Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 <!^
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 h+UnZfm
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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 43:t
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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 P1kB>"bR
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分页支持类: #} ,x @]p
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java代码: pJpNO$$w
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package com.javaeye.common.util; ?2J?XS>
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import java.util.List; H-t|i
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publicclass PaginationSupport { &K%aw
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publicfinalstaticint PAGESIZE = 30; P~$<X
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privateint pageSize = PAGESIZE; 'VnwG
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privateList items; L_O$>c
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privateint totalCount; fZryG
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privateint[] indexes = newint[0]; )$M,Ul
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privateint startIndex = 0; a' FN 3
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public PaginationSupport(List items, int D@54QJ<
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totalCount){ '&yg{n
setPageSize(PAGESIZE); m\0cE1fir
setTotalCount(totalCount); I*)VZW
setItems(items); wrv5V M}
setStartIndex(0); *:"^[Ckc
} >%%=0!,yX
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public PaginationSupport(List items, int Opg#*w%-
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totalCount, int startIndex){ K'b*A$5o
setPageSize(PAGESIZE); H[&@}v,L
setTotalCount(totalCount); 02b6s&L
setItems(items); pWaPC/,g
setStartIndex(startIndex); 7XAvd-
} @PkJY
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public PaginationSupport(List items, int pA4 ,@O
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totalCount, int pageSize, int startIndex){ a-0cN 9
setPageSize(pageSize); <e"J4gZf&
setTotalCount(totalCount); ?T'][q
setItems(items); wq0aF"k
setStartIndex(startIndex);
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} 'p}`i/
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publicList getItems(){ :F(9"L
return items; Yv\!vW7I
} d]B=*7]
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publicvoid setItems(List items){ W'$kZ/%[
this.items = items; qd2xb8r
} O.\h'3C
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publicint getPageSize(){ (F5ttQPh
return pageSize; o}D![/
} ,;iA2
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publicvoid setPageSize(int pageSize){ ([pSVOnIz
this.pageSize = pageSize; 1i-[+
} bx;f`8SN
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publicint getTotalCount(){ ZgYZwc&-
return totalCount; 2P}I'4C-
} ~[18q+,
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publicvoid setTotalCount(int totalCount){ uLW/f=7L
if(totalCount > 0){ .h8M
this.totalCount = totalCount; 19I:%$U3
int count = totalCount / /~hbOs/
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pageSize; g [L
if(totalCount % pageSize > 0) e- 6(F4
count++; TA;,>f*
indexes = newint[count]; xqWj|jA
for(int i = 0; i < count; i++){ j
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indexes = pageSize * \y~)jq:d"
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} bXvbddu)}
}else{ el*9 Ih
this.totalCount = 0; l2/@<0P
} OmNn,PCl8
} =J3`@9;
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publicint[] getIndexes(){ 1n3$V:00
return indexes; e^frVEV
} 6\`DlUn'*
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publicvoid setIndexes(int[] indexes){ <.$,`m,
this.indexes = indexes; uBRw>"c_*8
} "::9aYd!
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publicint getStartIndex(){ @_O3&ZK
return startIndex; PP4d?+;V
} XGk}e4;_
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publicvoid setStartIndex(int startIndex){ BhkAQEsWTQ
if(totalCount <= 0) G5umeqYC
this.startIndex = 0; )0F^NU
elseif(startIndex >= totalCount) I~k=3,7<
this.startIndex = indexes sL
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[indexes.length - 1]; i-"<[*ePd
elseif(startIndex < 0) s((b"{fFb
this.startIndex = 0; y4r2}8fi
else{ >3$uu+p1F
this.startIndex = indexes VO|u8Z"
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[startIndex / pageSize]; "i(U
} ec1Fg0Fa
} oVreP
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publicint getNextIndex(){ Crg#6k1~EN
int nextIndex = getStartIndex() + ,i;9[4QMX
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pageSize; BiE$mM
if(nextIndex >= totalCount) *Ji9%IA
return getStartIndex(); ]%||KC!O
else %cd]xQpCp
return nextIndex; *.,8,e8Vq
} P 4H*jy@?
