Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 zEy,aa:M
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 2Fc>6]:*
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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 f >$V:e([
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 jBMGm"NE
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分页支持类: *Y`c.n"
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java代码: B>UF dj]-
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package com.javaeye.common.util; @/W~lJ!e
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import java.util.List; /C
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publicclass PaginationSupport { !]C=5~BBI
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publicfinalstaticint PAGESIZE = 30; UUR+PfY
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privateint pageSize = PAGESIZE; 9p4=iXfR
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privateList items; *O'`&J
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privateint totalCount; Pr'Ij
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privateint[] indexes = newint[0]; 2(i|n=
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privateint startIndex = 0; sd&^lpH
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public PaginationSupport(List items, int ac!!1lwA
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totalCount){ Gy F
setPageSize(PAGESIZE); m[DCA\Mo@
setTotalCount(totalCount); 9>k_z&<
setItems(items); 4l'`q+^-
setStartIndex(0); *2>kic
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} W9!K~g_
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public PaginationSupport(List items, int :5[1Iepdn
@! {Y9k2
totalCount, int startIndex){ e+<'=_x {
setPageSize(PAGESIZE); .]YTS
setTotalCount(totalCount); 7q(A&
setItems(items); a.2Xl}2o5
setStartIndex(startIndex); =/Ph]f9
} IXv9mr?H}
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public PaginationSupport(List items, int K~6u5 a9s
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totalCount, int pageSize, int startIndex){ T# .pi@PF>
setPageSize(pageSize); i:60|ngK
setTotalCount(totalCount); .$]-::&
setItems(items); 5m2f\^U
setStartIndex(startIndex); j;BlpRD}
} \l1==,wk
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publicList getItems(){ 0k G\9
return items; xmi@
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} gy Ey=@L
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publicvoid setItems(List items){ hsHbT^Qm
this.items = items; 8Dkq+H93
} ,lcSJ^yr
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publicint getPageSize(){ NXX/JJ+w
return pageSize; z/,&w_8,:
} L+8{%\UPd
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publicvoid setPageSize(int pageSize){ CE @[Z
this.pageSize = pageSize; }<^QW't_Y
} "0 $UnR
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publicint getTotalCount(){ nJ}@9v F/
return totalCount; H[RX~Xk2E
} 8n35lI(
[
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publicvoid setTotalCount(int totalCount){ e}+Zj'5
if(totalCount > 0){ K3k{q90
this.totalCount = totalCount; h [@}}6
int count = totalCount / m/3,;P.6
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pageSize; `|2g&Vn
if(totalCount % pageSize > 0) 14DhJUV"b
count++; c~+KrWbZ~
indexes = newint[count]; HR;I}J 9
for(int i = 0; i < count; i++){ _2TL>1KZt
indexes = pageSize * 24u_}ZQzY
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i; ;I?x;lH
} l b;P&V
}else{ H?rC IS0
this.totalCount = 0; yy Y\g
} O(6j:XD
} hHZ'*,9 y
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publicint[] getIndexes(){ 8S7#tb@3
return indexes; K#Zv>x!to
} iK=QP+^VN
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publicvoid setIndexes(int[] indexes){ [
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this.indexes = indexes; pI_dV44W
} L{rd',
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publicint getStartIndex(){ GVhy
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return startIndex; k{H7+;_
} Cu!]-c{
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publicvoid setStartIndex(int startIndex){ FGzKx9I9
if(totalCount <= 0) mV^~
this.startIndex = 0; g^^pPVK_
elseif(startIndex >= totalCount) A"z9t#dv@
this.startIndex = indexes 9s1^hW2%Q
!ewT#afyu(
[indexes.length - 1]; t3h ){jZ
elseif(startIndex < 0) Sy']fGvx
this.startIndex = 0; %DA&txX}w
else{ ia(`3r
this.startIndex = indexes :a^/&LbLm
q}!h(-y}5n
[startIndex / pageSize]; 80ox$U
} ,Ha <lU2K
} SF`(`h0e
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publicint getNextIndex(){ MT7B'hd
int nextIndex = getStartIndex() + ~oJ"si
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pageSize; #IJeq0TVB
if(nextIndex >= totalCount) S@g(kIo]
return getStartIndex();
