Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 d4]9oi{}
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 'U8% !
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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 ^o@N.+`&<
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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 JPq2C\Ka
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分页支持类: {0t-Q k
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java代码: j$u=7Z&E
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package com.javaeye.common.util; PAUepO_
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import java.util.List; h jCkj(b
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publicclass PaginationSupport { R
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publicfinalstaticint PAGESIZE = 30; (Q /Kp*a
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privateint pageSize = PAGESIZE; {@7{!I|eD
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privateList items; >cE@m=[
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privateint totalCount; *t-Wol
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privateint[] indexes = newint[0]; 13X\PO'9
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privateint startIndex = 0; *NEA(9
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public PaginationSupport(List items, int -x)zyq6
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totalCount){ zv%9?:
setPageSize(PAGESIZE); s:fy
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setTotalCount(totalCount); P0 va=H
setItems(items); "{&?t}rj+
setStartIndex(0); 0bt"U=x4
} 9P M\D@A{
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public PaginationSupport(List items, int =(-oQ<@v
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totalCount, int startIndex){ !RJuH;8
setPageSize(PAGESIZE); yHka7D
setTotalCount(totalCount); wj'5D0
setItems(items); {);S6F$[3
setStartIndex(startIndex); O'OVj
} ^Iz(V2
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public PaginationSupport(List items, int b\dzB\,&
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totalCount, int pageSize, int startIndex){ F_?aoP&5
setPageSize(pageSize); (q@DBb4
setTotalCount(totalCount); 'rX!E,59
setItems(items); ')8c
setStartIndex(startIndex); SG)hrd
} RJz$$,RU
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publicList getItems(){ T/A[C
return items; POl[]ni=>
} QNk\y@yKw
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publicvoid setItems(List items){ &6yh4-(7
this.items = items; U1Z.#ETnM
} \G!TC{6
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publicint getPageSize(){ exnFy-
return pageSize; vp4l g1/
} }=+J&cR
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publicvoid setPageSize(int pageSize){ }AZ0BI,TI
this.pageSize = pageSize; aWG7k#nE
} A`Nk gVq5:
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publicint getTotalCount(){ s Y^#I
return totalCount; &at^~o
} ;{zgp
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publicvoid setTotalCount(int totalCount){ 3kAhvL
if(totalCount > 0){ KKPQ[3g
this.totalCount = totalCount; /4]<ro67E6
int count = totalCount / e~NEyS~3
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pageSize; x8#bd{
if(totalCount % pageSize > 0) V*uoGWL]+
count++; [SFX;v!9
indexes = newint[count]; oi@/H\7j
for(int i = 0; i < count; i++){ vS!%!-F
indexes = pageSize * lji&]^1
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} WSt&?+Y
}else{ 3C+!Y#F
this.totalCount = 0; {z4v_[-2CF
} 9]{(~=D7
} |wnXBKV(
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publicint[] getIndexes(){ &2~c,] 9C
return indexes; 6`ZHFem
} w?r
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publicvoid setIndexes(int[] indexes){ q_h=O1W
this.indexes = indexes; xnBU)#<]S
} 6AM-^S@
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publicint getStartIndex(){ b5-W K;
return startIndex; [>rX/a%c
} [&tN(K9*
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publicvoid setStartIndex(int startIndex){ CJ@G8>
if(totalCount <= 0) >uu]K
this.startIndex = 0; F%Xj'=
elseif(startIndex >= totalCount) &!kD81?Mm
this.startIndex = indexes ]M:=\h,t>
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[indexes.length - 1]; ;tBc&LJ?
elseif(startIndex < 0) h{J=Rq
this.startIndex = 0; 8Pkw'.r
else{ ^}F @*A;o
this.startIndex = indexes o7qZy |\4S
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[startIndex / pageSize]; 3 NLC~CJ
} f
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} #QWG5
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publicint getNextIndex(){ ._ 6|epJ#
int nextIndex = getStartIndex() + )kBN]>&R
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pageSize; 1 2Lc$\3P
if(nextIndex >= totalCount) eJ=K*t|
return getStartIndex(); 9XH}/FcP_O
else rJ@yOed["b
return nextIndex; w2o%{n\L
} =GP~h*5es
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publicint getPreviousIndex(){ |i}5vT78
int previousIndex = getStartIndex() - &!adW@y
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pageSize; @CxXkR
if(previousIndex < 0) ]0g$3
return0; "K!9^!4&
else kVH^(Pi
return previousIndex; T|/B}srm
} h
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} ]+OHxCj:
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抽象业务类 ranlbxp2l
java代码: [pc6!qhDG&
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/** P ]prrKZe,
* Created on 2005-7-12 b{Qg$ZJeR
*/ #?V7kds]
package com.javaeye.common.business; G;'=#c
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import java.io.Serializable; )=PmHUd
import java.util.List; ff1Em.
