Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 i/)Uj-*G)
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 F5+f?B~?R?
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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 z4{|?0=C
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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 s)ZL`S?</
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分页支持类: @Cw<wrem
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java代码: zbi[r
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package com.javaeye.common.util; 8LR_K]\
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import java.util.List; a8Ci 7<V
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publicclass PaginationSupport { [gH
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publicfinalstaticint PAGESIZE = 30; g-Z>1V
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privateint pageSize = PAGESIZE; }1d
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privateList items; R2t5T-8`c
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privateint totalCount; #/5jWH7U
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privateint[] indexes = newint[0]; "'II~/9
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privateint startIndex = 0; 6^UeEmjc
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public PaginationSupport(List items, int [y=k}W}z
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totalCount){ K~v"%sG{`
setPageSize(PAGESIZE); A[=)Zw
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setTotalCount(totalCount); >9Ub=tZm
setItems(items); ~~:i+-[
setStartIndex(0); ,C(")?4aJ
} BE}lzn=sF
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public PaginationSupport(List items, int S-'iOJ1]
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totalCount, int startIndex){ &[qLl
setPageSize(PAGESIZE); q9icj
setTotalCount(totalCount); rv:,Os_
setItems(items); !Edc]rg7
setStartIndex(startIndex); :eei<cn2
} 9(ANhG
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public PaginationSupport(List items, int jD$T
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totalCount, int pageSize, int startIndex){ u|O5ZV-cd
setPageSize(pageSize); 1th|n
setTotalCount(totalCount); jJ|u!a
setItems(items); |UBR8
setStartIndex(startIndex); |giK]Z
} s26:(J
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publicList getItems(){ h^?[:XBeav
return items; D3(|bSca
} ) dwPD
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publicvoid setItems(List items){ 6hAeLlU1
this.items = items; 8O("o7~"
} jO<K0cc
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publicint getPageSize(){ $zyY"yWRZ
return pageSize; "xdXHuX
} s|%mGt &L
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publicvoid setPageSize(int pageSize){ K?(ls$
this.pageSize = pageSize; ]^/:Xsk$
} (#X/sZQh
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publicint getTotalCount(){ #B;` T[
return totalCount; OZQhT)nS]
} dB^J}_wp
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publicvoid setTotalCount(int totalCount){ 9%>H}7=
if(totalCount > 0){ +, p
this.totalCount = totalCount; ce1KUwo]
int count = totalCount / 1sGkbfh{t
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pageSize; ofj7$se
if(totalCount % pageSize > 0) ,BOB &u
count++; CNM/}|N^Si
indexes = newint[count]; r/Qq-1E
for(int i = 0; i < count; i++){ #xm<|s
indexes = pageSize * "|.>pD#0&
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} zPH1{|H+l
}else{ J<>z}L{
this.totalCount = 0; `m`jX|`
} rm1R^n
} eP(%+[g
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publicint[] getIndexes(){ L7wl3zG
return indexes; MDGcK/$')f
} zTAt% w5
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publicvoid setIndexes(int[] indexes){ G0^23j
this.indexes = indexes; {ylc2 1
} D7 [n^WtL
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publicint getStartIndex(){ 4ME8NEE
return startIndex; X>wB=z5PXK
} -]+XTsL
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publicvoid setStartIndex(int startIndex){ .gG<08Z
if(totalCount <= 0) 7$8z}2
this.startIndex = 0; T9*\ITA
elseif(startIndex >= totalCount) |pqLwnOu
this.startIndex = indexes 9hmCvQgtf
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[indexes.length - 1]; #fk)Y1
elseif(startIndex < 0) cx_[Y
this.startIndex = 0; 5w@ ;B
else{ QKwWX_3%Z]
this.startIndex = indexes one^XYy1%
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[startIndex / pageSize]; f"k?Ix\
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} t TA6 p
} l(v$+
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publicint getNextIndex(){ h$f/NSct2
int nextIndex = getStartIndex() + e%R+IH5i
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pageSize; &M6)-V4
if(nextIndex >= totalCount) 2 8f-8B
return getStartIndex(); Xd)ba9{
else p87s99
return nextIndex; Wey-nsk
} q&<#)#+
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publicint getPreviousIndex(){ j+Y4>fL$
int previousIndex = getStartIndex() - w_KGn17
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pageSize; ~H@':Mms.h
if(previousIndex < 0) Rb#Z'1D'G
return0; yx{Ac|<mR
else JV36@DVQ
return previousIndex; \$?[>=<wB
} at,Xad\j
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} qt^%jIv
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抽象业务类 g_0"T}09(
java代码: {)4Vv`n
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/** O3bK>9<K
* Created on 2005-7-12 oxO}m7ULH
*/ Xuh_bW&zF
package com.javaeye.common.business; ?=r!b{9
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import java.io.Serializable; ;jX_e(T3m
import java.util.List; M? [lpH3
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import org.hibernate.Criteria; q hK;#<#
import org.hibernate.HibernateException; "MoV*U2s,
import org.hibernate.Session; Y1`.
