Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 jcF/5u5e
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 uY;-x~Z
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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 7>EjP&l
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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 LQSno)OZ
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分页支持类: -\@&^e
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java代码: hqVx%4s*J
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package com.javaeye.common.util; V ^=o@I
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import java.util.List; mPGF Y
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publicclass PaginationSupport { v"Bv\5f,Ys
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publicfinalstaticint PAGESIZE = 30; b9HE #*d,
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privateint pageSize = PAGESIZE; +vfk+6
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privateList items; +ib72j%A
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privateint totalCount; %(b`i C9
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privateint[] indexes = newint[0]; Nzz" w_#
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privateint startIndex = 0; 94"R&|
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public PaginationSupport(List items, int ]>K%,}PS
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totalCount){ ,dKcxp~[
setPageSize(PAGESIZE); 5nzkZw
setTotalCount(totalCount); )` S,vF~
setItems(items); [Z0 &`qz
setStartIndex(0); yB(^t`)}N
} ]c8lZO>
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public PaginationSupport(List items, int 3/o-\wWO
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totalCount, int startIndex){ vBQ|h
setPageSize(PAGESIZE); nGGYKI
setTotalCount(totalCount); 6gfv7V2H
setItems(items); Zr'VA,v
setStartIndex(startIndex); ihKnZcI$i
} y1^<!I
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public PaginationSupport(List items, int d}%GHvOi
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totalCount, int pageSize, int startIndex){ {$ 4fRxj
setPageSize(pageSize); 25h.u>6@{
setTotalCount(totalCount); X:+;d8rCy
setItems(items); :<Y,^V(
setStartIndex(startIndex); T<~NB5&f
} #)_4$<P*'
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publicList getItems(){ S/]2Qt#T
return items; erYpeq.
} ~:Dr]kt
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publicvoid setItems(List items){ Ab
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this.items = items; om$)8'A,l
} v"6q!
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publicint getPageSize(){ '~%1p_0dq
return pageSize; 2J9_(w
} X'e@(I!0
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publicvoid setPageSize(int pageSize){ )#Ea~>v
this.pageSize = pageSize; 5YMjvhr?W
} He. gl
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publicint getTotalCount(){ W1M<6T.{7
return totalCount; =:mD)oX*
} &%L1n?>Q}
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publicvoid setTotalCount(int totalCount){ Uaj8}7v
if(totalCount > 0){ *^ncb,1+i
this.totalCount = totalCount; &(-+?*A`E
int count = totalCount / !6\{q
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pageSize; N|?"=4Z?
if(totalCount % pageSize > 0) |/[?]`
count++; jTaEaX8+
indexes = newint[count]; `gfh]7T
for(int i = 0; i < count; i++){ #, W7N_mt
indexes = pageSize * 0Pu$1Fp
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i; `omZ'n)
} *xA&t)z(i
}else{ R
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this.totalCount = 0; WE 'afxgV
} ZJ'#XZpr
} Eic/#j{4
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publicint[] getIndexes(){ U-#wFc2N
return indexes; I0.{OJ-
} SaMg)s~B
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publicvoid setIndexes(int[] indexes){ c?"#x-<1s
this.indexes = indexes; 5;oWFl
}
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publicint getStartIndex(){ z{Z'2 ,#
return startIndex; 4*d$o=wa
} '@i/?rNi%N
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publicvoid setStartIndex(int startIndex){ 03L+[F&"?
if(totalCount <= 0) .Ebg>j:\
this.startIndex = 0; AK%`EsI^
elseif(startIndex >= totalCount) ?<bByxa
this.startIndex = indexes *=mtt^yZ
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[indexes.length - 1]; 9^QiFgJy
elseif(startIndex < 0) iyAeR!`
this.startIndex = 0; 9'faH
else{ <XiHQ
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this.startIndex = indexes e82SG8#]
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[startIndex / pageSize]; pca `nN!
