Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 VZ9e~){xA
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 mSVX4XW<
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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 DzX6U[=
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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
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分页支持类: oT9XJwqnv
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java代码: +oxqS&$L
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package com.javaeye.common.util; \kua9bK
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import java.util.List; 7;$L&X
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publicclass PaginationSupport { VC_3 ll]vr
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publicfinalstaticint PAGESIZE = 30; =6"hj,[Q
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privateint pageSize = PAGESIZE; )VSGqYr#
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privateList items; g*"J10hyP
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privateint totalCount; j,gM+4V^
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privateint[] indexes = newint[0]; .q'FSEkMJ
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privateint startIndex = 0; 6 ^6uK
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public PaginationSupport(List items, int z~A(IQO
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totalCount){ p!rGPyGC
setPageSize(PAGESIZE); >E2WZHzd2
setTotalCount(totalCount); Hsux>+Q
setItems(items); 52q!zx E
setStartIndex(0); q(${jz4w
} K7d1(.
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public PaginationSupport(List items, int Ri%Of:zZ
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totalCount, int startIndex){ &`\kb2uep
setPageSize(PAGESIZE); ;Kq<',u~
setTotalCount(totalCount); n=#[Mi $Y
setItems(items); <iY 9cV|}3
setStartIndex(startIndex); S4uR\|
} #q^>qX
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public PaginationSupport(List items, int G41$oalQ1
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totalCount, int pageSize, int startIndex){
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setPageSize(pageSize); ./5MsHfbxt
setTotalCount(totalCount); sB*h`vs0T
setItems(items); JqH.QnKcv
setStartIndex(startIndex); u0$5Fd&X
} ]>]H:NEq
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publicList getItems(){ `(w kqa
return items; %CfTqbB
} _tg3%X]
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publicvoid setItems(List items){ OkO@BWL
this.items = items; 2[bR6 T89
} hF{mm(qyv
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publicint getPageSize(){ EzY
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return pageSize; b "AHw?5F
} v*T@<]f3j
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publicvoid setPageSize(int pageSize){ D-;43>yi<
this.pageSize = pageSize; ='l6&3X
} :Q%yW%St$
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publicint getTotalCount(){ 9DocId.
return totalCount; h?O%XnD
} %%-Tjw o
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publicvoid setTotalCount(int totalCount){ nqw*oLFQ
if(totalCount > 0){ Zq6ebj
this.totalCount = totalCount; i~M.F=I5
int count = totalCount / {UjIxV(J
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pageSize; ,hcBiL/
if(totalCount % pageSize > 0) {Ac3/UM/
count++; h: (l+jr
indexes = newint[count]; kv`3Y0R-"
for(int i = 0; i < count; i++){ QH56tQq
indexes = pageSize * VE+p&0
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} v+,
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}else{ {gq:sj>
this.totalCount = 0; Z{>Y':\?<
} z8MpE
} vN[m5)aT
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publicint[] getIndexes(){ i=+<7]Q
return indexes; 9=;g4I
} P|QnZ){
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publicvoid setIndexes(int[] indexes){ ;R-Q,aCM}
this.indexes = indexes; u=?P*Y/|W
} 'J<zVD}0
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publicint getStartIndex(){ =dJEcC_J
return startIndex; .m
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} N_~Wu
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publicvoid setStartIndex(int startIndex){ 4iB)oR
if(totalCount <= 0) Ay. q)
this.startIndex = 0; 2LK*Cv[
elseif(startIndex >= totalCount) UmHb-uk ;
this.startIndex = indexes ^*T{-U'
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[indexes.length - 1]; w+ )GM
elseif(startIndex < 0) 5L'@WB|{4u
this.startIndex = 0; ;{#M
else{ /t2<OU9
this.startIndex = indexes 4rCqN.J
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[startIndex / pageSize]; SOY#, Zu
} oZ>]8vw
} j-\^
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publicint getNextIndex(){ oA^
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int nextIndex = getStartIndex() + JL+[1=uE1L
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pageSize; t@mw f3,
if(nextIndex >= totalCount) 5+PBS)pJ]%
return getStartIndex(); (3HgI
else K0bmU(Xxp
return nextIndex; ~V)VGGOL$v
} &S`'o%B
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publicint getPreviousIndex(){ L
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int previousIndex = getStartIndex() - p~VW3u]
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pageSize; I.0Usa"z
if(previousIndex < 0) )qQg n]
return0; 1+[|pXT}
else 3B]+]e~
return previousIndex; BwA~*5TFu
} <i@jD
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} -|UX}t*
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抽象业务类 *" +cP!
