Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ))T@U?r
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 $4>(}
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 5Zf^co u
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 vEy0DHEE
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分页支持类: iGq%|o>
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java代码: IRhi1{K$"
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package com.javaeye.common.util; is~"yE7
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import java.util.List; N5PW]
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publicclass PaginationSupport { Ky0}phGRu
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publicfinalstaticint PAGESIZE = 30; ^VC/tJ
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privateint pageSize = PAGESIZE; }Q2v~eD
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privateList items; ]?<
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privateint totalCount; *S xDwN
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privateint[] indexes = newint[0]; FR9w0{o
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privateint startIndex = 0; V`
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public PaginationSupport(List items, int OV
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totalCount){ Iuyq!R4:7
setPageSize(PAGESIZE); ZUyS+60
setTotalCount(totalCount); z*a-=w0
setItems(items); ~8 B]
setStartIndex(0); f+cN'jH
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} 3"BSP3/[l
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public PaginationSupport(List items, int 0OXl`V`w
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totalCount, int startIndex){ 1[yy/v'q
setPageSize(PAGESIZE); YdZ9##IU3
setTotalCount(totalCount); <4LW.q
setItems(items); F?z:[1(:
setStartIndex(startIndex); vfd<qdi3p(
} /0sw rt.
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public PaginationSupport(List items, int }qw->+nD
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totalCount, int pageSize, int startIndex){ MY60%
setPageSize(pageSize); eRqPZb"6MR
setTotalCount(totalCount); `fuQt4
setItems(items); s=e`}4
setStartIndex(startIndex); DPlDuUOd
} f,|g|&C
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publicList getItems(){ 0 <E2^
return items; eB&.keO
} "Xg~1)%
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publicvoid setItems(List items){ 2 \<u;9
this.items = items; BM~6P|&qD
} X"jL
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publicint getPageSize(){ /F$E)qN7n
return pageSize; P BVF'~f@j
} vM@8&,;
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publicvoid setPageSize(int pageSize){ fN1b+d~*6
this.pageSize = pageSize; Vx}e,(i
} 6HguZ_jC
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publicint getTotalCount(){ DfU]+;AE
return totalCount; x5Ue"RMl+
} QuP)j1"X
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publicvoid setTotalCount(int totalCount){ bv;.6C(T<
if(totalCount > 0){ v.-r %j{I
this.totalCount = totalCount; d8uDSy
int count = totalCount / ]K3bDU~
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pageSize; V'tqsKQ!
if(totalCount % pageSize > 0) q;lR|NOh
count++; Q:j~
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indexes = newint[count]; Ma'#5)D
for(int i = 0; i < count; i++){ C B`7KK
indexes = pageSize * [8<0Q_?,
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} Rt5,/Q0
}else{ i)] f0F
this.totalCount = 0; oiIl\#C
} VJ8'T"^Hf
} *;(^)Sj4Q
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publicint[] getIndexes(){ 9Trk&OB
return indexes; FWB
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} I94-#*~I
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publicvoid setIndexes(int[] indexes){ \#PZZH%
this.indexes = indexes; .EPv4[2%F8
} Qqi?DW1)-
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publicint getStartIndex(){ Uqz.Q\A
return startIndex; QI'-I\Co
} )@p?4XsT4J
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publicvoid setStartIndex(int startIndex){ Q_Br{
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if(totalCount <= 0) M KX+'p\w
this.startIndex = 0; LzJ`@0RrX
elseif(startIndex >= totalCount) <$@I*xk[
this.startIndex = indexes bEB2q\|Je
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[indexes.length - 1]; Y]_$+Si:NK
elseif(startIndex < 0) |g>Q3E
this.startIndex = 0; )+"5($~
else{ n=PfV3B
this.startIndex = indexes u(fZ^
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[startIndex / pageSize]; L
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} }OhSCH'o6
} o<J6KTLv
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publicint getNextIndex(){
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int nextIndex = getStartIndex() + L+VQtp&"
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pageSize; s_}6#;
if(nextIndex >= totalCount) , O/IY
return getStartIndex(); :5['V#(o
else Ozhn`9L+1!
return nextIndex; 6"
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} ]=%6n@z'
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publicint getPreviousIndex(){ $Mj\ 3
int previousIndex = getStartIndex() - q2r$j\L%
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pageSize; mBJr*_p
if(previousIndex < 0) @e& 0Wk
return0; }zS5o
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else H]
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return previousIndex; %.D!J",\/K
} /D1Lh_,2
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} O_ZYm{T[7
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抽象业务类
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java代码: \EU^`o+
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/** <5mv8'{L
* Created on 2005-7-12 w3"L5;oH
*/ `Oi#`lC\
package com.javaeye.common.business; AC'_#nPL#
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import java.io.Serializable; 1og+(m`BL
import java.util.List; G&Dl($
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import org.hibernate.Criteria; (hdu+^Qj=
import org.hibernate.HibernateException; SASLeGaV
import org.hibernate.Session; /:Gy .