} <43O,Kx'Su
} d}j%.JJK
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publicint getNextIndex(){ C|bnUN
int nextIndex = getStartIndex() + x>d,\{U
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pageSize; P!3)-apP\
if(nextIndex >= totalCount) IWERn
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return getStartIndex(); .(^KA{
else b^_#f:_j
return nextIndex; A^nB!veh
} SB0Cq
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publicint getPreviousIndex(){ l8 k@.<nCO
int previousIndex = getStartIndex() - t Sran
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pageSize; 6^y*A!xY
if(previousIndex < 0) ]Qm$S5tU
return0; d,AEV_
else `w';}sQA7
return previousIndex; bYQvh/(J
} 0F> ils
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} _ dEc? R}
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抽象业务类 #{KYsDtvx
java代码: >uT,Z,7O
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/** X)^eaw]Q0
* Created on 2005-7-12 E7X6Shng
*/ AGu#*,K
package com.javaeye.common.business; Z>
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import java.io.Serializable; p^QZGu-.W
import java.util.List; RQxL`7H
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import org.hibernate.Criteria; n]:Xmi8p
import org.hibernate.HibernateException; 4o?_G[
import org.hibernate.Session; " O0p.o
import org.hibernate.criterion.DetachedCriteria; EZnXS"z
import org.hibernate.criterion.Projections; U|SF;T
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import n'*4zxAA
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org.springframework.orm.hibernate3.HibernateCallback; )tYu3*'
import " E+V>V+
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org.springframework.orm.hibernate3.support.HibernateDaoS yTJ Eo\g/@
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upport; =`Ii?xo
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import com.javaeye.common.util.PaginationSupport; l@:Tw.+/9
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public abstract class AbstractManager extends -wn,7;
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HibernateDaoSupport { ov;1=M~RF
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privateboolean cacheQueries = false; ;B*im
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privateString queryCacheRegion; 'kBg3E$y
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publicvoid setCacheQueries(boolean wr);+.T9R
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cacheQueries){ y
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this.cacheQueries = cacheQueries; EZs"?A
} zI-]K,!
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publicvoid setQueryCacheRegion(String F(h
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queryCacheRegion){ RTC;Wj
this.queryCacheRegion = <c'0-=
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queryCacheRegion; Iu"7
} rfo7\'yk
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publicvoid save(finalObject entity){ suKr//_
getHibernateTemplate().save(entity); $?P 5A E
} ZZ'5BfI"I%
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publicvoid persist(finalObject entity){ +G:CR,Z>+
getHibernateTemplate().save(entity); 6_mkt|E=
} i?{)o]i
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publicvoid update(finalObject entity){ iYaS
getHibernateTemplate().update(entity); *Wj]e%
} p~Wy`g-
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publicvoid delete(finalObject entity){ deLLqdZa
getHibernateTemplate().delete(entity); w'uB&z4'
} 6W\G i>
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publicObject load(finalClass entity, m&MAA^ I
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finalSerializable id){ &&PXWR!%]
return getHibernateTemplate().load lcVZ 32MQ
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(entity, id); %eOO8^N
} gOy;6\/
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publicObject get(finalClass entity, wn-1fz<d
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finalSerializable id){ c-VIp A1
return getHibernateTemplate().get
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(entity, id); /@ww"dmqU
}
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publicList findAll(finalClass entity){ /hN;\Z[@
return getHibernateTemplate().find("from P,J+'.@
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" + entity.getName()); xovsh\s
} MxgJ+
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publicList findByNamedQuery(finalString *^oL$_Y
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namedQuery){ @{>0v"@
return getHibernateTemplate pC~M5(F_
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().findByNamedQuery(namedQuery); 1*GL;W~ix*
} fc&djd`FuX
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publicList findByNamedQuery(finalString query, ID:
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finalObject parameter){ JIiS/]KQ
return getHibernateTemplate ({3Ap{Q}
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().findByNamedQuery(query, parameter); \483S]_-z{
} N:q\i57x
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publicList findByNamedQuery(finalString query, A?bqDy
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finalObject[] parameters){ t6uYFxE
return getHibernateTemplate ds2%i
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().findByNamedQuery(query, parameters); VqUCcT
} B*(BsXQLY
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publicList find(finalString query){ @O`T|7v
return getHibernateTemplate().find uUiS:Tp]
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(query); |}? H$d
} +
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publicList find(finalString query, finalObject <Umr2Vw-
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parameter){ XV}}A^
return getHibernateTemplate().find 5sANF9o!
