Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 . W ~&d_n
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 2'>
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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 BqoGHg4iq
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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 Y)V)g9
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分页支持类: 8.`*O
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java代码: t,D7X1W
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package com.javaeye.common.util; Y6+/_$N4|
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import java.util.List; msf%i !
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publicclass PaginationSupport { -l(G"]tRB
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publicfinalstaticint PAGESIZE = 30;
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privateint pageSize = PAGESIZE; }0okyGg>q
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privateList items; ^*g= 65!1
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privateint totalCount; IjaFNZZC!
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privateint[] indexes = newint[0]; NCX`-SLv
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privateint startIndex = 0; 3*8m!gq7s
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public PaginationSupport(List items, int c^F@9{I
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totalCount){ L9Z\|L5
setPageSize(PAGESIZE); u.yjk/jF
setTotalCount(totalCount); Pt=@U:
setItems(items); ~rfUqM]I
setStartIndex(0); 8"=E0(m
} qsG}A
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public PaginationSupport(List items, int *L{^em#b
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totalCount, int startIndex){ ZCAg)/
setPageSize(PAGESIZE); APUpqY
setTotalCount(totalCount); &iTTal.6
setItems(items); MhDPf]`
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setStartIndex(startIndex); n!?^:5=s
} ?910ki_
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public PaginationSupport(List items, int k*ZYT6Z?
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totalCount, int pageSize, int startIndex){ Q=u [j|0mc
setPageSize(pageSize);
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setTotalCount(totalCount); bbG!Fg=qQ?
setItems(items); :"Gd;~p.
setStartIndex(startIndex); 9i`MUE1Sh
} EUmbNV0u
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publicList getItems(){ D6fGr$(N%
return items; l\6.f_
} dTVh{~/
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publicvoid setItems(List items){ tSX,*cz
this.items = items; Z}`A'#!
} N"Cd{3
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publicint getPageSize(){ 5E!Wp[^
return pageSize; ?WBA:?=$58
} 9jJ:T$}
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publicvoid setPageSize(int pageSize){ {C'9?4&
this.pageSize = pageSize; H=@S+4_bK
} ;\54(x}|K
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publicint getTotalCount(){ 1Gp|_8
return totalCount; OV`#/QL
} w)<h$<tU
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publicvoid setTotalCount(int totalCount){ *?R<gWCF
if(totalCount > 0){ gE$@:j
this.totalCount = totalCount; ?{(Jy*
int count = totalCount / {SwvUWOf"
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pageSize; "vF7b|I
if(totalCount % pageSize > 0) @u1mC\G
count++; 8;fi1 "F;}
indexes = newint[count]; 1z-Q~m@@
for(int i = 0; i < count; i++){ IJ2>\bW_p
indexes = pageSize * oLc
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i; VI;)VJbq
} MuP&m{
}else{ 7NP
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this.totalCount = 0; V~4yS4
} Yg!xlrxA
} v0W/7?D
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publicint[] getIndexes(){ F(;95TB
return indexes; 8]A`WDO3
} 9~6~[z
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publicvoid setIndexes(int[] indexes){ ;oJCV"y6$
this.indexes = indexes; ^ jT1q_0
} T`K4n U#
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publicint getStartIndex(){ ct@i]}"`
return startIndex; ,_U3p ,
} i1-wzI
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publicvoid setStartIndex(int startIndex){ ]7
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if(totalCount <= 0) NSDls@m
this.startIndex = 0; $?dutbE
elseif(startIndex >= totalCount) MzCZj
this.startIndex = indexes XFrgnnt
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[indexes.length - 1]; +^V%D!.$@
elseif(startIndex < 0) nI<Ab_EB
this.startIndex = 0; |emZZj
else{ ]?n~?dD{]
this.startIndex = indexes z|WDqB%/I
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[startIndex / pageSize]; .>+jtp}
} f}?q
} A"no!AN
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publicint getNextIndex(){ dx[kG
int nextIndex = getStartIndex() + \"AzT{l!;
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pageSize; ;&U! g&
if(nextIndex >= totalCount) "|%'/p
return getStartIndex(); 07qL@![!
else W6L}T,epX
return nextIndex; [y1
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} [cvtF(,
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publicint getPreviousIndex(){ @DK;i_i
int previousIndex = getStartIndex() - 0OPpA Ll
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pageSize; #`b5kqQm
if(previousIndex < 0) 2kQa3Pan
return0; 8[mj*^P
else z! /
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return previousIndex; @Yy']!Ju
} oZ"93]3-
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} DTp|he
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抽象业务类 e+7x &-+
java代码: {Wh7>*p{3
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/** {ZrB,yK
* Created on 2005-7-12 n>
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*/ t}2$no?
package com.javaeye.common.business; 7(<z= F
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import java.io.Serializable; a~"<lzu|$
import java.util.List; 4.}J'3 .
