Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 cY\-e?`=4
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 gvA&F|4
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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 dUjdQ
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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 rK=[&k
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分页支持类: kP8Ypw&
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java代码: [&+wW
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package com.javaeye.common.util; o`RTvGXk
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import java.util.List; 1/le%}mK
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publicclass PaginationSupport { NO* 1km[#
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publicfinalstaticint PAGESIZE = 30; `]tXQqD
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privateint pageSize = PAGESIZE; ?FMHK\
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privateList items; sBRw#xyS
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privateint totalCount; NaVZ)
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privateint[] indexes = newint[0]; /1MO]u\
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privateint startIndex = 0; _Dk;U*2
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public PaginationSupport(List items, int 5%4:)s{4|
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totalCount){ ?J<4IvL/
setPageSize(PAGESIZE); AV&W&$
setTotalCount(totalCount); MWhFNfS8=
setItems(items); IL>Gi`Y&
setStartIndex(0); {SROg;vA
} vn,L),"=
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public PaginationSupport(List items, int 'iL['4~.
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totalCount, int startIndex){ MR+ndB<
setPageSize(PAGESIZE); })"9TfC
setTotalCount(totalCount); }B0V$
setItems(items); vQIoj31
setStartIndex(startIndex); *5|\if\
} #Va@4<4r
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public PaginationSupport(List items, int q"]-CGAa
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totalCount, int pageSize, int startIndex){ 0c:CA>F
setPageSize(pageSize); -?e~S\JH
setTotalCount(totalCount); roRZE[ya
setItems(items); }A2@1TTPX
setStartIndex(startIndex); =|?w<qc
} ?,s{M^sj^
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publicList getItems(){ uMqo)J@s
return items; YQYN.\
} BHFWig*{
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publicvoid setItems(List items){ (mz a&WF7
this.items = items; J-I7K!B
} y4envjl0
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publicint getPageSize(){ .g4bV5ma3
return pageSize; f#^%\K:YYR
} K<|eZhp~
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publicvoid setPageSize(int pageSize){ YR[Ii?
this.pageSize = pageSize; ,L_p"A
} q+LjWZ+O
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publicint getTotalCount(){ E[_Z%zd^
return totalCount; <pPI:D@G
} GbZA3.J]yl
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publicvoid setTotalCount(int totalCount){ :l*wf/&z
if(totalCount > 0){ 9 -TFyZYU
this.totalCount = totalCount; J.O;c5wL
int count = totalCount / 7dU X(D,?
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pageSize; 8qBw;A)
if(totalCount % pageSize > 0) _;0:wXib=
count++; AY *
indexes = newint[count]; Z/ThYbk
for(int i = 0; i < count; i++){ EzthRe9
indexes = pageSize * GU"MuW`u2
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} F]YPq
}else{ VSP[G ,J.
this.totalCount = 0; 3-_4p8OK
} J/
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} Uvz9x"0[u
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publicint[] getIndexes(){ B;rq{ac!P]
return indexes; (1TYJ. Z
} ^&Qaf:M
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publicvoid setIndexes(int[] indexes){ Cf%)W:Q9
this.indexes = indexes; L(X:=)
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} s!UC{)g,
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publicint getStartIndex(){ /+66y=`UJ
return startIndex; /=-E`%R}!