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(query, parameter); *_Vv(H&
} Lf)JO|o
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public PaginationSupport findPageByCriteria d_,Ql708f
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(final DetachedCriteria detachedCriteria){ b"aF-,M>
return findPageByCriteria hFo29oN
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); eBH:_Ls_-^
} dF[|9%)
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public PaginationSupport findPageByCriteria d>?C?F
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(final DetachedCriteria detachedCriteria, finalint le'
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startIndex){ A=0{}B#
return findPageByCriteria Y7zs)W8xTT
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(detachedCriteria, PaginationSupport.PAGESIZE, xL*J9&~iG
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startIndex); \HIBnkj)3n
} !?>QN'p.b
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public PaginationSupport findPageByCriteria 74ho=
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(final DetachedCriteria detachedCriteria, finalint sv!zY= 6
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pageSize, dk^jv +
finalint startIndex){ ]
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return(PaginationSupport) v6|j.;
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getHibernateTemplate().execute(new HibernateCallback(){ _9]vlxgtG(
publicObject doInHibernate -wrVEH8
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(Session session)throws HibernateException { \vJ0Mhk1
Criteria criteria = S6}_N/;6~
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detachedCriteria.getExecutableCriteria(session); oNIYO*[
int totalCount = < =~=IZ)
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((Integer) criteria.setProjection(Projections.rowCount zrqI^i"c
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()).uniqueResult()).intValue(); N,Z*d
criteria.setProjection 4 ob?M:S
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(null); o">~ObR
List items = 7~FHn'xt
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criteria.setFirstResult(startIndex).setMaxResults sfip AM
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(pageSize).list(); ht*(@MCr<
PaginationSupport ps = 5'NNwc\
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new PaginationSupport(items, totalCount, pageSize, =
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startIndex); vQ*RrHG?c
return ps; `kJ)E;v;3
} Pjk2tf0j`
}, true); ^8EW/$k
} xxyc^\$
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public List findAllByCriteria(final @!=Ds'MJC
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DetachedCriteria detachedCriteria){ .CnZMw{'
return(List) getHibernateTemplate /='0W3+o*L
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().execute(new HibernateCallback(){ *1Bq>h:
publicObject doInHibernate tVO}{[U}
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(Session session)throws HibernateException { kmc_%Wm}
Criteria criteria = F{;#\Ob
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detachedCriteria.getExecutableCriteria(session); r:$tvT*
return criteria.list(); \?]U*)B.r
} )2RRa^=&
}, true); cz,QP'g
} r}&&e BY
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public int getCountByCriteria(final J{^md0l
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DetachedCriteria detachedCriteria){ iphC\*F
Integer count = (Integer) iAZ8Y/
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getHibernateTemplate().execute(new HibernateCallback(){ i_Hm?Bi!F
publicObject doInHibernate {PX,_
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(Session session)throws HibernateException { gkO^J{_@q
Criteria criteria = ~1D^C |%
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detachedCriteria.getExecutableCriteria(session); bw zx_F/
return &muBSQ-
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criteria.setProjection(Projections.rowCount ttUK~%wSx
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()).uniqueResult(); I)V=$r{
} g%l ,a3"
}, true); 'o6}g p)
return count.intValue(); ",3v%$>
} I{OizBom
} beBG40
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用户在web层构造查询条件detachedCriteria,和可选的 b'\Q/;oz>
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 z^U+oG
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PaginationSupport的实例ps。 e?.j8Q~
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ps.getItems()得到已分页好的结果集 3T8d?%.l
ps.getIndexes()得到分页索引的数组 f-enF)z
ps.getTotalCount()得到总结果数 84QOW|1
ps.getStartIndex()当前分页索引 P !i_?M
ps.getNextIndex()下一页索引 ;Y\LsmZ;F
ps.getPreviousIndex()上一页索引 "G
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5P\>$N1p
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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 7.<jdp
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一下代码重构了。 y017
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我把原本我的做法也提供出来供大家讨论吧: -`I|=lBz{H
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首先,为了实现分页查询,我封装了一个Page类: bI &<L O
java代码: G`zNCx.
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/*Created on 2005-4-14*/ -5b|nQuY
package org.flyware.util.page; =@Oo3*>
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/** ^[7Mp
* @author Joa +a!3*G@N+
* h.X4x2(.
