Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 9M{z@H/
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 | wuUH
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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 6'+;5 M!
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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 H|&[,&M>
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分页支持类: V4kt&61
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java代码: G*.}EoA
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package com.javaeye.common.util; M-Gl".*f
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import java.util.List; a(-
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publicclass PaginationSupport { _qwKFC
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publicfinalstaticint PAGESIZE = 30; /, T@/
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privateint pageSize = PAGESIZE; CC,f*I
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privateList items; jPDk~|
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privateint totalCount; R&vV!d
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privateint[] indexes = newint[0]; $;k2b4u
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privateint startIndex = 0; 6=aXz2.f
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public PaginationSupport(List items, int .+.'TY--
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totalCount){ 3EVAB0/$
setPageSize(PAGESIZE); Kw/7X[|'G
setTotalCount(totalCount); %}`zq8Q;
setItems(items); _MmSi4]yd
setStartIndex(0); 1:.I0x!
} ~uUN\qx52
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public PaginationSupport(List items, int XCP/e p
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totalCount, int startIndex){ Yg~$1b@
setPageSize(PAGESIZE); ZcQ@%XY3~
setTotalCount(totalCount); *)8!~Hs
setItems(items); 4?u<i=i
setStartIndex(startIndex); w4<n=k
} >Q-"-X1
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public PaginationSupport(List items, int Szb#:C
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totalCount, int pageSize, int startIndex){ grs~<n|o\
setPageSize(pageSize); IEP^u
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setTotalCount(totalCount); z P`&X:8
setItems(items); V_Xq&!HN[
setStartIndex(startIndex); ?l/$cO
} X+$IaLfCxD
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publicList getItems(){ #X`qkW.T<
return items; C1M @;
} .7`c(9<
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publicvoid setItems(List items){ yh'uH
this.items = items; kc:>[ {9
} Mr}K-C?ge
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publicint getPageSize(){ b"PRa|]
return pageSize; "3Lq/mJYnZ
} OMz_xm.UPi
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publicvoid setPageSize(int pageSize){ g.]S5(
this.pageSize = pageSize; U=vh_NHj
} G@=H='
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publicint getTotalCount(){ OH_ m ZA
return totalCount; 7lH.>n
} u|Tg*B
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publicvoid setTotalCount(int totalCount){ g~v>{F+u
if(totalCount > 0){ ,?KN;~t#vz
this.totalCount = totalCount; +>BD^[^^
int count = totalCount / MRb6O!$`C
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pageSize; Er !s\(h
if(totalCount % pageSize > 0) Rch?@O#J
count++; )1ct%rue
indexes = newint[count]; \-Ipa59U
for(int i = 0; i < count; i++){ H\^zp5/
indexes = pageSize * ~/R bYvyA
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} VQ(l=k:}2
}else{ J;#7dRW{
this.totalCount = 0; [IRWm N-
} ^)%TQ.
} 6xT"j)h
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publicint[] getIndexes(){ wyC1M
return indexes; ?rSm6V
} 6)#=@i`
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publicvoid setIndexes(int[] indexes){ 6b7SA,
this.indexes = indexes; CGCI3Z'
} Gi7p`F.
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publicint getStartIndex(){ S
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return startIndex; t`
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} 7:P+ S%ZL
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publicvoid setStartIndex(int startIndex){ u~7
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if(totalCount <= 0) ~Kll.
this.startIndex = 0; ) |Md"r_B
elseif(startIndex >= totalCount) =H)"t:xE
this.startIndex = indexes X0&[cyP!
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[indexes.length - 1]; fKQq]&~
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elseif(startIndex < 0) Q3P*&6wA
this.startIndex = 0; >u/ T`$
else{ <x O"
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this.startIndex = indexes D)){"Q!b
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[startIndex / pageSize]; E5`KUMZkq
} $9Pscu bM4
} gzd)7np B2
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publicint getNextIndex(){ ITr@;@}c]
int nextIndex = getStartIndex() + kr{eC/Q"
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pageSize; m)oGeD( !
if(nextIndex >= totalCount) G~FAChI8![
return getStartIndex(); sUTfY|<7|
else *-lw2M9V
return nextIndex; (I0QwB
} @q<F_'7is
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publicint getPreviousIndex(){ #z&@f
int previousIndex = getStartIndex() - ZMn~QU_5
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pageSize; rc ()Eo50
if(previousIndex < 0) IuN:*P
return0; U%T{~f
else _7P#?:h
return previousIndex; rFl6xM;F
} n[tES6u
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} 9S!