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else xP,b/T#a
return nextIndex; px*1 3"
} uaz!ze+
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publicint getPreviousIndex(){ ',c~8U#q
int previousIndex = getStartIndex() - gJCZ9{Nl
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pageSize; NJ]3qH
if(previousIndex < 0) a9UXg<4
return0; kIX1u<M~
else s<rV1D
return previousIndex; Svb>s|D
} tJ
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} tbWfm5$
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抽象业务类 hf^<lJh~=
java代码: :m(DRD
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/** {}$Zff
* Created on 2005-7-12 0|J_'-<
*/ 7}g4ePYag
package com.javaeye.common.business; dI&Q5M8
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import java.io.Serializable; (0B?OkQ
import java.util.List; DzQ
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import org.hibernate.Criteria; #fYB4.i~
import org.hibernate.HibernateException; tc<uS%XT4^
import org.hibernate.Session; 6pSi-FH
import org.hibernate.criterion.DetachedCriteria; N0.|Mb"?t
import org.hibernate.criterion.Projections; 4l+!Z, b
import R(`:~@3\6
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org.springframework.orm.hibernate3.HibernateCallback; tAF?.\x"g
import #{PwEX
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org.springframework.orm.hibernate3.support.HibernateDaoS !
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upport; :nQlS
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import com.javaeye.common.util.PaginationSupport; 7jgj;%
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public abstract class AbstractManager extends Rd&DH_<+^
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HibernateDaoSupport { @p
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privateboolean cacheQueries = false; m3gv %h
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privateString queryCacheRegion; #<S*MGp!=
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publicvoid setCacheQueries(boolean 2lCFE)
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cacheQueries){ QYboX~g~p
this.cacheQueries = cacheQueries; =29IHL3
} j/z=<jA
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publicvoid setQueryCacheRegion(String ca{MJz'
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queryCacheRegion){ ;~EQS.Qp
this.queryCacheRegion = *y!O\-\S#>
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queryCacheRegion; kIVQ2hmv
} 6e%@uB}$
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publicvoid save(finalObject entity){ V}Y*Yv
getHibernateTemplate().save(entity); E4L?4>V@\
} ]7O<|8n!d
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publicvoid persist(finalObject entity){ r<ucHRO#
getHibernateTemplate().save(entity); 4"|Xndh1.
} N-\N\uN
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publicvoid update(finalObject entity){ kFv*>>X`
getHibernateTemplate().update(entity); t$18h2yOL
} d )O^(y1r
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publicvoid delete(finalObject entity){ =~GP;=6
getHibernateTemplate().delete(entity); 6
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} [OW <<6
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publicObject load(finalClass entity, YV<y-,Io
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finalSerializable id){ #wI}93E
return getHibernateTemplate().load d+
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(entity, id); a%T`c/C
} #;]#NqFX
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publicObject get(finalClass entity, RpQeQM=
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finalSerializable id){ QQM:[1;RT
return getHibernateTemplate().get kAQ(8xV
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(entity, id); 1f`De`zXzr
} v;x0=I&%
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publicList findAll(finalClass entity){ jYHn J}<
return getHibernateTemplate().find("from *nCA6i
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" + entity.getName()); i6WH^IQ M
} nm-
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publicList findByNamedQuery(finalString 2DQVl
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namedQuery){ zm"
return getHibernateTemplate RbAl_xKI
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().findByNamedQuery(namedQuery); %MeAa?G-#
} jE\G_>
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publicList findByNamedQuery(finalString query, BNfj0e 5b
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finalObject parameter){ <]qNjsdb9"
return getHibernateTemplate 3iCe5VF
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().findByNamedQuery(query, parameter); rwRZGd *p
} U.e!:f4{
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publicList findByNamedQuery(finalString query, *;fTiL
