Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 e)i-$0L"
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 @s\}ER3
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 GF0Utp:Zf;
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ~\zIb/ #
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分页支持类: .o8pC
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java代码: (e3?--~b6
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package com.javaeye.common.util; {Hw$`wL
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import java.util.List; *C> N
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publicclass PaginationSupport { `?T8NK
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publicfinalstaticint PAGESIZE = 30; zf^@f%R
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privateint pageSize = PAGESIZE; ~SEIIq
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privateList items; S7CD#Y[s
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privateint totalCount; 1EHNg<J(
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privateint[] indexes = newint[0]; _3gF~qr
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privateint startIndex = 0; y{nX 6
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public PaginationSupport(List items, int {dV!sQD
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totalCount){ M5S<N_+Pe
setPageSize(PAGESIZE); ?QzN\fY;
setTotalCount(totalCount); ~ o5h}OU"
setItems(items); `]<~lf
setStartIndex(0); =}W)%Hldr.
} ralU9MN.
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public PaginationSupport(List items, int \0l"9
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totalCount, int startIndex){ zrur-i$N+
setPageSize(PAGESIZE); n\YWWW[wf
setTotalCount(totalCount); JI92Dc*o
setItems(items); McU]U9:z
setStartIndex(startIndex); 8V:yOq10
} 0y#TGM|0D
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public PaginationSupport(List items, int H, O_l%
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totalCount, int pageSize, int startIndex){ v=+> ids
setPageSize(pageSize); YZp]vlm~
setTotalCount(totalCount); \JZ'^P$Q
setItems(items); [m]O^Hp{{
setStartIndex(startIndex); [zl"G^z
} PPNZ(j
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publicList getItems(){ 71Mk!E=1
return items; C6,W7M[c
} lb #`f,r>
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publicvoid setItems(List items){ D5
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this.items = items; %C*h/AW)'
} 9{{CNy
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publicint getPageSize(){ .{k^
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return pageSize; Xdc>Z\0V
} 3 jay V
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publicvoid setPageSize(int pageSize){ `LVX|l62
this.pageSize = pageSize; FYeUz$/
}
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publicint getTotalCount(){ 1He'\/#
return totalCount; RIxGwMi%
} @Tf5YZ*
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publicvoid setTotalCount(int totalCount){ {2%@I~US
if(totalCount > 0){ _{'HY+M
this.totalCount = totalCount; G( y@Tor+
int count = totalCount / ?gOZY\[ma
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pageSize; 2qUC@d<K
if(totalCount % pageSize > 0) >=U n=Q%
count++; g\
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indexes = newint[count]; Z(-@8=0
for(int i = 0; i < count; i++){ HzF]hm,
indexes = pageSize * tr\}lfK%
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} fdTyY ;
}else{ t5pf4M7
this.totalCount = 0; cLe659 &
} kVe_2oQ_>
} uia-w^F e
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publicint[] getIndexes(){ n,NKJt
return indexes; *.0#cP7 "
} c~+l|r=u?
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publicvoid setIndexes(int[] indexes){ bI~(<-S~K
this.indexes = indexes; i<nUp1r(
} @[4 Tdf
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publicint getStartIndex(){ g&"__~dS-F
return startIndex; C/Dc1sj
} 9*}?0J8
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publicvoid setStartIndex(int startIndex){ \[w82%U
if(totalCount <= 0) !jxz2Q
this.startIndex = 0; {!hA^[}|
elseif(startIndex >= totalCount) Jm8#M z
this.startIndex = indexes D0=H&Z[
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[indexes.length - 1]; u;*Wc9>sU
elseif(startIndex < 0) &Rx-zp&dJ
this.startIndex = 0; fu 95-)M
else{ 0@ 9em~
this.startIndex = indexes 64OgE!
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[startIndex / pageSize]; k%Q>lf<e
} 'WG%O7s.