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import org.hibernate.Criteria; DaK2P;WP
import org.hibernate.HibernateException; x c[BQ|P=
import org.hibernate.Session; ]Zj6W9]m
import org.hibernate.criterion.DetachedCriteria; ^EG@tB $<
import org.hibernate.criterion.Projections; iJr 1w&GL$
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org.springframework.orm.hibernate3.HibernateCallback; #Is/j =
import >o#^)LN
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org.springframework.orm.hibernate3.support.HibernateDaoS {|jrYU.k~
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upport; QIcg4\d%s
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import com.javaeye.common.util.PaginationSupport; !OO{qw(*g
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public abstract class AbstractManager extends .ZB/!WiF
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HibernateDaoSupport { VgoN=S
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privateboolean cacheQueries = false; B!#F!Wk"
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privateString queryCacheRegion; 7n_'2qY
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publicvoid setCacheQueries(boolean ,IODV`L
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cacheQueries){ ;M95A
this.cacheQueries = cacheQueries; w^.^XK4v.
} 5T,In+~Kd
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publicvoid setQueryCacheRegion(String "n4' \ig
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queryCacheRegion){ bhIyq4N
this.queryCacheRegion = vbZGs7%
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queryCacheRegion; 0%m}tfQ5
} z_jTR[dY
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publicvoid save(finalObject entity){ ,sM>{NK9R
getHibernateTemplate().save(entity); e>ZF? (a0
} !Gphs`YI
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publicvoid persist(finalObject entity){ =Wl*.%1 b
getHibernateTemplate().save(entity); TtL2}Wdd.%
} ]Q\Ogfjp
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publicvoid update(finalObject entity){ ;Yrg4/Ipa
getHibernateTemplate().update(entity); dqMR<Nl&
} H=vrF - #
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publicvoid delete(finalObject entity){ i<g|+}I
getHibernateTemplate().delete(entity); ?VMj;+'tr
} (}Ql#q
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publicObject load(finalClass entity, (/&IBd-
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finalSerializable id){ ]E66'
return getHibernateTemplate().load j+3~
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(entity, id); khl(9R4a
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publicObject get(finalClass entity, pRtxyL"y
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finalSerializable id){ i0uBb%GMT
return getHibernateTemplate().get 0s = h*"[
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(entity, id); L<>;E
} 40pGu
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publicList findAll(finalClass entity){ Fzk
return getHibernateTemplate().find("from pmyHto"
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" + entity.getName()); lgZ3=h
} eI?<*
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publicList findByNamedQuery(finalString 8uoFV=bj\
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namedQuery){ C
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return getHibernateTemplate &I.UEF2,
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().findByNamedQuery(namedQuery); 0SV#M6`GX
} [~bfM6Jw
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publicList findByNamedQuery(finalString query, P}o:WI4.cB
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finalObject parameter){ 2O {@W +Mt
return getHibernateTemplate )W'l^R4W
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}
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publicList findByNamedQuery(finalString query, PYqx&om
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finalObject[] parameters){ ^~0Mw;n&
return getHibernateTemplate 4EzmH)4G
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().findByNamedQuery(query, parameters); $j^Jj
} .]%PnJM9K
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publicList find(finalString query){ &|u
return getHibernateTemplate().find )JE;#m0q
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(query); oD_je~b)
} W-@A
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publicList find(finalString query, finalObject u&`7 C
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parameter){
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return getHibernateTemplate().find Q,Vv
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(query, parameter); 8 s!0Z1Roc
} jdQ`Y+BC
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public PaginationSupport findPageByCriteria F{ J>=TC
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(final DetachedCriteria detachedCriteria){ npg.*I/>
return findPageByCriteria $6h:j#{JE
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); lDO9GNz$
} OBi9aFoQ
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public PaginationSupport findPageByCriteria mq$'\c
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(final DetachedCriteria detachedCriteria, finalint t>f<4~%MJ
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startIndex){ WM NcPHcj
return findPageByCriteria 8I$B^,N
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(detachedCriteria, PaginationSupport.PAGESIZE, ?1i>b->
