Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 1i^!A&
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 *8t_$<'dQ
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 b&s"x?
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 D$!(Iae
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分页支持类: LoqS45-)
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java代码: ,*wa#[
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package com.javaeye.common.util; ENr\+{{%
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import java.util.List; fu"#C}{
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publicclass PaginationSupport { IBo)fE\O
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publicfinalstaticint PAGESIZE = 30; x?y)a9&Hm
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privateint pageSize = PAGESIZE; n2Q ~fx<6%
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privateList items; "+~La{POc
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privateint totalCount; DUFfk6#X}
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privateint[] indexes = newint[0]; M]vcW
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privateint startIndex = 0; L$=6R3GI
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public PaginationSupport(List items, int xi
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totalCount){ ,Hlbl}.ls
setPageSize(PAGESIZE); iqRk\yq<
setTotalCount(totalCount); Y1h8O%?
setItems(items); [:&4 Tp*C
setStartIndex(0); WA\
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} `07xW*K(\Y
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public PaginationSupport(List items, int {r yv7G
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totalCount, int startIndex){ >ZTRwy`_(
setPageSize(PAGESIZE); XJ^dX]4
setTotalCount(totalCount); D
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setItems(items); b MZ-{<+i
setStartIndex(startIndex); ]4^9Tw6
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} wrSw> sE"
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public PaginationSupport(List items, int g\[?U9qN
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totalCount, int pageSize, int startIndex){ U%.OH?;f
setPageSize(pageSize); *UJ.cQ}
setTotalCount(totalCount); r#M0X^4A
setItems(items); Y@)/iwq
setStartIndex(startIndex); p6VS<L
} IH(]RHTp%
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publicList getItems(){ __dSEOGoe
return items; 8b\XC%k
} #&u9z5ywM
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publicvoid setItems(List items){ OHTJQ5%zL
this.items = items; Cak`}J 2
} wK>a&`<
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publicint getPageSize(){ m?G@#[
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return pageSize; .K%1{`.|
} 1-JdQs6
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publicvoid setPageSize(int pageSize){ 2%o@ ?Rp
this.pageSize = pageSize; T rK-XTev
} onqfmQ,3E
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publicint getTotalCount(){ Ns
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return totalCount; t*J*?Ma
} e x"E50
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publicvoid setTotalCount(int totalCount){ .Y`;{)
if(totalCount > 0){ X^Dklqqy
this.totalCount = totalCount; 3'3E:}o|
int count = totalCount / qrdA4S
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pageSize; iwM$U(
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if(totalCount % pageSize > 0)
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count++; "wqN,}bj\
indexes = newint[count]; }KFf
for(int i = 0; i < count; i++){ pb8sx1.j;
indexes = pageSize * gs/ i%O
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} kxvzAKz~
}else{ yzI`&?
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this.totalCount = 0; WZh%iuI{C
} 1 >}x9D
} {~*^jS']5
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publicint[] getIndexes(){ $tm%=g^
return indexes; mc
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} -6KNMk
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publicvoid setIndexes(int[] indexes){ |^:qJ;dOP
this.indexes = indexes; ctk~}(1#
} uPhL?s{
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publicint getStartIndex(){ ./l^Iz&0
return startIndex; (8Ptuh6\\2
} C
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publicvoid setStartIndex(int startIndex){ \img
if(totalCount <= 0) v}`{OE:-J
this.startIndex = 0; VY1&YR}Y
elseif(startIndex >= totalCount) ovXU +8
this.startIndex = indexes d}:eLC
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[indexes.length - 1]; OL%KAEnD
elseif(startIndex < 0) y3+iADo.p
this.startIndex = 0; rWMG6+Scb
else{ E:$EK_?:t
this.startIndex = indexes 93[&'
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[startIndex / pageSize]; p[^a4E_v
} GZt L-
} T1*%]6&V|
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publicint getNextIndex(){ f`W)Z$fN5
int nextIndex = getStartIndex() + b/soU2?^
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pageSize; 1Qk]?R/DN
if(nextIndex >= totalCount) +Y!
