Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 \bic.0-
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 P(epG?Qg
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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 Wk?|BR]O
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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 0>=)
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分页支持类: w3qf7{b
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java代码: !rg0U<bO!
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package com.javaeye.common.util; xzl4v=7
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import java.util.List; F/*fQAa"
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publicclass PaginationSupport { .k`*$1?73x
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publicfinalstaticint PAGESIZE = 30; `B\KS*Gya#
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privateint pageSize = PAGESIZE; =jIT"rk
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privateList items; hlFU"u_
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privateint totalCount; l5';?>!s
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privateint[] indexes = newint[0]; qM>OE8c#/
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privateint startIndex = 0; o+-Ge
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public PaginationSupport(List items, int udD*E~1q
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totalCount){ 7e4tUAiuU
setPageSize(PAGESIZE); SKSAriS~
setTotalCount(totalCount); A
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setItems(items); #/t>}lc
setStartIndex(0); 92aDHECo
} 4 uy @ {
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public PaginationSupport(List items, int i %hn
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totalCount, int startIndex){ Ot$cmBhw!
setPageSize(PAGESIZE); r(1pvcWY-
setTotalCount(totalCount); df4^C->:
setItems(items); CESe}^)n
setStartIndex(startIndex); Wytvs*\`
} t7oz9fSz=?
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public PaginationSupport(List items, int "UoCT7X
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totalCount, int pageSize, int startIndex){ O3C)N
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setPageSize(pageSize); 0Dm`Ek3A7x
setTotalCount(totalCount); !
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setItems(items); :*P___S=
setStartIndex(startIndex); oyN+pFVB:$
} ccN &h
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publicList getItems(){ NkA6Cp[Q,1
return items; [wy3Ld
} S?nNZW\6[
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publicvoid setItems(List items){ z<[.MH`ln
this.items = items; vQBY1-S
} 2>MP:yY;K
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publicint getPageSize(){
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return pageSize; +<!)k?
} @%G' U&R{
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publicvoid setPageSize(int pageSize){ |,a%z-l
this.pageSize = pageSize; LTYuxZ
} F`;TU"pDf
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publicint getTotalCount(){ _yxe2[TD
return totalCount; f`u5\!}=!
} nXM9Px!
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publicvoid setTotalCount(int totalCount){ M=\d_O#;Z
if(totalCount > 0){ (iCZz{l@~
this.totalCount = totalCount; Nn,vdu{^2
int count = totalCount / K{=r.W
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pageSize; '#McY'.D T
if(totalCount % pageSize > 0) iO?gF
count++; c+E//X|
indexes = newint[count]; SrQ4y`?
for(int i = 0; i < count; i++){ Y uw
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indexes = pageSize * 2pxWv
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} ,<;l"v(
}else{ K4?t' dd]
this.totalCount = 0; JO&;bT<
} aR="5{en{:
} {hs2?#p
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publicint[] getIndexes(){ f\x@ C)E
return indexes; S<y>Y
} I5TQ>WJbf
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publicvoid setIndexes(int[] indexes){ CzzUi]*Ac{
this.indexes = indexes; w|
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} F,L82N6\U
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publicint getStartIndex(){ ,`%k'ecN
return startIndex; 6:|!1Pg5
} <i{m.pR>
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publicvoid setStartIndex(int startIndex){ uGuc._}=
if(totalCount <= 0) Yn IM-
this.startIndex = 0; ~>N`<S
elseif(startIndex >= totalCount) mc0sdb,c$
this.startIndex = indexes 3ZW/$KP/
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[indexes.length - 1]; 12:h49AP
elseif(startIndex < 0) [0% yJH
this.startIndex = 0; NSMjr_
else{ @b::6n/u
this.startIndex = indexes :c~9>GCE&
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[startIndex / pageSize]; Zzw}sZ?8
} 5(iSOsb
} IKMsY5i
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publicint getNextIndex(){ R\9>2*w
int nextIndex = getStartIndex() + dT0^-XSY
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pageSize; aWHd}%
if(nextIndex >= totalCount) 2p$n*|T&c
return getStartIndex(); p~Yy"Ec;p
else v{mv*`~nA\
return nextIndex; EFa{O`_@U
} P|unUW(P
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publicint getPreviousIndex(){ 4cXAT9
int previousIndex = getStartIndex() - b[J-ja.
