Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 :7'0:'0$t
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 r.W"@vc>
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 ~>wq;T:=
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。
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分页支持类: Y7IlqC`i
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java代码:
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package com.javaeye.common.util; vzT6G/
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import java.util.List; WLA_YMlA
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publicclass PaginationSupport { K<fq=:I3
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publicfinalstaticint PAGESIZE = 30; N'W>pU
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privateint pageSize = PAGESIZE; 9dhFQWz"
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privateList items; [zO(V`S2
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privateint totalCount; ^SelqX
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privateint[] indexes = newint[0]; Y$DgL
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privateint startIndex = 0; ?f%DVK d
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public PaginationSupport(List items, int E`LIENm
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totalCount){ #._6lESK
setPageSize(PAGESIZE); nCmrt*&}
setTotalCount(totalCount); KARQKFp!C>
setItems(items); 5v03<m0`y
setStartIndex(0); X2mm'JDwK
} jMN@x]6w
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public PaginationSupport(List items, int 7m)ykq:?
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totalCount, int startIndex){ 2nz'/G
setPageSize(PAGESIZE); o\Vt $
setTotalCount(totalCount); G"R>a w
setItems(items); KPvYq?F>4
setStartIndex(startIndex); pzp"NKxi
} 1$!K2=%OXj
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public PaginationSupport(List items, int YedipYG9;
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totalCount, int pageSize, int startIndex){ !ES#::;z?
setPageSize(pageSize); LR?#H)$
setTotalCount(totalCount); vnOF$6n
setItems(items); rMFf8D(Y
setStartIndex(startIndex); (N>ew)Ke
} CX2q7azG
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publicList getItems(){ g?Ty5~:lq
return items; n\NDi22
} xa axj
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publicvoid setItems(List items){ [ESQD5&
this.items = items; o sH,(\4_
}
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publicint getPageSize(){ JA2}
return pageSize; ^bw~$*"j#
}
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publicvoid setPageSize(int pageSize){ ^ x#RUv
this.pageSize = pageSize; KTREOOu .t
} S~9kp?kR$
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publicint getTotalCount(){ G+yz8@
return totalCount; ~_\2\6%1^n
} @Bwl)G!|
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publicvoid setTotalCount(int totalCount){ <%5uzlp
if(totalCount > 0){ 545xs`Q_
this.totalCount = totalCount; ~}l,H:jk@
int count = totalCount / G#M]\)f%
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pageSize; @"5u~o')@v
if(totalCount % pageSize > 0) ^IZ0M1&W;
count++; AR2+W^aM3
indexes = newint[count]; cLF>Jvs*J
for(int i = 0; i < count; i++){ J(*"S!q)6
indexes = pageSize * jpS#'h
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} gVWLY;c 3}
}else{ QVhBHAw
this.totalCount = 0; c>k6i?u:X7
} L(rjjkH
} |n%N'-el
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publicint[] getIndexes(){ PQ|x?98
return indexes; :G)x+0u
} 4s2ex{$+MA
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publicvoid setIndexes(int[] indexes){ aB_z4dqwU
this.indexes = indexes; O&%T_Zk@@
} ~hX'FV
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publicint getStartIndex(){ FkkB#Jk4
return startIndex; 0`=?ig_
} $~\qoW<
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publicvoid setStartIndex(int startIndex){ >FhBl\oIi
if(totalCount <= 0) X;g|-<
this.startIndex = 0; v2g+oKO]
elseif(startIndex >= totalCount) tr+~@]I+
this.startIndex = indexes ~+ur*3X
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[indexes.length - 1]; sP8B?Tn1W
elseif(startIndex < 0) ^ 9E(8DD
this.startIndex = 0; !(o2K!v0
else{ D/>5\da+y
this.startIndex = indexes a-=apD1RvG
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[startIndex / pageSize]; 9)X<}*(qo
} 4\RuJx
} )QT+;P.
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publicint getNextIndex(){ 6U]7V
int nextIndex = getStartIndex() + 6<6_W#
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pageSize; Grv|Wuli
if(nextIndex >= totalCount) m#p^'}]!;
return getStartIndex(); <GEn9;\
else ^5F/=TtE G
return nextIndex; aT[7L9Cw
} &GAx*.L
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publicint getPreviousIndex(){ :r=_\?
int previousIndex = getStartIndex() - vA `.8U 0S
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pageSize; {5`?0+
if(previousIndex < 0) 6Rj
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return0; RPQ)0.O7
else X'<xw
return previousIndex; ,)G,[ih
} Ckp=d
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} p
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抽象业务类 +V^_ksi\
java代码: f
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/** wr(?L7
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* Created on 2005-7-12 ~sD'pS
*/ /jAs`"U
package com.javaeye.common.business; T~Cd=s(T"
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import java.io.Serializable; WDq3K/7\
import java.util.List; -M}iDBJx>#
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import org.hibernate.Criteria; 25r=Xv
import org.hibernate.HibernateException; TPuzL(ws
import org.hibernate.Session; C'#:}]@E
import org.hibernate.criterion.DetachedCriteria; kLP^q+$u)!
