5ON8?
y4r?M8]"r
publicint getNextIndex(){ K#'$_0.
int nextIndex = getStartIndex() + ^IyYck'y+
Jd?qvE>Pp
pageSize; 59p'U /|
if(nextIndex >= totalCount) IG7,-3
return getStartIndex(); +SE \c
else @.c[z D
return nextIndex; ^vTx%F
} mkfDDl2 GP
[qxU
\OSC
publicint getPreviousIndex(){ Vf.*!`UH
int previousIndex = getStartIndex() - F=a
A,xPA
pageSize; 5%4yUd#b
if(previousIndex < 0) ng~LCffpY
return0; Z"qJil}
else ^)GaVL^"5
return previousIndex; on"ENT
} C<(qk _
KJv%t_4'F
} !@wUARQ
cK2;)&U7
}p-/R'
:>Bk^"
抽象业务类 ZJ~0o2xZ'
java代码: .z=%3p8+
!
2knSS
KhP_U{)D
/** U&{w:P
* Created on 2005-7-12 h_\(
$"
*/ wt;`_}g
package com.javaeye.common.business; p Q!lY
N=7iQ@{1
import java.io.Serializable; ]N;nq
import java.util.List; mq:WBSsV
+IWf~|s
import org.hibernate.Criteria; K:kb&W
import org.hibernate.HibernateException; dG8mE&$g
import org.hibernate.Session; c5uC?b].
import org.hibernate.criterion.DetachedCriteria; *4LRdLMn
import org.hibernate.criterion.Projections; O*bzp-6\
import Z{:;LC
RZKx!X4=q
org.springframework.orm.hibernate3.HibernateCallback; Z_edNf}|
import D(TG)X?
9+$IulOvk
org.springframework.orm.hibernate3.support.HibernateDaoS m @lUJY
%#PWD7a\
upport; >,tJq%
PkZ1Db
import com.javaeye.common.util.PaginationSupport; U$y wO4.
T8)X?>CIW
public abstract class AbstractManager extends 3$Vx8:Rhdn
-QR]BD%J*[
HibernateDaoSupport { Qx3eEt@X5]
`IJ)'$pn
privateboolean cacheQueries = false; /OB) \{-
Iz83T9I&
privateString queryCacheRegion; Q`6hJgyL
$tXW/
publicvoid setCacheQueries(boolean N$v_z>6Z
_L` uCjA
cacheQueries){ >mp Nn
this.cacheQueries = cacheQueries; m+:JNgX6
} "EA =auN{
nqx0#_K-E
publicvoid setQueryCacheRegion(String 63_#*6Pv28
jUl_ToX
queryCacheRegion){ 5''k|B>
this.queryCacheRegion = cH$(*k9%M
wq,&0P-v
queryCacheRegion; 7cWeB5e?O
} sZxTsUW
e=p_qhBt
publicvoid save(finalObject entity){ Vgkj4EE
getHibernateTemplate().save(entity); Q4*{+$A
} B2*>7 kc_s
GVu[X?q@|
publicvoid persist(finalObject entity){ p:$kX9mT&
getHibernateTemplate().save(entity); s-(c-E09
} /ueOc<[8"
(UhJ Pco"
publicvoid update(finalObject entity){ }EHL
}Q
getHibernateTemplate().update(entity); BzH0"xq^
} _TmKn!Jw
E(_k#X
publicvoid delete(finalObject entity){ Rq e|7/As
getHibernateTemplate().delete(entity); @%*@Rar
} zBwqIJfM
u|.|dv'mbp
publicObject load(finalClass entity, ,)!%^~v
ntB#2S
finalSerializable id){ ;@Z1y
return getHibernateTemplate().load lj8ficANo
W"pHR sf
(entity, id);
W/u(9
} R
>SZE"
T-GvPl9ZJw
publicObject get(finalClass entity, cTn(Tv9s
b{)kup
finalSerializable id){ qmGHuQVe
return getHibernateTemplate().get 6I=xjgwvf
. XbDb
(entity, id); JY"J}
} R/fE@d2~In
6vxRam6[??