java代码: rb4g<f|
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/** I>\?t4t
* Created on 2005-7-12 Tp.iRFFkP
*/ <Gt{(is
package com.javaeye.common.business; |L#r)$n{1
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import java.io.Serializable; J;9QDrl`
import java.util.List; `9NnL.w!
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import org.hibernate.Criteria; 23?0'AU
import org.hibernate.HibernateException; PW\FcT
import org.hibernate.Session; G(,~{N||
import org.hibernate.criterion.DetachedCriteria; lAt1Mq}?P
import org.hibernate.criterion.Projections; m.X+sP-e
import jtJ8r5j 1
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org.springframework.orm.hibernate3.HibernateCallback; fu;B ?mIn
import QE6-(/
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org.springframework.orm.hibernate3.support.HibernateDaoS ?a_q!,8:
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upport; !!pi\J?sk
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import com.javaeye.common.util.PaginationSupport; #GJh:#tt^
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public abstract class AbstractManager extends _^A
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HibernateDaoSupport { `^Sq>R!;
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privateboolean cacheQueries = false; soCHwiE
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privateString queryCacheRegion; c.> (/
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publicvoid setCacheQueries(boolean `)P_X4e]`
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cacheQueries){ S :|*wB
this.cacheQueries = cacheQueries; U6 R4UK
} *XR~fs?/*W
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publicvoid setQueryCacheRegion(String (NlEb'~+
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queryCacheRegion){ Z*B(L@H
this.queryCacheRegion = (KU@hp-\
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queryCacheRegion; +Ea XS
} X Y?@^
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publicvoid save(finalObject entity){ q{(&:~M
getHibernateTemplate().save(entity); &1Iy9&y
} B)NB6dCp
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publicvoid persist(finalObject entity){ K Hc +
getHibernateTemplate().save(entity); e4LNnJU\|
} QQcj"s
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publicvoid update(finalObject entity){ ^%^0x'"
getHibernateTemplate().update(entity); YtQWArX,
} N$b;8F
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publicvoid delete(finalObject entity){ 2"^9t1C2
getHibernateTemplate().delete(entity); k"c_x*f
} K>6p5*&
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publicObject load(finalClass entity, g>CQO,s;w
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finalSerializable id){ hgltD8,
return getHibernateTemplate().load Puh&F< B
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(entity, id); rpWy 6oD
} #+\G-
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publicObject get(finalClass entity, /ep~/#Ia
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finalSerializable id){ ]vErF=[U,
return getHibernateTemplate().get ';F][x 5j
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(entity, id); ) P])0Y-
} I-"{m/PEdg
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publicList findAll(finalClass entity){ Y6a|\K|
return getHibernateTemplate().find("from J_$~OEC~
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" + entity.getName()); }IL@j A
} tT:yvU@a
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publicList findByNamedQuery(finalString eW%jDsC
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namedQuery){ Tkf !Y?