import org.hibernate.criterion.DetachedCriteria; ^ /
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import org.hibernate.criterion.Projections; U?$v1 ||
import ei\X/Z*q%P
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org.springframework.orm.hibernate3.HibernateCallback; 2i,Jnv=sR
import wTIf#y1=9
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org.springframework.orm.hibernate3.support.HibernateDaoS OR?8F5o?p
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upport; ]"/ *7NM
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import com.javaeye.common.util.PaginationSupport; yt!K|g
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public abstract class AbstractManager extends f{3FoN=z
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HibernateDaoSupport { @Cz1rKU^l
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privateboolean cacheQueries = false; 5)T{iPU%X
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privateString queryCacheRegion; e}K;5o=I
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publicvoid setCacheQueries(boolean !%Z1"FDm/
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cacheQueries){ A)`M*(~
this.cacheQueries = cacheQueries; 9 z3Iwl
} jWU)y)$
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publicvoid setQueryCacheRegion(String 8\I(a]kM`
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queryCacheRegion){ X(WG:FP27
this.queryCacheRegion = IL>g-
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queryCacheRegion; niA{L:4
} G 8NSBaZe
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publicvoid save(finalObject entity){ 97Q!Rot
getHibernateTemplate().save(entity); {?m',sG;&
} ~+T~}S
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publicvoid persist(finalObject entity){ 4p1{Ady
getHibernateTemplate().save(entity); F'*{Fk
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} E3gQ`+wNg?
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publicvoid update(finalObject entity){ A$5!]+
getHibernateTemplate().update(entity); DAvAozM
} T
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publicvoid delete(finalObject entity){ M~"K@g=Wr
getHibernateTemplate().delete(entity); (JF\%Yj/
} _C*}14
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publicObject load(finalClass entity, |bBYJ
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finalSerializable id){ /Wj9Stj5
return getHibernateTemplate().load sXfx[)T<
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(entity, id); =nY*,Xu<
} "C0oFRk
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publicObject get(finalClass entity, M&>Z[o
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finalSerializable id){ UCq+F96j
return getHibernateTemplate().get QzV:^!0J
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(entity, id); \
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} Tlf G"HzZ%
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publicList findAll(finalClass entity){ gGZ$}vX
return getHibernateTemplate().find("from GbMSO
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" + entity.getName()); YxsWY7J
} g@S"!9[;U
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publicList findByNamedQuery(finalString ci*Z9&eS+
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namedQuery){ >Ks| yNJ
return getHibernateTemplate #|gt(p]C
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().findByNamedQuery(namedQuery); D+k5e=
} scA&:y
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publicList findByNamedQuery(finalString query, <)"Mi}Q[)p
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finalObject parameter){ v'DL >Y
return getHibernateTemplate 8Y&(o-R0
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().findByNamedQuery(query, parameter); NB>fr#pb
} )TP7gLv=b
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publicList findByNamedQuery(finalString query, a|66[
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finalObject[] parameters){ :PjHs Np;^
return getHibernateTemplate *%Q!22?6F
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().findByNamedQuery(query, parameters); 2AU_<Hr6
} ^S[Mg6J
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publicList find(finalString query){ r0hu?3u1?
return getHibernateTemplate().find xy[R9_V
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(query); 4egq Y0A
} &
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publicList find(finalString query, finalObject $0{c=r9
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parameter){ L%N|8P[
return getHibernateTemplate().find \/'u(|G
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(query, parameter); VBsS1!g
} {6A3?q
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public PaginationSupport findPageByCriteria :3u>%
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(final DetachedCriteria detachedCriteria){ #=+d;RdlW
return findPageByCriteria H}X3nl\]
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); q]<cn2
} gNN{WFHQX:
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public PaginationSupport findPageByCriteria aQw?r
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(final DetachedCriteria detachedCriteria, finalint A=E1S{C
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startIndex){ Qnph?t>
return findPageByCriteria [,$] %|6wt
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(detachedCriteria, PaginationSupport.PAGESIZE, kW5g]Q
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startIndex); Ll%[}C?~]?
