Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ?: yz/9(
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 A~2)ZdAN
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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 IWQ0I&tzdx
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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 sD:o
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分页支持类: D\AVZ76F1
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java代码: l1)~WqhE}
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package com.javaeye.common.util; V4n~Z+k
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import java.util.List; H#~gx_^U
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publicclass PaginationSupport { L"qJZU
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publicfinalstaticint PAGESIZE = 30; ; :P4~R
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privateint pageSize = PAGESIZE; 5#,H&ui\
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privateList items; 7k(}U_v
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privateint totalCount; Y%XF64)6
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privateint[] indexes = newint[0]; fF(2bVKP:
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privateint startIndex = 0; RbAl_xKI
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public PaginationSupport(List items, int %MeAa?G-#
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totalCount){ m/KaWrw/)
setPageSize(PAGESIZE); BNfj0e 5b
setTotalCount(totalCount); )`DVPudiy
setItems(items); HwUaaK
setStartIndex(0); yQ$irS?
} Mg;pNK\n
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public PaginationSupport(List items, int S6<o?X9,I
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totalCount, int startIndex){ u?=mh`
setPageSize(PAGESIZE); hdPGqJE
setTotalCount(totalCount); %Mda<3P
setItems(items); (S~kyU!)0
setStartIndex(startIndex); cx\E40WD
} r&{8/ 5"
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public PaginationSupport(List items, int @dWA1tM
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totalCount, int pageSize, int startIndex){ :_8K8Sa
setPageSize(pageSize); rNP;53FtZl
setTotalCount(totalCount); ZcN0:xU
setItems(items); n-Iz!;q
setStartIndex(startIndex); Kh]es,$D
} D+]mKPB
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publicList getItems(){ ]9oj,k
return items; -9b=-K.y
} 1bFZyD"
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publicvoid setItems(List items){ cNWmaCLN$
this.items = items; $*C
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} w2s`9
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publicint getPageSize(){ !j6k]BgZ
return pageSize; s41%A2Enh
} 9q`Ewj R
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publicvoid setPageSize(int pageSize){ e>MtDJ5
this.pageSize = pageSize; w
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} uw+nll*W%
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publicint getTotalCount(){ Xf4Q Lw/r
return totalCount; /!]K+6>u
} 7X$CJ%6b
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publicvoid setTotalCount(int totalCount){ '.v;/[0
if(totalCount > 0){
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this.totalCount = totalCount; 56pj(}eq
int count = totalCount / )I%M]K]F
+ ~V%R{h
pageSize; #Pd9i5~N
if(totalCount % pageSize > 0) ([8*Py|
count++; ,RPb<3
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indexes = newint[count]; f#s 6 'g
for(int i = 0; i < count; i++){ )z7CT|h7S
indexes = pageSize * `wi+/^);
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} b 8@}Jv
}else{ (%^C}`|EA
this.totalCount = 0; $.tT
} MHpGG00,
} [vu;B4^"
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publicint[] getIndexes(){ |j+JLB
return indexes; !zK"y[V
} E2zL-ft.
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publicvoid setIndexes(int[] indexes){ @WazSL;N
this.indexes = indexes; ug%7}&
} t]B`>SL3W
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publicint getStartIndex(){ 6nA9r5Ghv
return startIndex; o "r
} 3cJ'tRsp<
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publicvoid setStartIndex(int startIndex){ y>C
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if(totalCount <= 0) Y~Uf2(7b5
this.startIndex = 0; /
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elseif(startIndex >= totalCount) \4 b^*`d
this.startIndex = indexes ?8753{wk
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[indexes.length - 1]; v}!lx)#
elseif(startIndex < 0) 61_PSScSY
this.startIndex = 0; Ja1 `S+
else{ MgiW9@_(
this.startIndex = indexes CV[ 9i
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[startIndex / pageSize]; $}4ao2
} D?BegF
} rw)!>j+&A
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publicint getNextIndex(){ 1Ne;U/
int nextIndex = getStartIndex() + kiF}+,z"
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pageSize; W2<'b05
if(nextIndex >= totalCount) %0&,_jM/9
return getStartIndex(); 5]G%MB/|$
else U2`:'
return nextIndex; /K2[`+-
} U9BhtmY
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publicint getPreviousIndex(){ hGKQK
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int previousIndex = getStartIndex() - Wt%Wpb8
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pageSize; I?1BGaAA
if(previousIndex < 0) blomB2vQ
return0; ce$[H}rDB
else ea{zL
return previousIndex; %S%UMA.
