Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Pfm*<,'x"[
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 B-$+UE>%
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 }bp.OV-+
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 5|CzX X#U
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分页支持类: Eevw*;$x
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java代码: L+73aN
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package com.javaeye.common.util; rxs8De
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import java.util.List; M=W
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publicclass PaginationSupport { =9(tsB gTX
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publicfinalstaticint PAGESIZE = 30; N^lAG"Jao[
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privateint pageSize = PAGESIZE; 4x(F&0
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privateList items; +SyUWoM
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privateint totalCount; )Xp Vu
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privateint[] indexes = newint[0]; G,B?&gFX
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privateint startIndex = 0; KhrFg1|
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public PaginationSupport(List items, int b )Tl*
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totalCount){ |e:rYLxm:
setPageSize(PAGESIZE); ly[lrD0Kn.
setTotalCount(totalCount); AO $Wy@
setItems(items); hl**zF
setStartIndex(0); 5\&]J7(
} 9l#gMFknI
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public PaginationSupport(List items, int $.9 +{mz
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totalCount, int startIndex){ l:)S 3
setPageSize(PAGESIZE); bfhz?,b
setTotalCount(totalCount); x df?nt
setItems(items); GoazH?%
setStartIndex(startIndex); "ct58Y@
} T~h.=5
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public PaginationSupport(List items, int }YRO'Q{
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totalCount, int pageSize, int startIndex){ j-QGOuvW
setPageSize(pageSize); lQWBCJ8y
setTotalCount(totalCount); u(AA`S"
setItems(items);
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setStartIndex(startIndex); cN5"i0xk
} wh*:\_!0\
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publicList getItems(){ bf(+ldq
return items; R1Yqz $#
} 94y9W#
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publicvoid setItems(List items){ K_Re}\D
this.items = items; q=+wI"[
} .'&V#D0
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publicint getPageSize(){ bLco:-G1E1
return pageSize; ??j&i6sp
} k/@Tr
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publicvoid setPageSize(int pageSize){ d+e0;!s~O
this.pageSize = pageSize; ni<[G0#T
} /e(W8aszi
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publicint getTotalCount(){ 50*@.!^*
return totalCount; 2eHx"Ha
} &}E:jt}
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publicvoid setTotalCount(int totalCount){ DLXL!-)z
if(totalCount > 0){ 8+ hhdy*b
this.totalCount = totalCount; ` .$&T7
int count = totalCount / 14-]esSa
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pageSize; h9jc,Xu5X
if(totalCount % pageSize > 0) ?9Ma^C;}
count++; E>"8/
indexes = newint[count]; ($'V&x8T
for(int i = 0; i < count; i++){ \FXp*FbQ
indexes = pageSize * ~?d>fR:X
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} B$j' /e-Zk
}else{ h;nQxmJ9
this.totalCount = 0; ^N{k6>;
} ,Y-S(
} [4: Yi{>
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publicint[] getIndexes(){ C99&L3bz^(
return indexes; %{"dP%|w4}
}
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publicvoid setIndexes(int[] indexes){ dXK-&Po'
this.indexes = indexes; ^7^2D2[
} j76%UG\Ga
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publicint getStartIndex(){ }/"4|U
return startIndex; %/!+(7
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} <]'|$8&jY
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publicvoid setStartIndex(int startIndex){ c 6q/X*
if(totalCount <= 0) "koo` J
this.startIndex = 0; z37Z%^
elseif(startIndex >= totalCount) -;/
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this.startIndex = indexes \%4|t,en
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[indexes.length - 1]; D J_DonO]
elseif(startIndex < 0) "k, K ~@}
this.startIndex = 0; A%n?}
else{ I)lC{v
this.startIndex = indexes NNp}|a9
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[startIndex / pageSize]; wASX\D }
} GFt1
} gyFr"9';c
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publicint getNextIndex(){ aj
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int nextIndex = getStartIndex() + tah}^
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pageSize; R;'?;I
if(nextIndex >= totalCount) )qd={
return getStartIndex(); CIy^`2wq
else C`EY5"N r
return nextIndex; GW8CaTf~
} 2LZS|fB9o
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publicint getPreviousIndex(){ gwq`_/d}
int previousIndex = getStartIndex() - D )gD<
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pageSize; HU9p!I.
if(previousIndex < 0) `x2,;h!:)N
return0; & g$rrpTzv
else >f%, `r
return previousIndex; JhH`uA&
} 3.FR C
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} 1daL y
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抽象业务类 63C(Tp"
java代码: GMe0;StT
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/** kC31$jMC3!
