Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 MB plhVK8
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 *kr/,_K
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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 Io6/Fv>!
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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 *Cy54Z#
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分页支持类: Bx\&7|,x
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java代码: 8^mE<
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package com.javaeye.common.util; F_-Lu]*
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import java.util.List; W{p}N
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publicclass PaginationSupport { 37AVk`a
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publicfinalstaticint PAGESIZE = 30; j;x()iZ<
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privateint pageSize = PAGESIZE; #h5:b`fDF
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privateList items; z^Q'GBoBA
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privateint totalCount; y@P%t9l
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privateint[] indexes = newint[0]; "W<Y1$Y=Y
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privateint startIndex = 0; P5S]h
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public PaginationSupport(List items, int Q PH=`s
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totalCount){ 3^xUN|.F*V
setPageSize(PAGESIZE); {I#_0Q,i
setTotalCount(totalCount);
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setItems(items); b UG,~\Z
setStartIndex(0); 0RR |!zEu
}
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public PaginationSupport(List items, int h$S#fY8
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totalCount, int startIndex){ Y$'j9bUJ
setPageSize(PAGESIZE); CEy\1D
setTotalCount(totalCount); f@*69a8
setItems(items); ;p`1Y<d-O
setStartIndex(startIndex); AGhenDNV
} *X5)9dq
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public PaginationSupport(List items, int 6F\ 6,E
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totalCount, int pageSize, int startIndex){ I16FVdUun4
setPageSize(pageSize); ;Iu _*U9)
setTotalCount(totalCount); Met?G0[
setItems(items); {gMe<y
setStartIndex(startIndex); k
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} 8NN+Z<
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publicList getItems(){ TG2#$Bq1
return items; {DO 9%ej)
} {QG.> lB
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publicvoid setItems(List items){ .jrNi=BP*
this.items = items; .#EU@Hc
} \S}/2]* 1
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publicint getPageSize(){ Z0gtliJ@
return pageSize; ;QI9 OcE@/
} lu=a e<M
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publicvoid setPageSize(int pageSize){ x#{!hL
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this.pageSize = pageSize; 5K vp%
} '/Aq2
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publicint getTotalCount(){ #UGSn:D<i
return totalCount; 1NYR8W]2
} NAYLlW}A
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publicvoid setTotalCount(int totalCount){ 7FX4|]
if(totalCount > 0){ Pz)lq2Zm9
this.totalCount = totalCount; h nydH-;cz
int count = totalCount / *ug~LK5Y.
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pageSize; E@VQxB7+
if(totalCount % pageSize > 0)
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count++; zJQh~)
indexes = newint[count]; xAmtm"
for(int i = 0; i < count; i++){ RpdUR*K9x
indexes = pageSize * !'f7;%7s
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} Nt>^2Mv
}else{ fit{n]g
this.totalCount = 0; EJ:O 1
} {Jn0G;
} wt($trJ
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publicint[] getIndexes(){ 4uF.kz-cg
return indexes; 8Vu@awz{L
} Okq,p=D6
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publicvoid setIndexes(int[] indexes){ ch
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this.indexes = indexes; U`v2Yw3E
} IDct!53~
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publicint getStartIndex(){ xGs}hVlZiC
return startIndex; <kB:`&X<\
} 3W1Lh~Av
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publicvoid setStartIndex(int startIndex){ Xhe& "rM
if(totalCount <= 0) *%xbn8
this.startIndex = 0; Y ^^4n$
elseif(startIndex >= totalCount) 4m*)("H
this.startIndex = indexes XkI'm\W
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[indexes.length - 1]; yan^\)HZ
elseif(startIndex < 0) \Qml~?$@lH
this.startIndex = 0; tYA@J[" ^
else{ ?Y"%BS+pt
this.startIndex = indexes 161P%sGx2
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[startIndex / pageSize]; !Asncc G
} #GM^ :rF
} D
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publicint getNextIndex(){ ^'QO!{7f
int nextIndex = getStartIndex() + U]hqRL
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pageSize; U4XW
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if(nextIndex >= totalCount) EP:`l
return getStartIndex(); Po ?MTA
else N+&uR!:.C
return nextIndex; n;Bb/Z!~
} tN#C.M7.'7
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publicint getPreviousIndex(){ xG!~TQ
int previousIndex = getStartIndex() - ^ ` LqNG
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pageSize; cSL6V2F
if(previousIndex < 0) *\ii+f-
return0; !}Xoqamm
else Snr(<u
return previousIndex; f:PlMv!{
} 8eqTA8$?
