Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ;+iw?"
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 M>"J5yqR
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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 XoqmT/P
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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 0w<qj T^U
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分页支持类: g7nqe~`{
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java代码: GK-__Y.
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package com.javaeye.common.util; XZ!^kftyW
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import java.util.List; Af{K#R8!
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publicclass PaginationSupport { o
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publicfinalstaticint PAGESIZE = 30; 8ECBi(
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privateint pageSize = PAGESIZE; v05B7^1@_
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privateList items; cl3Dwrf?
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privateint totalCount; "=ogO/_Q"
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privateint[] indexes = newint[0]; e#jkp'
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privateint startIndex = 0; qD/X% `>Q
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public PaginationSupport(List items, int =hse2f
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totalCount){ Kx@;LRY#
setPageSize(PAGESIZE); r%DaBx!x8
setTotalCount(totalCount); cf
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setItems(items); x9{&rldC
setStartIndex(0); *)4`"D
} voAen&>!
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public PaginationSupport(List items, int ); <Le6
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totalCount, int startIndex){ Q N$Ac.F
setPageSize(PAGESIZE); o#ajBOJ
setTotalCount(totalCount); `tb@x ^
setItems(items); pJpTOq\h
setStartIndex(startIndex); yC<[LH
} %SSBXWP
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public PaginationSupport(List items, int @+`">a8},
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totalCount, int pageSize, int startIndex){ 6EeK5XLf,
setPageSize(pageSize); tQ >
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setTotalCount(totalCount); +f- E8q
setItems(items); Lj(y>{y
setStartIndex(startIndex); -<GSHckD
} 6*92I
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publicList getItems(){ "Yu';&
return items; +zup+=0e
} '7Aj0U(
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publicvoid setItems(List items){ uY~xHV_-
this.items = items; v%%;Cp73
} Wk"\aoX"E
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publicint getPageSize(){ OY>0qj
return pageSize; 'K0=FPB/@
} 4M4oI .
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publicvoid setPageSize(int pageSize){ V.k2t$@
this.pageSize = pageSize; XK 09x1r
} z8"(Yy7m
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publicint getTotalCount(){ \X?GzQkr
return totalCount; ^.f`6 6/
} $sX X6K),
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publicvoid setTotalCount(int totalCount){ "uthFE
if(totalCount > 0){ R#QcQx
this.totalCount = totalCount; :',Q6j( s
int count = totalCount / EFYyr f@
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pageSize; V9"?}cR/W;
if(totalCount % pageSize > 0) DE^ @b+6
count++; [sT}hYh+
indexes = newint[count]; N))G/m3
for(int i = 0; i < count; i++){ BVt)~HZ
indexes = pageSize * Q]u*Oels
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i; Qs^RhF\d
} ;1&7v
}else{ @6roW\'$
this.totalCount = 0; mP?~#RZ
} ~e)`D nJ
} h 'F\9t
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publicint[] getIndexes(){ r^$4]@Wn
return indexes; }8W5m(Zq9n
} u{-J?t&`
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publicvoid setIndexes(int[] indexes){ xfE:r:
this.indexes = indexes; ^j1WF[GiSO
} *k]izWsV*
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publicint getStartIndex(){ e"sz jY~V
return startIndex; ;DkX"X+
} XA$Z7_gu3
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publicvoid setStartIndex(int startIndex){ A;4O,p@
if(totalCount <= 0) ^@&RJa-kb
this.startIndex = 0; &D|wc4+
elseif(startIndex >= totalCount) #hOAG_a,
this.startIndex = indexes t&r-;sH^[
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[indexes.length - 1]; E_aDkNT
elseif(startIndex < 0) nEZoF
this.startIndex = 0; q0oNRAvn"
else{ :d7tzYT ^
this.startIndex = indexes Qo!/n`19
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[startIndex / pageSize]; 5F8sigr/h
} d@:4se-q+
} ?W %9H\;
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publicint getNextIndex(){ PuuO2TZ
int nextIndex = getStartIndex() + IXmtjRv5
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pageSize; } #[MV+D
if(nextIndex >= totalCount) v$O%U[e<
return getStartIndex(); Btmv{'T_y@
else uKI2KWU?2
return nextIndex; 3MR4yw5v
} Hd1e9Q,:|
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publicint getPreviousIndex(){ #gw ys
int previousIndex = getStartIndex() - ^cE|o&Rm;
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pageSize; Bu ~N)^
if(previousIndex < 0) "g)@jqq:>
return0; 'NM$<<0
else F 8\nAX
return previousIndex; xZ*.@Pkr
} :E ISms
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} ;NrN#<j(!
