Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 CFRo>G
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ;M@/AAZ
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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 MFE~bU(h
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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 6M612
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分页支持类: b4oZ@gVR;
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java代码: X1tAV>k5'L
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package com.javaeye.common.util; c @2s!bs
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import java.util.List; LR-op?W
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publicclass PaginationSupport { ;rd!kFd#bq
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publicfinalstaticint PAGESIZE = 30; )Cu"M#`
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privateint pageSize = PAGESIZE; TtkB
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privateList items; Oyj!N`&z@
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privateint totalCount; |iO2,99i
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privateint[] indexes = newint[0]; 0~an\4nh
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privateint startIndex = 0; N
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public PaginationSupport(List items, int 1)%9h>F7
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totalCount){ MEq
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setPageSize(PAGESIZE); 0D$+WX
setTotalCount(totalCount); 6j_
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setItems(items); LT2mwJl
setStartIndex(0); WmOd1
} |D`Zi>lv
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public PaginationSupport(List items, int Ww)qBsi8
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totalCount, int startIndex){ N \A)P
setPageSize(PAGESIZE); 5vg@zH\z
setTotalCount(totalCount); ]7'Q2OU7
setItems(items); }ndH|,
setStartIndex(startIndex); 3#0nus|=S
} PJh\U1Z
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public PaginationSupport(List items, int j0:F E
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totalCount, int pageSize, int startIndex){ 0+cRUH9Ew
setPageSize(pageSize); ]O&TU X@)
setTotalCount(totalCount); qX-Jpi P
setItems(items); So0YvhZ+
setStartIndex(startIndex); r{6 ,;
} kpK:@
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publicList getItems(){ AVyo)=&
return items; ROQk^
} $ZwsTV]x
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publicvoid setItems(List items){ KC8A22
this.items = items; L=zeFn
} bF?EuL
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publicint getPageSize(){ X+bLLW>&
return pageSize; 6Y\9h)1Jo
} Njz,y}\
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publicvoid setPageSize(int pageSize){ v8-F;>H
this.pageSize = pageSize; _qJ[~'m<^C
} 2ORWdR.b
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publicint getTotalCount(){ 49HtI9@
return totalCount; Q.M3rRh
} K& 2p<\2
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publicvoid setTotalCount(int totalCount){ 1pO ;aG1O
if(totalCount > 0){ q:1 1XPP
this.totalCount = totalCount; 6t/})Xv
int count = totalCount / E(]yjZ/
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pageSize; U5izOFc
if(totalCount % pageSize > 0) _.Uz!2
count++; n1buE1r?
indexes = newint[count]; R/<
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for(int i = 0; i < count; i++){ r/3!~??x
indexes = pageSize * OkA-=M)RI:
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i; +<bq@.x
} "Z}0 A/y
}else{ #; }IHAR
this.totalCount = 0; V/>SjUNq
} v`x~O+
} ^/Gjk
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publicint[] getIndexes(){ kDO6:sjR7
return indexes; fbo64$!hZ
} `acorfpi
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publicvoid setIndexes(int[] indexes){ ^b>E_u
this.indexes = indexes; pPG!{:YT
} fBw+Y4nCO7
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publicint getStartIndex(){ d'Gv \i&e
return startIndex; z?1GJ8
} |byB7f
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publicvoid setStartIndex(int startIndex){ n'4D ;4
if(totalCount <= 0) |[k6X=5
this.startIndex = 0; X] Tb4
elseif(startIndex >= totalCount) _mXq]r0
this.startIndex = indexes =CRaMjN
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[indexes.length - 1]; 4B (*{
elseif(startIndex < 0) K%Q^2"Eb0
this.startIndex = 0; Mt@K01MI%
else{ &sx/qS#,VL
this.startIndex = indexes {
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[startIndex / pageSize]; n (cSfT
} \2eYw.I=
} }})4S;j
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publicint getNextIndex(){ ,EwJg69
int nextIndex = getStartIndex() + -cq ~\m^6
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pageSize; Ie4*#N_
if(nextIndex >= totalCount) uz'beE
return getStartIndex(); |W:kzTT-T
else ua7I K~8l
return nextIndex; ~}4H=[Zu
} nwcT8b87J
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publicint getPreviousIndex(){ :GL|:
int previousIndex = getStartIndex() -
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pageSize; :MJBbrV
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if(previousIndex < 0) / HaS.
