Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 BiYxI{V FD
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 >@2<^&K`
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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 :<J7 g`f
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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
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分页支持类: #r'MfTr
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java代码: EQm{qc;
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package com.javaeye.common.util; U^dfNi@q
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import java.util.List; m+(Cl#+
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publicclass PaginationSupport { UGcmzwE
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publicfinalstaticint PAGESIZE = 30; _(N+z.
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privateint pageSize = PAGESIZE; (4YLUN&1O$
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privateList items; ?
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privateint totalCount; /WN YS
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privateint[] indexes = newint[0]; I C
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privateint startIndex = 0; y!FO
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public PaginationSupport(List items, int E%mEfj7
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totalCount){ W==~9
setPageSize(PAGESIZE); 2R/|/>T v
setTotalCount(totalCount); F1Z'tjj+
setItems(items); LF7-??'
setStartIndex(0); oZBD.s
} ^ij0<*ca9
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public PaginationSupport(List items, int K%z!#RyJ4
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totalCount, int startIndex){ Hyb(.hlZh
setPageSize(PAGESIZE); 2K}49*
setTotalCount(totalCount); w!f2~j~
setItems(items); &;@L]
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setStartIndex(startIndex); "jL>P)
} _Y; TS1u
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public PaginationSupport(List items, int zgb$@JC
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totalCount, int pageSize, int startIndex){ 'z$N{p40m
setPageSize(pageSize); 7+HK_wNi
setTotalCount(totalCount); $TIeeTB
setItems(items); v=llg ^
setStartIndex(startIndex); @v)Z>xv
} Gx C+lqH#
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publicList getItems(){ xM jn=\}
return items; @|
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} ~c)&9'
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publicvoid setItems(List items){ M$K%e
this.items = items; (`.# n3{
} h:4(Gm;
}*:3]
publicint getPageSize(){ j`_S%E% X
return pageSize; @A,8>0+
} sfXFh
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publicvoid setPageSize(int pageSize){ P $`1}
this.pageSize = pageSize; J^7m?mA
} Dz }i-tw+
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publicint getTotalCount(){ &N}"4
return totalCount; e9LX0=
} ~`
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publicvoid setTotalCount(int totalCount){ i2<z"v63
if(totalCount > 0){ u&zY>'}zm
this.totalCount = totalCount; 5 ^{~xOM5
int count = totalCount / *Soi
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pageSize; `O\>vn
if(totalCount % pageSize > 0) %-n)L
count++; Xh"9Bcjf
indexes = newint[count]; o#qdgZ
for(int i = 0; i < count; i++){ <F9-$_m
indexes = pageSize * x{R440"
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} DGvuo 8
}else{ 2
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this.totalCount = 0; qk& F>6<9*
} {hS!IOM
} Rpn<"LIoB:
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publicint[] getIndexes(){ ASXGM0t
return indexes; LHY7_"u#
} $?GggP d
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publicvoid setIndexes(int[] indexes){ h#0n2o #
this.indexes = indexes; ;$D,w
} iK}p#"si
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publicint getStartIndex(){ C*Q7@+&
return startIndex; JH?ohA
} !Rv ;~f/2
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publicvoid setStartIndex(int startIndex){ +5y^c|L0
if(totalCount <= 0) ";/]rwHa)
this.startIndex = 0; gPMR,TU
elseif(startIndex >= totalCount) 88?bUA3]
this.startIndex = indexes #0AyC.\
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[indexes.length - 1]; fJ}e
elseif(startIndex < 0) i c{I
this.startIndex = 0; :w8{BIUN)
else{ S
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this.startIndex = indexes m
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[startIndex / pageSize];
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} `EKf1U\FI
} +`>7cy%cZ
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publicint getNextIndex(){ ~ 5}t;
int nextIndex = getStartIndex() + W|<c[S
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pageSize; vQ<
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if(nextIndex >= totalCount) -ssb|r
return getStartIndex(); 'o&d!
else 6J;!p/C8E
return nextIndex; D`XXR}8V
} ;@;aeu
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publicint getPreviousIndex(){ jIKg* @
int previousIndex = getStartIndex() - S?v/diK ]J
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pageSize; <)d%c%f'`
if(previousIndex < 0) "~Fg-{jM%
return0; SK}jhm"y
else ~(GvjB/C8
return previousIndex; 67EGkW?hbt
} O?vh]o
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} qGX@mo({
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抽象业务类 uzp\V
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java代码: "dpjxH=xO
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/** e=LrgRy+
* Created on 2005-7-12 )?{<Tt@
*/ JpXv+V
package com.javaeye.common.business; 9d1km~
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import java.io.Serializable; QGNKQ`~
import java.util.List; CVO_F=;
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import org.hibernate.Criteria; ,!>
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import org.hibernate.HibernateException; 4Uny.C]
import org.hibernate.Session; Yo %U{/e
import org.hibernate.criterion.DetachedCriteria; 7~2_'YX>:
import org.hibernate.criterion.Projections; th{J;a
import S$b)X"h
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org.springframework.orm.hibernate3.HibernateCallback; bg~CV&]M
import hP:>!KJ
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org.springframework.orm.hibernate3.support.HibernateDaoS 2D!jVr!
