Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 $@blP<I
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 (W l5F
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 'ehJr/0&g
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 n/3gx4.g
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分页支持类: H.ZmLB
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java代码: F+@E6I'g
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package com.javaeye.common.util; buhn~ c
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import java.util.List; @9QtK69
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publicclass PaginationSupport { 6*,8 H&
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publicfinalstaticint PAGESIZE = 30; {&Fh$H!
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privateint pageSize = PAGESIZE; S)0bu(a`Z,
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privateList items; Pb|'f(
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privateint totalCount; EMe6Z!k
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privateint[] indexes = newint[0]; ZN2g(
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privateint startIndex = 0; nJ|8#U7
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public PaginationSupport(List items, int #(53YoV_8
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totalCount){ o4b!U %
setPageSize(PAGESIZE); OKp(A
setTotalCount(totalCount); *Bt`6u.>e,
setItems(items); /AR;O4X+
setStartIndex(0); q($lL~Ls
} JqO#W1h~R|
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public PaginationSupport(List items, int PZF>ia}
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totalCount, int startIndex){ <)zh2UI
setPageSize(PAGESIZE); B(mxW8y
setTotalCount(totalCount); EO,;^RtB
setItems(items); A`7uw|uO$
setStartIndex(startIndex); 'r%`(Z{~
} daaEN(
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public PaginationSupport(List items, int sa`7_KB
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totalCount, int pageSize, int startIndex){ ih?_ fW
setPageSize(pageSize); +0=u]
setTotalCount(totalCount); !b*lL#s,Y
setItems(items); ctOC.
setStartIndex(startIndex); !UD62yw~
} zVs_|x="
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publicList getItems(){ )@3ce'
return items; QJo)
} Xu$xO(
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publicvoid setItems(List items){ 2F3IC
this.items = items; Mz<4P3"H
} mj<(qZh
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publicint getPageSize(){ %#NaM\=8v
return pageSize; sb_>D`>
} `-4c}T
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publicvoid setPageSize(int pageSize){ !cLX1S
this.pageSize = pageSize; :>'^l?b'WX
} w&v_#\T
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publicint getTotalCount(){ v I]|
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return totalCount; BpCzmU
} PDX^MYoN
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publicvoid setTotalCount(int totalCount){ ]?^m;~MQZ
if(totalCount > 0){ (]>c8;o#b
this.totalCount = totalCount; 6Pl$DSu
int count = totalCount / 'M+iVF6
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pageSize; zb~!>
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if(totalCount % pageSize > 0) lMp)T**
count++; -<}_K,Ky`
indexes = newint[count]; qSMSTmnQ
for(int i = 0; i < count; i++){ El0|.dW
indexes = pageSize * :SSe0ZZ_6b
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} /g'F +{v
}else{ hH{&k>
this.totalCount = 0; E$f.&<>T
} %\[LM$f{z
} R|8)iW^
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publicint[] getIndexes(){ b}o^ ?NtA
return indexes; Yv9(8
} 1d|+7
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publicvoid setIndexes(int[] indexes){ A;w,m{9<
this.indexes = indexes; 'HkV_d[li
} cy?u
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publicint getStartIndex(){ M'HmVg4'
return startIndex; hp,bfcM
}
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publicvoid setStartIndex(int startIndex){ {DBgW},
if(totalCount <= 0) .5|wy<
this.startIndex = 0; E@R7b(:*
elseif(startIndex >= totalCount) HlPf
this.startIndex = indexes N(]6pG=
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[indexes.length - 1]; I8`@Srw8
elseif(startIndex < 0) MH`f!%c
this.startIndex = 0;
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else{ >I8R[@
this.startIndex = indexes qWtvo';3
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[startIndex / pageSize]; )fpZrpLXE
} (5;w^E9*n;
} 1Xt%O86
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publicint getNextIndex(){ d;9 X1`"
int nextIndex = getStartIndex() + QOEcp% 6I}
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pageSize; ?W9$=
if(nextIndex >= totalCount) AlIFTNg:"
return getStartIndex(); ]k]P (w
else lycY1 lK
return nextIndex; 6jiVz%`=Z
} 8"LvkN/v^
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publicint getPreviousIndex(){ \$V~kgQ0
int previousIndex = getStartIndex() - z(aei(U=
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pageSize;
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if(previousIndex < 0) ( m\PcF
return0; HzF
else B~V^?."
return previousIndex; 41^+T<+
} 7<mY{!2iF?
