Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 K/,lw~>
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ]1[;A$7
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 >lW*%{|b$^
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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 *3K"Kc2
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分页支持类: E)E!
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java代码: `+o.w#cl
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package com.javaeye.common.util; #50)D wD
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import java.util.List; j5O*H_D
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publicclass PaginationSupport { f)x}_dw%
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publicfinalstaticint PAGESIZE = 30; YM|S<
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privateint pageSize = PAGESIZE; 5!zvoX9
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privateList items; FudD
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privateint totalCount; (<X dj^v
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privateint[] indexes = newint[0]; N0[I2'^.
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privateint startIndex = 0; *"\Q ~#W
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public PaginationSupport(List items, int )X;cS}
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totalCount){ Ib8i#D V
setPageSize(PAGESIZE); %UQB?dkf$
setTotalCount(totalCount); eF^"{a3b
setItems(items); ';,Bn9rv
setStartIndex(0); O)uM&B=
} b6vYM_ Q
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public PaginationSupport(List items, int D!a5#+\C
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totalCount, int startIndex){ 4E\ntufo
setPageSize(PAGESIZE); F^t?*
setTotalCount(totalCount); dMmka
setItems(items); 7&1~O#
setStartIndex(startIndex); LIC~Kehi
} F}(QKO*
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public PaginationSupport(List items, int -5v.1y=!L
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totalCount, int pageSize, int startIndex){ zWs*kTtA
setPageSize(pageSize); }K80G~O2<
setTotalCount(totalCount); C'czXZtn
setItems(items); K6{bYho
setStartIndex(startIndex); (}1v^~FXj
} ob0 8xGj
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publicList getItems(){ O| J`~Lk
return items; U+PCvl=x
} /;NE]{K
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publicvoid setItems(List items){ `X<`j6zaG
this.items = items; n R\n\
} +'['HQ)
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publicint getPageSize(){ *rn]/w8ZW
return pageSize; noh|/sPMD
} { w8
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publicvoid setPageSize(int pageSize){ mvTyx7h=
this.pageSize = pageSize; ?D(FNd
} 3 "l
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publicint getTotalCount(){ jj3Pf>D+k
return totalCount; 'EL ||
} G&@-R{i
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publicvoid setTotalCount(int totalCount){ Q)G!Y
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if(totalCount > 0){ ]M~8@K
this.totalCount = totalCount; i<#h]o
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int count = totalCount / x[PEn
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pageSize; K}PvrcO1
if(totalCount % pageSize > 0)
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count++; /[Bl
indexes = newint[count]; {5QosC+o6Q
for(int i = 0; i < count; i++){ m3xz=9Ve
indexes = pageSize * |"CJ
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} :3a&Pb*PL
}else{ d&aBs++T
this.totalCount = 0; *CeQY M
} |?x^8e<*
} #
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publicint[] getIndexes(){ u?q&K|
return indexes; ZR/R'prW
} 3D
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publicvoid setIndexes(int[] indexes){ K4j@j}zK9I
this.indexes = indexes; DH\wDQ
} #04{(G|~+E
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publicint getStartIndex(){ MxY50^}(
return startIndex; lir&e
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} rGTWcJ
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publicvoid setStartIndex(int startIndex){ d@-wi%,^
if(totalCount <= 0) Sdgb#?MR|
this.startIndex = 0; sL)Rg(rkx
elseif(startIndex >= totalCount) uyL72($
this.startIndex = indexes UUl*f!&
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[indexes.length - 1]; jo_o`j
elseif(startIndex < 0) _kh>Z
this.startIndex = 0; &c20x+
else{ /r-8T>m
this.startIndex = indexes 4w@v#H@
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[startIndex / pageSize]; )j\r,9<K+5
} D2Y&[zgv
} *7\W=-
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publicint getNextIndex(){ 9QX4R<"wUg
int nextIndex = getStartIndex() + b 1cd&e
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pageSize; HP;|'b
if(nextIndex >= totalCount) Dft4isyt^
return getStartIndex(); ^ b@!dS
else L5/mO6;k
return nextIndex; 7O:"~L
} NNgK:YibD
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publicint getPreviousIndex(){ j13riI3A
int previousIndex = getStartIndex() - @2u#93Y
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pageSize; ?<E0zM+
if(previousIndex < 0) \OP9_J(*
return0; 0EyAMu
else q=njKC
return previousIndex; V+46R
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} mzu<C)9d,
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} oQ{cSThj
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抽象业务类 XwtAF3oz
java代码: B_cgWJ*4
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/** IYLZ
