Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 09f:%!^u
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 3lyk/',
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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 iaqhP7!
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 q/o|uAq
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。 *3yeMxa
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分页支持类: I 9yNTD
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java代码: #xqeCX4p
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package com.javaeye.common.util; G;n'c7BV
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import java.util.List; p< fKj
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publicclass PaginationSupport { +F &,,s"&
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publicfinalstaticint PAGESIZE = 30; #?xhfSgr
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privateint pageSize = PAGESIZE; hcw)qB,s
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privateList items;
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privateint totalCount; Dt~Jx\\
gI&& LwT4
privateint[] indexes = newint[0]; &%~2Wm
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privateint startIndex = 0; Lm kv.XF
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public PaginationSupport(List items, int ZQT14. $L
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totalCount){ +\FTR
setPageSize(PAGESIZE); 5!ll
#/ {`
setTotalCount(totalCount); /B$"fxFf
setItems(items); D6iHkDTg
setStartIndex(0); ti:qOSIDTA
} 7$(>Z^ Em
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public PaginationSupport(List items, int ^h+<Q%'a'
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totalCount, int startIndex){ oYNP,8r^
setPageSize(PAGESIZE); :t\pi.uWt
setTotalCount(totalCount); Epm\=s
setItems(items); $oO9N^6yF
setStartIndex(startIndex); eRC
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} VGoD2,(b^
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public PaginationSupport(List items, int A
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totalCount, int pageSize, int startIndex){ \UI7H1XDH
setPageSize(pageSize); ]X,C9
setTotalCount(totalCount); }/ 6Q3B
setItems(items); ]HP
aM
setStartIndex(startIndex); @O}%sjC1
} _B`'1tNx
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publicList getItems(){ +tL]qOBP
return items; 8\m_.e
} d`LBFH,
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publicvoid setItems(List items){ etdI:N*x
this.items = items; Vx@JP93|
} SI=vA\e
sE$!MQb
publicint getPageSize(){ .g.v
return pageSize; 'rJkxU{
} A4.Q\0
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publicvoid setPageSize(int pageSize){ jnvi_Rodm
this.pageSize = pageSize; YC#N],#
} 3]BK*OqJ
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publicint getTotalCount(){ &g R+D
return totalCount; DVxW2J
} (tV/.x*G
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publicvoid setTotalCount(int totalCount){ 5" <7
if(totalCount > 0){ S[rz=[7{
this.totalCount = totalCount; 3z9}cOFq]z
int count = totalCount / )CQ'kHT<e
${^WM}N
pageSize; 12;"=9e!
if(totalCount % pageSize > 0) ^>02,X
mk
count++; )J4XM(
indexes = newint[count]; !6:kJL}U
for(int i = 0; i < count; i++){ GU'/-6-T
indexes = pageSize * '#REbY5ev
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i; Fyy)665x/
} A+*M<W
}else{ d@~Hp?
this.totalCount = 0; _,:gSDW|
} VSa\X~
} ?sV0T)uk
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publicint[] getIndexes(){ )%lPa|7s
return indexes; [V_Z9-f*
} 4(>|f_$
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publicvoid setIndexes(int[] indexes){ \EF^Ag
this.indexes = indexes; s(W]>Ib
} '+LbFGrO3
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publicint getStartIndex(){ ?zW4|0
return startIndex; Vo^
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} _oK*1#Rm8
/?<o?IR~6
publicvoid setStartIndex(int startIndex){ H'E(gc)>)
if(totalCount <= 0) $s-/![
6
this.startIndex = 0; VWqmqR%
elseif(startIndex >= totalCount) )
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this.startIndex = indexes f0+)%gO{
&GF@9BXI3
[indexes.length - 1]; "w.gP8`
elseif(startIndex < 0) ;5qZQ8`4
this.startIndex = 0; oUrNz#U
else{ Vvk1 D(
this.startIndex = indexes U_ELeW5@
555j@
[startIndex / pageSize]; NO5\|.,Z
} KECo7i= e
} +~b@W{
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publicint getNextIndex(){ I;xrw?=\L
int nextIndex = getStartIndex() + g,Z8I;A^
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pageSize; qyzmjV6J2
if(nextIndex >= totalCount) ~R-P%l P
return getStartIndex(); H/"$#8-/
else Q-<N)K$F(4
return nextIndex; ayR=GqZ1
} S-{=4b'
SPfz/ q{
publicint getPreviousIndex(){ W]b>k lp;
int previousIndex = getStartIndex() - m{T:<:q~
,MH/lQq%
pageSize; tnL $v2e6q
if(previousIndex < 0) v4c*6(m
return0; [\eh$r\
else -I
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return previousIndex; D@@J7
} }ZaZPB/_}P
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} ZBYFQTEE
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抽象业务类 GHeucG}?