return0; :p8JO:g9
else ?7a<V+V:
return previousIndex; C .YtjLQP$
} rw+0<r3|K
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} .fD k5uo
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抽象业务类 \ 0<e#0-V
java代码: %$sWNn
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/** _Q.3X[88C
* Created on 2005-7-12
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*/ 8
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package com.javaeye.common.business; *bv
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import java.io.Serializable; m^]/
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import java.util.List; f<kL}B+,Og
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import org.hibernate.Criteria; cpE&Fba}"
import org.hibernate.HibernateException; wQ[2yq
import org.hibernate.Session; y)(SS8JR
import org.hibernate.criterion.DetachedCriteria; JanLJe)
import org.hibernate.criterion.Projections; \N"K^kR4
import rt~X(S
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org.springframework.orm.hibernate3.HibernateCallback; by8d18:it
import zh50]tX
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org.springframework.orm.hibernate3.support.HibernateDaoS =4Ex'
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upport; fJ\Ys;l[j
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import com.javaeye.common.util.PaginationSupport; bXC
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public abstract class AbstractManager extends T6phD8#
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HibernateDaoSupport { P<2yCovn`
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privateboolean cacheQueries = false; r-Dcc;+=Q
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privateString queryCacheRegion; #UXmTrZ.
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publicvoid setCacheQueries(boolean %Yd}},X_E
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cacheQueries){ k?xtZ,n{s
this.cacheQueries = cacheQueries; \uanQ|Nu
} 2d1'!B
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publicvoid setQueryCacheRegion(String J`"1DlH
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queryCacheRegion){ lfI[r|
this.queryCacheRegion = " _q5\]z\O
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queryCacheRegion; )k7`!@ID
} yUH8
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publicvoid save(finalObject entity){ |AWu0h\keO
getHibernateTemplate().save(entity); }3?M0 :
} =M(\ R8
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publicvoid persist(finalObject entity){ =20Q!wcu
getHibernateTemplate().save(entity); RbrvY
} ,][+:fvS
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publicvoid update(finalObject entity){ pr;L~$JW
getHibernateTemplate().update(entity); YHKm{A ]
} z*9/ "M
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publicvoid delete(finalObject entity){ P, S9gG9
getHibernateTemplate().delete(entity); 4AF"+L
} f-{[ushj
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publicObject load(finalClass entity, EO|
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finalSerializable id){ S?8q.59
return getHibernateTemplate().load `I'=d4
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(entity, id); JBWiTUk
} ZFdQZ=.'
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publicObject get(finalClass entity, sO(K po9jq
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finalSerializable id){ k)4|%
return getHibernateTemplate().get *dK A/.g
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(entity, id); YJ75dXc&&
} ueWG/`ig
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publicList findAll(finalClass entity){ c6lEWC:
return getHibernateTemplate().find("from kbMIMZC/G
(bT\HW%m
" + entity.getName()); L>@6lhD)x
} 3\'.1p
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publicList findByNamedQuery(finalString |Ec $%
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namedQuery){ ~F' $p
return getHibernateTemplate \!YPht
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().findByNamedQuery(namedQuery); 2nEj
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} FlkAo]
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publicList findByNamedQuery(finalString query, Gwvs~jN
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finalObject parameter){ $[|8bE
return getHibernateTemplate "0/OpT7h7
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().findByNamedQuery(query, parameter); y'zEaL&SI@
} atN`w=6A`
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publicList findByNamedQuery(finalString query, -}N{'S,Bp
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finalObject[] parameters){ AN.` tv
return getHibernateTemplate 2ag]p
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().findByNamedQuery(query, parameters); riBT5
} >?tcL *
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publicList find(finalString query){ p 3_Q
return getHibernateTemplate().find n"MFC