} V1,p<>9
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} 2 6}3
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抽象业务类 _ow7E\70
java代码: \E c*Gq?.
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/** -V2f.QE%
* Created on 2005-7-12 bRggt6$z
*/ 0[H/>%3O
package com.javaeye.common.business; {*;K>%r\o
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import java.io.Serializable; }x|q*E\
import java.util.List; }S*]#jr&
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import org.hibernate.Criteria; 0OlT^
import org.hibernate.HibernateException; ]fDb|s48
import org.hibernate.Session; jjrE8[
import org.hibernate.criterion.DetachedCriteria; ;P'5RCqj
import org.hibernate.criterion.Projections; Y{~`g(~9_A
import <0Y<9+g!
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org.springframework.orm.hibernate3.HibernateCallback; ,5U[#6^
import k v_t6 (qd
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org.springframework.orm.hibernate3.support.HibernateDaoS M:.+^.h
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upport; x;SY80D
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import com.javaeye.common.util.PaginationSupport; 'JgCl'k,
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public abstract class AbstractManager extends s3sD7 @
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HibernateDaoSupport { w3VgGc~
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privateboolean cacheQueries = false; k{{
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privateString queryCacheRegion; r(>812^\
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publicvoid setCacheQueries(boolean o/&K>]8M
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cacheQueries){ Txl|F\nK`
this.cacheQueries = cacheQueries; ;Y8>?
} R@uA4Al
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publicvoid setQueryCacheRegion(String <l!:#u
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queryCacheRegion){ amExZ/
this.queryCacheRegion = Jza?DhSAZ
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queryCacheRegion; ]H{*Z3S
} O46v
@ G!Ir"Q
publicvoid save(finalObject entity){ }tBw<7fe
getHibernateTemplate().save(entity); V^!^wLLi
} -Ju;i<
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publicvoid persist(finalObject entity){ sZ7,7E|_
getHibernateTemplate().save(entity); XgXXBKf$
} hwvi tD!0
}(DH_0
publicvoid update(finalObject entity){ 1=T;6 8B
getHibernateTemplate().update(entity); LPs5LE[Pm
} 86cnEj=
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publicvoid delete(finalObject entity){ M/lC&F(
getHibernateTemplate().delete(entity); @+~>utr
} y$di_)&g
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publicObject load(finalClass entity, v:Gy>&
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finalSerializable id){ CAx
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return getHibernateTemplate().load !/a6;:_y
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(entity, id); -{C Gn5]_#
} ShlTMTgS
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publicObject get(finalClass entity, X!ldL|Ua%
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finalSerializable id){ G; exH$y
return getHibernateTemplate().get R
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(entity, id); *_J{_7pwe
} _<F;&(o
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publicList findAll(finalClass entity){ EbX!;z
return getHibernateTemplate().find("from j+dQI_']x
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" + entity.getName()); z Fj |E
} ZNDi;6e
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publicList findByNamedQuery(finalString }kItVx
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namedQuery){ K0B<9Wi|
return getHibernateTemplate Fv)E:PnKC
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().findByNamedQuery(namedQuery); O^6anUV0
} _!vy|,w@e
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publicList findByNamedQuery(finalString query, |N)),/R_
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finalObject parameter){ L AA(2
return getHibernateTemplate ]91QZ~4a
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().findByNamedQuery(query, parameter); .p o,.}
} &Ruq8n<
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publicList findByNamedQuery(finalString query, !J!&JQ|
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finalObject[] parameters){ n53c}^
return getHibernateTemplate /J!:_Nq
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().findByNamedQuery(query, parameters); QS\wtTXj
} P zM yUv
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publicList find(finalString query){ 9iM%kY#)W
return getHibernateTemplate().find S3WUccv
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(query); j`$$BVZ
} .L"IG=Uh#
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publicList find(finalString query, finalObject u3,O)[qV
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parameter){ HOCj* O4
return getHibernateTemplate().find L@zhbWY
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(query, parameter); L1DH9wiQi
} bX:h"6{=R
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public PaginationSupport findPageByCriteria ; Ad5Jk
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(final DetachedCriteria detachedCriteria){ Ks6\lpr
return findPageByCriteria nP*% N|0
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); I_->vC|>
} Z0-?;jA@
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public PaginationSupport findPageByCriteria <;~u@^>
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(final DetachedCriteria detachedCriteria, finalint t#t[cgI
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startIndex){ { %]imf|g.
