Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ?v
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 >]L\B w
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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 K/YXLR +
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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 9xN`
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分页支持类: 2/iBk'd
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java代码: ?NVX# t'
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package com.javaeye.common.util; O:]e4r,'
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import java.util.List; 0{OafL8&l
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publicclass PaginationSupport { oO3X>y{gN
{ v [
publicfinalstaticint PAGESIZE = 30; Al3*? H&
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privateint pageSize = PAGESIZE; HdR TdV
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privateList items; N!//m?}
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privateint totalCount; N;HG@B!m
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privateint[] indexes = newint[0]; hz+O.k],?
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privateint startIndex = 0; 1)H;}%[
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public PaginationSupport(List items, int }*P?KV (
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totalCount){ =E$B0^_2RC
setPageSize(PAGESIZE); NY
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setTotalCount(totalCount); |})v,
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setItems(items); V"|`Z}XW
setStartIndex(0); @iU(4eX
} *7w,o?l
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public PaginationSupport(List items, int kXgc'w6EhF
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totalCount, int startIndex){ w.(?O;
setPageSize(PAGESIZE); U+Vb#U7;
setTotalCount(totalCount); >|pN4FS
setItems(items); a0jzt!ci
setStartIndex(startIndex); #Ibpf ,
} Gn %"B6
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public PaginationSupport(List items, int $!vK#8-&{
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totalCount, int pageSize, int startIndex){ [VE>{4]W
setPageSize(pageSize); T<%%f.x[s
setTotalCount(totalCount); )&$mFwf
setItems(items); aM4-quaG]
setStartIndex(startIndex); [;Jq=G8&t
} z?t75#u9.
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publicList getItems(){ zGwM# -
return items; oh7tE$"c
} [ <j4w
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publicvoid setItems(List items){ P&h]uNu
this.items = items; 0}"'A[xE
} Db*&'32W
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publicint getPageSize(){ qi['~((
return pageSize; &a+=@Z)kf
} y
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publicvoid setPageSize(int pageSize){ +}
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this.pageSize = pageSize; (sSGJS'X
} E5IS<.
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publicint getTotalCount(){ 3$9V4v@2
return totalCount; 2v<O}
} )S`=y-L$
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publicvoid setTotalCount(int totalCount){ 6lL^/$]
if(totalCount > 0){ Js&.p9S2
this.totalCount = totalCount; \cdns;
int count = totalCount / T0@$6&b%\z
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pageSize; ><qA+/4]_
if(totalCount % pageSize > 0) )XDbg>
count++; |zJ2ZE|
indexes = newint[count]; B dP+>Ij
for(int i = 0; i < count; i++){ ')TS'p,n
indexes = pageSize * k#-%u,t
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} =z4J[8bb
}else{ (v&iXD5t
this.totalCount = 0; (3 Z;c_N
} 8H,k0~D
} 7b7WQ 7u
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publicint[] getIndexes(){ 7u:QT2=&
return indexes; o%OwKp
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} ~sdM~9@
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publicvoid setIndexes(int[] indexes){ Q)=2%X
this.indexes = indexes; aK8s0G!z?5
} aoBiN_
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publicint getStartIndex(){ p*U!94Pb
return startIndex; @}s EP&$
} dsg-;*%
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publicvoid setStartIndex(int startIndex){ ]_`ICS
if(totalCount <= 0) YRCOh:W*
this.startIndex = 0; RN$>!b/
elseif(startIndex >= totalCount) 6m@B.+1
this.startIndex = indexes Ed+jSO0
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[indexes.length - 1]; g""Ep
elseif(startIndex < 0) _}cD_$D
this.startIndex = 0; J06D_'{
else{ yG;@S8zC
this.startIndex = indexes i7e_~K
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[startIndex / pageSize]; 6`X}Z'4.Ox
} i v.G
} :x3xeVtY
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publicint getNextIndex(){ UjMWSPEBy
int nextIndex = getStartIndex() + ZSr!L@S
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pageSize; xUTTRJ(\
if(nextIndex >= totalCount) cdN =HM~I
return getStartIndex(); '.jYu7
else dK4w$~j{k
return nextIndex; lqmr`\@)
} 99"8d^{z
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publicint getPreviousIndex(){ `lrNH]B
int previousIndex = getStartIndex() - vOq N=bp
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pageSize; "ji+~%`^[t
if(previousIndex < 0) L#%)@
return0; Cu_-QE
else n(i/jW~0w
return previousIndex; rM?