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pageSize; 8Ehy9<
if(previousIndex < 0) G?Qe"4
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return0; ]Wy^VcqX
else [ -9)T
return previousIndex; V9 +xL 1U#
} $Q`yNEc
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} E<D+)A
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抽象业务类 o
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java代码: ,X9hl J
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/** c^ixdk
* Created on 2005-7-12 QE7+rBa
*/ B8bvp:Ho|
package com.javaeye.common.business; kN'|,eKH4
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import java.io.Serializable; KcIc'G 9
import java.util.List; &GXtdO>;Zv
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import org.hibernate.Criteria; RtW4n:c
import org.hibernate.HibernateException; ]sX7%3P
import org.hibernate.Session; [WcS[](ob
import org.hibernate.criterion.DetachedCriteria; ggrI>vaw
import org.hibernate.criterion.Projections; C$KaT3I
import Z7`5x
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org.springframework.orm.hibernate3.HibernateCallback; yQu vW$
import ~ GNyE*t/Y
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org.springframework.orm.hibernate3.support.HibernateDaoS Nawp t%
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upport; ot-(4Y
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import com.javaeye.common.util.PaginationSupport; H"2 U)HJl
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public abstract class AbstractManager extends s ;48v
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HibernateDaoSupport { 929#Q#TT
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privateboolean cacheQueries = false; 'g. :MQ8
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privateString queryCacheRegion; cYsR0#
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publicvoid setCacheQueries(boolean cL6 6gOEL
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cacheQueries){ cB{%u
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this.cacheQueries = cacheQueries; 4+)Zk$E
} OMl8 a B9
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publicvoid setQueryCacheRegion(String CP}0Ri)
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queryCacheRegion){ 4"LPJX)Q
this.queryCacheRegion = X>2?
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queryCacheRegion; cvxIp#FbW
} MY&<)|v\
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publicvoid save(finalObject entity){ QDP-E[
getHibernateTemplate().save(entity); P;jlHZ 9?O
} ,Ie<'>hd
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publicvoid persist(finalObject entity){ GM:,CJ?
getHibernateTemplate().save(entity); /;+oz
} e!6eZ)l
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publicvoid update(finalObject entity){ /({P1ti:C
getHibernateTemplate().update(entity); -P2 @mx%
} .a {QA
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publicvoid delete(finalObject entity){ se!g4XEWD
getHibernateTemplate().delete(entity); /=bSt
} @ozm;
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publicObject load(finalClass entity, R3cg2H
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finalSerializable id){ hUBF/4s\
return getHibernateTemplate().load $khrWiX
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(entity, id); :u
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} 7$K}qsr<
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publicObject get(finalClass entity, %S c=_%6
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finalSerializable id){ *aI~W^N3
return getHibernateTemplate().get Jlz9E|*qV
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(entity, id); Y4`QK+~fH
} 'g2vX&=$A
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publicList findAll(finalClass entity){ RFB(d=o5S
return getHibernateTemplate().find("from &"xQ~05
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" + entity.getName()); b1H7
} !KAsvF,j
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publicList findByNamedQuery(finalString f'i6QMk\&
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namedQuery){ 'P,,<nkr|
return getHibernateTemplate *N`;I@Q"[
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().findByNamedQuery(namedQuery); !M,h79NM
} oikxg!0S
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publicList findByNamedQuery(finalString query, MJA~jjy4
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finalObject parameter){
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return getHibernateTemplate wW^Zb
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().findByNamedQuery(query, parameter); _Yy:s2I8B
} 9N^+IZ@l
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publicList findByNamedQuery(finalString query, IyOpju)?
