Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 &([Gc+"5E.
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 cdfnM% `>\
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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 T%2%*oa
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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 /5:qS\Zl
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分页支持类: X*M-- *0q'
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java代码: oeG?2!Zh
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package com.javaeye.common.util; K`cy97
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import java.util.List; .@f)#2
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publicclass PaginationSupport { 2{)<Df@
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publicfinalstaticint PAGESIZE = 30; FVoKNaK-
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privateint pageSize = PAGESIZE; A@I3:V
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privateList items; !%G;t$U=M
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privateint totalCount; N|s8PIcSp
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privateint[] indexes = newint[0]; sQa9M
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privateint startIndex = 0; 9B1bq #
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public PaginationSupport(List items, int 2v1dSdX,W
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totalCount){ U{-[lpd
setPageSize(PAGESIZE); $
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setTotalCount(totalCount); wEbO|S+K1
setItems(items); _zFJ]7Ym.)
setStartIndex(0); Wi!$bL`l
} ' ui`EL %
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public PaginationSupport(List items, int AG,;1b,:81
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totalCount, int startIndex){ I6F $@
setPageSize(PAGESIZE); \W})Z72
setTotalCount(totalCount); Y t0s
setItems(items); vTYgWR,h
setStartIndex(startIndex); lyrwm{&
} fuA8jx
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public PaginationSupport(List items, int +8V|
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totalCount, int pageSize, int startIndex){ zH?&FtO
setPageSize(pageSize); 8*yky
setTotalCount(totalCount); `v$Bib)
setItems(items); >oc&hT
setStartIndex(startIndex); fsVr<m
} u=p-]?
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publicList getItems(){ }WG -R
return items; >{kPa|
} l j*J|%~
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publicvoid setItems(List items){ Kkz2N
this.items = items; } T<oLvS
} mnWbV\ VY
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publicint getPageSize(){ z6Jfu:_N!
return pageSize; x<e-%HB*-
} AehkEN&H/t
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publicvoid setPageSize(int pageSize){ 4 '-GcH
this.pageSize = pageSize; U?Icyn3q0
} M4TFWOC1
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publicint getTotalCount(){ Ayi
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return totalCount; BHBMMjY5
} }8qsE
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publicvoid setTotalCount(int totalCount){ XZ8;Ow=
if(totalCount > 0){ (KxL*gB
this.totalCount = totalCount; PNMf5'@m
int count = totalCount / y:+s*x6Vg
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pageSize; xiPP&$mg
if(totalCount % pageSize > 0) c;e2=
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count++; Q-GnNT7MB3
indexes = newint[count]; NTtRz(
for(int i = 0; i < count; i++){ q#~]Hp=W5
indexes = pageSize * %L9A6%gr
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} /M "E5
}else{ K9y!ZoB
this.totalCount = 0; W}5 H'D
} ?geEq'
} }3Y3f).ZW
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publicint[] getIndexes(){ 97um7n
return indexes; lAwOp
} :bA@
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publicvoid setIndexes(int[] indexes){ )ccdfSe
this.indexes = indexes; ,e
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} vx\h
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publicint getStartIndex(){ WM}bM]oe
return startIndex; t'EH_U
} ya'@AJS
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publicvoid setStartIndex(int startIndex){ j}?O
if(totalCount <= 0) I/s?]v
this.startIndex = 0; P~0d'Oi
elseif(startIndex >= totalCount) M,Px.@tw.
this.startIndex = indexes 8P 3EQY-
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[indexes.length - 1]; R?Q@)POW
elseif(startIndex < 0) B*owV%
this.startIndex = 0; rY>{L6d
else{ r^?%N3
this.startIndex = indexes !o 7uZC\
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[startIndex / pageSize]; ]*^mT&$7
} J|Lk::Ri
} Z8=4cWI~;
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publicint getNextIndex(){ C<6IiF[>%
int nextIndex = getStartIndex() + =ot`V; Q>
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pageSize; zk4yh%Cd_
if(nextIndex >= totalCount) O;:8mm%(
return getStartIndex(); 0X)'8N
else ~"5WQK`@
return nextIndex; 8jjJ/Mz`
} ZBJYpeGe
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publicint getPreviousIndex(){ QH4nb h4
int previousIndex = getStartIndex() - 7fl'nCo\"
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pageSize; j*$GP'Df3
if(previousIndex < 0) "wxs
return0; $<]y.nr|CX
else ;2}0Hr'|
return previousIndex; :f^O!^N
} Gn;eh~uw;l
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} -b(:kAwStk
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抽象业务类 5D]%E?ag
java代码: ;oULtQ
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/** T |'Ur#
* Created on 2005-7-12 iAT&C`,(&
*/ 6yTL7@V|B
package com.javaeye.common.business; ,US~p_M!