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publicint getPreviousIndex(){ du8!3I
int previousIndex = getStartIndex() - v$Dh.y
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pageSize; VrudR#q
if(previousIndex < 0) 35}P0+
return0; |<'10
else _3I3AG0e
return previousIndex; t3K>\ :
} v(a9#bMZU
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} 01-p
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抽象业务类 #qPVQt
java代码: %odw+PhO
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/** @f-0X1C."N
* Created on 2005-7-12 #T
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*/ N4'
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package com.javaeye.common.business; p$B)^S%0i
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import java.io.Serializable; ozT._C
import java.util.List; Ni&,g
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import org.hibernate.Criteria; }`#j;H$i
import org.hibernate.HibernateException; $&bU2 ]
import org.hibernate.Session; ?exALv'B
import org.hibernate.criterion.DetachedCriteria; n(9F:N
import org.hibernate.criterion.Projections; {c.}fyN
import wHq('+{=&
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org.springframework.orm.hibernate3.HibernateCallback; AX/=}G
import }ZxW"5oq
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org.springframework.orm.hibernate3.support.HibernateDaoS =#7s+ d-
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upport; .n?5}s+q
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import com.javaeye.common.util.PaginationSupport; 7MR:X#2v>
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public abstract class AbstractManager extends dP$y>%cB
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HibernateDaoSupport { KB$ vQ@N
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privateboolean cacheQueries = false; *C,$W\6sz
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privateString queryCacheRegion; @`#OC#
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publicvoid setCacheQueries(boolean (\5<GCW-
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cacheQueries){ k
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this.cacheQueries = cacheQueries; Yqq$kln
} 18l~4"|fk
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publicvoid setQueryCacheRegion(String 2d,wrC<'$
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queryCacheRegion){ DR#3njjEC
this.queryCacheRegion = ;tZ}i4Ud
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queryCacheRegion; &@Ji+
} #)IdJ]
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publicvoid save(finalObject entity){ [C*Xk{e
getHibernateTemplate().save(entity); 74</6T]^
} ?Vb=4B{~
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publicvoid persist(finalObject entity){ dW] Ej"W
getHibernateTemplate().save(entity); mo97GW
} *
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publicvoid update(finalObject entity){ DY%T`}
getHibernateTemplate().update(entity); vwSX$OZ
} _ ;v_L
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publicvoid delete(finalObject entity){ 2n\i0?RD
getHibernateTemplate().delete(entity); oWn_3gzw;
} OmQuAG
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publicObject load(finalClass entity, YjMbd?v
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finalSerializable id){ \p_8YC
return getHibernateTemplate().load /-cX(z
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(entity, id); lqwJ F &
} ce-m)o/
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publicObject get(finalClass entity, <CdG[Ih
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finalSerializable id){ y0Q/B|&[
return getHibernateTemplate().get R&d_WB4w
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(entity, id); 7xa@wa?!L
} &Cn9
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publicList findAll(finalClass entity){ 0V>N#P]
return getHibernateTemplate().find("from 0DP%44Cv 9
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" + entity.getName()); _yXeX
} AfbA.-
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publicList findByNamedQuery(finalString 9jJ/ RX p
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namedQuery){ E;+OD&|
return getHibernateTemplate %v6]>FNP'3
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().findByNamedQuery(namedQuery); @XSu?+s)
} Z6
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publicList findByNamedQuery(finalString query, 26klW:2*
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finalObject parameter){ fgz'C?
return getHibernateTemplate '%r@D&*vp
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().findByNamedQuery(query, parameter); P+c Fp7nC
} N X#/1=
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publicList findByNamedQuery(finalString query, $5p'+bE
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finalObject[] parameters){
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return getHibernateTemplate hF%~iqd
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().findByNamedQuery(query, parameters); 3'NL1d u
} f0`rJ?us
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publicList find(finalString query){ FZI 4?YD?<
return getHibernateTemplate().find af5`ktx
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(query); kIZdND&
} ;{C{V{
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publicList find(finalString query, finalObject &!EYT0=>p
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parameter){ qc4"0Ap'
return getHibernateTemplate().find hb\Y )HSp/
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(query, parameter); .BB:7+
} SG o:FG
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public PaginationSupport findPageByCriteria wg~`Md
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(final DetachedCriteria detachedCriteria){ Y>m=cqR
return findPageByCriteria Tsp-]-)
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); h*LL(ow5
} Y,"MQFr(o
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public PaginationSupport findPageByCriteria A0k>Nb\c3
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(final DetachedCriteria detachedCriteria, finalint r/<JY5
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startIndex){ >^ar$T;Ys
return findPageByCriteria T/6=A$4
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(detachedCriteria, PaginationSupport.PAGESIZE, #E@i @'T
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startIndex); H?^#zj`Ex+
} :P1c>:j[
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public PaginationSupport findPageByCriteria ?7ZlX?D[
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(final DetachedCriteria detachedCriteria, finalint ,#O8:s
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pageSize, bD-Em#>
finalint startIndex){ f)P/@rh
return(PaginationSupport) lM%fgyX
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getHibernateTemplate().execute(new HibernateCallback(){ W
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publicObject doInHibernate 1*CWHs
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(Session session)throws HibernateException { ][1u:V/
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Criteria criteria = cN>i3}fq
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detachedCriteria.getExecutableCriteria(session); 5/ju
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int totalCount = "-:\-sMt{
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((Integer) criteria.setProjection(Projections.rowCount c/U6K
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()).uniqueResult()).intValue(); a $%[!vF
criteria.setProjection PtOnj)Q
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(null); lHqx}n@e
List items = 0z#kV}wE
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criteria.setFirstResult(startIndex).setMaxResults /vMyf),2
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(pageSize).list(); - S-1<xR
PaginationSupport ps =
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new PaginationSupport(items, totalCount, pageSize, IBh~(6
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startIndex); G'f"w5%qZv
return ps; o |iLBh$)
} %T\x~)
}, true); xv l
} v{Vesf
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public List findAllByCriteria(final qKC*jDW
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DetachedCriteria detachedCriteria){ ![^h<Om
return(List) getHibernateTemplate zmRK%a(
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().execute(new HibernateCallback(){ e`F|sz]k"H
publicObject doInHibernate ;i>E@
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(Session session)throws HibernateException { edx'p`%d5
Criteria criteria = G-
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detachedCriteria.getExecutableCriteria(session); q2vz#\A?
