Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 twt
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 M
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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 CSc*UX+
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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 /`hr)
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分页支持类: !W^2?pqN
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java代码: cAyR)Y!I
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package com.javaeye.common.util; (J.(Fl>^
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import java.util.List; ~0ZEnejy
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publicclass PaginationSupport { 2-llT
@EfCNOy
publicfinalstaticint PAGESIZE = 30; sl6p/\_w
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privateint pageSize = PAGESIZE; P)1@HDN==
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privateList items; f*XF"@ZQV
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privateint totalCount; P(X#w
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privateint[] indexes = newint[0]; C>v
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privateint startIndex = 0; n,PHfydqX
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public PaginationSupport(List items, int &@dMk4BH<
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totalCount){ Lom%eoH)
setPageSize(PAGESIZE); WcH^bAY 6
setTotalCount(totalCount); h4?+/jk7
setItems(items); NnHwk)'
setStartIndex(0); FT|*~_@
} Xid>8
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public PaginationSupport(List items, int Vaha--QB
^]U2Jd
totalCount, int startIndex){ v[Q)cqj/
setPageSize(PAGESIZE); 30DpIkf
setTotalCount(totalCount); <(f4#BP
setItems(items); _'I9rGlx3
setStartIndex(startIndex); IC}zgvcW
} M<ad>M
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public PaginationSupport(List items, int //J:p,AF
"*7I~.7U(*
totalCount, int pageSize, int startIndex){ @J r
setPageSize(pageSize); AP@xZ%;K
setTotalCount(totalCount); hJ}G5pX
setItems(items); >hQR
setStartIndex(startIndex); a@8knJ|
} +uT=Wb \
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publicList getItems(){ M
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return items; il#rdJ1@t
} 0(i`~g5
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publicvoid setItems(List items){ BKDWd]KEf
this.items = items; #e|eWi>
} {xH
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publicint getPageSize(){ RU{}qPs?
return pageSize; }2\"(_
} 5=?&q 'i
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publicvoid setPageSize(int pageSize){ >N,G@{FR
this.pageSize = pageSize; r!M2H{
} fk"{G>&8
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publicint getTotalCount(){ 'sA&Pm
return totalCount; ~'U;).C
} "~[Rwh?
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publicvoid setTotalCount(int totalCount){ q@\_q!
if(totalCount > 0){ )R|7> 97
this.totalCount = totalCount; 3jI.!xD`
int count = totalCount / RhJ<<T.2
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pageSize; JxvwquI
if(totalCount % pageSize > 0) s{IoL_PJP
count++; QB.7n&u
indexes = newint[count]; -?]ltn9!
for(int i = 0; i < count; i++){ : 1{j&$
indexes = pageSize * ryT8*}o
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i; |4c==7.
} H|!s.
}else{ XMdc n,
this.totalCount = 0; a2 SQ:d
} |H A7 C
} w\mF2h
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publicint[] getIndexes(){ esHiWHAC
return indexes; Z-<u?f8{*
} 6+FON$8
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publicvoid setIndexes(int[] indexes){ <oO,CXF
this.indexes = indexes; S?{5DxilO
} O<3,n;56Z
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publicint getStartIndex(){ 47 RY pd
return startIndex; 9,W-KM
} Zb
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publicvoid setStartIndex(int startIndex){ 8F*
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if(totalCount <= 0) }"-r;i
this.startIndex = 0; 6+5Catsn
elseif(startIndex >= totalCount) .}E)7"Qi,
this.startIndex = indexes x.yL'J\)
rTm{-b)r
[indexes.length - 1]; d0B+syl&4l
elseif(startIndex < 0) OeYLL4H
this.startIndex = 0;
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else{ 2UF94
this.startIndex = indexes _Pkh`}W:
ddP,_.0
[startIndex / pageSize]; 4I*Mc%dD
} !`_f\
} &[RU.Q!_H
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publicint getNextIndex(){ #+
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int nextIndex = getStartIndex() + ?nW#qy!R
bY~ v0kg
pageSize; YZl%JX
if(nextIndex >= totalCount) IFxI>6<&
return getStartIndex(); \2pFFVT
else L_mqC(vn
return nextIndex; jyhzLu
} zfb _ )