import org.hibernate.criterion.Projections; sBMHf9u
import ej `$-hBBV
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org.springframework.orm.hibernate3.HibernateCallback; &XP 0
import kCV OeXv
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org.springframework.orm.hibernate3.support.HibernateDaoS 8*X8U:.0o
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upport; q!4dK4`#5
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import com.javaeye.common.util.PaginationSupport; E;N8{Ye_
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public abstract class AbstractManager extends <Coh
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HibernateDaoSupport { /VQ<}S[k}-
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privateboolean cacheQueries = false;
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privateString queryCacheRegion; vjb{h'v
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publicvoid setCacheQueries(boolean jsj" W&J
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cacheQueries){ Ue7~rPdlR
this.cacheQueries = cacheQueries; '4iu0ie>D
} Jx]`!dP3
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publicvoid setQueryCacheRegion(String i \~4W$4I
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queryCacheRegion){ (DU{o\=
this.queryCacheRegion = Tym!7H2
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queryCacheRegion; w[iQndu
} WG,{:|!E
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publicvoid save(finalObject entity){ /dAIg1ra
getHibernateTemplate().save(entity); YL]x>7T~4t
} 1<*-,f
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publicvoid persist(finalObject entity){ Q_Rr5/
getHibernateTemplate().save(entity); Oo E@30+
} eL.S="
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publicvoid update(finalObject entity){ t0Uax-E(
getHibernateTemplate().update(entity); Q["}U7j
} pVr,WTr6E
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publicvoid delete(finalObject entity){ :Vg,[\I{
getHibernateTemplate().delete(entity); +J2=\YO
} I?=Q
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publicObject load(finalClass entity, }.#C9<"}
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finalSerializable id){ QL3%L8
return getHibernateTemplate().load #/aWGx_
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(entity, id); ^U52
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} S}>rsg!
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publicObject get(finalClass entity, 7Y-GbG.'
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finalSerializable id){ g$ h!:wW
return getHibernateTemplate().get J;qH w[6
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(entity, id); MDRSI g
} z~F!zigNAc
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publicList findAll(finalClass entity){ bAgKOfT
return getHibernateTemplate().find("from _M?:N:e
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" + entity.getName()); [bAv|;
} m2_B(-
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publicList findByNamedQuery(finalString *@yYqI<1a
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namedQuery){ {w2<;YXj!
return getHibernateTemplate F](kU#3"S
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().findByNamedQuery(namedQuery); yY!jkRq%w
} 6d_l[N
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publicList findByNamedQuery(finalString query, `.n[G~*w~1
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finalObject parameter){ ]LD@I;(_
return getHibernateTemplate RAe:$Iv$!v
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().findByNamedQuery(query, parameter); X{)M}WO+r
} ydpsPU?wj5
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publicList findByNamedQuery(finalString query, [;c#LJ/y
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finalObject[] parameters){ vJYy` k^Y
return getHibernateTemplate _c[t.\-`]
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().findByNamedQuery(query, parameters); c|E
} k1X <jC]P
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publicList find(finalString query){ A w83@U
return getHibernateTemplate().find L|v1=qNH4
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(query); xX}vxhN
} z*:^*,
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publicList find(finalString query, finalObject }lhJt|q c
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parameter){ BH=vI<D
return getHibernateTemplate().find eI- ~ +.