return findPageByCriteria |KS,k|).
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(detachedCriteria, PaginationSupport.PAGESIZE, mb1c9
).(y#zJ7P
startIndex); *W^ZXhrZ
} GQCdB>
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public PaginationSupport findPageByCriteria |Nj6RB7
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(final DetachedCriteria detachedCriteria, finalint Vr( Z;YO
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pageSize, 2=0HQXXrq
finalint startIndex){ 'U`;4AN
return(PaginationSupport) w=rD8@
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getHibernateTemplate().execute(new HibernateCallback(){ vW vu&3tx
publicObject doInHibernate -]D/8,|s
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(Session session)throws HibernateException { 6W=V8
Criteria criteria = 7C3YVm6g
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detachedCriteria.getExecutableCriteria(session); :|n iFK4
int totalCount = | Rhqi
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((Integer) criteria.setProjection(Projections.rowCount i 61k
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()).uniqueResult()).intValue(); T:m"
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criteria.setProjection kC
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(null); uh2_Rzln
List items = 73Jm
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criteria.setFirstResult(startIndex).setMaxResults #+AQ:+
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(pageSize).list(); y*-_
PaginationSupport ps = lG94^|U
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new PaginationSupport(items, totalCount, pageSize, YE{t?Y\5
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startIndex); >,]8iMh
return ps; foQo`}"5
} (uDd_@a9t
}, true); vI5lp5( -3
} * zyik[o
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public List findAllByCriteria(final 6:Z8d%Z
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DetachedCriteria detachedCriteria){ 3Ioe#*5\
return(List) getHibernateTemplate =uAy/S
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().execute(new HibernateCallback(){ xHJkzI
publicObject doInHibernate zp1ym}9M
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(Session session)throws HibernateException { bG@2f"
Criteria criteria = tZKw(<am
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detachedCriteria.getExecutableCriteria(session); $Emu*'
return criteria.list(); N~mr@rXC
} uij^tN%
}, true); RLnL9)`W
} Im/tU6ybV
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public int getCountByCriteria(final %60 OS3
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DetachedCriteria detachedCriteria){ jj2\;b:a0
Integer count = (Integer) ;'uQBx}
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getHibernateTemplate().execute(new HibernateCallback(){ Hn(1_I%zF
publicObject doInHibernate AO|9H`6U6F
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(Session session)throws HibernateException { `**{a/3
Criteria criteria = <c pck
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detachedCriteria.getExecutableCriteria(session); K=v:qY4Z
return ?[NC}LC
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criteria.setProjection(Projections.rowCount `/P/2{,~
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()).uniqueResult(); j"69uj` R
} `<X-3)>;G
}, true); !sm/BsmL7T
return count.intValue(); J}X{8Ds9
} FHSoj=
} V<0iYi;4=
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用户在web层构造查询条件detachedCriteria,和可选的 D'#Q`H
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 <GNLDpj
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PaginationSupport的实例ps。 k5.5$<< T
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ps.getItems()得到已分页好的结果集 -y+>^45
ps.getIndexes()得到分页索引的数组 : OY~Q3
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ps.getTotalCount()得到总结果数 "+"=iwEAz
ps.getStartIndex()当前分页索引 +&`W\?.~
ps.getNextIndex()下一页索引 !=,4tg`
ps.getPreviousIndex()上一页索引 "S%t\
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 'kZ,:.v
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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 e yJ07
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一下代码重构了。 p?:5U[KM
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我把原本我的做法也提供出来供大家讨论吧: cqNK`3:.j
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首先,为了实现分页查询,我封装了一个Page类: c~Ka) dF|
java代码: w6%
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/*Created on 2005-4-14*/ I9*cEZ!l=e
package org.flyware.util.page; n~* ".ZC'Y
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/** 8-#%l~dr
* @author Joa $RPW/Lyiq
* }~XWtWbd-
*/ 'jtC#:ePK
publicclass Page { HgF;[rq3Q
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/** imply if the page has previous page */ f&^(f1WO
privateboolean hasPrePage; pIJXP$v3
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/** imply if the page has next page */ O<gfZ>
privateboolean hasNextPage; k&]nF,f
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/** the number of every page */ Ma[EgG
privateint everyPage; {3tzr ;c?
