Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 "spAYk\
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Sy?O(BMo
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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 qh<h|C]V
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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 1s@%q
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分页支持类: ]l.qp5eQ
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java代码: Mc#w:UH[
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package com.javaeye.common.util; !0+!%Nr>J
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import java.util.List; Ka$YKY,
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publicclass PaginationSupport { b9(_bsc
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publicfinalstaticint PAGESIZE = 30; B- `,h pp
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privateint pageSize = PAGESIZE; 0s#`H
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privateList items; y:>'1"2`
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privateint totalCount; >,V~-Tp
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privateint[] indexes = newint[0]; .7"]/9oB
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privateint startIndex = 0; Eoo[)V#x{
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public PaginationSupport(List items, int vg6'^5S7
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totalCount){ hCcAAF*I;5
setPageSize(PAGESIZE); }%;o#!<N(@
setTotalCount(totalCount); V&75n.L
setItems(items); (6*CORE
setStartIndex(0); .*bu:FuDE
} r- :u*
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public PaginationSupport(List items, int O
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totalCount, int startIndex){ 0 kM4\En
setPageSize(PAGESIZE); 9O.okU
setTotalCount(totalCount); `qnNEJL,
setItems(items); S1B^FLe7X
setStartIndex(startIndex); [A.ix}3mm
} scsN2#D7U/
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public PaginationSupport(List items, int l; ._
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totalCount, int pageSize, int startIndex){ gq^j-!Q)Q<
setPageSize(pageSize); `<z"BGQ
setTotalCount(totalCount); Wt%+q{
setItems(items); *h `P+_Q7
setStartIndex(startIndex); 88GS Bg:YH
} ^"?fZSC
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publicList getItems(){ *QIlh""6
return items; 5ZX P$.
} #Oeb3U
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publicvoid setItems(List items){ ~KW|<n4m
this.items = items; Y$%z]i5
} Br,^4w[Hq
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publicint getPageSize(){ bAsoIra
return pageSize; YA:7^-Bv
} %ZajM
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publicvoid setPageSize(int pageSize){ c89+}]mGq
this.pageSize = pageSize; <h*r
} xDU{I0M
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publicint getTotalCount(){ DhVF^=x$
return totalCount; sr=~Uq{g
} gNsas:iGM
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publicvoid setTotalCount(int totalCount){ ( 2oP=9m
if(totalCount > 0){ +p%!G1Yz
this.totalCount = totalCount; ;_HG
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int count = totalCount / J*n Q(*e
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pageSize; OVo3.
if(totalCount % pageSize > 0) _>G.
count++; \%qzTk.&r
indexes = newint[count]; =41g9UQ
for(int i = 0; i < count; i++){ UcHe"mn
indexes = pageSize * Cm~Pn"K_]
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i; w[5uX>
} Zt;dPYq>
}else{ PLkwtDi+&
this.totalCount = 0; %a_ rYrL
} w=ib@_:f
} bK\Mn95]
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publicint[] getIndexes(){ TQ{rg2_T
return indexes; Vw^2TRU
} %|tDb
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publicvoid setIndexes(int[] indexes){ !>,\KxnM
this.indexes = indexes; /f5*KRM
} Qcy
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publicint getStartIndex(){ kXfTNMb
return startIndex; kkyi`_ZKn
} 6 cF~8
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publicvoid setStartIndex(int startIndex){ Aa.eu=@I
if(totalCount <= 0) d'oh-dj %^
this.startIndex = 0; p-6Y5$Y
elseif(startIndex >= totalCount) pdz_qj!Z
this.startIndex = indexes d3m!34ml
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[indexes.length - 1]; LXZ0up-B-
elseif(startIndex < 0) _6tir'z
this.startIndex = 0; o4%H/|Oq.
else{ )}/ ycTs
this.startIndex = indexes ]tjQy1M
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[startIndex / pageSize]; %`M IGi#
} ,R-T( <r
} 0gLl>tF[H
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publicint getNextIndex(){ _uYidtxo=
int nextIndex = getStartIndex() + \4/zvlo]h
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pageSize; QgR3kc^7/
if(nextIndex >= totalCount) )g()b"Z
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return getStartIndex(); >{v,HOxl
else wX!q dII)
return nextIndex; L<}0}y
} ^Uj\s /
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publicint getPreviousIndex(){ iFJ1}0<(x
int previousIndex = getStartIndex() - FyF./
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pageSize; Ug VLHwkvk
if(previousIndex < 0) x%hV5KW
return0; Y-&SZI4H
else u/I|<NAC,
return previousIndex; XY_zFF
} vhEqHjR:
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} ^n @dC?
