Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 C/
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 >Zo-wYG
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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 QY6O(=
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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 #w;;D7{@m
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分页支持类: Y&:/~&'
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java代码: A]#_"fayo
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package com.javaeye.common.util; w~]}acP
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import java.util.List; Lg b
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publicclass PaginationSupport { 0S_Ra+e
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publicfinalstaticint PAGESIZE = 30; 3}yraX6r!
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privateint pageSize = PAGESIZE; bje'Oolc
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privateList items; Q6xgLx[
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privateint totalCount; X!m;uJZp
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privateint[] indexes = newint[0]; m8p4U-*j
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privateint startIndex = 0; {8_:4`YZ
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public PaginationSupport(List items, int ~;` fC|)
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totalCount){ =g1 D;
setPageSize(PAGESIZE); ^g\h]RD}
setTotalCount(totalCount); K:C+/O
setItems(items); :K?iNZqWN6
setStartIndex(0); ]D?oQ$q7
} qgh]@JJh
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public PaginationSupport(List items, int g}^4^88=a
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totalCount, int startIndex){ #xDDh`
setPageSize(PAGESIZE); A=y24m
setTotalCount(totalCount); [@jp9D
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setItems(items); WReYF+Uen
setStartIndex(startIndex); [sjrb?Xd
} u)wu=z8
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public PaginationSupport(List items, int 9
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totalCount, int pageSize, int startIndex){ HrM)jC<~
setPageSize(pageSize); \3,$YlG
setTotalCount(totalCount); &:IfhS
setItems(items); 9_I[o.q
setStartIndex(startIndex); HE8'N=0
} [J(@$Qix
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publicList getItems(){ `\4 RFr$
return items; nI((ki}v
} yL^M~lws
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publicvoid setItems(List items){ Y0R\u\b
this.items = items; 5M/%%Ox
} zzDNWPzsA
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publicint getPageSize(){ `Pz!SJ|
return pageSize; .2 N_?
} !07FsPI#{
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publicvoid setPageSize(int pageSize){ 7zz(#
this.pageSize = pageSize; 81%qM7v9H
} uaZ"x&oZ#
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publicint getTotalCount(){ qkZ5+2m
return totalCount; ,Yiq$Z{qQ
} .~V".tZV[
5,G<}cd
publicvoid setTotalCount(int totalCount){ ^"6D0!'N
if(totalCount > 0){ J%O[@jX1
this.totalCount = totalCount; z[$9B#P
int count = totalCount / <Bob#Tf
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pageSize; Y_aP:+
if(totalCount % pageSize > 0) <7sF<KD
count++; O #uaGziFf
indexes = newint[count]; l72ie
for(int i = 0; i < count; i++){ _z_3%N
indexes = pageSize * "=v J}
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i; p0:&7,+a,
} ;{F;e)${M
}else{ x"h)"Y[c5
this.totalCount = 0; @zVBn~=i
} iu:p&h
} ?6.KS
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publicint[] getIndexes(){ 6m;wO r
return indexes; +'YSpJ
} S|u1QGB
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publicvoid setIndexes(int[] indexes){ xVwi
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this.indexes = indexes; w!GU~0~3[
} *M**h-p2'
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publicint getStartIndex(){ "351s3ff
return startIndex; UdM5R
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} BzG!Rg|J
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publicvoid setStartIndex(int startIndex){ uBL~AC3>O
if(totalCount <= 0) uvK%d\d
this.startIndex = 0; X:} 5L>'
elseif(startIndex >= totalCount) _R!!4Hp<Q
this.startIndex = indexes BX)cV
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[indexes.length - 1]; ^Ihdq89 t
elseif(startIndex < 0) V44sNi
this.startIndex = 0; hcqmjqJ
else{ %+OPas8C
this.startIndex = indexes Pt)}HF|u
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[startIndex / pageSize]; [ QL<&:s&
} cE8 _keR~
} fB ,!|u
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publicint getNextIndex(){ :Tl6:=B
int nextIndex = getStartIndex() + sCf(h
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pageSize; }mS0{rxD4
if(nextIndex >= totalCount) 1X:whS5S
return getStartIndex(); A,CPR0g%
else
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return nextIndex; pUEok +
} W&re;?Z{ke
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publicint getPreviousIndex(){ $4~}_phi
int previousIndex = getStartIndex() - a_fW{;}[
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pageSize; o5G "J"vxe
if(previousIndex < 0) s$y#Ufz
return0; /v ;Kb|e
else a0W\?
