Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ^ d\SPZ
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 $D_HZ"ytu
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 "!q?P"
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 PDC]wZd/
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分页支持类: M#M?1(O/NE
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java代码: zM59UQU;
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package com.javaeye.common.util; (I=6Nnt'
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import java.util.List; aZgNPw
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publicclass PaginationSupport { y Nva1I
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publicfinalstaticint PAGESIZE = 30; ']?=[`#NL
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privateint pageSize = PAGESIZE; J
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privateList items; n\= (S9
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privateint totalCount; s*JE)
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privateint[] indexes = newint[0]; k18$JyaG
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privateint startIndex = 0; F]5\YYXO
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public PaginationSupport(List items, int D[~}uZ4\
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totalCount){ @HEPc95
setPageSize(PAGESIZE); .B$h2#i1
setTotalCount(totalCount); }m_t$aaUc1
setItems(items); UC|JAZL
setStartIndex(0); hTTfJDF
} Hsl{rN
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public PaginationSupport(List items, int Dl\d_:+
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totalCount, int startIndex){ kCp)!hVQ
setPageSize(PAGESIZE); F5IZ"Itu(
setTotalCount(totalCount); W)-hU~^OM
setItems(items); @L;C_GEa
setStartIndex(startIndex); -N z}DW>
} ^s*\Qw{Ii
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public PaginationSupport(List items, int : bv|Ah
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totalCount, int pageSize, int startIndex){ -eL'KO5'
setPageSize(pageSize); /f&By
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setTotalCount(totalCount); b *9-}g:
setItems(items); `a'`$'j
setStartIndex(startIndex); a#QByP
} %#9P?COs&W
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publicList getItems(){ o? dR\cxj
return items; #=x+
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} *w 21U!
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publicvoid setItems(List items){ +H}e)1^I
this.items = items; D3.VXuKn6
} V}:'Xgp*N
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publicint getPageSize(){ 1;`Fe":;vC
return pageSize; CJA+v-
} !a[$)c
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publicvoid setPageSize(int pageSize){ 6
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this.pageSize = pageSize; Ilef+V^qr
} p`p?li
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publicint getTotalCount(){ kaO{#i2-
return totalCount; yoW>
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} 5)*6V&
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publicvoid setTotalCount(int totalCount){ e
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if(totalCount > 0){ I61%H9;
this.totalCount = totalCount; xgs@gw7!n0
int count = totalCount / Hf_'32e3<
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pageSize; eP?~-#
if(totalCount % pageSize > 0) LYNZP4(R
count++; xFX&9^Uk
indexes = newint[count]; >KHp-|0pv
for(int i = 0; i < count; i++){ mQ=sNZ-d]
indexes = pageSize * 3W'FcE)|E
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} @Wz%KdXA
}else{ :ln/`_
this.totalCount = 0; XLocg
} %yKKUZ~
} F-tFet
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publicint[] getIndexes(){ oX*b<d{\N
return indexes; Y2D>tpqNw
} [%?hCc
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publicvoid setIndexes(int[] indexes){ GVZTDrC
this.indexes = indexes; "?[7#d])
} -U:2H7
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publicint getStartIndex(){ aPt{C3<
return startIndex; {RJ52Gx(
} sy=dY@W^
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publicvoid setStartIndex(int startIndex){ )WclV~
if(totalCount <= 0) i=V-@|Z
this.startIndex = 0; zg)|rm
elseif(startIndex >= totalCount) d^y86pq.
