Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 j|'R$|
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ,8SWe
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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 |6B6?'
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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 g{DFS[h
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分页支持类: -^fzsBL.
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java代码: q,,j',8kq/
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package com.javaeye.common.util; tBl#o ^
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import java.util.List; tP]q4i
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publicclass PaginationSupport { <P pYl
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publicfinalstaticint PAGESIZE = 30; y*KC*/'"
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privateint pageSize = PAGESIZE; |F~88j{VN
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privateList items; {h^c
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privateint totalCount; ,Qo}J@e(
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privateint[] indexes = newint[0]; /d]~ly
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privateint startIndex = 0; KZi'v6
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public PaginationSupport(List items, int Gx;xj0-"
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totalCount){ n>T:2PQ3
setPageSize(PAGESIZE); cI3KB-lM#
setTotalCount(totalCount); e7's)C>/'
setItems(items); .S6ji~;r
setStartIndex(0); n\*JaY
} rV U:VL`2
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public PaginationSupport(List items, int #'c%
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totalCount, int startIndex){ @4&,
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setPageSize(PAGESIZE); Y^X:vI
setTotalCount(totalCount); p}f-c
setItems(items); 'FqEB]gu
setStartIndex(startIndex); BP:(IP!&
} C;%Y\S
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public PaginationSupport(List items, int (`F|nG=X
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totalCount, int pageSize, int startIndex){ ?'Oj=k"c7
setPageSize(pageSize); j;G[%gi6{
setTotalCount(totalCount); d<_NB]V&F
setItems(items); yT&x`3f"i
setStartIndex(startIndex); ^pN 5NwC5
} 7|K3WuLL
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publicList getItems(){ [u7 vY@
return items; CJm.K
} au,jAk
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publicvoid setItems(List items){ HLM;EZ
this.items = items; Q
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} YsZ{1W
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publicint getPageSize(){ W _J&M4
return pageSize; 0hFH^2%UY
} wZ$tJQO
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publicvoid setPageSize(int pageSize){ (1rJFl!
this.pageSize = pageSize; (*MNox?w
} Z(KmS(
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publicint getTotalCount(){ AfUZO^<
return totalCount; m"<4\;GK
} Q,D0kS P
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publicvoid setTotalCount(int totalCount){ kkT3wP
if(totalCount > 0){ U@#?T
this.totalCount = totalCount; zIP[R):3&U
int count = totalCount / stX'yya
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pageSize; I$+%~4
if(totalCount % pageSize > 0) D!X>O}
count++; nDyvX1]
indexes = newint[count]; /X@7ju;
for(int i = 0; i < count; i++){ 3b+7^0frY#
indexes = pageSize * ok%EqO
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} ?E%U|(S)=L
}else{ m~##q}LZ
this.totalCount = 0; =
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} +Y^-e.UO
} MhHr*!N"}
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publicint[] getIndexes(){ L& I`
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return indexes; fB _4f{E
} GEhdk]<a7
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publicvoid setIndexes(int[] indexes){ ,D:iQDG^
this.indexes = indexes; g!p+rq_f
} L.SDM z
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publicint getStartIndex(){ |}M~kJ)
return startIndex; 7J0 ^N7"o
} U#8\#jo
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publicvoid setStartIndex(int startIndex){ ;X+G6F'
if(totalCount <= 0) "g
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this.startIndex = 0; K.:6YXVs<
elseif(startIndex >= totalCount) bk/.<Rt
this.startIndex = indexes j'G"ZPw1
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[indexes.length - 1]; "
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elseif(startIndex < 0) hp?ad
this.startIndex = 0; 1joc<EI
else{ 38"8,k
this.startIndex = indexes Q.j-C}a
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[startIndex / pageSize]; 7yY1dR<Y
} +}Qv6s#
} /AK*aRU^
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publicint getNextIndex(){ ;y:#S^|?-z
int nextIndex = getStartIndex() + >xxXPvM<`
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pageSize; [VfLv.8w
if(nextIndex >= totalCount) 9`LU=Xv/
return getStartIndex(); !1ie:z>s
else t9KH|y
return nextIndex; Z&~k]R0y
} f)&`mqeE
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publicint getPreviousIndex(){ cHqvkN`
int previousIndex = getStartIndex() - UiGUaB mF*
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pageSize; ZaEBdBv
if(previousIndex < 0) &(z8GYBr
return0; ^L*VW
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else EvGU j$
return previousIndex; puf;"c6e'
} ZI#SYEF6
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} x| ~D(zo
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抽象业务类 .R<s<]
java代码: e+]YCp[(
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/** Z3u""oM/
* Created on 2005-7-12 E|8s2t
*/ _If@#WnoyA
package com.javaeye.common.business; 6):sO/es
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import java.io.Serializable; 5
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import java.util.List; JydQA_
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import org.hibernate.Criteria; 'nmYB:&!