return previousIndex; arH\QPaka'
} J,M5<s[Xqt
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} o%JIJ7M
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抽象业务类 .nY6[2am
java代码: g4qdm{BL
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/** YaZ"&i
* Created on 2005-7-12 &-)Y[#\J
*/ r0uXMr=Z96
package com.javaeye.common.business; f?I *`~k
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import java.io.Serializable; ^{+:w:g
import java.util.List; ~ai'
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import org.hibernate.Criteria; I\6<)2j/L
import org.hibernate.HibernateException; DT]p14@t9
import org.hibernate.Session; *xVAm7_v
import org.hibernate.criterion.DetachedCriteria; 6zZR:ej
import org.hibernate.criterion.Projections; SpiC0
import *K^O oS
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org.springframework.orm.hibernate3.HibernateCallback; }? '9L:
import S&)
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org.springframework.orm.hibernate3.support.HibernateDaoS * CGdfdxW
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upport; =9@yJ9c-
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import com.javaeye.common.util.PaginationSupport; &bgi0)>
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public abstract class AbstractManager extends O9&:(2'f
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HibernateDaoSupport { G")EE#W$}
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privateboolean cacheQueries = false; ?bDae%>.d,
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privateString queryCacheRegion; jz:c)C&/
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publicvoid setCacheQueries(boolean 8J U~Q
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cacheQueries){ RYaofW
this.cacheQueries = cacheQueries; ]7
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} ~,-O
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publicvoid setQueryCacheRegion(String )#Bfd(F
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queryCacheRegion){ ,w>?N\w!}
this.queryCacheRegion = JLn<,Gn)<\
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queryCacheRegion; *9wHH-#
} U {!{5l:
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publicvoid save(finalObject entity){ ; O0rt1
getHibernateTemplate().save(entity); -RDs{c`y%N
} @&yj7-]
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publicvoid persist(finalObject entity){ _\;#a
getHibernateTemplate().save(entity); ?tQv|x
} rL"k-5>fd
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publicvoid update(finalObject entity){ @23x;x
getHibernateTemplate().update(entity); =6YO!B>7
} 3mz>Y*^?0
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publicvoid delete(finalObject entity){ l);8y5
getHibernateTemplate().delete(entity); Y\\nJuJo
} ') y~d
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publicObject load(finalClass entity, ~ riw7"
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finalSerializable id){ H;&t"Ql.
