Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 <,(6*b
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 X4!`
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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 br.jj
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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 bqJL@!T
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分页支持类: 6k%N\!_TUW
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java代码: sI,T"D?
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package com.javaeye.common.util; 1`Cr1pH
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import java.util.List; l]%_D*<Y
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publicclass PaginationSupport { tQ< ou,
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publicfinalstaticint PAGESIZE = 30; "[L[*>[9!
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privateint pageSize = PAGESIZE; 3v
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privateList items; T;w%-k\<r
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privateint totalCount; 3;Kv9i<~LE
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privateint[] indexes = newint[0]; ,
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privateint startIndex = 0; J
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public PaginationSupport(List items, int :/c=."z.
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totalCount){ \|BtgT *$b
setPageSize(PAGESIZE); B_i@D?bTD
setTotalCount(totalCount); |lm
setItems(items); poGF
setStartIndex(0); lsU|xOB
} MLtfi{;LH
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public PaginationSupport(List items, int s+YQ
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totalCount, int startIndex){ mk~&>\
setPageSize(PAGESIZE); ~'m
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setTotalCount(totalCount); a)^f`s^aa
setItems(items); }i!hzkK#
setStartIndex(startIndex); *>h"}e41
} p 2It/O
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public PaginationSupport(List items, int 8G;
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totalCount, int pageSize, int startIndex){ x* *]@v"g
setPageSize(pageSize); cod__.
setTotalCount(totalCount); r0379 _
setItems(items); oFB~)}f<v
setStartIndex(startIndex); V%g$LrLVe
} 6Db1mvSe
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publicList getItems(){ }` E5I&r4
return items; Rx<m+=
} {Lwgj7|~
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publicvoid setItems(List items){ `of 5h*k
this.items = items; j2\bCGY
} <k-&Lh:o3
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publicint getPageSize(){ 8ME_O~,N
return pageSize; 2~Z P[wr
} FPE[}
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publicvoid setPageSize(int pageSize){ 5+].$
this.pageSize = pageSize; S9S8T+
} .0k ltnB
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publicint getTotalCount(){ /k qW
return totalCount; OJPxV~y
} }-?_c#G3
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publicvoid setTotalCount(int totalCount){ ~B;kFdcVXn
if(totalCount > 0){ 3[B*l@}j
this.totalCount = totalCount; wvBx]$SC
int count = totalCount / 3/>T/To&2
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pageSize; };6[Byf
if(totalCount % pageSize > 0) 92!1I$zi
count++; `WQz_}TqB
indexes = newint[count]; =)5O(h
for(int i = 0; i < count; i++){ n[8ju,=
indexes = pageSize * S&_Z,mT./
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} 8dgI&t
}else{ "| cNY_$&s
this.totalCount = 0; d
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} CB_ww=
} X`xmV!
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publicint[] getIndexes(){ aNLRUdc.
return indexes; z(b0U6)qQ
} 8*z)aB&f3
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publicvoid setIndexes(int[] indexes){ VM=A#}
this.indexes = indexes; y|X</3w
} ]D_"tQ?i
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publicint getStartIndex(){ GcN[bH(@
return startIndex; LA &W@
} WO$9Svh8
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publicvoid setStartIndex(int startIndex){ ~Sy/q]4ys*
if(totalCount <= 0) 5-'jYp/
this.startIndex = 0; uqe{F+;8&
elseif(startIndex >= totalCount) 7i^7sT8t
this.startIndex = indexes y"zgpqJ
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[indexes.length - 1]; )y>o;^5'
elseif(startIndex < 0) xPMTmx?2
this.startIndex = 0; v0uDL7
else{ -OV:y],-
this.startIndex = indexes 6[3oOO:uo
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[startIndex / pageSize]; 1./uJB/
} (ndXz
} u'Ja9m1
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publicint getNextIndex(){ n^vL9n_N
int nextIndex = getStartIndex() + ]^aOYtKX
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pageSize; C1w~z4Qp
if(nextIndex >= totalCount) uP|Py.+
return getStartIndex(); :yg:sU
else PP/EZ ^]b
return nextIndex; PF=BXY1<UL
} qyi5j0)W
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publicint getPreviousIndex(){ 3"v
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int previousIndex = getStartIndex() - fKEZlrw
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pageSize; mL\_C9k,n
if(previousIndex < 0) i,#j@R@.C7
return0; 2XoFmV),F
else E|R^tETb
return previousIndex; 8{DZew /
} ;rwjqUDBz
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} Iw@ou
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抽象业务类 4}0DEH.Vx
java代码: U|tUX)9O
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/** `N;}Gf-'
* Created on 2005-7-12 ( X(61[Lu
