Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 %h3L
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ;7wwY$PBH
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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 ./';P<)
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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 - a
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分页支持类: y4 dp1<t%
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java代码: J&n ^y
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package com.javaeye.common.util; @*bvMEE
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import java.util.List; :QxL 9&"
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publicclass PaginationSupport { :P j W:]
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publicfinalstaticint PAGESIZE = 30; u'#`yTB6b
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privateint pageSize = PAGESIZE; %H 8A=
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privateList items; DN4fP-m-
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privateint totalCount; cZCGnzy
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privateint[] indexes = newint[0]; v; je <DT
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privateint startIndex = 0; 03PN{<
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public PaginationSupport(List items, int }R7sj
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totalCount){ /UEV8 1
setPageSize(PAGESIZE); BUcaj.S
setTotalCount(totalCount); h9tB''ePE
setItems(items); Usa{J:
setStartIndex(0); Gr`MGQ,
} fF8a 1XV
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public PaginationSupport(List items, int <O
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totalCount, int startIndex){ J-@o@!o
setPageSize(PAGESIZE); ?/o2#iJx
setTotalCount(totalCount); {m?K2]](
setItems(items); K> c8r8!
setStartIndex(startIndex); Z/XM`Cy
} Vy?R/
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public PaginationSupport(List items, int H1aV}KD
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totalCount, int pageSize, int startIndex){ fW_}!`:
setPageSize(pageSize); d~togTs1
setTotalCount(totalCount); pDLu +}@
setItems(items); c n\k`8
setStartIndex(startIndex); f_Wkg)g
} cq'}2pob
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publicList getItems(){ N/`TrWVF
return items; \;3B?8wbIl
} ;'2`M
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publicvoid setItems(List items){ c+,7Zu!
this.items = items; x>1iIpBv^
} wGov|[X
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publicint getPageSize(){ ?.rH;:9To
return pageSize; ,7n;|1`
} >z fq*_
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publicvoid setPageSize(int pageSize){ (T>?8K_d
this.pageSize = pageSize; FUW(>0x?
} $UFge%`,q@
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publicint getTotalCount(){ Wx']tFn"
return totalCount; +d6Aw}*
} ,ZzB#\
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publicvoid setTotalCount(int totalCount){ a>&;K@
if(totalCount > 0){ |Ak =-.
this.totalCount = totalCount; 4~m.#6MT
int count = totalCount / cu.*4zs
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pageSize; %2rHvF=
if(totalCount % pageSize > 0) =sUl`L+w,L
count++; 3<e(@W}n-M
indexes = newint[count]; .NzW@|
for(int i = 0; i < count; i++){ ;Sx'O
indexes = pageSize * &viwo}ls0
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i; Tdk2436=
} bo~{<UT
}else{ &6,Yjs:T m
this.totalCount = 0; "2#-xOCO
} n!l./>N
} \GbHS*\+
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publicint[] getIndexes(){ 1Rb XM n
return indexes; !yV,|)y5F
} ]]h:#A2
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publicvoid setIndexes(int[] indexes){ @^y?Bh9jQ
this.indexes = indexes; }ZM*[j
} EL 8N[]RF
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publicint getStartIndex(){ nyl8=F:V
return startIndex; 0]h8)EW
} &z xBi"
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publicvoid setStartIndex(int startIndex){ 4mM2C`I
if(totalCount <= 0) l~Ie#vak
this.startIndex = 0; 3j=%De
elseif(startIndex >= totalCount) \CJx=[3(
this.startIndex = indexes =jV%O$Fx
f'zU^/$rf
[indexes.length - 1]; R[>;_}5">
elseif(startIndex < 0) 7q2"b?|h
this.startIndex = 0; Zy!)8<Cgm'
else{ ?sjZ13 SUa
this.startIndex = indexes :cmI"Bo
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[startIndex / pageSize]; v0hfY
} }`<>$2b
} >XXMIz:
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publicint getNextIndex(){ Rvu3Qo+
int nextIndex = getStartIndex() + ~J. Fl[
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pageSize; <*r<+S
if(nextIndex >= totalCount) QNa}M{5>h
return getStartIndex(); IioE<wS)
else |W~V@n8"6
return nextIndex; QGbD=c7
} f,`}hFD
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publicint getPreviousIndex(){ '4^V4i
int previousIndex = getStartIndex() - Rbj+P;t&
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pageSize; z:i X]df
if(previousIndex < 0) w
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return0; fN"oa>X
else -'H+lrmv
return previousIndex; Y)4Nydq
} [b
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} s68_o[[E
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抽象业务类 uuUVE/^V'
java代码: {Y*]Qc
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/** uVuToMCp
* Created on 2005-7-12 fD#&: )
*/ ap'kxOf"1
package com.javaeye.common.business; A_(+r
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import java.io.Serializable; Am0.c0h
import java.util.List; CN$A-sjZ
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import org.hibernate.Criteria; J!