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(query, parameter); <#:"vnm$j
} Y1+f(Q
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public PaginationSupport findPageByCriteria __)9JF
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(final DetachedCriteria detachedCriteria){ 4%B${zP(.}
return findPageByCriteria #[IQmU23
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ?!Y2fK=h0
} N~SG=\rP;o
# *\PU
public PaginationSupport findPageByCriteria dq[CT
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(final DetachedCriteria detachedCriteria, finalint Fe:0nr9;
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startIndex){ \ ddbqg?`
return findPageByCriteria *&LVn)@[`
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(detachedCriteria, PaginationSupport.PAGESIZE, (ZDRjBth[
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startIndex); e%"L79Of6)
} ceAK;v
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public PaginationSupport findPageByCriteria d!!5'/tmS
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(final DetachedCriteria detachedCriteria, finalint %T!UEl`v
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pageSize, "{|9Yis=
finalint startIndex){ +.{_n(kU
return(PaginationSupport) C%l~qf1n
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getHibernateTemplate().execute(new HibernateCallback(){ }*;Hhbox
publicObject doInHibernate H+F'K
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(Session session)throws HibernateException { s(F^P
Criteria criteria = a(!:a+9WOP
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detachedCriteria.getExecutableCriteria(session); amOBUD5Ld`
int totalCount = SI U"cO4
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((Integer) criteria.setProjection(Projections.rowCount (Zx;GS
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()).uniqueResult()).intValue(); R:zjEhH)
criteria.setProjection 8z\WyDz
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(null); q
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List items = ,Epg&)wC]
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criteria.setFirstResult(startIndex).setMaxResults "@DCQ
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(pageSize).list(); Sw>AgES
PaginationSupport ps = 3%>"|Ye}A
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new PaginationSupport(items, totalCount, pageSize, }fUV*U:3
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startIndex); TAIcp*)ZM
return ps; IYb@@Jzo
} xqX~nV#TB
}, true); }>fL{};Z"
} 4,
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public List findAllByCriteria(final &$|k<{j[<f
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DetachedCriteria detachedCriteria){ ZI-)'
return(List) getHibernateTemplate JuKj
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().execute(new HibernateCallback(){ P*Uu)mG)G
publicObject doInHibernate |&o%c/
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(Session session)throws HibernateException { mq do@
Criteria criteria = tNoo3&
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detachedCriteria.getExecutableCriteria(session); =&< s*-l[
return criteria.list();
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} \@3i=!
}, true); +kmPQdO;*/
} x/R|i%u-s
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public int getCountByCriteria(final {eMu"<
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DetachedCriteria detachedCriteria){ 9co1+y=i{
Integer count = (Integer) k5P&F
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getHibernateTemplate().execute(new HibernateCallback(){ X2/`EN\
publicObject doInHibernate s+$l.aIO!
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(Session session)throws HibernateException { fOF02WP^
Criteria criteria = 1Hp0,R}
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detachedCriteria.getExecutableCriteria(session); A !x"*
return ym{?vY
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criteria.setProjection(Projections.rowCount m&EwX ^1-
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()).uniqueResult(); Z
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} Da0E)
}, true); ej]^VS7w[r
return count.intValue(); !Z`~=n3bk
} 8yF15['
} .TSj8,
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用户在web层构造查询条件detachedCriteria,和可选的 GTyS8`5E*
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 >t20GmmN
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PaginationSupport的实例ps。 "W?k~.uw
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ps.getItems()得到已分页好的结果集 k:nr!Y<
ps.getIndexes()得到分页索引的数组 D: NBb!
ps.getTotalCount()得到总结果数 MLG%+@\
ps.getStartIndex()当前分页索引 "[q/2vC
ps.getNextIndex()下一页索引 FAz shR
ps.getPreviousIndex()上一页索引 k9vr6We'
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Ks(+['*S
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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 pLE|#58I
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一下代码重构了。 NIY0f@1z-
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我把原本我的做法也提供出来供大家讨论吧: MS)# S&
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首先,为了实现分页查询,我封装了一个Page类: q&B'peT
java代码: Xw(e@:
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/*Created on 2005-4-14*/ cZuZfMDM
package org.flyware.util.page; 4_ztIrw
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/** mnzamp
* @author Joa O[+S/6uy
* :bkACuaEn
*/ FVW<F(g`
publicclass Page { Og4 X3QG
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/** imply if the page has previous page */ AU)"L_
i}
privateboolean hasPrePage; ~}q"M[{
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/** imply if the page has next page */ E ~<SEA
privateboolean hasNextPage;
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/** the number of every page */ ,B(UkPGT
privateint everyPage; /J]Yj,
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/** the total page number */ *]nha1!S
privateint totalPage; 7L|w~l7R~
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/** the number of current page */ ,%w_E[2
privateint currentPage; UTGR{>=>
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/** the begin index of the records by the current 8 k9(iS
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query */ qL091P\F
privateint beginIndex; {+r
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/** The default constructor */ yH#zyO4fD-
public Page(){ uc<XdFcu
}@J&yrqg
} Q.7Rv
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/** construct the page by everyPage FY)v rM*yh
* @param everyPage w|pk1~c(_
* */ 1_%jDMYH
public Page(int everyPage){ .;ml[DXH
this.everyPage = everyPage; "aHY]E{
} nud,ag
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/** The whole constructor */ */sVuD^b`
public Page(boolean hasPrePage, boolean hasNextPage, Z#BwJHh
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i
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int everyPage, int totalPage, kbJ/7
int currentPage, int beginIndex){ mq`N&ABO!K
this.hasPrePage = hasPrePage; \j !JRD+j
this.hasNextPage = hasNextPage; %Rj:r!XB:
this.everyPage = everyPage; W?mn8Y;{`
this.totalPage = totalPage; QMea2q|3$
this.currentPage = currentPage; %_;q<@9)
this.beginIndex = beginIndex; {(]B{n
} 7Oe |:Z
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/**
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* @return XL c&7
* Returns the beginIndex. -BfZ P5
*/ ;Xg6'yxJ
publicint getBeginIndex(){ b)J(0,9`G"
return beginIndex; e.hHpjWi?Z
} b2u_1P\
} R!-*Wk
/** m [7@l
* @param beginIndex q66!xhp;?