return getHibernateTemplate yL-L2
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().findByNamedQuery(namedQuery); O/nS,Ux
} nt6"}vO
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publicList findByNamedQuery(finalString query, Y}Uw7\e
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finalObject parameter){ sn%fE
return getHibernateTemplate kF .b)
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().findByNamedQuery(query, parameter); 7(Kc9sJC%%
} 5$X{{j2
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publicList findByNamedQuery(finalString query, <5%We(3
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finalObject[] parameters){ J;dFmZOk
return getHibernateTemplate ;q2T*4NN
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().findByNamedQuery(query, parameters); Ok!{2$P8U9
} &@+;]t
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publicList find(finalString query){ "5K:"m
return getHibernateTemplate().find r^)<Jy0|r
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(query); ;Lu|fQ#u*
} \BW(c)Q
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publicList find(finalString query, finalObject /_\4(vvf
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parameter){ HFOp4
return getHibernateTemplate().find ^Tx1y[hw$
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(query, parameter); 4tjRju?
} Hw?
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public PaginationSupport findPageByCriteria Ai;Pht9qi
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(final DetachedCriteria detachedCriteria){ 2X`M&)"X
return findPageByCriteria Yi`.zm
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); "2J;~
} :nI.Qa'"H
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public PaginationSupport findPageByCriteria <3KrhhH
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(final DetachedCriteria detachedCriteria, finalint d<o
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startIndex){ =RA6 p
return findPageByCriteria z5I<,[`
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(detachedCriteria, PaginationSupport.PAGESIZE, q2y:bqLWl
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startIndex); aO1cd_d6x_
} gE1" .qC
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public PaginationSupport findPageByCriteria |dK-r
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(final DetachedCriteria detachedCriteria, finalint )8;'fE[p}
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pageSize, c1i7Rc{q
finalint startIndex){ (c"!0v
return(PaginationSupport) 0Ko,S(M_
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getHibernateTemplate().execute(new HibernateCallback(){ l-&f81W
publicObject doInHibernate dU,/!|.K
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(Session session)throws HibernateException { qF?S[Z;
Criteria criteria = <qBPN{'a"
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detachedCriteria.getExecutableCriteria(session); dn Xc- <
int totalCount = +] #>6/2q
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((Integer) criteria.setProjection(Projections.rowCount vd~O:=)4
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()).uniqueResult()).intValue(); 4[?Q*f!
criteria.setProjection ep5aBrN]"
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(null); wP%;9y2B
List items = <:?&}'aA
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criteria.setFirstResult(startIndex).setMaxResults f5N~K>
v [x`I;
(pageSize).list(); NoMC*",b>
PaginationSupport ps = jV(ISD
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new PaginationSupport(items, totalCount, pageSize, ^JTfRZ:a
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startIndex); bnlL-]]9z
return ps; *G9;d0
} (/%}a`2#o
}, true); m2;%|QE(
} |:\h3M
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public List findAllByCriteria(final JOMZ&c^
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DetachedCriteria detachedCriteria){ Z5\6ca
return(List) getHibernateTemplate 4AGc2e'u
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().execute(new HibernateCallback(){ f:TW<
publicObject doInHibernate ?mV[TM{p
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(Session session)throws HibernateException { ^C(AMT
Criteria criteria = _7Z$"
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detachedCriteria.getExecutableCriteria(session); L8V'mUyD
return criteria.list(); !o`al` q'
} vOqT Ld
}, true); {Z|C
} /:S.("Unv
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public int getCountByCriteria(final H:|yu
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DetachedCriteria detachedCriteria){ 2]@U$E='s
Integer count = (Integer) <Sz9: hg-
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getHibernateTemplate().execute(new HibernateCallback(){ 4EOu)#
publicObject doInHibernate k2xjcrg
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(Session session)throws HibernateException { MFC= oKD
Criteria criteria = (F
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detachedCriteria.getExecutableCriteria(session); zRe0z2
return b&LhydaJ
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criteria.setProjection(Projections.rowCount R)#"Ab Z'
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()).uniqueResult(); C ZJW`c/
} ddw!FH2W
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}, true); !XK p_v
return count.intValue(); &oT]ycz%
} tvd/Y|bV=
} *bR _
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用户在web层构造查询条件detachedCriteria,和可选的 le*pd+> j
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 towQoqv
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PaginationSupport的实例ps。 #*~#t4S-
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ps.getItems()得到已分页好的结果集 -1fT2e
ps.getIndexes()得到分页索引的数组 aa$+(
ps.getTotalCount()得到总结果数 HbCM{A9
ps.getStartIndex()当前分页索引 r=s7be
ps.getNextIndex()下一页索引 Z{%h6""
ps.getPreviousIndex()上一页索引 |`,%%p|T%
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 m,-:(82
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 J.~$^-&!
