Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Q2CGC+
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 R
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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 j{C~wy!J
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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 6IqPZ{g9K'
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分页支持类: AD;m[u7
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java代码: ,xwiJfG;
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package com.javaeye.common.util; | W@ ~mrO
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import java.util.List; GRc)3
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publicclass PaginationSupport { |
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publicfinalstaticint PAGESIZE = 30; m"L^tSD~
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privateint pageSize = PAGESIZE; >s<Bu' r
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privateList items; ximVh}'a
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privateint totalCount; 6AIqoX*p
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privateint[] indexes = newint[0]; EH".ki=e
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privateint startIndex = 0; B4 bB`r
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public PaginationSupport(List items, int bI.hG32
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totalCount){ 1_7p`Gxt[/
setPageSize(PAGESIZE); CG uuadNI
setTotalCount(totalCount); (
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setItems(items); SY9 5s
setStartIndex(0); 4{>r_^8
} OX,em Ti
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public PaginationSupport(List items, int #-%D(=&I
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totalCount, int startIndex){ uV|F3'jT
setPageSize(PAGESIZE); j6s j 2D
setTotalCount(totalCount); >QDyG8*
setItems(items); +wG
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setStartIndex(startIndex); f0eQq;D$K
} ,b^Y8_ltoT
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public PaginationSupport(List items, int 42e [OG-
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totalCount, int pageSize, int startIndex){ iK2f]h
setPageSize(pageSize); e'~Qe_
setTotalCount(totalCount); w#2apaz
setItems(items); N?3p,2
setStartIndex(startIndex); I!b"Rv=Nf-
} ke@OG! M /
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publicList getItems(){ {pQ8/Af!
return items; b73}|4v
} !pfpT\i]N:
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publicvoid setItems(List items){ T6SYXQd>.
this.items = items; ,1~B7Zd
} =H: N!!:
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publicint getPageSize(){ .`*;AT
return pageSize; 3Ch42<
} "z6p=B"?3
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publicvoid setPageSize(int pageSize){ W rT_7
this.pageSize = pageSize; n=f?Q=h\3
} bs}SFT L
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publicint getTotalCount(){ >q')%j
return totalCount; io"NqR#"v
} Za,o
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publicvoid setTotalCount(int totalCount){ A[4HD!9=
if(totalCount > 0){ AN,3[Sh
this.totalCount = totalCount; C(sz/x?11
int count = totalCount / gjiS+N[
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pageSize; sw$JY}Q8x
if(totalCount % pageSize > 0)
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count++; /2r&ga&
indexes = newint[count]; |Eu#mN
for(int i = 0; i < count; i++){ ;p,Kq5,l
indexes = pageSize * 6."|m+D
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} Y3V2}
}else{ i'ZnU55=
this.totalCount = 0; 0p,_?3nX
} ?+c-m+;wj
} E)'T;%
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publicint[] getIndexes(){ (e
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return indexes; rXrIGgeM
} .dc|?$XV
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publicvoid setIndexes(int[] indexes){ ju.`c->k"
this.indexes = indexes; x {Rj2~KC
} ? _[q{i{
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publicint getStartIndex(){ ?U:c\TA,m
return startIndex; @q|c|X:I
} gsIp y
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publicvoid setStartIndex(int startIndex){ Ngrj@_J
if(totalCount <= 0) S>[&]
this.startIndex = 0; W
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elseif(startIndex >= totalCount) |>JRJ"CFE
this.startIndex = indexes E0A[{UA
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[indexes.length - 1]; q)"yP\
elseif(startIndex < 0) M VE:JNm
this.startIndex = 0; gE23C*!'&:
else{ !4"$O@U4
this.startIndex = indexes L$]Y$yv
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[startIndex / pageSize]; {FNCC*=
} %zjyZ{=
} t4zKI~cO
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publicint getNextIndex(){ [L2N[vy;
int nextIndex = getStartIndex() + f 0/q{*
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pageSize; }o=s"0 a
if(nextIndex >= totalCount) 3|Y.+W
return getStartIndex(); UE/iq\a>
else oJc v D
return nextIndex; ?,r}@89pY
} Qj9'VI>&
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publicint getPreviousIndex(){ tv9 R$-cJ
int previousIndex = getStartIndex() -
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pageSize; #%/0a
if(previousIndex < 0) 'V4B{n7h
return0; qwuA[QkPi
else No'Th7=|S
return previousIndex; xy^z_`
} wA";N=i=
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} e1H2w?
