Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 63pd W/\j
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 LZ1)zoJ
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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 C\gKJW^]y@
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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 8@d@T V!n&
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分页支持类: }9 I,p$
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java代码: G9r~O#=gy
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package com.javaeye.common.util; yuq2)
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import java.util.List; nm]m!.$d
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publicclass PaginationSupport { FZ=xy[q]~
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publicfinalstaticint PAGESIZE = 30; kuW^_BROJ
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privateint pageSize = PAGESIZE; r5'bt"K\>
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privateList items; F%G} >xn
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privateint totalCount; I"2*}v|
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privateint[] indexes = newint[0]; K5}0!_)G
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privateint startIndex = 0;
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public PaginationSupport(List items, int E{{Kzr2$
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totalCount){ =&roL7ps
setPageSize(PAGESIZE); ibh,d.*~g
setTotalCount(totalCount); ]Yk)A.y
setItems(items); jAy0k
setStartIndex(0); X
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} .g!K| c
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public PaginationSupport(List items, int o4nDjFhh
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totalCount, int startIndex){ w7b\?]}@
setPageSize(PAGESIZE); WlmkM?@
setTotalCount(totalCount); YU/?AQg
setItems(items); nG0R1<
setStartIndex(startIndex); (0^ZZe`#j
} )_SpY\J
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public PaginationSupport(List items, int 0n*D](/NK
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totalCount, int pageSize, int startIndex){ )F,z pGG
setPageSize(pageSize); %`}nP3
setTotalCount(totalCount); @IV,sze
setItems(items); dK>sHUu
setStartIndex(startIndex); LyRW\\z2
} S9dXkd
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publicList getItems(){ 1\-r5e; BE
return items; jR>`Xz
} -.l.@
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publicvoid setItems(List items){ QM@zy
this.items = items; 2BV]@]qB
} ry0YS\W
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publicint getPageSize(){ ]D[\l$(
return pageSize; T}59m;I
} j%=X
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publicvoid setPageSize(int pageSize){ r0*Y~
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this.pageSize = pageSize; iAZbh"I
} sq?js#C5
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publicint getTotalCount(){ %a']TX
return totalCount; yf/i)
} _RE;}1rb,
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publicvoid setTotalCount(int totalCount){ w>\_d
if(totalCount > 0){ i(>
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this.totalCount = totalCount; 3!vnSX(iv
int count = totalCount / U'@ ![Fp
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pageSize; o+Fm+5t;
if(totalCount % pageSize > 0) lcK4 Uq\q
count++; 0[E\h
indexes = newint[count]; ~bsdy2&/q
for(int i = 0; i < count; i++){ 7MQh,J!"
indexes = pageSize * &z@}9U*6b
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} +QP(ATdM
}else{ oSIP{lfp2Q
this.totalCount = 0; EVP{7}K1
} J vq)%t8q>
} q7<=1r+
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publicint[] getIndexes(){ VxtX%McK
return indexes; D>0(*O
} #HZ W57"
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publicvoid setIndexes(int[] indexes){ Up0kTL
this.indexes = indexes; i6<uj
} AG><5 }
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publicint getStartIndex(){ Xyjd7"
return startIndex; ),Hr
} 3^5h:OaT
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publicvoid setStartIndex(int startIndex){ NS-0-o|4#
if(totalCount <= 0) ZsSW{ffZ77
this.startIndex = 0; FmSE]et
elseif(startIndex >= totalCount) _qk
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this.startIndex = indexes ld3H"p rR
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[indexes.length - 1]; ae" o|Q
elseif(startIndex < 0) /B)2L]6p
this.startIndex = 0; Mfnfp{.)
