Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 9m!! b{
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ]p&< nK,
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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 +^ DRto=
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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 CQzjCRS
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分页支持类: )d(0Y<e@
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java代码: 4^[}]'w
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package com.javaeye.common.util; "bR'Bt
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import java.util.List; @?3vRs}h
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publicclass PaginationSupport { `e?;vA&
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publicfinalstaticint PAGESIZE = 30; <F)w=_%&
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privateint pageSize = PAGESIZE; ,.oa,sku
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privateList items; <DXmZ1
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privateint totalCount; u*26>.
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privateint[] indexes = newint[0]; <+\k&W&Y|y
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privateint startIndex = 0; ]PlY}VOY
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public PaginationSupport(List items, int }0BL0N`_
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totalCount){ $v:gBlj%"
setPageSize(PAGESIZE); "J P{Q
setTotalCount(totalCount); (F,(]71Z+
setItems(items); d<^_w!4X}
setStartIndex(0); {5QosC+o6Q
} qSEB}1
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public PaginationSupport(List items, int DYo<5^0
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totalCount, int startIndex){ h4XcKv+
setPageSize(PAGESIZE); C~ZE95g
setTotalCount(totalCount); ?eL='>Ne
setItems(items); ;Ze"<U
setStartIndex(startIndex); |.b%rVu
} m x3}m?WQ
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public PaginationSupport(List items, int Job/@> ;
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totalCount, int pageSize, int startIndex){ fDU+3b
setPageSize(pageSize); <\, &:<
setTotalCount(totalCount); \R8 6;9ov
setItems(items); h'B9|Cm
setStartIndex(startIndex); <K.Bq]
} kU#:I9PO
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publicList getItems(){ tCZpfZ@+=
return items; T$H2'tK|
} pNp^q/-yB
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publicvoid setItems(List items){ yDd=&
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this.items = items; Sdgb#?MR|
} 5Xwk*@t2a
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publicint getPageSize(){ xe(MHNrj
return pageSize; HS{P?~:=U
} ,q8(]n4
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publicvoid setPageSize(int pageSize){ "YuZ fL`bb
this.pageSize = pageSize; :tKbz
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} 7k3p'FeS
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publicint getTotalCount(){ EtGH\?d~]
return totalCount; > P(eW7RL
} 3nwz<P
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publicvoid setTotalCount(int totalCount){ 0HjJaML
if(totalCount > 0){ M6\7FP6G
this.totalCount = totalCount; /[0F6
int count = totalCount / F\JLbY{x]
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pageSize; Q5g,7ac8L
if(totalCount % pageSize > 0) pNuqT*
count++; 9KXym }
indexes = newint[count]; -zprNQW
for(int i = 0; i < count; i++){ ?F1wh2oq
indexes = pageSize * #`vVgGZ&
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i; 0"TgLd
} THJ
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}else{ mIRAS"Q!m
this.totalCount = 0; $cq!RgRn
} Q]/B/
} Hv3W{|
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publicint[] getIndexes(){ am2a#4`
return indexes; O5O.><RP
} W;.{]x.0
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publicvoid setIndexes(int[] indexes){ `6P?G|'
this.indexes = indexes; ~*,Wj?~+7
} +SyUWoM
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publicint getStartIndex(){ <iRWd
return startIndex; r4EoJyt
} <z',]hy
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publicvoid setStartIndex(int startIndex){ B_cgWJ*4
if(totalCount <= 0) @O'I)(To
this.startIndex = 0; ]9s\_A9
elseif(startIndex >= totalCount) Uh}+"h5
this.startIndex = indexes l**3%cTb
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[indexes.length - 1]; L$SMfx
elseif(startIndex < 0) 7u|%^Ao6
this.startIndex = 0; BR3wX4i\
else{ t?HF-zQ
this.startIndex = indexes ~~@y_e[N#l
1 )'Iu`k/
[startIndex / pageSize]; u(AA`S"
} %P;[fJ
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} js
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publicint getNextIndex(){ K_Re}\D
int nextIndex = getStartIndex() + lA]N04 d
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pageSize; -zdmr"CA
if(nextIndex >= totalCount) :Pf>Z? /d
return getStartIndex(); pjdo|
else n>S2}y
return nextIndex; 83Uw
} 50*@.!^*
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publicint getPreviousIndex(){ Fo(y7$33*
int previousIndex = getStartIndex() - 8+ hhdy*b
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pageSize; b Ob
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if(previousIndex < 0) >8(jW
return0; u-:MVEm
else F<gMUDB
return previousIndex; #N$9u"8C
} <%&_#<C)
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} %4/xH9
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抽象业务类 c$A@T~$
java代码: ^7^2D2[
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/** YXRjx.srf
* Created on 2005-7-12 0MrN:M2B
*/ =ajLa/m'
package com.javaeye.common.business; UKj`_a6
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import java.io.Serializable; cJ/4Gl
import java.util.List; sG1BNb_
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import org.hibernate.Criteria; Y;eoTJ
import org.hibernate.HibernateException; 5*+I
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import org.hibernate.Session; 32^#RlSu8
import org.hibernate.criterion.DetachedCriteria; +A\V )
import org.hibernate.criterion.Projections; .1{l[[= W
import U(Z!J6{c
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org.springframework.orm.hibernate3.HibernateCallback; P5P<"
import yW`e |!