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抽象业务类 K<HF!YU#I2
java代码: n\Z&sc
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/** HWFI6N
* Created on 2005-7-12 T@[(FVA N
*/ \($EYhx
package com.javaeye.common.business; ;%r#pv~
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import java.io.Serializable; >&0)d7Nu8m
import java.util.List; a'f0Wv0%"
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import org.hibernate.Criteria; 7l"N%e
import org.hibernate.HibernateException; U*G9 fpVy
import org.hibernate.Session; 2k,!P6fgl
import org.hibernate.criterion.DetachedCriteria; ,t4g^67R{
import org.hibernate.criterion.Projections; 5>J{JW|
import V+/Vk1
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org.springframework.orm.hibernate3.HibernateCallback; IS;F9{
import WlHw\\ur
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org.springframework.orm.hibernate3.support.HibernateDaoS V j\1HQ
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upport; gkdd#Nrk
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import com.javaeye.common.util.PaginationSupport; n>F1G
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public abstract class AbstractManager extends yM%,*VZ
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HibernateDaoSupport { bXoj/zek
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privateboolean cacheQueries = false; 41y}n{4n8
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privateString queryCacheRegion; ' bio:1
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publicvoid setCacheQueries(boolean OM!CP'u#{
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cacheQueries){ 8fzmCRFH
this.cacheQueries = cacheQueries; 8UArl3
} 0 r=:l/Pz
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publicvoid setQueryCacheRegion(String l^x5m]Kt
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queryCacheRegion){ /[YH
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this.queryCacheRegion = M9{?gM9
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queryCacheRegion; @; ayl
} 2F(zHa
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publicvoid save(finalObject entity){ ^ g`1SU`
getHibernateTemplate().save(entity); 7MreBs(M
} iivuH2/~?[
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publicvoid persist(finalObject entity){ mc_`:I=
getHibernateTemplate().save(entity); wXf_2qB9
} is`Eqcj`dr
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publicvoid update(finalObject entity){ CMa ~BOt #
getHibernateTemplate().update(entity); ^YzFEu$
} 6dO )]
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publicvoid delete(finalObject entity){ YK#bzu ,!
getHibernateTemplate().delete(entity); }?xu/C
} \?)@
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publicObject load(finalClass entity, HXF5fs
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finalSerializable id){ T'2(sHk
return getHibernateTemplate().load
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(entity, id); /)?]vKMiI
} B3uv>\
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publicObject get(finalClass entity,
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finalSerializable id){ eS9/-Y
return getHibernateTemplate().get HErTFY+vC
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(entity, id); ?}y?e}y*xZ
} {zhN>n_
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publicList findAll(finalClass entity){ uZ*;%y nQ
return getHibernateTemplate().find("from b8v?@s~
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" + entity.getName()); +9>t;
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} 2w93 ~j
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publicList findByNamedQuery(finalString R+IT)2
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namedQuery){ w$UWfL(
return getHibernateTemplate 4'bup h1(
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().findByNamedQuery(namedQuery); DOiL3i"H
} "Q;n-fqf
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publicList findByNamedQuery(finalString query, rmutw~nHD
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finalObject parameter){ EI6K0{'&X
return getHibernateTemplate ::N'tcZ^2
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().findByNamedQuery(query, parameter); 4Y8/>uL
} A?'Tigi
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publicList findByNamedQuery(finalString query, !]7r>NS>
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finalObject[] parameters){ mu0ER 3o
return getHibernateTemplate "<x%kD
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().findByNamedQuery(query, parameters); K"-.K]O8E%
} + |MHi C
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publicList find(finalString query){ 4M'y9 (
return getHibernateTemplate().find lpLjfHr
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(query); !},_,J~(|
} 0|n1O)>J
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publicList find(finalString query, finalObject 77"'?
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parameter){ E\&~S+:Xp
return getHibernateTemplate().find <[Ae0UK
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(query, parameter); J@w Q3#5a
} x;2tmof=L
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public PaginationSupport findPageByCriteria X*6bsYbK-
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(final DetachedCriteria detachedCriteria){ F
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return findPageByCriteria ZG>I[V'p=
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); VeidB!GyP
} cLn&b}8'
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public PaginationSupport findPageByCriteria
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(final DetachedCriteria detachedCriteria, finalint M \rW
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startIndex){ S*<+vIo
return findPageByCriteria 7<['4*u
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(detachedCriteria, PaginationSupport.PAGESIZE, nn!W-Bsqjh
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startIndex); ^%tmHDNL.