else{ %+/Dv
this.startIndex = indexes Xk\IO0GF
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[startIndex / pageSize]; Swh\^/B8
} E\TWPV'/
} m^
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publicint getNextIndex(){ m_.9PZ
int nextIndex = getStartIndex() + L/In~'*-
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pageSize; 2_ 1RJ
if(nextIndex >= totalCount) ;e.8EL
return getStartIndex(); p=3t!3
else P+BGCc%);B
return nextIndex; 5h |aX
} ix$
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publicint getPreviousIndex(){ #%w+PL:*O
int previousIndex = getStartIndex() - maeQ'Sv_&
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pageSize; A@9\Qd
if(previousIndex < 0) c91^7@Xv
return0; fefy`J
else wE"lk
return previousIndex; HB`'S7Q
} L9XfR$7,z
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} WP?]"H
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抽象业务类 -v-kFzu
java代码: bDudETl
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/** ||fw!8E
* Created on 2005-7-12 yYSmmgrX0
*/ ^M%P43
package com.javaeye.common.business; ?PqkC&o[q
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import java.io.Serializable; ("F$r$9S
import java.util.List; -2!S>P Zs
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import org.hibernate.Criteria; Vr Lp5?Bh
import org.hibernate.HibernateException; 4_ypFuS ^
import org.hibernate.Session; 1zCu1'Wv
import org.hibernate.criterion.DetachedCriteria; Wp+lI1t
import org.hibernate.criterion.Projections; I?E+
import 8)>T>-os
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org.springframework.orm.hibernate3.HibernateCallback; 8#g}ev@|u
import t- TUP>_
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org.springframework.orm.hibernate3.support.HibernateDaoS ZZZ`@pXm;
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upport; ! L|l(<C
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import com.javaeye.common.util.PaginationSupport; +nHr+7}
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public abstract class AbstractManager extends po\jhfn
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HibernateDaoSupport { }h1LH4
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privateboolean cacheQueries = false; VcXr!4M
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privateString queryCacheRegion; ,A7:zxnc.V
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publicvoid setCacheQueries(boolean mdyl;e{0
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cacheQueries){ Dt> tTU 6
this.cacheQueries = cacheQueries; 65JG#^)KaX
} *0Z6H-Do,
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publicvoid setQueryCacheRegion(String (9ZW^flY
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queryCacheRegion){ )Ute
this.queryCacheRegion = kr|r-N`
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queryCacheRegion; *3E3,c8{A
} [W{|94q
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publicvoid save(finalObject entity){ kTfRm^
getHibernateTemplate().save(entity); X@}7 #Vt
} .a :7|L#a
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publicvoid persist(finalObject entity){ qTRP2rH,L&
getHibernateTemplate().save(entity); h.]^ o*DJ
} gY[G>D=
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publicvoid update(finalObject entity){ jD"nEp-
getHibernateTemplate().update(entity); p7Zeudmj
} llR5qq=t
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publicvoid delete(finalObject entity){ Q:7P
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getHibernateTemplate().delete(entity); <*z'sUh+}
} A^6z.MdYZ
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publicObject load(finalClass entity, {d'B._#i
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finalSerializable id){ =WI3#<vDG
return getHibernateTemplate().load D</?|;J#/
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(entity, id); G~.VW48{n
} x=a#|]ngG
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publicObject get(finalClass entity, K$D+TI)
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finalSerializable id){ rA8NE>
return getHibernateTemplate().get RA!m,"RM
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(entity, id); sx;/xIU|
} UtJfO`m9P
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publicList findAll(finalClass entity){ 0S; Ipg
return getHibernateTemplate().find("from t4d/%b~{:U
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" + entity.getName()); 0vDvp`ie#4
} roAHkI
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publicList findByNamedQuery(finalString Gs|a$^V|o
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namedQuery){ ]e5aHpgR=
return getHibernateTemplate @oj_E0i3
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().findByNamedQuery(namedQuery); *P7n YjG
} <3tf(?*,k]
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publicList findByNamedQuery(finalString query, y]obO|AH
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finalObject parameter){ `FNU-
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return getHibernateTemplate yB*aG
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().findByNamedQuery(query, parameter); @>~S$nw/
} UHi^7jQ
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publicList findByNamedQuery(finalString query, E=S_1
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finalObject[] parameters){ {~}: oV
return getHibernateTemplate pp*MHM)x|q
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().findByNamedQuery(query, parameters); A>F&b1
} X"g,QqDD
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publicList find(finalString query){ wRwx((eb
return getHibernateTemplate().find +kxk z"fP
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(query); gMq;
} ,g?M[(wtc
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publicList find(finalString query, finalObject d/*EuJYin<
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parameter){ 1y U!rEH
