Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 @w%{yzr%
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 )L)jvCw,e
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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 4x`.nql
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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 r )EuH.z
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分页支持类: sPu@t&$
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java代码: gc
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package com.javaeye.common.util; sQ4~oZZ
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import java.util.List; 9kpCn.rJ
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publicclass PaginationSupport { 6N6}3J5
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publicfinalstaticint PAGESIZE = 30; 4
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privateint pageSize = PAGESIZE; ^Yz.}a##w2
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privateList items; u_;&+o2
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privateint totalCount; /2<1/[#
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privateint[] indexes = newint[0]; ,KfBG<3
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privateint startIndex = 0; -Um|:[*I
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public PaginationSupport(List items, int <b5J"i&m
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totalCount){ \Y>!vh X
setPageSize(PAGESIZE); gbC!>LV
setTotalCount(totalCount); H{XD>q.
setItems(items); D^G5$hi
setStartIndex(0); l6[0i
} NoR=:Q 9e
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public PaginationSupport(List items, int {J?#KHF'|
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totalCount, int startIndex){ 3U_,4qf
setPageSize(PAGESIZE); !oJ226>WI
setTotalCount(totalCount); i uNBw]
setItems(items); kVH^(Pi
setStartIndex(startIndex); 6v]y\+
} 5bfd8C
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public PaginationSupport(List items, int ]]InD N
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totalCount, int pageSize, int startIndex){ Tej&1'G
setPageSize(pageSize); TB8a#bK4
setTotalCount(totalCount); EYsf<8cl
setItems(items); ZeL v!
setStartIndex(startIndex); ;&A%"8o
} N9[2k.oBH
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publicList getItems(){ _:0)uR LS
return items; _6"YWR
} &ND8^lR=Y;
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publicvoid setItems(List items){ T VuDK
this.items = items; -9L[eYn
} r
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publicint getPageSize(){ .;:jGe(
return pageSize; I1TzPe
} '(qVA>S
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publicvoid setPageSize(int pageSize){ xpzQ"'be
this.pageSize = pageSize; W l4T}j
} _i-(`5
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publicint getTotalCount(){ 7wm9S4+|
return totalCount; qM|-2Zl!+
} HoFFce7o
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publicvoid setTotalCount(int totalCount){ B F,rZZL
if(totalCount > 0){ 0D\b;ju<
this.totalCount = totalCount; :Hn*|+'
int count = totalCount / }EW@/; kC
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pageSize; rLy<3
if(totalCount % pageSize > 0) 7n_'2qY
count++; Gz>M`M`[4
indexes = newint[count]; @`hnp:
for(int i = 0; i < count; i++){ SvE|"
indexes = pageSize * <0,szw
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}
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}else{ bay7%[BLB
this.totalCount = 0; f\Fk+)e@
} :=<0Z1S
} e2onR~Cf
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publicint[] getIndexes(){ q*h1=H52
return indexes; :=0XT`iY
} @aA1=9-L
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publicvoid setIndexes(int[] indexes){ CQLh;W`Dc
this.indexes = indexes; XO=UKk+EK
} lF=l|.c
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publicint getStartIndex(){ 6L2Si4OGjG
return startIndex; vfh0aW-O
} K]b_JDEk
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publicvoid setStartIndex(int startIndex){ NWGSUUa
if(totalCount <= 0) /f:)I.FUm
this.startIndex = 0; ) ny,vcU]
elseif(startIndex >= totalCount) Tath9wlv6;
this.startIndex = indexes w'Kc#2
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[indexes.length - 1]; w84
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elseif(startIndex < 0) Mohy;#8Wk
this.startIndex = 0; e'
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else{ d^&F%)AT
this.startIndex = indexes $S"QyAH~-a
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[startIndex / pageSize]; UacGq,
} ATeXOe
} W[dMf!(
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publicint getNextIndex(){ ]wMp`}$b@L
int nextIndex = getStartIndex() + 4HG@moYn@
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pageSize; j'?^<4i
if(nextIndex >= totalCount) +!(W>4F
return getStartIndex(); `%2e?"OOJ
else rQncW~
return nextIndex; S+i .@N.^
} pvz*(u
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publicint getPreviousIndex(){ -V'`;zE6
int previousIndex = getStartIndex() - yqg&dq
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if(previousIndex < 0) ,sAN,?eG~
return0; [n`SXBi+n
else X9:(}=E
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return previousIndex; &wZ ggp
} I<w`+<o(
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} brQkVt_)EE
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抽象业务类 ;|2h&8yX(/
java代码: sP0pw]!
