Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Kz<xu ulr
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 c8'8DM
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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 g@U#Y#b@"
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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 `j(+Y
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分页支持类: _4W#6!
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java代码: T9$U./69-L
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package com.javaeye.common.util; "/"qg
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import java.util.List; 4ku /3/6
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publicclass PaginationSupport { %*gO<U4L]
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publicfinalstaticint PAGESIZE = 30; 68!]q(!6F
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privateint pageSize = PAGESIZE; |u+&xX7
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privateList items; U;nC)'~YW9
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privateint totalCount; NV gLq@F
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privateint[] indexes = newint[0]; t,+S~Cj|
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privateint startIndex = 0; s +GF-kJ*
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public PaginationSupport(List items, int ##5/%#eZ
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totalCount){ D=\|teA&
setPageSize(PAGESIZE); 6a@~;!GlI
setTotalCount(totalCount); ,,J3 h
setItems(items); C1/jA>XW
setStartIndex(0); n~ql]Ln
} VZ,T`8"
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public PaginationSupport(List items, int /'1y`j<
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totalCount, int startIndex){ /Ow?nWSt
setPageSize(PAGESIZE); k$c
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setTotalCount(totalCount); gctaarB&
setItems(items); }*'ha=`J
setStartIndex(startIndex); bxN;"{>Xz
} F[u%t34'
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public PaginationSupport(List items, int V9VP"kD
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totalCount, int pageSize, int startIndex){ 6:,^CI|@t
setPageSize(pageSize); 2{CSH_"Z7
setTotalCount(totalCount); 64lEB>VNm
setItems(items); W'jXIO
setStartIndex(startIndex); ETOc4hMO
} [!le 9aNg
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publicList getItems(){ sV<4^n7
return items; wb[(_@eZ
} k)s 7Ev*
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publicvoid setItems(List items){ /)1-^ju
this.items = items; TJpv"V
} K5>:WiY
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publicint getPageSize(){ Lm|X5RVq
return pageSize; S:YL<_oI|
} j 7URg>i0
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publicvoid setPageSize(int pageSize){ _);Kb/
this.pageSize = pageSize; ?~.&Y
} {wP|b@(1t
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publicint getTotalCount(){ Y+GeT#VHe
return totalCount; "o3"1s>d{
} .LhmYbQ2WE
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publicvoid setTotalCount(int totalCount){ >#?: x*[
if(totalCount > 0){ d*$<%J
this.totalCount = totalCount; L_mqC(vn
int count = totalCount / 5@$4.BGcF
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pageSize; 3(+#^aw
if(totalCount % pageSize > 0) ?vFh)U
count++; k_>{"Rc
indexes = newint[count]; !h!9SE
for(int i = 0; i < count; i++){ n*~
indexes = pageSize * ef&@aB
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} ap^=CEf
}else{ Q~JKKq
this.totalCount = 0; 6# ";W2
} 1omvE9
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} >UY_:cW4%m
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publicint[] getIndexes(){ |"qB2.[
return indexes; h)8+4?-4I
} AJfi,rFPg
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publicvoid setIndexes(int[] indexes){ k{jw%a<Sc
this.indexes = indexes; ^~qs-.?
} +[/47uFbI
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publicint getStartIndex(){ /dt!J
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return startIndex; L59oh
} *\KvcRMGUa
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publicvoid setStartIndex(int startIndex){ b0Ov+ )7#
if(totalCount <= 0) `?^w
this.startIndex = 0; rJZs
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elseif(startIndex >= totalCount) ZT8Ji?_n
this.startIndex = indexes Lzx$"R-
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[indexes.length - 1]; \t# 9zn>
elseif(startIndex < 0) G.nftp(*}
this.startIndex = 0; |.O!zRm
else{ h#>L:Wf5E
this.startIndex = indexes i i@1!o
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[startIndex / pageSize]; *}ee"eHs
} z-G7Y#
} 4c[)}8\
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publicint getNextIndex(){ ^>8]3@ Nh
int nextIndex = getStartIndex() + &17,]# 3
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pageSize; Xm:=jQn
if(nextIndex >= totalCount) eM=) >zl
return getStartIndex(); '0')6zW5s
else *rcuhw"^b#
return nextIndex; S"TMsi
} CKt|c!3 7
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publicint getPreviousIndex(){ /~l/_Jct@G
int previousIndex = getStartIndex() - DJYXC,r
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pageSize; =j+oKGkoCa
if(previousIndex < 0) Ge:-|*F
return0; 6~h1iY_~
else o1X/<.0+
return previousIndex; GGc_9?h
} "Dl9<EZ
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} 6!%d-Z7)