return getHibernateTemplate().load .w)t<7 y
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(entity, id); Z`t?kXDNoI
} 1=.kH[R
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publicObject get(finalClass entity, ZfikNQU9r
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finalSerializable id){ <Rt@z|Zv
return getHibernateTemplate().get _3[BS9
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(entity, id); Ma#-'J
} pjM|}i<'Q
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publicList findAll(finalClass entity){ :h~!#;w_
return getHibernateTemplate().find("from <2d@\"AoHE
Ij_`=w<
" + entity.getName()); h_!"CF<n
} gv-k}2u_
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publicList findByNamedQuery(finalString KIJ[ cIw
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namedQuery){ ;d40:q<
return getHibernateTemplate ro@BmRMW
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().findByNamedQuery(namedQuery); Z.JTq~`I
} KZNyp%q
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publicList findByNamedQuery(finalString query, s&</zU'
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finalObject parameter){ !o!04_
return getHibernateTemplate gs>cx]>
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().findByNamedQuery(query, parameter); (J*0/7
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} mNKa~E
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publicList findByNamedQuery(finalString query, ~]W8NaQB(
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finalObject[] parameters){ <
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return getHibernateTemplate iN*@f8gf
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().findByNamedQuery(query, parameters); bHnQLJ
} 1 Y&d%AA
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publicList find(finalString query){ Y~xZ{am
return getHibernateTemplate().find 2Oa-c|F
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(query); *93 N0m4Rl
} i\G3
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publicList find(finalString query, finalObject {9MYEN}FO
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parameter){ tS7u#YMh
return getHibernateTemplate().find 3F1Z$d(
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(query, parameter); ?Dm&A$r
} qfU3Cwy
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public PaginationSupport findPageByCriteria u@B"*V~K
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(final DetachedCriteria detachedCriteria){ lTXU
return findPageByCriteria pxj"<q`nw8
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); /slML~$t<
} 9@06]EI_
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public PaginationSupport findPageByCriteria ($kwlj~c
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(final DetachedCriteria detachedCriteria, finalint Y$^\D'.k
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startIndex){ <4g^c&
return findPageByCriteria S SXSgp
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(detachedCriteria, PaginationSupport.PAGESIZE, U?QO'H5
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startIndex); j*{bM{~T<
} cx|j
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public PaginationSupport findPageByCriteria G.}yNjL8
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(final DetachedCriteria detachedCriteria, finalint ?*4zNhL
"^H+A-R[
pageSize, zjmc>++<t
finalint startIndex){ xcig'4L
return(PaginationSupport) v6:DA#0
u#\3T>o%@
getHibernateTemplate().execute(new HibernateCallback(){ k$UBZ,=iC
publicObject doInHibernate DYS(ZY)4
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(Session session)throws HibernateException { Tx5L
Criteria criteria = ect?9S[!y
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detachedCriteria.getExecutableCriteria(session); Z=|@76
int totalCount = ~#@EjQCq
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((Integer) criteria.setProjection(Projections.rowCount ZeO>Ag^
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()).uniqueResult()).intValue(); `4CRpz
criteria.setProjection <T wq{kt
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(null); >BX_Bou
List items = 5+UiAc$
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criteria.setFirstResult(startIndex).setMaxResults vl<J-+|0C
7XNfH@
(pageSize).list(); "hfwj`U
PaginationSupport ps = I9E@2[=!
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new PaginationSupport(items, totalCount, pageSize, II91Ia
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startIndex); r!#3>F;B
return ps; H2]I__t/u
} NQG"}=KA
}, true); Lh}he:k+
} wb}tN7~Y;
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public List findAllByCriteria(final b%kh:NV{S
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DetachedCriteria detachedCriteria){ URAipLvN
return(List) getHibernateTemplate Xk2
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().execute(new HibernateCallback(){ PT;$@q8
publicObject doInHibernate EY>A(
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(Session session)throws HibernateException { 3 yElN.=
Criteria criteria = SCjACQ}-
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detachedCriteria.getExecutableCriteria(session); h2q]!01XP
return criteria.list(); 7-5q\[ZK
} {t7
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}, true); U|zW_dj
} )"1D-Bc\Q
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public int getCountByCriteria(final <ESAoY"RPN
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DetachedCriteria detachedCriteria){ .C#}g
Integer count = (Integer) lY 1m%
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getHibernateTemplate().execute(new HibernateCallback(){ gFKQm(0g2
publicObject doInHibernate =3"Nn4Z
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(Session session)throws HibernateException { 0`x<sjG\q
Criteria criteria = p])km%zB(
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detachedCriteria.getExecutableCriteria(session); xWD wg@ P
return ! yxb<
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criteria.setProjection(Projections.rowCount VHJr+BQ1K/
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()).uniqueResult(); lj[Bd >
} ?XHJCp;f
}, true); ';1
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return count.intValue(); 9Dpmp|
} toQn]MT
} Fc=8Qt^
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用户在web层构造查询条件detachedCriteria,和可选的 Yux7kD\c
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 )ow 3Bl8w
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PaginationSupport的实例ps。 cJqPcCq(wn
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ps.getItems()得到已分页好的结果集 }x%"Oq|2]x
ps.getIndexes()得到分页索引的数组 5[GX
ps.getTotalCount()得到总结果数 ^wX_@?aKtt
ps.getStartIndex()当前分页索引 r}vrE
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ps.getNextIndex()下一页索引 C6Kz6_DQZ
ps.getPreviousIndex()上一页索引 i P/I% D
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 0^.q5#A2
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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 :cOwTW?Fj
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一下代码重构了。 Vbwbc5m}
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我把原本我的做法也提供出来供大家讨论吧: "e_ED*
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首先,为了实现分页查询,我封装了一个Page类: N%^mR>.`
java代码: >CYg\vas!