import org.hibernate.criterion.DetachedCriteria; 'e' p`*
import org.hibernate.criterion.Projections; 7i{(,:
import 8!cHRtqK
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org.springframework.orm.hibernate3.HibernateCallback; 79cM_O
import oGB|k]6]|
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org.springframework.orm.hibernate3.support.HibernateDaoS <xF]ca
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import com.javaeye.common.util.PaginationSupport; .4 U*.Rf
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public abstract class AbstractManager extends <K<#)mcv
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HibernateDaoSupport { |6b~c{bt
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privateboolean cacheQueries = false; zRD-[Z/-
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privateString queryCacheRegion; b}ya9tCl;
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publicvoid setCacheQueries(boolean wBwTJCX
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cacheQueries){ R3U|{vgl
this.cacheQueries = cacheQueries; X[r0$yuE
} ZAU#^bEQB
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publicvoid setQueryCacheRegion(String TwI s_r:
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queryCacheRegion){ ^g|cRI_"
this.queryCacheRegion = -y$6gCRY
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queryCacheRegion; {QylNC9
} 5qW>#pTFVV
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publicvoid save(finalObject entity){
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getHibernateTemplate().save(entity); mICEJ\`x
} ni%)a
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publicvoid persist(finalObject entity){ 1=z[U|&R
getHibernateTemplate().save(entity); ,!@ MLn
} &Q;sbI}
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publicvoid update(finalObject entity){ 2vLun
getHibernateTemplate().update(entity); 72"H#dy%U
} Dqii60
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publicvoid delete(finalObject entity){ dH;2OWM
getHibernateTemplate().delete(entity); AQ@)'
} rvy%8%e?
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publicObject load(finalClass entity, 0V>HoH
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finalSerializable id){ r>FwJm!
return getHibernateTemplate().load ]#^v754X^T
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(entity, id); E5)0YYjHZ
} 9l&q}
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publicObject get(finalClass entity, :,aY|2si
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finalSerializable id){ !|xB>d
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return getHibernateTemplate().get QJ4$) Fr(
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(entity, id); <MkvlLu((o
} {~ F|"v
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publicList findAll(finalClass entity){ ll4CF}k
return getHibernateTemplate().find("from :R=6Ku>
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} `}#rcDK
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publicList findByNamedQuery(finalString aMhVO(+FW
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namedQuery){ .cQO?UKK
return getHibernateTemplate 2I }p X9
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().findByNamedQuery(namedQuery); <n]P D;.4
} 94ruQ/
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publicList findByNamedQuery(finalString query, ~>u|7M$(
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finalObject parameter){ ApeqbD5g&
return getHibernateTemplate IoLi7NKw
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().findByNamedQuery(query, parameter); "d$~}=a[
} ;un@E:
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publicList findByNamedQuery(finalString query, e!jy6t
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finalObject[] parameters){ [5?Dov^j3
return getHibernateTemplate MVzuE}
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().findByNamedQuery(query, parameters); 196a~xNV
} d'ZNp2L
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publicList find(finalString query){ Ph[MXb:*
return getHibernateTemplate().find ^%9oeT{
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(query); w/m@(EBK
} =eQB-Xe8Y
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publicList find(finalString query, finalObject H575W"53
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parameter){ R#4l"
return getHibernateTemplate().find 1$vG Q
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(query, parameter); 6(`N!]e*L
} M.mn9kw`
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public PaginationSupport findPageByCriteria ewk7:zS/?
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(final DetachedCriteria detachedCriteria){ .<`)`:n+B
return findPageByCriteria 5;0w({1l
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); (^}t
} ?lsK?>uU
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public PaginationSupport findPageByCriteria J#Hh4Kc
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(final DetachedCriteria detachedCriteria, finalint V)<>W_g
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startIndex){ [G|.
return findPageByCriteria ``WTg4C(Y
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(detachedCriteria, PaginationSupport.PAGESIZE, <x^$Fu
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startIndex); fAULuF
} -`k>(\Q<d
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public PaginationSupport findPageByCriteria b}R_@_<u
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(final DetachedCriteria detachedCriteria, finalint N ^rpPq
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pageSize, rV%68x9
finalint startIndex){ _Rii19k
return(PaginationSupport) OOSf<I*>
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getHibernateTemplate().execute(new HibernateCallback(){ _k2R^/9Ct%
publicObject doInHibernate dP8qP_77A~
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(Session session)throws HibernateException { ; CCg]hX
Criteria criteria = ydzsJ+dx
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detachedCriteria.getExecutableCriteria(session); ta)gOc)r
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int totalCount = {zcG%b WJ
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((Integer) criteria.setProjection(Projections.rowCount l[T-Ak
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()).uniqueResult()).intValue(); F+H]{ss>
criteria.setProjection r*`e%`HU
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(null); oWY3dc
List items = .jQx2O
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criteria.setFirstResult(startIndex).setMaxResults 'r!!W0-K
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(pageSize).list(); %" H:z
PaginationSupport ps = FFw(`[A_
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new PaginationSupport(items, totalCount, pageSize, gtuSJ+up
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startIndex); (10t,n$
return ps; nnPT08$
} b/UXO$_~-
}, true); swj\X,{
} NRx 7S9W
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public List findAllByCriteria(final }'P|A
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DetachedCriteria detachedCriteria){ t08U9`w
return(List) getHibernateTemplate MM32\}Y6
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().execute(new HibernateCallback(){ QfEJU8/5d
publicObject doInHibernate ,9ueHE
"> Qxb.Y}
(Session session)throws HibernateException { mx}5":}
Criteria criteria = h~#F2#.