return getHibernateTemplate().find s/E9$*0
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(query, parameter); X3gYe-2
} TQ/#
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public PaginationSupport findPageByCriteria R*LPwJuv
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(final DetachedCriteria detachedCriteria){ {/?{UbU
return findPageByCriteria em^2\*sxpA
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); <>-gQ9
} ]>sMu]biH
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public PaginationSupport findPageByCriteria Y%]g,mG
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(final DetachedCriteria detachedCriteria, finalint e*Nm[*@UW
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startIndex){ ^( C,LVP<
return findPageByCriteria EOqV5$+
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(detachedCriteria, PaginationSupport.PAGESIZE, M5`m5qc3
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startIndex); *x2u
} 3+U2oI:I
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public PaginationSupport findPageByCriteria 5/m*Lc+r
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(final DetachedCriteria detachedCriteria, finalint Mwj7*pxUh
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pageSize, J[K>)@I/
finalint startIndex){ _A]~`/0;`
return(PaginationSupport) OQuTM[W
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getHibernateTemplate().execute(new HibernateCallback(){ l`JKQk
publicObject doInHibernate g8"{smP/
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(Session session)throws HibernateException { T z+Y_
Criteria criteria = S |@
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detachedCriteria.getExecutableCriteria(session); =E~SaT
int totalCount = <sGioMr
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((Integer) criteria.setProjection(Projections.rowCount ;]/cCi
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()).uniqueResult()).intValue(); ,Qe`(vU*s
criteria.setProjection )GC[xo4bg
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(null); dUceZmAl
List items = Gh'{O/F4*
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criteria.setFirstResult(startIndex).setMaxResults wLQM]$O
*;.:UR[i
(pageSize).list(); `5~<)
PaginationSupport ps = /dVcNo3"
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new PaginationSupport(items, totalCount, pageSize, n^epC>a" b
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startIndex); KiNluGNt
return ps; U:IeMf-;
} I)G.tJZ
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}, true); "r{
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} +n 8,=}
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public List findAllByCriteria(final KR4 RIJZ_t
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DetachedCriteria detachedCriteria){ ]b&qC
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return(List) getHibernateTemplate E|B1h!!\c
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().execute(new HibernateCallback(){ )#cGePA
publicObject doInHibernate _Q\u-VN*hv
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(Session session)throws HibernateException { FCYZ9L5uF
Criteria criteria = gJZ9XLPC
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detachedCriteria.getExecutableCriteria(session); lGX_5R
return criteria.list(); v[?eL0Z
} FEg&EYI
}, true); s8kkf5bu
} z* :.maq
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public int getCountByCriteria(final %5bN@XD
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DetachedCriteria detachedCriteria){ &T-udgR9
Integer count = (Integer) m=IA/HOR^
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getHibernateTemplate().execute(new HibernateCallback(){ W;wu2 '
publicObject doInHibernate a,p7l$kK
ch}(v'xv(
(Session session)throws HibernateException { *
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Criteria criteria = nr{}yQu
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detachedCriteria.getExecutableCriteria(session); s^AZ)k~J(
return 3sGe#s%
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criteria.setProjection(Projections.rowCount ~7=w,+
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()).uniqueResult(); C[(Exe
} `L}Irt}
}, true); IqONDdep9
return count.intValue(); P!2[#TL0
} ,t>/_pI+=
} @AkD-}^[
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用户在web层构造查询条件detachedCriteria,和可选的 }+f@$L
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 G;pxB,4s5
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PaginationSupport的实例ps。 X<"W@
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ps.getItems()得到已分页好的结果集 t%<d}QuHW
ps.getIndexes()得到分页索引的数组 ;H8A"$%n~
ps.getTotalCount()得到总结果数 J;BG/VI1
ps.getStartIndex()当前分页索引 e c`3Qw
ps.getNextIndex()下一页索引 G@QZmuj&KH
ps.getPreviousIndex()上一页索引 <)(STo
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 C"ZCX6p+$
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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 Jk7[}Jc$
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一下代码重构了。 8V3SZ17
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我把原本我的做法也提供出来供大家讨论吧: }3!.e
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首先,为了实现分页查询,我封装了一个Page类: p68)
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java代码: n2H2G_-L[
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/*Created on 2005-4-14*/ Y&5h_3K;<
package org.flyware.util.page; 8a1G0HRQ
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/** '?k*wEu
* @author Joa
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* Jj'~\j
*/ /Et:',D
publicclass Page { #3u;Ox
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/** imply if the page has previous page */ X Jy]d/
privateboolean hasPrePage; |L7
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/** imply if the page has next page */ '5eW"HGU]`
privateboolean hasNextPage; G?d28p',.