} Q2k\8i
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publicvoid setStartIndex(int startIndex){ oTfEX4 t {
if(totalCount <= 0) %7L'2/Y2x
this.startIndex = 0; ~}TVM%0RTq
elseif(startIndex >= totalCount) 57r\s8
this.startIndex = indexes ?DpMR/
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[indexes.length - 1]; ok[R`99
elseif(startIndex < 0) 4#=^YuKaF1
this.startIndex = 0; c{&sf
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else{ 9$Hgh7'hvs
this.startIndex = indexes SUvHLOA
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[startIndex / pageSize]; EcP"GO5
} eQYW>z'%,
} XFM6.ye
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publicint getNextIndex(){ C0kwI*)
int nextIndex = getStartIndex() + cIq3En
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pageSize; Ak4iG2
if(nextIndex >= totalCount) tp0^%!*9
return getStartIndex(); qKWkgackP
else {zg}KiNDZd
return nextIndex; ;,9|;)U?u
} 0WYVt"|;}c
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publicint getPreviousIndex(){ NEK;'"~
int previousIndex = getStartIndex() - v|n.AGn
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pageSize; U[Z1@2zLx
if(previousIndex < 0) #<l;YT8
return0; @n})oAC,
else d)q{s(<;
return previousIndex; b}k`'++2,
} ?2.<y_1
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} ^8We}bs-c
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抽象业务类 m#8mU,7
java代码: Ak|jJ
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/** y'Wz*}8pr
* Created on 2005-7-12 ~9x$tb x-
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package com.javaeye.common.business; UG1^G07s
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import java.io.Serializable; n {^D_S
import java.util.List; ;2&(]1X
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import org.hibernate.Criteria; i)
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import org.hibernate.HibernateException; +}*]9nG
import org.hibernate.Session; 6``!DMDt/P
import org.hibernate.criterion.DetachedCriteria; NlWIb2,
import org.hibernate.criterion.Projections; @'~v~3
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org.springframework.orm.hibernate3.HibernateCallback; `ZNzDr
import N<O^%!bu R
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org.springframework.orm.hibernate3.support.HibernateDaoS Rz%+E0
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upport; Qv[@ioc
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import com.javaeye.common.util.PaginationSupport; `"/@LUso
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public abstract class AbstractManager extends / 1E6U6
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HibernateDaoSupport { $40tAes9
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privateboolean cacheQueries = false; CCQ<.iCU
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privateString queryCacheRegion; J`V7FlM
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publicvoid setCacheQueries(boolean 7e>n{rl
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cacheQueries){ D0tI
this.cacheQueries = cacheQueries; c00a;=ji
} Z*x Q"+\
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publicvoid setQueryCacheRegion(String :/d#U:I
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queryCacheRegion){ YzsHec
this.queryCacheRegion = mI9~\k&9
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queryCacheRegion; *|ubH?71%Y
} q9F(8-J
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publicvoid save(finalObject entity){ .k Gg}
getHibernateTemplate().save(entity); <.+hV4,3
} lc#su$xR>
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publicvoid persist(finalObject entity){ CGny#Vh
getHibernateTemplate().save(entity); 'I\bz;VT
} '+5*ajP<
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publicvoid update(finalObject entity){ 9xN4\y6F
getHibernateTemplate().update(entity); 1Ep!U#Del
} U''/y\Z
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publicvoid delete(finalObject entity){ 7WKb|
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getHibernateTemplate().delete(entity); _}{C?611c
} .$L'Jt2X
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publicObject load(finalClass entity, 7_ZfV? .
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finalSerializable id){ C.Y]PdYyj
return getHibernateTemplate().load kk
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(entity, id); M7BJ$fA0E
} Nz\=M|@(#
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publicObject get(finalClass entity, 9}:%CpD^~I
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finalSerializable id){ z3[
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return getHibernateTemplate().get |ILj}4ZA7
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(entity, id); i4JqU\((]
} z~UqA1r
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publicList findAll(finalClass entity){ <`+U B<K
return getHibernateTemplate().find("from /*B-y$WQk
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" + entity.getName()); [;
} oZQ%P
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publicList findByNamedQuery(finalString 2dFC{US'
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namedQuery){ ;r B2Q H]
return getHibernateTemplate GNgPf"}K
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().findByNamedQuery(namedQuery); BRi\&&<4
} 0 P3^#j
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publicList findByNamedQuery(finalString query, 4l <%Q2
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finalObject parameter){ j;WZ[g#t
return getHibernateTemplate &$:1rA_v
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().findByNamedQuery(query, parameter); I'Ui` :A
} -iLp3m<ai
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publicList findByNamedQuery(finalString query, :D\M.A
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finalObject[] parameters){ S|CN)8Jsi
return getHibernateTemplate fzT|{vG8
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().findByNamedQuery(query, parameters); K-cRNt
} lZCTthr\
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publicList find(finalString query){ ^_0zO$z,
return getHibernateTemplate().find p2cwW/^V
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(query); Y@)/iwq
} 0hVw=KDO9:
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publicList find(finalString query, finalObject Q`j!$r
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parameter){ *~YU0o
return getHibernateTemplate().find yU<T_&M
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(query, parameter); ?Imq4I~)
} !VBl/ aU@
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public PaginationSupport findPageByCriteria b*i_'k}*<g
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(final DetachedCriteria detachedCriteria){ >rJ9^rS
return findPageByCriteria l6]:Zcd0
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); qS1byqq78l
} o/??w:'
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public PaginationSupport findPageByCriteria "ld4v+o8l
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(final DetachedCriteria detachedCriteria, finalint G0*>S`:4
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startIndex){ lKKg n{R
return findPageByCriteria "jS@ug
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(detachedCriteria, PaginationSupport.PAGESIZE, }22h)){n#Y
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startIndex); ]@LeyT'cY
} }ADdKK-
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public PaginationSupport findPageByCriteria *L7&P46
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(final DetachedCriteria detachedCriteria, finalint .{r 0Szm.
