Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 F)gL=6h
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 R=e`QMq
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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 [;?^DAnK2
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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 Z(<ul<?r
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分页支持类: TuF:m"4
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java代码: mD=?C
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package com.javaeye.common.util; H!Od.$ZIX
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import java.util.List; \O0fo^+U,,
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publicclass PaginationSupport { ]Yj>~k:K
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publicfinalstaticint PAGESIZE = 30; eT|_0kx1
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privateint pageSize = PAGESIZE; g@U#Y#b@"
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privateList items; {10ms_s
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privateint totalCount; ?UxY4m%R;
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privateint[] indexes = newint[0]; UP`q6]P
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privateint startIndex = 0; \8$`:3,@
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public PaginationSupport(List items, int ,qfa,O
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totalCount){ Stc\P]%d
setPageSize(PAGESIZE); P$QjDu-
setTotalCount(totalCount); };j&)M
setItems(items); K]u|V0c
setStartIndex(0); %b?Pasf.
} \1Bgs^
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public PaginationSupport(List items, int f@{C3E dd
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totalCount, int startIndex){ Y;w]u_
setPageSize(PAGESIZE);
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setTotalCount(totalCount); 3/AUV%+
setItems(items); Zb
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setStartIndex(startIndex); @(
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} gctaarB&
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public PaginationSupport(List items, int A!D:Kc3
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totalCount, int pageSize, int startIndex){ </X"*G't
setPageSize(pageSize); 9X%Klm 5w
setTotalCount(totalCount); eTc`FXw`
setItems(items); `@M4THt
setStartIndex(startIndex); )
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} /RM-+D:Y
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publicList getItems(){ q(7D8xG;F
return items; K5>:WiY
} Q.1ohj0)
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publicvoid setItems(List items){ nrIL_
this.items = items; F4Uk+|]Bu
} ?nW#qy!R
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publicint getPageSize(){ \DqxS=o;
return pageSize; }^[@m#
} d*$<%J
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publicvoid setPageSize(int pageSize){ )^H9C"7T
this.pageSize = pageSize; r%pFq1/'!
} mj=|oIMwT
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publicint getTotalCount(){ >e;STU
return totalCount; 3+3m`%G
} od1omYsR
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publicvoid setTotalCount(int totalCount){ Qiw4'xQm
if(totalCount > 0){ v4_OUA>z,
this.totalCount = totalCount; T''+zk
int count = totalCount / C-u/{CP
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pageSize; =jc8=h[F<
if(totalCount % pageSize > 0) ==1/N{{R
count++; L59oh
indexes = newint[count]; MuV0;K\
for(int i = 0; i < count; i++){ WgJAr73
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indexes = pageSize * ;&6PL]/d
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} }.UI&UZ-
}else{ ~e77w\Q0
this.totalCount = 0; J xm9@,
} >B /&V|E
} /Jf`x>eiH
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publicint[] getIndexes(){ KM}4^Qc
return indexes; b+].Uc
} $;uWj|
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publicvoid setIndexes(int[] indexes){ _$\5ZVe
this.indexes = indexes; xPMyG);
} (SsH uNt.
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publicint getStartIndex(){ {L4>2rF
return startIndex; %C`'>,t>
} _Sgk^i3v
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publicvoid setStartIndex(int startIndex){ PR@4' r|a
if(totalCount <= 0) BQ9`DYI b
this.startIndex = 0; .\~P -{Hd
elseif(startIndex >= totalCount) f'6qJk%J
this.startIndex = indexes 4ZJT[zi
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[indexes.length - 1]; KtUGI.X
elseif(startIndex < 0) frmqBC VJ:
this.startIndex = 0; lii]4k+z
else{ L);||]B
this.startIndex = indexes a|P~LMPM
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[startIndex / pageSize]; $}^\=p}X
} 3W-NS~y
} 2&gVZ z
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publicint getNextIndex(){ =WmBpUh
int nextIndex = getStartIndex() + o7Cnyy#:
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pageSize; "6E1W,|{
if(nextIndex >= totalCount) <RoX| zJw
return getStartIndex(); ) _9e@~,
else TDl!qp @
return nextIndex; pY)j0tdd
} 6)#- 5m
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publicint getPreviousIndex(){ 5:l*Ib:s7
int previousIndex = getStartIndex() - P 34LV+e
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pageSize; ''(fH$pY
if(previousIndex < 0) y\)G7
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return0; A]Q1&qM%
else hy$MV3LP
return previousIndex; Y8J;+h9
} l:zU_J6
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} 28T\@zi
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抽象业务类 -5V)q.Og
java代码: ><;l:RGK|
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/** M^j<J0(O
* Created on 2005-7-12 E8T"{
