Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 7hcYD!DS
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 s?}e^/"v
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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 `5.'_3
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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 n0 {i&[I~+
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分页支持类: }B+C~@j
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java代码: 7(8;to6(
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package com.javaeye.common.util; t\,PB{P:J
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import java.util.List; q"J]%zO
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publicclass PaginationSupport { (Zrj_P`0[
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publicfinalstaticint PAGESIZE = 30; ,T$U'&;
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privateint pageSize = PAGESIZE; 06Sceq
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privateList items; v MH
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privateint totalCount; 7'V@+5
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privateint[] indexes = newint[0]; 6iE<T&$3P
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privateint startIndex = 0; c9u`!'g`i
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public PaginationSupport(List items, int yI
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totalCount){ Ai?*s%8v
setPageSize(PAGESIZE); k(G^z
setTotalCount(totalCount); '$(^W@M#6
setItems(items); WO>nIo5Y
setStartIndex(0); e\zm7_+i{
} u^I|T.w<r6
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public PaginationSupport(List items, int 08\,<9
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totalCount, int startIndex){ zL0pw'4
setPageSize(PAGESIZE); @:vwb\azVD
setTotalCount(totalCount); L^?qOylu
setItems(items); xdt-
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setStartIndex(startIndex); :J&oX
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} yq\K)g*=
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public PaginationSupport(List items, int j>" @,B g*
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totalCount, int pageSize, int startIndex){ D'DfJwA
setPageSize(pageSize); jLm ;ty2;
setTotalCount(totalCount); ~HsJUro
setItems(items); 2uW;
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setStartIndex(startIndex); 3;A)W18]
} K
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publicList getItems(){ vXZOy%$o
return items; 6?Ji7F
} +\
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publicvoid setItems(List items){ e6$W Qd`O
this.items = items; OA;XiR$xP
} I1M%J@ Cz
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publicint getPageSize(){ Iit;F
return pageSize; ENs&RZ;
} ( ^Nz9{
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publicvoid setPageSize(int pageSize){ `+:`_4
this.pageSize = pageSize; ]Q)OL
} =dYqS[kJW
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publicint getTotalCount(){ >_ T-u<E
return totalCount; LFRlzz;
} R$[vm6T?
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publicvoid setTotalCount(int totalCount){ w%jII{@,
if(totalCount > 0){ ; )@~
this.totalCount = totalCount; M!D3 }JRm
int count = totalCount / `7V]y-
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pageSize; ;"-&1qHN
if(totalCount % pageSize > 0) @<EO`L)Z
count++; ~dTrf>R8M
indexes = newint[count]; z5*'{t)
for(int i = 0; i < count; i++){ l}A93jSL
indexes = pageSize * M@v.c;Lt
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} FP4P|kl/9'
}else{ <$Yd0hxjU
this.totalCount = 0; lZKi'vg7
} ^>v+(
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} "b3"TPfK
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publicint[] getIndexes(){ U-tTW*[1]
return indexes; 5vnrA'BhBU
} 0*{%=M
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publicvoid setIndexes(int[] indexes){ s&3Vg7B
this.indexes = indexes; lA8`l>I
} Vp@?^imL
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publicint getStartIndex(){ J)p
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return startIndex; AFE~
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} ;vjOUn[E
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publicvoid setStartIndex(int startIndex){ )MTOU47U
if(totalCount <= 0) WOL:IZX%
this.startIndex = 0; rf{rpe$
elseif(startIndex >= totalCount) Se =`N
this.startIndex = indexes Zp=U
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[indexes.length - 1]; n,WqyNt*
elseif(startIndex < 0) 4~Q/"hMSkO
this.startIndex = 0; Qh\60f>0
else{ PB\x3pV!}
this.startIndex = indexes "@2-Zdrr1<
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[startIndex / pageSize]; _KAQ}G3
} pIqeXY
} Q*~]h;6\{d
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publicint getNextIndex(){ .eVG:tl\
int nextIndex = getStartIndex() + kMN~Y
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pageSize; k@W1-D?
if(nextIndex >= totalCount) k~w*W X'
return getStartIndex(); BLD gt~h#
else r mg}N
return nextIndex; 9q~s}='"
} P\k# >}}
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publicint getPreviousIndex(){ [ v*ju!