* Created on 2005-7-12 H:{?3gk.P3
*/ sZwZWD'
package com.javaeye.common.business; yKlU6t&`
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import java.io.Serializable; @(){/cF
import java.util.List; KC]tY9 FK
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import org.hibernate.Criteria; q0g1EJar
import org.hibernate.HibernateException; k}s+ca!B
import org.hibernate.Session; gs fhH0
import org.hibernate.criterion.DetachedCriteria; `@MPkCy1
import org.hibernate.criterion.Projections; T5q-"W6\
import r,"7%1I
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org.springframework.orm.hibernate3.HibernateCallback; K( z[}
import y+RRg[6|
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org.springframework.orm.hibernate3.support.HibernateDaoS xl9(ze
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upport; fyrd`R
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import com.javaeye.common.util.PaginationSupport; cd+^=esSO
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public abstract class AbstractManager extends -!~vA+jw1
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HibernateDaoSupport { b|6 !EGh
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privateboolean cacheQueries = false; C#h76fpH
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privateString queryCacheRegion; Pa[?L:E
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publicvoid setCacheQueries(boolean 1@@y]s_.a
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cacheQueries){ g&kH'fR8
this.cacheQueries = cacheQueries; SM$\;)L
} zuMO1s
@.1Qs`pt
publicvoid setQueryCacheRegion(String :Fnzi0b
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queryCacheRegion){ oSmjs
this.queryCacheRegion = Yw1Y-M
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queryCacheRegion; NA\ x<
} +[_gyLN<5b
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publicvoid save(finalObject entity){ $bFgsy*N2
getHibernateTemplate().save(entity); {Hr>X
} U&X.
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publicvoid persist(finalObject entity){ L\YZT|
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getHibernateTemplate().save(entity); %UBPoq
} jzQ I>u
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publicvoid update(finalObject entity){ XHZLWh"gS
getHibernateTemplate().update(entity); 8;0^'Qr8
} f}%sO
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publicvoid delete(finalObject entity){ 0f{IE@-b
getHibernateTemplate().delete(entity); C[g&F0 6
} X~%IM1+L;
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publicObject load(finalClass entity, RW)k_#%=
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finalSerializable id){ FbuKZp+
return getHibernateTemplate().load q 7`
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(entity, id); [d\#[l_
} E}t-N
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publicObject get(finalClass entity, y/H8+0sEk
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finalSerializable id){ [RW,{A
return getHibernateTemplate().get N4s$.`
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(entity, id); jWhD5k@v
} yG4 MUf6
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publicList findAll(finalClass entity){ <9T
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return getHibernateTemplate().find("from h ;jsH!
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" + entity.getName()); nE4l0[_
} N]*!8
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publicList findByNamedQuery(finalString h|)2'07
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namedQuery){ J09ZK8
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return getHibernateTemplate bnIf}ut-G
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().findByNamedQuery(namedQuery); 6B
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} 6mX: =Q
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publicList findByNamedQuery(finalString query, wH#Lb@cfZ0
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finalObject parameter){ L-SdQTx_
return getHibernateTemplate RR8U
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().findByNamedQuery(query, parameter); N:5b1TdI,
} 4U:DJ_GN
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publicList findByNamedQuery(finalString query, N
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finalObject[] parameters){ 9
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return getHibernateTemplate /]P%b K6B
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().findByNamedQuery(query, parameters);
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} Idt@Hk5<&
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publicList find(finalString query){ ]rKH|i
return getHibernateTemplate().find CdE2w?1
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(query); m21QN9(i%
} TZ)(ZKX*R
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publicList find(finalString query, finalObject f45x%tha %
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parameter){ }6F_2S3c
return getHibernateTemplate().find X*(gT1"t
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(query, parameter); lrM.RM96
} ^Jc$BMaVg
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public PaginationSupport findPageByCriteria HrM)jC<~
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(final DetachedCriteria detachedCriteria){ \nn56o@eN
return findPageByCriteria Z{Lmd`<w`j
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); f'8B[&@L
} Aigcq38
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public PaginationSupport findPageByCriteria }mkA Hmu4
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(final DetachedCriteria detachedCriteria, finalint Z:W')Nd(
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startIndex){ 56/.*qa
return findPageByCriteria ;2+FgOj
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(detachedCriteria, PaginationSupport.PAGESIZE, :5q^\xmmq
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startIndex); fq)Ohb
} mg/C Ux
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public PaginationSupport findPageByCriteria Nn~tb2\vk
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(final DetachedCriteria detachedCriteria, finalint x0N-[//YV
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pageSize, A?%XO
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finalint startIndex){ TW;|G'}$
return(PaginationSupport) *rujdQf
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getHibernateTemplate().execute(new HibernateCallback(){ I_R5\l}O+D
publicObject doInHibernate 7=9A_4G!