} :G\f(2@
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public PaginationSupport findPageByCriteria o_hk!s^4m
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(final DetachedCriteria detachedCriteria, finalint zsnXPRF
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pageSize, GF[onfQY7
finalint startIndex){ $
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return(PaginationSupport) X@JrfvKv[d
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getHibernateTemplate().execute(new HibernateCallback(){ /ghXI"ChI
publicObject doInHibernate + HvEiY
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(Session session)throws HibernateException { :=!?W^J
Criteria criteria = jy#'oadS?
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detachedCriteria.getExecutableCriteria(session); |9cJO@
int totalCount = bC{1LY0
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((Integer) criteria.setProjection(Projections.rowCount ak]:ir`o
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()).uniqueResult()).intValue(); f&x7g. I
criteria.setProjection CPGiKE
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(null); Fy_D[g
List items = kpFt
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criteria.setFirstResult(startIndex).setMaxResults R>1
q))rlMo
(pageSize).list(); ^ 'W<|
PaginationSupport ps = ]Q-*xho
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new PaginationSupport(items, totalCount, pageSize, $< &N#
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startIndex); i!5zHn
return ps; }cUq1r-bW
} wJ
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}, true); &|cg`m
} +zMWIG
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public List findAllByCriteria(final ~wtl\-cY
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DetachedCriteria detachedCriteria){ "SGq$3D
return(List) getHibernateTemplate );X&J:-l+
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().execute(new HibernateCallback(){ >9F&x>~
publicObject doInHibernate UbDRzum
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(Session session)throws HibernateException { <7-Qn(m,
Criteria criteria = B.)!zv\{
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detachedCriteria.getExecutableCriteria(session); w<}kY|A"=-
return criteria.list(); z^;0{q,
} 'vbrzI5m
}, true); Vu6$84>-,
} 2Fwp\I;
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public int getCountByCriteria(final O"%b@$p\L
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DetachedCriteria detachedCriteria){ xw[KP [(
Integer count = (Integer) 4}C^s\?z
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getHibernateTemplate().execute(new HibernateCallback(){ `v;9!ReZV
publicObject doInHibernate ,ddoII
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(Session session)throws HibernateException { !h\>[ O
Criteria criteria = 6k569c{7
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detachedCriteria.getExecutableCriteria(session); RRXnj#<g
return \9r1JP0
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criteria.setProjection(Projections.rowCount ANqWY&f
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()).uniqueResult(); :!',o]"4,k
} J3
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}, true); bA/,{R
return count.intValue(); kBF.TGT[l
} F@4TD]E0^
} G3Z>,"w;=
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用户在web层构造查询条件detachedCriteria,和可选的 _f^JXd,7v
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 no~Yet+<"
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PaginationSupport的实例ps。 Ev%_8CO4e
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ps.getItems()得到已分页好的结果集 {nr}C4]o
ps.getIndexes()得到分页索引的数组 [Un~]E.'J
ps.getTotalCount()得到总结果数 `B1r+uTP~
ps.getStartIndex()当前分页索引 |"gg2p
ps.getNextIndex()下一页索引 1u9*)w
ps.getPreviousIndex()上一页索引 gfr
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 v|]1x2191
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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 B\ <;e
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一下代码重构了。 vOF"p4 ^ 3
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我把原本我的做法也提供出来供大家讨论吧: a;GuFnfn,
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首先,为了实现分页查询,我封装了一个Page类: q3_ceXYU
java代码: e-@.+f2CC
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/*Created on 2005-4-14*/ _"4u?C#
package org.flyware.util.page; 3?n2/p
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/** R&vV!d
* @author Joa @Yu=65h
* <SPT2NyX
*/ b23 5Zm
publicclass Page { MS>QU@z7c
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/** imply if the page has previous page */ )XFaVkQ}
privateboolean hasPrePage; >>>&{>}!
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/** imply if the page has next page */ _ Vo35kA
privateboolean hasNextPage; .)Wqo7/Gx
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/** the number of every page */ EE,57(
privateint everyPage; Y!1x,"O'H
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/** the total page number */ QIWfGVc-
privateint totalPage; P2t9RCH
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/** the number of current page */ 9e _8Z@|
privateint currentPage; Qk)E:
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/** the begin index of the records by the current VZ1u/O?ub
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query */ cq0#~20
privateint beginIndex; +\yQZ{4'@
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/** The default constructor */ mh :eUFe
public Page(){ ^!j,d_)b!