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一下代码重构了。 Cfa?LgSz
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我把原本我的做法也提供出来供大家讨论吧: ni9/7
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首先,为了实现分页查询,我封装了一个Page类: N'TL &]
java代码: ^ng?+X>mP
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/*Created on 2005-4-14*/ uZi]$/ic
package org.flyware.util.page; 75gE>:f
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/** 7v#sr<
* @author Joa BsRxD9r
* 'r3I/qg*m
*/ {G_ZEo#x8,
publicclass Page { )
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/** imply if the page has previous page */ XD9lox
privateboolean hasPrePage; )fv0H&g
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/** imply if the page has next page */ 2}t2k>
privateboolean hasNextPage; TN(1oJ:
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/** the number of every page */ m\[r6t]V
privateint everyPage; |6$6Za]:
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/** the total page number */ LY/K,6^a
privateint totalPage; /z`LB
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/** the number of current page */ 0zetOlFbO
privateint currentPage; nCJ)=P.d
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/** the begin index of the records by the current G|v{[>tr
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query */ ~gmj/PQ0
privateint beginIndex; ^lf{IM-Y
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/** The default constructor */ Fd9ypZs
public Page(){ dFK/
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} N
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/** construct the page by everyPage Q"S;r1 D
* @param everyPage Az{Z=:(0
* */ g&) XaF[!
public Page(int everyPage){ G)G5eXXX
this.everyPage = everyPage; UOi8>;k`
} "}Vow^vb
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/** The whole constructor */ &V:iy
public Page(boolean hasPrePage, boolean hasNextPage, gYw4YP0Gz
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int everyPage, int totalPage, 3a_~18W
int currentPage, int beginIndex){ Z~CL|=
this.hasPrePage = hasPrePage; s,)Z8H
this.hasNextPage = hasNextPage; 9s7sn*aB#5
this.everyPage = everyPage; M<4~ewWJ
this.totalPage = totalPage; 7X*$Fu<
this.currentPage = currentPage; tU.Y$%4
this.beginIndex = beginIndex; 7='lu;=,
} V'K1kYb
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/** <!EdND =
* @return Z.ky=vCt
* Returns the beginIndex. TFjb1a,)
*/ buu~#m1z
publicint getBeginIndex(){ &A)AV<=>T
return beginIndex; fucG 9B
} Q30AaG}f
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/** 5ro^<P0f**
* @param beginIndex |
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* The beginIndex to set. 3A!`U6C(
*/ YzNSZJPD
publicvoid setBeginIndex(int beginIndex){ Btp 9v<"
this.beginIndex = beginIndex; JvX]^t/}
} =dSH8C"
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/** b"DaLwKkz
* @return L3/m}AH,
* Returns the currentPage. F !g>fIg
*/ o'O;69D]tX
publicint getCurrentPage(){ 7&;M"?m&
return currentPage; 38#BINhBt
} MH7 n@.t
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/** #q#C_"
* @param currentPage Au~l
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* The currentPage to set. H]As2$[
*/ 8w/$!9[
publicvoid setCurrentPage(int currentPage){ W;!OxOWZJ
this.currentPage = currentPage; ;5Spdi4w
} uj;tmK>;
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/** pY]T32
* @return Mtq\xF,/+
* Returns the everyPage. 1k"<T7K
*/ |qTvy,U[
publicint getEveryPage(){ A:!_ &