Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 2MapB*
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 D|`I"N[<
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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 =83FCq"
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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 "DniDA
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分页支持类: cy6lsJ"?
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java代码: HoIK^t~VT#
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package com.javaeye.common.util; ;MH<T6b
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import java.util.List; hrRkam !y
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publicclass PaginationSupport { t69C48}15
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publicfinalstaticint PAGESIZE = 30; ?IWLH-fkP
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privateint pageSize = PAGESIZE; m1mA:R\zM
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privateList items; 7vRFF@eq}
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privateint totalCount; !G0OD$
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privateint[] indexes = newint[0]; $i^#KZ}-WK
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privateint startIndex = 0; M:4N'#`
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public PaginationSupport(List items, int 1I{^]]qw
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totalCount){ z)Is:LhS
setPageSize(PAGESIZE); QR+{Yp
setTotalCount(totalCount); t=IpVl!
setItems(items); S8{S b>
setStartIndex(0); Aw38Tw
} bP4<q?FKcN
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public PaginationSupport(List items, int R*v~jR/
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totalCount, int startIndex){ `H:5D5]
setPageSize(PAGESIZE); _Py/,Ks.q
setTotalCount(totalCount); ?G48GxJ
setItems(items); Y0f"}A1
setStartIndex(startIndex); vUX(h.}8
} \
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public PaginationSupport(List items, int b*7:{FXg
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totalCount, int pageSize, int startIndex){ 4!%TY4bJ
setPageSize(pageSize); HR/"Nwr
setTotalCount(totalCount); "o=*f/M
setItems(items); A1mxM5N
setStartIndex(startIndex); )@X
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} X/5\L.g2
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publicList getItems(){
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return items; 5iG+O4n%
} Hq[vh7Lux
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publicvoid setItems(List items){ !OVTs3}
this.items = items; )<.BN
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} M:!Twz$
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publicint getPageSize(){ 'pJ46"D@m
return pageSize; qMk"i@"
} `qNhB\
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publicvoid setPageSize(int pageSize){ RY>BP[h
this.pageSize = pageSize; @+9x8*~S'
} _;;'/rs
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publicint getTotalCount(){ Slk__eC
return totalCount;
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} E5#Dn.!~
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publicvoid setTotalCount(int totalCount){ d:U2b"k=/u
if(totalCount > 0){ YPjjSi:#
this.totalCount = totalCount; C&&*6E5
int count = totalCount / "kE$2Kg
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pageSize; +}XFkH~
if(totalCount % pageSize > 0) Ddf7wszW
count++;
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indexes = newint[count]; .=j]PckJO
for(int i = 0; i < count; i++){ y%y F34
indexes = pageSize * JAjXhk<=
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} {HJzhIgCf
}else{ ( 1 L9K;
this.totalCount = 0; 4`x.d
} r[>=iim
}
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publicint[] getIndexes(){ D!K){E
return indexes; h)W?8XdM
} Fp)+>oT
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publicvoid setIndexes(int[] indexes){ BCw5.@HK*
this.indexes = indexes; sXD.*D
} -QUr|:SK:
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publicint getStartIndex(){ duCso M/
return startIndex; m+f?+c6
} M![aty@
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publicvoid setStartIndex(int startIndex){ g UfLw
if(totalCount <= 0) 7O_@b$Q
this.startIndex = 0; `
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elseif(startIndex >= totalCount) h";0i:
this.startIndex = indexes h
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[indexes.length - 1]; {,Y?+F
elseif(startIndex < 0) 2:31J4t-<
this.startIndex = 0; ]kJinXHW
else{ sH//*y
this.startIndex = indexes &rTOJ1)V}
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[startIndex / pageSize]; 0i76(2
} 7J
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} ^-s'Ad3
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publicint getNextIndex(){ U_/sY9gz(
int nextIndex = getStartIndex() + 7^{M:kYC!
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pageSize; o%!8t_1mR
if(nextIndex >= totalCount) 6ty>0
return getStartIndex(); Jj<UtD+
else QAp+LSm
return nextIndex; ?s4-2g
} 8"d0Su4r
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publicint getPreviousIndex(){ =%p%+F@RlW
int previousIndex = getStartIndex() - X[Lwx.Ly8
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pageSize; eR'Df"+
if(previousIndex < 0) nUAoPE
return0; $=7'Cm?
else %i7bkdcwk
return previousIndex; J!