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抽象业务类 +E7Os|m
java代码: nT;Rwz$3
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/** K1gZ>FEY|N
* Created on 2005-7-12 M2$.Yom[
*/ P[G.LO
package com.javaeye.common.business; (uxe<'Co|
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import java.io.Serializable; |=o)|z2
import java.util.List; 1 iiQW
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import org.hibernate.Criteria; 9GV1@'<Y]
import org.hibernate.HibernateException; Qf>$'C(7!a
import org.hibernate.Session; 'o!{YLJ fM
import org.hibernate.criterion.DetachedCriteria; _x2i=SFo*$
import org.hibernate.criterion.Projections; ,Vc>'4E-
import I<``d Ne9Q
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org.springframework.orm.hibernate3.HibernateCallback; *\n-yx]
import h:4Uv}Z
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org.springframework.orm.hibernate3.support.HibernateDaoS 6w"_sK?
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upport; @{X<|,W9w
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import com.javaeye.common.util.PaginationSupport; ev{;}2~V
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public abstract class AbstractManager extends 2m*g,J?ql
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HibernateDaoSupport { &tJ!cTA.-
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privateboolean cacheQueries = false; Vq IzDs
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privateString queryCacheRegion; UqA<rW
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publicvoid setCacheQueries(boolean Jn#05Z
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cacheQueries){ <Wwcd8d
this.cacheQueries = cacheQueries; YAc~,N
} dPm_jX
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publicvoid setQueryCacheRegion(String t|5T,YFG
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queryCacheRegion){ \{@n>Mh
this.queryCacheRegion = $!ATj`}kb
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queryCacheRegion; T[L7-5U0
} C5F=J8pY
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publicvoid save(finalObject entity){ jY +u OH
getHibernateTemplate().save(entity); .,9e~6}
} *M]@}'N
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publicvoid persist(finalObject entity){ D^30R*gV
getHibernateTemplate().save(entity); O u-/dE%
} c{,VU.5/
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publicvoid update(finalObject entity){ nn?h;KzB
getHibernateTemplate().update(entity); y!kU0
} %`# HGji)
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publicvoid delete(finalObject entity){ Wp
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getHibernateTemplate().delete(entity); J6C/`)+w
} LFskNF0X
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publicObject load(finalClass entity, j`o_Stbg
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finalSerializable id){ ZYexW=@
return getHibernateTemplate().load GL^84[f-T
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(entity, id); I"hlLP
} i>aIuQ`pe
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publicObject get(finalClass entity, 7/969h^s
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finalSerializable id){ !LX)
return getHibernateTemplate().get $[xS>iuD
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(entity, id); 49Q
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} QUO'{;,
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publicList findAll(finalClass entity){ csd~)a nb
return getHibernateTemplate().find("from S11ME
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" + entity.getName()); 6>Z)w}x^
} np6R\Q!&
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publicList findByNamedQuery(finalString #WlTE&
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namedQuery){ 6g-Q
return getHibernateTemplate (~
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().findByNamedQuery(namedQuery); !zZ3F|+HB
} l8~s#:v6X
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publicList findByNamedQuery(finalString query, Q nTKo&|9
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finalObject parameter){ "sU jJ|
return getHibernateTemplate dZ,IXA yB
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().findByNamedQuery(query, parameter); 5XzN%<_h9
} d2U+%%Tdw
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publicList findByNamedQuery(finalString query, Fxx-2(U
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finalObject[] parameters){ pdySip<
return getHibernateTemplate E'cI} q
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().findByNamedQuery(query, parameters); <5]ufv
} gjL+8Rk
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publicList find(finalString query){ =fcM2O#$
return getHibernateTemplate().find k4-S:kVo
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(query); d^+0=_[PmK