java代码: <k59Ni9
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/** >1luLp/,$
* Created on 2005-7-12 ;ED` 7
*/ JmlMfMpXMs
package com.javaeye.common.business; yR?S]
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import java.io.Serializable; ;1x(~pD*o
import java.util.List; =+>cTV
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import org.hibernate.Criteria; R^u 1(SF
import org.hibernate.HibernateException; O7D aVlln
import org.hibernate.Session; n{'LF #4l
import org.hibernate.criterion.DetachedCriteria; f8ucJ.{"
import org.hibernate.criterion.Projections; >#pZ`oPEAv
import FYe#x]ue
P_e9>t@
org.springframework.orm.hibernate3.HibernateCallback; >+}yI}W;e
import E}-Y!,v^
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org.springframework.orm.hibernate3.support.HibernateDaoS LT+QW
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upport; 3`
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import com.javaeye.common.util.PaginationSupport; B h<DqN
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public abstract class AbstractManager extends \3K%>
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HibernateDaoSupport { P|U9f6^3
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privateboolean cacheQueries = false; 7bk=D~/nSg
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privateString queryCacheRegion; T( LlNq
u7>{#]
publicvoid setCacheQueries(boolean k`aHG8S\
RX])#=Cs
cacheQueries){ Ec3TY<mVr
this.cacheQueries = cacheQueries; #!yW)RG
} ;q5.\m:
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publicvoid setQueryCacheRegion(String rf\/Y"D
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queryCacheRegion){ .I
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this.queryCacheRegion = CpGy'Ia
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queryCacheRegion; :<QmG3F
} H@|h
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publicvoid save(finalObject entity){ j'IZ etT
getHibernateTemplate().save(entity); sa?Ul)L2
} g.,_E4L
q0t}
publicvoid persist(finalObject entity){ eVRPjVzQ'Q
getHibernateTemplate().save(entity); 9_Ws8nE
} ,SV34+(
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publicvoid update(finalObject entity){ ]K0G!T R<
getHibernateTemplate().update(entity); BmhIKXE{*
} _48@o^{
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publicvoid delete(finalObject entity){ hBRcI0R
getHibernateTemplate().delete(entity); %mF Z!(
} "h\ (a<
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publicObject load(finalClass entity, Bx" eX>A8
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finalSerializable id){ u%24%
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return getHibernateTemplate().load ]yAOKmS
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(entity, id); 3'jH,17lWV
} dTTC6?yPXf
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publicObject get(finalClass entity, qK-\`m
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finalSerializable id){ \c(Z?`p]R1
return getHibernateTemplate().get "K)ue@?
U32&"&";c
(entity, id); wSPwa,)7s
} 7;rf$\-&
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publicList findAll(finalClass entity){ . UaLP
return getHibernateTemplate().find("from '_fj:dy
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" + entity.getName()); T*1 `MIkv
} (k$KUP
;!:@3c
publicList findByNamedQuery(finalString ]!'}{[1}
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namedQuery){ v/G)E_
return getHibernateTemplate BenUyv1d
o |"iW" +
().findByNamedQuery(namedQuery); ]w/%>
} P. Gmj;
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publicList findByNamedQuery(finalString query, 6` 4,
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finalObject parameter){ =IEei{
return getHibernateTemplate c[zGWF#1>
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().findByNamedQuery(query, parameter); {^A,){uX]
} .T*89cEu
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publicList findByNamedQuery(finalString query, ,sZ)@?e
[]<N@a6VA>
finalObject[] parameters){ &s~b1Va
return getHibernateTemplate shuoEeoo
r"$~Gg.%(
().findByNamedQuery(query, parameters); kJNu2S
} VK[`e[.C
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publicList find(finalString query){ YF$nL(
return getHibernateTemplate().find h
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(query); s<'WTgy1i
} #McX
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publicList find(finalString query, finalObject <d~IdK'\x
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parameter){ 7OdJ&Gzd
return getHibernateTemplate().find /;;$9O9
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(query, parameter); Z_(P^/
} PM8*/4Cu.5
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public PaginationSupport findPageByCriteria $0,lE+7*
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(final DetachedCriteria detachedCriteria){ /7&WFCc)(
return findPageByCriteria "VgPaz#
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); >p>B-m
} ~yu\vqN
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public PaginationSupport findPageByCriteria Ocf :73t
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(final DetachedCriteria detachedCriteria, finalint <G /a-Z
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startIndex){ 3Bbd2[<W
return findPageByCriteria 4;)aGN{e
#<81`%
(detachedCriteria, PaginationSupport.PAGESIZE, LPS]TG\
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startIndex); Jl@YBzDfF
} 8fC5O
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public PaginationSupport findPageByCriteria fDrjR6xV
4|/=]w
(final DetachedCriteria detachedCriteria, finalint xF8 8'p'
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pageSize, 6fV;V:1{
finalint startIndex){ b>'y[P!
