Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 >I}9LyZt
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 L*h{'<Bz
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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 )=J5\3O*x
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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 <A>)[u
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。 !d,8kG
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分页支持类: n`ViTwd]MQ
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java代码: 1|{bDlmt
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package com.javaeye.common.util; *4S-z&,.c
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import java.util.List; -`+<{NHv\
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publicclass PaginationSupport { :u6JjW[a)
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publicfinalstaticint PAGESIZE = 30; k|vI<:'p,
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privateint pageSize = PAGESIZE; #*9-d/K
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privateList items; :XG;ru%i
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privateint totalCount; 26 I
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privateint[] indexes = newint[0]; /ASaB
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privateint startIndex = 0; 0v)bA}k
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public PaginationSupport(List items, int Es5f*P0
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totalCount){ N~^yL <O
setPageSize(PAGESIZE); {2&m`Dbm
setTotalCount(totalCount); JIm4vS
setItems(items); T!RT<&
setStartIndex(0); 1PH:\0}
} g7\,{Bw#E
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public PaginationSupport(List items, int 5%zXAQD=<
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totalCount, int startIndex){ yWDTjY/
setPageSize(PAGESIZE); jN31hDg<z
setTotalCount(totalCount); Z[Qza13lo
setItems(items);
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setStartIndex(startIndex); Yd
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} 8uNULob
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public PaginationSupport(List items, int *\}}Bv+9
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totalCount, int pageSize, int startIndex){ t_z,>,BqJ
setPageSize(pageSize); }t9.N`xu
setTotalCount(totalCount); XV3C`:b
setItems(items); S! Rc|6y%
setStartIndex(startIndex); {-3L IO
} O7d$YB_'
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publicList getItems(){ lot%N(mB`
return items; kIHDeo%K}
} <%.5hCTp97
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publicvoid setItems(List items){ r;BT,jiX
this.items = items; /X"/ha!=&D
} ]\-^>!F #K
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publicint getPageSize(){ Zxr!:t7
return pageSize; !p TJ./
} Jn:ZYqc
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publicvoid setPageSize(int pageSize){ M_v?9L
this.pageSize = pageSize; j9Ybx#
} ^G&3sF}
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publicint getTotalCount(){ hu_ ^OlF
return totalCount; >r`b_K
} dzLQI}89+k
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publicvoid setTotalCount(int totalCount){ 1"Z@Q`}
if(totalCount > 0){ j/=iMq
this.totalCount = totalCount; CTX9zrY*T
int count = totalCount / |-sPLU&s%
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pageSize; 4[Z\
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if(totalCount % pageSize > 0) k@zy
count++; v+p{|X-
indexes = newint[count]; 0a8/B>
for(int i = 0; i < count; i++){ {3;AwhN0H
indexes = pageSize * ;g{qYj_
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} XL#[%X9
}else{ {{V8;y
this.totalCount = 0; !cKz7?w
} =qN2Xg/
} rpeJkG@+
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publicint[] getIndexes(){ u\&b4=nL
return indexes; 8!.ojdyn
} +]=e;LN $0
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publicvoid setIndexes(int[] indexes){ R1Sy9x .
this.indexes = indexes; HhO".GA
} J>fQNW!{
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publicint getStartIndex(){ g^*<f8 ~d
return startIndex; ; ^t{Il'j
} @`\VBW
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publicvoid setStartIndex(int startIndex){ t78k4?
if(totalCount <= 0) I*9e]m"
this.startIndex = 0; x.Q&$#
elseif(startIndex >= totalCount) vJAZ%aW
this.startIndex = indexes <ZU=6Hq
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[indexes.length - 1]; O=u1u}CP?
elseif(startIndex < 0) o7IxJCL=Q
this.startIndex = 0; hig2
else{ [+O"<Ua
this.startIndex = indexes .<kqJ|SVi
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[startIndex / pageSize]; THmb6^
} y%
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} gZ5[
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publicint getNextIndex(){ ~]ZpA-*@Ut
int nextIndex = getStartIndex() + N !TW!