*/ 5:S=gARz
package com.javaeye.common.business; q{4W@Um-
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import java.io.Serializable; $y%X#:eLJ
import java.util.List; }5_[t9LX
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import org.hibernate.Criteria; }~B @Z\`O
import org.hibernate.HibernateException; h?t#ABsVK
import org.hibernate.Session; ~nQ= iB
import org.hibernate.criterion.DetachedCriteria; K<k!sh
import org.hibernate.criterion.Projections; d yH<D5
import ~H<oqk:O-
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org.springframework.orm.hibernate3.HibernateCallback; g+(Cs
import [p& n]T
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org.springframework.orm.hibernate3.support.HibernateDaoS vR`#kxSdJ@
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upport; 8x)&4o@
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import com.javaeye.common.util.PaginationSupport; =w&bS,a"y
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public abstract class AbstractManager extends 4lM)ZDg
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HibernateDaoSupport { seQSDCsvw*
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privateboolean cacheQueries = false; ajM3Uwnr
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privateString queryCacheRegion; z (1zth
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publicvoid setCacheQueries(boolean egXHp<bqw
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cacheQueries){ %-nYK3
this.cacheQueries = cacheQueries; X
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} J\@ r~x5G
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publicvoid setQueryCacheRegion(String _DDknQP
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queryCacheRegion){ `s )-
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this.queryCacheRegion = |2L|Zp&
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queryCacheRegion; `j#zwgUs
} :D|5E>o(
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publicvoid save(finalObject entity){ [TW?sW^0
getHibernateTemplate().save(entity); GgU8f0I
} KF .O>c87&
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publicvoid persist(finalObject entity){ {/)q=
getHibernateTemplate().save(entity); ,H)v+lI
} 'VMov
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publicvoid update(finalObject entity){ I>bO<T`
getHibernateTemplate().update(entity); qsT@aSIo9
} /VmtQ{KTt+
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publicvoid delete(finalObject entity){ 7:M`k #oDP
getHibernateTemplate().delete(entity);
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} icrcP ~$A
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publicObject load(finalClass entity, _\2Ae\&c
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finalSerializable id){ O|} p=ny
return getHibernateTemplate().load IgmCZ?l&0
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(entity, id); M1mx {<]A
} {py"Ob_
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publicObject get(finalClass entity, YAdk3y~pL
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finalSerializable id){ & FpoMW
return getHibernateTemplate().get /Kd9UQU
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(entity, id); [yhK4A
} mEZHrr J
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publicList findAll(finalClass entity){ ` ;}w!U
return getHibernateTemplate().find("from ^\f1zg9I
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" + entity.getName()); mXPA1#qo
} -u$U~?|`
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publicList findByNamedQuery(finalString
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namedQuery){ W]W[oTJ5
return getHibernateTemplate A"}Ib'
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().findByNamedQuery(namedQuery); 5$?)f&M
} rJM/.;Ag
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publicList findByNamedQuery(finalString query, v,L@nlD]
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finalObject parameter){ 3sK^
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return getHibernateTemplate dFl8 'D
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().findByNamedQuery(query, parameter); P!yOA_)as
} hDf!l$e.
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publicList findByNamedQuery(finalString query, xE5VXYU
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finalObject[] parameters){ edL sn>\*#
return getHibernateTemplate Vo;0i$
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().findByNamedQuery(query, parameters); 20
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} i*)BFV_-
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publicList find(finalString query){ [9;[g~;E%m
return getHibernateTemplate().find 4J{W8jX
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(query); ^4~?]5Y\
} ]^0mh["
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publicList find(finalString query, finalObject LL_@nvu}M
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parameter){
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return getHibernateTemplate().find 6ltV}Wt-
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(query, parameter); =X;h _GQ
} m2\[L/W]
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public PaginationSupport findPageByCriteria r`Bm"xI
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(final DetachedCriteria detachedCriteria){ 2@Zw#2|]
return findPageByCriteria pM-mZ/?