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startIndex); q17c)]<"
} 1Vt7[L*
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public PaginationSupport findPageByCriteria CE-ySIa
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(final DetachedCriteria detachedCriteria, finalint [ jve
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finalint startIndex){ X0J@c "%0
return(PaginationSupport) h<\o[n7j
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getHibernateTemplate().execute(new HibernateCallback(){ !YSAQi ;I
publicObject doInHibernate ~"!F&
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(Session session)throws HibernateException { RK#e7
Criteria criteria = g4!zH};n
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detachedCriteria.getExecutableCriteria(session); F.ryeOJ
int totalCount = Lgpj<H[
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((Integer) criteria.setProjection(Projections.rowCount =K .' x
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()).uniqueResult()).intValue(); ]h~=lItTRZ
criteria.setProjection 1uz9zhG><
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(null); x:b0G
List items = @4Z>;
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criteria.setFirstResult(startIndex).setMaxResults ."l@aE=|
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(pageSize).list(); ;!DUN zl
PaginationSupport ps = ,Y=r]
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new PaginationSupport(items, totalCount, pageSize, hc2[,Hju{O
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startIndex); )(TaVHJR
return ps; S9J<3
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}, true); ZXljCiNn+\
} 5 :6^533]
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public List findAllByCriteria(final BusD}9QqB
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DetachedCriteria detachedCriteria){ s t P~/}
return(List) getHibernateTemplate ?Q[uIQ?dV
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().execute(new HibernateCallback(){ SY>i@s+ML
publicObject doInHibernate &!]$#
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(Session session)throws HibernateException { F2]v]]F!
Criteria criteria = ^;@q^b)ZP
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detachedCriteria.getExecutableCriteria(session); K,bv\j;f
return criteria.list(); wv<D%nF2|
} 5:/
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}, true); $cEl6(66iX
} m5Q,RwJ!xK
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public int getCountByCriteria(final wx nD3
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DetachedCriteria detachedCriteria){ '; ,DgR;'
Integer count = (Integer) _*h,,Q
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getHibernateTemplate().execute(new HibernateCallback(){ (g
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publicObject doInHibernate 0ohpJh61Q
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(Session session)throws HibernateException { <DP_`[+C
Criteria criteria = ojU:RRr4l$
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detachedCriteria.getExecutableCriteria(session); (m80isl
return e}y oy+9
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criteria.setProjection(Projections.rowCount 0gO<]]M?
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()).uniqueResult(); uN20sD}
} m6tbN/EJZ
}, true); VXXo\LQUU
return count.intValue(); =G3O7\KmH
} Jaz|b`KDj
} B?9K! c
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用户在web层构造查询条件detachedCriteria,和可选的 2*Hw6@Jj
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 }ozlED`E
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PaginationSupport的实例ps。 u}Vc2a,WV
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ps.getItems()得到已分页好的结果集 /3->TS
ps.getIndexes()得到分页索引的数组 h1@|UxaE#
ps.getTotalCount()得到总结果数 p>4$&-
ps.getStartIndex()当前分页索引 3kFSu
ps.getNextIndex()下一页索引 uqwB`<>KJ
ps.getPreviousIndex()上一页索引 y>wrm:b-O
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 k_%2Ok
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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 +;~JHx.~X
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一下代码重构了。 ofbNg_K>
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我把原本我的做法也提供出来供大家讨论吧: @k:f(c
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首先,为了实现分页查询,我封装了一个Page类: 2`>/y
java代码: 7NC"}JB&
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/*Created on 2005-4-14*/ }R-eQT
package org.flyware.util.page; wuE] ju<
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/** e^kccz2f
* @author Joa ^|y6oj
* <,p|3p3
*/ N),bhYS]
publicclass Page { *KNj5>6=
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/** imply if the page has previous page */ )&:4//}a
privateboolean hasPrePage; +7n;Bsk
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/** imply if the page has next page */ Pk/{~!+
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privateboolean hasNextPage; wY|&qX,
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/** the number of every page */ "?EoYF_
privateint everyPage; gTWl];xja
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/** the total page number */ ZN>oz@jY
privateint totalPage; ?"f\"N
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/** the number of current page */ C9zQ{G
privateint currentPage; j`jF{k b
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/** the begin index of the records by the current z%cq%P8g
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query */ k(1]!c4J0
privateint beginIndex; ]la8MaZ<