} 5rH?FQE
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publicList find(finalString query, finalObject .2{*>Dzi
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parameter){ Y.b?.)u&
return getHibernateTemplate().find !!+LFe4su
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(query, parameter); L-DL)8;`
} r7jh)Q;BbR
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public PaginationSupport findPageByCriteria '>k1h.i
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(final DetachedCriteria detachedCriteria){ M3VTzwuf^S
return findPageByCriteria `>Ms7G9S~e
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); W
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} hYbaVE
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public PaginationSupport findPageByCriteria TZ#^AV=ae
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(final DetachedCriteria detachedCriteria, finalint :!/ (N
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startIndex){ qs>&Xn
return findPageByCriteria $U4[a:
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(detachedCriteria, PaginationSupport.PAGESIZE, ]YrgkC35
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startIndex); `4-N@h
} RpwDOG
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public PaginationSupport findPageByCriteria kD
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(final DetachedCriteria detachedCriteria, finalint B8~bx%)3T
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pageSize, 4YgO1}%G
finalint startIndex){ ~wQ M
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return(PaginationSupport) 'Ll'8 ps
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getHibernateTemplate().execute(new HibernateCallback(){ wlFK#iK
publicObject doInHibernate :;jRAjq"
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(Session session)throws HibernateException { ;]l`Q,*OXb
Criteria criteria = ,B#*<_?E5
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detachedCriteria.getExecutableCriteria(session); uhU'm@JZ
int totalCount = H6hhU'Kxf8
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((Integer) criteria.setProjection(Projections.rowCount >mj WC) U
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()).uniqueResult()).intValue(); vDIsawbHD
criteria.setProjection QIfP%,LT
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(null); uT>"(wnJ|
List items = jN!VrRA
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criteria.setFirstResult(startIndex).setMaxResults 6a704l%#hb
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(pageSize).list(); tB`IBuy9!"
PaginationSupport ps = bO*hmDt
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new PaginationSupport(items, totalCount, pageSize, K7t_Q8
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startIndex); 7AF6aog
return ps; =@D H hg
} )"J1ET,z
}, true); uFuP%f!yY
} !p Q*m`Xo
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public List findAllByCriteria(final KB{IWu
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DetachedCriteria detachedCriteria){ :<v@xOzxx
return(List) getHibernateTemplate YIF|8b\
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().execute(new HibernateCallback(){ 3G'cDemc
publicObject doInHibernate ^iWJqpLe
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(Session session)throws HibernateException { +LlAGg]Z
Criteria criteria = <Y"HCa{
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detachedCriteria.getExecutableCriteria(session); :1;"{=Yx}
return criteria.list(); 6]mAtA`Y
} d4) 0G-|
}, true); yZ)-=H
} p^w_-(p
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public int getCountByCriteria(final o1k+dJUd
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DetachedCriteria detachedCriteria){ xwj{4fzpk{
Integer count = (Integer)
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getHibernateTemplate().execute(new HibernateCallback(){ iI;np+uYk
publicObject doInHibernate w,j;XPp
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(Session session)throws HibernateException { B>[myx
Criteria criteria = ^\r{72!y
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detachedCriteria.getExecutableCriteria(session); ANfy+@
return pLM?m
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criteria.setProjection(Projections.rowCount \(}pm#O
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()).uniqueResult(); `/9I` <y
} {"*_++|
}, true); pb G5y7
return count.intValue(); j=c< Lo`
} LP/SblE
} a*t>Ks'C
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用户在web层构造查询条件detachedCriteria,和可选的 GiKhdy
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ~%h&ELSw
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PaginationSupport的实例ps。 v5&W)F
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ps.getItems()得到已分页好的结果集 ge1U1o
ps.getIndexes()得到分页索引的数组 (hh^?