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} R\MFh!6sn
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/** construct the page by everyPage $%"?0S
* @param everyPage 2t3DQ
* */ 8w\ZY>d
public Page(int everyPage){ *f*o
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this.everyPage = everyPage; \-nbV#{
} 1R"?X'w
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/** The whole constructor */ >J['so2Bf
public Page(boolean hasPrePage, boolean hasNextPage, @@pI>~#zh
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int everyPage, int totalPage, [:"7B&&A
int currentPage, int beginIndex){ S uo
this.hasPrePage = hasPrePage; XR@C^d
this.hasNextPage = hasNextPage; Wu|ANc
this.everyPage = everyPage; 6b7SA,
this.totalPage = totalPage; KwxO%/-}S
this.currentPage = currentPage; AD0pmD
this.beginIndex = beginIndex; cd3;uB4\,
} ZGgM-O1
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/** b!gvvg<
* @return g7g^iLU
* Returns the beginIndex. w\{oOlE
*/ 56l1&hp8In
publicint getBeginIndex(){ NzAMX+L
return beginIndex; VPI;{0kh
} Uf`~0=w
t`
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/** NB#-W4NA
* @param beginIndex u~7
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* The beginIndex to set. s F!nSr
*/ =H)"t:xE
publicvoid setBeginIndex(int beginIndex){ t{g7 :A
this.beginIndex = beginIndex; 7
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} *)82iD
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/** :J~sz)n4
* @return Y-y<gW
* Returns the currentPage. 9yWQ}h
*/ >j}.~$6dj_
publicint getCurrentPage(){ *)0-N!N#)
return currentPage; qrt2BT)
} rhQv,F9
d"~-D;
/** p)y'a+|7
* @param currentPage E@N& Y1t
* The currentPage to set. v#`7,::
*/ #z&@f
publicvoid setCurrentPage(int currentPage){ ['#3GJz-
this.currentPage = currentPage; 9%6W_0>
} QsC6\Gt#
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/** ^f_4w|u,+
* @return w\(;>e@
* Returns the everyPage. d%w#a3(
*/ iW$f1=i
publicint getEveryPage(){ p8_
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return everyPage; V^/]h
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} <o:|0=Swb
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/** 3V)NM%Aw
* @param everyPage jc-$l
* The everyPage to set. Yfjp:hg/!
*/ ON
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publicvoid setEveryPage(int everyPage){ p"k[ac{
this.everyPage = everyPage; ie9,ye"
} G.y~*5?#
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/** +x_9IvaW&?
* @return N&K`bmtD
* Returns the hasNextPage. 2uy<wJE>
*/ Tn"/EO^N
publicboolean getHasNextPage(){ LktH*ePO
return hasNextPage; >2[nTfS
} <V_P)b8$1
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/** ]UFbG40Zo
* @param hasNextPage QxS=W2iN
* The hasNextPage to set. Ir\f_>7
*/ \2huDNW&
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publicvoid setHasNextPage(boolean hasNextPage){ wOU\&u|
this.hasNextPage = hasNextPage; 9fQFsI
} }V I}O{
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/** M#a1ev
* @return IyJHKDFk
* Returns the hasPrePage. ~;uc@GGo
*/ B?pNF+?'z
publicboolean getHasPrePage(){ >jH%n(TcC
return hasPrePage; MeMSF8zSQ
} '#Pg:v_
'j27.Ry.
/** L^><APlX
* @param hasPrePage ,UE>@;]
* The hasPrePage to set. 5wgeA^HE2y
*/ ' En|-M5
publicvoid setHasPrePage(boolean hasPrePage){ <]e 0TU?bk
this.hasPrePage = hasPrePage; Ap)[;_9BD
} R m^$Dn
BfOQ/k))
/** oTLA&dy@
* @return Returns the totalPage. |b^+=
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* Tc.k0n%W:b
*/ @eOD+h'
publicint getTotalPage(){ :+*q,lX8
return totalPage; ]~!?(d!J/
} 14Y<-OO:
k
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/** #|R#/Yc@Bv
* @param totalPage K0xka[x=(
* The totalPage to set. 9?J
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*/ K}e:zR;;^
publicvoid setTotalPage(int totalPage){ X" m0||
this.totalPage = totalPage; *}<