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} 60*2k
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抽象业务类 hoD (G X
java代码: ZTVX5"#Q
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/** e54wAypPOl
* Created on 2005-7-12 BYyR-m
*/ vp1IYW
package com.javaeye.common.business; s6lo11
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import java.io.Serializable; T'
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import java.util.List; fDNiU"
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import org.hibernate.Criteria; :&HrOdz
import org.hibernate.HibernateException; _)yn6M'Dt
import org.hibernate.Session; vXAO#'4tm%
import org.hibernate.criterion.DetachedCriteria; p2GkI/6)uu
import org.hibernate.criterion.Projections; =66dxU?}
import '0[D-jEr
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org.springframework.orm.hibernate3.HibernateCallback; !=3[Bm G
import !<Ma9%uC{
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org.springframework.orm.hibernate3.support.HibernateDaoS uwXquOw
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upport; t4/d1qW0
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import com.javaeye.common.util.PaginationSupport; (y[+s?;WyB
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public abstract class AbstractManager extends
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HibernateDaoSupport { %YlL-*7L
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privateboolean cacheQueries = false; "G].hKgbk*
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privateString queryCacheRegion; y>_lxLhmO#
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publicvoid setCacheQueries(boolean (,
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cacheQueries){ )q8w+'z
this.cacheQueries = cacheQueries; J cL4q\g
} :3pJGMv(
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publicvoid setQueryCacheRegion(String pwtB{6)VH{
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queryCacheRegion){ S}f3b N
this.queryCacheRegion = rG|lRT3-K
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queryCacheRegion; )y4bb^;z
} ON.C%-T-
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publicvoid save(finalObject entity){ XZD9vFj1Z
getHibernateTemplate().save(entity); zePVB-@u
} 2a|9D\
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publicvoid persist(finalObject entity){ 5ltEnvN
getHibernateTemplate().save(entity); dQT A^m
} {}kE=L5
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publicvoid update(finalObject entity){ 2#1"(m{
getHibernateTemplate().update(entity); p2 V8{k
} I(tMw6C$:
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publicvoid delete(finalObject entity){ z SDRZ!
getHibernateTemplate().delete(entity); e&sZ]{uD
} :,Z'/e0&
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publicObject load(finalClass entity, XVr>\T4
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finalSerializable id){ xucrp::g
return getHibernateTemplate().load ySAkj-< /P
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(entity, id); w.Cw)#N
} qWX%[i%
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publicObject get(finalClass entity, nX~Qt%
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finalSerializable id){ _/(DEF+G
return getHibernateTemplate().get TgMa!Vz
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(entity, id); HY-7{irR~
} ZeM~13[
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publicList findAll(finalClass entity){ }MQNzaXY^
return getHibernateTemplate().find("from ere h!