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org.springframework.orm.hibernate3.support.HibernateDaoS IM]h*YV'
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upport; Vd<K4Tk
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import com.javaeye.common.util.PaginationSupport; Fs)
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public abstract class AbstractManager extends QoseS/
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HibernateDaoSupport { @ t|3gF$X
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privateboolean cacheQueries = false; ^vW$XRnt
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privateString queryCacheRegion; qy&\Xgn;GA
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publicvoid setCacheQueries(boolean B%mtp;) P
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cacheQueries){ %l;*I?0H
this.cacheQueries = cacheQueries; Q0WY$w1<
} dE GX3 -
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publicvoid setQueryCacheRegion(String 3(o7co-f
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queryCacheRegion){ MX?}?"y
this.queryCacheRegion = U3+A MVnB
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queryCacheRegion; SBz/VQ
} BCBU b
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publicvoid save(finalObject entity){ 7IQqN&J
getHibernateTemplate().save(entity); zWtj|%ts
} PF67z]<o
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publicvoid persist(finalObject entity){ {KsVK4\r
getHibernateTemplate().save(entity); 7JS#a=D#
} 5Xj|:qz<(
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publicvoid update(finalObject entity){ KX=/B=3~
getHibernateTemplate().update(entity); ET3,9+Gj
} H4 =IY
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publicvoid delete(finalObject entity){ RyE_|]I62u
getHibernateTemplate().delete(entity); wR(ttwxK3
} umryA{Ps
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publicObject load(finalClass entity, GBW 7Y
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finalSerializable id){ Lg b
return getHibernateTemplate().load v =>3"!*
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(entity, id); [d\#[l_
} tpE3|5dZF
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publicObject get(finalClass entity, CM"s9E8y
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finalSerializable id){ 4 #G3ew
return getHibernateTemplate().get WFXx70n
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(entity, id); . rRc
} L^&do98
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publicList findAll(finalClass entity){ J09ZK8
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return getHibernateTemplate().find("from 6mX: =Q
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" + entity.getName()); ^g\h]RD}
} V`U/'N-ay
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publicList findByNamedQuery(finalString ]D?oQ$q7
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namedQuery){ 2zwuvgiZ
return getHibernateTemplate Af$0 o=".
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().findByNamedQuery(namedQuery); =xl7vHn7
} )_WH#-}
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publicList findByNamedQuery(finalString query, zv>ZrFl*
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finalObject parameter){
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return getHibernateTemplate Ti /;|lP@
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().findByNamedQuery(query, parameter); _ak.G=
} !N@Yh"c
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publicList findByNamedQuery(finalString query, $eTv6B?m
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finalObject[] parameters){ hrUm}@d
return getHibernateTemplate PpI+@:p[
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().findByNamedQuery(query, parameters); b6
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} }mkA Hmu4
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publicList find(finalString query){ g9RzzE!
return getHibernateTemplate().find ;2+FgOj
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(query); vy>];!Cu
} _:/Cl9~
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publicList find(finalString query, finalObject `HMligT
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parameter){ E,"b*l.
return getHibernateTemplate().find LbLbJ{68
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(query, parameter); S}XB
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} [M,27
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public PaginationSupport findPageByCriteria BVwRPt
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(final DetachedCriteria detachedCriteria){ a,F8+
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return findPageByCriteria sYW1T @
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); dT*f-W
} qkZ5+2m
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public PaginationSupport findPageByCriteria s~IA},F,\
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(final DetachedCriteria detachedCriteria, finalint ;'Z,[ a
dd
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startIndex){ m,kvEQ3
return findPageByCriteria Z]1z*dv
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(detachedCriteria, PaginationSupport.PAGESIZE, \!' {-J
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startIndex); ^|a&%wxA
} 5Fl
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public PaginationSupport findPageByCriteria =_H*fhXS
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(final DetachedCriteria detachedCriteria, finalint Cx1Sh#9
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pageSize, qNuv?.7
finalint startIndex){ D3ZT''
return(PaginationSupport) dKN3ZCw*gF
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getHibernateTemplate().execute(new HibernateCallback(){ 9b=^"K
publicObject doInHibernate [XY:MUe
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(Session session)throws HibernateException { 5e~{7{
Criteria criteria = <}x|@u
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detachedCriteria.getExecutableCriteria(session); @Tm0T7C
int totalCount = %]= 'Uv^x
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((Integer) criteria.setProjection(Projections.rowCount #VMBn}