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抽象业务类 *fg|HH+i
java代码: BELxaV,
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/** 4!)=!sL;
* Created on 2005-7-12 2oFbS%OV
*/ o5`LLVif5y
package com.javaeye.common.business; = k7}[!T
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import java.io.Serializable; oJ`cefcWo
import java.util.List; G}ccf%
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import org.hibernate.Criteria; 6>R|B?I%
import org.hibernate.HibernateException; vzPuk|q3
import org.hibernate.Session; z(JDLd
import org.hibernate.criterion.DetachedCriteria; p0Ra`*f
import org.hibernate.criterion.Projections; 86HK4sES
import `S+B-I0
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org.springframework.orm.hibernate3.HibernateCallback; G.y~*5?#
import .!Qo+(
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org.springframework.orm.hibernate3.support.HibernateDaoS $Q'S8TU
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upport; ae-hQF&
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import com.javaeye.common.util.PaginationSupport; TF7~eyLg
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public abstract class AbstractManager extends R}J}Qb
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HibernateDaoSupport { v>oWk:iJP
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privateboolean cacheQueries = false; 9?L,DThQ
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privateString queryCacheRegion; /@`kM'1:
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publicvoid setCacheQueries(boolean Z@d(0 z
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cacheQueries){ C<u<:4^H
this.cacheQueries = cacheQueries; ObIL w
} w/UZ6fu
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publicvoid setQueryCacheRegion(String (// f"c]/
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queryCacheRegion){ 3sF^6<E
this.queryCacheRegion = hCFgZiH2
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queryCacheRegion; QnN cGH
} M#a1ev
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publicvoid save(finalObject entity){ s%xhT
getHibernateTemplate().save(entity);
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} 6L4<c+v_
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publicvoid persist(finalObject entity){ || 0n%"h>i
getHibernateTemplate().save(entity); .lE7v -e
} UD}#c:I
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publicvoid update(finalObject entity){ '#Pg:v_
getHibernateTemplate().update(entity); /.>8e%)
} {M&Vh]
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publicvoid delete(finalObject entity){ I/V lH:o
getHibernateTemplate().delete(entity); EnD}|9
} .{ +Obi
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publicObject load(finalClass entity, r< ~pSj
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finalSerializable id){ ZA {T0:
return getHibernateTemplate().load h =E)5&Z
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(entity, id); zC<k4[ .
} Lw_s'QNWR
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publicObject get(finalClass entity, qOM" ?av
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finalSerializable id){ oTLA&dy@
return getHibernateTemplate().get o{r<=X ysM
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(entity, id); #ssSs]zl
} *47',Qy
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publicList findAll(finalClass entity){ E=eK(t(8
return getHibernateTemplate().find("from q47:kB{d
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" + entity.getName()); ]~!?(d!J/
} ).l`N&_peM
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publicList findByNamedQuery(finalString '2X6>6`w
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namedQuery){ n4%ZR~9WH
return getHibernateTemplate $vjl-1x&
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().findByNamedQuery(namedQuery); S;L=W9=wby
} bpp{Z1/4
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publicList findByNamedQuery(finalString query, X" m0||
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finalObject parameter){ F(}~~EtPHo
return getHibernateTemplate ;:DDz
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().findByNamedQuery(query, parameter); OPe3p {]
} )oAx t70
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publicList findByNamedQuery(finalString query, R;l;;dC=
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finalObject[] parameters){ -'%>Fon
return getHibernateTemplate F)n^pT
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().findByNamedQuery(query, parameters); 0+dc
} J<;@RK,c_
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publicList find(finalString query){ ?_V&~?r
return getHibernateTemplate().find 1XXuFa&
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(query); [Zxv&$SQ
} 'L$}!H1y
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publicList find(finalString query, finalObject oqUF_kh
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parameter){ *l{GD1ZDk
return getHibernateTemplate().find }p|S3/G?$!
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(query, parameter); 0aM&+j\q}
} ^Iy'G44
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public PaginationSupport findPageByCriteria dn1Fwy.