ps.getTotalCount()得到总结果数 Kw2]J)TO
ps.getStartIndex()当前分页索引 `6BQ6)7
ps.getNextIndex()下一页索引 Wz#ZkNO
ps.getPreviousIndex()上一页索引 IJC]Al,df
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 xe9\5Gb}
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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 9<
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一下代码重构了。 I}m>t}QRI_
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我把原本我的做法也提供出来供大家讨论吧: c~}FYO$
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首先,为了实现分页查询,我封装了一个Page类: nU 0##
java代码:
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/*Created on 2005-4-14*/ Kjpsz] ;
package org.flyware.util.page; lTVz'ys
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/** F~~9/#
* @author Joa F%4N/e'L
* #B
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*/ )6eFYt%c
publicclass Page { K92M9=>
@, AB2D
/** imply if the page has previous page */ O&}R
privateboolean hasPrePage; rDu?XJA
KuEM~Q=
/** imply if the page has next page */ LR'~:46#u
privateboolean hasNextPage; ,Ek6X)|@
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/** the number of every page */ b@sq}8YD|z
privateint everyPage; (`u+(M!^
.4[M-@4+]
/** the total page number */ ylDfr){
privateint totalPage; = )4bf"~8
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/** the number of current page */ Cv/3-&5S
privateint currentPage; Ns#L9T#
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/** the begin index of the records by the current ymT]ow6C
prB:E[1
query */ 8#4Gs Q"
privateint beginIndex; um\A
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/** The default constructor */ _d+` Gw
public Page(){ 9>ZX@1]m_
vV*/"'>
} JeAyT48!M
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/** construct the page by everyPage FI)0.p
* @param everyPage !!mGsgnW
* */ F5M{`:/
public Page(int everyPage){ 8%xiHPVg
this.everyPage = everyPage; woN
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} |uX&T`7?-
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/** The whole constructor */ }:1qK67S
public Page(boolean hasPrePage, boolean hasNextPage, I*mBU^<9V
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int everyPage, int totalPage, 2P{! n#"
int currentPage, int beginIndex){ \lyHQ-gWhc
this.hasPrePage = hasPrePage; = N:5#A
this.hasNextPage = hasNextPage; W9bpKmc
this.everyPage = everyPage; 6)FM83zk)K
this.totalPage = totalPage; pBn;:
this.currentPage = currentPage; P(3$XMx
this.beginIndex = beginIndex; :K(+ KN(
} RER93:(
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/** A-eCc#I
* @return =,&{ &m)
* Returns the beginIndex. zOJzQZ~
*/ W#wC
publicint getBeginIndex(){ @v.?z2h
return beginIndex; u!b0<E
} 3ZvQUH/{W
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/** maV*+!\
* @param beginIndex a`Q-5*\;z
* The beginIndex to set. SL_JA
*/ Ppx 4#j
publicvoid setBeginIndex(int beginIndex){ WckWX]};S
this.beginIndex = beginIndex; pwF])uf*{\
} zCu+Oi6
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/** gV'=uz v
* @return -NDB.~E^DJ
* Returns the currentPage. %*Yb
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*/ tcI Z
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publicint getCurrentPage(){ +Lo,*
return currentPage; *P`k |-
} SW Hi iF@
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/** nrM-\'
* @param currentPage fOk(ivYy
* The currentPage to set. |1T[P)Q
*/ `|:` yl
publicvoid setCurrentPage(int currentPage){ uFOYyrESc
this.currentPage = currentPage; ={{q_G\WD
} e C&!yY2g
K=dG-+B~}
/** Cn>t"#zs!~
* @return |]?7r?=J9v
* Returns the everyPage. #Q|ACNpYM
*/ <,9rXjeRl
publicint getEveryPage(){ ETfoL.d$(
return everyPage; 4c.!^EiV
} 0X%#9s~
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/** |Lc.XxBkc
* @param everyPage 5g 2:o^
* The everyPage to set. l585L3i
*/ }w)wW1&
publicvoid setEveryPage(int everyPage){ 6O'Y@9#
this.everyPage = everyPage; }jg,[jw_"X
} *C^TCyBK;
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/** =z}M(<G
* @return T`Xz*\}Zb
* Returns the hasNextPage. >~T2MlRux
*/ [kI[qByf
publicboolean getHasNextPage(){ ,4(m.P10
return hasNextPage; WX$AOnEv
} ?nf4K/IjZ!