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()).uniqueResult()).intValue(); qT-nD}
criteria.setProjection d9e H}#OY
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(null); O.40^u~
List items = vng8{Mx90*
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criteria.setFirstResult(startIndex).setMaxResults /\Y%DpG$
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(pageSize).list(); V44sNi
PaginationSupport ps = .qU%SmQ^
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new PaginationSupport(items, totalCount, pageSize, :92a34
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startIndex); ]C:If h~
return ps; C?<XtIoB
} 8@C|exAD`
}, true); Jtk.v49Ad>
} EpS8,[w
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public List findAllByCriteria(final Q9'p3"yoE
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DetachedCriteria detachedCriteria){ ;cHI3V
return(List) getHibernateTemplate s$y#Ufz
!{ )AV/\D
().execute(new HibernateCallback(){ Bc@r*zb
publicObject doInHibernate 36Y[7m=
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(Session session)throws HibernateException { Ak-7}i
Criteria criteria = &^D@(m7>{K
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detachedCriteria.getExecutableCriteria(session); Z1lF[d,f;
return criteria.list(); ^{+:w:g
} ~acK$.#
}, true); `Q^Sm`R
} ]M"'qC3g
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public int getCountByCriteria(final .`#R%4Xl
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DetachedCriteria detachedCriteria){ g-gBg\y{v
Integer count = (Integer) zi[M{bm
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getHibernateTemplate().execute(new HibernateCallback(){ 4'b]2Mn3
publicObject doInHibernate i1Sc/
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(Session session)throws HibernateException { tBUQf*B
Criteria criteria = wz)9/bL
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detachedCriteria.getExecutableCriteria(session); la 7QN QW
return ryLNMh
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criteria.setProjection(Projections.rowCount = }lA|S
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()).uniqueResult(); 80>!qG
} <&Xq`i/(
}, true); n{WJ.Y*
return count.intValue(); ,]qX_`qF
} g}KZL-p4\m
} eakIK+-21y
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用户在web层构造查询条件detachedCriteria,和可选的 N,$o'\l
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 e/\_F+jyc
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PaginationSupport的实例ps。 4 Z)]Cq*3
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ps.getItems()得到已分页好的结果集 P9wDTZ
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ps.getIndexes()得到分页索引的数组 dig76D_[e
ps.getTotalCount()得到总结果数 !WnI`
ps.getStartIndex()当前分页索引 Mp=+*I[
ps.getNextIndex()下一页索引 [nD4\x+
ps.getPreviousIndex()上一页索引 tpK4 gjf
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 %L.+r!.
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 *JXJ
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一下代码重构了。 Pme?`YO$x
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我把原本我的做法也提供出来供大家讨论吧: &pz8vWCk
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首先,为了实现分页查询,我封装了一个Page类: M czWg
java代码: A[bxxQSP\H
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/*Created on 2005-4-14*/ jU$PO\UTk
package org.flyware.util.page; B"v=Fr[
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/** u'p J9>sC
* @author Joa %?jf.p*kY
* 3F1Z$d(
*/ ./'n2$^3
publicclass Page { gP@ni$n
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/** imply if the page has previous page */ S)%x22sqf
privateboolean hasPrePage; !w Bmf&=
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/** imply if the page has next page */ *&D=]fG
privateboolean hasNextPage;
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/** the number of every page */ |.A>0-']M
privateint everyPage; 85mQHZ8aR
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/** the total page number */ :y)'qv[
privateint totalPage; o[6hUX0tN
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/** the number of current page */ bBX~ZWw
privateint currentPage; "^H+A-R[
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/** the begin index of the records by the current xph60T
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query */ 5kF5`5+Vj
privateint beginIndex; 5h1j.t!
}W<L;yD
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/** The default constructor */ /Q!F/HY3ZS
public Page(){ Ogb_WO;)
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} /2:r}O
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/** construct the page by everyPage nTAsy0p]
* @param everyPage \ *2IU"R
* */ vXF\PMf
public Page(int everyPage){ md0=6<
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this.everyPage = everyPage; eZcm3=WV|
} Vr*t~M>
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/** The whole constructor */ 9YJb~tuZ73
public Page(boolean hasPrePage, boolean hasNextPage, ld
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int everyPage, int totalPage, sqw _c{9
int currentPage, int beginIndex){ "a: ;
this.hasPrePage = hasPrePage; `G'V9Xs(
this.hasNextPage = hasNextPage; 0pR04"`;
this.everyPage = everyPage; (:\hor%
this.totalPage = totalPage; (/Ubw4unI
this.currentPage = currentPage; yhIg)/?L
this.beginIndex = beginIndex; 5?b9[o+D
} qb_V
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/** ;[xDc>&("Q
* @return m[}$&i$(
* Returns the beginIndex. mK4a5H
*/ $OT:J
publicint getBeginIndex(){ 3!,%;Vz=
return beginIndex; )6(mf2&
} 4MM#\
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/** Pwq}
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* @param beginIndex GB+G1w
* The beginIndex to set. +LUL-d
*/ Xm*Dh#H
publicvoid setBeginIndex(int beginIndex){ WDZEnauE
this.beginIndex = beginIndex; L$b9|j7
} Bq!P.%6p4
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/** a%AU9?/q#
* @return -B_dE-l,
* Returns the currentPage. k@Hu0x
*/ p?}Rolk7
publicint getCurrentPage(){ _])1P?.
return currentPage; PY^Yx$t9
} u%|VmM>
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/** I[&!\Me[+w
* @param currentPage g~cWBr%>
* The currentPage to set. $/D@=Pkc
*/ mb&b