Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 =;8q`
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 s?sr0HZ
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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
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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 O St~P^1
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分页支持类: S`spUq1o
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java代码: OYfP!,+bn
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package com.javaeye.common.util; "aGpC{
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import java.util.List; pKL^<'w0
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publicclass PaginationSupport { w`Z@|A
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publicfinalstaticint PAGESIZE = 30; "OKsl2e
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privateint pageSize = PAGESIZE; J$Ba*`~!!
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privateList items; aQfrDM<*XS
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privateint totalCount; j0K}nS\ P
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privateint[] indexes = newint[0]; \tg}K0E?R5
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privateint startIndex = 0; T$xY]hqr
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public PaginationSupport(List items, int W-U[7n
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totalCount){ .zyi'Kj
setPageSize(PAGESIZE); I'RhA\`
setTotalCount(totalCount); -RnQ8Iuo
setItems(items); zFV?,"\r
setStartIndex(0); (/l9@0Y.t
} {-Y% wM8<i
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public PaginationSupport(List items, int j'JNQo;q
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totalCount, int startIndex){ <P1sK/IZb
setPageSize(PAGESIZE); |Gh~Zup
setTotalCount(totalCount); Cy##+u,C
setItems(items); Y)4&PN~[
setStartIndex(startIndex); k
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} _[.3I1kG
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public PaginationSupport(List items, int VDq?,4Kb
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totalCount, int pageSize, int startIndex){ H{CG/+x
setPageSize(pageSize); d^WEfH
setTotalCount(totalCount); @{!c [{x,T
setItems(items); jDO[u!J6.%
setStartIndex(startIndex); lf\]^yM #
} EBN'u&zX
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publicList getItems(){ %g4G&My@J
return items; SXA_P{j&a
} V'4sOn
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publicvoid setItems(List items){ DLv\]\h}L
this.items = items; Em8C +EM
} u<l[S
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publicint getPageSize(){ fE;<)tU
return pageSize; |A#pG^
} 0a??8?Q1G
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publicvoid setPageSize(int pageSize){ Ph'P<h:V
this.pageSize = pageSize; E}d@0C:
} ((}T^
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publicint getTotalCount(){ ? -PRS.=%
return totalCount; ~e5hfZv|w
} $]eITyC`P
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publicvoid setTotalCount(int totalCount){ qJ b9JL$s
if(totalCount > 0){ <0r2m4z
this.totalCount = totalCount; gUs.D_*
int count = totalCount / xn'&TQo0
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pageSize; /d*0+m8
if(totalCount % pageSize > 0) IdsPB)k_
count++; W *t+!cU/:
indexes = newint[count]; )A}u)PH4O
for(int i = 0; i < count; i++){ |UN0jR
indexes = pageSize * <
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} {2EIvKu3:
}else{ UMN3.-4K#
this.totalCount = 0; zrqQcnx9(m
}
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} LD]a!eY
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publicint[] getIndexes(){ x{_:B
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return indexes; 6;WfsG5
} 1 PL2[_2:
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publicvoid setIndexes(int[] indexes){ K(
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this.indexes = indexes; @N,(82k
} Id6H~;
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publicint getStartIndex(){ $]v=2j
return startIndex; ]}t6V]`Q
} ^O#>LbM"x
}
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publicvoid setStartIndex(int startIndex){ xeo5)
if(totalCount <= 0) }H^h~E
this.startIndex = 0; vGe];
elseif(startIndex >= totalCount) 6V{Sf9V|
this.startIndex = indexes B 2p/
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[indexes.length - 1]; V
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elseif(startIndex < 0) US5 ]@!
this.startIndex = 0; ;gS)o#v0
else{ uDhe
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this.startIndex = indexes eh\_;2P
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[startIndex / pageSize]; Yatd$`,hW
}
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} ]ySm|&aU
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publicint getNextIndex(){ +D7>$&BD
int nextIndex = getStartIndex() + `_YXU
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pageSize; SvTd#>ke
if(nextIndex >= totalCount) b+=@;0p*6B
return getStartIndex(); |7Dc7p"D
else 55Pe&V1=
return nextIndex; k4N_Pa$}\
} %mqep5n(
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publicint getPreviousIndex(){ \#50;
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int previousIndex = getStartIndex() - FIMM\W
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pageSize; 4{PN9i
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if(previousIndex < 0) k|hy_? *
return0; '6g;UOx^=
else ~,^pya
return previousIndex; .ZOG,h+8
} .-Z=Aa>
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} g5&ZXA
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抽象业务类 SO|!x}GfI
java代码: t6q7w
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/** /wi*OZ7R
* Created on 2005-7-12 dz6&TdEl
*/ tf3R
package com.javaeye.common.business; G1
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import java.io.Serializable; u+;iR/
import java.util.List; %!\iII
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import org.hibernate.Criteria; H'"=C&D~
import org.hibernate.HibernateException; 2^X<n{0N)
import org.hibernate.Session; f8?hEa:js
import org.hibernate.criterion.DetachedCriteria; SgWLs%B
import org.hibernate.criterion.Projections; ,Mr_F^|
import +Pc2`,pw|
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org.springframework.orm.hibernate3.HibernateCallback; gJH^f3
import csFLBP
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org.springframework.orm.hibernate3.support.HibernateDaoS no$X0ia
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upport; kp-`_sDg
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import com.javaeye.common.util.PaginationSupport; *kt|CXxAS8
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public abstract class AbstractManager extends hRQw]
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HibernateDaoSupport { kr\#CW0?