this.startIndex = indexes [!Ao,rt?Vg
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[indexes.length - 1]; X7b!;%3@
elseif(startIndex < 0) c`pYc
this.startIndex = 0; wE8]'o
else{ #XfT1
this.startIndex = indexes 5E0w n'
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[startIndex / pageSize]; <a fO 6?`
} ~7dF/Nn5
} oo\IS\
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publicint getNextIndex(){ f:&)"
int nextIndex = getStartIndex() + wZ
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pageSize; "5y<G:$+~
if(nextIndex >= totalCount) ,,7.=#
return getStartIndex(); }]`}Ja
else >gF-6nPQ
return nextIndex; @??u})^EL
} Z|}H^0~7S
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publicint getPreviousIndex(){ my]P_mE
int previousIndex = getStartIndex() - hj+p`e S
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pageSize; -&$%|cyThQ
if(previousIndex < 0) K` 2i
return0; 16L"^EYq
else yZ ?$8r
return previousIndex; ~RAzFLt6x
} JOPTc]
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} fG3wc
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抽象业务类 Kjv2J;Xuh
java代码: @PKAz&0
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/** z"9aAytd
* Created on 2005-7-12 r.?qEe8VV
*/ GsI[N%
package com.javaeye.common.business; . c#90RP
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import java.io.Serializable; 58 kv#;j
import java.util.List; 7(H?k
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import org.hibernate.Criteria; ,#=eu85'
import org.hibernate.HibernateException; AwtIWH*e
import org.hibernate.Session; kja4!_d
import org.hibernate.criterion.DetachedCriteria; 6V+V
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import org.hibernate.criterion.Projections; =P1RdyP
import ?U=mcdqd
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org.springframework.orm.hibernate3.HibernateCallback; MK<
import 6^WiZ^~
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org.springframework.orm.hibernate3.support.HibernateDaoS m9 ^m
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upport; jQO*oq}
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import com.javaeye.common.util.PaginationSupport; N|bPhssFw
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public abstract class AbstractManager extends "0!~g/X`rK
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HibernateDaoSupport { *sjj"^'=
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privateboolean cacheQueries = false; Z3OZPxm
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privateString queryCacheRegion; 8}Fw%;Cb
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publicvoid setCacheQueries(boolean -7&^jP\,
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cacheQueries){ -bv>iIC
this.cacheQueries = cacheQueries; Z83q-
} [c,|Lw4
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publicvoid setQueryCacheRegion(String cdd P
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queryCacheRegion){ 4x=V|"
this.queryCacheRegion = #9URVq,
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queryCacheRegion; d;;>4}XJ]
} }qG?Vmq*R[
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publicvoid save(finalObject entity){ ;D%$Eh&oma
getHibernateTemplate().save(entity); Bl>_&A)
} ho?|j"/7
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publicvoid persist(finalObject entity){ $q4 XcIX 7
getHibernateTemplate().save(entity); sURUQ H
} ykErt%k<n
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publicvoid update(finalObject entity){ ,-w-su=J_
getHibernateTemplate().update(entity); $)kk8Q4+K
} jx^|2
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publicvoid delete(finalObject entity){ ;t.SiA
getHibernateTemplate().delete(entity); L7~+x^kw
} !=8L.^5c
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publicObject load(finalClass entity, }qgqb
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finalSerializable id){ U08<V:~
return getHibernateTemplate().load wgSR*d>y*9
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(entity, id); 9,Crmbw8
} @lb=-oR!~
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publicObject get(finalClass entity, =)"NE>
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finalSerializable id){ 8GF[)z&|P:
return getHibernateTemplate().get @p9e:[
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(entity, id); rw}5nv
} ,H#qgnp
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publicList findAll(finalClass entity){ F^ %{
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return getHibernateTemplate().find("from w@gl
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" + entity.getName()); Z9;nC zHm
} qd#(`%_/
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publicList findByNamedQuery(finalString #Tgz,e9
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namedQuery){ "NXm\`8
return getHibernateTemplate Knw'h;,[
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().findByNamedQuery(namedQuery); ~P"!DaAf
} B BApL{
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publicList findByNamedQuery(finalString query, =
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finalObject parameter){ u~naVX\3b
return getHibernateTemplate 84hi, S5P
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().findByNamedQuery(query, parameter); ei|*s+OZu
} 1drqWI~
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publicList findByNamedQuery(finalString query, KL:6P-3
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finalObject[] parameters){ lD;,I^Lt6
return getHibernateTemplate C>k;Mvq O
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().findByNamedQuery(query, parameters); :#Ex3H7
} uV/HNzC
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publicList find(finalString query){ 1"4nmw}
return getHibernateTemplate().find P"~qio-
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(query); yuy+}]uB@
} **w*hd]
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publicList find(finalString query, finalObject CwEWW\Bu
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parameter){ l6}b{e
return getHibernateTemplate().find o?Tp=Ge
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(query, parameter); |/T<]+X;
} JQbMw>Y
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public PaginationSupport findPageByCriteria D"(3VIglq
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(final DetachedCriteria detachedCriteria){ die2<'\4%
return findPageByCriteria iuU3*yyn
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 2XecP'+m
} <p L;-
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public PaginationSupport findPageByCriteria ~D`oP/6
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(final DetachedCriteria detachedCriteria, finalint VATXsD
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startIndex){ N`|Ab(.