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/** the total page number */ /~[Lr
privateint totalPage; 6Xlzdt
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/** the number of current page */ W7i|uTM
privateint currentPage; t;&XIG~
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/** the begin index of the records by the current @w[i%F,&`
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query */ g{65 QP
privateint beginIndex; @X2*O9
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/** The default constructor */ $cCC
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public Page(){ V#t_gS
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} "ZuuSi
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/** construct the page by everyPage Bh>L"'.2
* @param everyPage d8j1L/e
* */ J-F".6i5
public Page(int everyPage){ G 6sK3K
this.everyPage = everyPage; f!Q\M1t)
} T~TP
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@
/** The whole constructor */ )O]T}eI
public Page(boolean hasPrePage, boolean hasNextPage, @;Ttdwg#J
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int everyPage, int totalPage, ^mS |ff
int currentPage, int beginIndex){ (q>
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this.hasPrePage = hasPrePage; yPm2??5MW>
this.hasNextPage = hasNextPage; /:&!o2&1H
this.everyPage = everyPage; D6sw"V#
this.totalPage = totalPage; k*.]*]
this.currentPage = currentPage; I2ek`t]
this.beginIndex = beginIndex; &|>+LP@8
} S&op|Z)1
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/** gV_/t+jI
* @return ^u/%zL
* Returns the beginIndex. a^|DD#5
*/ dhl[=Y`
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publicint getBeginIndex(){ BT$p~XB
return beginIndex; n/H
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} 0J)s2&H
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/** 1^p/#jt
* @param beginIndex iTVe8eI
* The beginIndex to set. I$n=>s
*/ d"$8-_K
publicvoid setBeginIndex(int beginIndex){ "n-'?W!
this.beginIndex = beginIndex; S;Bk/\2
} $Gn.G_"v
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/** TOYK'|lwM
* @return z3fv}_\z
* Returns the currentPage. bf3!|Um
*/ L"L3n,%F
publicint getCurrentPage(){ &J[a.:..
return currentPage; 8s%/5v"
} ^S9y7b^;r
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/** CUA @CZ6{
* @param currentPage }2A6W%^>]
* The currentPage to set. x%P|T3Qy5
*/ "(koR Q
publicvoid setCurrentPage(int currentPage){ Gn]36~)*H
this.currentPage = currentPage; .p`4>XA
} g8),$:Uw
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/** cH]tZ$E`
* @return dn6B43w
* Returns the everyPage. KWwtL"3
*/ W+XWS,(
publicint getEveryPage(){ 7\u+%i;YZ
return everyPage; zd?@xno
} J(
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@u3`lhUcT
/** ^6 6!f 5^W
* @param everyPage H^_,e= j
* The everyPage to set. N!A20Bv
*/ tiK?VwaKI
publicvoid setEveryPage(int everyPage){ s>rR\`
this.everyPage = everyPage; ejRK-!
} ajbe7#}
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/** )oEVafNsT
* @return gU9{~-9}
* Returns the hasNextPage. X@nBj;
*/ mgxIxusR
publicboolean getHasNextPage(){ T?9D?u?]
return hasNextPage; *P()&}JK
} NOz3_k
@0`A!5h?u
/** TFVQfj$r
* @param hasNextPage &}ZmT>q`$
* The hasNextPage to set. N,ht<