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(final DetachedCriteria detachedCriteria){ ;Y9-0W
return findPageByCriteria 6m$lK%P{1
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); U]A JWC6
} .$"13"
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public PaginationSupport findPageByCriteria &,8F!)[9
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(final DetachedCriteria detachedCriteria, finalint ;1AXu/
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startIndex){ slTE.
return findPageByCriteria q/#pol
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(detachedCriteria, PaginationSupport.PAGESIZE, /nWBo l,
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startIndex); E*AI}:or;
} @s.civ!Yk
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public PaginationSupport findPageByCriteria 'zhv#&O
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(final DetachedCriteria detachedCriteria, finalint Rl{e<>O\^
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pageSize, xQ,My
finalint startIndex){ s3sPj2e{
return(PaginationSupport) /
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))
getHibernateTemplate().execute(new HibernateCallback(){ =n<Lbl(7
publicObject doInHibernate oH='\M%+
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(Session session)throws HibernateException { Ms
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Criteria criteria = u*=8s5Q[
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detachedCriteria.getExecutableCriteria(session); V|&->9"
int totalCount = Ji)Ys
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((Integer) criteria.setProjection(Projections.rowCount WCD)yTg:ES
> JC"YB
()).uniqueResult()).intValue(); ezb*tN!
criteria.setProjection Ao+6^z_
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(null); `a `>Mtl
List items = yV*jc`1
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criteria.setFirstResult(startIndex).setMaxResults 0^vz /y1c
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(pageSize).list(); @jCMQYR
PaginationSupport ps = %xrldn%
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new PaginationSupport(items, totalCount, pageSize, a<J<Oc!
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startIndex); 21O@yNpS$
return ps; V :/v
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} ,rV;T";r
}, true); }9kn;rb$g
} >n3ig~0d
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public List findAllByCriteria(final 2wu\.{6Zp
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DetachedCriteria detachedCriteria){ CG;+Z-"X
return(List) getHibernateTemplate g:Q:cSg<
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().execute(new HibernateCallback(){ 0V?7'Em
publicObject doInHibernate U1 `pY:P
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(Session session)throws HibernateException { *cZ7?
Criteria criteria = M@JW/~p'
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detachedCriteria.getExecutableCriteria(session); h$mGawvZ~
return criteria.list(); [dFe-2u ,$
} \l%##7DRp]
}, true); a6@k*9D>
} |8tKN"QG
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public int getCountByCriteria(final YYL3a=;`a
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DetachedCriteria detachedCriteria){ +IMt$}7[
Integer count = (Integer) ,`PYU[
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getHibernateTemplate().execute(new HibernateCallback(){ EeHghq
publicObject doInHibernate @Ko#nDEq
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(Session session)throws HibernateException { 39MOqVc
Criteria criteria = 5g.w"0MkY
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detachedCriteria.getExecutableCriteria(session); Kn1T2WSAg
return `6RccEm
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criteria.setProjection(Projections.rowCount X#Ob^E%J
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()).uniqueResult(); [kTckZv
} nch#DE82
}, true); f:t j
return count.intValue(); 6q8PLyIp
} r9*6=*J|
} YeVo=hYH@
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用户在web层构造查询条件detachedCriteria,和可选的 4 L
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 | #b/EA9
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PaginationSupport的实例ps。 sgnc$x"
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ps.getItems()得到已分页好的结果集 sy-#Eo#3
ps.getIndexes()得到分页索引的数组 )c?nh3D
ps.getTotalCount()得到总结果数 4;@L#Pzt
ps.getStartIndex()当前分页索引 Z
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ps.getNextIndex()下一页索引 <EdNF&S-
ps.getPreviousIndex()上一页索引 w+Gav4
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ktRGl>J
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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 GZHJ4|DK
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一下代码重构了。 aK]AhOG
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我把原本我的做法也提供出来供大家讨论吧: tK?XU9o
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首先,为了实现分页查询,我封装了一个Page类: pe>?m ^gz[
java代码: Jw>na _FJ
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/*Created on 2005-4-14*/ F\v~2/J5v
package org.flyware.util.page; =diGuIB
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/** K`j:F>b
* @author Joa $~j9{*]5
* IxG7eX!
*/ ]>ndFE6kl
publicclass Page { d c_2nF
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/** imply if the page has previous page */ ; xQhq*
privateboolean hasPrePage; nywC]T
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/** imply if the page has next page */ Dd,i^,4Gj
privateboolean hasNextPage; -1~o~yGE
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/** the number of every page */ Ino]::ZJ/
privateint everyPage; 6.$z!~8
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/** the total page number */ _ysakn
privateint totalPage; OF)*kiJ
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/** the number of current page */ 3xmPY.
privateint currentPage; `I4E':
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/** the begin index of the records by the current *cCj*Zr]
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query */ 'cAS>s"$}V
privateint beginIndex; ;j[:tt\k
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/** The default constructor */ ):nC%0V
public Page(){ (_+ux1h6^
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} R=$}uDFmW
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/** construct the page by everyPage e.#,9
* @param everyPage Z}Q/u^Z
* */ a;nYR5f
public Page(int everyPage){ WS?Y8~+{5
this.everyPage = everyPage; ?AQA>D#W
} ts("(zI1E
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/** The whole constructor */ 2$VSH&
public Page(boolean hasPrePage, boolean hasNextPage, feeHXKD|
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int everyPage, int totalPage, W7@Vma`
int currentPage, int beginIndex){ %`\Qtsape
this.hasPrePage = hasPrePage; ?^^TR/
this.hasNextPage = hasNextPage; uq7/G|
this.everyPage = everyPage; ^#K^W V
this.totalPage = totalPage; skTtGz8R[
this.currentPage = currentPage; .7:ecFKk
this.beginIndex = beginIndex; R9D2cu,{
} rusYNb1J
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/** j~>J?w9<O
* @return R6:m@
* Returns the beginIndex. JsMN_%y?
