Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 *r)dtI*
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 .^8rO,H[
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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 PIHKSAnq
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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 MDCwgNPiQW
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分页支持类: 89UR w9
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java代码: pfQ3Y$z
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package com.javaeye.common.util; gjzU%{T?
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import java.util.List; NAX`y2z
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publicclass PaginationSupport { D< 0))r
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publicfinalstaticint PAGESIZE = 30; Uf9L*Z'6il
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privateint pageSize = PAGESIZE; WsW] 1p
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privateList items; U#`2~Qv/1
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privateint totalCount; " ~q~)T1Z
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privateint[] indexes = newint[0]; tA^CuJR
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privateint startIndex = 0;
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public PaginationSupport(List items, int :xk+`` T
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totalCount){ X/h|;C*9
setPageSize(PAGESIZE); MS\?+8|SV(
setTotalCount(totalCount); kAs=5_?I
setItems(items); "gt1pf~y
setStartIndex(0); _6 @GT
} xy4P_
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public PaginationSupport(List items, int ~9#'s'
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totalCount, int startIndex){ F{Oaxn
setPageSize(PAGESIZE); W4(GI]`_+
setTotalCount(totalCount); ,z#S=I
setItems(items); 0,B"p
setStartIndex(startIndex); .:O($9^Ho
} :r7!HG_
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public PaginationSupport(List items, int 7bQST0 ?
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totalCount, int pageSize, int startIndex){ xT-`dS0u
setPageSize(pageSize); OHt^e7\
setTotalCount(totalCount); TLq^5,qG
setItems(items); 6?a z
setStartIndex(startIndex); .yHi"ss3
} eQ*zi9na
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publicList getItems(){ rDGrq9
return items; JAy-N bb\
} v6ei47-
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publicvoid setItems(List items){ D^6Q`o
this.items = items; jp|*kBDq\
} _w2%!+'
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publicint getPageSize(){ gAgF$H .
return pageSize; E=91k.
} \Nk578+AA
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publicvoid setPageSize(int pageSize){ )4N1EuD6
this.pageSize = pageSize; ]|u7P{Z"R
} -@@
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publicint getTotalCount(){ s1t kiX{>
return totalCount; 1jE {]/Y7&
} y;_F[m
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publicvoid setTotalCount(int totalCount){ WWC&-Ni
if(totalCount > 0){ @>&b&uj7T
this.totalCount = totalCount; x~F YG
int count = totalCount / 7a=ul:
6 X'#F,M
pageSize; ">MsV/
if(totalCount % pageSize > 0) t{,e{oZx
count++; !?lvmq
indexes = newint[count]; J:OP*/@='
for(int i = 0; i < count; i++){ )G-u;1rd
indexes = pageSize * Wiw~oXo
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} #fk1'c2
}else{
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this.totalCount = 0; a^_W}gzzd
} wc-v]$DW
} db@^CS[P
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publicint[] getIndexes(){ QEMT'Cs
return indexes; *j=58d`n
} Ti7
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publicvoid setIndexes(int[] indexes){ !tb!%8{~
this.indexes = indexes; |oSqy
} g yegdky3
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publicint getStartIndex(){ ;j
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return startIndex; nM *}VI
} bYqv)_8
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publicvoid setStartIndex(int startIndex){ KK{_s=t%<
if(totalCount <= 0) lM#,i\8Q
this.startIndex = 0; o ZQ@ Yu3
elseif(startIndex >= totalCount) 7]ySj<1
this.startIndex = indexes aX*9T8H/
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[indexes.length - 1]; {&L^|X
elseif(startIndex < 0) OUFy=5(%:
this.startIndex = 0; /F46Ac}I
else{ #l@P}sHXq
this.startIndex = indexes *.KVrS<B1
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[startIndex / pageSize]; #f%fY%5q
} FA := )
} 947;6a%$
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publicint getNextIndex(){ w'XN<RWA
int nextIndex = getStartIndex() + j\zlp
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pageSize; s0:M'wA
if(nextIndex >= totalCount) j@Pd"
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return getStartIndex(); 7GS4gSd3
else 5ArgM%
return nextIndex; PKC0Dt;F.