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*/ ?%\mQmjas
package com.javaeye.common.business; 9RG\UbX)^|
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import java.io.Serializable; My]+?.Ru
import java.util.List; ~vW)1XnK
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import org.hibernate.Criteria; ; g Z%U
import org.hibernate.HibernateException; LPEjRG,
import org.hibernate.Session; c;c:Ea5
import org.hibernate.criterion.DetachedCriteria; !lR0w|
import org.hibernate.criterion.Projections; /]ku$.mr\
import -W|*fKN`3
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org.springframework.orm.hibernate3.HibernateCallback; 0s860Kn
import ]s*5[=uc2
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org.springframework.orm.hibernate3.support.HibernateDaoS r_4TtP&UW
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upport; jg~_'4f#
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import com.javaeye.common.util.PaginationSupport; y._'K+nl
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public abstract class AbstractManager extends ^F>4~68d
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HibernateDaoSupport { V3##
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privateboolean cacheQueries = false; VVs{l\$=ZV
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privateString queryCacheRegion; O[; +i
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publicvoid setCacheQueries(boolean joe9.{
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cacheQueries){ p?Z(rCp
this.cacheQueries = cacheQueries; /
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} ^rL,&rk
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publicvoid setQueryCacheRegion(String [u[ U_g*
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queryCacheRegion){ <lFdexH"T
this.queryCacheRegion = ?RDO] I>
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queryCacheRegion; A
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} 5!~!j
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publicvoid save(finalObject entity){ d5Qd'
getHibernateTemplate().save(entity); P2Onkl
} NW)M?f+6
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publicvoid persist(finalObject entity){ [G\o+D?2
getHibernateTemplate().save(entity); =Ci13< KQ
} )i @1XH"D
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publicvoid update(finalObject entity){ w$b~x4y%
getHibernateTemplate().update(entity); 90p3V\LO
} r]0(qg
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publicvoid delete(finalObject entity){ 0rcjorWI
getHibernateTemplate().delete(entity); PT+c&5A S
} z`OkHX*+2|
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publicObject load(finalClass entity, 2% %|fU9
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finalSerializable id){ gGmxx,i
return getHibernateTemplate().load v`SY6;<2
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(entity, id); N#UXP5C(
} K@6`-|I
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publicObject get(finalClass entity, l~['[Ub0)
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finalSerializable id){ :c=v}
return getHibernateTemplate().get 9Eg&CZ,9$D
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(entity, id); xZyeX34{M;
} x{Sd
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publicList findAll(finalClass entity){ /VO^5Dnb
return getHibernateTemplate().find("from Ft)
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(u
" + entity.getName()); wyzOcx>M
} XVF^,Yf
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publicList findByNamedQuery(finalString um[!|g/
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namedQuery){ 74_xR
return getHibernateTemplate Gqt-_gga
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().findByNamedQuery(namedQuery); w;+ br
} q@kOTkHv)
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publicList findByNamedQuery(finalString query, 7)J6/('
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finalObject parameter){ `
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return getHibernateTemplate 4P%m>[
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().findByNamedQuery(query, parameter); Me/\z^pF
} W2eAhz&
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publicList findByNamedQuery(finalString query, !)c=1EX]"
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finalObject[] parameters){ ^i'y6J
return getHibernateTemplate aD ESr?
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().findByNamedQuery(query, parameters); ^PqMi:htc
} s<&[\U
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publicList find(finalString query){ {155b0
return getHibernateTemplate().find CCqT tp
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(query); xo Gb
} [M:S`{SbY
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publicList find(finalString query, finalObject 9&K/GaG
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parameter){ r5 yO5W
return getHibernateTemplate().find |s=`w8p
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(query, parameter); PLdn#S}.
} l>&sIX
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public PaginationSupport findPageByCriteria [w+Q^\%bN
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(final DetachedCriteria detachedCriteria){ T2weAk#J
return findPageByCriteria i:Y\`J
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); S LGW:
} {QQl$ys/
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public PaginationSupport findPageByCriteria 2dbRE:v5
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(final DetachedCriteria detachedCriteria, finalint Z]vL%Gg*!