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import java.io.Serializable; XT= #+
import java.util.List; _:M6~XHo
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import org.hibernate.Criteria; c1CP12
import org.hibernate.HibernateException; QD<^VY6
import org.hibernate.Session; ;myu8B7&
import org.hibernate.criterion.DetachedCriteria; z8>KY/c
import org.hibernate.criterion.Projections; `U!eh1*b
import 5]p>&|Ud
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org.springframework.orm.hibernate3.HibernateCallback; X'jEI{1w
import g;v{JB
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org.springframework.orm.hibernate3.support.HibernateDaoS u;&`_=p
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upport; =[t( [DG
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import com.javaeye.common.util.PaginationSupport; .XURI#b
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public abstract class AbstractManager extends qJ"dkT*
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HibernateDaoSupport { wXXv0OzK
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privateboolean cacheQueries = false; +#1WOQfAD
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privateString queryCacheRegion; pwd7I
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publicvoid setCacheQueries(boolean "@GopD
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cacheQueries){ *[W! ng
this.cacheQueries = cacheQueries; >0@X^o
} F2oY_mA
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publicvoid setQueryCacheRegion(String L V33vy
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queryCacheRegion){ I.y|AQB
this.queryCacheRegion = xE;fM\7pu
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queryCacheRegion; ]wa?~;1^&
} @%ChPjN
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publicvoid save(finalObject entity){ 6n%^
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getHibernateTemplate().save(entity); q*Ns]f'a
} {U^mL6=&v
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publicvoid persist(finalObject entity){ HEjV7g0E
getHibernateTemplate().save(entity); zMtK_ccQ
} k[Uc_=
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publicvoid update(finalObject entity){ <po(7XB
getHibernateTemplate().update(entity); YaSwn3i/@S
} |4X:>Ut]
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publicvoid delete(finalObject entity){ ",&}vfD4M
getHibernateTemplate().delete(entity); m'aw`?
} f_D1zU^
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publicObject load(finalClass entity, z?j~ 2K<4
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finalSerializable id){ I \vu?$w
return getHibernateTemplate().load qZ_^#%zO
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(entity, id); eg?vYW
} 68 - I2@&
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publicObject get(finalClass entity, ;\Wg>sq
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finalSerializable id){ w:MfaN*
return getHibernateTemplate().get QdC>fy
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(entity, id); VEb}KFyP
} zUwz[^d<C
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publicList findAll(finalClass entity){ ub,Sj{Mq"
return getHibernateTemplate().find("from qMI%=@=
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" + entity.getName()); S'6(&"XCH
} V-7!)&q
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publicList findByNamedQuery(finalString ^BNg^V.
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namedQuery){ P_&2HA,I
return getHibernateTemplate #<v3G)|aS
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().findByNamedQuery(namedQuery); Z[0xqGYLB
} ]d% hU
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publicList findByNamedQuery(finalString query, eW7;yH
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finalObject parameter){ v
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return getHibernateTemplate HK:?Y[ebs
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().findByNamedQuery(query, parameter); W J^r~*r
} #{ `(;83
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publicList findByNamedQuery(finalString query, ]'T-6
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finalObject[] parameters){ 3(AgUq
return getHibernateTemplate 5;dnxhf
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().findByNamedQuery(query, parameters); SBeb}LZ
} _Y}(v((;
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publicList find(finalString query){ L
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return getHibernateTemplate().find E(TL+o
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(query); c5]^jUB6
} #,!.e
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publicList find(finalString query, finalObject |910xd`Z
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parameter){ {!'AR`|
return getHibernateTemplate().find 0Ba-VY.H
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(query, parameter); 2hmV1gj
} 3VALrb;
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public PaginationSupport findPageByCriteria X`^9a5<"
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(final DetachedCriteria detachedCriteria){ K.b-8NIUW
return findPageByCriteria b_\aSEaTT
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); H%Q@DW8~@
} +a"Asvw2
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public PaginationSupport findPageByCriteria R}>Gk
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(final DetachedCriteria detachedCriteria, finalint i<)c4
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startIndex){ /`}C~
return findPageByCriteria F~{yqY5]n
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(detachedCriteria, PaginationSupport.PAGESIZE, A&F@+X6@
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startIndex); Aw9^}k}UfD
} q;t
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public PaginationSupport findPageByCriteria 8$xg\l0?KK
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(final DetachedCriteria detachedCriteria, finalint 1th|n
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pageSize, )bw^!w)
finalint startIndex){ w*$nG$
return(PaginationSupport) VU}UK$JN
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getHibernateTemplate().execute(new HibernateCallback(){ tlI3jrgw
publicObject doInHibernate `!>zYcmT
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(Session session)throws HibernateException { /|`;|0/2
Criteria criteria = ZMy7z|
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detachedCriteria.getExecutableCriteria(session); s1:UCv-%
int totalCount = +cQ4u4
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((Integer) criteria.setProjection(Projections.rowCount $2 ~A^#"0