} VMe
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publicint getPreviousIndex(){ n-{ d7haOa
int previousIndex = getStartIndex() - x+ER 3wDD@
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pageSize; mSvSdKKKlI
if(previousIndex < 0) U$3DIJVI
return0; 8@LUL)"
else 6RguUDRQ
return previousIndex; >P:U9
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} k+*pg4'
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} 6 EfBz
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抽象业务类 '.<c[Mp
java代码: cd=|P?Bi
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/** !Q5,Zhgr
* Created on 2005-7-12 hc3tzB
*/
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package com.javaeye.common.business; ob'"
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import java.io.Serializable; *|y$z+g/
import java.util.List; ~j(vGO3JB
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import org.hibernate.Criteria; uqU&k@
import org.hibernate.HibernateException; bsr]Z&9rrk
import org.hibernate.Session; :I7mMy*
import org.hibernate.criterion.DetachedCriteria; 4_sJ0 =z-
import org.hibernate.criterion.Projections; R*0mCz^+h
import #sBL E
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org.springframework.orm.hibernate3.HibernateCallback; G
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import JtsXMZz
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org.springframework.orm.hibernate3.support.HibernateDaoS >)G[ww[
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upport; >d &0a:
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import com.javaeye.common.util.PaginationSupport; 'o4`GkNh)
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public abstract class AbstractManager extends :zq Un&k&
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HibernateDaoSupport { *W`7JL,
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privateboolean cacheQueries = false; c
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privateString queryCacheRegion; zwRF-{s
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publicvoid setCacheQueries(boolean &BNlMF
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cacheQueries){ 7R
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this.cacheQueries = cacheQueries; NZ&ZK@h}.
} UKV<Ye|
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publicvoid setQueryCacheRegion(String `LLmdm 6i
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queryCacheRegion){ +N7<[hE;
this.queryCacheRegion = lJ]QAO
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queryCacheRegion; u\=
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} F?"Gln~;
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publicvoid save(finalObject entity){ _9H]:]1QH
getHibernateTemplate().save(entity); d>W#c8X>
} {.p;V
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publicvoid persist(finalObject entity){ %&VI-7+K
getHibernateTemplate().save(entity); ujkWVE'
} _b>{:H&\
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publicvoid update(finalObject entity){ @ S[As~9X
getHibernateTemplate().update(entity); S[yrGX8lu
} VpAwvMw
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publicvoid delete(finalObject entity){ kksffzG
getHibernateTemplate().delete(entity); [!wJIy?,
} /kK!xe
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publicObject load(finalClass entity, | 4}Y:d
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finalSerializable id){ \`["IkSg7
return getHibernateTemplate().load hmOGteAf-
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(entity, id); x V`l6QS
} 4 qY
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publicObject get(finalClass entity, 1KGf @u%-1
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finalSerializable id){ 00f'G2n
return getHibernateTemplate().get MUv#8{+F'/
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(entity, id); y!}XlllV
} Vy[xu$y
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publicList findAll(finalClass entity){ }F/w34+;
return getHibernateTemplate().find("from >B~?
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" + entity.getName()); [>pBz3fn,
} @_$$'XA7
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publicList findByNamedQuery(finalString @Lf&[_
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namedQuery){ ^'M^0'_"v
return getHibernateTemplate X$1YvYsID
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().findByNamedQuery(namedQuery); fe`_0lxj
} _[rQt8zn
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publicList findByNamedQuery(finalString query, j$XaO%y)
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finalObject parameter){ 60$;Q,]o
return getHibernateTemplate _F`JFMS
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().findByNamedQuery(query, parameter); c/^jD5U7
} $RRX-
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publicList findByNamedQuery(finalString query, RPf <-J:t
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finalObject[] parameters){ 4r~K`)/S'
return getHibernateTemplate |ka/5o
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().findByNamedQuery(query, parameters); `{h)-Y``
} dR< d7
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publicList find(finalString query){ kRwUR34yc
return getHibernateTemplate().find hDSf>X_*_G
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(query); irq{ 21
} uKXD(lzX
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publicList find(finalString query, finalObject U*\K<fw
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parameter){ s$fX
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return getHibernateTemplate().find Ai[@2A yU
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(query, parameter); S2Ez}*plp
} .81Y/Gad_
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public PaginationSupport findPageByCriteria }v|_]
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(final DetachedCriteria detachedCriteria){ XR7v\rd
return findPageByCriteria rFzj\%xa[
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); )D/,QWk
} w}OBp^V^
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public PaginationSupport findPageByCriteria l=l$9H,
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(final DetachedCriteria detachedCriteria, finalint %bF157X5An
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startIndex){ LS9,:!$
return findPageByCriteria I}|a7,8
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(detachedCriteria, PaginationSupport.PAGESIZE, Nj2l>[L;
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startIndex); .AO-S)wHR
} Op]*wwI*h
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public PaginationSupport findPageByCriteria 9{Et v w
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(final DetachedCriteria detachedCriteria, finalint 6.KEe^[-
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pageSize, Jh&DL8`
finalint startIndex){ P/1YN
return(PaginationSupport) 1|xe'w{
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getHibernateTemplate().execute(new HibernateCallback(){ =JfwHFHd#
publicObject doInHibernate 9oGcbD4*
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(Session session)throws HibernateException { XLaD#J
Criteria criteria = =:w,wI.