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detachedCriteria.getExecutableCriteria(session); 3 ~P$p<
return criteria.list(); g&g:HH:
} .@&FJYkLYi
}, true); Wmd@%K
} _|C3\x1c
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public int getCountByCriteria(final 66?`7j X
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DetachedCriteria detachedCriteria){ HAO-|=c4
Integer count = (Integer) [s^pP2
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getHibernateTemplate().execute(new HibernateCallback(){ hFA |(l6
publicObject doInHibernate {Ycgq%1>]
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(Session session)throws HibernateException { P[ o"%NZ'
Criteria criteria = J8~hIy6]
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detachedCriteria.getExecutableCriteria(session); cY!Y?O
return \5}PF+)|
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criteria.setProjection(Projections.rowCount *I?-A(e
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()).uniqueResult(); LkJq Bg
} 85#
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}, true); \/1~5mQ+
return count.intValue(); h{mzYy}b
} H,KH}25
} rmw}Ui"
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用户在web层构造查询条件detachedCriteria,和可选的 i%133in
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 "-S!^h/v
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PaginationSupport的实例ps。 +iN!$zF5]
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ps.getItems()得到已分页好的结果集 <IR@/b!,
ps.getIndexes()得到分页索引的数组 qsp3G7\'=
ps.getTotalCount()得到总结果数 *P
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ps.getStartIndex()当前分页索引 bP$e1I3`
ps.getNextIndex()下一页索引 %GjG.11V,_
ps.getPreviousIndex()上一页索引 o
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 KD#zsL)3
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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 oa+'.b~
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一下代码重构了。 C,;<SV2#
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我把原本我的做法也提供出来供大家讨论吧: 5Zc
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首先,为了实现分页查询,我封装了一个Page类: mK M[[l&A
java代码: ;xTMOuI*
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/*Created on 2005-4-14*/ d<?Zaehe\
package org.flyware.util.page; G8F;fG N
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/** 0F!Uai1
* @author Joa fc:87ZR{K
* ;N!n06S3
*/ im>/$!&OyI
publicclass Page { `o_i+?E
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/** imply if the page has previous page */ g0~m[[
privateboolean hasPrePage; ([JFX@
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/** imply if the page has next page */ 8fvKVS
privateboolean hasNextPage; 2hntQ1[
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/** the number of every page */ ~>]Ie~E: (
privateint everyPage; ;mV>k_AG
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/** the total page number */ L) _ VdB
privateint totalPage; x6T$HN/2
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/** the number of current page */ vRmzjd~
privateint currentPage; !N:w?zsp
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/** the begin index of the records by the current ?~^p:T
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query */ K~&3etQF
privateint beginIndex; BR6HD7G
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/** The default constructor */ -K^(L#G
public Page(){ |Qpo[E}a
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} D_f:D^
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/** construct the page by everyPage ciHTnC
* @param everyPage dg N#"
* */ cw
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public Page(int everyPage){ }&ew}'*9)
this.everyPage = everyPage; qqYQ/4Ajw
} dZ,7q_r,~
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/** The whole constructor */ N:^4OnVR
public Page(boolean hasPrePage, boolean hasNextPage, C`oB [
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int everyPage, int totalPage, ='/#G0W
int currentPage, int beginIndex){ }q/[\3
this.hasPrePage = hasPrePage; 5',b~Pp
this.hasNextPage = hasNextPage; R;/LB^X]
this.everyPage = everyPage; up3mum
this.totalPage = totalPage; D1fUEHB}A8
this.currentPage = currentPage; )A;jBfr
this.beginIndex = beginIndex; o5z&sRZ
} v<} $d.&*
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/** \iwUsv>SB
* @return wzI*QXV2s
* Returns the beginIndex. xNVSWi,
*/ 2Q/V D,yU
publicint getBeginIndex(){ {>&M:_`k
return beginIndex; KC\W6|NtGj
} T6,6lll
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/** 61K:SXj
* @param beginIndex kdm@1x
* The beginIndex to set. 7sJGB^vM
*/ n{F&GE="
publicvoid setBeginIndex(int beginIndex){ ^[ >
this.beginIndex = beginIndex; 0?g&