Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 6Cibc.vt
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 &Z9b&P
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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 Si;e_a
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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 hM;E UWv
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分页支持类: <-$4?}
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java代码: k|w6&k3
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package com.javaeye.common.util; \PL92HV
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import java.util.List; &We'omq
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publicclass PaginationSupport { wTOB'
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publicfinalstaticint PAGESIZE = 30; %F03cI,
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privateint pageSize = PAGESIZE; ] $5r h8
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privateList items; %e3lb<sv6
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privateint totalCount; Uq"RyvkpP
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privateint[] indexes = newint[0]; K5!k06;s
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privateint startIndex = 0; HgbJsv$
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public PaginationSupport(List items, int W(EU*~<UC
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totalCount){ YckexfL
setPageSize(PAGESIZE); a}MOhM6T
setTotalCount(totalCount); V<+d o|@F
setItems(items); wN;o++6V
setStartIndex(0); #t9&X8:U
} nJrV
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public PaginationSupport(List items, int I/fERnHM/+
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totalCount, int startIndex){ cLX~NPD/
setPageSize(PAGESIZE); i_ I`Y
setTotalCount(totalCount); *|MPYxJ<
setItems(items); _^Rf*G !
setStartIndex(startIndex); `}s)0 /}6
} r*y4Vx7
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public PaginationSupport(List items, int aZ- )w
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totalCount, int pageSize, int startIndex){ -SZ^;t
setPageSize(pageSize); qJUu9[3'm
setTotalCount(totalCount); ,253'53W)
setItems(items); WY #pzBA
setStartIndex(startIndex); <{:$]3
} XP~4jOL]
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publicList getItems(){ |G!-FmIK
return items; mam|aRzd
} 3/P2&m
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publicvoid setItems(List items){ %E,s*=j
this.items = items; } D{y
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} ~O&3OL:L
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publicint getPageSize(){ PG+ICg
return pageSize; $
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} E0o=
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publicvoid setPageSize(int pageSize){ 2<y!3OeN
this.pageSize = pageSize; LhUrVydL
} ~kj1L@gy
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publicint getTotalCount(){ =TE6R 0b
return totalCount; ^/h,C^/;
} VK5|w:
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publicvoid setTotalCount(int totalCount){ 9~J
if(totalCount > 0){ 0hp*(, L
this.totalCount = totalCount; "u@)
int count = totalCount / R/VrBiw
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pageSize; w)2X0ev"
if(totalCount % pageSize > 0) UC"<5z
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count++; fo;Ftf0
indexes = newint[count]; Ei2hI
for(int i = 0; i < count; i++){ X~(%Y#6
indexes = pageSize * XT~!dq5
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} ?`#)JG,A7
}else{ (U#4j 6Q
this.totalCount = 0; sN]O]qYXJ
} _BHR ?I[w
} U
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publicint[] getIndexes(){ cOkjeHs
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return indexes; >1 {V
} ,1J+3ugp&
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publicvoid setIndexes(int[] indexes){ wcDHx#~
this.indexes = indexes; U>PF#@ C/
} %%5K%z,R#
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publicint getStartIndex(){ g).k+
return startIndex; NZ`Mq
} Ss ;C1:
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publicvoid setStartIndex(int startIndex){ =
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if(totalCount <= 0) 5:ca6H
this.startIndex = 0; MDI[TNYG
elseif(startIndex >= totalCount) $n>|9(K8
this.startIndex = indexes aMI\gCB/
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[indexes.length - 1]; #Q320}]{
elseif(startIndex < 0) lt%bGjk
this.startIndex = 0; KFd !wZ@e
else{ >5G2!Ns'
this.startIndex = indexes :y#KR\T1
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[startIndex / pageSize]; kH$)0nK
} 2\
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} =73""ry
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publicint getNextIndex(){ mqPV
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int nextIndex = getStartIndex() + NgH"jg-
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pageSize; v"x{oD$R
if(nextIndex >= totalCount) qgTN %%"~
return getStartIndex(); D4jf%7X!Lu
else w
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return nextIndex; 7kbeAJ+{
} erG@8CG
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publicint getPreviousIndex(){ n- cEa/g
int previousIndex = getStartIndex() - e>"/Uii
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pageSize; WR;"^<i9
if(previousIndex < 0) ("HT0a
return0; [p3)C<;ZC
else N[G<&f9
return previousIndex; \ dpsyc
} xxnMvL;
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} gm;6v30e
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抽象业务类 pfCNFF*"
java代码: adEcIvN$
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/** <&&xt
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* Created on 2005-7-12 =1D* JU
*/ \qPgQsy4
package com.javaeye.common.business; G~Oj}rn
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import java.io.Serializable; qG S]2KY
import java.util.List; "WKE%f
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import org.hibernate.Criteria; _J}vPm
import org.hibernate.HibernateException; #^IEQZgH
import org.hibernate.Session; ~O{sOl
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import org.hibernate.criterion.DetachedCriteria; ^FLuhLS\*
import org.hibernate.criterion.Projections; Q^qG=
import Y4PU~l
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org.springframework.orm.hibernate3.HibernateCallback; |0Kj0u8T
import z_XI,u}
&HKrmFgX{
org.springframework.orm.hibernate3.support.HibernateDaoS h%kB>E~
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upport; h[d|y_)f
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import com.javaeye.common.util.PaginationSupport; h~$Q\WCm#
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public abstract class AbstractManager extends 7{oG4X!