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privateboolean cacheQueries = false; 3>v-,S+
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privateString queryCacheRegion; `i
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publicvoid setCacheQueries(boolean m f\tMik<
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cacheQueries){ D/ tCB-+
this.cacheQueries = cacheQueries; +V9 (4la
} J'%W_?wZ
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publicvoid setQueryCacheRegion(String ~J0r%P
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queryCacheRegion){ \bies1TBB^
this.queryCacheRegion = QuBA'4ht
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queryCacheRegion; (~NR."s;
} p@?ud%
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publicvoid save(finalObject entity){ ub2B!6f a
getHibernateTemplate().save(entity); t:P]G>)x|
} WQ9VcCY
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publicvoid persist(finalObject entity){ @zJiR{Je-U
getHibernateTemplate().save(entity); 4,&f#=Y
} ,E8g~ZUY9
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publicvoid update(finalObject entity){ Zul@aS
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getHibernateTemplate().update(entity); g)}q3-<AK>
} YlXqj\a
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publicvoid delete(finalObject entity){ z2jS(N?J1
getHibernateTemplate().delete(entity); CropHB/t
} lm*C:e)4A
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publicObject load(finalClass entity, FjW%M;H
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finalSerializable id){ \0)2 u[7
return getHibernateTemplate().load `,Fc271`
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(entity, id); Q6p75$SVq
} M
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publicObject get(finalClass entity, \SBAk
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finalSerializable id){ Bw.?Me)mf|
return getHibernateTemplate().get (e32oP"
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(entity, id); >}r
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} {5SJ0'.B2g
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publicList findAll(finalClass entity){ KcM+8W\
return getHibernateTemplate().find("from ?SX0e(+}}
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" + entity.getName()); jF{)2|5
} \wp8kSzC
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publicList findByNamedQuery(finalString w!R J8
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namedQuery){ 7H. HiyppW
return getHibernateTemplate mFyYn,Mu|
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().findByNamedQuery(namedQuery); lAAP V
} _mDvRFq
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publicList findByNamedQuery(finalString query, 84gj%tw'-
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finalObject parameter){ {#l@9r%
return getHibernateTemplate 7T?7KS
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().findByNamedQuery(query, parameter); tmC9p6%
} Rp.FG
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publicList findByNamedQuery(finalString query, tHo/Vly6Z
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finalObject[] parameters){ NAfu$7
return getHibernateTemplate Mp^U)S+
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().findByNamedQuery(query, parameters); @3>nVa
} 0Y\7A
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publicList find(finalString query){ B'D4]EB
return getHibernateTemplate().find Oxf,2r
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(query); 'p(I!]"uo
} 1H,hw
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publicList find(finalString query, finalObject E%>){Y)
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parameter){ HUY1nb=
return getHibernateTemplate().find evHKq}{
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(query, parameter); ZBfB4<M9xS
} :#p!&Fi
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public PaginationSupport findPageByCriteria >a1ovKF
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(final DetachedCriteria detachedCriteria){ %Tv^BYQAZ
return findPageByCriteria ^k}jPc6
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); j*;/Cah]k
} )*3sE1
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public PaginationSupport findPageByCriteria ]Q\/si&
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(final DetachedCriteria detachedCriteria, finalint !U!}*clYL
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startIndex){ lGP'OY"Q
return findPageByCriteria .% EEly
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(detachedCriteria, PaginationSupport.PAGESIZE, c/E6}OWA
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startIndex); .J3Dk=/
}
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public PaginationSupport findPageByCriteria %L$P']%t@
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(final DetachedCriteria detachedCriteria, finalint #5x[Z[m
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pageSize, X pd^^
finalint startIndex){ xl$#00|y
return(PaginationSupport) V OViOD
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getHibernateTemplate().execute(new HibernateCallback(){ cTeEND)
publicObject doInHibernate bh1WD_
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(Session session)throws HibernateException { NwdA@"YQ|
Criteria criteria = fH7o,U|
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detachedCriteria.getExecutableCriteria(session); !%?X% @9
int totalCount = +)fl9>Mb
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((Integer) criteria.setProjection(Projections.rowCount ^.J
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()).uniqueResult()).intValue(); y3K9rf
criteria.setProjection ~o+HAc`=v
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(null); RYaf{i`
List items = D/Y .'P:j
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criteria.setFirstResult(startIndex).setMaxResults zZ|Si
qF(F<$B
(pageSize).list(); $3sS&i<
PaginationSupport ps = y.~y*c6,g
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new PaginationSupport(items, totalCount, pageSize, ^Q]*CU+C
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startIndex); {@9y%lmrh
return ps; _{o=I?+]
} */n)_
}, true); 0EYK3<k9!