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detachedCriteria.getExecutableCriteria(session); &@CUxK
int totalCount = j|Vl\Z&o)
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((Integer) criteria.setProjection(Projections.rowCount 1`L.$T,1!
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()).uniqueResult()).intValue(); m^qFaf)6
criteria.setProjection K`9~#Zx$
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(null); 4D<C;>*/b
List items = O<L=N-
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criteria.setFirstResult(startIndex).setMaxResults 8/tB?j
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(pageSize).list(); j_}:=3
PaginationSupport ps = 0%L:jq{5
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new PaginationSupport(items, totalCount, pageSize, t'At9<ib
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startIndex); 579D
return ps; ZpOME@9,
} LkzA_|8:D
}, true); :* ]#n
} XK/l1E3N
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public List findAllByCriteria(final 62'9lriQ
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DetachedCriteria detachedCriteria){ >I~Q[
return(List) getHibernateTemplate =Jw*T[ E
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().execute(new HibernateCallback(){ |3B<;/v5
publicObject doInHibernate 7~Inxk;
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(Session session)throws HibernateException { KyVzf(^
Criteria criteria = BRY/[QRqZ
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detachedCriteria.getExecutableCriteria(session); tR<#CCtRp'
return criteria.list(); 0vSPeZ
} juF=ZW%i
}, true); 5&EBUl}
} d-Z2-89K
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public int getCountByCriteria(final jG{?>^
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DetachedCriteria detachedCriteria){ Lm`-q(!7w
Integer count = (Integer) rBQ<5.
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getHibernateTemplate().execute(new HibernateCallback(){ nF]R"
publicObject doInHibernate VvP: }yJ
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(Session session)throws HibernateException { <v'[Wl@hq
Criteria criteria = q#c+%,Z=C
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detachedCriteria.getExecutableCriteria(session); ,ps?@lD
return BI,]pf;GWv
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criteria.setProjection(Projections.rowCount psIo[.$rTk
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()).uniqueResult(); hwe6@T.#
} 7Rtjm
}, true); 6g#yzex
return count.intValue(); 7.G"U
} SODHn9)
} PbvA~gm
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用户在web层构造查询条件detachedCriteria,和可选的 &P}t<;
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 7z3tDE[#
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PaginationSupport的实例ps。 sDg1nKw(
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ps.getItems()得到已分页好的结果集 ?nL,Otz
ps.getIndexes()得到分页索引的数组 d\3 %5Y
ps.getTotalCount()得到总结果数 1QmOUw}yj
ps.getStartIndex()当前分页索引 d]|K%<+(
ps.getNextIndex()下一页索引 _>`9]6\&
ps.getPreviousIndex()上一页索引 @,,G]4zZ!
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 q~aj"GD
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 G+2fmVB*X
> fV"bj.
一下代码重构了。 7O|`\&RYR
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我把原本我的做法也提供出来供大家讨论吧: f &NX~(
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首先,为了实现分页查询,我封装了一个Page类: 5K?/-0yG
java代码: IOxtuR
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/*Created on 2005-4-14*/ ->;2CcpHB
package org.flyware.util.page; (AjgLNB
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/** fsEQ4xN'
* @author Joa E6xdPjoWy
* p]y.N)a
*/ SfY 5Xgp
publicclass Page { G,<d;:
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/** imply if the page has previous page */ [x,
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privateboolean hasPrePage; -:r<sv$
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/** imply if the page has next page */ t~ I;IB
privateboolean hasNextPage; ~$^>Vo
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/** the number of every page */ 9:xs)t- _
privateint everyPage; l+y;>21sTu
sb_/FE5e
/** the total page number */ cg]Gt1SU
privateint totalPage; Qp:m=f6@
/ s Apj
/** the number of current page */ \@h$|nb
privateint currentPage; nLk`W"irM
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/** the begin index of the records by the current se>\5k
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query */ /TB{|_HbW
privateint beginIndex; ^A\(M%*F
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/** The default constructor */ Pz
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public Page(){ QAo/d4
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} Oop6o$k
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/** construct the page by everyPage %{V7|Azt
* @param everyPage Fo;J3<U)
* */ yoe@]c=
public Page(int everyPage){ =5^1Bl
this.everyPage = everyPage; hCgk78O?