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finalObject[] parameters){ g8<ODU0[g
return getHibernateTemplate o,*m,Qc
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().findByNamedQuery(query, parameters); A2|Bbqd
} g:o/^_
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publicList find(finalString query){ >jW**F
return getHibernateTemplate().find rNP;53FtZl
B\J[O5},
(query); A{+/$7vek
} f%]@e9dD
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publicList find(finalString query, finalObject 7=P)` @
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parameter){ Kxsd@^E
return getHibernateTemplate().find ?"yjgt7+y
!> sA.L&=
(query, parameter); Y&6jFT_
} !db=Iz5)
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public PaginationSupport findPageByCriteria xV>
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(final DetachedCriteria detachedCriteria){ opfnIkCe
return findPageByCriteria S5).\1m h[
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); !VD$uT
} (HAdr5
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public PaginationSupport findPageByCriteria {!I`EN]
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(final DetachedCriteria detachedCriteria, finalint 7ys' [G|}r
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startIndex){ VzT*^PFBg
return findPageByCriteria fzJiW@-T
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(detachedCriteria, PaginationSupport.PAGESIZE, ]3v)3Wp
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startIndex); +3))G
} ]xS%Er
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public PaginationSupport findPageByCriteria D1RQkAZS
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(final DetachedCriteria detachedCriteria, finalint dpW`e>o
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pageSize, ]-wyZ +a
finalint startIndex){ )u(,.O[cw
return(PaginationSupport) r*{.|>me
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getHibernateTemplate().execute(new HibernateCallback(){ ~BI`{/O=
publicObject doInHibernate 8(? &=>@
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(Session session)throws HibernateException { M(>74(}]
Criteria criteria = zw3I(_d[
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detachedCriteria.getExecutableCriteria(session); 2m $C;j!D
int totalCount = OdNo2SO
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((Integer) criteria.setProjection(Projections.rowCount *L<EGFP
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()).uniqueResult()).intValue(); myo4`oH
criteria.setProjection |21VOPBS
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(null); Q%6zr9
List items = D&fOZVuqZ
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criteria.setFirstResult(startIndex).setMaxResults /%g@ ;
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(pageSize).list(); "C}<umJ'
PaginationSupport ps = 92j[b_P
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new PaginationSupport(items, totalCount, pageSize, O}C*weU
6EY\
startIndex); 7b~uU@L`
return ps; m2m
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} ,tXI*R
}, true); -medD G
} $\m:}\%p
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public List findAllByCriteria(final X!V#:2JY
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DetachedCriteria detachedCriteria){ )-I/ej^
return(List) getHibernateTemplate ]R~hzo
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().execute(new HibernateCallback(){ gR/?MJ(v
publicObject doInHibernate 2 6}3
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(Session session)throws HibernateException { ~;b}_?%o
Criteria criteria = 9<&*iIrM
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detachedCriteria.getExecutableCriteria(session); fbM>jK
return criteria.list(); ShQ! '[J
} +6:
}, true); oHfr
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} _rSwQ<38>
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public int getCountByCriteria(final 5ms]Wbh)
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DetachedCriteria detachedCriteria){ E
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Integer count = (Integer) md bi@ms@
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getHibernateTemplate().execute(new HibernateCallback(){ gDJ} <^
publicObject doInHibernate InL_JobE8r
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(Session session)throws HibernateException { id,' + <
Criteria criteria = C`ZU.|R
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detachedCriteria.getExecutableCriteria(session); aQHR=.S]X
return ;eo}/-a_Xw
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criteria.setProjection(Projections.rowCount ;[4=?GL*
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()).uniqueResult(); O,7S1