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} '6^20rj
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} ;#3l&HRKH1
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抽象业务类 0JQ0lzk1
java代码: K#j<G]I( @
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/** ?\GILB,
* Created on 2005-7-12 hJqLH?Ri
*/ hXsd12
package com.javaeye.common.business; |N9::),<
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import java.io.Serializable; 0?)U?=>]p
import java.util.List; |5uvmK
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import org.hibernate.Criteria; jOJ$QT
import org.hibernate.HibernateException; E7A psi4]
import org.hibernate.Session; d(.e%[`
import org.hibernate.criterion.DetachedCriteria; % D]vKv~<
import org.hibernate.criterion.Projections; zTDB]z!A
import ?(9/V7HQ.5
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org.springframework.orm.hibernate3.HibernateCallback; _j$"fg
import 9H@I<`qGC
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org.springframework.orm.hibernate3.support.HibernateDaoS "<c^`#CWuO
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upport; "}_b,5lkGK
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import com.javaeye.common.util.PaginationSupport; {1RI!#[\
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public abstract class AbstractManager extends )E--E+j
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HibernateDaoSupport { Xb0$BAP
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privateboolean cacheQueries = false; hE|Z~5\Y,>
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privateString queryCacheRegion; {H]xA 3[]
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publicvoid setCacheQueries(boolean :n'$Txf
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cacheQueries){ 'H"wu
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this.cacheQueries = cacheQueries; P5u
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} dGxk
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publicvoid setQueryCacheRegion(String mR3)$!
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queryCacheRegion){ m3Mo2};?
this.queryCacheRegion = F`/-Q>Q
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queryCacheRegion; `Gct_6
} Lk?%B)z
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publicvoid save(finalObject entity){ qPh
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getHibernateTemplate().save(entity); A1b</2
} qJjXN+/D
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publicvoid persist(finalObject entity){ Yt]tRqrh;T
getHibernateTemplate().save(entity); W62 $ HI
} N_dHPa
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publicvoid update(finalObject entity){ r57&F`{
getHibernateTemplate().update(entity); 1&zvf4
} #BB,6E
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publicvoid delete(finalObject entity){ m:kXr^!D
getHibernateTemplate().delete(entity); YX A|1
} []i/\0C^
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publicObject load(finalClass entity, G`n|fuv
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finalSerializable id){ ]} D^?g^
return getHibernateTemplate().load KpHt(>NR
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(entity, id); =NHE_4/p
} #xUX1(
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publicObject get(finalClass entity, ChvSUaCS
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finalSerializable id){ yyp0GV.x
return getHibernateTemplate().get ?vmu,y
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(entity, id); }ufzlHD
} W<f-
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publicList findAll(finalClass entity){ &cZQ,o
return getHibernateTemplate().find("from ,;3bPjey
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" + entity.getName()); 2TFb!?/RQ
} #&V7CYJ
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publicList findByNamedQuery(finalString &zuPt5G|
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namedQuery){ #Hn<4g"AjM
return getHibernateTemplate o#"U8N%r
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().findByNamedQuery(namedQuery); L/ L#[
} l#%qF Db
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publicList findByNamedQuery(finalString query, :G.u{cw
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finalObject parameter){ b 7XTOB_HO
return getHibernateTemplate ;jgk53lo
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().findByNamedQuery(query, parameter); mu#IF'|b
} |`T$Iq
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publicList findByNamedQuery(finalString query, s3(mkdXv
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finalObject[] parameters){ *5|;eN
return getHibernateTemplate oI\Lepl*
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().findByNamedQuery(query, parameters); GHs,,J;
} {yo{@pdX>
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publicList find(finalString query){ m|')
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return getHibernateTemplate().find C VXz>oM
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(query); 9"W 3t]
} Yvi.l6JL
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publicList find(finalString query, finalObject JXx[e
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parameter){ w3n6md
return getHibernateTemplate().find `49: !M$i
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(query, parameter); Ci-CY/]s
} A#o ~nC<
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public PaginationSupport findPageByCriteria VQ R
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(final DetachedCriteria detachedCriteria){ x?"+Or.h
return findPageByCriteria &@v&5EXOw
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); yG'
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} <`Xt?K