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import org.hibernate.Criteria; KMZEUmY1R1
import org.hibernate.HibernateException; okv`v
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import org.hibernate.Session; bRb+3au_x
import org.hibernate.criterion.DetachedCriteria; O]N
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import org.hibernate.criterion.Projections; Rr3<ln
import GUqhm$6a
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org.springframework.orm.hibernate3.HibernateCallback; Bh*7uNM
import #I|jFn9
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org.springframework.orm.hibernate3.support.HibernateDaoS I]OVzM
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upport; b+qdl`Vd
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import com.javaeye.common.util.PaginationSupport; 35X4]
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public abstract class AbstractManager extends [r"`rBw
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HibernateDaoSupport { KW5u.phv
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privateboolean cacheQueries = false; 1=.+!Tg
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privateString queryCacheRegion; jQLiqi`
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publicvoid setCacheQueries(boolean />E:}1}{
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cacheQueries){ g0
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this.cacheQueries = cacheQueries; [#hoW"'Q9
} (@y te
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publicvoid setQueryCacheRegion(String 3vK,vu q
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queryCacheRegion){ ;[>g(W+
this.queryCacheRegion = hRWRXC9
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queryCacheRegion; :-Al}7
} \L@DDK|"`6
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publicvoid save(finalObject entity){ O3>m,v
getHibernateTemplate().save(entity); _~_E(rTn
} KnjowK
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publicvoid persist(finalObject entity){ }co*%F{1
getHibernateTemplate().save(entity); RN0=jo!58
} Z<,$XvL
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publicvoid update(finalObject entity){ [V-OYjPAx
getHibernateTemplate().update(entity); {zf)im[.
} |{G GATni
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publicvoid delete(finalObject entity){ jQc.@^#+x
getHibernateTemplate().delete(entity); _:Jra
} #& 5}
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publicObject load(finalClass entity, |VPJaiC~
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finalSerializable id){ =Hs[peO*
return getHibernateTemplate().load s/"?P/R
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(entity, id); ">pt,QV
} =gjq@N]lAW
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publicObject get(finalClass entity, J0eJRs
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finalSerializable id){ |dxcEjcY_
return getHibernateTemplate().get A&:i$`m,
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(entity, id); O0Vtvbj
} \~#$$Q-qtU
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publicList findAll(finalClass entity){ }bg_?o;X}
return getHibernateTemplate().find("from v,] &[`
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" + entity.getName()); A"`^Abrm
}
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publicList findByNamedQuery(finalString wf=
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namedQuery){ W_ =
return getHibernateTemplate WjrUns
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().findByNamedQuery(namedQuery); %bp8VR sY
} 7K|:
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publicList findByNamedQuery(finalString query, F;Lg
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finalObject parameter){ u6,NQ^4
return getHibernateTemplate Q--VZqn
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().findByNamedQuery(query, parameter); 6Wm`Vj(s
} z`^DQ8+\j
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publicList findByNamedQuery(finalString query, FHu
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finalObject[] parameters){ nS53mLU)
return getHibernateTemplate *,UD&N_)*6
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().findByNamedQuery(query, parameters); ,1s,G]%M
} I4%p?'i,C
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publicList find(finalString query){ }nQni?
return getHibernateTemplate().find mv,<#<-W
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(query); Zw)*+> +FV
} T.fmEl
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publicList find(finalString query, finalObject P?y3YxS
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parameter){ 7^fpbrj
return getHibernateTemplate().find lR^OS*v
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(query, parameter); Z=B6fu*
} fcuU,A
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public PaginationSupport findPageByCriteria Nvlfi8.
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(final DetachedCriteria detachedCriteria){ 6%p$C
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return findPageByCriteria T4O H,^J
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); g=*`6@_=
} QJcaOXyMS
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public PaginationSupport findPageByCriteria D*>EWlZ
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(final DetachedCriteria detachedCriteria, finalint MpV3.