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抽象业务类 uF@DJX}>
java代码: DbN_(mC
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/** 239gpf]}
* Created on 2005-7-12 d?[8VfAnh
*/ GS,}]c=
package com.javaeye.common.business; Ye\&_w"
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import java.io.Serializable; :W[d&e
import java.util.List; s&W^?eKr
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import org.hibernate.Criteria; 5Kkp1K$M
import org.hibernate.HibernateException; qc/)l~]?g{
import org.hibernate.Session; %Xl(wvd
import org.hibernate.criterion.DetachedCriteria; NHD`c)Q
import org.hibernate.criterion.Projections; WHR6/H
import 97^)B4
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org.springframework.orm.hibernate3.HibernateCallback; EE~DU;p;]
import AgJPtzs
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org.springframework.orm.hibernate3.support.HibernateDaoS 5"7lWX
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upport;
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import com.javaeye.common.util.PaginationSupport; 'Fa~l'G7X
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public abstract class AbstractManager extends TxmKmZ u
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HibernateDaoSupport { s,8g^aF4
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privateboolean cacheQueries = false; 'dd[=vzK
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privateString queryCacheRegion; n{z!L-x^b
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publicvoid setCacheQueries(boolean e8hwXz
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cacheQueries){ 9y*pn|A[F
this.cacheQueries = cacheQueries; cG4$)q;q
} wGx*Xy1n<
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publicvoid setQueryCacheRegion(String a(K^/BT
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queryCacheRegion){ oedLe9!
this.queryCacheRegion = e`t-:~'
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queryCacheRegion; w4;1 ('
} b^&nr[DC
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publicvoid save(finalObject entity){ +#7)'c
getHibernateTemplate().save(entity); T']G:jkb
} I:o.%5)
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publicvoid persist(finalObject entity){ l'#a2Pl
getHibernateTemplate().save(entity); )C#b83
} 1|H(q
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publicvoid update(finalObject entity){ Bpdx]5qfK
getHibernateTemplate().update(entity); !WQ S.&
} uzaDK
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publicvoid delete(finalObject entity){ !^(?C@TQ
getHibernateTemplate().delete(entity); S0p[Kt
} /\UFJ
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publicObject load(finalClass entity, 7Ezy-x2h
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finalSerializable id){ rL<a^/b/=
return getHibernateTemplate().load
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(entity, id); 76RFu@k
} {*t0WE&1t
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publicObject get(finalClass entity, 629#t`W\
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finalSerializable id){ y[I)hSD=
return getHibernateTemplate().get 6%fF6
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(entity, id); o_on/{qz
}
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publicList findAll(finalClass entity){ 4{Af 3N
return getHibernateTemplate().find("from qI5`:PH%n
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" + entity.getName()); &bT \4
} J(=io_\bO
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publicList findByNamedQuery(finalString H+F>#
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namedQuery){ \"?5CHz*
return getHibernateTemplate Z-rHYfa4
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().findByNamedQuery(namedQuery); ;TTH
} #^eXnhj 9
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publicList findByNamedQuery(finalString query, PNhxF C.
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finalObject parameter){ _/@u[dWeL
return getHibernateTemplate KBy*QA
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().findByNamedQuery(query, parameter); YuKg|<WO
} =p7eP
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publicList findByNamedQuery(finalString query, S_dM{.!Z(,
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finalObject[] parameters){ Mib<1ZM
return getHibernateTemplate {~+o+LV
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().findByNamedQuery(query, parameters); K%RjWX=H
} NX9K%J
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publicList find(finalString query){ xJ|_R,>.H
return getHibernateTemplate().find 0`%Ask
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(query); g]E>e v{`
} CH+mzy
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publicList find(finalString query, finalObject F%^)oQT+c
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parameter){ fH*1.0f]6
return getHibernateTemplate().find 9KGi%UIFvn
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(query, parameter); ]@9ZUtU,;N
} 0mi$_Ld+
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public PaginationSupport findPageByCriteria b_rHt
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(final DetachedCriteria detachedCriteria){ dxK3462
return findPageByCriteria P1I L]
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); w-wap
} /7jb&f
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public PaginationSupport findPageByCriteria II)
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(final DetachedCriteria detachedCriteria, finalint ^q)AO?_
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startIndex){ }`^DO
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return findPageByCriteria LMTz/M
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(detachedCriteria, PaginationSupport.PAGESIZE, d_aHUmI^"
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startIndex); } za"rU
} c=#V*<
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public PaginationSupport findPageByCriteria "1|\V.>>;
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(final DetachedCriteria detachedCriteria, finalint -0f,qNF
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pageSize, b>x03%
finalint startIndex){ R8C#DB
return(PaginationSupport) ()o[(Hx+ph
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getHibernateTemplate().execute(new HibernateCallback(){ gOLN7K-)
publicObject doInHibernate jU0E=;1
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(Session session)throws HibernateException { "^NsbA+
Criteria criteria = 4I!g?Moh
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detachedCriteria.getExecutableCriteria(session); ne9-
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int totalCount = G;Py%8
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((Integer) criteria.setProjection(Projections.rowCount _(:<l
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()).uniqueResult()).intValue(); WO!'("
criteria.setProjection iph}!3f
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(null); lFZl}x
List items = Q%!Dk0-)
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criteria.setFirstResult(startIndex).setMaxResults )];Bo.QA
*"Uf|
(pageSize).list(); L6Io u
PaginationSupport ps = $(+#$F<eo+
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new PaginationSupport(items, totalCount, pageSize, 4=qZ Z>[t
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startIndex); 6<mlx'
return ps; E4,
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} M2pFXU?]