* The beginIndex to set. sc
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*/ O& k+;r
publicvoid setBeginIndex(int beginIndex){ ?
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this.beginIndex = beginIndex; GyQu?`
} s)X'PJ0&Bs
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/** \nT, NV11
* @return >KXSb@
* Returns the currentPage. s{x{/Bp(KK
*/ cnJ(Fv_F$
publicint getCurrentPage(){ &?C%
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return currentPage; s<,[xkMB
} QII-9RxX"
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/** A3D"b9<D
* @param currentPage <nDuN*|
* The currentPage to set. t@(S=i7}-
*/ 3>;zk#b2
publicvoid setCurrentPage(int currentPage){ MQ7d IUs
this.currentPage = currentPage; bso l>M[<
}
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/** .:gZ*ks~
* @return 6\"g,f
* Returns the everyPage. 9>,$q"M}?
*/ Y&M}3H>E
publicint getEveryPage(){ fui;F"+1
return everyPage; {jB& e,
} ajB4Lj,:r
? t<yk(q
/** d$.t0-lC
* @param everyPage ;s{k32e
* The everyPage to set. NvCq5B$C
*/ S9BwCKH
publicvoid setEveryPage(int everyPage){ \yDr
this.everyPage = everyPage; :f<:>"<
}
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/** Q'-g+aN
* @return :: IAXGH)
* Returns the hasNextPage. qQ\&]
*/ V`:iun^f
publicboolean getHasNextPage(){ J*HZ=6L
return hasNextPage; qy@v,a
} M.B0)
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/** 5-rG 8
* @param hasNextPage Y:UDte[Lb
* The hasNextPage to set. ErZYPl
*/ 3%`asCW$
publicvoid setHasNextPage(boolean hasNextPage){ ?+6w8j%\
this.hasNextPage = hasNextPage; `Hj{XIOx
} &oi*]:<FNe
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/** l6o?(!:!%
* @return \X&LrneR"t
* Returns the hasPrePage. 7-Bttv{
*/ EPO*{bN7O
publicboolean getHasPrePage(){ Tgxxm
return hasPrePage; $'m&RzZ
} %K@s0uQ
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/** ynkPI6o
* @param hasPrePage J*4byu|
* The hasPrePage to set. }M_Yn0(3
*/ C|"BMam
publicvoid setHasPrePage(boolean hasPrePage){ *WS'C}T
this.hasPrePage = hasPrePage; 4n1-@qTPF~
} 4q%hn3\
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/** #Z%?lx"Q0
* @return Returns the totalPage. M@)^*=0H
* [+7 Nu
*/ f(=3'wQ
publicint getTotalPage(){ Hz A+Oi
return totalPage; B^8]quOH
} y9<]F6TT
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/** sT&O %(
* @param totalPage UC@&! kM
* The totalPage to set. 42 6l:>D(
*/ aX`@WXK
publicvoid setTotalPage(int totalPage){ fMg3
this.totalPage = totalPage; 2VSs#z!
} f9`F~6$
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} {/Mz/|%
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 2y_R05O0
ykq9]Xqhv
个PageUtil,负责对Page对象进行构造: >$^v@jf
java代码: Y@&1[Z
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/*Created on 2005-4-14*/ a04I.5!
package org.flyware.util.page; Z{'.fq2A
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import org.apache.commons.logging.Log; [X9s\H
import org.apache.commons.logging.LogFactory; 52RFB!Z[
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/** 4KO2oIR
* @author Joa kTCWyc
* Kr;7~`$[
*/ K@0gBgN
publicclass PageUtil { G"_ 8`l
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privatestaticfinal Log logger = LogFactory.getLog :Fvd?[
7&I+mw/X
(PageUtil.class); RU r0K#]
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/** |.8lS3C
* Use the origin page to create a new page 6Vq]AQx
* @param page BK+(Uf;g
* @param totalRecords O-5s}RT
* @return ^N{Lau
*/ gWqO5C~h
publicstatic Page createPage(Page page, int WKHEU)'!
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totalRecords){ Ng;K-WB\
return createPage(page.getEveryPage(), !;[cm|<