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import org.hibernate.HibernateException;
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import org.hibernate.Session; -g[*wN8
import org.hibernate.criterion.DetachedCriteria; /o1)ZC$
import org.hibernate.criterion.Projections; Ni@e/|
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import :UhFou_D4l
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org.springframework.orm.hibernate3.HibernateCallback; 4gv XJK-
import DCt:EhC
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org.springframework.orm.hibernate3.support.HibernateDaoS xu?QK6D:
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upport; 9-E>n)
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import com.javaeye.common.util.PaginationSupport; s-N?Tzi
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public abstract class AbstractManager extends ^Lfn3.M
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HibernateDaoSupport { ZesD(
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privateboolean cacheQueries = false; /L|}Y242
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privateString queryCacheRegion; 5WNg+
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publicvoid setCacheQueries(boolean SQKY;p
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cacheQueries){ 6% y)
this.cacheQueries = cacheQueries; / ?[gB:s
} wCTR-pL^
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publicvoid setQueryCacheRegion(String zl#&Qm4Ot
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queryCacheRegion){ &?g!}Ky \
this.queryCacheRegion = CG>2,pP,
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queryCacheRegion; <:{[Zvl'k
} ?a0}^:6
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publicvoid save(finalObject entity){ 8}#Lo9:,d
getHibernateTemplate().save(entity); ylxfh(
} '=b&)HbeK
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publicvoid persist(finalObject entity){ x5 ~E'~_
getHibernateTemplate().save(entity); vlN. OQ
} P[P72WR
So 6cm|{
publicvoid update(finalObject entity){ !6/IKh`J
getHibernateTemplate().update(entity); t02"v4_i
} P_lcX;O
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publicvoid delete(finalObject entity){ 5GFnfc}
getHibernateTemplate().delete(entity); XK/@!ud"`
} (l P4D:X
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publicObject load(finalClass entity, O/^w!
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finalSerializable id){ QRHm|f9_C
return getHibernateTemplate().load 2[YD&
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(entity, id); 4qz{D"M
} iY'hkr w
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publicObject get(finalClass entity, w@ylRq
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finalSerializable id){ h8-tbHgpb
return getHibernateTemplate().get !>@V#I
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(entity, id); P"~T*Qq-R
} g)D}p@>m
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publicList findAll(finalClass entity){ (@o
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return getHibernateTemplate().find("from nJ#@W b@
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" + entity.getName()); 9la~3L_g
} (dipKs?K
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publicList findByNamedQuery(finalString [}>6n72gNh
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namedQuery){ <r`Jn49
return getHibernateTemplate >~>[}d;glw
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().findByNamedQuery(namedQuery); n rB27
} RF2XJJ
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publicList findByNamedQuery(finalString query, Xl+a@Ggtq
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finalObject parameter){ =l'_*B8
return getHibernateTemplate 6ch[B`[h,
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().findByNamedQuery(query, parameter); $K5s)!
} 9qy 9
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publicList findByNamedQuery(finalString query, cH-Zj
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finalObject[] parameters){ ']Xx#U N
return getHibernateTemplate p2vUt
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().findByNamedQuery(query, parameters); % P)}(e6y
} #=#$b _6*
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publicList find(finalString query){ xa0%;nFKe
return getHibernateTemplate().find TXl9c6
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(query); 3&Rqz9 W
} RX\O'Zwl j
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publicList find(finalString query, finalObject 76r
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parameter){ Q%1;{5
return getHibernateTemplate().find T2; 9
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(query, parameter); Ol[IC
} <!(n5y_
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public PaginationSupport findPageByCriteria =~m"TQv
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(final DetachedCriteria detachedCriteria){ , tj7'c$0
return findPageByCriteria L^s;kkB
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(detachedCriteria, PaginationSupport.PAGESIZE, 0);
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} \bSHBTK
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public PaginationSupport findPageByCriteria =I}V PxhE7
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(final DetachedCriteria detachedCriteria, finalint {/!Gh\i
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startIndex){ g|_*(=Q
return findPageByCriteria ?R:Hj=.