} p
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public List findAllByCriteria(final $LZf&q:\]*
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DetachedCriteria detachedCriteria){ h@T}WZv
return(List) getHibernateTemplate 4?X#d)L(
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().execute(new HibernateCallback(){ 2i4FIS|z0
publicObject doInHibernate
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(Session session)throws HibernateException { X|H%jdta
Criteria criteria = T"'"T]^
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detachedCriteria.getExecutableCriteria(session); x{C=r dp__
return criteria.list(); uRKCvsi sX
} \@Gyl_6^
}, true); =V1k'XJ
} 'z2}qJJ)
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public int getCountByCriteria(final 7Rj!vj/
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DetachedCriteria detachedCriteria){ L*9^-,
Integer count = (Integer) _h7+.U=
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getHibernateTemplate().execute(new HibernateCallback(){ 8UoMOeI3
publicObject doInHibernate xUPM-eF=
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(Session session)throws HibernateException { *8U+2zgfC
Criteria criteria = ;k/y[ x}
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detachedCriteria.getExecutableCriteria(session); X(1nAeQ
return h/`OG>./
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criteria.setProjection(Projections.rowCount U
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()).uniqueResult(); "y~muE:.
} K$<`4#i
}, true); [%7;f|p?
return count.intValue(); {1Ju}=69
} x&R9${e%
} #a(%(k S
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用户在web层构造查询条件detachedCriteria,和可选的 stg30><
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 YY#s=
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PaginationSupport的实例ps。 FJsK5-
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ps.getItems()得到已分页好的结果集 Rwc[:6;fn
ps.getIndexes()得到分页索引的数组 xvwD3.1
ps.getTotalCount()得到总结果数 a^*cZ?Ta
ps.getStartIndex()当前分页索引 DKy>]Hca
ps.getNextIndex()下一页索引 ;x:k-s2-
ps.getPreviousIndex()上一页索引 Vs_\ykO
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5h`m]#YEG
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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 |av*!i5Q
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一下代码重构了。 q';&SR#"`K
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我把原本我的做法也提供出来供大家讨论吧: 0JmFQ^g(
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首先,为了实现分页查询,我封装了一个Page类: ]Nnxnp
java代码: cC^W2\
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/*Created on 2005-4-14*/ <RhOjZgyZ
package org.flyware.util.page; d{er|$E?
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/** LtC~)R
* @author Joa xDR9_
* TQ;
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*/ C">`' G2
publicclass Page { 6ayy[5tW
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/** imply if the page has previous page */ 3\;v5D:
privateboolean hasPrePage; >BBl7
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/** imply if the page has next page */ &|)hCJu
privateboolean hasNextPage; BbFa=H.
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/** the number of every page */ ful#Px6m
privateint everyPage; 2;8Xz6T
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/** the total page number */ *'6s63)I2
privateint totalPage; IE2CRBfs
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/** the number of current page */ z<hFK+j,'^
privateint currentPage; 1n_;kaY
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/** the begin index of the records by the current _1ew(x2J
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query */ hi!`9k
privateint beginIndex; kBo;h.[l
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/** The default constructor */ xOythvO
public Page(){ {3LA%xO
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} PY?8[A+
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/** construct the page by everyPage :}Ok$^5s
* @param everyPage uMvb-8
* */ !DPF7x(-{
public Page(int everyPage){ Y6A;AmM8
this.everyPage = everyPage; /%!~x[BeJ>
} Vo\H<_=G
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/** The whole constructor */ WWNu:,
public Page(boolean hasPrePage, boolean hasNextPage, mk%b9Ko<F
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int everyPage, int totalPage, 7NJFWz!
int currentPage, int beginIndex){ eZH~je{1
this.hasPrePage = hasPrePage; =\Iu$2r`
this.hasNextPage = hasNextPage; )1lu=gc
this.everyPage = everyPage; yzR=A%V8A
this.totalPage = totalPage; T/l1qcf`wT
this.currentPage = currentPage; 3-C\2
this.beginIndex = beginIndex; L[y Pjw:0
} 'H|~u&?