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return getStartIndex(); |L<p90
else wl.a|~-
return nextIndex; ,j!%,!n o
} )45#lE3TH
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publicint getPreviousIndex(){ rNN,!
int previousIndex = getStartIndex() - @>Bgld&vl
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pageSize; F%ffnEJg
if(previousIndex < 0) MLT^7'y
return0; Y
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else IY"+hHt
return previousIndex; !)4'[5t"U
} =@ d/SZ|(E
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} l.Q.G<ol
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抽象业务类 H8!)zZ
java代码: ^61;0
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/** !O 0{ .k
* Created on 2005-7-12 6o)RsxN eu
*/ I~F]e|Ehqr
package com.javaeye.common.business; M(U<H;Csk
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import java.io.Serializable; =Cc]ugl7-
import java.util.List; U1;&G
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import org.hibernate.Criteria; lBzfBmEB
import org.hibernate.HibernateException; qM18Ji*
import org.hibernate.Session; Oq*;GR(Q
import org.hibernate.criterion.DetachedCriteria; {,B.OM)J
import org.hibernate.criterion.Projections; 5p]V/<r
import ?mHu eX
Mx Dqp;
org.springframework.orm.hibernate3.HibernateCallback; VDFs.;:s
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org.springframework.orm.hibernate3.support.HibernateDaoS '{w[).c.
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upport; .hRtQU
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import com.javaeye.common.util.PaginationSupport; Van=dzG
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public abstract class AbstractManager extends H8kB.D[7Q
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HibernateDaoSupport { !0_/=mA^
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privateboolean cacheQueries = false; lnGg1/
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privateString queryCacheRegion; >Cam6LJ
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publicvoid setCacheQueries(boolean mNlbiB
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cacheQueries){ &4wwp !J
this.cacheQueries = cacheQueries; " {X0&
} Lvrflx*Q
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publicvoid setQueryCacheRegion(String >abpse
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queryCacheRegion){ {v"Y!/
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this.queryCacheRegion = 26p_fKY
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queryCacheRegion; W$<Y**y9m
} 7m %[$X`
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publicvoid save(finalObject entity){ =y >CO:^G%
getHibernateTemplate().save(entity); "ZL_
} _gEojuaN
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publicvoid persist(finalObject entity){ A-, hm=?
getHibernateTemplate().save(entity); 3a&HW
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} &fsk ESV0
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publicvoid update(finalObject entity){ `.Zm}'
getHibernateTemplate().update(entity); &Xc=PQ:I
} S|T_<FCY
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publicvoid delete(finalObject entity){ 2PSkLS&IM
getHibernateTemplate().delete(entity); NZO86y/
} j{johV+`8
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publicObject load(finalClass entity, }57Jn5&'
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finalSerializable id){ S;u.Ds&
return getHibernateTemplate().load "3'a.b akw
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(entity, id); Igw2n{})w
} {c~w
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publicObject get(finalClass entity, s8 u`v1
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finalSerializable id){ *>HS>#S
return getHibernateTemplate().get !E|R3eX_
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(entity, id); WYP\J1sy
} (zxL!ZR<
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publicList findAll(finalClass entity){ Anqt:(
return getHibernateTemplate().find("from <FAbImE}
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" + entity.getName()); Spu;
} zo("v*d*q
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publicList findByNamedQuery(finalString Hzc}NyJ
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namedQuery){ KS1udH^Zc
return getHibernateTemplate n2:Uu>/
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().findByNamedQuery(namedQuery); @' %XdH
} i[MBO`FF
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publicList findByNamedQuery(finalString query, ,7 m33Pv*
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finalObject parameter){ -SLk8x
return getHibernateTemplate _zzT[}
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().findByNamedQuery(query, parameter); LpI4R
} %%I:L~c
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publicList findByNamedQuery(finalString query, `Y+R9bd
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finalObject[] parameters){ &y7=tEV
return getHibernateTemplate p!)PbSw#
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().findByNamedQuery(query, parameters); :;TF_Sv