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(detachedCriteria, PaginationSupport.PAGESIZE, 'oL[rO~j
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startIndex); IfCqezd
} o:\a
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public PaginationSupport findPageByCriteria <!>}t a
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(final DetachedCriteria detachedCriteria, finalint d`7] reh
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pageSize, Vp^sER
finalint startIndex){
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return(PaginationSupport) g(H3arb&
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getHibernateTemplate().execute(new HibernateCallback(){ [KJL%u|8/
publicObject doInHibernate :C6rN}_k
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(Session session)throws HibernateException { ra2q. H
Criteria criteria = )ix E
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detachedCriteria.getExecutableCriteria(session); !P3|T\|]+
int totalCount = M0
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((Integer) criteria.setProjection(Projections.rowCount RR=l&uT
}!Lr!eALr
()).uniqueResult()).intValue(); h!~yYNQ"
criteria.setProjection lM,:c.R
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(null);
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List items = TaT&x_v^~a
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criteria.setFirstResult(startIndex).setMaxResults 9Bw"VN]W
vy?YA-
(pageSize).list(); e5KF ~0`
PaginationSupport ps = Sn&%epi
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new PaginationSupport(items, totalCount, pageSize, Mv=;+?z!
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startIndex); e)"cm;BJ^P
return ps; Lr:K0A.Ch
} m
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}, true); oX,M;;Yq
} ,u2<()`8D
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public List findAllByCriteria(final ) &-E@% \
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DetachedCriteria detachedCriteria){ ^yTN(\9
return(List) getHibernateTemplate U$bM:d
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().execute(new HibernateCallback(){ R FiR)G ,
publicObject doInHibernate |-D.
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(Session session)throws HibernateException { `,[c??h
Criteria criteria = 0in6z
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detachedCriteria.getExecutableCriteria(session); W:J00rsv=`
return criteria.list(); MJ08@xGa
} xpwzz O*U
}, true); cTp+M L
} bxq`E!]
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public int getCountByCriteria(final v^G5
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DetachedCriteria detachedCriteria){ oZtz"B
Integer count = (Integer) # 95/,k
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getHibernateTemplate().execute(new HibernateCallback(){ m(Ynl=c
publicObject doInHibernate [4yQ-L)]e
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(Session session)throws HibernateException { ;@hP*7Lm
Criteria criteria = r1]^#&V;MC
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detachedCriteria.getExecutableCriteria(session); w"|c;E1;_
return C@i g3fhV
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criteria.setProjection(Projections.rowCount 'C<=b UM
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()).uniqueResult(); GkFNLM5'
} V-3]h
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}, true); ?M2@[w8_
return count.intValue(); ?dYDfyFfB
} ntejFy9_
} v( B4Bz2
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用户在web层构造查询条件detachedCriteria,和可选的 (k~c]N)v
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 J:a^''
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PaginationSupport的实例ps。 -(EqBr@_
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ps.getItems()得到已分页好的结果集 ] W_T(C*
ps.getIndexes()得到分页索引的数组 OHw6#N$\
ps.getTotalCount()得到总结果数 9'M_t Mm5
ps.getStartIndex()当前分页索引 }1wuH
ps.getNextIndex()下一页索引 I_rVeMw=
ps.getPreviousIndex()上一页索引 Fz% n!d
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5`Bb0=j
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 <PxEl4
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一下代码重构了。 mqL+W
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我把原本我的做法也提供出来供大家讨论吧: )j]RFt
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首先,为了实现分页查询,我封装了一个Page类: ;Mz]uk
java代码: 7Fp2=j
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/*Created on 2005-4-14*/ XN@5TZoaW
package org.flyware.util.page; YAog;QL
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/** tdm /U
* @author Joa VbjFQ@[l!