} \>9^(N
}, true); 'PrBa[%
return count.intValue(); s3sD7 @
} -F(luRBS(W
} J3'q.Pc
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用户在web层构造查询条件detachedCriteria,和可选的 %*K zP{
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 o;
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PaginationSupport的实例ps。 )Ft+eMYti[
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ps.getItems()得到已分页好的结果集 cBbumf 9C
ps.getIndexes()得到分页索引的数组 r#oJch=
ps.getTotalCount()得到总结果数 iDcYyNE
ps.getStartIndex()当前分页索引 \-Xtbm
ps.getNextIndex()下一页索引 2&pE
ps.getPreviousIndex()上一页索引 }l} _'FmQ
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 sZ7,7E|_
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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 Z0v?3v}9^
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一下代码重构了。 SXe1Q8;
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我把原本我的做法也提供出来供大家讨论吧: <_kA+&T
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首先,为了实现分页查询,我封装了一个Page类: @+~>utr
java代码: y$di_)&g
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/*Created on 2005-4-14*/ B#`'h~(7
package org.flyware.util.page; SmvMjZ+7Y
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/** W2v'2qAs
* @author Joa Gj%q:[r
* f.%3G+
*/ h{zb)'R
publicclass Page { =_j<x$,b-
@vib54G
/** imply if the page has previous page */ ?7lW@U0
privateboolean hasPrePage; oa=TlBk<
*_J{_7pwe
/** imply if the page has next page */ FG!hb?_1
privateboolean hasNextPage; 3b#L*-
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/** the number of every page */ %CnNu
privateint everyPage; &w`DF,k|
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/** the total page number */
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privateint totalPage; bZAL~z+ V
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/** the number of current page */ G; W2Z,
privateint currentPage; TF!v ,cX
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/** the begin index of the records by the current -F*vN'
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query */ zkqn>
privateint beginIndex; y3j"vKG
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/** The default constructor */ |&
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public Page(){ z$d<ep{6
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} '/X]96Ci7
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/** construct the page by everyPage _emW#*V
* @param everyPage h<>yzr3fN
* */ '+vmC*-I(
public Page(int everyPage){ @OFxnF`
this.everyPage = everyPage; X6(s][Wn
} \G)F*
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/** The whole constructor */ S3WUccv
public Page(boolean hasPrePage, boolean hasNextPage, 2P^qZDG 8I
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int everyPage, int totalPage, KUm?gFh
int currentPage, int beginIndex){ >mR8@kob<
this.hasPrePage = hasPrePage; v4'kV:;&
this.hasNextPage = hasNextPage; uPYH3<
this.everyPage = everyPage; D `V.gV]
this.totalPage = totalPage; u,d5/`E
this.currentPage = currentPage; )u=W?5%=}
this.beginIndex = beginIndex; u-:3C<&>
} T,>L
f.66N9BHL,
/** :-Py0{s
* @return <Q- m &
* Returns the beginIndex. H|wP8uQC
*/ ]{\M,txo8
publicint getBeginIndex(){ 1(:!6PY
return beginIndex; v*dw'i
} wD{c$TJ?{F
LGW_7&0<<
/** <m1v+cnqo
* @param beginIndex -MTYtw(
* The beginIndex to set. ^eO/?D8~h
*/ )
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publicvoid setBeginIndex(int beginIndex){ q-_!&kDK"
this.beginIndex = beginIndex; ^->S7[N?
} "&4r!2A
#)]t4wa_W
/** x{<l8vL=-c
* @return Qe ip h
* Returns the currentPage. {]dtA&8(
*/ 7 [u>#8
publicint getCurrentPage(){ 2u!&Te(!9
return currentPage; $of2 lA
} XM`
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/** YC56]Zp
* @param currentPage 66" 6>
* The currentPage to set. 8,!Oup
*/ qz (x
publicvoid setCurrentPage(int currentPage){ :|n iFK4
this.currentPage = currentPage; | Rhqi
} Q%d1n*;+
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/** Q3&q%n|<
* @return !8cV."~
* Returns the everyPage. kC
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*/ ykPiZK
publicint getEveryPage(){ uh2_Rzln
return everyPage; 73Jm
} fCJjFL:
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/** P+|L6w*|[
* @param everyPage v*=P
* The everyPage to set. h3 XSt
*/ 0*rD'?)K+
publicvoid setEveryPage(int everyPage){ }b&S3?ONt
this.everyPage = everyPage; .#|?-5q/iN
} Q!U}
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/** }(ORh2Ri
* @return "z3rH~q72
* Returns the hasNextPage. NId.TaXh
*/ &s(&B>M
publicboolean getHasNextPage(){ uXh:/KO
return hasNextPage; 3Ioe#*5\
} =uAy/S
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/** GjHR.p?-
* @param hasNextPage q=BljSX
* The hasNextPage to set. !@8i(!xb
*/ (A6~mi r!