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/** C +-<
* Created on 2005-7-12 J,s)Fu\j@
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package com.javaeye.common.business; h_ ^,|@C"
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import java.io.Serializable; N*PF&MyB
import java.util.List; 67I6]3[Z
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import org.hibernate.Criteria; 6~b~[gA
import org.hibernate.HibernateException; )e)@_0
import org.hibernate.Session; K8dlECy
import org.hibernate.criterion.DetachedCriteria; ZCQ7xQD
import org.hibernate.criterion.Projections; CI+dIv>
import w8t,?dY
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org.springframework.orm.hibernate3.HibernateCallback; v-85`h
import ILUA'T=B0
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org.springframework.orm.hibernate3.support.HibernateDaoS q8:Z.<%8
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upport; 4#5w^
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import com.javaeye.common.util.PaginationSupport; UarU.~Uqi
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public abstract class AbstractManager extends p}KZ#"Q
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HibernateDaoSupport { bQ-5uFe~$B
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privateboolean cacheQueries = false; YyX/:1 sg>
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privateString queryCacheRegion; A9!gww
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publicvoid setCacheQueries(boolean yQ4]LyS
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cacheQueries){ r}i<cyL
this.cacheQueries = cacheQueries; 9l+`O0.@
} LxkToO{
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publicvoid setQueryCacheRegion(String 4BG6C'`%
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queryCacheRegion){ tb7Wr1$<
this.queryCacheRegion = #Zpp*S55
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queryCacheRegion; j380=?7
} SGW2'
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publicvoid save(finalObject entity){ Q5e ,[1
getHibernateTemplate().save(entity); %t0Fx
} R@``MC0
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publicvoid persist(finalObject entity){ rt%.IQdY
getHibernateTemplate().save(entity); *b?C%a9
} ?H7*? HV
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publicvoid update(finalObject entity){ oC>QJ(o,8
getHibernateTemplate().update(entity); =:aH2T*
} eL9RrSXz
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publicvoid delete(finalObject entity){ *=L3bBu?
getHibernateTemplate().delete(entity); E%\i NU!
} 0SV#M6`GX
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publicObject load(finalClass entity, 9+.0ZP?
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finalSerializable id){ SMaC{RPQ
return getHibernateTemplate().load GZ\;M6{oh
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(entity, id); buGW+TrWY
} FG7}MUu
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publicObject get(finalClass entity, ]]$s"F<
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finalSerializable id){ Q44Pg$jp
return getHibernateTemplate().get ks7g*; 3{@
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(entity, id); k,M%/AXd
} 693J?Yah[
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publicList findAll(finalClass entity){ $rDeI-)S
return getHibernateTemplate().find("from @D8c-`LC"*
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" + entity.getName()); S#qd#Zk|Y
} c&2ZjM
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}
publicList findByNamedQuery(finalString /hf}f=7kH
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namedQuery){ ^jb55X}
return getHibernateTemplate J_R54Y~vu
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().findByNamedQuery(namedQuery); S pDVD
} V'~]b~R
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publicList findByNamedQuery(finalString query, Mw@T!)(
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finalObject parameter){ _{&znXf>?6
return getHibernateTemplate _n_lO8mK
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().findByNamedQuery(query, parameter); QJp
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} 6}
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publicList findByNamedQuery(finalString query, }pj>BK>
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finalObject[] parameters){ ?U~C= F?K
return getHibernateTemplate 8Wid.o-U
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().findByNamedQuery(query, parameters); %(Sy XZ
} M(x5D;db/
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publicList find(finalString query){ -Ep cX!i
return getHibernateTemplate().find npg.*I/>
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(query); "JAYTatO7H
} /HgdTyR)
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publicList find(finalString query, finalObject 33|>u+
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parameter){ %TdZ_
return getHibernateTemplate().find MVz=:2)J2
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(query, parameter); %5RY Ea
} Bv
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public PaginationSupport findPageByCriteria |r 1\
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(final DetachedCriteria detachedCriteria){ Qn(e[
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return findPageByCriteria C_=! ( @`8
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ?1i>b->
} !Sfy'v.
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public PaginationSupport findPageByCriteria K>6#MI
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(final DetachedCriteria detachedCriteria, finalint esx<feP)\
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startIndex){ jI(~\`
return findPageByCriteria r9 'lFj
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(detachedCriteria, PaginationSupport.PAGESIZE, 4.7OX&L'G
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startIndex); (Mhj-0xf$
} Ev%4}GwO4
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public PaginationSupport findPageByCriteria FOgF'!K
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(final DetachedCriteria detachedCriteria, finalint 6Lz{/l8
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pageSize, dG}fpQ3&
finalint startIndex){ X{\>TOk
return(PaginationSupport) +[8s9{1{C
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getHibernateTemplate().execute(new HibernateCallback(){ 048BQ
publicObject doInHibernate v5i[jM8
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(Session session)throws HibernateException { )`yxJ;O@$
Criteria criteria = 9d^o2Yo
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detachedCriteria.getExecutableCriteria(session); Bu">)AnN
int totalCount = T!eeMsI
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((Integer) criteria.setProjection(Projections.rowCount 5c($3Pno=
q3JoU/Sf
()).uniqueResult()).intValue(); EC$wi|i
criteria.setProjection p}_bu@;.Z
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(null); JYOyz+wNd
List items = )Yz`
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criteria.setFirstResult(startIndex).setMaxResults yd[}?