return(PaginationSupport) _qjkiKm?1F
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getHibernateTemplate().execute(new HibernateCallback(){ d_)VeuE2
publicObject doInHibernate =@s {H +
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(Session session)throws HibernateException { Fm`c
Criteria criteria = fa2hQJ02
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detachedCriteria.getExecutableCriteria(session); zdgSqv
int totalCount = g;\_MbfP
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((Integer) criteria.setProjection(Projections.rowCount H&=fD` Xq
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()).uniqueResult()).intValue(); 3)_(t.$D
criteria.setProjection @
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(null); 2T3b6
List items = ~vw$Rnotz
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criteria.setFirstResult(startIndex).setMaxResults P|rreSv*
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(pageSize).list(); a
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PaginationSupport ps = qV:TuR-|w
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new PaginationSupport(items, totalCount, pageSize, }q=uI`
#8i9@w
startIndex); ]<:qMLg
return ps; _g%h:G&^
} hZUnNQ
}, true); 6a4-VX5
} p.x!dt\1kC
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public List findAllByCriteria(final 3<X*wVi)NN
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DetachedCriteria detachedCriteria){ g%%j"Cz1
return(List) getHibernateTemplate df7 xpV
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().execute(new HibernateCallback(){ ;[! W*8.c
publicObject doInHibernate ?.6fVSa
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(Session session)throws HibernateException { Ht&%`\9s
Criteria criteria = _7N^<'B
#jT=;G7f2
detachedCriteria.getExecutableCriteria(session); R[f@g;h
return criteria.list(); 9 $Ud\
} LHHDD\X
}, true); c-=z<:Kf
}
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k*!f@ M
public int getCountByCriteria(final BB3wG*q
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DetachedCriteria detachedCriteria){ \) vI-
Integer count = (Integer) ;)'
}J(o!2.
getHibernateTemplate().execute(new HibernateCallback(){ ~s-"u
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publicObject doInHibernate IpKpj"eoLy
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(Session session)throws HibernateException { +|6 u
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Criteria criteria = xL\R-H^c]
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detachedCriteria.getExecutableCriteria(session); D0
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return 2F|06E'
}D*5PV%d
criteria.setProjection(Projections.rowCount ,xuA%CF-S
epQdj=h
()).uniqueResult(); '<% ;Nv
} T}y@ a^#
}, true); Nj$h/P
return count.intValue(); s#%P9A
} S%2q X"8
} <S(`e/#[
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用户在web层构造查询条件detachedCriteria,和可选的 `xie/
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 qZ rv2dT
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PaginationSupport的实例ps。 /r Z`e'}
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ps.getItems()得到已分页好的结果集 95b65f
ps.getIndexes()得到分页索引的数组 SZL('x,"^
ps.getTotalCount()得到总结果数 ~v^I*/uY
ps.getStartIndex()当前分页索引 BM_Rlcx~
ps.getNextIndex()下一页索引 wSIfqf+y
ps.getPreviousIndex()上一页索引 >SaT?k1E
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Vc?=cQ'c
al{}p
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=` KV),\
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ~#nbD-*#
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做
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一下代码重构了。 ];hK5
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我把原本我的做法也提供出来供大家讨论吧: V
jZx{1kCR
8bW,.to(?x
首先,为了实现分页查询,我封装了一个Page类: OVhtU+r
java代码: Olltu"u
x5"F`T>Y
bYB:Fe=2
/*Created on 2005-4-14*/ ~-K<gT/
package org.flyware.util.page; /4bHN:I]M
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/** YCS8qEP&
* @author Joa dXewS_7
* 0\}%~e
*/ ODE^;:z !
