Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 U085qKyCw
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 \IY)2C<e
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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 p~1,[]k
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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 YGrmco?G
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分页支持类: ]0P-?O:
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java代码: Bv,u kQ\CH
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package com.javaeye.common.util; TNBFb_F
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import java.util.List; yiyyw,iy
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publicclass PaginationSupport { INrl^P*
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publicfinalstaticint PAGESIZE = 30; [FLRrTcE
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privateint pageSize = PAGESIZE; l1}=>V1
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privateList items; _YzItge*
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privateint totalCount; F
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privateint[] indexes = newint[0]; kQ4-W9u
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privateint startIndex = 0; 9`4mvK/@
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public PaginationSupport(List items, int
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totalCount){ Lf _`8Ux
setPageSize(PAGESIZE); 8_0j^oh
setTotalCount(totalCount); wN/d
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setItems(items); o>x*_4[
setStartIndex(0); r@L19d)J
} Q?Vq/3K;
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public PaginationSupport(List items, int nxH=Ut7{
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totalCount, int startIndex){ -U;2
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setPageSize(PAGESIZE); uPbvN[~t
setTotalCount(totalCount); dr3#?%
setItems(items); 5{cbcuG
setStartIndex(startIndex); i-Ck:-J
} 4Z>KrFO
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public PaginationSupport(List items, int Dp|y&x!
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totalCount, int pageSize, int startIndex){ u50 o1^<X
setPageSize(pageSize); yVd}1bX
setTotalCount(totalCount); 27q9zi!Q
setItems(items); R}lS@ w1
setStartIndex(startIndex); lN$#lyy
} Dd8*1,
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publicList getItems(){ 6|gC##T
return items; dcUaZfON
} W/COrgbW
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publicvoid setItems(List items){ cLl=?^DB
this.items = items; K#q1/2
} Ft)7Wx"
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publicint getPageSize(){ M]&F1<
return pageSize; Xy[O
} ) jBPt&
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publicvoid setPageSize(int pageSize){ ximW!y7
this.pageSize = pageSize; b
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} 9xL8 ];-
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publicint getTotalCount(){ tA'O66.
return totalCount; iX4?5yz~<
} &u)
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publicvoid setTotalCount(int totalCount){ 'J(rIH3U
if(totalCount > 0){ O ;,BzA-n
this.totalCount = totalCount; $g? ]9}p
int count = totalCount / 1fwjW0t
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pageSize; H4DM,.04
if(totalCount % pageSize > 0) 7=yV8.cD
count++;
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indexes = newint[count]; *@6,Sr)_
for(int i = 0; i < count; i++){ f5p>oXo4b
indexes = pageSize * r}>8FE9S'H
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} KLVkPix;$
}else{ wyF'B
this.totalCount = 0; 49S*f
} GG0l\!2)
} 0X6|pC~
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publicint[] getIndexes(){ 9K~0:c
return indexes; h/`]=kCl
} xZ'-G6O
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publicvoid setIndexes(int[] indexes){ :iW+CD)j
this.indexes = indexes; ~*aPeJ
} !EO*xxQ
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publicint getStartIndex(){ s|*0cK!K^
return startIndex; L9(mY `d>"
} cE(P^;7D
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publicvoid setStartIndex(int startIndex){ FKhmg&+>
if(totalCount <= 0) !h\.w9o[
this.startIndex = 0; b
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elseif(startIndex >= totalCount) kw,eTB<;R
this.startIndex = indexes VRe7Q0
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[indexes.length - 1]; @)[Q6w`x
elseif(startIndex < 0) RsTz3]`yv
this.startIndex = 0; bs_>!H1
else{ 4^4<Le-G
this.startIndex = indexes Udj!y$?
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[startIndex / pageSize]; 3<Qe'd
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} NXwthc3
} \YXzq<7
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publicint getNextIndex(){ T!-*; yu
int nextIndex = getStartIndex() + <%d/"XNg[D
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pageSize; T!![7Rs
if(nextIndex >= totalCount) c~1+5&
return getStartIndex(); 0PfjD
else '0\,waEu
return nextIndex; Uk@du7P1k
} 0j{Rsy
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publicint getPreviousIndex(){ JATW'HWC|I
int previousIndex = getStartIndex() - dJvT2s.t[
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pageSize; 2bu,_<K.
if(previousIndex < 0) l', +l{\Z
return0; <V[Qs3uo(
else 1Ce7\A
return previousIndex; Z5x&P_.x[
} b'x26wT?