}/7rA)_
/** ?6:e%YT
* @param hasNextPage jf&
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* The hasNextPage to set. m .^WSy
*/ ~vfPsaRh
publicvoid setHasNextPage(boolean hasNextPage){ e ,A9N%M
this.hasNextPage = hasNextPage; @%6"xnb`
} ?C_Y2JY
DF"*[]^[
/** So#>x5dL
* @return z>spRl,dr
* Returns the hasPrePage. >W'"xK|:
*/
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publicboolean getHasPrePage(){ f5.Be%
return hasPrePage; Vv>hr+e
} *(nu0
Bo/i =/7%
/** 8ya|eJ]/L
* @param hasPrePage ?lIh&C8]X
* The hasPrePage to set. 1xsB@D
*/ T?D]]x
publicvoid setHasPrePage(boolean hasPrePage){ x|3G}[=
this.hasPrePage = hasPrePage; ^]$rh.7&
} ~|`jIqU
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yTg
/** 44UN*_qG
* @return Returns the totalPage. n5?7iU&JIo
* ymA8`k5>@
*/ ;oRgg'k<
publicint getTotalPage(){ ABhQ7
x|
return totalPage; p1,.f&(f
} z-`4DlJUS
IVG77+O# }
/** /ASpAl[J
* @param totalPage A*? Qm
* The totalPage to set. Kuh)3/7
*/ @G=_nZxv
publicvoid setTotalPage(int totalPage){ 49 1 1
this.totalPage = totalPage; m>'#664q1
} kfy|3KA3m
5+*CBG}
} 2Vg+Aly4D
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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 ;x4yidb6
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个PageUtil,负责对Page对象进行构造: *0%G`Q
java代码: n*N`].r#{=
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/*Created on 2005-4-14*/ 2B]mD-~
package org.flyware.util.page; +InFv"wt
qApf\o3[0
import org.apache.commons.logging.Log; Oa7jLz'i
import org.apache.commons.logging.LogFactory; uq@_DPA7
4-q8:5
/** _MUSXB'
* @author Joa Qx77%L4
* vi0nJ -Xg
*/ qLm
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publicclass PageUtil { wmFS+F4`2
{OW.^UIq^
privatestaticfinal Log logger = LogFactory.getLog BE," lX
t8"yAYj
(PageUtil.class); CNyV6jb
fb|lWEw5h.
/** c]/&xRd
* Use the origin page to create a new page +v|]RgyW)
* @param page ,a}
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* @param totalRecords /QVhT
* @return IL<@UWs6
*/ bH_zWk
publicstatic Page createPage(Page page, int 5x'
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totalRecords){ hdxq@%Vs
return createPage(page.getEveryPage(), 7By&cdl
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page.getCurrentPage(), totalRecords); UN`O*(k[
} rs:a^W5t
SR {KL#NC
/** AJ85[~(lX
* the basic page utils not including exception LW+^m6O
hN.{H:skL)
handler lNqF@eCT9
* @param everyPage CWM_J9f
* @param currentPage 7bx!A+, t
* @param totalRecords %x|0<@b7-
* @return page $jv/00:&
*/ xtRHb''FX
publicstatic Page createPage(int everyPage, int Z66q0wR7
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currentPage, int totalRecords){ N(L?F):fT
everyPage = getEveryPage(everyPage); )zq sn
currentPage = getCurrentPage(currentPage); " IC0v9
int beginIndex = getBeginIndex(everyPage, /}RW~ax
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currentPage); Y+_t50S
int totalPage = getTotalPage(everyPage, mdukl!_x
f#zm}+,`
totalRecords); DbvKpM H
boolean hasNextPage = hasNextPage(currentPage, ^EmI;ks
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totalPage); >^
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boolean hasPrePage = hasPrePage(currentPage); y4N=v{EbL
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returnnew Page(hasPrePage, hasNextPage,
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everyPage, totalPage, ?DKwKt
currentPage, KJN{p~Q
e'1}5Ky
beginIndex); Ra^GbT|Z
} nn6&`$(Q~
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