return findPageByCriteria "ZJ1`R=Mj
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(detachedCriteria, PaginationSupport.PAGESIZE, OCOO02Wq1
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startIndex); +N(YR3
} i6g[E4nk
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public PaginationSupport findPageByCriteria +{Vwz
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(final DetachedCriteria detachedCriteria, finalint a m k42
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pageSize, Dxa)7dA|
finalint startIndex){ XpAq=p0;
return(PaginationSupport) 6t mNfI34
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getHibernateTemplate().execute(new HibernateCallback(){ GT\s!D;<
publicObject doInHibernate #u2&8-Gh
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(Session session)throws HibernateException { J&U0y
Criteria criteria = /&!d
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detachedCriteria.getExecutableCriteria(session); C=_-p"O#
int totalCount = Nj@?}`C 4
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((Integer) criteria.setProjection(Projections.rowCount =|JIY
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()).uniqueResult()).intValue(); N5an9r&z(1
criteria.setProjection (7jB_ p%
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(null); GqD!W8+
List items = U!I_i*:U
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criteria.setFirstResult(startIndex).setMaxResults RW PdS
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(pageSize).list(); ,vdP
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PaginationSupport ps = s$\8)V52
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new PaginationSupport(items, totalCount, pageSize, >0+|0ba
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startIndex); u+gXBU
return ps; 6ewOZ,"j"4
} a&c#* 9t{
}, true); >]Yha}6h
} ZO0]+Ko
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public List findAllByCriteria(final z&vms
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DetachedCriteria detachedCriteria){ _NqT8C4C
return(List) getHibernateTemplate |>}0? '/]
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().execute(new HibernateCallback(){ \lakT_x
publicObject doInHibernate 898wZ{ 9
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(Session session)throws HibernateException {
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Criteria criteria = j.N\U#3KK
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detachedCriteria.getExecutableCriteria(session); l}-`E@w
return criteria.list(); yGG\[I;7
} KeHE\Fq^V
}, true); v4##(~Tu
} Yg,lJ!q
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public int getCountByCriteria(final O*/-I
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DetachedCriteria detachedCriteria){ !=:MG#p
Integer count = (Integer) k8wi-z[dV
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getHibernateTemplate().execute(new HibernateCallback(){ 14YV#o:
publicObject doInHibernate YJvT
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(Session session)throws HibernateException { f#Cdx"
Criteria criteria = <\>ak7m
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detachedCriteria.getExecutableCriteria(session); :O+b4R+
return !3Z|!JY
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criteria.setProjection(Projections.rowCount A'-YwbY
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()).uniqueResult(); zYF&Dv/u/
} )0d".Q|v4
}, true); bK;aV&
return count.intValue(); IeI%X\G
} NWwtq&pz2
} u,SZ-2K!7~
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用户在web层构造查询条件detachedCriteria,和可选的 :BxYaAVt^
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 &:f'{>3z
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PaginationSupport的实例ps。 7{F9b0zwk
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ps.getItems()得到已分页好的结果集 3CuoBb8
ps.getIndexes()得到分页索引的数组 3Il/3\
ps.getTotalCount()得到总结果数 afq
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ps.getStartIndex()当前分页索引 L(P:n-^
ps.getNextIndex()下一页索引 3v+}YT{>b
ps.getPreviousIndex()上一页索引 G6mM6(Sr
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 c;}n=7,>:L
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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 bJ!f,a'/
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一下代码重构了。 pFRnPOv
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我把原本我的做法也提供出来供大家讨论吧: ,8?*U]}
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首先,为了实现分页查询,我封装了一个Page类: Bin&:%|9?
java代码: Jn&>Z? @
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/*Created on 2005-4-14*/ z4:09!o_
package org.flyware.util.page; pvxqeC9`
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/** ?+o7Y1 k,
* @author Joa 8^i,M^f^{
* S9055`v5
*/ )X$n'E
publicclass Page { 4>`w9
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/** imply if the page has previous page */ yN%Pe:R
privateboolean hasPrePage; Q 5TyS8
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/** imply if the page has next page */ wb"t:(>&
privateboolean hasNextPage; {z
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/** the number of every page */ !&