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* Created on 2005-7-12 \KCWYi]
*/ D!S8oKW
package com.javaeye.common.business; {d,?bs)
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import java.io.Serializable; 5~Q Tg
import java.util.List; l77'Lne
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import org.hibernate.Criteria; *y?[<2"$
import org.hibernate.HibernateException; H~eGgm;p
import org.hibernate.Session; }Bi@?Sb
import org.hibernate.criterion.DetachedCriteria; e+{BJN
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import org.hibernate.criterion.Projections; _CL{IY
import >O3IfS(l
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org.springframework.orm.hibernate3.HibernateCallback; :xtT)w
import >9MS"t
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org.springframework.orm.hibernate3.support.HibernateDaoS 5#2jq<D
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upport;
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import com.javaeye.common.util.PaginationSupport; ^obC4(
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public abstract class AbstractManager extends \FXp*FbQ
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HibernateDaoSupport { H nd+l)ng
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privateboolean cacheQueries = false; gs>A=A(VYf
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privateString queryCacheRegion; *E7R(#,yC
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publicvoid setCacheQueries(boolean x;(g
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cacheQueries){ d>/Tu_ y
this.cacheQueries = cacheQueries; fM2^MUp[=1
} Fpf><Rn
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publicvoid setQueryCacheRegion(String #D0 ~{H
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queryCacheRegion){ [8z&-'J=
this.queryCacheRegion = "k, K ~@}
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queryCacheRegion; T%~SM5
} 5k~\or 5_
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publicvoid save(finalObject entity){ ju.OW`GM
getHibernateTemplate().save(entity); U(Z!J6{c
} 37jQ'O
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publicvoid persist(finalObject entity){ R\y'_S=#a
getHibernateTemplate().save(entity); ckWkZ
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} cmIT$?J
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publicvoid update(finalObject entity){ 'kQ~
getHibernateTemplate().update(entity); 3.FR C
} (!-;T
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publicvoid delete(finalObject entity){ ib; yu_
getHibernateTemplate().delete(entity); [S) G$JW
} Xb0!( (A
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publicObject load(finalClass entity, i7s\CY
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finalSerializable id){ z{/LX
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return getHibernateTemplate().load xU:4Y0y8
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(entity, id); :~erh}~ps
} vnZ4(
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publicObject get(finalClass entity, xl9(ze
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finalSerializable id){ E|{m"RUOy
return getHibernateTemplate().get ])=H
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(entity, id); >>j+LRf*
} =Sa~\k+
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publicList findAll(finalClass entity){ 9cz )f\
return getHibernateTemplate().find("from B*2{M
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" + entity.getName()); &urb!tQ>&
} eVrNYa1>H
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publicList findByNamedQuery(finalString U&X.
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namedQuery){ r.?+gW!C
return getHibernateTemplate J+iX,X
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().findByNamedQuery(namedQuery); xY+A]Up|w
} H6{Rd+\Z
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publicList findByNamedQuery(finalString query, Lg b
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finalObject parameter){
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return getHibernateTemplate Rd0?zEKV
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().findByNamedQuery(query, parameter); sZT VM9<)
} 9c%(]Rn:
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publicList findByNamedQuery(finalString query, [|jIC
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finalObject[] parameters){ vRxL&8`&
return getHibernateTemplate h|)2'07
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().findByNamedQuery(query, parameters); Of!|,2`(
} 2AmR(vVa"
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publicList find(finalString query){ /1U,+g^O>
return getHibernateTemplate().find ]2g5Ka[>w
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(query); U24V55ZnI
} p<ry$=`
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publicList find(finalString query, finalObject *%;6P5n%
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parameter){ 6CCZda@
return getHibernateTemplate().find ">03~:oA
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(query, parameter); A5`#Ot*3
} P^i6MZ?
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public PaginationSupport findPageByCriteria }kpfJLjY
@?(nwj~ s`
(final DetachedCriteria detachedCriteria){ (8+.#1!*
return findPageByCriteria mOABZ#+Fk
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 9N`+ O
} zS#f%{
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public PaginationSupport findPageByCriteria g9RzzE!