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upport; ]v<8l4p;
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import com.javaeye.common.util.PaginationSupport; C2<TR PT
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public abstract class AbstractManager extends 7c_2.T@4
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HibernateDaoSupport { NFVu~t
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privateboolean cacheQueries = false; g:uVl;>
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privateString queryCacheRegion; !$n@:W/
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publicvoid setCacheQueries(boolean TqJ @l
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cacheQueries){ }wo:1v8J
this.cacheQueries = cacheQueries; 7fqQ
} <^nS%hXEr
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publicvoid setQueryCacheRegion(String w!UF^~
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queryCacheRegion){ SB%D%Zx6'%
this.queryCacheRegion = POk5+^
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queryCacheRegion; 4lPO*:/
} ln_&Ux+l
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publicvoid save(finalObject entity){ bEF2-FO
getHibernateTemplate().save(entity); Fepsa;\sU
} W9l](Ow
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publicvoid persist(finalObject entity){ pYcs4f!?p
getHibernateTemplate().save(entity); .?:#<=1
} Q>L(=j2t
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publicvoid update(finalObject entity){ hV $Zr4'
getHibernateTemplate().update(entity); ";dS~(~
} IS"[<
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publicvoid delete(finalObject entity){ ;):;H?WS|A
getHibernateTemplate().delete(entity); &wDZ@{h
} <e! TF@
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publicObject load(finalClass entity, >}wFePl
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finalSerializable id){ KsGW@Ho:
return getHibernateTemplate().load 9'(^Coq
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(entity, id); pcv\|)&}
}
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publicObject get(finalClass entity, .hckZx /
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finalSerializable id){ Z>UM gu3c
return getHibernateTemplate().get ;8=Bee4
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(entity, id); 3` IR
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} !hJ!ck]M
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publicList findAll(finalClass entity){ ;a|%W4 "
return getHibernateTemplate().find("from 0++RxYFCL
&@xm< A\S
" + entity.getName()); ?Xpk"N7
} j#3IF *"
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publicList findByNamedQuery(finalString fhn$~8[_A
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namedQuery){ }#tbK 2[
return getHibernateTemplate dB~A4pZa
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().findByNamedQuery(namedQuery); {|$kI`h,3-
} cRs\()W
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publicList findByNamedQuery(finalString query, fP
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finalObject parameter){ B4HMs$>
return getHibernateTemplate TP| ogF?
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().findByNamedQuery(query, parameter); @r<2]RXlc
} KtJc9dnX
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publicList findByNamedQuery(finalString query, CqWO 0
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finalObject[] parameters){ tSni[,4Kq
return getHibernateTemplate [c;0eFSi2
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().findByNamedQuery(query, parameters); cjtcEW
} > {d9z9O
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publicList find(finalString query){ ;TC]<N.YJT
return getHibernateTemplate().find [ Y{
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(query); P_H2[d&/>D
} ltrti.&
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publicList find(finalString query, finalObject Za?BpV~
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parameter){ `*0VN(gf'
return getHibernateTemplate().find UdcV<#
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(query, parameter); <}.!G>X
} 45BpZ~-
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public PaginationSupport findPageByCriteria {|0YcL
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(final DetachedCriteria detachedCriteria){ T+gH38!e
return findPageByCriteria XxeP;}
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); )b%zYD9p
} QxbG-B^)=
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public PaginationSupport findPageByCriteria toU<InN
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(final DetachedCriteria detachedCriteria, finalint v.sjWF
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startIndex){ O9<oq
return findPageByCriteria sSk qU
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(detachedCriteria, PaginationSupport.PAGESIZE, }Q9+krrow
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startIndex); eVX/<9>
} Rxr?T-
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public PaginationSupport findPageByCriteria 4Wvefq"
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(final DetachedCriteria detachedCriteria, finalint [_ uT+q3
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pageSize, "9X!Ewm"P
finalint startIndex){ 0dsL%G~/N
return(PaginationSupport) RH7!3ye
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getHibernateTemplate().execute(new HibernateCallback(){ lSoAw-@At8
publicObject doInHibernate hW~UJ/$
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(Session session)throws HibernateException { OXl0R{4
Criteria criteria = *aFh*-Sj2I
(["V( $
detachedCriteria.getExecutableCriteria(session); oO7)7$|1
int totalCount = SY:ISzB}
}Q\+w,pJgN
((Integer) criteria.setProjection(Projections.rowCount YUTh*`1k<
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()).uniqueResult()).intValue(); }G^'y8U
criteria.setProjection m$hkmD|
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(null); ?I+$KjE+
List items = 6Hy_7\$(-
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criteria.setFirstResult(startIndex).setMaxResults $Fi1Bv)
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(pageSize).list(); S{)K_x
PaginationSupport ps = <gFisc/#r
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new PaginationSupport(items, totalCount, pageSize, "&`>+Yw
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startIndex); 1`s^r+11:
return ps; 6Z=Qs=q
} e_l|32#/
}, true); 7hLh}
} >o3R~ [
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public List findAllByCriteria(final a3A3mBw
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DetachedCriteria detachedCriteria){ tv~Y5e&8
return(List) getHibernateTemplate u"wWekB
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().execute(new HibernateCallback(){ eR`Q7]j] -
publicObject doInHibernate CGb4C(%-7
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(Session session)throws HibernateException { &sYxe:H
Criteria criteria = SjF(;0kC
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detachedCriteria.getExecutableCriteria(session); <dVJV?i;
return criteria.list(); Wl+spWqW
} k=d0%}
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}, true); 'mm>E
} 1U^KN~!