} 0I& !a$:
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public PaginationSupport findPageByCriteria !{"{(h)+@
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(final DetachedCriteria detachedCriteria, finalint h0d;a
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pageSize, KR%DpQ&{'
finalint startIndex){ @'s^
return(PaginationSupport) -AJe\ J 2
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getHibernateTemplate().execute(new HibernateCallback(){ j8L!miv6
publicObject doInHibernate -T`rk~A9A
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(Session session)throws HibernateException { pjWqI6,
Criteria criteria = {Jwh .bJ
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detachedCriteria.getExecutableCriteria(session); f9F@G&&Ugg
int totalCount = [C9 ->`(`
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((Integer) criteria.setProjection(Projections.rowCount 'eZUNX
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()).uniqueResult()).intValue(); nB WVG
criteria.setProjection p,Qr9p3y
ab: yH ')
(null); 2D>WIOX
List items = 5iwJdm
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criteria.setFirstResult(startIndex).setMaxResults g%Sl+gWdJ
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(pageSize).list(); D:/^TEib
PaginationSupport ps = I|@%|sTW
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new PaginationSupport(items, totalCount, pageSize, 8lg$]
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startIndex); @GK0j"_
return ps; /Z94<}C6b
} nGZZCsf <
}, true); %l(qyH)*
} [?Wt ZM^q
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public List findAllByCriteria(final Xk8+m>
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DetachedCriteria detachedCriteria){ mw-0n
return(List) getHibernateTemplate `<cB 6
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().execute(new HibernateCallback(){ q]ER_]%Gna
publicObject doInHibernate 2Xys;Dwx
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(Session session)throws HibernateException { ^y]CHr
Criteria criteria = o['HiX
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detachedCriteria.getExecutableCriteria(session); ^OnU;8IC
return criteria.list(); \!Cix}}1
} Gt3V}"B3\
}, true); DpI)qg#>V
} n*D-01vYP
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public int getCountByCriteria(final iC10|0%{
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DetachedCriteria detachedCriteria){ 4Z12Z@ A#7
Integer count = (Integer) M_<O'Ii3
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getHibernateTemplate().execute(new HibernateCallback(){ ,]+P#eXgE
publicObject doInHibernate dbQUW#<Q
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(Session session)throws HibernateException { $!)Sgb
Criteria criteria = /7/d
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detachedCriteria.getExecutableCriteria(session); 3(0k!o0"
return .'k]]2%ILp
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criteria.setProjection(Projections.rowCount @KfFtR-;
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()).uniqueResult(); a|Io)Qhr
} eKPxSN Z
}, true); z-$ bce9*
return count.intValue(); j6]+fo&3
} +P:xB0Tm
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} ?-1r$z
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用户在web层构造查询条件detachedCriteria,和可选的 , 7&`V=C
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ACm9H9:Vd
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PaginationSupport的实例ps。 1RpTI7
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ps.getItems()得到已分页好的结果集 F67%xz0
ps.getIndexes()得到分页索引的数组 $<cio
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ps.getTotalCount()得到总结果数 G5a PjP
ps.getStartIndex()当前分页索引 ^}7iouE C
ps.getNextIndex()下一页索引 5#3/
ps.getPreviousIndex()上一页索引 ARvT
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 _ZX"gHx
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 &~gqEl6RF
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一下代码重构了。 k`FCyO
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我把原本我的做法也提供出来供大家讨论吧: 5mxHOtvtWM
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首先,为了实现分页查询,我封装了一个Page类: IA_>x9 (~
java代码: 6$c,#%Jt*
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/*Created on 2005-4-14*/ |TM&:4D]^
package org.flyware.util.page; '?7th>pC
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/** x dDR/KS
* @author Joa >fHg1d2-
* &Uq++f6
*/ o_;pEe
publicclass Page { J%}9"Q5
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/** imply if the page has previous page */ q ,6 y{RyS
privateboolean hasPrePage; 5(e?,B }
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/** imply if the page has next page */ 2c:H0O
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privateboolean hasNextPage; Dlz||==
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/** the number of every page */ 'D#iT}Vu
privateint everyPage; eLE9-K+
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