} H*N{4zBB
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/** The whole constructor */ @U?&1.\
public Page(boolean hasPrePage, boolean hasNextPage, %52x:qGa
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int everyPage, int totalPage, x7gd6"10^
int currentPage, int beginIndex){ 16@<G
this.hasPrePage = hasPrePage; F+BCzsm7$
this.hasNextPage = hasNextPage; :YkAp9civ
this.everyPage = everyPage; /7+b.h])^
this.totalPage = totalPage; =\ 5f_g2M
this.currentPage = currentPage; G[u6X_Q
this.beginIndex = beginIndex; tZg)VJQys
} vy={ziJ
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/** /D|q-`*K
* @return s]A8C^;c
* Returns the beginIndex. ;[P>
*/ 5f0g7w =-
publicint getBeginIndex(){ #M#$2Vt
return beginIndex; x)$0Nr62D
} t3^`:T\
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/** jVoD9H
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* @param beginIndex iY,oaC~?"N
* The beginIndex to set. \C>vj+!cJ
*/ j}tGcFwvSN
publicvoid setBeginIndex(int beginIndex){ ^ )!eiM
this.beginIndex = beginIndex; '+iLW~
} (IjM
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/** ~@@$-,}X
* @return @6R6.i5d
* Returns the currentPage. p9\*n5{
*/ <|G!Qn?2-
publicint getCurrentPage(){ {w"Cr0F,
return currentPage; }$uwAevP{y
} `0_
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/** Vom,^`}
* @param currentPage VhMVoW
* The currentPage to set. #
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*/ \3K7)o^
publicvoid setCurrentPage(int currentPage){ GA[bo)"
this.currentPage = currentPage; c3#eL
} H{9P=l
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/** Z1$U[Tsd
* @return 8D? $@!-
* Returns the everyPage. /yx)_x{
*/ &e*@:5Z:k
publicint getEveryPage(){ Hdd3n6*
return everyPage; Mty[)+se
} fTK84v"7_
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/** b"trg {e
* @param everyPage &{qKoI]
* The everyPage to set. >RJ&b
*/ eFA,xzp
publicvoid setEveryPage(int everyPage){ yQ<h>J>
this.everyPage = everyPage; B *6ncj
} LIz'hfS!
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/** mZ:#d;0
* @return r>*+d|c4
* Returns the hasNextPage. HmU6:8V
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*/ `pDTjJ
publicboolean getHasNextPage(){ +`V<&
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return hasNextPage; '+g[n
} v*As:;D_
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/** FQ47j)p;
* @param hasNextPage K:AP 0Te
* The hasNextPage to set. Nx*1m
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*/ ;qWSfCt/^
publicvoid setHasNextPage(boolean hasNextPage){ "VoufXM:
this.hasNextPage = hasNextPage; ;g2UIb?{6
} +7_U(|gO
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/** B~&}Mv
* @return *|CvK&7
* Returns the hasPrePage. -rgdKA@)(
*/ yUxz,36wZ
publicboolean getHasPrePage(){ II~91IEk
return hasPrePage; : vgn0IQ
} aiE\r/k8s
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/** 1_c%p#?K
* @param hasPrePage GM)q\Hx{
* The hasPrePage to set. jk\V2x@DR
*/ Y"s8j=1m
publicvoid setHasPrePage(boolean hasPrePage){ Pq(LW(
this.hasPrePage = hasPrePage; cyabqx
} i`vy<Dvpz
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/** \\Q){\S
* @return Returns the totalPage. 3=Rk(%:;
* Q%J,:J
*/ S}]B |Q
publicint getTotalPage(){ ^\J-LU|"B
return totalPage; GY0OVAW6'c
} R2 J A(Hn
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/** jWh)bsqI!
* @param totalPage Z
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* The totalPage to set. [EZ=t k
*/ Y(?SE< 4R
publicvoid setTotalPage(int totalPage){ |68/FJZ,5
this.totalPage = totalPage; m^TN6/])
} ObS#aRq
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} B8.}9
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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 nvNF~)mu
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个PageUtil,负责对Page对象进行构造: ) vVf- zU
java代码: WQD:~*C:
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/*Created on 2005-4-14*/ fM*?i"j;Y
package org.flyware.util.page; G8/q&6f_
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import org.apache.commons.logging.Log; ]\L+]+u~
import org.apache.commons.logging.LogFactory; ];b+f@
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/** fH:S_7i
* @author Joa {{gt>"D,
* T-/3
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*/ FCKyKn
publicclass PageUtil { =20
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)
privatestaticfinal Log logger = LogFactory.getLog lB_X mI1t
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(PageUtil.class); T3 4Z#PFwe
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/** @M'qi=s*
* Use the origin page to create a new page @v&