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} ElO|6kOBYG
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抽象业务类 -A#p22D,5
java代码: kcS7)"/ zC
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/** y._'o7 %
* Created on 2005-7-12 dD,}i$
*/ bi8_5I[
package com.javaeye.common.business; qU26i"GHp
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import java.io.Serializable; _[rFnyC+0V
import java.util.List; {
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import org.hibernate.Criteria; !Yof%%m$;
import org.hibernate.HibernateException; X>I3N?5
import org.hibernate.Session; U["0B8
import org.hibernate.criterion.DetachedCriteria; h$5[04.Q
import org.hibernate.criterion.Projections; U7WYS8
import y[N0P0r l:
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org.springframework.orm.hibernate3.HibernateCallback; Y` }X5(A@
import @i#JlZM_
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org.springframework.orm.hibernate3.support.HibernateDaoS @}y.
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upport; oq7G=8gTp
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import com.javaeye.common.util.PaginationSupport; <::lfPP
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public abstract class AbstractManager extends Zn9tG:V
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HibernateDaoSupport { 3ijPm<wn
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privateboolean cacheQueries = false; oC`F1!SfOO
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privateString queryCacheRegion; Sp>g77@
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publicvoid setCacheQueries(boolean n])#<0
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cacheQueries){ 2E }vuw=c
this.cacheQueries = cacheQueries; *2Pr1U
} 3sr_V~cZ9
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publicvoid setQueryCacheRegion(String 1$b@C-B@g
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queryCacheRegion){ "pkdZ
this.queryCacheRegion = a``|sn9
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queryCacheRegion; JuO47}i] 5
} ~,/@]6S&Y
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publicvoid save(finalObject entity){ :)1"yo\
getHibernateTemplate().save(entity); P<g(i 6]
} 6f +aGz
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publicvoid persist(finalObject entity){ lpG%rN!
getHibernateTemplate().save(entity); ^/BGOBK
} k6C XuU
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publicvoid update(finalObject entity){ m*m),mZ"
getHibernateTemplate().update(entity); -,bnj^L
} uw \@~ ,d
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publicvoid delete(finalObject entity){ xr'1CP
getHibernateTemplate().delete(entity); +vkmS
} Y,s EM%
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publicObject load(finalClass entity, Oc L7] b0
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finalSerializable id){ m(8Tup|
return getHibernateTemplate().load <>6j>w_|
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(entity, id); b,Wm]N
} =zFROB\
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publicObject get(finalClass entity, %)j&/QdzF&
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finalSerializable id){ CyIlv0fd}
return getHibernateTemplate().get FMdu30JV
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(entity, id); uG\~Hxqw7O
} *I 1 H
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publicList findAll(finalClass entity){ \:;MFG'
return getHibernateTemplate().find("from irQ'Rm[
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" + entity.getName()); $e+sqgU
} 7I;kh`H$(f
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publicList findByNamedQuery(finalString *$=i1w
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namedQuery){ mGE!,!s}
return getHibernateTemplate h]<S0/
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().findByNamedQuery(namedQuery); F'XQoZ* 1
} M">v4f&K1!
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publicList findByNamedQuery(finalString query, cUq]PC$|
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finalObject parameter){ -m@c{&r
return getHibernateTemplate Qxz[
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().findByNamedQuery(query, parameter); LSta]81B4L
} $!O@Z8B
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publicList findByNamedQuery(finalString query, |2do8z
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finalObject[] parameters){ $0[T<]{/?
return getHibernateTemplate 7i($/mNl
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().findByNamedQuery(query, parameters); G!j 9D
} r~,y3L6ic
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publicList find(finalString query){ _=$~l^Y[
return getHibernateTemplate().find ,1ev2T
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(query); Xmr}$<<=
} MT/jpx
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publicList find(finalString query, finalObject [S'1OR$FQ\
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parameter){ kgo#JY-4
return getHibernateTemplate().find >SXSrXyYX
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(query, parameter); _9>,9aL
} Hf('BagBL
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public PaginationSupport findPageByCriteria m]?Z_*1
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(final DetachedCriteria detachedCriteria){ btg= # u
return findPageByCriteria &%fcGNzJQ
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); <%^/uS
} QYbB\Y
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public PaginationSupport findPageByCriteria Ovt]3`U9J
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(final DetachedCriteria detachedCriteria, finalint F>\,`wP
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startIndex){ a{ST4d'T
return findPageByCriteria (}b~}X9
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(detachedCriteria, PaginationSupport.PAGESIZE, ~IZ-:?+S^
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startIndex); /<-PW9X?