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" + entity.getName()); =h5&:?X
} KYa}k0tVAp
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publicList findByNamedQuery(finalString [A~n=m5H
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namedQuery){ m}Xb #NAF8
return getHibernateTemplate jB)RvvMU5
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().findByNamedQuery(namedQuery); i!0w? /g9
} (zbV-4C
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publicList findByNamedQuery(finalString query, 7Z%EXDm4/c
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finalObject parameter){ m8M2ka
return getHibernateTemplate (bhMo^3/*
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().findByNamedQuery(query, parameter); *rKj%Me
} <"/b 5kc
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publicList findByNamedQuery(finalString query, oKyl2jg+,
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finalObject[] parameters){ (sM$=M<$
return getHibernateTemplate B|9[DNd
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().findByNamedQuery(query, parameters); 'O>p@BEK
}
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publicList find(finalString query){ '`s\_Q)hG_
return getHibernateTemplate().find ul(pp+%S
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(query); `U4e]Qh/+
} _*iy *:(o
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publicList find(finalString query, finalObject BjX*Gm6l
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parameter){ %u=b_4K"j
return getHibernateTemplate().find kPRG^Ox8e
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(query, parameter); <Wrn/%tL
} % 9Jx|
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public PaginationSupport findPageByCriteria !2=m
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(final DetachedCriteria detachedCriteria){ MS5X#B
return findPageByCriteria Yt]Y(
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); N[=c|frho
} K&"ZZFd_
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public PaginationSupport findPageByCriteria
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(final DetachedCriteria detachedCriteria, finalint C>NLZMT
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startIndex){ s2=`haYu
return findPageByCriteria {!0f.nv
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(detachedCriteria, PaginationSupport.PAGESIZE, "udA-;!@&
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startIndex); '@6O3z_{
} S =5br
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public PaginationSupport findPageByCriteria m=[3"X3W1V
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(final DetachedCriteria detachedCriteria, finalint hQb3 8W[
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pageSize, c)`=wDi
finalint startIndex){ ,7:?Du}
return(PaginationSupport) ee2k..Tq#
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getHibernateTemplate().execute(new HibernateCallback(){ Cfr2~w
publicObject doInHibernate F:~k4uTW\b
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(Session session)throws HibernateException { E"<-To
Criteria criteria = <`)vp0
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detachedCriteria.getExecutableCriteria(session); r }S>t~p:
int totalCount = j^5VmG
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((Integer) criteria.setProjection(Projections.rowCount aG&t gD{
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()).uniqueResult()).intValue(); 0n/+X[%Ti
criteria.setProjection ;$Pjl8\
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(null); )+ (GE
List items = %n{ue9
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criteria.setFirstResult(startIndex).setMaxResults ()MUyW"S#`
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(pageSize).list(); /{R>o0oW
PaginationSupport ps = S*l=FRFI
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new PaginationSupport(items, totalCount, pageSize, s&d!+-\6_
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startIndex); _aP2gH
return ps; ~ugyUpY"
} aY8QYK ;?^
}, true); /Ue_1Efa
} GR,gCtG+L
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public List findAllByCriteria(final 7Z<
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DetachedCriteria detachedCriteria){ #z#`EBXV$6
return(List) getHibernateTemplate v"YaMbu
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().execute(new HibernateCallback(){
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publicObject doInHibernate ;q33t%j
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(Session session)throws HibernateException { kInU,/R*
Criteria criteria = kXN8hU}iq
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detachedCriteria.getExecutableCriteria(session); bH}?DMq]O
return criteria.list(); w6
} miUjpXt
}, true); uskJ(!
} g3| 62uDF
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public int getCountByCriteria(final ~.$ca.Gf
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DetachedCriteria detachedCriteria){ ;;
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Integer count = (Integer) %~I%*=o[
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getHibernateTemplate().execute(new HibernateCallback(){ 8
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publicObject doInHibernate r7+Ytr
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(Session session)throws HibernateException { MlV3qM@
Criteria criteria = B=)tq.Q7
