Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ( o(, ;
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 w)nFH)f
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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 Ci?BJ,
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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 w<qn @f
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分页支持类: -@I+IKz
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java代码: h?8I`Z)h
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package com.javaeye.common.util; z_;:6*l=:
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import java.util.List; .eNeqC
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publicclass PaginationSupport { t9U-c5bR
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publicfinalstaticint PAGESIZE = 30; ?o>JX.Nl&7
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privateint pageSize = PAGESIZE; [.
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privateList items; =ws iC'
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privateint totalCount; _l ,_NV&T
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privateint[] indexes = newint[0]; Ifx
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privateint startIndex = 0;
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public PaginationSupport(List items, int #;+ABV
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totalCount){ ]Yw/}GKB
setPageSize(PAGESIZE); p;x3gc;0
setTotalCount(totalCount); "sD[P3
setItems(items); (#)-IdXXO<
setStartIndex(0); ,E._A(Z
} \>G :mMk/
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public PaginationSupport(List items, int U!TSAg21P
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totalCount, int startIndex){ R(1N]>
setPageSize(PAGESIZE); rL KwuZ
setTotalCount(totalCount); *LZB.84
setItems(items); FD1Z}v!5IJ
setStartIndex(startIndex); =O.%)|
} H\PY\O&cP
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public PaginationSupport(List items, int -(;<Q_'s{"
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totalCount, int pageSize, int startIndex){ n N_Ylw
setPageSize(pageSize); -50Nd=1
setTotalCount(totalCount); g[%iVZ
setItems(items); N E/ _
setStartIndex(startIndex); y@'~fI!E4
} YCBcyE}p
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publicList getItems(){ te*|>NRS
return items; {L#+v~d^'n
} 4iPxtVT
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publicvoid setItems(List items){ w vnuE<o8
this.items = items; NDo>"in
} FSNzBN
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publicint getPageSize(){ tsWzM9Yf
return pageSize; 0]u=GD%
} %"gV>E_u
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publicvoid setPageSize(int pageSize){ o_#F,gze)S
this.pageSize = pageSize; +gh*n,:|
} vw'BKi
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publicint getTotalCount(){ M~O$,dof
return totalCount; +8zCol?j
} BXxl-x
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publicvoid setTotalCount(int totalCount){ )zMsKfQ
if(totalCount > 0){ cg|C S?
this.totalCount = totalCount; qN@-H6D1=
int count = totalCount / |EpL~G_
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pageSize; ;XDGlv%
if(totalCount % pageSize > 0) OGGuV Y
count++; 7.!`c-8
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indexes = newint[count]; fEYo<@5c]
for(int i = 0; i < count; i++){ 0,M1Q~u%.
indexes = pageSize * 8)m
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} &`}8Jz=S
}else{ T/YvCbo
this.totalCount = 0; IPxK$nI^
} \*r]v;NcP
} Y5XhV;16
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publicint[] getIndexes(){ G@+AB*Eu
return indexes; Lk8NjK6
} YYi:d=0<SO
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publicvoid setIndexes(int[] indexes){ us2RW<Oxv
this.indexes = indexes; 4/+P7.}ea-
} ?]Wg{\NC6
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publicint getStartIndex(){ /)LI1\o
return startIndex; x4e8;A(y
} 4)OM58e}
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publicvoid setStartIndex(int startIndex){ /t;Kn m
if(totalCount <= 0) >"%}x{|
this.startIndex = 0;
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elseif(startIndex >= totalCount) 8^U+P%
this.startIndex = indexes YgCSzW&(
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[indexes.length - 1]; 9?i~4&EY
elseif(startIndex < 0) ]fb3>HOTJ
this.startIndex = 0; W9A
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else{ v9S1<|jN
this.startIndex = indexes fo$Ac
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[startIndex / pageSize]; fd&=\~1_$
} ?T\_"G
} xZ.c@u6:
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publicint getNextIndex(){ G&f~A;'7k
int nextIndex = getStartIndex() + go[(N6hN
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pageSize; Vv<Tjr
if(nextIndex >= totalCount) hnp-x3
return getStartIndex(); =0gfGwD{
else j ?gscQ3
return nextIndex; Q4!6|%n8v
} vb1Gz]~)>
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publicint getPreviousIndex(){ \UR/tlw+/
int previousIndex = getStartIndex() - DAHQ7#qfQC
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pageSize; (;1Pgh
if(previousIndex < 0) $%5f
return0; GJB=5nE
else e/nc[
return previousIndex; :f|X$>
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} _5l3e7YN
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} %^VQw!
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抽象业务类 MDqUl:]
java代码: Qin;{8I0
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/** A=a~ [vre
* Created on 2005-7-12 -|\SNbPTV
*/ *M^t@ h l
package com.javaeye.common.business; 2ij/!