*/ }jU)s{>fb
publicint getBeginIndex(){ .cx9+;
return beginIndex; P"t Dq&
} Snp(&TD<<
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/** }<w9Jfr"X
* @param beginIndex %qqeL
* The beginIndex to set. tB4yj_ZF
*/ }w2Et
publicvoid setBeginIndex(int beginIndex){ D0MW~Y6{
this.beginIndex = beginIndex; 3H4T*&9;n
} >IA1 \?(
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/** Y?zo")
* @return <Lt"e8Z> x
* Returns the currentPage. rSm#/)4A
*/ gQ%mVJB{(
publicint getCurrentPage(){ 8DbP$Wwi
return currentPage; Ge=\IAj
} 'WBhW5@
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/** `0w!&
* @param currentPage BQeg-M
* The currentPage to set. ,JTyOBB<I
*/ "A5z!6T{
publicvoid setCurrentPage(int currentPage){ L'"c;FF02i
this.currentPage = currentPage; x&m(h1h
} #e[r0f?U
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/** E @Rb+8},"
* @return U!RIeC
* Returns the everyPage. a5d_= :S;
*/ TV0Y{x*~iH
publicint getEveryPage(){ TIaiJvo
return everyPage; n!lE|if
} [9Tnp]q
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/** 5LU7}v~/
* @param everyPage No+BS%F5
* The everyPage to set. dldS7Q
*/ nLPd]%78>
publicvoid setEveryPage(int everyPage){ 322-'S3<
this.everyPage = everyPage; w vI
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} 1!E}A!;
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/** Tn(uH17
* @return /+. m.TF
* Returns the hasNextPage. g:p`.KuB
*/ Gc5mR9pV
publicboolean getHasNextPage(){ v;}MHl
return hasNextPage; =*>.z@WQ
} 5Fq+^
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/** rg
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* @param hasNextPage {!wd5C@
* The hasNextPage to set. U7,.L
*/ `bn@;7`X
publicvoid setHasNextPage(boolean hasNextPage){ |%3>i"Y@AK
this.hasNextPage = hasNextPage; 4$ah~E>,t
} LfCgvq6/pO
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/** R mo'3
* @return 4<5*HpW
* Returns the hasPrePage. %rEP.T\i
*/ :`<MlX
publicboolean getHasPrePage(){ T8W^qrx.v
return hasPrePage; qDfhR`1k
} Z *v`kl
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/** TQ[J,
* @param hasPrePage _.EM])b
* The hasPrePage to set. pE0@m-p
*/ E>2AG3)
publicvoid setHasPrePage(boolean hasPrePage){ ?#nk}=;g8
this.hasPrePage = hasPrePage; ~*~aFf5
} %j{*`}
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/** XB:E<I'q!3
* @return Returns the totalPage. jxYze/I
* NpbZt;%t
*/ =vDDfPR
publicint getTotalPage(){ `}a-prT<f
return totalPage; `>lY$EBG@[
} wNNg"}&P
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/** ?/~Q9My
* @param totalPage 8k.#4}fP
* The totalPage to set. "tDB[?
*/ 1&Mpx!K*T
publicvoid setTotalPage(int totalPage){ 58`Dcx,yJ
this.totalPage = totalPage; %/_E8GE
} +vV?[e
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} fN9uSnu
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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 hxw6^EA
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个PageUtil,负责对Page对象进行构造: ;:Tb_4Hr
java代码: 8\PI1U
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/*Created on 2005-4-14*/ muhu`
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package org.flyware.util.page; -f?,%6(1
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import org.apache.commons.logging.Log; /NuO>kQa
import org.apache.commons.logging.LogFactory; k?
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/** Ksk[sf?J&
* @author Joa C0ORBp
* A+fXt`YNM
*/ %"|W
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publicclass PageUtil { sn'E}.uhXH
}"/>,
privatestaticfinal Log logger = LogFactory.getLog 0^F!-b^z
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(PageUtil.class); H#T&