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} v3G$9(NE;
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} bz1AmNZG
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抽象业务类 nTD4^'
java代码: 57q?:M=^
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/** 5hh6;)
* Created on 2005-7-12 yF1p^>*ak&
*/ lBa` nG
package com.javaeye.common.business; 'rq@9$h1W
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import java.io.Serializable; xdVsbW)L2
import java.util.List; [Zzztn+
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import org.hibernate.Criteria; QKhGEW~G
import org.hibernate.HibernateException; /,~g"y.;,
import org.hibernate.Session; +N'&6z0Wf
import org.hibernate.criterion.DetachedCriteria; Z:^ S-h
import org.hibernate.criterion.Projections; 2H`>Kj
import KT17I&:
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org.springframework.orm.hibernate3.HibernateCallback; Xq<_r^
import :F9Oj1lM%
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org.springframework.orm.hibernate3.support.HibernateDaoS +(W7hK4ip
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upport; jeB"j
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import com.javaeye.common.util.PaginationSupport; oS}fr?
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public abstract class AbstractManager extends abCxB^5VL
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HibernateDaoSupport { Z>l<.T"t'
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privateboolean cacheQueries = false; A~^x*#q{4
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privateString queryCacheRegion; "{trK?-8%
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publicvoid setCacheQueries(boolean ,`YIcrya:
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cacheQueries){ IM,4Si2
this.cacheQueries = cacheQueries; ?b"'w
} A-J#$B
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publicvoid setQueryCacheRegion(String Z[0/x.pp$
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queryCacheRegion){ `m#i|8
this.queryCacheRegion = m&z(2yb1
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queryCacheRegion; fJ6Q:7
} REh\WgV!u
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publicvoid save(finalObject entity){ ;*ni%|K
getHibernateTemplate().save(entity); Wyow MFp
} hztqZ:
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publicvoid persist(finalObject entity){ [_}8Vv&6
getHibernateTemplate().save(entity); Rf2mBjJ(z
} /a9CqK
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publicvoid update(finalObject entity){ }%<_>b\
getHibernateTemplate().update(entity); 9XhH*tBn7(
} M%RH4%NZ0
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publicvoid delete(finalObject entity){ _Vf>>tuW
getHibernateTemplate().delete(entity); #?,"/Btq
} 8EX?/33$
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publicObject load(finalClass entity, g_A#WQyh\'
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finalSerializable id){ e,Y<$kPV
return getHibernateTemplate().load .}uri1k"@k
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(entity, id); U0iV
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} u^#e7u
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publicObject get(finalClass entity, M*C1QQf\N
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finalSerializable id){ a.RYRq4o
return getHibernateTemplate().get &49WfctT
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(entity, id); z@V9%xF-3
} t* p%!xsH
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publicList findAll(finalClass entity){ ,oPxt
return getHibernateTemplate().find("from ledr[)
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" + entity.getName()); N R4\TU
} Aon.Y Z
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publicList findByNamedQuery(finalString -WR<tkK
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namedQuery){ 6V}xgfB
return getHibernateTemplate EJQT\c
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().findByNamedQuery(namedQuery); +_u~Np
} ^4'!B
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publicList findByNamedQuery(finalString query, "dE[X`
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finalObject parameter){ H
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return getHibernateTemplate ,A)Z.OWOq
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().findByNamedQuery(query, parameter); -YmIRocx
} jzZ]+'t
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publicList findByNamedQuery(finalString query,
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finalObject[] parameters){ ZLPj1L
return getHibernateTemplate c@)?V>oe
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().findByNamedQuery(query, parameters); }$r]\v
} N93R(x)%
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publicList find(finalString query){ TeO'E<@
return getHibernateTemplate().find kHhku!CH
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(query); I0=L_&`)
} oA7| s1
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publicList find(finalString query, finalObject Zy8tI#
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parameter){ ]VE3u_kR
return getHibernateTemplate().find o~q.j_Sa