publicclass Page { y-k]Tr
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/** imply if the page has previous page */ tk~<tqMq
privateboolean hasPrePage; PYJ8\XZ1_N
5`Oaf\S
/** imply if the page has next page */ v]e6CZwo
privateboolean hasNextPage; 0="U'|J_
cH{[\F"Eb
/** the number of every page */ wxIWh>pZa
privateint everyPage; +-OnO7f
VMgO1-F
/** the total page number */ aOK,Mm:iO
privateint totalPage; E6_.Q `!ll
Dvz}sQZ
/** the number of current page */ d|RDx;rl8
privateint currentPage; 7@l.ZECJ1
-:NFF'
/** the begin index of the records by the current |"o/GUI~
Ld$e -dB
query */ ?^3Q5ye
privateint beginIndex; a+#Aitd
yjB.-o('
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/** The default constructor */ f<}>*xH/k
public Page(){ !K5D:x
i\94e{uty[
} &I=F4 z
m*
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/** construct the page by everyPage r8Pdk/CW^
* @param everyPage /FW{>N1
* */ PAHkF&
public Page(int everyPage){ G'0]m-)dw
this.everyPage = everyPage; U?sio%`(
} JtGBNz!"
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/** The whole constructor */ ~
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public Page(boolean hasPrePage, boolean hasNextPage, HI*j6H?\
$ ";NS6 1
G@I/Dy
int everyPage, int totalPage, :bBMy\(u
int currentPage, int beginIndex){ SXx;-Ws
this.hasPrePage = hasPrePage; 3Z-N*bhC
this.hasNextPage = hasNextPage; $S_G:}tna
this.everyPage = everyPage; >cM}M =4s
this.totalPage = totalPage; ewD=(y r
this.currentPage = currentPage; -lNT"9
this.beginIndex = beginIndex; cs6I
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} Hb|y`O k
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/** +4--Dl?
* @return
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* Returns the beginIndex. /By`FW Y
*/ dp'xd>m
publicint getBeginIndex(){ R7j'XU
return beginIndex; }!n90
9L
} l7M![Ur
4!^flKZQ
/** oNK-^N?-T
* @param beginIndex B`1"4[{
* The beginIndex to set. `-QY<STTP9
*/ ZXL
publicvoid setBeginIndex(int beginIndex){ pR*)\@ma
this.beginIndex = beginIndex; "? t@Y
} <oP"kh<D4
"2a&G3}t"
/** AKkr
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* @return |ZBHXv
* Returns the currentPage. Rd^X.
*/ -|aNHZr
publicint getCurrentPage(){ sUEvL(%nY
return currentPage; BiI}JEp4o
} yRGv {G[59
'X@>U6s
/** @/yJTMcf
* @param currentPage Zwxu3R_
* The currentPage to set. q;0QI{:5v
*/ ;*=MI/"N
publicvoid setCurrentPage(int currentPage){ ~w9.}
this.currentPage = currentPage; #HF;yAc
} >ho$mvT
yYri.n
/** \~bx%VWW4
* @return X!/o7<
* Returns the everyPage. !1<?ddH6
*/ L4?)N&V
publicint getEveryPage(){ xHo
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return everyPage; s`E^1jC
} u^NZsuak
dOfEEqPI
/** pg:1AAhT[
* @param everyPage ="=Aac#n`
* The everyPage to set. vx&r
*/ @&
vtY._
publicvoid setEveryPage(int everyPage){ 2^.qKY@g@
this.everyPage = everyPage; B^C!UWN>%X
} { :m%n-
e6JT|>9A7
/** :2_8.+:
* @return yw3E$~ k
* Returns the hasNextPage. }jWZqIqj
*/ S85}&\m&4
publicboolean getHasNextPage(){ dD{{G:V
return hasNextPage; ]BiLLDz(
} P.Uz[_&l6
ck"lX[d1
/** WUnmUW[/
* @param hasNextPage f#3U,n8:
* The hasNextPage to set. asQXl#4r
*/ @ a?^2X^
publicvoid setHasNextPage(boolean hasNextPage){ ; M%n=+[O
this.hasNextPage = hasNextPage; tF@hH}{;
} 6x$1En
}q~M$
/** =|_{J"sv
* @return *#n?6KqZ
* Returns the hasPrePage.