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} dnEIR5%+.
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抽象业务类 z@za9U`6i
java代码: n 0/<m.
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/** pCacm@(hG
* Created on 2005-7-12 +(Q$GO%
*/ _?VMSu
package com.javaeye.common.business; g:dtfa/]
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import java.io.Serializable; N.~zQVO#R
import java.util.List; -hd@<+;E
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import org.hibernate.Criteria; pL [JGn
import org.hibernate.HibernateException; \&!qw[;O
import org.hibernate.Session; RpmOg
import org.hibernate.criterion.DetachedCriteria; Py@/\V
import org.hibernate.criterion.Projections; X}V}%
import gWK[%.Jnw
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org.springframework.orm.hibernate3.HibernateCallback; pY~/<lzW
import jw 4B^2}
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org.springframework.orm.hibernate3.support.HibernateDaoS Zk:Kux[7
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upport; mJU1n
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import com.javaeye.common.util.PaginationSupport; *\$m1g7b
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public abstract class AbstractManager extends Q[n*ce7L0
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HibernateDaoSupport { f(Su
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privateboolean cacheQueries = false; >TQNrS^$J
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privateString queryCacheRegion;
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publicvoid setCacheQueries(boolean aPToP.e
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cacheQueries){ <q`'[1Y4
this.cacheQueries = cacheQueries; 7Gwo:s L
} 5+DId7d'n
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publicvoid setQueryCacheRegion(String e,K.bgi
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queryCacheRegion){ /R(]hmW
this.queryCacheRegion = xYd]|y
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queryCacheRegion; "@^^niSFl
} Ga]\~31NE
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publicvoid save(finalObject entity){ 4{lrtNd~K
getHibernateTemplate().save(entity); ^TZ`1:oL#
} ;Yve m
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publicvoid persist(finalObject entity){ xNd p]u
getHibernateTemplate().save(entity); Oq9E$0JW
} B&+)s5hh
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publicvoid update(finalObject entity){ ?E}9TQ
getHibernateTemplate().update(entity); 0-Ga2Go9
} =91wC
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publicvoid delete(finalObject entity){ kNd(KQ<.17
getHibernateTemplate().delete(entity); ^wIg|Gc
} i5 0c N<o
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publicObject load(finalClass entity, z&c|2L-u6
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finalSerializable id){ *x-@}WY$U
return getHibernateTemplate().load /O}lSXo6E
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(entity, id); <MyT ;
} j Gp&P
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publicObject get(finalClass entity, 3y%,f|ju
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finalSerializable id){ Al1}Ir
return getHibernateTemplate().get tbXl5x0
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(entity, id); 8F
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} 2Krh&
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publicList findAll(finalClass entity){ C
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return getHibernateTemplate().find("from g#q7~#9
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" + entity.getName()); U4NH9-U'
} YuUJgt .1
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publicList findByNamedQuery(finalString 7J;\&q'
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namedQuery){ <Uy $b4h
return getHibernateTemplate M%YxhuT0
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().findByNamedQuery(namedQuery); n-u
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} $ ~%w21?&
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publicList findByNamedQuery(finalString query, USg,=YM
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finalObject parameter){ $|tk?Sps
return getHibernateTemplate rI OKCL?
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().findByNamedQuery(query, parameter); . {vMn0c
} VXnWY8\
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publicList findByNamedQuery(finalString query, t2Px?S?
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finalObject[] parameters){ wBJ|%mc3TA
return getHibernateTemplate R"yxpw
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().findByNamedQuery(query, parameters); rvacCwI
} P(UY}oU
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publicList find(finalString query){ CofTTYl
return getHibernateTemplate().find 3a[ LM!