}, true); Nk;ywC"e;
} C2C1 @=w
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public List findAllByCriteria(final ?Sr7c|a2
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DetachedCriteria detachedCriteria){ u\Y3h:@u
return(List) getHibernateTemplate H*HL:o-[
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().execute(new HibernateCallback(){ 6_g:2=6S
publicObject doInHibernate X.+|o@G
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(Session session)throws HibernateException { J#xZ.6)
Criteria criteria = 2{<o1x,Ym
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detachedCriteria.getExecutableCriteria(session); 7#(0GZN9h%
return criteria.list(); o[)*Y`xq<w
} 0Ua&_D"
}, true); *Gul|Lp$<I
} ]-;MY@
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public int getCountByCriteria(final >R}G
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DetachedCriteria detachedCriteria){ }#h`1 uV
Integer count = (Integer) #Q'#/\5
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getHibernateTemplate().execute(new HibernateCallback(){ L7]o^p{g}Q
publicObject doInHibernate +w/B3b
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(Session session)throws HibernateException { 2N{^V?:
Criteria criteria = 4W#DLip9
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detachedCriteria.getExecutableCriteria(session); RT|1M"?$
return .$fSWlM;
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criteria.setProjection(Projections.rowCount @FZbp
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()).uniqueResult(); ?j&ZzK'#^
} |A\o
}, true); C5g9Gg
return count.intValue(); !
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} $0k7W?tu
} lffw
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用户在web层构造查询条件detachedCriteria,和可选的 Q5lt[2Zyzd
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 [bw1!X3
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PaginationSupport的实例ps。 SlG^ H
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ps.getItems()得到已分页好的结果集 }Ogb|8
ps.getIndexes()得到分页索引的数组 P\WFm
ps.getTotalCount()得到总结果数 <HtGp6q
ps.getStartIndex()当前分页索引 yf7|/M
ps.getNextIndex()下一页索引 Mh{244|o[
ps.getPreviousIndex()上一页索引 _PcF/Gyk
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 tW
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 #m17cDL
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一下代码重构了。 A{e>7Z72
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我把原本我的做法也提供出来供大家讨论吧: Ot)S\s>
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首先,为了实现分页查询,我封装了一个Page类: Y'5(exW
java代码: KaX*) P
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/*Created on 2005-4-14*/ wqi0%Cu*
package org.flyware.util.page; 9g\;L:'
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/** plp-[eKcD
* @author Joa J.'%=q(Sb
* ANNVE},
*/ [:(/cKo
publicclass Page { ALV(fv$cD
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/** imply if the page has previous page */ &=MVX>[
privateboolean hasPrePage; N:+)6a
@%G?Nht]o
/** imply if the page has next page */ H>W8F2VT
privateboolean hasNextPage; fERO(o
MB7*AA;
/** the number of every page */ -Lu&bVt<>
privateint everyPage; R}cNhZC
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/** the total page number */ +*Z'oC BJ,
privateint totalPage; h!v<J
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/** the number of current page */ -7]j[{?w
privateint currentPage; YSB=nd_
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/** the begin index of the records by the current PZ`11#bbm
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query */ g8l6bh$}
privateint beginIndex; H%X F~tF:
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/** The default constructor */ ":vEWp+g
public Page(){ UfPHV%Wd
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} k|\M(Z*(P
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/** construct the page by everyPage wMj#.Jh
* @param everyPage ]ly" K!1,
* */ GGhk~H4OP
public Page(int everyPage){ i#hFpZ6u
this.everyPage = everyPage; f*B-aj#
} yi*EobP
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/** The whole constructor */ R^$|D)(
public Page(boolean hasPrePage, boolean hasNextPage, ;Xy=;Z.]i
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! xG*W6IT
int everyPage, int totalPage, \Dy|}LE
int currentPage, int beginIndex){ A+gS'DZ9C
this.hasPrePage = hasPrePage; -F[@)$L
this.hasNextPage = hasNextPage; QF\nf_X
this.everyPage = everyPage; Ei):\,Nv
this.totalPage = totalPage; |oke)w=gn
this.currentPage = currentPage; QxdC[t$Lp
this.beginIndex = beginIndex; B~N3k
} Qj;{Z*l%+
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/** BkGExz
* @return "I)zi]vk
* Returns the beginIndex. ,!b<SQ5M
*/ |5tZ*$nGa
publicint getBeginIndex(){ (or"5}\6-
return beginIndex; R6Ov
} TKv!wKI
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/** *$W&jfW
* @param beginIndex UUlz3"`
* The beginIndex to set. DegbjqZ#
*/ /De~K+w7o
publicvoid setBeginIndex(int beginIndex){ .=
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this.beginIndex = beginIndex; cO*g4VL"[
} N
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/** sHc-xnd
* @return (X,i,qK/
* Returns the currentPage. xBA"w:<
*/ #YYJ4^":k
publicint getCurrentPage(){ ~cCMLK em
return currentPage; @)uV Fw"\
} G:":CX"O(
5EcVW|(
/** UGI<V!