publicList findAll(finalClass entity){ ]Ol
w6W?%
return getHibernateTemplate().find("from tJQZRZViu
jk_yrbLc
" + entity.getName()); [`E_/95
} [McH l1a
?/5<}W#7}
publicList findByNamedQuery(finalString J}4RJ9
&'i>d&
namedQuery){ sa/9r9hc+
return getHibernateTemplate 1M?x,N_W
PY4a3dp
U
().findByNamedQuery(namedQuery); {iq^CHAVK
} 1:M'|uc
xaB#GdD
publicList findByNamedQuery(finalString query, 7mv([}Va
}?Pa(0=U
finalObject parameter){ 7h!nt=8Y
return getHibernateTemplate EbVC4uY
Er8F_,M+
().findByNamedQuery(query, parameter); uh#E^~5S
} a #s
Nd
[;
$:Lr
publicList findByNamedQuery(finalString query, Mh3L(z]/E
|HJ`uGN<b
finalObject[] parameters){ `*yOc6i]
return getHibernateTemplate >b#CR/^z
X}h}3+V
().findByNamedQuery(query, parameters); qC& xuu|
} 4DP<)KX
Uvi@HB HJ
publicList find(finalString query){ 1|G5 W:
return getHibernateTemplate().find p14$XV
l
ObY
(query); H15!QxD#
} N!v>2"x8q
[AD%8H
publicList find(finalString query, finalObject ts@e
,
W$l4@A
parameter){ DIvxut
return getHibernateTemplate().find ?vF8 y;Jh
(r'NB
(query, parameter); )PkGT~3I
} &Q\k`0vzVB
-)bu&
public PaginationSupport findPageByCriteria (5y*Btd=
"
;8kKR
(final DetachedCriteria detachedCriteria){ =KnHa.%
return findPageByCriteria i*09m^r
QZO<'q`L
(detachedCriteria, PaginationSupport.PAGESIZE, 0); +:c}LCI9<
} yd45y}uS;F
U}=H1f,
public PaginationSupport findPageByCriteria v] Xy^7?
n4"xVDL
(final DetachedCriteria detachedCriteria, finalint h4ghMBo%
AI9=?X<kh
startIndex){ -A:'D8o#f
return findPageByCriteria rXe+#`m2
ashVV~\8A
(detachedCriteria, PaginationSupport.PAGESIZE, A9[D.W9>
w#bdb;
startIndex); cyL|.2,
} oK"#*n
T0\[":
A
public PaginationSupport findPageByCriteria #\z"k<{*
[E}pU8.t6
(final DetachedCriteria detachedCriteria, finalint Nk F2'Z{$+
RcI0n"Gi_
pageSize, %V!!S#W
finalint startIndex){ :O;uP_r9
return(PaginationSupport) j{/wG::
=_2(S 6~
getHibernateTemplate().execute(new HibernateCallback(){ N$Tzxs
publicObject doInHibernate gJ$m'kC;
H
a`V"X{}
(Session session)throws HibernateException { Z$)jPDSr
Criteria criteria = B|;?#okx
9!D
c=
detachedCriteria.getExecutableCriteria(session); :{Iv
]d
int totalCount = A2fuNV_
C$v
!emu
((Integer) criteria.setProjection(Projections.rowCount o 7 &q
f_QZql
()).uniqueResult()).intValue(); f{]W*!VV-
criteria.setProjection GMob&0l8_
)f%Q7
(null); S8]YS@@D
List items = 5*$z4O:Aa
[{+ZQd
criteria.setFirstResult(startIndex).setMaxResults #Z_f/@b
lstnxi%x
(pageSize).list(); >LEp EMJ\
PaginationSupport ps = S?~/
V ]
7{f{SIB
new PaginationSupport(items, totalCount, pageSize, (*!4O>]
qKuHd~M{ 1
startIndex); t@`Sa<
return ps; ;AarpUw'
} @=l.J+lh
}, true); \3j4=K'nE
} l-[5Zl;"
0Jm)2@
public List findAllByCriteria(final "LVN:|!
+n<;);h
DetachedCriteria detachedCriteria){ 45Q#6BtE
return(List) getHibernateTemplate 2|8$@*-\
kjR-p=}
().execute(new HibernateCallback(){ hB]<li)"C
publicObject doInHibernate Ng1[y4R}
X.ZY1vO
(Session session)throws HibernateException { Z3A"GWY
Criteria criteria = -/6Ms%O
5|oi*b
detachedCriteria.getExecutableCriteria(session); B]cV|S|
return criteria.list(); ]-u>HO g\
} ]i'gU(+;`
}, true); I%ZSh]On
} M 0RVEhX
B+=Xb;p8
public int getCountByCriteria(final \YF'qWB
fu`|@S
DetachedCriteria detachedCriteria){ brt`oR
Integer count = (Integer) ebB8.(k9G3
0J9Ub
getHibernateTemplate().execute(new HibernateCallback(){ YoRD9M~iG~
publicObject doInHibernate G/}nwj\
K6oQx)|
(Session session)throws HibernateException { A)o%\j
Criteria criteria = f<2<8xS
G%fNGQwT
detachedCriteria.getExecutableCriteria(session); Kdb:Q0B
return ^g N?Io
s!K9-qZl<
criteria.setProjection(Projections.rowCount 0Y ld!L
(k5d.E]CK
()).uniqueResult(); 3VmF1w
2
} 1?ST*b
}, true); DUu~s,A
return count.intValue(); I~U;M+n*y
} 14rX:z
} [c#?@S_
5!^?H"#c
(W$>!1~
TInp6w+u
Wwo`R5
uF\f>E)/N%
用户在web层构造查询条件detachedCriteria,和可选的 l#%G~c8x
*Y9' tHI
startIndex,调用业务bean的相应findByCriteria方法,返回一个 MG0d&[
^o6&|q
PaginationSupport的实例ps。 jD'$nKpg
W q>qso
ps.getItems()得到已分页好的结果集 -VRKQNT
ps.getIndexes()得到分页索引的数组 $t42?Z=N&z
ps.getTotalCount()得到总结果数 eop7=!`-~~
ps.getStartIndex()当前分页索引 C2Af$7c
ps.getNextIndex()下一页索引 cP (is!