int previousIndex = getStartIndex() - s!$7(Q86R
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pageSize; $-sHWYZ
if(previousIndex < 0) xU`p|(SS-
return0; )\$|X}uny&
else <7jW_R@
return previousIndex; -nV9:opD
} P/_['7
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} ~Z'?LV<t
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抽象业务类 },-H"Qs
java代码: _X
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/** 1bwOmhkS
* Created on 2005-7-12 aK^q_ghh[
*/ fe_5LC"
package com.javaeye.common.business; 6.yu-xm
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import java.io.Serializable; `r 3
import java.util.List; K[zVa
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import org.hibernate.Criteria; 9_/:[N6|c|
import org.hibernate.HibernateException; ^} >w<'0
import org.hibernate.Session; am6L8N
import org.hibernate.criterion.DetachedCriteria; [ub e6
import org.hibernate.criterion.Projections; 8Z=R)asGS
import $6R-5oQ
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org.springframework.orm.hibernate3.HibernateCallback; JNnDts*w
import >Cq<@$I2EB
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org.springframework.orm.hibernate3.support.HibernateDaoS 8'y$M] e9n
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upport; #&e-|81H
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import com.javaeye.common.util.PaginationSupport; ((%?`y
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public abstract class AbstractManager extends k)TpnH! "
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HibernateDaoSupport { Xne1gms
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privateboolean cacheQueries = false; WcbiqxK7-
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privateString queryCacheRegion; }4X0epPp;:
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publicvoid setCacheQueries(boolean <qt|d&
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cacheQueries){ (A.C]hD
this.cacheQueries = cacheQueries; Pr
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} ]A_`0"m.U
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publicvoid setQueryCacheRegion(String 4E}Yt$|
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queryCacheRegion){ lPAQ3t!,
this.queryCacheRegion = _+3::j~;m
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queryCacheRegion; "Z+k=~(
} +&H4m=D-#a
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publicvoid save(finalObject entity){ kD"{g#c
getHibernateTemplate().save(entity); eS){1
} )D%~`,#pQ
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publicvoid persist(finalObject entity){ )fAUum
getHibernateTemplate().save(entity); 'dc#F3
} %J-GKpo/S
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publicvoid update(finalObject entity){ i,VMd
getHibernateTemplate().update(entity); dqcL]e
} |JsZJ9W+J
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publicvoid delete(finalObject entity){ )=(kBWM
getHibernateTemplate().delete(entity); l;E(I_
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} M )(DZ}
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publicObject load(finalClass entity,
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finalSerializable id){ cm+P]8o%{
return getHibernateTemplate().load |k9
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(entity, id); 1{.9uw"2S
} gnHbb-<i,
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publicObject get(finalClass entity, f%8C!W]Dm
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finalSerializable id){ b~cZS[S
return getHibernateTemplate().get z0Z%m@
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(entity, id); .jK4?}]
} lk =<A"^S
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publicList findAll(finalClass entity){ rSNi@;
return getHibernateTemplate().find("from :Iz8aQ
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" + entity.getName()); DW3G
} -ze J#B)C
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publicList findByNamedQuery(finalString MUwMb!Z.s
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namedQuery){ Y|/ 8up
return getHibernateTemplate 5E
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().findByNamedQuery(namedQuery); q0\6F^;M
} f<6lf7qzC
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publicList findByNamedQuery(finalString query, d0 /#nz
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finalObject parameter){ |+"(L#wk
return getHibernateTemplate -DAlRz#d,
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().findByNamedQuery(query, parameter); ]]Ufas9
} CTA3*Gn
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publicList findByNamedQuery(finalString query, ]}X
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finalObject[] parameters){ Yz93'HDB
return getHibernateTemplate 7IM@i>p%
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().findByNamedQuery(query, parameters); pmYHUj
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} 7cMv/g^h@
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publicList find(finalString query){ 3irl
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return getHibernateTemplate().find 9(<@O%YU
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(query); GsM<2@?
} l}M!8:UzU
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publicList find(finalString query, finalObject is@?VklnB
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parameter){ <ZR9GlIr
return getHibernateTemplate().find IO:G1;[/2L
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(query, parameter); %e} Saf
} cQ_Hp
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public PaginationSupport findPageByCriteria eb$#A _m
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(final DetachedCriteria detachedCriteria){ "@8li^
return findPageByCriteria zT-_5uZQ
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); a7%]Y}$
} 3"\l u?-E
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public PaginationSupport findPageByCriteria \Y}8S/]
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(final DetachedCriteria detachedCriteria, finalint &b& ,
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startIndex){ 9=2$8JN=(l
return findPageByCriteria %H"47ZFxAs
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(detachedCriteria, PaginationSupport.PAGESIZE, $ L]lHji
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startIndex); FaJ &GOM,
} .#pU=v#/[
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public PaginationSupport findPageByCriteria Owk |@6!
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(final DetachedCriteria detachedCriteria, finalint du^J2m{f
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pageSize, (Ep\Z 6*
finalint startIndex){ !g2+w$YVa
return(PaginationSupport) #Mw8^FST
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getHibernateTemplate().execute(new HibernateCallback(){ AYx{U?0p
publicObject doInHibernate 4HA<P6L
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(Session session)throws HibernateException { *;*r8[U}q
Criteria criteria = \)|hogI|f
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detachedCriteria.getExecutableCriteria(session); ekCC5P!
int totalCount = V "h
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((Integer) criteria.setProjection(Projections.rowCount CeC6hGR5
6NHX2Ja
()).uniqueResult()).intValue(); wAW5
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criteria.setProjection =C.$
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(null); [hj6N*4y
List items = w+CA1q<
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criteria.setFirstResult(startIndex).setMaxResults 3:i@II
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(pageSize).list(); 3/n5#&c\4
PaginationSupport ps = ?.;c$'
) hfpwdQ
new PaginationSupport(items, totalCount, pageSize, 6,{$J
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startIndex); G<v&4/\p`M
return ps; Q$@I"V&G.