return criteria.list(); EQC
} k)Wz b
}, true); {m:R v&T
} a0\UL"z#+
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public int getCountByCriteria(final "@$STptkc
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DetachedCriteria detachedCriteria){ _<Yo2,1^
Integer count = (Integer) q(^J7M)
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getHibernateTemplate().execute(new HibernateCallback(){ YU(*kC8
publicObject doInHibernate e]h'
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(Session session)throws HibernateException { ^iS:mt
Criteria criteria = 3>v0W@C
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detachedCriteria.getExecutableCriteria(session); y/eX(l<{
return 8-YrmP2k
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criteria.setProjection(Projections.rowCount );H[lKy
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()).uniqueResult(); ;tiUOixJ
} P@`"MNS
}, true); ',Pk>f]AB-
return count.intValue(); (OQ
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} :/%xK"
} 1Z8oN3
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用户在web层构造查询条件detachedCriteria,和可选的 q.km>XRk~
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 X.9MOdG70
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PaginationSupport的实例ps。 6 <S&~q
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ps.getItems()得到已分页好的结果集 qFbUM;
ps.getIndexes()得到分页索引的数组 8w?\_P7QA
ps.getTotalCount()得到总结果数 E?U]w0g
ps.getStartIndex()当前分页索引 %ab)Gs
ps.getNextIndex()下一页索引 w*}yw"gP*0
ps.getPreviousIndex()上一页索引 v1g5(
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 A=]F_
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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 f.)F8!!
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一下代码重构了。 slvs oN@
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我把原本我的做法也提供出来供大家讨论吧: Ss! 3{VW
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首先,为了实现分页查询,我封装了一个Page类: ^WW|AS
java代码: ]N <]
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/*Created on 2005-4-14*/ &W<>^C2v
package org.flyware.util.page; }>X\"
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/** @))}\:
* @author Joa 'BdmFKy1
* X>Xp&o
*/ K[>@'P}y
publicclass Page { 0ij~e<
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/** imply if the page has previous page */ ) UDJ[pL@
privateboolean hasPrePage; ml33qXW:
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/** imply if the page has next page */ "i{_<;p O
privateboolean hasNextPage; M?~<w)L}
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/** the number of every page */ Jt>[]g$
privateint everyPage; jo;uR l
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/** the total page number */ Op/79]$
privateint totalPage; vMZ7uO
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/** the number of current page */ H
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privateint currentPage; &I}T<v{f
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/** the begin index of the records by the current TcKvSdr'
@ "{' j
query */ 1ntkM?
privateint beginIndex; k$-~_^4m
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/** The default constructor */ ~C"k$;(n
public Page(){ m/<F 5R
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} 5&?KW)6 Rz
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/** construct the page by everyPage x!C8?K=|
* @param everyPage ckf<N9
* */ z
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public Page(int everyPage){ hEv=T'*,K)
this.everyPage = everyPage; i+)}aA
} &}nBenYp
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/** The whole constructor */ %kK
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public Page(boolean hasPrePage, boolean hasNextPage, ws>WA{]gq
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int everyPage, int totalPage, {K45~ha9!m
int currentPage, int beginIndex){ zNV!@Yr
this.hasPrePage = hasPrePage; ePq13!FC/
this.hasNextPage = hasNextPage; \K?(
this.everyPage = everyPage; @e!Zc3
this.totalPage = totalPage; x)ddRq
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this.currentPage = currentPage; pHen>BA[
this.beginIndex = beginIndex; 1p7cv~#95
} n5Nan
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/** %@}o'=[
* @return qIbg
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* Returns the beginIndex. m]FaEQVoE
*/ pg~zUOY
publicint getBeginIndex(){ bJQ5- *F
return beginIndex; 1B)Y;hg6&
} 9VoDhsKk
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/** jWH{;V&ZV
* @param beginIndex qQfqlD<
* The beginIndex to set. q2x|%HRF
*/ I1Hw"G"&
publicvoid setBeginIndex(int beginIndex){ 1t/dxB;
this.beginIndex = beginIndex; f._l105.
} (^sh
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/** kOs(?=
* @return m#oh?@0}
* Returns the currentPage. -O|&