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/** _okWQvdH
* @return Z(e^ iH
* Returns the beginIndex. AOb]qc
*/ SJk>Jt=
publicint getBeginIndex(){ )*|(i]
return beginIndex; U%>'"
} ;hHi@Z9
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/** UV AJxqz%}
* @param beginIndex ab.tH$:<
* The beginIndex to set. P`(Mk6gE
*/ fDh]tua
publicvoid setBeginIndex(int beginIndex){
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this.beginIndex = beginIndex; ,DQjDMjrf
} t
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/** D-&an@
* @return ]s_8A`vm
* Returns the currentPage. lG:kAtx4
*/ 7K;!iX<d
publicint getCurrentPage(){ @?kJ).
return currentPage; :Ht;0|[H
} 28I^$> [
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/** ldqLM
* @param currentPage FwG!>
* The currentPage to set. <RXw M6G2
*/ /M=3X||
publicvoid setCurrentPage(int currentPage){ *[}^[J
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this.currentPage = currentPage; "rhYCZ B
} .0p^W9
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/** 7DD&~ZcD
* @return #7G*GbKY
* Returns the everyPage. nw6pV%
*/ =9wy/c$
publicint getEveryPage(){ r^fe4b
return everyPage; %, P>%'0
} *ZrSiIPP
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/** xHA0gZf
* @param everyPage G`0V)S
* The everyPage to set. viX
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*/ g>JLDQdc
publicvoid setEveryPage(int everyPage){ ;i<jhNA
this.everyPage = everyPage; ?-)I+EAnE
} Na{Y}0=^y
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/** 1q7tiMvV-
* @return ino:N5&;;
* Returns the hasNextPage. xc@Ss[
*/ #5} wuj%5
publicboolean getHasNextPage(){ YJV% a
return hasNextPage; .a'f|c6
} 7gF"=7{-
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/** 88s/Q0l
* @param hasNextPage 3SttHu0X
* The hasNextPage to set. c9"r6j2m5
*/ ;&b.T}Nf06
publicvoid setHasNextPage(boolean hasNextPage){ Q\ppfc{,
this.hasNextPage = hasNextPage; OHv!
} o 5U(i
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/** WJH\~<{mP
* @return !]yO^Ob.E
* Returns the hasPrePage. }_9,w;M$
*/ "R>FqX6FB
publicboolean getHasPrePage(){ CusF/>
return hasPrePage; :aCrX
} hVUh0XeO
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/** rwLAW"0Qz
* @param hasPrePage (V`Md\NL`
* The hasPrePage to set. i%m"@7.kk
*/ W,5Hx1z R
publicvoid setHasPrePage(boolean hasPrePage){ W !w, f;
this.hasPrePage = hasPrePage; XRx+Dddt;
} T;TA7{B
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/** Rhc-q|Lz8
* @return Returns the totalPage. FY{e2~gi
* CC=d I
*/ Mn1Pt|_@!
publicint getTotalPage(){ aT!'}GjL
return totalPage; nfSbM3D]h
} nn/?fIZN4
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/** c/N@zum,{
* @param totalPage "5R~(+~<@
* The totalPage to set. \MC-4Yz
*/ EP'h@zdz
publicvoid setTotalPage(int totalPage){ @hQlrq5c
this.totalPage = totalPage; Q/uwQo/
} g- AHdYJ
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} g9D^) V
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 U$]|~41#
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个PageUtil,负责对Page对象进行构造: ^k5ll=}
java代码: )'17r82a
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/*Created on 2005-4-14*/ gb
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package org.flyware.util.page; M FTkqbc
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import org.apache.commons.logging.Log; @k[R/,#'[t
import org.apache.commons.logging.LogFactory; F<>!kK/c
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/** D]w!2k%V
* @author Joa fkf1m:Ckh
* S}APQ
*/ JD@J[YY5R
publicclass PageUtil { t!*+8Q!e
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privatestaticfinal Log logger = LogFactory.getLog 'WaPrCw@Mf
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(PageUtil.class); I2nF-JzD2a
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/** t`*! w|}(1
* Use the origin page to create a new page ~\{^%~[48
* @param page *Qugv^-
* @param totalRecords ~U;rw&'H
* @return S*j6OwZ
*/ IDnC<