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/** the number of every page */ *Ta*0Fr=9|
privateint everyPage; 0BIH.ZV#
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/** the total page number */ *, o)`
privateint totalPage; M(S:&GOU
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/** the number of current page */ 6?ylSQ]1
privateint currentPage; OY6lt.t
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/** the begin index of the records by the current C=AX{sn
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query */ 6kKIDEX
privateint beginIndex; X4Eq/q"
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/** The default constructor */ e ?H`p"l
public Page(){ w.Ft-RXA W
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} .t0Q>:}&b
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/** construct the page by everyPage W04-D
* @param everyPage bY;ah;<
* */ oO>mGl36H
public Page(int everyPage){ `hL16S
this.everyPage = everyPage; 5>JrTO5
} dHzo_VV
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/** The whole constructor */ X'WbS
public Page(boolean hasPrePage, boolean hasNextPage, 'zZN]P
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int everyPage, int totalPage, zrG&p Z
int currentPage, int beginIndex){ _Y*]'?g`
this.hasPrePage = hasPrePage; m>? OjA!
this.hasNextPage = hasNextPage; 2bfKD'!aH
this.everyPage = everyPage; 4 ?,N;Q
this.totalPage = totalPage; +=^10D
this.currentPage = currentPage; a4L8MgF&$-
this.beginIndex = beginIndex; $v+Q~\'
} N'!a{rF
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/** aDTNr/I
* @return 3xh~xE
* Returns the beginIndex. {(AYs*5
*/ 'ac %]}`-
publicint getBeginIndex(){ M"#xjP.
return beginIndex; 9dr\=e6) C
} z'MOuz~Y
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/** ZPY#<^WOzr
* @param beginIndex _CBG?
* The beginIndex to set. [L"(flY(E
*/ SI)u@3hl&w
publicvoid setBeginIndex(int beginIndex){ HkD6aJ:kA!
this.beginIndex = beginIndex; }i./,
} vz*QzVk1
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/** ,l#Ev{
* @return G0|j3y9$
* Returns the currentPage. vu;pILN
*/ -S
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publicint getCurrentPage(){ P|_>M SO1'
return currentPage; ,[%KSyH
} |#Bz&T
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/** 9^<t0oY
* @param currentPage S
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* The currentPage to set. * f=H#
*/ f3]Z22Yq
publicvoid setCurrentPage(int currentPage){ r:2G 11[
this.currentPage = currentPage; Zx7Y ,0
} kFW9@!9
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/** DZ
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* @return ?`,<l#sj
* Returns the everyPage. >fPa>[_1
*/ 9"KEHf!
publicint getEveryPage(){ +ZEj(fd9
return everyPage; <T+)~&g$
} YN#i^(
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/** _$ ]3&P
* @param everyPage ]
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* The everyPage to set. u;GS[E4
*/ i<l_z&
publicvoid setEveryPage(int everyPage){ K2<"O qp_W
this.everyPage = everyPage; 7,ysixY
} 9^,MC&eb
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/** j
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* @return w
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* Returns the hasNextPage. Jw)Uk<