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finalObject[] parameters){ Jl_~_Z
return getHibernateTemplate <>n9'i1
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().findByNamedQuery(query, parameters); }s(C^0x
} >IBTBh_ka
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publicList find(finalString query){ :pb67Al29
return getHibernateTemplate().find Hv8H.^D>
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(query); Hsgy'X%om
} s%^o*LQ|9
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publicList find(finalString query, finalObject qF'~F`6
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parameter){ ]Z/R!y?l"G
return getHibernateTemplate().find ]x@~-I )
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(query, parameter); d@Q][7
} JN|VPvjE
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public PaginationSupport findPageByCriteria ~$Y|ca
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(final DetachedCriteria detachedCriteria){
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return findPageByCriteria [Y$V\h=V
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); "$DldHC
} r6MB"4xd
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public PaginationSupport findPageByCriteria LN\[Tmd &
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(final DetachedCriteria detachedCriteria, finalint \lW_f{X)
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startIndex){ x W\,KSK
return findPageByCriteria ,VWGq@o%
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(detachedCriteria, PaginationSupport.PAGESIZE, Ka.Nr@Rq*~
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startIndex); &[~[~m|
} )88nMH-
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public PaginationSupport findPageByCriteria ;cLUnsB\
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(final DetachedCriteria detachedCriteria, finalint LABNj{=D!
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pageSize, #w*"qn#2Uz
finalint startIndex){ fI]b zv;
return(PaginationSupport) Pr/]0<s
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getHibernateTemplate().execute(new HibernateCallback(){ (bvoF5%
publicObject doInHibernate bE4HDq34
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(Session session)throws HibernateException { "Yby
Criteria criteria = 0m&3?"5u
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detachedCriteria.getExecutableCriteria(session); ]
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int totalCount = P#*n3&Uu
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((Integer) criteria.setProjection(Projections.rowCount U0IE1_R
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()).uniqueResult()).intValue(); $:;%bjSI
criteria.setProjection n| C|&
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(null); 2*Q3.2 Z
List items = N"1QX6
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criteria.setFirstResult(startIndex).setMaxResults K'Spbn!nC
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(pageSize).list(); ~6HDW
PaginationSupport ps = 8t[t{"
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new PaginationSupport(items, totalCount, pageSize, t3>$|}O]t
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startIndex); h[Mdr
return ps; lD3)TAW@o
} Ay%:@j(E
}, true); (}"S)#C
} QptOQ3!
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public List findAllByCriteria(final 4m /TW)
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DetachedCriteria detachedCriteria){ >[Rz
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return(List) getHibernateTemplate 2-s 7cXs
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().execute(new HibernateCallback(){ [+gzdLad
publicObject doInHibernate 0x71%=4H^x
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(Session session)throws HibernateException { VVLIeJ(*XT
Criteria criteria = -l JYr/MSL
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detachedCriteria.getExecutableCriteria(session); 1i+FL''
return criteria.list(); [Xh\mDU.
} yQwVQUW8B
}, true); Yrsp%<qj
} +6376$dC
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public int getCountByCriteria(final .[,6JU%
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DetachedCriteria detachedCriteria){ 7}o6_i
Integer count = (Integer) !sG"n&uZq
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getHibernateTemplate().execute(new HibernateCallback(){ bg1un@%!l
publicObject doInHibernate A$<>JVv
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(Session session)throws HibernateException { T3rn+BxF 7
Criteria criteria = H
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detachedCriteria.getExecutableCriteria(session); 5m`[MBt2g
return ^K.*.|
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criteria.setProjection(Projections.rowCount E*^9|Y[
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()).uniqueResult(); _uJVuCc
} "uhV|Lk*7
}, true); H!. ZH(asY
return count.intValue(); :A#+=O0\z
} (Y )!"_|
} _NT[
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用户在web层构造查询条件detachedCriteria,和可选的 V Y_f =
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 8sWr\&!
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PaginationSupport的实例ps。 9N1#V
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ps.getItems()得到已分页好的结果集 pX^=be_
ps.getIndexes()得到分页索引的数组 F"v:}Vy|
ps.getTotalCount()得到总结果数 Ph
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ps.getStartIndex()当前分页索引 /4-}k
ps.getNextIndex()下一页索引 Otxa<M+"
ps.getPreviousIndex()上一页索引 Br&^09S
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 MISE C[/
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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 kJ__:rS(T_
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一下代码重构了。 6: GN(R$0
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我把原本我的做法也提供出来供大家讨论吧: IW mHp]
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首先,为了实现分页查询,我封装了一个Page类: fRFYJFc n
java代码: j<@fT
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/*Created on 2005-4-14*/ 4/f[`].#W
package org.flyware.util.page; Z7oaQ\fR
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/** .c03}RTC^
* @author Joa Q~b_dx{m
* l:x_j\
*/ rX:1_q`xA
publicclass Page { t+J)dr
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/** imply if the page has previous page */ [m
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privateboolean hasPrePage; tbY SK
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/** imply if the page has next page */ m qpd
privateboolean hasNextPage; OK.-]()!