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startIndex){ \WDL?(G<
return findPageByCriteria $Vi[195]2
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(detachedCriteria, PaginationSupport.PAGESIZE, J H%^FF2
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startIndex); -`iXAyr)m
} Y7vTseq
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public PaginationSupport findPageByCriteria P <$)v5f
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(final DetachedCriteria detachedCriteria, finalint Y:~A-_
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pageSize, !J5k?J&{=
finalint startIndex){ i/&?e+i
return(PaginationSupport) B@:c8}2.
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getHibernateTemplate().execute(new HibernateCallback(){ d 6$,iw@>^
publicObject doInHibernate 14[+PoF^A
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(Session session)throws HibernateException { }@6/sg
Criteria criteria = 2(-J9y|
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detachedCriteria.getExecutableCriteria(session); )JO#Z(
int totalCount = ArFsr
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((Integer) criteria.setProjection(Projections.rowCount m3apeIEi[
){AtV&{$
()).uniqueResult()).intValue(); ]x8_f6;D
criteria.setProjection F:PaVr3q
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(null); \m3'4#
List items = rjmKe*_1V
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criteria.setFirstResult(startIndex).setMaxResults @}#" o
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(pageSize).list(); bIFKP
PaginationSupport ps = K[wOK
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new PaginationSupport(items, totalCount, pageSize, ^i"C%8
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startIndex); yI&{8DCCw
return ps; \m.ap+dFa
} 6^W6As0
}, true); hEO#uAR^Z
} ]!u12^A{
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public List findAllByCriteria(final @%4MFc0`!
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DetachedCriteria detachedCriteria){ $jt UQ1
return(List) getHibernateTemplate ,BK6a'1J
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().execute(new HibernateCallback(){ ?;{fqeJz
publicObject doInHibernate @S/PB[%S
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(Session session)throws HibernateException { R^%uEP
Criteria criteria = *cjH]MQ0Ak
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detachedCriteria.getExecutableCriteria(session);
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return criteria.list(); OH.Re6Rr
} Bg^k~NX%
}, true);
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} kmJ{(y)w
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public int getCountByCriteria(final @W\y#5"B
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DetachedCriteria detachedCriteria){ kzA%.bP|
Integer count = (Integer) U'pm5Mc\q
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getHibernateTemplate().execute(new HibernateCallback(){ z3l=aAw8
publicObject doInHibernate &*G+-cF
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(Session session)throws HibernateException { jzuOs,:R
Criteria criteria = !J34yro+s
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detachedCriteria.getExecutableCriteria(session); TBfX1v|Z)
return O"otzla
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criteria.setProjection(Projections.rowCount V}1D1.@
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()).uniqueResult(); u3!aKXnv<
} ^y.e
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}, true); S.;>:Dd[K
return count.intValue(); A#s`!SNv
} x\=2D<@az
} gTI!b
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用户在web层构造查询条件detachedCriteria,和可选的 Evz;eobW/
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 )I80Nq
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PaginationSupport的实例ps。 Cdjh/+!f
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ps.getItems()得到已分页好的结果集 V?g@pnN"
ps.getIndexes()得到分页索引的数组 >Z#=<
ps.getTotalCount()得到总结果数 !6eXJ#~[E
ps.getStartIndex()当前分页索引 Luxo,Ve
ps.getNextIndex()下一页索引 U
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ps.getPreviousIndex()上一页索引 NO4V{}?a
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 sSLs%)e|:
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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 `{g8A P3
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一下代码重构了。 &a?&G'?
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我把原本我的做法也提供出来供大家讨论吧: CroI,=a&,
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首先,为了实现分页查询,我封装了一个Page类: d*26;5~\
java代码: M\wIpRD,
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/*Created on 2005-4-14*/ eSZS`(#!(
package org.flyware.util.page; bl|k6{A
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/** Si<9Oh
* @author Joa |H67ny&K^&
* [Rh[Z #6
*/ W~GbB:-
publicclass Page { 8?S32Gdu
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/** imply if the page has previous page */ V:h-K`~/
privateboolean hasPrePage; R9SJ;TsE
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/** imply if the page has next page */ t&UPU&tY
privateboolean hasNextPage; /#Y)nyE
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/** the number of every page */ 73/kyu-0%
privateint everyPage; Q)\7(n
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/** the total page number */ z`-?5-a]I
privateint totalPage; X{rw+!