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抽象业务类 f:[d]J|
java代码: w}W@M,.^
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/** y|;8 :b32
* Created on 2005-7-12 ~26s7S}
*/ %rDmW?T
package com.javaeye.common.business; '+!S|U,{
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import java.io.Serializable; lii]4k+z
import java.util.List; A2|o=mOH
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import org.hibernate.Criteria; 7t-*L}~WA
import org.hibernate.HibernateException; _Hd1sx
import org.hibernate.Session; <a+eF}*2
import org.hibernate.criterion.DetachedCriteria; X}j'L&{F@
import org.hibernate.criterion.Projections; -[=AlqL
import
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org.springframework.orm.hibernate3.HibernateCallback; 9IvcKzS2
import %kZ~xbY
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org.springframework.orm.hibernate3.support.HibernateDaoS 85%Pq:E
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upport; otz_nF;E
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import com.javaeye.common.util.PaginationSupport; 2JA&{ch
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public abstract class AbstractManager extends 3j+=3n,
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HibernateDaoSupport { t ?9;cS4
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privateboolean cacheQueries = false; %on9C`/
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privateString queryCacheRegion; hnsa)@
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publicvoid setCacheQueries(boolean Tw`c6^%^y
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cacheQueries){ tB ,.
this.cacheQueries = cacheQueries; I(^jOgYU
} d4p{5F7]^
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publicvoid setQueryCacheRegion(String })zB".
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queryCacheRegion){ J-, H6u
this.queryCacheRegion = MdVCD^B
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queryCacheRegion; !bZhj3.
} 2H?I'<NoC
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publicvoid save(finalObject entity){ O^X[9vrW
getHibernateTemplate().save(entity); 'YZI>V*
} vZ[$H
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publicvoid persist(finalObject entity){ QN5yBa!Wz
getHibernateTemplate().save(entity); Q{qj
} `z-H]fU
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publicvoid update(finalObject entity){ *xX(!t'
getHibernateTemplate().update(entity); Jt-XmGULB
} [GR]!\!%~
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publicvoid delete(finalObject entity){ hl6,#2$
getHibernateTemplate().delete(entity); Y7*(_P3/
} y:g7'+c
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publicObject load(finalClass entity, ?418*tXd
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finalSerializable id){ i{tTUA
return getHibernateTemplate().load qJ{r!NJJ
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(entity, id); ^8?j~&u$F
} O+G~Qp0b>
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publicObject get(finalClass entity, 6keP':bt
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finalSerializable id){ N,j>;x3xT
return getHibernateTemplate().get s{(ehP.Dd
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(entity, id); c
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} .k# N7[q=
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publicList findAll(finalClass entity){ 6}VUD
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return getHibernateTemplate().find("from oupJJDpP
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" + entity.getName()); LPEjRG,
} T&9`?QD
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publicList findByNamedQuery(finalString P$p@5 hl
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namedQuery){ `pP9z;/Xq
return getHibernateTemplate -Wl)Lez@
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().findByNamedQuery(namedQuery); V/aQ*V{
} H|PrsGW
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publicList findByNamedQuery(finalString query, p>k]C:h
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finalObject parameter){ (bg}an
return getHibernateTemplate 7*zB*"B'1t
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().findByNamedQuery(query, parameter); f!5F]qP>-
} kx|me~I
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publicList findByNamedQuery(finalString query, wENzlXeOP
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finalObject[] parameters){ s{yJ:WncI
return getHibernateTemplate ^Vag1(hdq
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().findByNamedQuery(query, parameters); 60`+9(^
} 7<^'DOs
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publicList find(finalString query){ Y{,2X~ 7
return getHibernateTemplate().find ?V#Gx>\
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(query); i4 hJE
} YV*b~6{d
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publicList find(finalString query, finalObject ;5<P|:^
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parameter){ ows^W8-w
return getHibernateTemplate().find 6H0W`S0a
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(query, parameter); 3f_i1|>)'
} .FuA;:@%\
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public PaginationSupport findPageByCriteria CNut{4
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(final DetachedCriteria detachedCriteria){ F#6cF=};@
return findPageByCriteria DYX-5~;!