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/*Created on 2005-4-14*/ /
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package org.flyware.util.page; BkIvoW_
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/** p<jHUG4?'
* @author Joa :}E*u^v K
* QJ$]~)w?H
*/ 2)U3/TNe
publicclass Page { jL2f74?1
A?_2@6Y^
/** imply if the page has previous page */ ~>C!l k
privateboolean hasPrePage; EmLPq!C
/1O6;'8He
/** imply if the page has next page */ +wQGC
privateboolean hasNextPage; ,x_g|J _Y
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/** the number of every page */ /a]+xL
privateint everyPage; 3 \kT#nr
yLI=&7/e@
/** the total page number */ d{YhKf#~
privateint totalPage; IQH;`+
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/** the number of current page */ ^P]: etld9
privateint currentPage; F`Pu$>8C
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/** the begin index of the records by the current @w2}WX>
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query */ Qi[T!1
privateint beginIndex; 'dBzv>ngD
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/** The default constructor */ IPJs$PtKok
public Page(){ EkJo.'0@
V,2O`D%
} }}ogdq
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/** construct the page by everyPage k5<lkC2z
* @param everyPage {VI%]n{M
* */ 5Lue.U%a
public Page(int everyPage){ !4
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this.everyPage = everyPage; :CH'Bt4<
} {Q4=GrS
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/** The whole constructor */ ^up*KQ3u\
public Page(boolean hasPrePage, boolean hasNextPage, N["(ZSS
:s8,i$Ex
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int everyPage, int totalPage, <nIU]}q
int currentPage, int beginIndex){ n)pBK>+
this.hasPrePage = hasPrePage; uZ
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this.hasNextPage = hasNextPage; pKp#4Js
this.everyPage = everyPage; L !{^^7
this.totalPage = totalPage; %S@XY3jZY
this.currentPage = currentPage; Ef7Kx49I
this.beginIndex = beginIndex; 654PW9{(
} Z3[,Xw
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/** %3FI>\3
* @return R4{}ZT
* Returns the beginIndex. /oWB7l&
*/ SqEO
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publicint getBeginIndex(){ 1f~_# EIC
return beginIndex; |Z!C`G[
} Oi7:J>
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/** v3`J~,V<
* @param beginIndex ;/ p)vR
* The beginIndex to set. bp5hS/A^1w
*/ mB_ba1r
publicvoid setBeginIndex(int beginIndex){ (A"oMnjWd
this.beginIndex = beginIndex; mb?yG:L=0b
} 40+E#z)
g,x$z~zU{
/** ox)/*c<
* @return Be?mIwc_g
* Returns the currentPage. V?5QpBKI
*/ \-`L}$
publicint getCurrentPage(){ Hm%[d;Z7
return currentPage; />)>~_-3
} fM
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Je+L8TB
/** cb|`)"<HN
* @param currentPage "fS9Nx3
* The currentPage to set. 6'|J
;
*/ ';zLh
publicvoid setCurrentPage(int currentPage){ g)xzy^2e
this.currentPage = currentPage; u;1#eP\;
} _/P"ulNb
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/** GsE?<3
* @return F_\\n#bv
* Returns the everyPage. st/Tb/
*/ g 9>p?XY
publicint getEveryPage(){ &> }MoB
return everyPage; W $H8[G
} =@w};e#D
A3!NEFBK
/** 1QjrL@$>15
* @param everyPage CDoZv""
* The everyPage to set. s13Iu#
*/ //K]zu
publicvoid setEveryPage(int everyPage){ E(8O3*=
this.everyPage = everyPage; ,&z_ 2m
} [sACPn$f
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/** %+xh
* @return lT1*e(I
* Returns the hasNextPage. \#G`$JD
*/ L$lo5