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publicint getPreviousIndex(){ 'I]"=O,
int previousIndex = getStartIndex() - 14!J\`rI
j\f$r,4
pageSize; v{ n}%akc
if(previousIndex < 0) l7,qWSsnK
return0; df*#?Ok
else Qiw4'xQm
return previousIndex; W_\L_)^X
} io7U[ #
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} K<6x4ha
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抽象业务类 6;frIl;
java代码: rs Uw(K^
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/** 9}cuAVI
* Created on 2005-7-12 >JPJ%~y
*/ ^:DhHqvK
package com.javaeye.common.business; Hu8atlpo
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import java.io.Serializable; z-G7Y#
import java.util.List; A}bHfn|
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import org.hibernate.Criteria; <nTmZ-;
import org.hibernate.HibernateException; `.(S#!gw
import org.hibernate.Session; hYc{9$
import org.hibernate.criterion.DetachedCriteria; @gSFvb bc
import org.hibernate.criterion.Projections; D4Y!,7WEVt
import cJ##K/es
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org.springframework.orm.hibernate3.HibernateCallback; A?D"j7JD=L
import hLbT\J`I
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org.springframework.orm.hibernate3.support.HibernateDaoS QHs:=i~VH
!N8)C@=
upport; >9<8G]vcH
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import com.javaeye.common.util.PaginationSupport; `)=A!x y
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public abstract class AbstractManager extends _d[2_b1
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HibernateDaoSupport { AIl$qPKj&
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privateboolean cacheQueries = false; A2|o=mOH
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privateString queryCacheRegion; `@$"L/AJ
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publicvoid setCacheQueries(boolean 0?F@iB~1F
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cacheQueries){ 2&gVZ z
this.cacheQueries = cacheQueries; Jn[q<e"
} 1x\VdT
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publicvoid setQueryCacheRegion(String hr<7l
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queryCacheRegion){ fmnRUN=
this.queryCacheRegion =
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queryCacheRegion; /=muj9|+s
} X40la_[.
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publicvoid save(finalObject entity){ oDW<e'Jm
getHibernateTemplate().save(entity); //X e*0
} ^A11h6I
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publicvoid persist(finalObject entity){ q!hy;K`Jd
getHibernateTemplate().save(entity); hsHVX[<5`
} Siz!/O!'
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publicvoid update(finalObject entity){ Y( 1L>4
getHibernateTemplate().update(entity); Y8J;+h9
} ,5eH2W
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publicvoid delete(finalObject entity){ }\`(m\2xo
getHibernateTemplate().delete(entity); b`h%W"|2L
} mJ8{lXq3!
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publicObject load(finalClass entity, /<(*/P,>
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finalSerializable id){ #1QX!dK+
return getHibernateTemplate().load A*7Io4e!
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(entity, id); zG-_!FIn
} CB*`
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publicObject get(finalClass entity, 6keP':bt
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finalSerializable id){ F5N>Uqr*oN
return getHibernateTemplate().get hmK8jl<6
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(entity, id); .9T.3yQ
} do:QH.q8)
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publicList findAll(finalClass entity){ Cz'xGW{
return getHibernateTemplate().find("from sg3h i"Im
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" + entity.getName()); 5Y(r\Dd
} 0zeUP{MQ
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publicList findByNamedQuery(finalString 6RK ~Dl&g
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namedQuery){ qTyg~]e9(
return getHibernateTemplate )-0[ra]
CnabD{uTf
().findByNamedQuery(namedQuery); mWNR( ()v
} $z= 0[%L
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publicList findByNamedQuery(finalString query, &g*klt'B
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finalObject parameter){ C=>B_EO
return getHibernateTemplate y7CWBTH0>
$ I#7dJ"*
().findByNamedQuery(query, parameter); Hab!qWK`
} 0;}Aj8Fle
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publicList findByNamedQuery(finalString query, 0r1g$mKb
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finalObject[] parameters){ p?Z(rCp
return getHibernateTemplate a]`itjL^
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().findByNamedQuery(query, parameters); \0D$Mie
} DYX-5~;!