*/ Jj\4P1|' 7
publicclass Page { 9(^UchZZi
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/** imply if the page has previous page */ Ma|4nLC}
privateboolean hasPrePage; t,7%|
{
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/** imply if the page has next page */ hN2A%ds*(j
privateboolean hasNextPage; }qiZ%cT.G
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/** the number of every page */ 5)RZJrN]
privateint everyPage; !d N[9}
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/** the total page number */ =sYILe[
privateint totalPage; U*[E+Uq}:N
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/** the number of current page */ 0$)Q@#
privateint currentPage; v8ap"9b
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/** the begin index of the records by the current J 6KHc^,7
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query */ <IZt]P
privateint beginIndex; 7.h{"xOx{
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/** The default constructor */ xG/Q%A
public Page(){ J{ju3jo
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} W'@|ob
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/** construct the page by everyPage bp?5GU&Uy
* @param everyPage X`D2w:
* */ h-P|O6@Ki
public Page(int everyPage){ V\Cl""`XN
this.everyPage = everyPage; 3s%?)z
} N[/<xW~x?4
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/** The whole constructor */ &zJI~R
public Page(boolean hasPrePage, boolean hasNextPage, P1mg;!tq
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int everyPage, int totalPage, W"Ip]LJ
int currentPage, int beginIndex){ >38>R0k35
this.hasPrePage = hasPrePage; |R9Lben',
this.hasNextPage = hasNextPage; ~*iF`T6
this.everyPage = everyPage; e#Cv*i_<
this.totalPage = totalPage; MLWHO$C~T
this.currentPage = currentPage; N1~bp?$1
this.beginIndex = beginIndex; y&$n[j
} #|b*l/t8
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/** t*(bF[?
* @return x4^nT=?6_
* Returns the beginIndex. D;Qx9^.
*/ D^6*Cwb
publicint getBeginIndex(){ XG/xMz~
return beginIndex; !vwio!
} ]UvB+M]Lv)
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/** z(\aJW
* @param beginIndex aoN\n]g
* The beginIndex to set. fUjo',<s
*/ fB$a)~
publicvoid setBeginIndex(int beginIndex){ E`fG9:6l]
this.beginIndex = beginIndex; )7
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} =?OU^u`C
@Go_5X(
/** juHL$SGC
* @return Ms!EK
* Returns the currentPage. ws0qwv#
*/ ?6:qAFw
publicint getCurrentPage(){ sq'm)g
return currentPage; kOQ)QX
} I0}.!
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/** lCU clD
* @param currentPage _w\9
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* The currentPage to set. 6 eSo.@*l
*/ CQWXLQED>
publicvoid setCurrentPage(int currentPage){ DsHF9Mn
this.currentPage = currentPage; gRY#pRT6d
} <<
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/** roS" q~GS,
* @return v,-Tk=qP
* Returns the everyPage. v?`R8
*/ Q#p)?:o/
publicint getEveryPage(){ *wTX
return everyPage; %>
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} |*{*tW C1
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/** F1yn@a "=J
* @param everyPage );0
* The everyPage to set.
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*/ _5p$#U`
publicvoid setEveryPage(int everyPage){ R
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this.everyPage = everyPage; %ztZ#h~g
} px;~20$e
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/** tyR?A>F4
* @return Ub3$ `
* Returns the hasNextPage. lM\dK)p21O
*/ oZ%uq78#[%
publicboolean getHasNextPage(){ &hWELZe0vv
return hasNextPage; b-&rMML
} iE'_x$i
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/** 2y!n c%
* @param hasNextPage Ij#mmj NW
* The hasNextPage to set. r)t[QoD1
*/ 6Ryc&z5
publicvoid setHasNextPage(boolean hasNextPage){ |ty&}'6C
this.hasNextPage = hasNextPage; )U\i7[k>
} ]ae(t`\l^
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/** XVs]Y'*x
* @return tb&?BCp
* Returns the hasPrePage. 9
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*/ s-CAo~,
publicboolean getHasPrePage(){ iWt%Boyi
return hasPrePage; [(n5-#1S
} Q,NnB{R
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/** XC3)#D#HGh
* @param hasPrePage o9xc$hX}
* The hasPrePage to set. j3sz"(
*/
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publicvoid setHasPrePage(boolean hasPrePage){ ,buX|
this.hasPrePage = hasPrePage; IUOf/mM5
} MD[hqshoh
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/** {7e(0QK
* @return Returns the totalPage. FS"Ja`>j~
* I=L["]
*/ 0ca0-vY
publicint getTotalPage(){ mlByE,S2E
return totalPage; $oW=N
} *B&P[n
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/** J`5VE$2M
* @param totalPage (U'n1s/X
* The totalPage to set. 12^uu)6Xm,
*/ <Y)14w%
publicvoid setTotalPage(int totalPage){ oywPPVxj
this.totalPage = totalPage; nFni1cCD
} &eV5#Ph
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} DGJ:#UE
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