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pageSize; R|i/lEq
if(nextIndex >= totalCount) Da"j E
return getStartIndex(); <n3!{w3<
else C6rg<tCH
return nextIndex; NcY608C
} B"%{i-v>**
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publicint getPreviousIndex(){ 6 uKTGc4
int previousIndex = getStartIndex() - &89oO@5
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pageSize; 2NB L}x
if(previousIndex < 0) i<pk6rO1
return0; mKYeD%Pm*
else eh"3NRrN
return previousIndex; |_uaS
} \U@rg4
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} m&|`x
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抽象业务类 &+G"k~%
java代码: {rcnM7 S1L
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/** =J1rlnaaEL
* Created on 2005-7-12 #-h\. #s
*/ CKA;.sh
package com.javaeye.common.business; >[X{LI(_<<
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import java.io.Serializable; 52o x`t|
import java.util.List; 2)j0Ai%
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import org.hibernate.Criteria; ak:c rrkx
import org.hibernate.HibernateException; Q
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import org.hibernate.Session; ,m,)I
import org.hibernate.criterion.DetachedCriteria; q 4V7
import org.hibernate.criterion.Projections; s: 3z'4oX
import 6m6zA/
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org.springframework.orm.hibernate3.HibernateCallback; .L~Nq%g1
import j2 !3rI
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org.springframework.orm.hibernate3.support.HibernateDaoS Z}-Vf$O~
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upport; -j&Tc`j_
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import com.javaeye.common.util.PaginationSupport; w9|w2UK
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public abstract class AbstractManager extends 29reG,>
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HibernateDaoSupport { KM`eIw>8
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privateboolean cacheQueries = false; Oh4AsOj@
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privateString queryCacheRegion; bO<CR
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publicvoid setCacheQueries(boolean 'g9"Qv?0{`
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cacheQueries){ zq%D/H6J,
this.cacheQueries = cacheQueries; R6=$u{D
} ,\v91 Rp~?
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publicvoid setQueryCacheRegion(String \lSU
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queryCacheRegion){ nVJPR
this.queryCacheRegion = Pzb|t+"$
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queryCacheRegion; WKSPBT;
} u<nLag
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publicvoid save(finalObject entity){ ,k G>?4
getHibernateTemplate().save(entity); mg,j:,
} 8#Q$zLK42N
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publicvoid persist(finalObject entity){ D0BI5q
getHibernateTemplate().save(entity); 5y?-fT]X
} &hk-1y9QS
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publicvoid update(finalObject entity){ n3sUbs;
getHibernateTemplate().update(entity); ek
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} |`jjHuQ;
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publicvoid delete(finalObject entity){ D_8x6`z
getHibernateTemplate().delete(entity); ;}'D16`j
} ;.bm6(;
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publicObject load(finalClass entity, YX*Qd$chZ
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finalSerializable id){ ]@Sj`J[fd
return getHibernateTemplate().load y7^{yS[,
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(entity, id); `ImE% r!
} 'fL"txW
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publicObject get(finalClass entity, XbQlHfrS
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finalSerializable id){ {f{ZHi|
return getHibernateTemplate().get x=#VX\5k:
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(entity, id); l
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} Xj*vh
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publicList findAll(finalClass entity){ P/`I.p ;
return getHibernateTemplate().find("from 4GB7A]^E
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" + entity.getName()); Xo*DvD
} TYA~#3G)
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publicList findByNamedQuery(finalString ~l2aNVv;
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namedQuery){ zuJtpMn
return getHibernateTemplate w4LScvBg
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().findByNamedQuery(namedQuery); AL5Vu$V~n}
} LjU'z#
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publicList findByNamedQuery(finalString query, 0dh=fcb
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finalObject parameter){ ?i`l[+G
return getHibernateTemplate L_w+y
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().findByNamedQuery(query, parameter); %e@HZ"V
} |!F5.%PY
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publicList findByNamedQuery(finalString query, &)oOeRwi].