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publicList find(finalString query){ M
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return getHibernateTemplate().find *]5z^>
q;7
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(query); !;i*\
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} Lj4&_b9
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publicList find(finalString query, finalObject QW2?n`Fa9-
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parameter){ ~]4kkm7Y
return getHibernateTemplate().find 2sUbiDe-
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(query, parameter); IK3qE!,&U
} )`<6taKx@n
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public PaginationSupport findPageByCriteria L%f;J/
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(final DetachedCriteria detachedCriteria){ f4
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return findPageByCriteria 0vDg8i\
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ZY)%U*jWU
} U,HIB^=
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public PaginationSupport findPageByCriteria U%q:^S%#eG
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(final DetachedCriteria detachedCriteria, finalint v~}5u
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)
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startIndex){ b_vVB`>
return findPageByCriteria dnwdFsf
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(detachedCriteria, PaginationSupport.PAGESIZE, Jh?z=JY
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startIndex); 3%2jwR
} .uKx>YB}
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public PaginationSupport findPageByCriteria T/5"}P`
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(final DetachedCriteria detachedCriteria, finalint ;R!*I%
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pageSize, <BPRV> 0X
finalint startIndex){ @zrNN>
return(PaginationSupport) U*qNix
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getHibernateTemplate().execute(new HibernateCallback(){ EE]=f=3
publicObject doInHibernate +0"x|$f~
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(Session session)throws HibernateException { #k9<
Criteria criteria = 8R}K?+]
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detachedCriteria.getExecutableCriteria(session); U(~U!O}
int totalCount = sT`^ljp4
AK *N
((Integer) criteria.setProjection(Projections.rowCount % $TEDr!
|sf*hlrJ
()).uniqueResult()).intValue(); x@m<Ym-
criteria.setProjection .*!#98pT
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(null); k_?~<vTM
List items = 8;#AO8+U7)
_]=9#Fg7{
criteria.setFirstResult(startIndex).setMaxResults X>t3|h
Pz@/|&]
(pageSize).list(); 8QF2^*RZ7z
PaginationSupport ps = @]=f?+y[ 2
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new PaginationSupport(items, totalCount, pageSize, /K|:9Q$K6
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startIndex); 7tgFDLA
return ps; 1,`H:%z%
} [M:S`{SbY
}, true); V"#Jk!k9k
} TvQ^DZbe
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public List findAllByCriteria(final eOnTW4
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DetachedCriteria detachedCriteria){ zZ=$O-&%
return(List) getHibernateTemplate -@M3Dwsi3
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().execute(new HibernateCallback(){ DMZ`Sx
publicObject doInHibernate tZA:
&?+WXL>
(Session session)throws HibernateException { 0@pu@ DP~
Criteria criteria = n"G`b
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detachedCriteria.getExecutableCriteria(session); w`gyE
6A
return criteria.list(); M"U OgS
} d?hz LX
}, true); #?&0D>E?k
} QCpM|,drS
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public int getCountByCriteria(final sLns3&n2
nl
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DetachedCriteria detachedCriteria){ Y~qb;N\
Integer count = (Integer) CWlW/>yF
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@`|)Ia<
getHibernateTemplate().execute(new HibernateCallback(){ S "
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publicObject doInHibernate -9o{vmB{
s@!$='|
(Session session)throws HibernateException { \##5O7/1
Criteria criteria = Qn=$8!Qqa
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detachedCriteria.getExecutableCriteria(session); G/{
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return lTz6"/
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criteria.setProjection(Projections.rowCount {gU&%j
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()).uniqueResult(); (-"`,8K 2}
}
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}, true); !buz<h
return count.intValue(); (E!!pz
} n&!+wcJ;Yt
} &Lt@} 7$8
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用户在web层构造查询条件detachedCriteria,和可选的 h$fe -G#