import org.hibernate.HibernateException; b`;b}ug
import org.hibernate.Session; -mWw.SfEZ
import org.hibernate.criterion.DetachedCriteria; W4] 0qp`\
import org.hibernate.criterion.Projections; +kdU%Sm
import TF([yZO'
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org.springframework.orm.hibernate3.HibernateCallback; T_;G))q'
import 9N3oVHc?
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org.springframework.orm.hibernate3.support.HibernateDaoS "b+3 &i|
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upport; ~9{-I{=
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import com.javaeye.common.util.PaginationSupport; y&O_Jyg<
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public abstract class AbstractManager extends %y^Kw
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HibernateDaoSupport { YJtOdgG|q
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privateboolean cacheQueries = false; oqm{<g?2
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privateString queryCacheRegion; .q& ]wu
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publicvoid setCacheQueries(boolean P^{`d_[K%
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cacheQueries){ d T-O8
this.cacheQueries = cacheQueries; <a/ZOuBzZ
} -B++V
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publicvoid setQueryCacheRegion(String jzOMjz~:)
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queryCacheRegion){ +Y%I0.?&5
this.queryCacheRegion = j2&OYg
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queryCacheRegion; 9%hB
} @X / =.
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publicvoid save(finalObject entity){ orN2(:Ct7
getHibernateTemplate().save(entity); |D_n4#X7u
} Ra,on&OP`*
}jy7,+
publicvoid persist(finalObject entity){ PYRwcJ$b\d
getHibernateTemplate().save(entity); dodz|5o%
} ViC76aJ
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publicvoid update(finalObject entity){ PyJblW
getHibernateTemplate().update(entity); 6Yi,%#
} \>CBam8d
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publicvoid delete(finalObject entity){ cN(QTbyl6Q
getHibernateTemplate().delete(entity); $7ME a"a
} 7PPsEU:rf
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publicObject load(finalClass entity, 8XXTN@&,
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finalSerializable id){ Ts *'f
return getHibernateTemplate().load O4+w2'.,
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(entity, id); |[t=.dK%
} )"Yah
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publicObject get(finalClass entity, JC-yiORVr
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finalSerializable id){ {+59YO
return getHibernateTemplate().get )4O`%9=M&
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(entity, id); Pg}G4L?H;J
} )%W2XvG
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publicList findAll(finalClass entity){ O-m}P
return getHibernateTemplate().find("from t$Ji{t-
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" + entity.getName()); 2]KPW*V
} Xm+3`$<
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publicList findByNamedQuery(finalString 745PCC'FK
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namedQuery){ 9%veUvY
return getHibernateTemplate f;6d/?= ~
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().findByNamedQuery(namedQuery); 4&WzGnK
} En%o7^W++
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publicList findByNamedQuery(finalString query, ?XrTZ{5'
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finalObject parameter){ `{;&Qcg6m
return getHibernateTemplate b .@dUuKz-
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().findByNamedQuery(query, parameter); \Fjq|3`<l
} p
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publicList findByNamedQuery(finalString query, !I$RE?7eY
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finalObject[] parameters){ `84yGXLK
return getHibernateTemplate J?DyTs3Z
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().findByNamedQuery(query, parameters); W{2y*yqY
} w%na n=
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publicList find(finalString query){ s_$@N!