* @param currentPage w CB*v<*
* The currentPage to set. gK`w|kh`
*/ ,M;9|kE*
publicvoid setCurrentPage(int currentPage){ Vv}R
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this.currentPage = currentPage; LK~aLa5wG
} 8ROKfPj;z
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/** 5tQz!M
* @return ;_e9v,
* Returns the everyPage. JEp)8{.bW8
*/ n jWe^
publicint getEveryPage(){ o+A1-&qhN
return everyPage; 2CO/K_Q
} KU/r"lMNlU
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/** MhD'
* @param everyPage fw jo?
* The everyPage to set. p35=CX`T.
*/ 5'I+%66?h$
publicvoid setEveryPage(int everyPage){ hr
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this.everyPage = everyPage; _TOWqV^
} J8alqs7
+ U5Q/g
/** !%,7*F(
* @return jU j\<aW
* Returns the hasNextPage. P3&s<mh
*/ *9EwZwE_K
publicboolean getHasNextPage(){ Yt]`>C[|D
return hasNextPage; 2!J#XzR0W
} II=`=H{
7 H
/** y9 {7+]
* @param hasNextPage %Hbq3U30
* The hasNextPage to set. ~R
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*/ T+}|$/Tv
publicvoid setHasNextPage(boolean hasNextPage){ 'K ?h6?#
this.hasNextPage = hasNextPage; S)W xTE9
} RW. qw4
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/** tb+gCs'D
* @return (XO=W+<'
* Returns the hasPrePage. h9H z6
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*/ Yub}AuU`v
publicboolean getHasPrePage(){ Cdz&'en^
return hasPrePage; _Sr7b#)o
} iWf+wC|
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/** 3\XNOJH
* @param hasPrePage cmG27\c RO
* The hasPrePage to set. ;{sZDjev>
*/ x|~8?i$%
publicvoid setHasPrePage(boolean hasPrePage){ ]!B0= XP
this.hasPrePage = hasPrePage; Trv}YT.
} L@S\ rImw
4>jHS\jc
/** O2{["c
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* @return Returns the totalPage. SH?McBxS
* #Q8_:dPY
*/ f1 x&Fk
publicint getTotalPage(){ .5
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return totalPage; Z@0tZ^V{
} ,TQec:B
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/** 6!m#;8 4
* @param totalPage j 2ag
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* The totalPage to set. xaMDec V
*/ '? 5-
publicvoid setTotalPage(int totalPage){ ^5sA*%T4
this.totalPage = totalPage; PXMd=,}
} w.?4}'DK
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} ]].~/kC^3k
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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 Pao^>rj
> <YU'>%
个PageUtil,负责对Page对象进行构造: @|b-X? `
java代码: eP-|3$
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/*Created on 2005-4-14*/ )UKX\nD"0
package org.flyware.util.page; y8k8Hd1<f
7}X1A!1
import org.apache.commons.logging.Log; %10ONe}
import org.apache.commons.logging.LogFactory; }nd>SK4
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/** >@2<^&K`
* @author Joa {<,%_pJR
* r].n=455[
*/ ~7PD/dre
publicclass PageUtil { Z =+Z96
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privatestaticfinal Log logger = LogFactory.getLog 8fXiadP#
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(PageUtil.class); Y2r}W3F=
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/** h9)S&Sk{s
* Use the origin page to create a new page ybBmg'198
* @param page {18hzhs
* @param totalRecords tMxde+$y
* @return ZxF`i>/h
*/ ;4rhhh&