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(Session session)throws HibernateException { eWqVh[
Criteria criteria = 0jl:Yzo&\
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detachedCriteria.getExecutableCriteria(session); N?Z+zN&P
int totalCount = G~Q*:m
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((Integer) criteria.setProjection(Projections.rowCount "RR./e)h
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()).uniqueResult()).intValue(); *)}Ap4[
criteria.setProjection =N[V{2}q
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(null); k}+MvGq
List items = `"^@[1
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criteria.setFirstResult(startIndex).setMaxResults K{`2jK#
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(pageSize).list(); mYsuNTx!.
PaginationSupport ps = ,& \&::R
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new PaginationSupport(items, totalCount, pageSize, 8_sU8q*s
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startIndex); @5dBb+0J
return ps; &D&5UdN
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} P5ESrZ@f
}, true); VygXhh^7\
} [|m>vY!
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public List findAllByCriteria(final _mI:Lr#dT
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DetachedCriteria detachedCriteria){ (<AM+|
return(List) getHibernateTemplate `
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().execute(new HibernateCallback(){ *n$m;yI
publicObject doInHibernate i85+p2i7
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(Session session)throws HibernateException { Rzn 0-cG
Criteria criteria = F?+Uar|-a
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detachedCriteria.getExecutableCriteria(session); o+6^|RP
return criteria.list(); J T0,Z
} qNuv?.7
}, true); 2C
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} eL]w' }\
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public int getCountByCriteria(final 0
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DetachedCriteria detachedCriteria){ jT wM<?
Integer count = (Integer) L;(3u'
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getHibernateTemplate().execute(new HibernateCallback(){ e5:l 6`
publicObject doInHibernate =O}%bZ)Q
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(Session session)throws HibernateException { 'piF_5(@
Criteria criteria = B2Awdw3=g
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detachedCriteria.getExecutableCriteria(session); *Tlws
return )MX1776kU
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criteria.setProjection(Projections.rowCount %lqG* dRx0
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()).uniqueResult(); yU&g|MV_
} 5jCEy*%P@
}, true); RE*S7[ge
return count.intValue(); bQ:3G;
} OB? 79l
} q5K/+N^2?
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用户在web层构造查询条件detachedCriteria,和可选的 f^yLwRUD
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 O.40^u~
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PaginationSupport的实例ps。 ~?8x0
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ps.getItems()得到已分页好的结果集 W~@GK
ps.getIndexes()得到分页索引的数组
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ps.getTotalCount()得到总结果数 =w>>7u$4
ps.getStartIndex()当前分页索引 4@V <Suw
ps.getNextIndex()下一页索引 B#V4
ps.getPreviousIndex()上一页索引 )*QTxN
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 G QB^
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ~Sem_U`G
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一下代码重构了。 MAhPO!e5.
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我把原本我的做法也提供出来供大家讨论吧: cd%g]T)#1
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首先,为了实现分页查询,我封装了一个Page类: 5<GRi"7A@
java代码: )^'B:ic
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/*Created on 2005-4-14*/ a*wJcJTpV"
package org.flyware.util.page; 0dX=
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/** ';L^mxh
* @author Joa O=?X%m #
* ?Dp^dR
*/
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publicclass Page { /v ;Kb|e
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/** imply if the page has previous page */ )cmLo0`$
privateboolean hasPrePage; kp>Z /kt
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/** imply if the page has next page */ Q1&dB{L
privateboolean hasNextPage; B+H9c~3$
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/** the number of every page */ /WgW e
privateint everyPage; e ~,'|~
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/** the total page number */ &^D@(m7>{K
privateint totalPage; ~E|V{z%
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/** the number of current page */ EYD{8Fw-
privateint currentPage; g[+Q~/yq
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/** the begin index of the records by the current 7wEG<,D
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query */ 4g^+y.,r_f
privateint beginIndex; "}aM*(l+\
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/** The default constructor */ :\;uJ5
public Page(){ ->9xw
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} Nn7@+g)
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/** construct the page by everyPage A|OC?NZY
* @param everyPage b1^Yxe#L
* */ ^nZ2p$
public Page(int everyPage){ ~TR|Pv
this.everyPage = everyPage; zi[M{bm
} M{RZ-)IC
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/** The whole constructor */ q;~>h
public Page(boolean hasPrePage, boolean hasNextPage, +((31l
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int everyPage, int totalPage, ;<R_j%*
int currentPage, int beginIndex){ ~"0X,APR5
this.hasPrePage = hasPrePage; _%%"Y}
this.hasNextPage = hasNextPage; (>`SS#(T!