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(query); UPgZj\t%{
} G A7
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publicList find(finalString query, finalObject r":<1+07
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parameter){ |Y])|`_'G
return getHibernateTemplate().find 2cmqtlW"
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(query, parameter); i"-#1vy=
} +ATN2
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public PaginationSupport findPageByCriteria D<rjxP
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(final DetachedCriteria detachedCriteria){ Z
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return findPageByCriteria q,*IR*B:a
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); C'=C^X%
} ;pU LJ}rDb
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public PaginationSupport findPageByCriteria Xz5=fj&
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(final DetachedCriteria detachedCriteria, finalint ),~Ca'TU
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startIndex){ MT V'!Zxs
return findPageByCriteria /`'50Cj
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(detachedCriteria, PaginationSupport.PAGESIZE, zY#U ]Is
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startIndex); +0=RC^
} *PMql $
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public PaginationSupport findPageByCriteria ,)Q mQ^/
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(final DetachedCriteria detachedCriteria, finalint / _cOg? o
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pageSize, 8F@6^9C
finalint startIndex){ (Ux%7H_d
return(PaginationSupport) $ &^
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getHibernateTemplate().execute(new HibernateCallback(){ `V?{
publicObject doInHibernate >Ek`PVPD
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(Session session)throws HibernateException { >*_?^F_
Criteria criteria = _>aesp%
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detachedCriteria.getExecutableCriteria(session); $GPA6
int totalCount = j&&^PH9ZY
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((Integer) criteria.setProjection(Projections.rowCount Y] n^(V
+(P;4ZOmB
()).uniqueResult()).intValue(); G_o/ lIz"
criteria.setProjection Onc!5L
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(null); s/T5aJR
List items = Dnp^yqz*
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criteria.setFirstResult(startIndex).setMaxResults R4v=i)A~Z
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(pageSize).list(); 2HTZ,W
PaginationSupport ps = KS|$_-7u
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new PaginationSupport(items, totalCount, pageSize, -\I0*L'$|\
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startIndex); @vv`86bm
return ps; *r %
} %v|,-B7Yx
}, true); 2
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} ,sc>~B@Q
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public List findAllByCriteria(final *i\7dJ Dj
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DetachedCriteria detachedCriteria){ NT-du$!u
return(List) getHibernateTemplate r>G$u
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().execute(new HibernateCallback(){ Y#Z&$&n
publicObject doInHibernate oFsMQ Py
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(Session session)throws HibernateException { <W5F~K
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Criteria criteria = 0\mM^+fO
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detachedCriteria.getExecutableCriteria(session); ogPfz/ hw
return criteria.list(); \
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} 4dy)g)wM
}, true); QvqBT
} &?9.Y,
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public int getCountByCriteria(final Zc"]Cv(
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DetachedCriteria detachedCriteria){ g\^(>Ouc
Integer count = (Integer) ({8Q=Gh
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getHibernateTemplate().execute(new HibernateCallback(){ +I/P5OGRN
publicObject doInHibernate ngNg1zV/q
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(Session session)throws HibernateException { `S.;&%B\
Criteria criteria = qS7*.E~j|]
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detachedCriteria.getExecutableCriteria(session); #{]=>n)j
return Vxw?"mhP
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criteria.setProjection(Projections.rowCount `t8e2?GH
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()).uniqueResult(); [Y:HVr,
} --]\z* x
}, true); ~#-`Qh
return count.intValue(); "zv+|_ZAfd
} K@d`jb4T
} ElYHA
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用户在web层构造查询条件detachedCriteria,和可选的 Jv7M[SJ#x
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 u!X2ju<
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PaginationSupport的实例ps。 1.>`h:
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ps.getItems()得到已分页好的结果集 V*/))n?