} [/ E_v gZ
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publicint getNextIndex(){ Yg6 f
int nextIndex = getStartIndex() + g2WDa'{L
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pageSize; ggUJ -M'2h
if(nextIndex >= totalCount) VL/%D*
return getStartIndex(); 0g@
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else c91rc>
return nextIndex; 5M2G ;o
} :8bz+3p
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publicint getPreviousIndex(){ tc@([XqH
int previousIndex = getStartIndex() - AtN=G"c>_
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pageSize; <tbsQ3
if(previousIndex < 0) *@r)3
return0; 5h^U ]Y#
else MNKB4C8>
return previousIndex; KS/1ux4x
} -$4#eG%3
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} "1H?1"w~
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抽象业务类 E,nC}f
java代码: i!30f^9D-S
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/** ruLi
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* Created on 2005-7-12 sSC yjS'T
*/ c"3 a,&
package com.javaeye.common.business; ui,#AZQ#{4
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import java.io.Serializable; Kd _tjWS
import java.util.List; {<a(1#{
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import org.hibernate.Criteria; vb-L "S?kC
import org.hibernate.HibernateException; /u
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import org.hibernate.Session; |:s4#3
import org.hibernate.criterion.DetachedCriteria; A`4j=OF\
import org.hibernate.criterion.Projections; :mU,g|~55
import 9i8D_[
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org.springframework.orm.hibernate3.HibernateCallback; +1H.5|
import \5$N>
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org.springframework.orm.hibernate3.support.HibernateDaoS ,o}!pQ
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upport; -bK# &o,
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import com.javaeye.common.util.PaginationSupport; Q9N=yz
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public abstract class AbstractManager extends h5G>FPM-=
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HibernateDaoSupport { CE>RAerY
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privateboolean cacheQueries = false; t+k"$zR
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privateString queryCacheRegion; }*m:zD@8$
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publicvoid setCacheQueries(boolean xNTO59Y-s
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cacheQueries){ 2+Z2`k]AC
this.cacheQueries = cacheQueries; iKa}@U
} t nz
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publicvoid setQueryCacheRegion(String ,qak_bP
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queryCacheRegion){ d{@X-4k:
this.queryCacheRegion = YBN.
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queryCacheRegion; . \*Z:
} dZm>LVjG
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publicvoid save(finalObject entity){ HHD4#XcU
getHibernateTemplate().save(entity); P@:#NU[
} +I#5?
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publicvoid persist(finalObject entity){ 2 As 4}
getHibernateTemplate().save(entity); W|3XD-v@
} qtTys gv
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publicvoid update(finalObject entity){ Z.$ncP0s
getHibernateTemplate().update(entity);
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} 2i#wJ8vrF
}`4o+
publicvoid delete(finalObject entity){ o|Obl@CSBD
getHibernateTemplate().delete(entity); mCe,(/>l+
} )'xTDi
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publicObject load(finalClass entity, K IiV z<
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finalSerializable id){ i)P.Omr
return getHibernateTemplate().load )+Wx!c,mb
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(entity, id); A0yRA+
} }%[TJ@R;
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publicObject get(finalClass entity, m1=3@>
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finalSerializable id){ <0vQHND,3
return getHibernateTemplate().get `f}c 1
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(entity, id); q(e&{pbM)
} ZrnZ7,!@
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publicList findAll(finalClass entity){ ?7^H1L
return getHibernateTemplate().find("from Q2PY(
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" + entity.getName()); Ooz+V;#Q
} }8p;w T!
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publicList findByNamedQuery(finalString (1fE^KF@f
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namedQuery){ (1%u`#5n-N
return getHibernateTemplate /sH3Rk.>
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().findByNamedQuery(namedQuery); ~N;.hU%l
} TS)p2#
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publicList findByNamedQuery(finalString query, ^Qrdh0j
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finalObject parameter){ x
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return getHibernateTemplate eP|:b &
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().findByNamedQuery(query, parameter); ouK&H|'
} bT*MJ7VVm
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publicList findByNamedQuery(finalString query, +?[TH?2c+
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finalObject[] parameters){ QS,IM>Nr
return getHibernateTemplate \CM(
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().findByNamedQuery(query, parameters); `#A&v
} j./3 )
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publicList find(finalString query){ X{o.mN
return getHibernateTemplate().find `{CaJ6.