return getHibernateTemplate().find qN(;l&Q
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(query); an@Ue7
} '!GI:U+g
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publicList find(finalString query, finalObject }R(_^@]
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parameter){ b9jm=U
return getHibernateTemplate().find ^hJ,1{o
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(query, parameter); X[}%iEWzT
} > ^}z
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public PaginationSupport findPageByCriteria [sRQd;+
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(final DetachedCriteria detachedCriteria){ 9wzYDKN}
return findPageByCriteria irS62Xe
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 4B
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} mB`r6'#=
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public PaginationSupport findPageByCriteria lw{|~m5`
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(final DetachedCriteria detachedCriteria, finalint jrR~V* :k
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startIndex){ |ouk;r24V
return findPageByCriteria ?aui q
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(detachedCriteria, PaginationSupport.PAGESIZE, 7Fx8&Z
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startIndex); kaLRI|hC
} `y(3:##p
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public PaginationSupport findPageByCriteria DDEn63{
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(final DetachedCriteria detachedCriteria, finalint <|@9]>z
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pageSize, 9azPUf)
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finalint startIndex){ ]cD!~nJ
return(PaginationSupport) U+z&jdnhDR
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getHibernateTemplate().execute(new HibernateCallback(){ (~#9KA1A}
publicObject doInHibernate h?b{{
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(Session session)throws HibernateException { 0IZV4{
Criteria criteria = ]KmYPrCl0
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detachedCriteria.getExecutableCriteria(session); 7?4>'
int totalCount = c=5$bo]LI
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((Integer) criteria.setProjection(Projections.rowCount VC@o]t5
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()).uniqueResult()).intValue(); j'W)Nyw$[
criteria.setProjection rr*IIG&.5
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(null); Je/R'QP^8
List items = ci!c7 ,'c
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criteria.setFirstResult(startIndex).setMaxResults hE;
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(pageSize).list(); 5o,82Kti
PaginationSupport ps = 1@am'#<
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new PaginationSupport(items, totalCount, pageSize, FY'f{gD^
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startIndex); gG}<l ':
return ps; oyUf/Sl
} @'S-nn,sO
}, true); milU,!7J
} lHx$F?
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public List findAllByCriteria(final G B15
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DetachedCriteria detachedCriteria){ d+_qBp
return(List) getHibernateTemplate TY?Fs-
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().execute(new HibernateCallback(){ :S.0e
publicObject doInHibernate zEu*q7
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(Session session)throws HibernateException { v8LKv`I's
Criteria criteria = NJ|8##Z>
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detachedCriteria.getExecutableCriteria(session); SW bwD/SN
return criteria.list(); HH>]"mv
} E0GpoG5C
}, true); /Qbt
} =|H/[",gg
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public int getCountByCriteria(final R#oXQaBJ
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DetachedCriteria detachedCriteria){ gzeG5p
Integer count = (Integer) &7;W=uF
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getHibernateTemplate().execute(new HibernateCallback(){ 4PNl3N3,n
publicObject doInHibernate sI#K01;"
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(Session session)throws HibernateException { d<xBI,g
Criteria criteria = sq*sb dE
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detachedCriteria.getExecutableCriteria(session); k
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return z1s9[5
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criteria.setProjection(Projections.rowCount qL(Qmgd
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()).uniqueResult(); iB{O"l@w
} ZVViu4]?y
}, true); iGM-#{5
return count.intValue(); st~f}w@
} UDhW Y.`'~
} rT <=`9^{
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用户在web层构造查询条件detachedCriteria,和可选的 d-lC|5U%
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 cW%F%:b
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PaginationSupport的实例ps。 #X`j#"Ov2(
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ps.getItems()得到已分页好的结果集 UJ2Tj+
ps.getIndexes()得到分页索引的数组 /(5SJ(a
ps.getTotalCount()得到总结果数 :voQ#f=
ps.getStartIndex()当前分页索引 vQ$ FMKz7
ps.getNextIndex()下一页索引 C&D!TR!K
ps.getPreviousIndex()上一页索引 hVd%
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 /z.Y<xOc
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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 o+r?N5
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一下代码重构了。 oYG9i=lZ
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我把原本我的做法也提供出来供大家讨论吧: :<r.n
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首先,为了实现分页查询,我封装了一个Page类: Tu"bbc
java代码: KmG*`Es
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/*Created on 2005-4-14*/ '_N~PoV
package org.flyware.util.page; B4Ko,=pg
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/** d"`/P?nx
* @author Joa &mXJL3iN
* gi\2bzWkbX
*/ %
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publicclass Page { I]+xerVd
@-qS[bV
/** imply if the page has previous page */ +i HZ*
privateboolean hasPrePage; jeXP|;#Una
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/** imply if the page has next page */ t.Q}V5t{g
privateboolean hasNextPage; JcV'O)&
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/** the number of every page */ ;n]GHqzY_
privateint everyPage; *'[8FZ|dQ
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/** the total page number */ &.^(,pt
privateint totalPage; tQ~vLPi$
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/** the number of current page */ paCC'*bv
privateint currentPage; ^F\RM4|,
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/** the begin index of the records by the current Uao8#<CkvJ
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query */ m-T@Og
privateint beginIndex; u*}[fQ`aF
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/** The default constructor */ (dvsGYT|.
public Page(){ 0ndk=V
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} &k53*Wo
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/** construct the page by everyPage S:5vC{
* @param everyPage ({&