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HibernateDaoSupport { htg+V-,
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privateboolean cacheQueries = false; UQz8":#V
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privateString queryCacheRegion; _96hw8
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publicvoid setCacheQueries(boolean x9PEYhL?
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cacheQueries){ v~73
this.cacheQueries = cacheQueries; 5Am*1S^
} $UlA_l29
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publicvoid setQueryCacheRegion(String RB'12^[
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queryCacheRegion){
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this.queryCacheRegion = 1 'EMYQ
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queryCacheRegion; 1N<)lZl)
} d87pQ3e:&
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publicvoid save(finalObject entity){ D@H'8C\
getHibernateTemplate().save(entity); Y=/3_[G
} *>.~f<V
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publicvoid persist(finalObject entity){ %V;k/w~[
getHibernateTemplate().save(entity); &..![,)w^!
} NWB/N*
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publicvoid update(finalObject entity){ C78d29
getHibernateTemplate().update(entity); ^sH1YE}0
} =1n>vUW+J
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publicvoid delete(finalObject entity){ kYs2AzS{d
getHibernateTemplate().delete(entity); hmkcWr`
} <2y~7h:
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publicObject load(finalClass entity, r jU $*+
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finalSerializable id){ *cTN5S>
return getHibernateTemplate().load N|q:wyS|
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(entity, id); fE)+9!
} s4SR6hBO
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publicObject get(finalClass entity, ?Z!itB~
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finalSerializable id){ gzzPPd,hd
return getHibernateTemplate().get c#9 zw[y-L
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(entity, id); &nPv%P,e
} =KT7ZSTV
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publicList findAll(finalClass entity){ :[(X!eP
return getHibernateTemplate().find("from z[qM2
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" + entity.getName()); @]*z!>1
} 0e8)*2S
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publicList findByNamedQuery(finalString 6?}8z
q[
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namedQuery){ Jb $PlOQ
return getHibernateTemplate OAw/
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().findByNamedQuery(namedQuery); /[nt=#+
} J+?xfg
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publicList findByNamedQuery(finalString query, Kr]!BI?z
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finalObject parameter){ 3 ;.{
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return getHibernateTemplate Jc9SHCJ
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().findByNamedQuery(query, parameter); 5
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} 2%vwC]A
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publicList findByNamedQuery(finalString query, "hog A5=
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finalObject[] parameters){ pS%,wjb&P
return getHibernateTemplate )Y?Hf2']
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().findByNamedQuery(query, parameters); ,\}V.:THF
} ;5y4v
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publicList find(finalString query){ 3CQpe
return getHibernateTemplate().find @292;qi
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(query); W,Dr2$V
} i8HSYA
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publicList find(finalString query, finalObject "P<~bw5
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parameter){ [+GQ3Z\
return getHibernateTemplate().find >wcsJ{I
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(query, parameter); |BYD] vK
} E?Q=#+}U
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public PaginationSupport findPageByCriteria b@,=;Y)O
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(final DetachedCriteria detachedCriteria){ RSmxwx^
return findPageByCriteria MiOSSl};
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); B0Z*YsbXL
} L4kYF~G:4
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public PaginationSupport findPageByCriteria 5+3Z?|b
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(final DetachedCriteria detachedCriteria, finalint RFA5vCG
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startIndex){ 8-8=
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return findPageByCriteria #On1Q:d
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(detachedCriteria, PaginationSupport.PAGESIZE, 4TR:bQZs
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startIndex); )sNtwSl^
} U?|s/U
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public PaginationSupport findPageByCriteria N;[w`d'#
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(final DetachedCriteria detachedCriteria, finalint l^0
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pageSize, QT%&vq
finalint startIndex){ &]z2=\^e
return(PaginationSupport) |u;5|i
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getHibernateTemplate().execute(new HibernateCallback(){ ~=c^Oo:
publicObject doInHibernate 9pjk3a
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(Session session)throws HibernateException { /Zv }u
Criteria criteria = GB[W'QGiq
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detachedCriteria.getExecutableCriteria(session); M>I}^Zp!
int totalCount = +%gh?