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startIndex){ ^od<JD4
return findPageByCriteria X:=c5*0e
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(detachedCriteria, PaginationSupport.PAGESIZE, E4HU 'y~
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startIndex); Q2s&L]L=
} P`"mM?u
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public PaginationSupport findPageByCriteria :ejJV
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(final DetachedCriteria detachedCriteria, finalint !wh&>3~
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pageSize, 9B/1*+ M
finalint startIndex){ S_Z`so}
return(PaginationSupport) N:W9},
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getHibernateTemplate().execute(new HibernateCallback(){ MFwO9"<A
publicObject doInHibernate Tbf:eVIG
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(Session session)throws HibernateException { tcL2J .
Criteria criteria = ebM{OI
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detachedCriteria.getExecutableCriteria(session); {p/YCch,
int totalCount = h6M;0_'
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((Integer) criteria.setProjection(Projections.rowCount /Ox)|)l
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()).uniqueResult()).intValue(); !'W- 6f
criteria.setProjection J?Iq9f
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:
(null); :&yDqoQKJ
List items = 5Op_*N{V
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criteria.setFirstResult(startIndex).setMaxResults Yx%bn?%;&
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(pageSize).list(); oH-8r:{
PaginationSupport ps = K=\&+at1
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new PaginationSupport(items, totalCount, pageSize, $0qMQ%P
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startIndex); Tr .hmG U
return ps; 3 ^}A %-bS
} xsP4\C>
}, true); ]QrR1Rg
} A3R#z]Ub
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public List findAllByCriteria(final @Icq1zb]
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DetachedCriteria detachedCriteria){ O\Eqr?%L)
return(List) getHibernateTemplate jw>hk
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().execute(new HibernateCallback(){ DxS sg
publicObject doInHibernate ^T079=$5
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(Session session)throws HibernateException { qL
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Criteria criteria = 6/Y1 wu
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detachedCriteria.getExecutableCriteria(session); >l5u54^3K
return criteria.list(); P&=lV}f
} A lwtmDa
}, true); reiU%C
}
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public int getCountByCriteria(final wk$,k
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DetachedCriteria detachedCriteria){ }[!92WS/ee
Integer count = (Integer) iHBB,x
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getHibernateTemplate().execute(new HibernateCallback(){ ZFxLBb:
publicObject doInHibernate 7P**:b
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(Session session)throws HibernateException { Xs$Ufi
Criteria criteria = w{,4rk;Hr
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detachedCriteria.getExecutableCriteria(session); |g&ymFc
return @,OT/egF4:
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criteria.setProjection(Projections.rowCount 4IsG=7
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()).uniqueResult(); !m y8AWO'
} mG2'Y) Sz
}, true); wEEn?
return count.intValue(); x]4Kkpqm
} 8l+H"M&|
} R: Z_g!h
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用户在web层构造查询条件detachedCriteria,和可选的 eph)=F$
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 }*wLEa
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PaginationSupport的实例ps。 !{UTD+|=N
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ps.getItems()得到已分页好的结果集 %,V
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ps.getIndexes()得到分页索引的数组 Jfhk@27T
ps.getTotalCount()得到总结果数 F jrINxL7^
ps.getStartIndex()当前分页索引 @F5f"8!.\
ps.getNextIndex()下一页索引 '\7G@g?UZ
ps.getPreviousIndex()上一页索引 CboLH0Fa
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 %V_-%/3Z
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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[q\ e<V<
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一下代码重构了。 Z|m`7xeCy
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我把原本我的做法也提供出来供大家讨论吧: TJ_=1Y@z
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首先,为了实现分页查询,我封装了一个Page类:
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java代码: c0- ;VZ'
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/*Created on 2005-4-14*/ ]!"S+gT*C
package org.flyware.util.page; ](0mjE04<d
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/** oOU1{[
* @author Joa /BA{O&Ro^
* oF:v
JDSS
*/ 5]Da{Wmgs
publicclass Page { c-1q2y
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/** imply if the page has previous page */ *|:Q%xr-
privateboolean hasPrePage; #@.-B,]
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/** imply if the page has next page */ EMvHFu
privateboolean hasNextPage; ]/2T\w.<
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/** the number of every page */ $K}DB N; 4
privateint everyPage; m\u26`M
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/** the total page number */ S]/b\B.h+
privateint totalPage; ;@mRo`D`
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/** the number of current page */ ]wn/BG)
privateint currentPage; A$/\1282
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/** the begin index of the records by the current "E*e2W
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query */ Yg|lq9gD
privateint beginIndex; Bik*b)9y2
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/** The default constructor */ x i~uv?f
public Page(){ -b;|q.!
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} *#U+qgA;`
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/** construct the page by everyPage `8_z!)
* @param everyPage
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