} yaH
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}, true); TbW38\>.R
} gSQJJxZ{?
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public List findAllByCriteria(final |8tilOqI
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DetachedCriteria detachedCriteria){ N[
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return(List) getHibernateTemplate E09:E
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().execute(new HibernateCallback(){ ^3L0w}#
publicObject doInHibernate YteO6A;
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(Session session)throws HibernateException { %Y*Ndt 4
Criteria criteria = Z@PmM4F@S
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detachedCriteria.getExecutableCriteria(session); ?+}_1x`
return criteria.list(); XuM'_FN`A<
} vnZC,J `
}, true); 9m~p0 ILh
} <l E<f+
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public int getCountByCriteria(final ZRU{[4
)
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DetachedCriteria detachedCriteria){ .jjG(L
Integer count = (Integer) 6zuTQ^pz
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getHibernateTemplate().execute(new HibernateCallback(){ V{3x!+q
publicObject doInHibernate +*/Zu`kzX
#fn)k1
(Session session)throws HibernateException { A@{PZ
Criteria criteria = dE{dZ#Jfi
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detachedCriteria.getExecutableCriteria(session); =R$u[~Xl2X
return Ls+2Zbh
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criteria.setProjection(Projections.rowCount nazZ*lC
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()).uniqueResult(); Zw
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} mLLDE;7|}
}, true); 8\A#CQ5b
return count.intValue(); 84zSK)=Y
} . ~~T\rmI
} <
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用户在web层构造查询条件detachedCriteria,和可选的 ~H<6gN<j(.
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 b&N'C9/8
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PaginationSupport的实例ps。 x,pjpx
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ps.getItems()得到已分页好的结果集 3J|F?M"N7
ps.getIndexes()得到分页索引的数组 U@)eTHv}6
ps.getTotalCount()得到总结果数 z3m85F%dR
ps.getStartIndex()当前分页索引 A>;bHf@
ps.getNextIndex()下一页索引 k1Y ?
ps.getPreviousIndex()上一页索引 j[G
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 }t=!(GOb}
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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 Ru!iR#s)!
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一下代码重构了。 5o'FS{6U
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我把原本我的做法也提供出来供大家讨论吧: {14fA)`%
{{D)YldtA
首先,为了实现分页查询,我封装了一个Page类: 2M#Q.F
java代码: RSyUaA
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/*Created on 2005-4-14*/ RYQR(v
package org.flyware.util.page; tGh~!|P
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/** vkx7paY_
* @author Joa #@9/g
* ]7F=u!/`<C
*/ ~hnQUS`A
publicclass Page { y^,1a[U.
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/** imply if the page has previous page */ Bs_s&a>
privateboolean hasPrePage; ;4^Rx
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/** imply if the page has next page */ l|~A#kq
privateboolean hasNextPage; RK'\C\gMDu
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/** the number of every page */ 6ryak!|[
privateint everyPage; \FbvHr,
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/** the total page number */ *8yAG]z
privateint totalPage; <EB+1GFuI
@uqd.Q
/** the number of current page */ uGf@
privateint currentPage; HZzD VCU
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/** the begin index of the records by the current \:# L)
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query */ SO|NaqWa
privateint beginIndex; J{p1|+h%
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/** The default constructor */ BOb">6C
public Page(){ B4c]}r+
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} 8rnwXPBN
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/** construct the page by everyPage Z58X5"
* @param everyPage ^e2VE_8L
* */ ~ drS} V
public Page(int everyPage){ b@gc{R}7
this.everyPage = everyPage; *KZYv=s,u
} =V,mtT
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/** The whole constructor */ j\[dx^\=
public Page(boolean hasPrePage, boolean hasNextPage, :}L[sl\R
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int everyPage, int totalPage, 4x=v?g&
int currentPage, int beginIndex){ >\-hO&%_
this.hasPrePage = hasPrePage; >a!/QMh
this.hasNextPage = hasNextPage; m)ky*"(
this.everyPage = everyPage; Go`vfm"S
this.totalPage = totalPage; #px+;k5
this.currentPage = currentPage; lLX4Gq1
this.beginIndex = beginIndex; d\&U*=
} n$MO4s8)
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/** dc+>m,3$
* @return 2RVN\?s:
* Returns the beginIndex. O W_{$9U
*/ a5dLQxb
publicint getBeginIndex(){ CmP9Q2
return beginIndex; I13y6= d
} MD}w Y><C
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/** GL>O4S<`
* @param beginIndex :(E@Gf
* The beginIndex to set. QGMV}y
*/ NlA,'`,
publicvoid setBeginIndex(int beginIndex){ $P >
this.beginIndex = beginIndex; /7(W?xOe
} 3H'sHuK"X
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