publicvoid setHasNextPage(boolean hasNextPage){ T:Klr=&V
this.hasNextPage = hasNextPage; IY#:v%U
} 9N}\>L)_
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/** {o)pwM"@(
* @return ^9q#,6
* Returns the hasPrePage. g;8 wP5i
*/ %'H DP3
publicboolean getHasPrePage(){ I_u/
return hasPrePage; =huV(THU
} .)!QsBU
*$NZi*z3
/** xV5UaD<
* @param hasPrePage y3s+.5;
* The hasPrePage to set. U"p</Q
*/ `**{a/3
publicvoid setHasPrePage(boolean hasPrePage){ <c pck
this.hasPrePage = hasPrePage; #H>{>0q
} PKSfu++Z
c8JW]A`9b)
/** 4Qfsxg
* @return Returns the totalPage. Q,xL8i
M,
* l_+@Xpl
*/ x2#JD|0
publicint getTotalPage(){ p#ar`-vQ
return totalPage; "}fweCBgo
} jBw)8~tYm
K -rR)-rI
/** FHSoj=
* @param totalPage :Tg+)c Z
* The totalPage to set. 67&
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*/ &S*~EM.l8
publicvoid setTotalPage(int totalPage){ K?!qNK
this.totalPage = totalPage; EaO@I.[
} DdgiY9a.
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} :V)jm`)#+
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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 'Be'!9K*d
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个PageUtil,负责对Page对象进行构造: Pj-INc96
java代码: \@:,A]
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/*Created on 2005-4-14*/ <'I["Um
package org.flyware.util.page; :;7I_tb
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import org.apache.commons.logging.Log; !SQcV'
import org.apache.commons.logging.LogFactory;
|/*Pimk
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/** Z nc(Q
* @author Joa -[V-f> :
* ^[tE^(|T
*/ ~y!'\d>q<
publicclass PageUtil { hJ'H@L7
6@J=n@J$p
privatestaticfinal Log logger = LogFactory.getLog ZYwcB]xEz
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(PageUtil.class); my.EvN
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/** }Q/onBt
* Use the origin page to create a new page d!y*z
* @param page I#M3cI!X?
* @param totalRecords g\JJkXjD#
* @return PLyity-L[7
*/ Ic#xz;elM
publicstatic Page createPage(Page page, int @^W`Yg)C
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totalRecords){ k&]nF,f
return createPage(page.getEveryPage(), e<L@QNX
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page.getCurrentPage(), totalRecords); %fqR
} wSTulo: 9
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/** |7s2xRc
* the basic page utils not including exception Dm>"c;2
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handler NI >%v
* @param everyPage |^pev2g
* @param currentPage y/lF1{}5
* @param totalRecords @X2*O9
* @return page |p11Jt[
*/ -Aj)<KNx[
publicstatic Page createPage(int everyPage, int l90mM'[
:]^e-p!z
currentPage, int totalRecords){ ~&?bU]F
everyPage = getEveryPage(everyPage); x *Lt]]A
currentPage = getCurrentPage(currentPage); Bh>L"'.2
int beginIndex = getBeginIndex(everyPage, }htjT/Nm
jVj5 ; }
currentPage); XIeLu"TSL
int totalPage = getTotalPage(everyPage, !>8~R2
1o_kY"D<
totalRecords); Hcq.Lq;2:
boolean hasNextPage = hasNextPage(currentPage, 1 DWoL}Z
157_0
totalPage); +L(amq;S
boolean hasPrePage = hasPrePage(currentPage); &NE e-cb[
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returnnew Page(hasPrePage, hasNextPage, rH+OXGoB
everyPage, totalPage, rz?Cn
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currentPage, *Gbhk8}V'
vJkc/7
beginIndex); C_.9qo]DT7
} \oQ]=dDCd%
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privatestaticint getEveryPage(int everyPage){ l\HdB"nT
return everyPage == 0 ? 10 : everyPage; aER|5!7(2\
} 9(CvGzco<
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privatestaticint getCurrentPage(int currentPage){ <AHpk5Sn{
return currentPage == 0 ? 1 : currentPage; uy'ghF
} W?