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public PaginationSupport findPageByCriteria JT,[;
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(final DetachedCriteria detachedCriteria, finalint 9ZD>_a
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startIndex){ MJ\^i4
return findPageByCriteria euMJ c
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(detachedCriteria, PaginationSupport.PAGESIZE, 4)Bk:K
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startIndex); 5i0vli/L
} ]/#3 P
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public PaginationSupport findPageByCriteria `o4%UkBpM
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(final DetachedCriteria detachedCriteria, finalint DqJzsk'd3
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pageSize, qo*%S
finalint startIndex){ [mcER4]}
return(PaginationSupport) ;RW0Dn)Q
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getHibernateTemplate().execute(new HibernateCallback(){ Fa0NHX2:
publicObject doInHibernate 17E,Qnf
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(Session session)throws HibernateException { _'mK=`>u
Criteria criteria = EXbaijHQG
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detachedCriteria.getExecutableCriteria(session); 9Ro7xSeD
int totalCount = 9
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((Integer) criteria.setProjection(Projections.rowCount $=9g,39
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()).uniqueResult()).intValue(); :!QT ,
criteria.setProjection 5M&<tj/[a0
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(null); iw{rns
List items = BhzcimC)
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criteria.setFirstResult(startIndex).setMaxResults >^~W'etX|
9 gc0Ri[4m
(pageSize).list(); )i^S:2
PaginationSupport ps = adn2&7H
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new PaginationSupport(items, totalCount, pageSize, fzJ^`
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startIndex); "oT&KW
return ps; &?H`MCvt
} adtgNwg
}, true); %BwvA_T'Q
} M,vCAZ
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public List findAllByCriteria(final 7PbwCRg
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DetachedCriteria detachedCriteria){ $/kZKoF{f
return(List) getHibernateTemplate fyF8RTm{
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().execute(new HibernateCallback(){ r'<!wp@
publicObject doInHibernate ,UNnz&H+f
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(Session session)throws HibernateException { ++!'6!l
Criteria criteria = 0i>>CvAl}
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detachedCriteria.getExecutableCriteria(session); Tl
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return criteria.list(); FL[,?RU?2
} >aAsUL5W
}, true); \'6%Ld5km
} 9>6?tb"f*H
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public int getCountByCriteria(final aeE~[m
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DetachedCriteria detachedCriteria){ YJF|J2u
Integer count = (Integer) /^9=2~b
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getHibernateTemplate().execute(new HibernateCallback(){ ,R}9n@JI^Y
publicObject doInHibernate ncpNesB
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(Session session)throws HibernateException { sdBB(
Criteria criteria = 8^puC
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detachedCriteria.getExecutableCriteria(session); f&I5bPS7}
return }BWT21'-Y
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criteria.setProjection(Projections.rowCount ODxCD%L
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()).uniqueResult(); r8Z.}<j
} UmL Boy&*
}, true); eWr2UXv$
return count.intValue(); hO2W!68
} BU O8Z]
} "..I$R
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用户在web层构造查询条件detachedCriteria,和可选的 0*,]`A=
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 M7=|N:/_
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PaginationSupport的实例ps。 +t8#rT ^B
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ps.getItems()得到已分页好的结果集 n^Q-K}!T/
ps.getIndexes()得到分页索引的数组 6J <.i
ps.getTotalCount()得到总结果数 ZU;nXqjc
ps.getStartIndex()当前分页索引 tu^C<MV
ps.getNextIndex()下一页索引 G%>{Z?!B
ps.getPreviousIndex()上一页索引
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 C,B{7s0-
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 mZ g'
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一下代码重构了。 'u9y\vUy
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我把原本我的做法也提供出来供大家讨论吧: UlPhW~F)
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首先,为了实现分页查询,我封装了一个Page类: r`sG!
java代码: XHm6K1mGZ
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/*Created on 2005-4-14*/ 63VgQ
package org.flyware.util.page; IeAi '
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/** n2Y a'YF
* @author Joa y>c Yw!
* y
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*/ drJUfsxV
publicclass Page { usw(]CnH
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/** imply if the page has previous page */ TiKfIv
privateboolean hasPrePage; h#Z~x
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/** imply if the page has next page */ @[#)zO
privateboolean hasNextPage; t')%;N
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/** the number of every page */ \"9ysePI
privateint everyPage; CYdYa|
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/** the total page number */ Bqw/\Lxwlf
privateint totalPage; s14ot80)
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/** the number of current page */ YoSBS
privateint currentPage; X$=/H 6R5Z
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/** the begin index of the records by the current >+@EU)
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query */ &X,6v
privateint beginIndex; B;t{IYhq{
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/** The default constructor */ U%)*I~9
public Page(){ [j?<&