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(query, parameter); %6m' |(-
} KrHKM 3<
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public PaginationSupport findPageByCriteria [!8bjc]c
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(final DetachedCriteria detachedCriteria){ Z glU{sU
return findPageByCriteria n:b,zssP
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); %+;l|Z{Uf
} 5,V*aP
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public PaginationSupport findPageByCriteria Y6d~hLC
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(final DetachedCriteria detachedCriteria, finalint &0 "*.:J9
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startIndex){ G ;ZN>8NB
return findPageByCriteria [McqwU/Q
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(detachedCriteria, PaginationSupport.PAGESIZE, &-JIXVd*R
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startIndex); g)D@4RM
} [z+YXs!N
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public PaginationSupport findPageByCriteria wL^x9O|`p9
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(final DetachedCriteria detachedCriteria, finalint bn5O2
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pageSize, @
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finalint startIndex){ rO O10g
return(PaginationSupport) 'zT7$ .L
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getHibernateTemplate().execute(new HibernateCallback(){ 1
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publicObject doInHibernate 8>D*U0sNl
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(Session session)throws HibernateException {
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Criteria criteria = 4^4T#f2=e
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detachedCriteria.getExecutableCriteria(session); pv&iJ7RN
int totalCount = 1/qD5 *`Y
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((Integer) criteria.setProjection(Projections.rowCount pY&dw4V
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()).uniqueResult()).intValue(); -vk/z+-^!
criteria.setProjection ,# .12Q!
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(null); jUR*
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List items = 6c/0OM#
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criteria.setFirstResult(startIndex).setMaxResults f~TkU\Rh
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(pageSize).list(); Aw4)=-LKO
PaginationSupport ps = ]n<Ba7Y
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new PaginationSupport(items, totalCount, pageSize, WX_g
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startIndex); _^zs(
return ps; \yxGE+~P
} 3webAaO
}, true); $AMcU5^b7
} Gv
}
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public List findAllByCriteria(final PU B0H
)J+rt^4|
DetachedCriteria detachedCriteria){ 7Q~W}`Qv'
return(List) getHibernateTemplate T2)CiR-b
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().execute(new HibernateCallback(){ {TMng&
publicObject doInHibernate |E||e10wR
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(Session session)throws HibernateException { B>\q!dX3
Criteria criteria = C#1'kQO
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detachedCriteria.getExecutableCriteria(session); xXmlHo<D
return criteria.list(); I69Z'}+qz
} ]gv3|W
}, true); Gi$\th,
} KZ^>_K&
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public int getCountByCriteria(final qf<o"B|_9
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DetachedCriteria detachedCriteria){ \9od*y
Integer count = (Integer) b'R]DS{8
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getHibernateTemplate().execute(new HibernateCallback(){ mL'A$BR`
publicObject doInHibernate QyZ'%T5J
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(Session session)throws HibernateException { D@[#7:rHL
Criteria criteria = -HuIz6
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detachedCriteria.getExecutableCriteria(session); ?6x&A t
return yGC
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criteria.setProjection(Projections.rowCount !,5qAGi0
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()).uniqueResult(); *H=h7ESq
} JnnxXj30,
}, true); aYHs35
return count.intValue(); SNSoV3|k-
} 00y(E@~
} VAyAXN~
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用户在web层构造查询条件detachedCriteria,和可选的 s+G(N$0U
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 (r}StR+
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PaginationSupport的实例ps。 bS55/M w
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ps.getItems()得到已分页好的结果集 fmUrwI1 %
ps.getIndexes()得到分页索引的数组 29|nt1Z
ps.getTotalCount()得到总结果数 L/vw7XNrX
ps.getStartIndex()当前分页索引 N#R8ez`
ps.getNextIndex()下一页索引 GU Mf}y
ps.getPreviousIndex()上一页索引 K!E\v4
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 uz=9L<$
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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 6ZjY-)h
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一下代码重构了。 Jiru~Vo+
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我把原本我的做法也提供出来供大家讨论吧: BI!E mA
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首先,为了实现分页查询,我封装了一个Page类: N"~P$B1X
java代码: 8/ukzY1!