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privatestaticint getBeginIndex(int everyPage, int Wgq|Q*
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currentPage){
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return(currentPage - 1) * everyPage; iHK~?qd}
} ^[L(kHOGzk
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privatestaticint getTotalPage(int everyPage, int ^rkKE
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totalRecords){ ;t`
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int totalPage = 0; \INH[X#>
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if(totalRecords % everyPage == 0) yqK4 "F&
totalPage = totalRecords / everyPage; N0U/u'J!g
else #Ondhy%h[
totalPage = totalRecords / everyPage + 1 ; )Nv1_en<!
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return totalPage;
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} kmuksT\)a
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privatestaticboolean hasPrePage(int currentPage){ B[vj X"yg
return currentPage == 1 ? false : true;
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} )M*w\'M
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privatestaticboolean hasNextPage(int currentPage, 2EY"[xK|
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int totalPage){ .=_p6_G
return currentPage == totalPage || totalPage == A]1Nm3@
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0 ? false : true; J3Mb]X)_}
} e5=d
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} MfTLa)Rz
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 QaX.Av
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 5:Qz
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做法如下: JuRoeq.
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 'Pz%c}hJ
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的信息,和一个结果集List: GnV0~?
java代码: Zw]`z*,yRA
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/*Created on 2005-6-13*/ F c[KIG3@
package com.adt.bo; $o"nTl
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import java.util.List; f49kf**
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import org.flyware.util.page.Page; |J`EM7qMK
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/** :-&|QVH
* @author Joa -"(*'hD
*/ r^9l/H~$
publicclass Result { 4.6$m
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private Page page;
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private List content; R^Rc!G}
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/** r4.6W[|d
* The default constructor T&U}}iWN
*/ eK8H5YE
public Result(){ e~h>b.~
super(); owVvbC2<b(
} Y~ ~Dg?e
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/** ,OZ
* The constructor using fields iT@`dEZ.
* >WLPE6E
* @param page r)(5,*v
* @param content P-m_],
*/ :}Jx
public Result(Page page, List content){ VJ*1g+c
this.page = page; |5@Ra@0
this.content = content; \BOoY# !a
} ,|%KlHo^
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/** LS@TTiN
* @return Returns the content. s"(RdJ-,
*/ *k$[/{S1-
publicList getContent(){ ~cz}C("Z
return content; !}*N';
} ,(jJOFf
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/** ;qx#]Z0 <
* @return Returns the page. BU
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*/ , 5'o>Y
public Page getPage(){ <,.$U\W
return page; D(cD8fn,J
} J,a&"eOZ
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/** "tCI_
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* @param content 6iFlz9XiI
* The content to set. }"Y<<e<z:
*/ |jsI-?%8J
public void setContent(List content){ ktu?-?#0,
this.content = content; RK# 6JfC3X
} OqGp|`
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/** $C16}^
* @param page OT#@\/>
* The page to set. +)jUA]hJ/
*/ F)P:lvp<r
publicvoid setPage(Page page){ QE]@xLz
this.page = page; o'Bd. B
} 6:1`lsP
} tldT(E6
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2. 编写业务逻辑接口,并实现它(UserManager, cS&KD@.
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UserManagerImpl) UlXm4\@
java代码: 9~p;iiKGG
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AvL /gt:
/*Created on 2005-7-15*/ %$BRQ-O
package com.adt.service; 7uBx
j
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import net.sf.hibernate.HibernateException; {uDW<