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(final DetachedCriteria detachedCriteria, finalint ;F"
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startIndex){ /r #b
return findPageByCriteria ~7F EY0 /
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(detachedCriteria, PaginationSupport.PAGESIZE, +Y_Q?/M@8
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startIndex); i!/h3%=
} )of5229
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public PaginationSupport findPageByCriteria d|D'&&&c
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(final DetachedCriteria detachedCriteria, finalint (@N~ j&
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pageSize, 8VBkI Ygb
finalint startIndex){ o}j_eHl{
return(PaginationSupport) +3~Gc<OO
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getHibernateTemplate().execute(new HibernateCallback(){ J7&.>y1%
publicObject doInHibernate 9/8@
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(Session session)throws HibernateException { -Lz1#S k]A
Criteria criteria = pU'`9fLi_
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detachedCriteria.getExecutableCriteria(session); !<['iM
int totalCount = l72ie
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((Integer) criteria.setProjection(Projections.rowCount qU
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()).uniqueResult()).intValue(); " N`V*0h
criteria.setProjection '6Z/-V4k
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(null); Nsy9
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List items = ADwwiq#E
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criteria.setFirstResult(startIndex).setMaxResults 3<1HqU
+ - KRp1qq
(pageSize).list(); ;MdK3c
PaginationSupport ps = F6neG~Y
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new PaginationSupport(items, totalCount, pageSize, hnfrnYH
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startIndex); L}sm R,
return ps; kdueQ(\
} fAA@ziKg
}, true); 3!L<=X
} f^yLwRUD
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public List findAllByCriteria(final ]6c2[r?g{
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DetachedCriteria detachedCriteria){ S r#fyr
return(List) getHibernateTemplate b\uB
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().execute(new HibernateCallback(){ %+OPas8C
publicObject doInHibernate A"T. nqB^y
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(Session session)throws HibernateException { 7!QXh;u
Criteria criteria = H f mMf^c
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detachedCriteria.getExecutableCriteria(session); gt~2Br4
return criteria.list(); )^'B:ic
} pUEok +
}, true); ST[1'T+L
} "OAZ<
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public int getCountByCriteria(final aZ:?(u]
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DetachedCriteria detachedCriteria){ kp>Z /kt
Integer count = (Integer) |"E9DD]{
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getHibernateTemplate().execute(new HibernateCallback(){ '!L1z45
publicObject doInHibernate Ol5xyj
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(Session session)throws HibernateException { 7wEG<,D
Criteria criteria = < 3+&DV-<N
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detachedCriteria.getExecutableCriteria(session); hBSJEP
return Lj1 @yokB
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criteria.setProjection(Projections.rowCount 3kQ8*S
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()).uniqueResult(); M@@O50~
} )P+GklI{4
}, true); 'm? x2$u8
return count.intValue(); 2 3w{h d
} VIdoT2
} ~"0X,APR5
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用户在web层构造查询条件detachedCriteria,和可选的 l#.,wOO{
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 qyfxT Q5
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PaginationSupport的实例ps。 2/N*Uk 0
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ps.getItems()得到已分页好的结果集 !_!b\
ps.getIndexes()得到分页索引的数组 K8c#/o
ps.getTotalCount()得到总结果数 fG5} '8
ps.getStartIndex()当前分页索引 agD.J)v\
ps.getNextIndex()下一页索引 #vwXx r
ps.getPreviousIndex()上一页索引 Khd ,|pM
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 X#<Sv>c^
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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 <Rt@z|Zv
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一下代码重构了。 $c47cJO)W
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我把原本我的做法也提供出来供大家讨论吧: _,~zy9{,
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首先,为了实现分页查询,我封装了一个Page类: tn1aH
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java代码: 0n=E.qZ9c
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/*Created on 2005-4-14*/ iKY&gnu"
package org.flyware.util.page; wv-8\)oA
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/** ^+<uHd>
* @author Joa (J*0/7
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* RoZV6U~
*/ M czWg
publicclass Page { ]"6<"1)
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/** imply if the page has previous page */ rg~CF<
privateboolean hasPrePage; y"ck;OQD
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/** imply if the page has next page */ 1-#tx*>AY
privateboolean hasNextPage; < r~Tj
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/** the number of every page */ IpxjP\
privateint everyPage; VUb*,/hxa
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/** the total page number */ }0G Ab2
privateint totalPage; k|5nu-B0v
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/** the number of current page */ |sh U
privateint currentPage; 2 OTpGl
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/** the begin index of the records by the current y(k2p
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query */ l;uEw
privateint beginIndex; =j0V/=
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/** The default constructor */ ,o)MiR9-[A
public Page(){ 5kF5`5+Vj
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} qU}DOL|
LjH];=R
/** construct the page by everyPage Ogb_WO;)
* @param everyPage AZa3!e/1
* */ DQ)SMqOotw
public Page(int everyPage){ yrjm0BM#
this.everyPage = everyPage; Ij+zR>P8=\
} jhLh~.
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/** The whole constructor */ HIF]c
public Page(boolean hasPrePage, boolean hasNextPage, jnTl%aQYc
jK =[
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int everyPage, int totalPage, p,Z6/e[SI
int currentPage, int beginIndex){ z+b~#f3
this.hasPrePage = hasPrePage; 6]Jv3Re'(I
this.hasNextPage = hasNextPage; ^!9b#Ja
this.everyPage = everyPage; J.<m@\U
this.totalPage = totalPage; '.=Z2O3p
this.currentPage = currentPage; /a
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this.beginIndex = beginIndex; Q-"FmD-Yw
} Lg^m?~{
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/** =4zsAa
* @return ]HRZ9oP
* Returns the beginIndex. d|TIrlA
*/ 1Jahu!c?
publicint getBeginIndex(){ E8xXr>j>#
return beginIndex; !hq7R]TC+
} *f(}@U
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/** O/k4W#
* @param beginIndex !