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 $YM_G=k
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PaginationSupport的实例ps。 'Q|c@t
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ps.getItems()得到已分页好的结果集 FpVV4D
ps.getIndexes()得到分页索引的数组 {#hVD4$b
ps.getTotalCount()得到总结果数 )bDnbO$s_
ps.getStartIndex()当前分页索引 I3) Zr+
ps.getNextIndex()下一页索引 (:sZ
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ps.getPreviousIndex()上一页索引 U[||~FW'
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 A3R#z]Ub
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 tT5pggml
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一下代码重构了。 CL9yEy"V
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我把原本我的做法也提供出来供大家讨论吧: yrr)
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首先,为了实现分页查询,我封装了一个Page类: +^ yq;z
java代码: V|FrN*m
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/*Created on 2005-4-14*/ iRw&49
package org.flyware.util.page; Yl({)qK{
z2 hFn&
/** .<&s%{EW
* @author Joa 1r9 f[j~
* pn%#w*'
*/ PCE4W^ns
publicclass Page { \N6\v5vh
P:{<*`q
/** imply if the page has previous page */ 97`WMs
privateboolean hasPrePage; 82:Wvp6
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/** imply if the page has next page */ V3s L;
privateboolean hasNextPage; &M[f&_"8Q
!:0v{ZQ
/** the number of every page */ 8q^o.+9
privateint everyPage; RFfIF]~3
f =s&n}
/** the total page number */ )K]pnH|
privateint totalPage; #h'@5 l
ALT^8c&K
/** the number of current page */ s] au/T6b
privateint currentPage; E^V|
jna;0)
/** the begin index of the records by the current _D;@v?n6!O
0D ~
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query */ }DjYGMrTB
privateint beginIndex; bbN%$/d
+t!S'|C
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/** The default constructor */ ZxHJ<2oD
public Page(){ 9lzQ\}
7+,vTsCd
} M\oVA=d\0
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/** construct the page by everyPage 4<S'
* @param everyPage {=Q7m`1
* */ >lzA]aM$c
public Page(int everyPage){ +l0g`:
this.everyPage = everyPage; ^twivNB
} 3YL
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/** The whole constructor */ ~(X(&
public Page(boolean hasPrePage, boolean hasNextPage, E3l*8F%<3
K~6e5D7.
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64
int everyPage, int totalPage, Paf%rv2
int currentPage, int beginIndex){ oh-|'5+,;h
this.hasPrePage = hasPrePage; >FF5x#^&c
this.hasNextPage = hasNextPage; i!H!;z#
this.everyPage = everyPage; L'A)6^d@S
this.totalPage = totalPage; :1wrVU-?h
this.currentPage = currentPage; ^4>k%d
this.beginIndex = beginIndex; /DFV$+9
} pmc=NTr&<
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/** B(5c9DI`
* @return vfc[p ^
* Returns the beginIndex. Z|m`7xeCy
*/ vzo4g,Bj
publicint getBeginIndex(){ *VeW?mY,P
return beginIndex; 4B[D/kIg
} R)8s
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/** C*kK)6v`
* @param beginIndex ?+C V1 ]
* The beginIndex to set. lU4}B`#"v
*/ Y%`SHe7M
publicvoid setBeginIndex(int beginIndex){ > 0>
this.beginIndex = beginIndex; Kx`/\u=/
} d5m`Bm-{
0~WF{_0|
/** +OaUP*\Dd
* @return .T B"eUy
* Returns the currentPage. Qs 2.ef?
*/ YV'pVO'_+
publicint getCurrentPage(){ #;VA5<M8
return currentPage; #@.-B,]
} @_ygnNn4R
k[|~NLB8
/** tNaL;0#Tx
* @param currentPage ~f>2U]F>5
* The currentPage to set. |F$BvCg
*/ DT(d@upH
publicvoid setCurrentPage(int currentPage){ Xz{~3ih
this.currentPage = currentPage; QV|>4 ^1D
}
m]Y;c_DO:
s}5+3f$f
/** U]6&b
* @return \}*k)$r
* Returns the everyPage. A$/\1282
*/ $hrIO+
publicint getEveryPage(){ k-LEI}h
return everyPage; fL*T3[d
} \1%l^dE@
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/** (#\pQ51
* @param everyPage
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* The everyPage to set. F3U` ueP
*/ c@(&[/q!
publicvoid setEveryPage(int everyPage){ fRZ KEIyk
this.everyPage = everyPage; JgRYljQi2
} b{M7w
\fWW'
/** {d3<W N
* @return 0$ .m_0H
* Returns the hasNextPage. 63WS7s"
*/ \[:/CxP
publicboolean getHasNextPage(){ U
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return hasNextPage; V\5 L?}
} *Ust[u
}CGSEr4'w~
/** bJ /5|E?
* @param hasNextPage gN6rp(?y
* The hasNextPage to set. RD,5AShP
*/ <W)u{KS#TY
publicvoid setHasNextPage(boolean hasNextPage){ kJ:F *34e=
this.hasNextPage = hasNextPage; T(?HMyg3
}
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25y6a|`
/** 5II(mSg8
* @return cgu~
* Returns the hasPrePage. &BE
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*/ 'T=~jA7SkT
publicboolean getHasPrePage(){ RJeDEYXeg
return hasPrePage; ef! XV7P
} o]n!(f<(*
Bf`9V713
/** F^$led1/F
* @param hasPrePage -Y 9SngxM
* The hasPrePage to set. eW'2AT?2H%
*/ tvKAIwe
publicvoid setHasPrePage(boolean hasPrePage){ 0JuD^
this.hasPrePage = hasPrePage; <+j)P4O4
} 2S3lsp5!