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/** the number of current page */ vjG:
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privateint currentPage; Hz$l)g}U
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/** the begin index of the records by the current \F%5TRoC
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query */ @ViJJ\
privateint beginIndex; \oF79
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/** The default constructor */ hd~X c
public Page(){ v\*43RL
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} qr%9Sdvx
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/** construct the page by everyPage nAn/V u
* @param everyPage @Md%gEh;&
* */ H{'<v|I
public Page(int everyPage){ [B9'/:
this.everyPage = everyPage;
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} 0bxB@(NO
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/** The whole constructor */ .$+]N[-=
public Page(boolean hasPrePage, boolean hasNextPage, _Zya GDv
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int everyPage, int totalPage, <Vyv)#32o3
int currentPage, int beginIndex){ orn9;|8q
this.hasPrePage = hasPrePage; xwa5dtcng
this.hasNextPage = hasNextPage; )/H=m7}1h
this.everyPage = everyPage; mLU4R Q}5
this.totalPage = totalPage; @cPb*
this.currentPage = currentPage; f3e#.jan
this.beginIndex = beginIndex; ((A]FOIbO
} 8YC\Bw
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/** M:|Z3p K
* @return H8~<;6W
* Returns the beginIndex. $X_JUzb
*/ @-bX[}.
publicint getBeginIndex(){ ][-N<
return beginIndex; 7QP%Pny%
} x[7jm"Pz
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/** edhNQWn
* @param beginIndex `e]L.P_e?
* The beginIndex to set. +MPM^ m
*/ zVe@`gc
publicvoid setBeginIndex(int beginIndex){ W
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this.beginIndex = beginIndex; }l&Uh&B`
} 6>v`6
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/** pv&:N,p
* @return 3o%,8l,
* Returns the currentPage. YQOdwcLG
*/ J@Eqqyf"
publicint getCurrentPage(){ 98h,VuKVaB
return currentPage; />;1 }
} jq#_*&Eg]
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/** p+U}oC
* @param currentPage ZzLmsTtzIu
* The currentPage to set. Zh`lC1l'
*/ ~\`lbGJ7?
publicvoid setCurrentPage(int currentPage){ !s#25}9zX5
this.currentPage = currentPage; qd"1KzQWO
} Ar4E $\W
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/** AEx
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* @return S?n k9T+
* Returns the everyPage. }\}pSqW
*/ |n=m{JX \m
publicint getEveryPage(){ ![3#([>4>
return everyPage; xRYL{+
} t9SzZ2E
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/** `,d*>
* @param everyPage X=_pQ+j`^
* The everyPage to set. wEENN_w
*/ gO%#'Eb2
publicvoid setEveryPage(int everyPage){ ,ii*[{X?
this.everyPage = everyPage; 0F-X.Dq
} 1C\OL!@L
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/** !TY9\8JzV
* @return \UM9cAX`
* Returns the hasNextPage. ^]w!ow41
*/ y:(OZ%g
publicboolean getHasNextPage(){ ;vvO#3DWM
return hasNextPage; pC
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} k@U8K(:x
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/** LnIln[g:
* @param hasNextPage D"0:n.
* The hasNextPage to set. W)3?T&`
*/ N&7=
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publicvoid setHasNextPage(boolean hasNextPage){ bqp6cg\p
this.hasNextPage = hasNextPage; XJy~uks,
} zb.^ _A
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/** )&]gX
* @return ,/AwR?m
* Returns the hasPrePage. gRv5l3k
*/ #j
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publicboolean getHasPrePage(){ sS;6QkI"y
return hasPrePage; &Oc^LV$6
} ]|62l+
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/** ZC 7R f
* @param hasPrePage ~Q"3#4l
* The hasPrePage to set. ;q]Jm
*/ dfY(5Wc+f
publicvoid setHasPrePage(boolean hasPrePage){ GL$!JKWp
this.hasPrePage = hasPrePage; c7Sa|9*dR
} j78WPG
&v|Uy}h&%1
/** `v3WJ>Q!N?