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detachedCriteria.getExecutableCriteria(session); 6KE?@3;Om
return U>hpYqf_
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criteria.setProjection(Projections.rowCount )v+\1
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()).uniqueResult(); .#{m1mr
} @MxB
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}, true); &PUn,9 Rm
return count.intValue(); M*Ri1
} wBz5_ OFVw
} m't8\fo^w
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用户在web层构造查询条件detachedCriteria,和可选的 $T7(AohR
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 (9KiIRN
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PaginationSupport的实例ps。 `Y,<[ Lnr
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ps.getItems()得到已分页好的结果集 ^WUG\@B
ps.getIndexes()得到分页索引的数组 e"cvo(}g
ps.getTotalCount()得到总结果数 '_l5Br73=
ps.getStartIndex()当前分页索引 ~=t K17i
ps.getNextIndex()下一页索引 YhO-ecN
ps.getPreviousIndex()上一页索引 "b[w%KYyl
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 C/ENJ&
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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 %b>Ee>rdD
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一下代码重构了。 ys9'1+9
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我把原本我的做法也提供出来供大家讨论吧: >{eGSSG0
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首先,为了实现分页查询,我封装了一个Page类: HFW8x9Cc
java代码: v5 I}a7
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/*Created on 2005-4-14*/ [&+5E1%L
package org.flyware.util.page; S8Yti
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/** EttQ<z_T
* @author Joa ;mwU>l,4
* -J^t#R^$`
*/ (3N;-
publicclass Page { lr9s`>9
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/** imply if the page has previous page */ PvW~EJ
privateboolean hasPrePage; cm`x;[e6l
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/** imply if the page has next page */ &6^QFqqW`-
privateboolean hasNextPage; /^':5"=o
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/** the number of every page */ _$m1?DZ
privateint everyPage; =-;J2Qlg6
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/** the total page number */ c4iGtW
privateint totalPage; c52S2f7
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/** the number of current page */ kZNVUhW6S
privateint currentPage; x%%OgO+>
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/** the begin index of the records by the current o,_R;'\E[a
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query */ tB<|7
privateint beginIndex; .iZo/_
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/** The default constructor */ }\]J?I+ A
public Page(){ F~x>\?iN
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} E&>=
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/** construct the page by everyPage >=d%t6%(
* @param everyPage />dYk Iv
* */ xnPi'?A]
public Page(int everyPage){ s]2_d|Y
this.everyPage = everyPage; m[D]4h9
} >tTu1#t
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/** The whole constructor */ &'oZ]}^0
public Page(boolean hasPrePage, boolean hasNextPage,
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int everyPage, int totalPage, 4 {rj 4P?
int currentPage, int beginIndex){ D}]u9jS1
this.hasPrePage = hasPrePage; iDV.C@
this.hasNextPage = hasNextPage; tVhf1TH#
this.everyPage = everyPage; $kd9^lj#[
this.totalPage = totalPage; @Q%<~b[y
this.currentPage = currentPage; (!0fmL
this.beginIndex = beginIndex; ,g:\8*Y>'
} 8"C[sRhz
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/** y\zRv(T=
* @return -gVsOX0
* Returns the beginIndex. OpFm:j3
*/ B-W8Zq#4>
publicint getBeginIndex(){ L%
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return beginIndex; !uSG 1j"y
} !b8.XGo
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/** h9I vuv'
* @param beginIndex v6KRE3:V
* The beginIndex to set. L<0eIw
*/ s|IC;C|
publicvoid setBeginIndex(int beginIndex){ mH/9J
this.beginIndex = beginIndex; }$Z0v`
} dQJ)0!B
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/** m.w.h^f$&
* @return y8$I=
* Returns the currentPage. ?V' zG&n@
*/ cA{7*=G?
publicint getCurrentPage(){ J1"16Uu
return currentPage; wAF<_NG#
} WnL7 A:sZ
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/** l'twy$V4|~
* @param currentPage f8S! FGiNc
* The currentPage to set. 1`)e}p&
*/ $HP<C>^Z8
publicvoid setCurrentPage(int currentPage){ VRD:PVz
this.currentPage = currentPage; ]La~Bh6;m
} '|@?R |i0
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/** GEtzLaq<
* @return M6XpauR-
* Returns the everyPage. \`Ow)t:
*/ T':} p2}w+
publicint getEveryPage(){ PIM4c
return everyPage; #}S<O_
} }fh<L CwTi
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/** FgnPh%[u
* @param everyPage "-R19SpJKh
* The everyPage to set. 0$=w8tP)
*/ 4~~G
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publicvoid setEveryPage(int everyPage){ 1Uk Gjw1J
this.everyPage = everyPage; D|D)782
} >b2wFo/em
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/** ZK5
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* @return q#\4/Dt
* Returns the hasNextPage. u#nM_UJe
*/ uUJH^pW
publicboolean getHasNextPage(){ /Suh&qw>
return hasNextPage; nR8r$2B+t
} ,vB~9^~
x};sti R
/** qyL!>kZr@
* @param hasNextPage @7`=0;g
* The hasNextPage to set. 1"f)\FPGe
*/ OCEhwB0
publicvoid setHasNextPage(boolean hasNextPage){ N~tq]
this.hasNextPage = hasNextPage; )jGB[s";)y
} Cq[<CPAS
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/** <