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finalObject[] parameters){ (
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return getHibernateTemplate &5L<i3BX
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().findByNamedQuery(query, parameters); ^V%rag
} Wpc|`e<
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publicList find(finalString query){ 2On_'^O
return getHibernateTemplate().find fQP {|+4
q{ /3V
(query); Pm$q]A~
} I7&_Xr
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publicList find(finalString query, finalObject [{r}u
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parameter){ i>[_r,-\[
return getHibernateTemplate().find u=YX9Mo!
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(query, parameter); [ 4;Ii
} HV/c c"
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public PaginationSupport findPageByCriteria = P
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(final DetachedCriteria detachedCriteria){ srV.)Ur
return findPageByCriteria {-A^g!jT&
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 1jX3ey~
} )z8!f}:De=
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public PaginationSupport findPageByCriteria KLX/O1B
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(final DetachedCriteria detachedCriteria, finalint $#|gLVOQ
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startIndex){ GQ_p-/p
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return findPageByCriteria \cLSf=
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(detachedCriteria, PaginationSupport.PAGESIZE, GHQ;hN:
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startIndex); QORN9SY
} r_YIpnJ
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public PaginationSupport findPageByCriteria 8?Z4-6!{V,
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(final DetachedCriteria detachedCriteria, finalint y ?G_y
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pageSize, 6{qIU}!
finalint startIndex){ 0qrqg]
return(PaginationSupport) Y4IGDY*
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getHibernateTemplate().execute(new HibernateCallback(){ Ez{MU@Fk
publicObject doInHibernate <[GYLN[0Q
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(Session session)throws HibernateException { C%~a`e|/Y
Criteria criteria = wZh:F
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detachedCriteria.getExecutableCriteria(session); DKVT(#@T
int totalCount = Ys8SDlMo
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((Integer) criteria.setProjection(Projections.rowCount V]S1X^
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()).uniqueResult()).intValue(); .q][? mW3
criteria.setProjection Eq:2k)BE
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(null); 7a=S
List items = 4Z*U}w)
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criteria.setFirstResult(startIndex).setMaxResults ,^8 MB.
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(pageSize).list(); _W3Y\cs,-
PaginationSupport ps = $W;b{H=F
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new PaginationSupport(items, totalCount, pageSize, ]B=C|usJ
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startIndex); PIXL6
return ps; B cj/y4"
} -|Kzo_"
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}, true); -A-tuyIsh"
} 79=45' 8
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public List findAllByCriteria(final dC}`IR
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DetachedCriteria detachedCriteria){ +%\oO/4Fs
return(List) getHibernateTemplate 8j1ekv
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().execute(new HibernateCallback(){ vVT?h
publicObject doInHibernate -6sW6;Q
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(Session session)throws HibernateException { @DC)]C2
Criteria criteria = wve=.n
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detachedCriteria.getExecutableCriteria(session); ^zEE6i
return criteria.list(); 7~M<cD
} eo^/c+FG
}, true); 6D;^uM2N
} oPKXZU(c
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public int getCountByCriteria(final 0@Kkl$O>mb
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DetachedCriteria detachedCriteria){ %i)B*9k
Integer count = (Integer) vw<K}z
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getHibernateTemplate().execute(new HibernateCallback(){ t5
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publicObject doInHibernate #pdUJ2)yM