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public int getCountByCriteria(final Ejf5M\o
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DetachedCriteria detachedCriteria){ `|v/qk7
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Integer count = (Integer) z;/8R7L&
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getHibernateTemplate().execute(new HibernateCallback(){ (c"!&&S^ =
publicObject doInHibernate q
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(Session session)throws HibernateException { }L%2K"8?}
Criteria criteria = ;n|%W,b-
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detachedCriteria.getExecutableCriteria(session); oSjYp(h:
return 0ZLLbEfnPB
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criteria.setProjection(Projections.rowCount ^K4?uABc
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()).uniqueResult(); C(8!("tU
} 1;B&R89}
}, true); m],.w M8
return count.intValue(); Bu?Qyz2O
} ,&fZo9J9
} i\DU<lD5VN
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用户在web层构造查询条件detachedCriteria,和可选的 3J/l>1[
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 GZn=Hgv8
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PaginationSupport的实例ps。 $A/?evJi8R
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ps.getItems()得到已分页好的结果集 4vvQ7e7
ps.getIndexes()得到分页索引的数组 R(8?9-w
ps.getTotalCount()得到总结果数 %XZhSmlf
ps.getStartIndex()当前分页索引 6R$Yh0%
ps.getNextIndex()下一页索引 o-AF_N
ps.getPreviousIndex()上一页索引 ]ZW-`U MO
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 yx*<c#Uf
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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 7&%HE\
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一下代码重构了。 \j BA4?(S
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我把原本我的做法也提供出来供大家讨论吧: :qj;f];|
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首先,为了实现分页查询,我封装了一个Page类: G-R83Orl
java代码: bu $u@:q 6
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/*Created on 2005-4-14*/ WiQVZ{
package org.flyware.util.page; o1*P|.`
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/** \DBEs02
* @author Joa L<B)BEE.
* ^Pu:&:ki
*/ W2zG"Q
publicclass Page { $;~YgOVZ5
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/** imply if the page has previous page */ =K|#5p`
privateboolean hasPrePage; C@zG(?X
N^PkSf[)h5
/** imply if the page has next page */ :O,r3O6
privateboolean hasNextPage; CF\wR;6k
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/** the number of every page */ jt9- v-
privateint everyPage; >ke.ZZV?
oR,zr
/** the total page number */ 5ug|crX
privateint totalPage; ;volBfv
}; M@JMu,
/** the number of current page */ rwio>4=
privateint currentPage; $/@
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/** the begin index of the records by the current `g)
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query */ H Vhd#Q;
privateint beginIndex; GRVF/hPn
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/** The default constructor */ G`Z<a
public Page(){ PlK3;
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} mO(Y>|mm
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/** construct the page by everyPage TA:uB[Ji
* @param everyPage +{m+aHk
* */ A=Hv}lv
public Page(int everyPage){ nt-_)4Fm
this.everyPage = everyPage; ~gOZ\jm}
} jt: *Y
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/** The whole constructor */ v}D0t]
public Page(boolean hasPrePage, boolean hasNextPage, ?9!9lSH6%
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int everyPage, int totalPage, KIR3m
)
int currentPage, int beginIndex){ Bg zq
this.hasPrePage = hasPrePage; "!7Hu7
this.hasNextPage = hasNextPage; i gjn9p&_
this.everyPage = everyPage; 'irwecd8
this.totalPage = totalPage; b`j9}tZ
this.currentPage = currentPage; :A:7^jrhi
this.beginIndex = beginIndex; A{k1MA<F6
} PApr8Xe
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/** !Fxn1Z,
* @return PYs0w6o
* Returns the beginIndex. A-_M=\
*/ T /IX(b'<
publicint getBeginIndex(){ K`uPPyv
return beginIndex; Nq\)o{<1
} `.3.n8V
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/** O;McPw<&\:
* @param beginIndex P?c V d2Y
* The beginIndex to set. ' S,g3
*/ gzH;`,
publicvoid setBeginIndex(int beginIndex){ * a1q M?