* 1tDN$rM5
*/ Z6p>R;9n
publicclass Page { I(.XK ucU
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/** imply if the page has previous page */ H;6V
privateboolean hasPrePage; o>YRKb
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/** imply if the page has next page */ oaHBz_pg
privateboolean hasNextPage; ~EBZlTN
*K;~V
/** the number of every page */ -Da_#_F
privateint everyPage; Sv ,_G'
*sTQ9 Kr
/** the total page number */ ]:;gk&P
privateint totalPage; ":Q^/;D}U
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/** the number of current page */ Z&%61jGK
privateint currentPage; wa C%o%fD
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/** the begin index of the records by the current w%ForDB>P
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query */ 8Y9mB#X
privateint beginIndex; 7"NUof?i
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/** The default constructor */ p82qFzq#
public Page(){ i=ba=-"Mt
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} o|+tRl
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/** construct the page by everyPage Ah,Zm4:
* @param everyPage i[<O@Rb
* */ 6Z$T&Ul{
public Page(int everyPage){ W+S>/`N
this.everyPage = everyPage; 46vz=# ,6L
} e\89;)
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/** The whole constructor */ P|\,kw>l
public Page(boolean hasPrePage, boolean hasNextPage, Y4_i=}\*vf
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int everyPage, int totalPage, @*oi1_q
int currentPage, int beginIndex){ TzOf&cs/r
this.hasPrePage = hasPrePage; tFGLqR%/
this.hasNextPage = hasNextPage; "Xm'(c(
this.everyPage = everyPage; N5_v}<CN
this.totalPage = totalPage; ()7=(<x{
this.currentPage = currentPage; NM4 n
this.beginIndex = beginIndex; lBCM;#P
} Bpgl
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/** NYCkYI
* @return . "R
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* Returns the beginIndex. W46sKD;\^W
*/ ' o5,P/6
publicint getBeginIndex(){ n8?gZ` W
return beginIndex; |peZ`O^~
} 3Ry?{m^
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/** aAX 8m
* @param beginIndex s:jwwE2
* The beginIndex to set. -Xj+7}4
*/ *mYec~
publicvoid setBeginIndex(int beginIndex){ eq"~by[Uq
this.beginIndex = beginIndex; {PfE7KH
} wtY#8'^$&
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/** B *:6U+I
* @return A81kb
* Returns the currentPage. xTe?*
*/ p~r +2(J
publicint getCurrentPage(){ pd|c7D!6U,
return currentPage; X 6>Pq
} <_NF
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/** x>t:&Y M
* @param currentPage Y A;S'dxY
* The currentPage to set. ;a68>5Lm*
*/ 4Q$\hO3b
publicvoid setCurrentPage(int currentPage){ F
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this.currentPage = currentPage; H}:apRb
} 3&}wfK]X
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/** ~2pctqMA
* @return >iq^Ts
* Returns the everyPage. RY*6TYX!
*/ I3SLR
publicint getEveryPage(){ gSP|;Gy
return everyPage; xbIxtZm
} 2lGq6Au:
}C)
/** s |qB;
* @param everyPage N &=,)d~M
* The everyPage to set. Gs-'
*/ \
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publicvoid setEveryPage(int everyPage){ j88H3bi0
this.everyPage = everyPage; 7)[4|I
} iX4/;2B=,
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/** )2\6Fy0S
* @return ~_R=2t{u_
* Returns the hasNextPage.
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*/ {4#'`Eejj
publicboolean getHasNextPage(){ T9u/|OP
return hasNextPage; B=9|g1e
} |vzGFfRI
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/** s7=]!7QGS!
* @param hasNextPage -FJ5N}R
* The hasNextPage to set. 65MR(+3
*/ {+Eq{8m`
publicvoid setHasNextPage(boolean hasNextPage){ NC0x!tJ#7
this.hasNextPage = hasNextPage; wJ+"JQY.J+
} TVKuvKH8U
5 J 0
/** [
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* @return *!Xhy87%Z)
* Returns the hasPrePage. 37{mhU
*/ \p.ku%{
publicboolean getHasPrePage(){ $NqT={!
return hasPrePage; MvObx'+
} ! k&<
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/** Nmp1[/{J
* @param hasPrePage r lW
* The hasPrePage to set. )V+;7j<"D
*/ >?I[dYzut
publicvoid setHasPrePage(boolean hasPrePage){ j5tA!o
this.hasPrePage = hasPrePage; 5&6S["lt
} kIM* K%L}
= eYrz@,
/** aA=qel
* @return Returns the totalPage. "]`!#5j^WP
* <1V!-D4xu
*/ y&B~UeB:q
publicint getTotalPage(){ Haiuf)a
return totalPage; #m|AQr|
} 6f0 WN
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/** %KRAcCa7
* @param totalPage Vhv<w
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* The totalPage to set. Z&YW9de@
*/ u|APx8?"o
publicvoid setTotalPage(int totalPage){ N}Z"$4
this.totalPage = totalPage; {B uh5U,
} )9J&M