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((Integer) criteria.setProjection(Projections.rowCount ]Uxx_1$,
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()).uniqueResult()).intValue(); .+[[m$J
criteria.setProjection ]m}>/2oSs
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(null); _&w!JzpXT
List items = 1uy+'2[Z-D
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criteria.setFirstResult(startIndex).setMaxResults {n1o)MZ]R
'mmyzsQ\6
(pageSize).list(); o-)E_X
PaginationSupport ps = iSFgFJG^
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new PaginationSupport(items, totalCount, pageSize, -@#AQ\
9U;) [R Mb
startIndex); Q6vkqu5!=
return ps; 5Vvy:<.la
}
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}, true); s@3!G+ -}
} sHEISNj/^
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public List findAllByCriteria(final yr;oq(&N
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DetachedCriteria detachedCriteria){ #vS>^OyP
return(List) getHibernateTemplate 3d,|26I 7f
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().execute(new HibernateCallback(){ E|^a7-}|
publicObject doInHibernate 9'4cqR
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(Session session)throws HibernateException { R(q
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Criteria criteria = 7z+NR&'M$
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detachedCriteria.getExecutableCriteria(session); ,e,fOL
return criteria.list(); LTa9'
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} vO&1F@
}, true); Fir7z nRW
} MOOL=Um3
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public int getCountByCriteria(final p$"*U[%l
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DetachedCriteria detachedCriteria){ Pp.X Du
Integer count = (Integer) HWs?,AJNxB
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getHibernateTemplate().execute(new HibernateCallback(){ ("9)=x *5
publicObject doInHibernate o\2#}eie
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(Session session)throws HibernateException { b1s1;8 Q
Criteria criteria = 6w@l#p
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detachedCriteria.getExecutableCriteria(session); %Y!lEzB5
return Y*7.3 +#
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criteria.setProjection(Projections.rowCount hy6px
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()).uniqueResult(); Mv;7kC7]
} [(dAv7YbN
}, true); .UJDn^@
return count.intValue(); |:EUh
} Y#rao:I
} l[h??C`
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用户在web层构造查询条件detachedCriteria,和可选的 HF0J>Clq
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 7,
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PaginationSupport的实例ps。 .-<o[(s
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ps.getItems()得到已分页好的结果集 Z4rK$B
ps.getIndexes()得到分页索引的数组 =MoPOib\n
ps.getTotalCount()得到总结果数 8# 9.a]AX
ps.getStartIndex()当前分页索引 t4 aa5@r
ps.getNextIndex()下一页索引 ThFI=K
ps.getPreviousIndex()上一页索引 OvQG%D}P=
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 RX#:27:
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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 (Kx3:gs
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一下代码重构了。 )2:d8J\
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我把原本我的做法也提供出来供大家讨论吧: y5oiH
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首先,为了实现分页查询,我封装了一个Page类: C/lpSe
java代码: H!7/U_AH
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/*Created on 2005-4-14*/ a N_M
package org.flyware.util.page; ,Y}HP3
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/** Vbz$dpT
* @author Joa *n}{)Ef
* >a]{q^0
*/ X$J
publicclass Page { d+z8^$z"
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/** imply if the page has previous page */ l? 7D0
privateboolean hasPrePage; d)9=hp;,V
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/** imply if the page has next page */ ,@(lYeD"
privateboolean hasNextPage; z!?xz
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/** the number of every page */ |"\A5v|1
privateint everyPage; 4fp}`U
@7.Ews5Mke
/** the total page number */ !~PV\DQN
privateint totalPage; vr2t MD
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/** the number of current page */ .y|*
privateint currentPage; A)'{G
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/** the begin index of the records by the current b$%W<D
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query */ ig jr=e
privateint beginIndex; G4]T
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/** The default constructor */ ZC@Pfba[`
public Page(){ <D!"<&N