this.beginIndex = beginIndex; /YU8L
} 2Q@Jp`#,4
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/** J(maJuY
* @return y;4g>ma0
* Returns the currentPage. 3
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*/ HINk&)FC
publicint getCurrentPage(){ ]q[(z
return currentPage; 7bRfkKD
} l,(:~KH|
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/** k\*?<g
* @param currentPage nnE'zk<"
* The currentPage to set. V=5*)i/
*/ f\q5{#"z
publicvoid setCurrentPage(int currentPage){ I8B0@ZtV
this.currentPage = currentPage; G|-RscPe
}
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f#!nj]}#
/** X%JyC_~<
* @return ].aFdy
* Returns the everyPage. 0kls/^ 0,
*/ I*(kv7(c0
publicint getEveryPage(){ n_ ?+QF
return everyPage; yD.(j*bMK;
} Rbr:Q]zGN
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/** m^m=/'<+
* @param everyPage @p^EXc*|
* The everyPage to set. q
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*/ k{b|w')
publicvoid setEveryPage(int everyPage){ u ysTyzx
this.everyPage = everyPage; T"C.>G'[B
} ,)J>8eV
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/** +opym!\
* @return hJSWh5]
* Returns the hasNextPage. YDYNAOThnb
*/ )D'#>!Y
publicboolean getHasNextPage(){ be]/ROP>H
return hasNextPage; 3&{6+ A
} 'W54 T
F`(;@LO
/** "cly99t
* @param hasNextPage }aXS MxCd
* The hasNextPage to set. !v9`oL26
*/ $^czqA-&
publicvoid setHasNextPage(boolean hasNextPage){ ][V`ym-e
this.hasNextPage = hasNextPage; 0c!^=(
} "*l{ m2"
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/** KU0Ad);e
* @return q(hBqU W
* Returns the hasPrePage. 9kqR-T|Q
*/ fZsw+PSy
publicboolean getHasPrePage(){ vSoG] :1
return hasPrePage; N=T}
} xw_$1
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/** }2m>S6""A
* @param hasPrePage TqV^\C?
* The hasPrePage to set. $dK430_B
*/ 0]MD?6-
publicvoid setHasPrePage(boolean hasPrePage){ r)Zk- !1
this.hasPrePage = hasPrePage; ./0wt+
} AS~!YR
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/** h<$%y(lP
* @return Returns the totalPage. }0@@_Y]CC
* s?->2gxhx
*/ Y+vIU*O
publicint getTotalPage(){ +\&6Zbn
return totalPage; ~=[5X,Ta
} U#iW1jPE2
ed_+bCNy
/** l7VTuVGUJ
* @param totalPage q{b-2k
* The totalPage to set. Lr6C@pI
*/ c{?SFwgd
publicvoid setTotalPage(int totalPage){ ,C0y3pL
this.totalPage = totalPage; dhJ=+Fz"w
} #^9k&t#!6
3b_/QT5!
} 0CXXCa7!
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 3$5E1*ed
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个PageUtil,负责对Page对象进行构造: c VO-iPK
java代码: C|w<mryx
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/*Created on 2005-4-14*/ Ya!e83-r
package org.flyware.util.page; KiKw,@
whP5u/857
import org.apache.commons.logging.Log; aE3eYl9u
import org.apache.commons.logging.LogFactory; ]$^HGmP
ME]89 T&
/** mQ`2c:Rn&7
* @author Joa =e PX^J*M'
* N1.1
*/ Lz-|M?(
publicclass PageUtil { \*b
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privatestaticfinal Log logger = LogFactory.getLog !dh:jPpKq
Ct~j/.
(PageUtil.class); zOFHdd ,"g
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/** T9]0/>
* Use the origin page to create a new page xFM^-`7
* @param page GJ2ZK=/
* @param totalRecords /'_<~A
* @return (pP.*`JRv
*/ >b5 ;I1o=y
publicstatic Page createPage(Page page, int g"Ueo'd*
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totalRecords){ HJym|G>%?
return createPage(page.getEveryPage(), BtKor6ba
Hy,""Py
page.getCurrentPage(), totalRecords); h7TkMt[l
} UHU ,zgM
aot2F60J,
/** @V5i
* the basic page utils not including exception @H~oOf
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handler 9^?muP<A
* @param everyPage soQ[Zg4}
* @param currentPage O`GF|
* @param totalRecords j;z7T;!i
* @return page yJ0%6],^g
*/ B)L0hi
publicstatic Page createPage(int everyPage, int &y