ps.getIndexes()得到分页索引的数组 3;Xs`dk
ps.getTotalCount()得到总结果数 X~j
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ps.getStartIndex()当前分页索引 7/~"\nN:/
ps.getNextIndex()下一页索引 N*z<VZ
ps.getPreviousIndex()上一页索引 E O}(MXS
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 pjoI};
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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 3C[ ;2
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一下代码重构了。 o3`Z@-.G
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我把原本我的做法也提供出来供大家讨论吧: ?/u&U\P
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首先,为了实现分页查询,我封装了一个Page类: ;3-ssF}k*
java代码: TLkkB09fvk
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/*Created on 2005-4-14*/ g-]td8}#
package org.flyware.util.page; kiECJ@5p
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/** 8(+X0}
* @author Joa Psv-y
* )/=J=xw2
*/ Cz(Pj S
publicclass Page { R52!pB0[
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/** imply if the page has previous page */ h(zi$V
privateboolean hasPrePage; 1"e=Zqn$)
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/** imply if the page has next page */ N7e^XUG
privateboolean hasNextPage; ?K]k(ZV_+Y
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/** the number of every page */ 4C2 Dwj
privateint everyPage; WH/a#F
Ylf 6-FbF
/** the total page number */ hVID~L$
privateint totalPage; \jfW$TtZm
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/** the number of current page */ E85 03
privateint currentPage; aCTVY1
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/** the begin index of the records by the current Fb*;5VNU.
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query */ $X{& KLM[
privateint beginIndex; [R~HhM
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/** The default constructor */ 7,jqA"9
public Page(){ 7Jqp2\
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} [IYs4Y5
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/** construct the page by everyPage ''(T3;^ +
* @param everyPage 0 Hq$h
* */ 9 (&!>z
public Page(int everyPage){ 6-^+btl)#
this.everyPage = everyPage; "3v%|
} d,>l;l
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/** The whole constructor */ ~:0h o
public Page(boolean hasPrePage, boolean hasNextPage, .=NK^
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int everyPage, int totalPage, `j2z=5
int currentPage, int beginIndex){ 6m{3GKaW~
this.hasPrePage = hasPrePage; 63~i6
this.hasNextPage = hasNextPage; \ pq]q
this.everyPage = everyPage; i.#s'm.9
this.totalPage = totalPage; IQ|~d08}
this.currentPage = currentPage; WT0U)x( m5
this.beginIndex = beginIndex; b
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} B>'\g
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/** 5yQgGd)
* @return M"J$c42
* Returns the beginIndex. bySw#h_
*/ 8Ej2JMc
publicint getBeginIndex(){ p&q&Fr-
return beginIndex; )PwDP
} BvYJ!Vj
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/** UR\*KR;yM
* @param beginIndex jjwY{jV
* The beginIndex to set. fu|I(^NV
*/ e]5QqM7
publicvoid setBeginIndex(int beginIndex){ e5AiIVlv
this.beginIndex = beginIndex; I7}[%(~Sf/
} &2g1Oy~
}b{N[
/** 1\3n
* @return 7+z%O3k'I
* Returns the currentPage. +F@9AO>LF
*/ $DQMN
publicint getCurrentPage(){ g6~uf4;
return currentPage; h;Bol
} :xA'X+d/'
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/** 6dNo!$C^
* @param currentPage ;+5eE`]a/L
* The currentPage to set. 7[K$os5al
*/ %8v?dB;>x`
publicvoid setCurrentPage(int currentPage){ 68D.Li
this.currentPage = currentPage; uX p0D$a
} LX3 5Lt
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/** L-Hl.UV
* @return |+[bKqI5
* Returns the everyPage. 5bAy@n
*/ !W6]+
publicint getEveryPage(){ [#.QDe
return everyPage; .NPai4V'
} m*(8I=]q
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/** ]v+\v re
* @param everyPage U>{z*D
* The everyPage to set. :0]KIybt
*/ X2EC+<
publicvoid setEveryPage(int everyPage){ &<~`?-c
this.everyPage = everyPage; K/08F|]a
} Xf.SJ8G
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/** 5` Q#2
* @return }96^OQPE
* Returns the hasNextPage. {5RM)J1
*/ ;Neld #%J
publicboolean getHasNextPage(){ PsTwJLY
return hasNextPage; qEywExdiu
} J0{0B=d;
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/** Y(-+>>j_
* @param hasNextPage >`t
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* The hasNextPage to set. [aIQ/&