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/** Z#l%r0(o
* @return Returns the totalPage. MTGiAFE
* b,TiMf9},h
*/ &)F*@C-
publicint getTotalPage(){ I&|f'pn^<
return totalPage; smY$-v)@
} qm*}U3K
uQb!= ]
/** CI:^\-z
* @param totalPage )3<:tV8
* The totalPage to set. 4M&`$Wim
*/ &ZHC-qMRK
publicvoid setTotalPage(int totalPage){ %#L]]-%
this.totalPage = totalPage; ^E`(*J/o
} |%a4`w
rx"s!y{!-
} ;^Sr"v6r>u
ysIh[1E~%:
|wE3UWsy
Y<"7x#AB!
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 ^\:8w0Y^
'V+dBt3
个PageUtil,负责对Page对象进行构造: l&YKD,H};
java代码: *1Z5+uVT[
OX:O^ (-r,
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/*Created on 2005-4-14*/ 6&Juv
package org.flyware.util.page; 88"Sai
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import org.apache.commons.logging.Log; V(MFna)
import org.apache.commons.logging.LogFactory; |IoB?^_h
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/** e
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* @author Joa w=h1pwY
* Z}A%=Z\/3
*/ ./j,Z$|
publicclass PageUtil { y %$O-q
;|p$\26S)%
privatestaticfinal Log logger = LogFactory.getLog :4)Qt
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(PageUtil.class); 0n ~ Zz
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/** X0;4_,=
* Use the origin page to create a new page $P7iRM]
* @param page %S`
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* @param totalRecords ;g_>
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* @return q{2I_[p
*/ ,
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publicstatic Page createPage(Page page, int G'zF)0oD
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totalRecords){ \?j E#^
return createPage(page.getEveryPage(), {k.MS-q
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page.getCurrentPage(), totalRecords); N!Qg; (
} cWGDee(
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/** 5F t5@UF~
* the basic page utils not including exception 5G0$
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handler DcMJ^=r8O:
* @param everyPage S0g'r
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* @param currentPage y~
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* @param totalRecords _UE)*l m+
* @return page p5O",3,A4
*/ 3'c\;1lhT
publicstatic Page createPage(int everyPage, int bi ozZ
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currentPage, int totalRecords){ 58%'UwKn
everyPage = getEveryPage(everyPage); /sR%]q
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currentPage = getCurrentPage(currentPage); d0hhMx6$
int beginIndex = getBeginIndex(everyPage, zJ+8FWy:S
'`Bm'Dd
currentPage); )CI1;
int totalPage = getTotalPage(everyPage, a"/#+=[
Xd:7"/:r
totalRecords); &`Y!;@K9W#
boolean hasNextPage = hasNextPage(currentPage, juAMAplf
0Iud$Lu
totalPage); + SZYg[
boolean hasPrePage = hasPrePage(currentPage); ^1:U'jIXO
D3Jr3
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returnnew Page(hasPrePage, hasNextPage, 1%M&CX
everyPage, totalPage, Ub0/r$]DK
currentPage, -K(fh#<6KO
*O:r7_ Y0
beginIndex); r
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} ?^'
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privatestaticint getEveryPage(int everyPage){
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return everyPage == 0 ? 10 : everyPage; {)- .xG
} Bhqft;Nuh
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privatestaticint getCurrentPage(int currentPage){ QQk{\PV
return currentPage == 0 ? 1 : currentPage; IUGz =%[
} y AF+bCXo
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privatestaticint getBeginIndex(int everyPage, int h9$ Fx
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currentPage){ s"=6{EVqk3
return(currentPage - 1) * everyPage; bLz*A-
} Xqp|VbDca
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privatestaticint getTotalPage(int everyPage, int wI M{pK
tC8(XMVx
totalRecords){ 3<|`0pt}
int totalPage = 0; ^x*nq3^h\
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if(totalRecords % everyPage == 0) n?#!VN3
totalPage = totalRecords / everyPage; 78n=nHS
else U5Erm6U:
totalPage = totalRecords / everyPage + 1 ; R7oj#
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return totalPage; dGZntT2D
} #Z=tJ
hlvt$Jwq
privatestaticboolean hasPrePage(int currentPage){ < V\Y@Ei+
return currentPage == 1 ? false : true; 8B!aO/Km
} lJykyyCY+
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privatestaticboolean hasNextPage(int currentPage, KH KS$D
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int totalPage){ m!XI {F@x
return currentPage == totalPage || totalPage == pl*~kG=
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0 ? false : true; ~>G]_H]?