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/** the number of every page */ _En]@xK3&
privateint everyPage; \k4M{h6
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/** the total page number */ lR,G;
privateint totalPage; -;f+;
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/** the number of current page */ ~yd%~|
privateint currentPage; nwhm[AaNs
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/** the begin index of the records by the current I51M}b,[d
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query */ /O+e#z2f<
privateint beginIndex; o%$<LaQG5
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/** The default constructor */ O3!Ouh&
public Page(){ t&8<k+m
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} W6)dUi
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/** construct the page by everyPage DS.39NY
* @param everyPage xh=FkY&d
* */ w/hh
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public Page(int everyPage){ 2&suo!ig
this.everyPage = everyPage; {6-;P#Q0_
} fMgcK$
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/** The whole constructor */ Hf!9`R[
public Page(boolean hasPrePage, boolean hasNextPage, yY-FL`-
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int everyPage, int totalPage, cw*(L5bu
int currentPage, int beginIndex){ &n}8Uw0440
this.hasPrePage = hasPrePage; mjWp8i
this.hasNextPage = hasNextPage; *2w_oKE'+5
this.everyPage = everyPage; aOaF&6'j
this.totalPage = totalPage; #nxER
this.currentPage = currentPage; Wm];p qN
this.beginIndex = beginIndex; B:.;,@r]
} -='8_B/75
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/** D?^`(X P
* @return 4SX3c:>
* Returns the beginIndex. <=B1"'\
*/ vE^h}~5U
publicint getBeginIndex(){ AH"g^ gw~T
return beginIndex; I{i:B
} SSSDl$}'t
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/** ;'b!7sMO~
* @param beginIndex 0KWy?6 X
* The beginIndex to set. +An![1N,
*/ E.5*Jr=J
publicvoid setBeginIndex(int beginIndex){ =woqHTR
this.beginIndex = beginIndex; "jkw8UVz
} ~@)-qV^~
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/** PV Q#>_~5
* @return s>9z+;~!
* Returns the currentPage. J
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*/ ;XKo44%
publicint getCurrentPage(){ pw(U< )
return currentPage; ,=q7}5o Y
} q\z=z$VR
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/** (e bBH
* @param currentPage :yFTaniJ'.
* The currentPage to set. h0Sy']3m
*/ e&FX7dsyy
publicvoid setCurrentPage(int currentPage){ V5(tf'
this.currentPage = currentPage; .zSimEOF
} +r#=n7t
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/** [][:/~q!
* @return MK!]y8+Z
* Returns the everyPage. b;~EJ
*/ ]Gi+Z1q
publicint getEveryPage(){ 8g2-8pa{
return everyPage; ; ei<Q =[
} Ilt L@]e
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/** X'3`Q S:!
* @param everyPage `pv89aO
* The everyPage to set. 4LKs'$:A=
*/ C.9eXa1wkT
publicvoid setEveryPage(int everyPage){ LK-K_!F
this.everyPage = everyPage; :vgh
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} YCLD!S/?
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/** T$N08aju#
* @return *F%ol;|Q
* Returns the hasNextPage. }:c,SO!
*/ #K,qF*
publicboolean getHasNextPage(){ n\8[G[M
return hasNextPage; 0F0(]7g^
} 65e
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/** wor'=byh\
* @param hasNextPage 5 1CU@1Ie
* The hasNextPage to set. #3:'lGBIK
*/ p TV@nP
publicvoid setHasNextPage(boolean hasNextPage){ >-@{vyoOy
this.hasNextPage = hasNextPage; :+dWJNY:
} V]S06>P
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/** \qd)l
* @return 5P t}
* Returns the hasPrePage. d`q)^
*/ jv#" vQ9A]
publicboolean getHasPrePage(){ 5SWX v+
return hasPrePage; 4uAb
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} mX_Uhpw?t
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/** MzW$Sl&:
* @param hasPrePage 0&