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(query); l{gR6U{e
} Kk,u{EA
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publicList find(finalString query, finalObject # w@FBFr@
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parameter){ YwS/O N
return getHibernateTemplate().find &Oc
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(query, parameter); -,Js2+QZ#
} ~z(0XKq0d
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public PaginationSupport findPageByCriteria %d%FI"!K
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(final DetachedCriteria detachedCriteria){ ?OPuv5!pI
return findPageByCriteria |~@yXc5a
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); V,%K"b=
} vJ{F)0 K
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public PaginationSupport findPageByCriteria v
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(final DetachedCriteria detachedCriteria, finalint (f2r4Io|}
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startIndex){ 9C8 G(r
return findPageByCriteria di(H-=9G62
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(detachedCriteria, PaginationSupport.PAGESIZE, xSqr=^
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startIndex); 2*< PmKI
} o@hj.)u
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public PaginationSupport findPageByCriteria njaKU?6%d2
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(final DetachedCriteria detachedCriteria, finalint OrF.wcg
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pageSize, ?,]eN&`
finalint startIndex){ CED[\n
return(PaginationSupport) wA"d?x
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getHibernateTemplate().execute(new HibernateCallback(){ >X*G6p
publicObject doInHibernate 505ejO|
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(Session session)throws HibernateException { cE>m/^SKr
Criteria criteria = d+vAm3.Dg
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detachedCriteria.getExecutableCriteria(session); s)?GscPG!
int totalCount = /6F\]JwU
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((Integer) criteria.setProjection(Projections.rowCount V(XZ7<& {
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()).uniqueResult()).intValue(); ]0O3kiVQ
criteria.setProjection Q{5.;{/eC
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(null); H )>3c1
List items = lWH#/5`h
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criteria.setFirstResult(startIndex).setMaxResults ]t~'wL#Z
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(pageSize).list(); ,c0t#KgQ.
PaginationSupport ps = E3(o}O
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new PaginationSupport(items, totalCount, pageSize, +*Fe
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startIndex); EM@EB<pRX
return ps; H!6+x*P0
} (sI`FW_
}, true); hT,rcIkg:
} yJ`{\7Uqg
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public List findAllByCriteria(final ^O=G%de
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DetachedCriteria detachedCriteria){ M6 8foeeN
return(List) getHibernateTemplate L7n G5i
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().execute(new HibernateCallback(){ db=S*LUbl
publicObject doInHibernate , Y,^vzX6
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(Session session)throws HibernateException { BP l% SL
Criteria criteria = "LH!Trl@k
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detachedCriteria.getExecutableCriteria(session); f`*VNB`
return criteria.list(); WgG$ r
} )#1!%aQ
}, true); I;1)a4Xc4R
} 2ga8 G4dU
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public int getCountByCriteria(final ~{);Ab.9+
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DetachedCriteria detachedCriteria){ lWd@
Integer count = (Integer) ,jtaTG.>
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getHibernateTemplate().execute(new HibernateCallback(){ >)u{%@Rcy{
publicObject doInHibernate 8^D1u`
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(Session session)throws HibernateException { _yX.Apv]
Criteria criteria = fP6.