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(query); BHOxwW{
} YQ
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publicList find(finalString query, finalObject "X g@X5BG
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parameter){ Hu|NS {Ke-
return getHibernateTemplate().find R{\vOw:*
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(query, parameter); !`hjvJryw
} E:T<mI?d
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public PaginationSupport findPageByCriteria 9kuL1tcY
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(final DetachedCriteria detachedCriteria){ u^|XQWR$:
return findPageByCriteria @>B#2t&
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); /$'tO3
} (]^9>3{|
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public PaginationSupport findPageByCriteria FF6[qSV
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(final DetachedCriteria detachedCriteria, finalint wo$9$~(
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startIndex){ a[]=*(AZI
return findPageByCriteria <s2IC_f<+
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(detachedCriteria, PaginationSupport.PAGESIZE, O9oYuC :q
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startIndex); RlyF#X#7{
} ZwB<
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public PaginationSupport findPageByCriteria 3bu VU&ap
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(final DetachedCriteria detachedCriteria, finalint Yw"o_
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pageSize, @X?DHLM
finalint startIndex){ OGh9^,v
return(PaginationSupport) eZIqyw
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getHibernateTemplate().execute(new HibernateCallback(){ "yXKu)_
publicObject doInHibernate ^](sCE7
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(Session session)throws HibernateException { d^mw&F)S
Criteria criteria = CO%7^}xSE,
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detachedCriteria.getExecutableCriteria(session); T=(/n=
int totalCount = UX;?~X
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((Integer) criteria.setProjection(Projections.rowCount $[T^S
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()).uniqueResult()).intValue(); %/"I.\%d
criteria.setProjection 9cp-Rw<tI
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(null); Xt^ldW
List items = c [sydl
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criteria.setFirstResult(startIndex).setMaxResults t, #7F$t
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(pageSize).list(); Zy|B~.@<j
PaginationSupport ps = D+P(
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new PaginationSupport(items, totalCount, pageSize, x2=Bu#Y
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startIndex); P}29wr IZ
return ps; bGOOC?[UX
} /W1!mih
}, true); t6m3lq{
} ?1*Ka
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public List findAllByCriteria(final y^zII5|s
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DetachedCriteria detachedCriteria){ h:-ZXIv?
return(List) getHibernateTemplate
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().execute(new HibernateCallback(){ 1fm4:xHH
publicObject doInHibernate r/}q=J.
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(Session session)throws HibernateException { <K;
Criteria criteria = *`Swv`
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detachedCriteria.getExecutableCriteria(session); :7UC=GKQk
return criteria.list(); \@;$xdA$
} 45. -P
}, true); v_mk{
}
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public int getCountByCriteria(final +wc8rE6+W
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DetachedCriteria detachedCriteria){ mivb}cKM
Integer count = (Integer) rV84?75(Y
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getHibernateTemplate().execute(new HibernateCallback(){ |0ATH`{
publicObject doInHibernate "5
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(Session session)throws HibernateException { ,`PC^`0c}o
Criteria criteria = 3.+TM]RYN
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detachedCriteria.getExecutableCriteria(session); 5{Q5?M]
return IR;l{q&`
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criteria.setProjection(Projections.rowCount Rd'P\
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()).uniqueResult(); :No`+X[Kq
} 2(LF @xb
}, true); K+MSjQS"
return count.intValue(); r5 tn'
} -fpe
} H3-(.l[!b)
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用户在web层构造查询条件detachedCriteria,和可选的 !q\MXS($#u
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 p3r("\Za,
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PaginationSupport的实例ps。 >[}lC7 z,
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ps.getItems()得到已分页好的结果集 `#HtVI
ps.getIndexes()得到分页索引的数组 +t*V7nW
ps.getTotalCount()得到总结果数 j9gn7LS
ps.getStartIndex()当前分页索引 4`yE'%6.}
ps.getNextIndex()下一页索引 mi[t1cN)=
ps.getPreviousIndex()上一页索引 OT0%p)
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 M~%P1@%
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 88Nx/:#Y*
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一下代码重构了。 5aj%<r
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我把原本我的做法也提供出来供大家讨论吧: [|".j#ZlK
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首先,为了实现分页查询,我封装了一个Page类: U!d|5W.{Q
java代码:
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/*Created on 2005-4-14*/ 8[b_E5!V
package org.flyware.util.page; ES-V'[+jDy
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/** K|pg'VT"
* @author Joa I(<9e"1O
* Az7
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*/ :@uIEvD?