} u]C`6)>
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} (J$\-a7<f
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 ~KjJ\b)R
lYf+V8{
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 WiNT;v[
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做法如下: Ftb%{[0}u3
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 ]*"s\ix
X[C3&NX#_
的信息,和一个结果集List: x
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java代码: jX=lAs~6
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/*Created on 2005-6-13*/ &!.HuRiuC
package com.adt.bo; <T,A&`/
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import java.util.List; _fTwmnA
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import org.flyware.util.page.Page; XaI;2fMGI
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/** rp!
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* @author Joa ;Kxbg>U
*/ O>r-]0DI[
publicclass Result { ]o.vB}WsY
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private Page page; -mNQ;zI1
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private List content; pck >;V
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/** :{g7lTM
* The default constructor G"s0GpvQ
*/ ,cHU) j
public Result(){ #Fd W/y5
super(); '8Wv.X0`
} Fxd{ Zk`
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/** TYS\95<
* The constructor using fields 9Ld9N;rWm#
* H3FW52pjX
* @param page - V) R<
* @param content )*1.eObhL
*/ T-L5zu
public Result(Page page, List content){ Q|hm1q
this.page = page; x!{
this.content = content; @ RR\lZ
} tB6k|cPC
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/** 1M5 -pZ[D
* @return Returns the content. o" _=K%9
*/ mN1Ssq"B
publicList getContent(){ }C6@c1myq-
return content; E20&hc5 8
} 3]}'TA`v
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/** F>Jg~ FD*
* @return Returns the page. QlzQ]:dWC
*/ M []OHw
public Page getPage(){ vjK, I9
return page; p5*lEz|$
} ,b'4CF
qi=3L
/** #)74X%4(
* @param content 1j3=o }m
* The content to set. rihlae5Kz
*/ ROoE%%8I
public void setContent(List content){ 'j79GC0
this.content = content; \3^Pjx
} 1%eLs=u?
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/** T-P@u-DU
* @param page L>nO:`>h
* The page to set. R<g =\XO'y
*/ <xF?~7
publicvoid setPage(Page page){ M {x ie
this.page = page; 3
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} O,9X8$5H-a
} N1?
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2. 编写业务逻辑接口,并实现它(UserManager, 9p<:LZd~
# U`&jBU
UserManagerImpl) r}@< K
java代码: I"V3+2e
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/*Created on 2005-7-15*/ a}D&$yz2
package com.adt.service; r %xB8e9
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import net.sf.hibernate.HibernateException; ddMM74
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import org.flyware.util.page.Page; Ap,q
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import com.adt.bo.Result; HjPH
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/** .Bijc G
* @author Joa "b;k.Fx
*/ Z{16S=0
publicinterface UserManager { GD/nR4$
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public Result listUser(Page page)throws ,,2_/u\"/i
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HibernateException; Cj=J;^vf
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} X)FQ%(H<
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^:$j:w?j
java代码: *xho
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/*Created on 2005-7-15*/ &A#90xzF
package com.adt.service.impl; OQ
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import java.util.List; 5"]aZMua
!FO:^P
import net.sf.hibernate.HibernateException; A`
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import org.flyware.util.page.Page; (rMTW+,
import org.flyware.util.page.PageUtil; 72%
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import com.adt.bo.Result; ">0 /8] l
import com.adt.dao.UserDAO; 8Na}Wp;|Gi
import com.adt.exception.ObjectNotFoundException; y0lL Fe~
import com.adt.service.UserManager; FkLQBpp(x
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/** !k ;[^>
* @author Joa 1j8 /4:
*/ p` ^:Q*C"
publicclass UserManagerImpl implements UserManager { Ni/|C19Z
DB!uv[c
private UserDAO userDAO; B&to&|jf
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/**
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* @param userDAO The userDAO to set. =2Pz$q*ub
*/ QLxXp
publicvoid setUserDAO(UserDAO userDAO){ 8yNRxiW:
this.userDAO = userDAO;
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} %!1@aL]pQ
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/* (non-Javadoc) jLpgWt`8)E
* @see com.adt.service.UserManager#listUser Vu^Q4Z
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(org.flyware.util.page.Page) lU>)n
*/ .oW~:mY
public Result listUser(Page page)throws :C}KI)
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HibernateException, ObjectNotFoundException { ;5zjd,
int totalRecords = userDAO.getUserCount(); /i\uwa,
if(totalRecords == 0) 50O7=
throw new ObjectNotFoundException Wl@0TUK
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("userNotExist"); |sDG>Zq?