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detachedCriteria.getExecutableCriteria(session); ^ fyue~9u
return ,KD?kSIf
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criteria.setProjection(Projections.rowCount Fa\jVFIQ
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()).uniqueResult(); Vy| 4k2
} Ud2Tn*QmI
}, true); :bi(mX7t
return count.intValue(); WRA(k
} /u_9uJ"-K(
} l]#=I7 6
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用户在web层构造查询条件detachedCriteria,和可选的 Qca3{|r`
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startIndex,调用业务bean的相应findByCriteria方法,返回一个
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PaginationSupport的实例ps。 7&OJ8B/
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ps.getItems()得到已分页好的结果集 |Ldvfd
ps.getIndexes()得到分页索引的数组 qX; F+~
ps.getTotalCount()得到总结果数 l(-"rE
ps.getStartIndex()当前分页索引 `@WJ_-$#
ps.getNextIndex()下一页索引 g]c6_DMfb1
ps.getPreviousIndex()上一页索引 $o;c:Kh$$
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 : vx<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 -meY[!"X
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一下代码重构了。 c#`IF6qj
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我把原本我的做法也提供出来供大家讨论吧: vF pKkS343
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首先,为了实现分页查询,我封装了一个Page类: .pdcwd9
java代码: #$W0%7
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/*Created on 2005-4-14*/ ?8?vBkz~
package org.flyware.util.page; c0rU&+:Ry
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/** -Ah&|!/
* @author Joa DpQWh+WRy
* O^ui+44wp
*/ Xdl
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publicclass Page { 6>;OVX
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/** imply if the page has previous page */ W,[QK~
privateboolean hasPrePage; *)`PY4zF
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/** imply if the page has next page */ 5GgH6
privateboolean hasNextPage; ]4V1]
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/** the number of every page */ 3A[<LnKR^E
privateint everyPage; N{&Lo}6F
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/** the total page number */ 6OAEAIh
privateint totalPage; B:0oT
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/** the number of current page */ {^(uoB C/
privateint currentPage; j (Q#NFT7
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/** the begin index of the records by the current ~m,~;
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query */ )"hd"
privateint beginIndex; -y|']I^ &
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/** The default constructor */ CDXN%~0h
public Page(){ T0"nzukd
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} 7CSz
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/** construct the page by everyPage }$L1A
* @param everyPage Q_!tn*
* */ 2#3`[+g<n
public Page(int everyPage){ <H-kR\HF
this.everyPage = everyPage; MMC$c=4"
} QA;,/iw `
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/** The whole constructor */ FE{c{G<
public Page(boolean hasPrePage, boolean hasNextPage, `w`N5 !
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int everyPage, int totalPage, "v`q%(TA
int currentPage, int beginIndex){ mAGD qz>f
this.hasPrePage = hasPrePage; lo'#dpt<
this.hasNextPage = hasNextPage; Mp!1xx
this.everyPage = everyPage; 0zT-]0
this.totalPage = totalPage; Q&w_kz.
this.currentPage = currentPage; &~/g[\Y
this.beginIndex = beginIndex; 2RF3pIFrm
} [g<gu~
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/** rP2h9Cb
* @return X[H .t$w5A
* Returns the beginIndex. 7-n HPDp'
*/ 3`vKEThY)
publicint getBeginIndex(){ K@%T5M4j
return beginIndex; km5gO|V>m
} SqRM*Cf=
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/** mwsBj)
* @param beginIndex "=C~IW
* The beginIndex to set. :AFU5mR4&
*/ T ,!CDm$=
publicvoid setBeginIndex(int beginIndex){ @ NL<v-t
this.beginIndex = beginIndex; 2)\MxvfOh
} { pQJ.QI
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/** `AvK8Wh<+
* @return 5
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* Returns the currentPage. nvLdgu4P>
*/ <pa-C2Ky
publicint getCurrentPage(){ d}Guj/cx,
return currentPage; -AD`(b7q
} ohyq/u+y~A
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/** S^|`*%pq
* @param currentPage qzA_ ~=g
* The currentPage to set. $kHXt]fU
*/ 7t#Q8u?
publicvoid setCurrentPage(int currentPage){ wme#8/eUk
this.currentPage = currentPage; 4guR8 elM
} t\
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/** .o]I^3tfc
* @return "M/) LXn:0
* Returns the everyPage. cC/32SmY4
*/ sq(5k+y*J
publicint getEveryPage(){ rr\u)D#)
return everyPage; $M0l
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} y4|<+9<7
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/** >@cBDS<6R
* @param everyPage 8%YyxoCH
* The everyPage to set. M=ag\1S&ZF
*/
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publicvoid setEveryPage(int everyPage){ CMbID1M3
this.everyPage = everyPage; |.yS~XFJS
} _[(EsIqc(F
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/** nsXG@C S:
* @return ;/wH/!b
* Returns the hasNextPage.
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*/ 1BW 9,Xr
publicboolean getHasNextPage(){ ^q/$a2<4
return hasNextPage; 40`Qsv0#
} 6bjZW ~
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/** ik)u/r DW
* @param hasNextPage RdyKd_0`Q
* The hasNextPage to set. n/*" 2
*/ fH_l2b[-3@
publicvoid setHasNextPage(boolean hasNextPage){ UY({[?Se
this.hasNextPage = hasNextPage; `EvO^L
} J@<f*
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/** :%Iv<d<