publicboolean getHasNextPage(){ zVkHDT[
return hasNextPage; C
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} x/bO;9E%U4
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/** q'",70"\
* @param hasNextPage ax'Dp{Q
* The hasNextPage to set. &{ntx~Eq
*/ r{p?aG
publicvoid setHasNextPage(boolean hasNextPage){ JFR,QUT
this.hasNextPage = hasNextPage; |VaXOdD`&
} ''v_8sv
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/** [<8<+lH=P
* @return :m@(S6T m
* Returns the hasPrePage. gHYYxhW$
*/ C0KP,JS&
publicboolean getHasPrePage(){ ^9qncvV
return hasPrePage; sN^R Z0!>
} mbJ#-^}V
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/**
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* @param hasPrePage gLd3,$Ei
* The hasPrePage to set. "4n_MV>p
*/ y4P mL
publicvoid setHasPrePage(boolean hasPrePage){ ?Za1
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this.hasPrePage = hasPrePage; V..m2nQj
} E83{4A4
?}B_'NZ%
/** (fY (-
* @return Returns the totalPage. ~;Xdz/
* wzP>Cq
*/ =GFlaGD
publicint getTotalPage(){ 0dXZd2oK@
return totalPage; 1mf|:2,
} J}%&;uv
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/** iMJ jWkk
* @param totalPage Q4_j`q
* The totalPage to set. M)Ogb'@#
*/ Tw-gM-m;
publicvoid setTotalPage(int totalPage){ {@B<$g
this.totalPage = totalPage; 9J0m
} U*[/F)!
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} A5Y z|
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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 b~%(5r.
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个PageUtil,负责对Page对象进行构造: =#n|t[h-
java代码: oy#Qj3M8=
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/*Created on 2005-4-14*/ }3=]1jH6
package org.flyware.util.page; ?
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import org.apache.commons.logging.Log; 5A:b
\
import org.apache.commons.logging.LogFactory; XQHvs{Po
k +&LOb7
/**
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* @author Joa ?uOdqMJV
* /nGsl<
*/ (A/V(.!
publicclass PageUtil { I>b!4?h
<gQw4
privatestaticfinal Log logger = LogFactory.getLog gKn"e|A
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(PageUtil.class); qL
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()=
/** W32bBzhL
* Use the origin page to create a new page W?5^cEF
* @param page ;r"YZs&Xd
* @param totalRecords -:AknQq
* @return V!a\:%#^Y
*/ _l{GHz
publicstatic Page createPage(Page page, int kd9hz-*
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totalRecords){ Mw*R~OX
return createPage(page.getEveryPage(), x.xfMM2n
)&;?|X+p
page.getCurrentPage(), totalRecords); W;eHDQ|
} b*+Od8r
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/** PmZ-H>
* the basic page utils not including exception -R?~Yysd7K
"7(2m
handler n,!PyJ
* @param everyPage !ZlBM{C
* @param currentPage [\+"<;m$
* @param totalRecords z !2-U
* @return page 0*G
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*/ c4H5[LPF
publicstatic Page createPage(int everyPage, int b'F#Y9
7:iTx;,v
currentPage, int totalRecords){ 9HJrMX
everyPage = getEveryPage(everyPage); P|c[EUT
currentPage = getCurrentPage(currentPage); 5A^$!q P
int beginIndex = getBeginIndex(everyPage, !Q(x A,p
-!w({rP
currentPage); b7;`A~{9v
int totalPage = getTotalPage(everyPage, zb<YYJ]
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totalRecords); }_,1i3Rip
boolean hasNextPage = hasNextPage(currentPage, nKxu8YAJe
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totalPage);
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