page = PageUtil.createPage(page, totalRecords); U:C-\ M
List users = userDAO.getUserByPage(page); |~1rKzZwF
returnnew Result(page, users); mRix0XBI~
} +"*l2E]5
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} BHiw!S<
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其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 Q*oA{eZY
v{\n^|=])
询,接下来编写UserDAO的代码: !nqm ;96
3. UserDAO 和 UserDAOImpl: 1GyA QHx,
java代码: )U3 H15
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/*Created on 2005-7-15*/ ,AFC 1t[0
package com.adt.dao; `eA&C4oFOO
Sj=69>m]5
import java.util.List;
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, L AJ
import org.flyware.util.page.Page; ?Pok-90
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import net.sf.hibernate.HibernateException; _g/TH-;^
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/** d
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* @author Joa ?AM8*w
*/ WEY97_@
publicinterface UserDAO extends BaseDAO { v1tN
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publicList getUserByName(String name)throws 7T(OV<q;#
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HibernateException; fuIv,lDA
H--*[3".
publicint getUserCount()throws HibernateException; 7! A%6
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publicList getUserByPage(Page page)throws h1UlLy8
wDC/w[4:
HibernateException; )su
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} ba)YbP[
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java代码: 94k)a8-!
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/*Created on 2005-7-15*/ ?GD?J(S
package com.adt.dao.impl; r)@&2b"q
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import java.util.List; ))+98iU1s
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import org.flyware.util.page.Page; o:Os_NaD
V]PhXVJ
import net.sf.hibernate.HibernateException; rj f=qh5s
import net.sf.hibernate.Query; $?J LCa
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import com.adt.dao.UserDAO; a]=vq(N'r
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/** sq(063l
* @author Joa kpreTeA]
*/ U.j\u>a
public class UserDAOImpl extends BaseDAOHibernateImpl 6UAxl3-\
yLIj4bf
implements UserDAO { T _9ZI|Jx
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/* (non-Javadoc) a:%5.!Vd
* @see com.adt.dao.UserDAO#getUserByName 0}7Rm>
<GmrKdM
(java.lang.String) xS-nO_t 'E
*/ ^?.:}
publicList getUserByName(String name)throws 8cPf0p:
<7-,`
HibernateException { @`+$d=rO`
String querySentence = "FROM user in class BG? 2PO{
LOG*K;v3
com.adt.po.User WHERE user.name=:name"; GvtI-\h]
Query query = getSession().createQuery IS*"_o<AR
vKOn7
(querySentence); KXbYv62
query.setParameter("name", name); wQuaB6E
return query.list(); U)=Z&($T
} ]B'
<WKz,jh
/* (non-Javadoc) 5%aKlx9^#
* @see com.adt.dao.UserDAO#getUserCount() iZUz6
*/
(mD:[|.
publicint getUserCount()throws HibernateException { x<7` 109]
int count = 0; Tq; "_s
String querySentence = "SELECT count(*) FROM kJpHhAn4
1xV1#'@[Jd
user in class com.adt.po.User"; <=2*UD |
Query query = getSession().createQuery uqeWdj*Y
Kf<_A{s
(querySentence); CIvT5^}
count = ((Integer)query.iterate().next (gC^5&11
MW@b;=(
()).intValue(); @gGuV$Mw
return count; F(fr,m3
} Tka="eyIj3
Zo ReyY2
/* (non-Javadoc) zVLi
* @see com.adt.dao.UserDAO#getUserByPage kV9NFo22
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(org.flyware.util.page.Page) x&b-Na