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(pageSize).list(); lidzs<W-fW
PaginationSupport ps = RxU6.5N
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new PaginationSupport(items, totalCount, pageSize, _C~e(/=z
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startIndex); n?_!gqK
return ps; hL~@Ah5&t
} Ke,UwYG2~G
}, true); o)Kx:l +f
} \ F#mwl,>"
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public List findAllByCriteria(final =_I2ek
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DetachedCriteria detachedCriteria){ frbKi _1
return(List) getHibernateTemplate ZXljCiNn+\
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().execute(new HibernateCallback(){ j0^~="p%C
publicObject doInHibernate n(l!T
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(Session session)throws HibernateException { 1VL!0H
Criteria criteria = ~'KymarPU
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detachedCriteria.getExecutableCriteria(session); qEPvV
return criteria.list(); yjvzA|(YC
} 6 /gh_'&
}, true); p#hs8xz
} DxR__
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public int getCountByCriteria(final c-3AzB#[
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DetachedCriteria detachedCriteria){ 4\4onCzuT
Integer count = (Integer) =:n>yZ3T
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getHibernateTemplate().execute(new HibernateCallback(){ W_9-JM(r
publicObject doInHibernate vt<r_&+ pJ
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(Session session)throws HibernateException { U(3+*'8r,1
Criteria criteria = /+pbO-r W*
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detachedCriteria.getExecutableCriteria(session); dawe!w!
return vpcx 1t<
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criteria.setProjection(Projections.rowCount Wk"4mq
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()).uniqueResult(); -v.\CtpHv
} h
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}, true); 0b+OB pqN
return count.intValue(); J*$u
} )$Xd#bzD|
} A9\m.3jo
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用户在web层构造查询条件detachedCriteria,和可选的 /uS(Z-@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 r,X5@/
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PaginationSupport的实例ps。 -jnx0{/
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ps.getItems()得到已分页好的结果集 RX8$&z
ps.getIndexes()得到分页索引的数组 4V9DPBh
ps.getTotalCount()得到总结果数 WL$Ee=
ps.getStartIndex()当前分页索引 By(:%=.
ps.getNextIndex()下一页索引 a5ZU"6Hi
ps.getPreviousIndex()上一页索引 @-nCK Yj
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 6*cG>I.Z
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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 i*B@#;;F
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一下代码重构了。 ln%xp)t
|#8u:rguy
我把原本我的做法也提供出来供大家讨论吧: _Qg^>}]A1
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首先,为了实现分页查询,我封装了一个Page类: 0&T0Ls#4
java代码: 2-5AKm@K
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/*Created on 2005-4-14*/ lG12Su/
package org.flyware.util.page; _yY(&(]#
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/** .WM 0x{t/
* @author Joa x'kwk
* EM]~yn!+
*/ ?#?[6t
publicclass Page { wJ@8-H 8}
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/** imply if the page has previous page */ <ABN/nH
privateboolean hasPrePage; KD?~ hpg
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/** imply if the page has next page */ !]1X0wo\
privateboolean hasNextPage; %Z~,F?
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/** the number of every page */ Gc2sY 0
privateint everyPage;
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/** the total page number */ ~l"70\&
privateint totalPage; Cc*"cQe
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/** the number of current page */ 1];rW`Bw
privateint currentPage; ` W$
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/** the begin index of the records by the current $G/h-6+8
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query */ u4TU"r("A
privateint beginIndex; oT2h'gu")
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}R-eQT
/** The default constructor */ = !7k/n';
public Page(){ tu\;I{h=0
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} [.4R ,[U
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/** construct the page by everyPage !GI*R2<W
* @param everyPage *O-1zIlp
* */ ?95^&4Oh0
public Page(int everyPage){ _[;>V*?zp5
this.everyPage = everyPage; f`'? 2
} ry9%Y3
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/** The whole constructor */ >Ia{ZbQV
public Page(boolean hasPrePage, boolean hasNextPage, dr0<K[S_
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int everyPage, int totalPage, USfpCRj9
int currentPage, int beginIndex){ yO Ed8
this.hasPrePage = hasPrePage;
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this.hasNextPage = hasNextPage; ]la8MaZ<