} /|#2ehE
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publicList find(finalString query){ hN*v|LFf1
return getHibernateTemplate().find
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(query); 9V~hz (^
} 65VTKlDD
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publicList find(finalString query, finalObject he@Y1CY
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parameter){ S,udpQ7
return getHibernateTemplate().find U>00B|<GJ
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(query, parameter); f`K#=_Kq7
} `:R9M+
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public PaginationSupport findPageByCriteria O2yD{i#l*#
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(final DetachedCriteria detachedCriteria){ v-^<,|vm2f
return findPageByCriteria GMkni'pV
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 9~2iA,xs
} @HnahD
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public PaginationSupport findPageByCriteria /VP #J<6L
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(final DetachedCriteria detachedCriteria, finalint A|@d{g
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startIndex){ pIug$Ke_%
return findPageByCriteria .wTb/x
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(detachedCriteria, PaginationSupport.PAGESIZE, PR AP~P&^
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startIndex); K6)IBV;
} I>w|80%%
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public PaginationSupport findPageByCriteria s jaaZx1
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(final DetachedCriteria detachedCriteria, finalint t$p%UyVE
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pageSize, DHyQ:0q
finalint startIndex){ T-lP=KF=
return(PaginationSupport) +z#+}'mT%
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getHibernateTemplate().execute(new HibernateCallback(){ &B1!,joH~
publicObject doInHibernate SOMAs'=
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(Session session)throws HibernateException { 3h%Nd&_9
Criteria criteria = /QCg E~
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detachedCriteria.getExecutableCriteria(session); 4x=sJ%E
int totalCount = ^5>W`vwp
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((Integer) criteria.setProjection(Projections.rowCount R%t|R79I
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()).uniqueResult()).intValue(); Yt_t>
criteria.setProjection KG96;l@'(
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(null); rTOex]@N
List items = (9'q/qgTO
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criteria.setFirstResult(startIndex).setMaxResults >* F#ZZv}p
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(pageSize).list(); %kH,Rl\g
PaginationSupport ps = X'%BS
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new PaginationSupport(items, totalCount, pageSize, 1N{ >00
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startIndex); VP ?Q$?a
return ps; U+(qfa5(
} &N3a`Ua
}, true); k^B7M}
} Wcl =YB%
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public List findAllByCriteria(final _g D9oK
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DetachedCriteria detachedCriteria){ ?VTP|Z
return(List) getHibernateTemplate V1,~GpNx
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().execute(new HibernateCallback(){ nDLiER;U
publicObject doInHibernate %x}Unk
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(Session session)throws HibernateException { 8u"C7} N_
Criteria criteria = x
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detachedCriteria.getExecutableCriteria(session); An,TunX
return criteria.list(); .Rb1%1bdc
} N>g6KgX{K
}, true); ;qUd]c9oi
} 0&Iu+hv
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public int getCountByCriteria(final X*bOE}
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DetachedCriteria detachedCriteria){ :Fh _Ya0
Integer count = (Integer) DIhV;[\
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getHibernateTemplate().execute(new HibernateCallback(){
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publicObject doInHibernate U9%^gC
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(Session session)throws HibernateException { Q(Pc
Criteria criteria = k>E/)9%ep2
P8ns @VV
detachedCriteria.getExecutableCriteria(session); `V*$pHo
return JiXN"s^mcb
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criteria.setProjection(Projections.rowCount K8QEHc:
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()).uniqueResult(); M{Vi4ehOq
} 3XUsw1,[
}, true); 9IacZ
return count.intValue(); uw`J5TND
} 1vqc8lC
} w'mn O'%
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用户在web层构造查询条件detachedCriteria,和可选的 sE^=]N
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 BG]|iHi
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PaginationSupport的实例ps。 N'21I$ D
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ps.getItems()得到已分页好的结果集 'm/`= QX
ps.getIndexes()得到分页索引的数组 RNcnE1=
ps.getTotalCount()得到总结果数 f4|ir3oy
ps.getStartIndex()当前分页索引 C3K")BO!