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Z,3 CC \
} ;vMn/
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public PaginationSupport findPageByCriteria 6A}eSG3
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(final DetachedCriteria detachedCriteria, finalint (/'h4KS@
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startIndex){ }xqXd%uz
return findPageByCriteria $)Wb#B
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(detachedCriteria, PaginationSupport.PAGESIZE, PJCnud F
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startIndex); PCtkjd
} kg:l:C)Tq
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public PaginationSupport findPageByCriteria 9GThyY
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(final DetachedCriteria detachedCriteria, finalint N3ZiGD
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pageSize, 8\DME
finalint startIndex){ w$b~x4y%
return(PaginationSupport) 0F^]A"kF
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getHibernateTemplate().execute(new HibernateCallback(){ 2\5cjdy
publicObject doInHibernate sW?B7o?
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(Session session)throws HibernateException { or7pJy%4"
Criteria criteria = va^0JfQ
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detachedCriteria.getExecutableCriteria(session); ZY)%U*jWU
int totalCount = Pw= 3PvkL
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((Integer) criteria.setProjection(Projections.rowCount b{BaQ>.(`
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()).uniqueResult()).intValue(); q@%h^9.
criteria.setProjection QhCY}Q?X
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(null); M\dO({o
List items = Q&gPa]z]}
)
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criteria.setFirstResult(startIndex).setMaxResults QNb>rLj52
dhW<p5
(pageSize).list(); ge$LIsE8
PaginationSupport ps = (`pNXQ0n
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new PaginationSupport(items, totalCount, pageSize, @89I#t6A.
) \4
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startIndex); jXWNHIl)@
return ps; pisB,wP$2
} -AC`q/bCD
}, true); 9^!wUwB
} x<s|vgl|
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public List findAllByCriteria(final n$YE !D'
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DetachedCriteria detachedCriteria){ F@1d%c
return(List) getHibernateTemplate lBmm(<~Z
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().execute(new HibernateCallback(){ 5U~OP
publicObject doInHibernate HlPG3LD!
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(Session session)throws HibernateException { @zrNN>
Criteria criteria = GmbIFOT~
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detachedCriteria.getExecutableCriteria(session); J\{$ot
return criteria.list(); ib]vX-
} (Xo SG
}, true); +0"x|$f~
} KmL$M
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public int getCountByCriteria(final #k9<
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DetachedCriteria detachedCriteria){ f ;wc{qy
Integer count = (Integer) xr.XU'
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getHibernateTemplate().execute(new HibernateCallback(){ qm'b'!gq~
publicObject doInHibernate sT`^ljp4
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(Session session)throws HibernateException { hiwIWd:H
Criteria criteria = Gs_qO)~xo
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detachedCriteria.getExecutableCriteria(session); 'gDe3@ci!
return DbtF~`3, .
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criteria.setProjection(Projections.rowCount s}ADk-7
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()).uniqueResult(); ue6d~8&
} VNj@5s
}, true); ]'k[u
return count.intValue(); ?'sXgo.}
} ru{f]|
} mM5|K@0|
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用户在web层构造查询条件detachedCriteria,和可选的 T4r5s
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ~+HoSXu@E
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PaginationSupport的实例ps。 Uo6(|mm
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ps.getItems()得到已分页好的结果集 J?%}=_fsa
ps.getIndexes()得到分页索引的数组 -=)-s m'
ps.getTotalCount()得到总结果数 q8sbn
ps.getStartIndex()当前分页索引 ,[`$JNc
ps.getNextIndex()下一页索引 *vnXlV4L
ps.getPreviousIndex()上一页索引 xmr|'}Pt[
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 i8~$o:&HT
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ~HmxEk9
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一下代码重构了。 -@M3Dwsi3
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我把原本我的做法也提供出来供大家讨论吧: GaBTj_3
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首先,为了实现分页查询,我封装了一个Page类: m xJXL":|
java代码: G {b:i8}l
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/*Created on 2005-4-14*/ ll<mE,
package org.flyware.util.page; |0
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/** |RhM| i
* @author Joa B:9.e?t
* f=`33m5
*/ SRL-Z&M
publicclass Page { vPmnN^
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/** imply if the page has previous page */ BU6Jyuwn
privateboolean hasPrePage; ^$Krub{|
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/** imply if the page has next page */ 3KcaT5(&
privateboolean hasNextPage; ]sj0~DI*m
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/** the number of every page */ Rj6|Y"gq9
privateint everyPage; HZZDv+
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/** the total page number */ #w>~u2W
privateint totalPage; 7[KCWJ
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/** the number of current page */ k^An97J
privateint currentPage; saW!9HQj
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/** the begin index of the records by the current t;47(U
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query */ ]ii+S"U3
privateint beginIndex; u) *Kws
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/** The default constructor */ ?CY1]d
public Page(){ x(~<