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/*Created on 2005-4-14*/ pB%oFWqK
package org.flyware.util.page; ^HI2Vp
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/** e-lc2$o7{
* @author Joa />>KCmc
* |^F$Ta
*/ j*1MnP3/8Y
publicclass Page { ^ ~Tn[w W_
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/** imply if the page has previous page */ W}(T5D" 3x
privateboolean hasPrePage; j4=\MK
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/** imply if the page has next page */ x&EMg!
privateboolean hasNextPage; rO/Sj<0^
;
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/** the number of every page */ Uhyf
privateint everyPage; cN\_1
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/** the total page number */ {!.w}
privateint totalPage; ;~`/rh
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/** the number of current page */ <fMQ#No
privateint currentPage; zP c54>f
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/** the begin index of the records by the current "`Xbi/i
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query */ Ou
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privateint beginIndex; eOZ~p
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/** The default constructor */ .I^Y[_.G
public Page(){ ;2sP3!*
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} % S>6Q^B
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/** construct the page by everyPage PdRDUG{Jy
* @param everyPage rj1%IzaXU^
* */ |0_5iFAB|
public Page(int everyPage){ E?Qg'|+_
this.everyPage = everyPage; jD6T2K7i
} lf R}cx
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/** The whole constructor */ w2r*$Q
public Page(boolean hasPrePage, boolean hasNextPage, ,1vFX$
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int everyPage, int totalPage, |H5$VSw
int currentPage, int beginIndex){ Z 2$S'}F
this.hasPrePage = hasPrePage; MY(51)*
this.hasNextPage = hasNextPage; Jt?`(H
this.everyPage = everyPage; |Fq\%y#
this.totalPage = totalPage; k#p6QAhS
this.currentPage = currentPage; 'RV wxd
this.beginIndex = beginIndex; sLK$H|%>m
} *WWDwY@!u
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/** 0 r;tI"
* @return 2B_+5
* Returns the beginIndex. }me`(zp
*/ `bd9N!K
publicint getBeginIndex(){ i+I1h=
return beginIndex; MOuEsm;
} O8LIKD_I[
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/** .9<euPrz
* @param beginIndex dzV2;
* The beginIndex to set. @%^h|g8>Fu
*/ W&&C[@Jd3
publicvoid setBeginIndex(int beginIndex){ ~C?)-
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this.beginIndex = beginIndex; 4:kDBV;v
} 1ZvXRJ)%
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/** gf/<sH2}
* @return fA ),^
* Returns the currentPage. /\E3p6\*
*/ nD=N MqQ &
publicint getCurrentPage(){ =%b1EYk
return currentPage; .j"@7#tW
} u|Ng>lU
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/** pE.TG4
* @param currentPage r8o^8 .
* The currentPage to set. <anU#bEuQ
*/ ^r{N^
publicvoid setCurrentPage(int currentPage){ X%`:waR
this.currentPage = currentPage; h+9~^<oFl
} vJb/.)gh]
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/** UGoB7TEfn
* @return h6;zAM}
* Returns the everyPage. W"tGCnd
*/ J d,9<m$
publicint getEveryPage(){ shVEAT'`
return everyPage; |HwEwL+
} ?MvL}o\|
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/** !0v3Lu~j
* @param everyPage 2=naPTP(
* The everyPage to set. f{{J_""?&
*/ ]qEg5:yY
publicvoid setEveryPage(int everyPage){ Bc<