ps.getPreviousIndex()上一页索引 tY$4k26
}h_=
n>
'9q:gFO
|th"ET
's6hCs&|NV
23[X mBf
^Dw18gqr=@
连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 1c03<(FCd
7e`h,e=
,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ;CdxKr-d
M/a5o|>8
一下代码重构了。 3D"?|rd~
Fo[=Dh*AqU
我把原本我的做法也提供出来供大家讨论吧: !3Me
6&$O
8qQrJFm|3*
首先,为了实现分页查询,我封装了一个Page类: +%RB&:K7,
java代码: q| 7$@H^*
]k.'~Syz
QDJ:LJz\
/*Created on 2005-4-14*/ w`r)B`!g
package org.flyware.util.page; 1 :d,8
:s'hXo
/** H;rLU9b
* @author Joa 5X"WgR;
* 23WlUM
*/ b&Go'C{p
publicclass Page { (J/!9NS:
9$:+5f,%a
/** imply if the page has previous page */ F
{T\UX
privateboolean hasPrePage; Gf1O7L1rX
DFFB:<
/** imply if the page has next page */ b_j8g{/9
privateboolean hasNextPage; t+Rt*yjO
dsUY[X-<6
/** the number of every page */ $>y
privateint everyPage;
-z$&lP]
@Tg +Kt
/** the total page number */ eMV@er|
privateint totalPage; ck4g=QpD{
tM;S
)S(=
/** the number of current page */ P _3U4J
privateint currentPage; G`r*)pdm
[E/}-m6g
/** the begin index of the records by the current
)!(etB=`y
JqmKD4p
query */ /Jc i1o
privateint beginIndex; _ 0Ced&i
bB|P`lL
"sU ~|
/** The default constructor */ K~JXP5`(
public Page(){ MW6KEiQ"
fKZgAISF
} <E.$4/T
{Lm%zdk*k
/** construct the page by everyPage mjz<,s`D
* @param everyPage lKF<]25
* */ PC}m.tE
public Page(int everyPage){ SQd`xbIuL
this.everyPage = everyPage; iNAaTU
} HfgK0wIi
Bpw<{U
/** The whole constructor */ Rr>h8Ni <
public Page(boolean hasPrePage, boolean hasNextPage, hPHrq{YZ
Du2v,n5@
!HP/`R
int everyPage, int totalPage, vAMr&[
int currentPage, int beginIndex){ jL[
hB
this.hasPrePage = hasPrePage; J6Q}a7I#
this.hasNextPage = hasNextPage; DfQD!}=
this.everyPage = everyPage; aY7.<p*a
this.totalPage = totalPage; H;OPA8\n
this.currentPage = currentPage; f:-dw6a=s
this.beginIndex = beginIndex; Ew kZzVuX
} t846:Z%[
W=k%aB?p
/** Ly$s0.!
* @return z.7'yJIP#
* Returns the beginIndex. )bGd++2
*/ h8MkfHH7{
publicint getBeginIndex(){ M%NapK
return beginIndex; ?~5J!|r#
} g6. =(je
\!tS|h
/** Lx"a #rZ
* @param beginIndex mTW@E#)n
* The beginIndex to set. `1[GY){?)
*/ bu2'JIDR
publicvoid setBeginIndex(int beginIndex){ t[ZumQ@HC
this.beginIndex = beginIndex; f1RfNiW.
} !B3lsXLSY
hoQ?8}r:
/** #`0iN+qh
* @return fii\&p7z
* Returns the currentPage.
Dy[
YL
*/ F^]?'`7md
publicint getCurrentPage(){ cs%NsnZ
return currentPage; '0xJp|[xVP
} z4nVsgQ$
!r8Jo{(pb
/** KrFV4J[
* @param currentPage a;A&>Ei}
* The currentPage to set. oEWx9c{~$
*/ 2F[;Z*&
publicvoid setCurrentPage(int currentPage){ V!SB9t`E
this.currentPage = currentPage; Z)U#5|sf
} ;')T}wuq
0CD2o\`8
/** 'd"\h#
* @return X&<