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pageSize, X0G6Wp
finalint startIndex){ >8%<ML
return(PaginationSupport) CCx_|>
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getHibernateTemplate().execute(new HibernateCallback(){ Fq>tl 64A
publicObject doInHibernate 2E7vuFH4c
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(Session session)throws HibernateException { w1>uD]
Criteria criteria = X$mCn#8m
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detachedCriteria.getExecutableCriteria(session); `_"F7Czn
int totalCount = . l1uqCuB
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((Integer) criteria.setProjection(Projections.rowCount % \N52
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()).uniqueResult()).intValue(); iwM$U(
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criteria.setProjection J[ 0o6
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(null); R(.5Hs
List items = P qUjBP\
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criteria.setFirstResult(startIndex).setMaxResults T)N_ ~f|
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(pageSize).list(); =emcs%
PaginationSupport ps = ' 5tk0A
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new PaginationSupport(items, totalCount, pageSize, ^UJB%l
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startIndex); bEvlk\iql
return ps; 9pF@#A9p
} OQ*BPmS-
}, true); EjY8g@M;t
} ECW=865jL
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public List findAllByCriteria(final -/)>DOgUq
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DetachedCriteria detachedCriteria){ z:gp\
return(List) getHibernateTemplate "2m (*+
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().execute(new HibernateCallback(){ zv.R~lMtY
publicObject doInHibernate $tm%=g^
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(Session session)throws HibernateException { B:X,vE
Criteria criteria = 9I1D'7wI^^
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detachedCriteria.getExecutableCriteria(session); 3aX/)v.:4
return criteria.list(); 2wX4e0cOI4
} Xg4iH5!E
}, true); MJ.K,e
} Z(h.)$yH*=
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public int getCountByCriteria(final c;6[lv
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DetachedCriteria detachedCriteria){ /8Wfs5N
Integer count = (Integer) iY[+BI:
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getHibernateTemplate().execute(new HibernateCallback(){ 6,~Y(#
publicObject doInHibernate r `;_ #&b
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(Session session)throws HibernateException { ; <NK
Criteria criteria = Ea,L04K
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detachedCriteria.getExecutableCriteria(session); q}xYme4
return w,)O*1't
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criteria.setProjection(Projections.rowCount {VmJVO]S
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()).uniqueResult(); iVSN>APe
} *Ei(BrL/;
}, true); ]I^b&N
return count.intValue(); v?
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} BN>t"9XpW
} ASU.VY
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用户在web层构造查询条件detachedCriteria,和可选的 JYw_Z*L=m
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 FGey%:p9$
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PaginationSupport的实例ps。 Kt5k_9
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ps.getItems()得到已分页好的结果集 259R5X<V
ps.getIndexes()得到分页索引的数组 =THRyZCH
ps.getTotalCount()得到总结果数 {A`J0ol<B9
ps.getStartIndex()当前分页索引 \=&F\EV
ps.getNextIndex()下一页索引 G%F}H/|R
ps.getPreviousIndex()上一页索引 =9!|%j
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 /<VR-yr
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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 hA=}R.gi
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一下代码重构了。 )]tf|Mbu
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我把原本我的做法也提供出来供大家讨论吧: 85:KlBe%+
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首先,为了实现分页查询,我封装了一个Page类: E_D0Nm%n
java代码: 8 RA
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/*Created on 2005-4-14*/ 1| dXbyUd
package org.flyware.util.page; (B0QBDj!
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/** : "^/?Sd
* @author Joa WX*
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* |OiM(E(
*/ <Rfx`mn
publicclass Page { &~:+2
&