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(Session session)throws HibernateException { f c6g
Criteria criteria = mCKk*5ws5"
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detachedCriteria.getExecutableCriteria(session); G[idN3+#
return -Cid3~mX3
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criteria.setProjection(Projections.rowCount o/^;@5\
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()).uniqueResult(); 5,b]V)4
} u~Tg&0V30
}, true); rn.\tDeA
return count.intValue(); #k5#j4!b
} YnV/M,U
} DlE_W+F
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用户在web层构造查询条件detachedCriteria,和可选的 Tvf~P w
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 {,O`rW_eS
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PaginationSupport的实例ps。 i~qfGl p6)
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ps.getItems()得到已分页好的结果集 2Eh@e([PMs
ps.getIndexes()得到分页索引的数组 SlT*C6f
ps.getTotalCount()得到总结果数 zREJ#r
ps.getStartIndex()当前分页索引 Y9}8M27vQG
ps.getNextIndex()下一页索引 h5@j`{
ps.getPreviousIndex()上一页索引 Ri?\m!o
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 q"aPJ0ni'
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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 P0\eBS
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一下代码重构了。 RSWcaATZN
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我把原本我的做法也提供出来供大家讨论吧: !jh%}JJ
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首先,为了实现分页查询,我封装了一个Page类: "zV']A>4H
java代码: ?9U:g(v
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/*Created on 2005-4-14*/ 1
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package org.flyware.util.page; |PM m?2^ R
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/** C%H9[%k
* @author Joa oK-!(1A-
* K=kH%ZK
*/ , Fytk34
publicclass Page {
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/** imply if the page has previous page */ r*cjOrvI
privateboolean hasPrePage; \K`jCsT
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/** imply if the page has next page */ P79R~m`
privateboolean hasNextPage; t9*=
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/** the number of every page */ =l|>.\-
privateint everyPage; <NQyP{p
{$TZ}z"DA
/** the total page number */ E#h~V5Tf
privateint totalPage; .Dv=pB,u
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/** the number of current page */ ?6:cNdN
privateint currentPage; Fd!iQ
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/** the begin index of the records by the current @P70W<<
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query */ <3#<I)#
privateint beginIndex; ;nf&c;D
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/** The default constructor */ :_c*m@=z(
public Page(){ 0!IPcZjY7
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} LkaG[^tfN
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/** construct the page by everyPage "#XtDpGk
* @param everyPage y"R("j $
* */ ?cBO6^
public Page(int everyPage){ Q eK{MF
this.everyPage = everyPage; T 'i~_R6
} 2
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/** The whole constructor */ oWrE2U;
public Page(boolean hasPrePage, boolean hasNextPage, 83?1<v0%
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int everyPage, int totalPage, Hd*Fc=>"Y
int currentPage, int beginIndex){ 5byeWH0n3
this.hasPrePage = hasPrePage; }@*I+\W/
this.hasNextPage = hasNextPage; foyB{6q8
this.everyPage = everyPage; $F1_^A[
this.totalPage = totalPage; 3B"7VBK{
this.currentPage = currentPage; As}eUm)B5c
this.beginIndex = beginIndex; !Ud:?U
} :tlE`BIp
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/** B$DZ]/<
* @return h+xA?[c=
* Returns the beginIndex. [edH%S}\
*/ THr8o V5
publicint getBeginIndex(){ :R3P 58>
return beginIndex; wzxdVn
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} _]EyEa
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/** rkq)&l=ny
* @param beginIndex vh{9'vd3el
* The beginIndex to set. Y^X:vI
*/ +0U#.|?
publicvoid setBeginIndex(int beginIndex){ ${@q?iol
this.beginIndex = beginIndex; A ~XOK;sB
} t,1in4sN
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/** hXPocP
* @return 6#O#T;f)
* Returns the currentPage. hRRkFz/0&
*/ ]2LXUYB
publicint getCurrentPage(){ ;Na^]32
return currentPage; /=q.tDH=I
} RP(a,D|
U @)k3^
/** jp%+n
* @param currentPage }2h't.Z<u
* The currentPage to set. .<HC[ls
*/ T!1SMo^
publicvoid setCurrentPage(int currentPage){ )tScc*=8
this.currentPage = currentPage; & &