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()).uniqueResult()).intValue(); DJ[U^dWRn
criteria.setProjection E/Eny5
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(null); r >u0Y
List items = Uj1^?d+b
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criteria.setFirstResult(startIndex).setMaxResults Rfeiv
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(pageSize).list(); X./8
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PaginationSupport ps = E6y/,s^~S_
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new PaginationSupport(items, totalCount, pageSize, nBWrkVX
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startIndex); g@`14U/|
return ps; B`iQN7fd
} {jJUS>
}, true); {~[H"h537t
} 4Y Xtl+G
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public List findAllByCriteria(final Ajs<a(,6
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DetachedCriteria detachedCriteria){ K>,Kbs=D6
return(List) getHibernateTemplate 4/~8zvz&3
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().execute(new HibernateCallback(){ R]m`v: 9
publicObject doInHibernate f(|qE(
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(Session session)throws HibernateException { nxA]EFS
Criteria criteria = `IFt;Ja\6
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detachedCriteria.getExecutableCriteria(session); G5kM0vs6L
return criteria.list(); `P)1RTVx
} <E&1HeP
}, true); Qh? E*9
} gmj
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public int getCountByCriteria(final JUF[Y^C
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DetachedCriteria detachedCriteria){ }Xrs"u,
Integer count = (Integer) bqsb (C
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getHibernateTemplate().execute(new HibernateCallback(){ y@nWa\iG
publicObject doInHibernate S`U Gk
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(Session session)throws HibernateException { 3wX{U8mrg
Criteria criteria = LCyci1\@
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detachedCriteria.getExecutableCriteria(session); U#Wc!QN-t
return \Y
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criteria.setProjection(Projections.rowCount &A*oQ3
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()).uniqueResult(); p27A#Uu2}
} KQJn\#>
}, true); Bag2sk
return count.intValue(); HsR#dp+s~
} l0U6eOx
} k]qZOO}
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用户在web层构造查询条件detachedCriteria,和可选的 /I7sa* i
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 c~5#)AXMT
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PaginationSupport的实例ps。 pvI(hjMYPk
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ps.getItems()得到已分页好的结果集 )_GM&-
ps.getIndexes()得到分页索引的数组 9`4h"9dO
ps.getTotalCount()得到总结果数 ,*E%D _
ps.getStartIndex()当前分页索引 D4
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ps.getNextIndex()下一页索引 smIZ:L%
ps.getPreviousIndex()上一页索引 7KRc^ *pZs
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 K ANE"M
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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 {@Diig
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一下代码重构了。 Ct }"o
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我把原本我的做法也提供出来供大家讨论吧: 4fzq C)
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首先,为了实现分页查询,我封装了一个Page类: R#Bt!RNZ
java代码: PO&xi9_
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/*Created on 2005-4-14*/ t$l[ 4
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package org.flyware.util.page; P2`ks[u+i
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/** &CUkR6
* @author Joa C>T6{$xkC
* ,Yi =s;E
*/ wTIf#y1=9
publicclass Page { \?3];+c9
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/** imply if the page has previous page */ {E 6W]Mno
privateboolean hasPrePage; /jj@ =H
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/** imply if the page has next page */ e% 5!
privateboolean hasNextPage; *
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/** the number of every page */ F6%rH$aS
privateint everyPage; QRdb~f;<hj
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/** the total page number */ t8?+yG;
privateint totalPage; g^0
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/** the number of current page */ gvcT_'
privateint currentPage; b]|7{yMV
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/** the begin index of the records by the current l" sR\`~
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query */ E> 4
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privateint beginIndex; u{H_q&1
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/** The default constructor */ I gFz[)
public Page(){ xUSIck
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} uk\GAm@O
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/** construct the page by everyPage ,9A[o`b
* @param everyPage _')KDy7
* */ E*
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public Page(int everyPage){ SR 43#!99Q
this.everyPage = everyPage; \lY26'
} ~?L. n:wu
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/** The whole constructor */ D2?7=5DgS
public Page(boolean hasPrePage, boolean hasNextPage, l|uN-{w
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int everyPage, int totalPage, 99ZQlX
int currentPage, int beginIndex){ dvXu?F55
this.hasPrePage = hasPrePage; 3b[_0
this.hasNextPage = hasNextPage; nKHyq\
this.everyPage = everyPage; sX**'cH
this.totalPage = totalPage; FD`V39##
this.currentPage = currentPage; ZAiQofQ:2
this.beginIndex = beginIndex; 3F4I{L
} 0#yo\McZ
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/** s\ ~r
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* @return "urQUpF
* Returns the beginIndex. : 0%V:B
*/ M&>Z[o
publicint getBeginIndex(){ )D#*Q~
return beginIndex; )fC^h=Qp
} {WC{T2:8
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/** R_Z
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* @param beginIndex 2?m'Dy'JE
* The beginIndex to set.
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*/ "4ovMan
publicvoid setBeginIndex(int beginIndex){ bx5X8D
this.beginIndex = beginIndex; \Mi y+<8$
} yCmiW
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/** #^eviF8
* @return /r]IY.
* Returns the currentPage. PR.?"$!D{
*/ Rr:,'cXGi
publicint getCurrentPage(){ % +eZ U)N
return currentPage; Gh@QR`xxc
} :.Np7[~{
3g} ]nj:N
/** *xt3mv/<z
* @param currentPage CjykM])
* The currentPage to set. QDyL0l{C
*/ x==%BBnO%
publicvoid setCurrentPage(int currentPage){ xy[R9_V
this.currentPage = currentPage; U*,5t81
} Z.rKV}yjY
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/** ZG<