ps.getNextIndex()下一页索引 7|)K!
ps.getPreviousIndex()上一页索引 C}:_&^DQ
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 r+h$]OJ
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 zogl2e+
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一下代码重构了。 5d)\Z0s
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我把原本我的做法也提供出来供大家讨论吧: M-C>I;a
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首先,为了实现分页查询,我封装了一个Page类: A_5M\iN\
java代码: ]Lm?3$u$
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/*Created on 2005-4-14*/ g'.(te |
package org.flyware.util.page;
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/** >WY\P4)k
* @author Joa z3yAb"1Hg
* ,T+.xB;Q@
*/ [|L~" BB
publicclass Page { v)v`896S`
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/** imply if the page has previous page */ YH0utc
privateboolean hasPrePage; R]TS5b-
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/** imply if the page has next page */ {6;S= 9E\
privateboolean hasNextPage; [nB4s+NX
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/** the number of every page */ 5?Rzyfwk|
privateint everyPage; ">Y(0^^
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/** the total page number */ KhNOxMZ
privateint totalPage; OZ Hfd7K4A
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/** the number of current page */ Y;>D"C..
privateint currentPage; o/I`L
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/** the begin index of the records by the current MtBoX*"
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query */ VNxhv!w
privateint beginIndex; C+aL8_(R
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/** The default constructor */ /"7_75
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public Page(){ ~L=? F
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} )L$)qfQ~x
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/** construct the page by everyPage ^ <+V[=X
* @param everyPage O|Y~^:ny
* */ DM3 %+ xY
public Page(int everyPage){ xtX`3=s
this.everyPage = everyPage; G[a&r
} ]E}eM@xdD
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/** The whole constructor */ YG#.L}X@C
public Page(boolean hasPrePage, boolean hasNextPage, Pfl8x
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int everyPage, int totalPage, Q<fDtf}
int currentPage, int beginIndex){ &4jc3_UKV
this.hasPrePage = hasPrePage; 9{XV=a v
this.hasNextPage = hasNextPage; mD go@f
this.everyPage = everyPage; |,WP)
this.totalPage = totalPage; ,p9>/)l
this.currentPage = currentPage;
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this.beginIndex = beginIndex; oS#PBql4
} _REAzxeS
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/** XSe\@t~&g
* @return N2$uw@s
* Returns the beginIndex. y5`$Aa4~
*/ T!Z).PA#
publicint getBeginIndex(){ F`RPXY`ux
return beginIndex; 4s7&*dJ
} J @^Ypq
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/** I7Xm~w!{qk
* @param beginIndex 2dJP|T9H
* The beginIndex to set. ytyB:# J
*/ ],l\HHQ
publicvoid setBeginIndex(int beginIndex){ V&Q_iE
this.beginIndex = beginIndex; Fu[<zA^
} /SD(g@G,
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/** ZXC_kmBN/
* @return PHxNo)
* Returns the currentPage. K2!GpGZu
*/ {YF(6wVl
publicint getCurrentPage(){ nUf0TkA
return currentPage; fHiS'R
} H_>9'(
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/** <
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* @param currentPage >.&E-1[+:
* The currentPage to set. }0AoV&75
*/ #R*7y%cO
publicvoid setCurrentPage(int currentPage){ O 4'/C]B2
this.currentPage = currentPage; $nr=4'yZ
} tX~*.W:
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/** KtD
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* @return |./{,",
* Returns the everyPage. >9<