this.everyPage = everyPage; >^HTghgRD
this.totalPage = totalPage; w:+#,,rwzV
this.currentPage = currentPage; Bzt`9lg
this.beginIndex = beginIndex; E}j8p_p
} zFQkUgb
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/** ]H7Mx\
* @return /\I%)B47^9
* Returns the beginIndex. l#.,wOO{
*/ ;!sGfrs0$
publicint getBeginIndex(){
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return beginIndex; M.^A`
} `bF;Ew;
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/** &bK$!8Z
* @param beginIndex rM.<Gi05Qe
* The beginIndex to set. cHct|Z
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*/ *lF%8k"Al
publicvoid setBeginIndex(int beginIndex){ 3(p6ak2lv
this.beginIndex = beginIndex; Q8:ocEhR
} o_m.MMEU
x}j41E}
/** ^i1:PlW]
* @return dph6aN(49
* Returns the currentPage. *lO+^\HXD
*/ TBT*j&!L
publicint getCurrentPage(){ WfO$q^'?DP
return currentPage; CxQ,yd;>
} !\4FIs&Qv
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/** J :(\o=5 5
* @param currentPage FWN%JCOj@
* The currentPage to set. N\&;R$[9:
*/
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publicvoid setCurrentPage(int currentPage){ xhS/X3<th
this.currentPage = currentPage; E NjD~ S
} 2=+ ,jX{
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/** R?SHXJ%'
* @return cLP@0`^H
* Returns the everyPage. kn|l 3+
*/ U8z"{
publicint getEveryPage(){ X#<Sv>c^
return everyPage; p ivS8C
} 2oASz|
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/** k@U`?7X
* @param everyPage [nD4\x+
* The everyPage to set. XePBA
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*/ Jj:4@p:
publicvoid setEveryPage(int everyPage){ X
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this.everyPage = everyPage; Q6>( Z
} 5Vqvb|
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/** Jl ?Q}SB
* @return KL`>mJo$
* Returns the hasNextPage. v}D!
*/ *?&O8SSBH
publicboolean getHasNextPage(){ 0MPDD%TP
return hasNextPage; 0yNlf-O
} 0n=E.qZ9c
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/** yG4MqR)J
* @param hasNextPage JqZ5DjI:
* The hasNextPage to set. _"V0vV
*/ rd{(E
publicvoid setHasNextPage(boolean hasNextPage){ _AHVMsz@
this.hasNextPage = hasNextPage; X_l,fu^C#$
} )v0vdAh'b
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/** hBu=40K
* @return ;0gpS y$#
* Returns the hasPrePage. mo$*KNW%\
*/ k>`X!
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publicboolean getHasPrePage(){ &pz8vWCk
return hasPrePage; 4[q *7m
} JK`P
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/** {{,%p#/b
* @param hasPrePage 'h6RZKG T
* The hasPrePage to set. _: K\v8
*/ Efl+`6`J
publicvoid setHasPrePage(boolean hasPrePage){ a06DeRCej
this.hasPrePage = hasPrePage; _I!&w!3oM
} kpu^:N&
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/** i$bBN$<b<
* @return Returns the totalPage. H_FhHX.2(
* sTz*tSwQv
*/ Q<pM
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publicint getTotalPage(){ k~ue^^r}
return totalPage; %?jf.p*kY
} kz^G.5n
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/** !Ao?bs'
* @param totalPage lOui{QU
* The totalPage to set. yNL71 >w4
*/ +|;IIwo
publicvoid setTotalPage(int totalPage){ 4KnDXQ%
this.totalPage = totalPage; ,+&j/0U
} rpmDr7G
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} .$iIr:Tc>
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 f]}F_]
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个PageUtil,负责对Page对象进行构造: xo$ZPnf(zv
java代码: "K<