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); j6dlAe
} Se.qft?D%(
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public PaginationSupport findPageByCriteria +TC##}Zmb
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(final DetachedCriteria detachedCriteria, finalint !q1XyQX
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startIndex){ \HL66%b[
return findPageByCriteria RN2z/FUf
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(detachedCriteria, PaginationSupport.PAGESIZE, T[- %b9h>
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startIndex); (7C$'T-ZK
} @GWlo\rM6^
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public PaginationSupport findPageByCriteria [M2xF<r6t
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(final DetachedCriteria detachedCriteria, finalint K?u:-QX^
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pageSize, }vd72PB
finalint startIndex){ pQoZDD@B$
return(PaginationSupport) RREl($$p
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getHibernateTemplate().execute(new HibernateCallback(){ ]Na; b
publicObject doInHibernate Ch)E:Dvq6
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(Session session)throws HibernateException { 3$3%W<&^
Criteria criteria = bD=R/yA
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detachedCriteria.getExecutableCriteria(session); }O\g<ke:u
int totalCount = nT7]PhJ
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((Integer) criteria.setProjection(Projections.rowCount bsc#Oq]
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()).uniqueResult()).intValue(); g,B@*2Uj
criteria.setProjection } x
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(null); JyePI:B&)j
List items = L7"<a2J
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criteria.setFirstResult(startIndex).setMaxResults lNMJcl3
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(pageSize).list(); %reW/;)l{
PaginationSupport ps = SduUXHk
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new PaginationSupport(items, totalCount, pageSize, On}b|ev
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startIndex); (`<B#D;
return ps; Hp@cBj_@P2
} GL^
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}, true); ]UrlFiR
} (L!u[e0[#
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public List findAllByCriteria(final !lKDNQ8>["
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DetachedCriteria detachedCriteria){ r#d]"3tH
return(List) getHibernateTemplate 0Qg%48u
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().execute(new HibernateCallback(){ Is97>aid
publicObject doInHibernate )+.AgqxI
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(Session session)throws HibernateException { /x/W>J2
Criteria criteria = 1?r$Rx<R
oTA'=<W?D
detachedCriteria.getExecutableCriteria(session); Y5TBWcGU%
return criteria.list(); 0.#%KfQ
} &A^2hPe}
}, true); /sVmQqVY
} ktv{-WG2_
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public int getCountByCriteria(final !)c0
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DetachedCriteria detachedCriteria){ 7VJf~\%1j
Integer count = (Integer) )' 2vUt`_7
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getHibernateTemplate().execute(new HibernateCallback(){ w$Mb+b$
publicObject doInHibernate S1!_ IK$m
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(Session session)throws HibernateException { ND5E`Va5R
Criteria criteria = }Z`@Z'
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detachedCriteria.getExecutableCriteria(session); ;~s@_}&
return CzT_$v_
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criteria.setProjection(Projections.rowCount *OZO} i
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()).uniqueResult(); 4 W+ nSv
} q5w)i
}, true); /zV0kW>N
return count.intValue(); %$!EjyH9
} iainl@3Qj
} 7M9s}b%?
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用户在web层构造查询条件detachedCriteria,和可选的 WTh|7&
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 .{]=v
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PaginationSupport的实例ps。 u"a$/
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ps.getItems()得到已分页好的结果集 k?=V?JWY
ps.getIndexes()得到分页索引的数组 Iyvl6
ps.getTotalCount()得到总结果数 SHPZXJ{
ps.getStartIndex()当前分页索引 M,UYDZ',
ps.getNextIndex()下一页索引 O4 Y;
ps.getPreviousIndex()上一页索引 Va'K~$d_
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 L:EJ+bNG
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 x9CI>l
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一下代码重构了。 Web8"8eD
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我把原本我的做法也提供出来供大家讨论吧: **O4"+Xi8
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首先,为了实现分页查询,我封装了一个Page类: Sq==)$G
java代码: 7f
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/*Created on 2005-4-14*/ Bj7\{x,?
package org.flyware.util.page; -nT+!3A8
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/** )u&_}6z
* @author Joa 9~mi[l~
* `0Q:d'
*/ 7+u%]D!
publicclass Page { {1YT a:evl
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/** imply if the page has previous page */ 73(T+6`
privateboolean hasPrePage; "$8<\k$LGT
et ]*5Y6
/** imply if the page has next page */ bvR*sT#rg
privateboolean hasNextPage; $Y0bjS2J
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/** the number of every page */ #(*WxVE
privateint everyPage; U>x2'B v
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/** the total page number */ hOMFDfhU
privateint totalPage; o-Idr{
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/** the number of current page */ HNuwq\w
privateint currentPage; c)E[K-u
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/** the begin index of the records by the current )3B5"b,
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query */ mLY *
privateint beginIndex; <CmsnX
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/** The default constructor */ ;+b}@e
public Page(){ JkxS1
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} L
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/** construct the page by everyPage Nyqm0C6m^
* @param everyPage Dfhs@ z
* */ fZ g*@RR
public Page(int everyPage){ $=m17GD
this.everyPage = everyPage; }5tn
} AYZds >#Q
};!c]/,
/** The whole constructor */ S8)awTA9
public Page(boolean hasPrePage, boolean hasNextPage, cT0g, ^&
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int everyPage, int totalPage, -5ec8m8
int currentPage, int beginIndex){ : }IS=A
this.hasPrePage = hasPrePage; sTqB%$K}
this.hasNextPage = hasNextPage; "DN `@
this.everyPage = everyPage; 3CHte*NL=
this.totalPage = totalPage; QF>[cdl?8
this.currentPage = currentPage; BVNh>^W5B
this.beginIndex = beginIndex; Nb9pdkf0
} x+TNF>%'D
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/** V7@xr
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* @return +{w&ksk
* Returns the beginIndex. SA7,]&Zb