} !*v%
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public PaginationSupport findPageByCriteria |!(8c>]Bo
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(final DetachedCriteria detachedCriteria, finalint d.f0OhQ
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pageSize, Z8=?Hu
finalint startIndex){ b%lB&}uw}
return(PaginationSupport) HwFg;r
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getHibernateTemplate().execute(new HibernateCallback(){ PzPNvV/o
publicObject doInHibernate 437Wy+Q|e
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(Session session)throws HibernateException { eP2Q2C8g
Criteria criteria = dSwfea_
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detachedCriteria.getExecutableCriteria(session); P8c_GEna
int totalCount = QjLU@?&
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((Integer) criteria.setProjection(Projections.rowCount 5x@ U<
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()).uniqueResult()).intValue(); "c[> >t
criteria.setProjection 4(\1z6?D
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(null); D#<y
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List items = L9/'zhiZBx
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criteria.setFirstResult(startIndex).setMaxResults k1D7=&i
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(pageSize).list(); vGyQ306
PaginationSupport ps = ])?dqgwa
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new PaginationSupport(items, totalCount, pageSize, Hs)]
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startIndex); I~l_ky|a !
return ps; S+06pj4Ie
} |6d:k~p
}, true); HJr/N)d
} 6teu_FS
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public List findAllByCriteria(final r^"o!,H9q
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DetachedCriteria detachedCriteria){ MLr L"I"
return(List) getHibernateTemplate .g/!u(iy
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().execute(new HibernateCallback(){ 9]3l'
publicObject doInHibernate r5&c!b \
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(Session session)throws HibernateException { -v9 (43
Criteria criteria = IG0_
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detachedCriteria.getExecutableCriteria(session); q[/g3D\G
return criteria.list(); _dd_Z40R
} KdR\a&[MA
}, true); %enJ[a%Qg
} ` .`:~_OE
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public int getCountByCriteria(final R{}_Qb
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DetachedCriteria detachedCriteria){ gS(JgN
Integer count = (Integer) _$*-?*V&
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getHibernateTemplate().execute(new HibernateCallback(){ Db2#QQ
publicObject doInHibernate ?Ho$fGz
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(Session session)throws HibernateException { h`fZ8|yw
Criteria criteria = "Io-%Su+
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detachedCriteria.getExecutableCriteria(session); S?t
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return vasw@Uto)
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criteria.setProjection(Projections.rowCount 'NWvQR<X
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()).uniqueResult(); =SJ[)|
} |QzJHP @
}, true); '
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return count.intValue(); h%:wIkZ/
} a:|]F|
} b c
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用户在web层构造查询条件detachedCriteria,和可选的 7TAoWD3
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 'PMzm/;8st
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PaginationSupport的实例ps。 OS"{"P
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ps.getItems()得到已分页好的结果集 Q\27\2
ps.getIndexes()得到分页索引的数组 C^/ -lc
ps.getTotalCount()得到总结果数 lbB.*oQ
ps.getStartIndex()当前分页索引 Rct"\{V')n
ps.getNextIndex()下一页索引 T1(j l)
ps.getPreviousIndex()上一页索引 &8]#RQy{f
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 my\o P(e\
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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 H~[LJ5x
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一下代码重构了。 9U|<q
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我把原本我的做法也提供出来供大家讨论吧: msc 1^2
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首先,为了实现分页查询,我封装了一个Page类: kRN|TDx(
java代码: :F7k{~
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/*Created on 2005-4-14*/ W&+y(Z-t
package org.flyware.util.page; "YG\
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/** G Sz @rDGY
* @author Joa k-WHHoU>o
* Qj
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*/ cc|CC
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publicclass Page { *.m{jgi1X
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/** imply if the page has previous page */ 6kt]`H`cfJ
privateboolean hasPrePage; \}$*}gW[}
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/** imply if the page has next page */ Y&vHOA
privateboolean hasNextPage; jDlA<1
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/** the number of every page */ y$IaXr5L
privateint everyPage; (O8,zqP9l
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/** the total page number */ 6P;o 6s
privateint totalPage; -6rf( ER
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/** the number of current page */ r=fE8[,
privateint currentPage; !uWxRpT,7
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/** the begin index of the records by the current xi680'
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query */ (jM<T;4
privateint beginIndex; 2c}B
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/** The default constructor */ XnBm`vk?V!
public Page(){ O6y @G
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} C
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/** construct the page by everyPage ?VwK2w$&={
* @param everyPage f5@.^hi[
* */ DVObrL)znL
public Page(int everyPage){ [J~aAB
this.everyPage = everyPage; z*6$&sS\>
} ZV!R#Xv
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/** The whole constructor */ sf Dg/ a
public Page(boolean hasPrePage, boolean hasNextPage, &&;ex9
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int everyPage, int totalPage, eh$G.-2N
int currentPage, int beginIndex){ B ,V(LTE
this.hasPrePage = hasPrePage; +.w[6
this.hasNextPage = hasNextPage; @. "q
this.everyPage = everyPage; gf+o1\5t@
this.totalPage = totalPage; F?7u~b|@{
this.currentPage = currentPage; Q"A_bdg5
this.beginIndex = beginIndex; Ay2b,q
} uu}'i\Q
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/** F4Rr26M
* @return );=Q] >
* Returns the beginIndex. sNL+F
*/ 4 GUA&