publicclass Page { (1EtC{
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/** imply if the page has previous page */ KH$|wv
privateboolean hasPrePage; s&hJ[$i
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/** imply if the page has next page */ }7non
privateboolean hasNextPage; b5Q|$E
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/** the number of every page */ GYZP?E p*
privateint everyPage; f=k_U[b4>
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/** the total page number */ Hf/ZaBn
privateint totalPage; gY'-C
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/** the number of current page */ +m9ouF
privateint currentPage; }!Y=SP1e
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/** the begin index of the records by the current e Fh7#~m
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query */ 3v@h&7<E
privateint beginIndex; SJB^dI**/d
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/** The default constructor */ HYg! <y
public Page(){ h1t~hrq
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} 2HUw^ *3
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/** construct the page by everyPage 8.,d`~
* @param everyPage P_4E<"eK
* */ @Jx1n Q^
public Page(int everyPage){ IRGcE&m
this.everyPage = everyPage; h ;@c%Vm
} qnCjNN
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/** The whole constructor */ \TZSn1isZX
public Page(boolean hasPrePage, boolean hasNextPage, e)= "Fq!
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int everyPage, int totalPage, b'``0OB )
int currentPage, int beginIndex){ lA%FS]vh
this.hasPrePage = hasPrePage; |
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this.hasNextPage = hasNextPage; k#bG&BF
this.everyPage = everyPage; FDFwx|
this.totalPage = totalPage; <UF0Xc&X'
this.currentPage = currentPage; iC3C~?,7
this.beginIndex = beginIndex; |Fz ^(US
} o$eo\X?J?
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/** Q 0G5<:wc
* @return gu6%$z
* Returns the beginIndex. p}3` "L=
*/ ue^HhZ9
publicint getBeginIndex(){ GE`1j'^-
return beginIndex; &|j0GP&
} CT5s`v!s
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/** 2}=@n*8*d
* @param beginIndex C1'y6{,@
* The beginIndex to set. {,i-V57-h
*/ l$1NI#&
publicvoid setBeginIndex(int beginIndex){ m.p$f$A_
this.beginIndex = beginIndex; C6EGM/m8
} C{,^4Eh3r
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/** XUzOt_L5<
* @return p^|6 /b
* Returns the currentPage. wZZ~!"O&
*/ N8pV[\f
publicint getCurrentPage(){ ,f{w@Er
return currentPage; HMC-^4\%[
} =n5n
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/** #|4G,!
* @param currentPage T60pw
* The currentPage to set. jz`3xFy *]
*/ 7Q]c=i cg
publicvoid setCurrentPage(int currentPage){
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this.currentPage = currentPage; iGSA$U P|
} Y/6>OD
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/** ~|9VVeE
* @return zz[fkH3
* Returns the everyPage. B2oKvgw
*/ 'da
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publicint getEveryPage(){ O!%T<2i3
return everyPage; rf-yUH]&S
} #M{qMJHDo
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/** gyD ;kn\CP
* @param everyPage i(pHJP:a:
* The everyPage to set. 2,dWD<h
*/ T\n6^@.>
publicvoid setEveryPage(int everyPage){ D
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this.everyPage = everyPage; /2zan}
} Pw| h`[h
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/** l 9
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* @return yhYF "~CM
* Returns the hasNextPage. PcEE`.
*/ Yb-{+H8{J
publicboolean getHasNextPage(){ zPND$3&'
return hasNextPage; [nZIV
} -&sY