* @return Returns the totalPage. H-A?F^#
* |D+"+w/
*/ d4KTwn5g
publicint getTotalPage(){ I Wcgh`8
return totalPage; OV3l)73?t
} v+uq
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/** D ]Q,~Y&'
* @param totalPage xY9#ouF
* The totalPage to set. Fb=(FQ2Y?
*/ q/U(j&8W{
publicvoid setTotalPage(int totalPage){ n&ZArJ
this.totalPage = totalPage; r(;oDdVc
} nVkx Q?2
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} C(zgBk
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F: %-x=q
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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 MuXp*s3[
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个PageUtil,负责对Page对象进行构造: FsQeyh>
java代码: {y)O?9q
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/*Created on 2005-4-14*/ #HFB*>
package org.flyware.util.page; p=%Vo@*]
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import org.apache.commons.logging.Log; y4*i
V;"
import org.apache.commons.logging.LogFactory; K"u-nroHW
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/** &
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* @author Joa
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* .nN=M>#/
*/ 4x7(50hp#
publicclass PageUtil { x`T
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privatestaticfinal Log logger = LogFactory.getLog Uytq,3Gj6
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(PageUtil.class); X`#,*HkK
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/** I5]=\k($
* Use the origin page to create a new page 1o"/5T:S[
* @param page |vW(;j6
* @param totalRecords .{+KKa $@G
* @return xz2U?)m;x
*/ 9V&}%
publicstatic Page createPage(Page page, int H$'|hUwds%
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totalRecords){ <Sds5 d
return createPage(page.getEveryPage(), +B(x:hzY9
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page.getCurrentPage(), totalRecords); wM.z/r\p
} g4b-~1[S
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/** fP3e{dVf
* the basic page utils not including exception PPoQNW
k=;>*:D%
handler ;:<z hO
* @param everyPage |;xm-AM4r
* @param currentPage A/5??3H
* @param totalRecords fM,!9}<
* @return page &\<!{Y<'
*/ MJ5Ymt a
publicstatic Page createPage(int everyPage, int FY;\1bt<<
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currentPage, int totalRecords){ Br/qOO:n$}
everyPage = getEveryPage(everyPage); 6oTWW@
currentPage = getCurrentPage(currentPage); {g8uMt\4
int beginIndex = getBeginIndex(everyPage, kk|7{83O
fP 1V1ao
currentPage); vTnrSNdSE
int totalPage = getTotalPage(everyPage, (Hk4~v6pqC
%
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totalRecords); '{]1!yMh
boolean hasNextPage = hasNextPage(currentPage, E/bIq}R6
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totalPage); &UzeNL"]
boolean hasPrePage = hasPrePage(currentPage); :`u?pc27Sm
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returnnew Page(hasPrePage, hasNextPage, ^gw htnI
everyPage, totalPage, [6 d~q]KH
currentPage, ^RL#(O
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beginIndex); ed3d 6/%HR
} ~ZrSoVP=
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privatestaticint getEveryPage(int everyPage){ k+-IuO
return everyPage == 0 ? 10 : everyPage; mCM7FFl I
} b1+6I_u.
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privatestaticint getCurrentPage(int currentPage){ &d,chb(
return currentPage == 0 ? 1 : currentPage; ~nit~;
}
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privatestaticint getBeginIndex(int everyPage, int #Z;6f{yWf
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currentPage){ 6yDj1PI
return(currentPage - 1) * everyPage; ,m4M39MWJ
} $'Pn(eZHGv
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privatestaticint getTotalPage(int everyPage, int kg,t[Jl
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totalRecords){ z+@CzHCN
int totalPage = 0; n oWjZ
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if(totalRecords % everyPage == 0) ZtzSG@f
totalPage = totalRecords / everyPage; 1zo0/<dk
else 3C:!\R
totalPage = totalRecords / everyPage + 1 ; ^3>Qf
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return totalPage; NxOiT#YH
} euxkw]`h6
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privatestaticboolean hasPrePage(int currentPage){ woSO4e/
return currentPage == 1 ? false : true; v %?y5w
} i4sd29v
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privatestaticboolean hasNextPage(int currentPage, @.rVg XE=!
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int totalPage){ j@w+>h
return currentPage == totalPage || totalPage == VV_Zrje
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0 ? false : true; wEQ7=Gyx
} M<Gr~RKmAn
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 v~l_6V}
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 /mdPYV
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做法如下: {z^6V\O5
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 WA'&