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* The beginIndex to set. K)qmJ-Gub
*/ t~AesHZpk
publicvoid setBeginIndex(int beginIndex){ TX>;2S3q
this.beginIndex = beginIndex; B0Z@ Cf
} #U1soZ7
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/** HV sIbQS
* @return +LUL-d
* Returns the currentPage. 6?_Uow}
*/ 0`x<sjG\q
publicint getCurrentPage(){ 5`+*({
return currentPage; 9J?j2!D
} )S%mKdOm
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/** {<GsM
* @param currentPage 65AOFH
* The currentPage to set. gs!{'=4wT
*/ #NqA5QR
publicvoid setCurrentPage(int currentPage){ BAxZR
this.currentPage = currentPage; >fjf]
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} f5G17: Q
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/** sK\?i3<?
* @return _])1P?.
* Returns the everyPage. y|@^0]}%<
*/ H(pOR<`
publicint getEveryPage(){ 0trFLX
return everyPage; ';1
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} S&VN</p
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/** J@Li*Ypo
* @param everyPage vH?/YhH|
* The everyPage to set. ss[8d%V
*/ %PG0PH4?
publicvoid setEveryPage(int everyPage){ 9A6ly9DIS
this.everyPage = everyPage; 6G(k{S
} "u%$`*
7
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/** tuv4~i<
* @return H[Qh* pq2
* Returns the hasNextPage. 3Mdg&~85
*/ Y)uNzb6R
publicboolean getHasNextPage(){ #>233<
return hasNextPage; N+r~\[N\9
} 9oaq%Sf
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/** 'n=FBu^
* @param hasNextPage bDr'W
* The hasNextPage to set. `xtN+y F
*/ c`iSe$eS
publicvoid setHasNextPage(boolean hasNextPage){ J)R2O4OEd
this.hasNextPage = hasNextPage; LJBoS]~
} 0S' EnmG
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/** {!-w|&bF
* @return 6Fm.^9@
* Returns the hasPrePage. Jus)cO#I
*/ _ p?q/-[4
publicboolean getHasPrePage(){ {}>"f]3
return hasPrePage; sx/g5?zh
} 72PDqK#
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/** e\P+R>i0
* @param hasPrePage
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* The hasPrePage to set. <
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*/ 9J>DLvl;
publicvoid setHasPrePage(boolean hasPrePage){ +oyc9PoXF
this.hasPrePage = hasPrePage; ;B7>/q;g
} Y(&phv&
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/** ?"L>jr(
* @return Returns the totalPage. >s1HQSe66
* au GN~"n^
*/ (OJ}|*\ e
publicint getTotalPage(){ @]OI(B
return totalPage; "Uyw7
} p<jHUG4?'
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/** QJ$]~)w?H
* @param totalPage MY0Wr%@#0
* The totalPage to set. jL2f74?1
*/ A?_2@6Y^
publicvoid setTotalPage(int totalPage){ ~>C!l k
this.totalPage = totalPage; wv1?v_4
} /1O6;'8He
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} ,x_g|J _Y
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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 d{YhKf#~
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个PageUtil,负责对Page对象进行构造: fA|'}(kH
java代码: N`#v"f<~Q
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/*Created on 2005-4-14*/ @w2}WX>
package org.flyware.util.page; U;;Har
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import org.apache.commons.logging.Log; 6_9w1
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import org.apache.commons.logging.LogFactory; \ 0:ITz
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/** E6n;_{Se/S
* @author Joa <@Ew-JU
* ?lbX.+
*/ Gk!v-h9cq
publicclass PageUtil { ;7qk9rz4
k5<lkC2z
privatestaticfinal Log logger = LogFactory.getLog 8o~\L=
l
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(PageUtil.class); !4
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/** {Q4=GrS
* Use the origin page to create a new page J,IOp-
* @param page u |#ruFR
* @param totalRecords vnIxI a
* @return J :,
*/ DrW]`%Ql
publicstatic Page createPage(Page page, int X5)>yM^N`
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totalRecords){ @ cv`}k
return createPage(page.getEveryPage(), RPLr7Lb
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page.getCurrentPage(), totalRecords); 5ptbz<Xv
} {5*+
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/** -'ZP_$sA
* the basic page utils not including exception az`5{hK
%d*}:295
handler 1a%*X UT
* @param everyPage p-ry{"XA
* @param currentPage &9^c-;Vs
* @param totalRecords 1f~_# EIC
* @return page 6Q\n<&,{
*/ F= #zy#@.
publicstatic Page createPage(int everyPage, int W&r