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*/ RO10$1IW.2
publicboolean getHasPrePage(){ u_~*)w+mS@
return hasPrePage; },@1i<Bb
} 5C^oqUZ
d
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/** ^A"TY
* @param hasPrePage ci~pM<+
* The hasPrePage to set. 00d<V:Aoy
*/ DL:wiQ
publicvoid setHasPrePage(boolean hasPrePage){ B- `,h pp
this.hasPrePage = hasPrePage; q\f Z Q
} Vs0T*4C=n
5u=(zg
/** ?%Pd:~4D
* @return Returns the totalPage. lNw8eT~2
* D:yj#&I
*/ /y.+N`_
publicint getTotalPage(){ rnV\O L
return totalPage; SK@%r
} 7@@,4_q E
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/** ;Uxr+,x~
* @param totalPage ckWK+
* The totalPage to set. >hcze<^S
*/ &1:_+
publicvoid setTotalPage(int totalPage){ 4)i(`/U
this.totalPage = totalPage; >%o\Ue
} bQ3EBJT{P
b?~%u+'3
} O
DLRzk(
!N@d51T=N
0 kM4\En
9O.okU
4%(\y"T
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一
x=%p~$C
e/p 2| 4;
个PageUtil,负责对Page对象进行构造: 0F495'*A
java代码: +mgmC_Q(0
BcfW94
wM"PJG
/*Created on 2005-4-14*/ /4}B}"`Sl=
package org.flyware.util.page; mT7B#^H
L/U^1=Wi*O
import org.apache.commons.logging.Log; \:To>A32
import org.apache.commons.logging.LogFactory; v9<'nU WVR
0E5"}8
/** 1zDat@<H
* @author Joa :=iP_*#
* nSM8o<)H
*/ %rmn+L),;
publicclass PageUtil { \.`;p
Pr%Y!|
privatestaticfinal Log logger = LogFactory.getLog m@z.H ;
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(PageUtil.class); c8^M::NI
$@[`v0y*
/** _shoh
* Use the origin page to create a new page BXCB/:0
* @param page r ^m8kYezQ
* @param totalRecords `k 5'nnyP
* @return J ^y1=PM
*/ IYo{eX~=
publicstatic Page createPage(Page page, int =u5a'bp0;;
9uNkd2#
totalRecords){ kma)DW
return createPage(page.getEveryPage(), /5l"rni
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page.getCurrentPage(), totalRecords); |A'y|/)#Z
} <yw6Om:n<
xE2sb*
/** &RzkM4"
* the basic page utils not including exception
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xnfMx$fD
handler u?J!3ZEtb
* @param everyPage #%;QcDXRe
* @param currentPage 5 +Ei!E89
* @param totalRecords us,!U
* @return page *u i!|;
*/ v*.[O/,EBR
publicstatic Page createPage(int everyPage, int -/y]'_a
v `a:Lj
currentPage, int totalRecords){ X#|B*t34
everyPage = getEveryPage(everyPage); 7<T1#~w4L
currentPage = getCurrentPage(currentPage); Q=,6W:j
int beginIndex = getBeginIndex(everyPage, $y0[AB|V
k"kGQk4
currentPage); ,u:J"epM
int totalPage = getTotalPage(everyPage, e6
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!>,\KxnM
totalRecords); /f5*KRM
boolean hasNextPage = hasNextPage(currentPage, 4Pbuv6`RK
t==CdCl
totalPage); "}ms|
boolean hasPrePage = hasPrePage(currentPage); rF3QmR?l
]d4`PXI
returnnew Page(hasPrePage, hasNextPage, |8bqn^@$t
everyPage, totalPage, zA
; 7Nv$3
currentPage, \I@hDMqv
+PlA#DZu
beginIndex);
$:7T
} i1(}E#
,v#F6xv8
privatestaticint getEveryPage(int everyPage){ X\-IAv
return everyPage == 0 ? 10 : everyPage; _VjfH2Y
} )2t DX=D
#K:!s<_"
privatestaticint getCurrentPage(int currentPage){ WS!:w'rzr
return currentPage == 0 ? 1 : currentPage; fI_I0dc.p
} z frEM
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privatestaticint getBeginIndex(int everyPage, int L[|($vQ"
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currentPage){ StuQ}
return(currentPage - 1) * everyPage; y.xyr"-Q
} QgR3kc^7/
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privatestaticint getTotalPage(int everyPage, int >{v,HOxl
wX!q dII)
totalRecords){ Z~?1xJ&