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import java.io.Serializable; DD(K@M
import java.util.List; .dStV6
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import org.hibernate.Criteria; WG\gf\= I
import org.hibernate.HibernateException; Wgr`)D
import org.hibernate.Session; 3.vQ~Fvl
import org.hibernate.criterion.DetachedCriteria; (}:n#|,{M
import org.hibernate.criterion.Projections; A;g{H|
import 3Hg}G#]WS
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org.springframework.orm.hibernate3.HibernateCallback; Bx&F* a;5
import fj,]dQT
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org.springframework.orm.hibernate3.support.HibernateDaoS 5lp};
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upport; ^>H+#@R
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import com.javaeye.common.util.PaginationSupport; #{]Yw}m
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public abstract class AbstractManager extends 7HkQ|~zGT
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HibernateDaoSupport { A0hfy|1#L
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privateboolean cacheQueries = false; ,O[Maj/ch
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privateString queryCacheRegion; _# mo6')j
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publicvoid setCacheQueries(boolean sKLH.@
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cacheQueries){ o"5[~$O
this.cacheQueries = cacheQueries; oF9c>^s
} #Lq{_Y
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publicvoid setQueryCacheRegion(String !"e~HZmr
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queryCacheRegion){ 4EB&Zmg[K
this.queryCacheRegion = 1G6MO
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queryCacheRegion; eJm7}\/6`
} buv*qPO
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publicvoid save(finalObject entity){ ".=LzjE<gv
getHibernateTemplate().save(entity); NX5A{
} d|, B* N(w
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publicvoid persist(finalObject entity){ 8iDg2_l`G
getHibernateTemplate().save(entity); -<0PBl
} Q:#Kt@W
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publicvoid update(finalObject entity){ <P"4Mk7`s
getHibernateTemplate().update(entity); ;& PK6G
} $^1L|KgXp
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publicvoid delete(finalObject entity){ DIU9Le
getHibernateTemplate().delete(entity); S
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} 8%;K#,>
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publicObject load(finalClass entity, az=(6PX
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finalSerializable id){ er[%Nt+99
return getHibernateTemplate().load %488"
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(entity, id); 7wU$P
} 4[eQ5$CB<u
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publicObject get(finalClass entity, eyiGe1^C
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finalSerializable id){ (DW[#2\.
return getHibernateTemplate().get ZSu0e%
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(entity, id); ca!=D $
} v\UwL-4[
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publicList findAll(finalClass entity){ |4F3Gu
return getHibernateTemplate().find("from kK]^q|vb6
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" + entity.getName()); _E{hB
} P=j89-e
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publicList findByNamedQuery(finalString {Va"o~io
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namedQuery){ F9|\(St &
return getHibernateTemplate +[DL]e]@U
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().findByNamedQuery(namedQuery); 0K&\5xXM
} Viu+#J;l
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publicList findByNamedQuery(finalString query, 5$T>noD
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finalObject parameter){ $:bU<
return getHibernateTemplate SgOn:xg;3L
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().findByNamedQuery(query, parameter); 'Si1r%'m#
} '<v/Gl\
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publicList findByNamedQuery(finalString query, Wy'H4Rg8
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finalObject[] parameters){ (v\Cv)OS
return getHibernateTemplate B`/cKfg
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().findByNamedQuery(query, parameters); )cMW,
} F_Q?0 Do0'
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publicList find(finalString query){ oM@X)6P_
return getHibernateTemplate().find _l`s}yC
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(query); WaVP+Ap
} 0wzq{~\{=_
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publicList find(finalString query, finalObject QX*HvT
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parameter){ ;(kU:b|j
return getHibernateTemplate().find l+>&-lX'
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(query, parameter); l"\W] 'T:r
} \gh`PS-B
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public PaginationSupport findPageByCriteria u= |hRTD=
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(final DetachedCriteria detachedCriteria){ s^/<6kwO
return findPageByCriteria y<G@7?
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ?w}E/(r
} *CA7
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public PaginationSupport findPageByCriteria #K3A{
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(final DetachedCriteria detachedCriteria, finalint CaZ{UGokL
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startIndex){ p2|BbC\N
return findPageByCriteria EH'?wh|Yp
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(detachedCriteria, PaginationSupport.PAGESIZE, %}U-g"I
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startIndex); s^nwF>
} MSmvQ
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public PaginationSupport findPageByCriteria EV:y}
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(final DetachedCriteria detachedCriteria, finalint c1IK9X*
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pageSize, *q8L$D
finalint startIndex){ .TN9N
return(PaginationSupport) hi>sDU<x
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getHibernateTemplate().execute(new HibernateCallback(){ <y(uu(c
publicObject doInHibernate Fejs9'cB
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(Session session)throws HibernateException { silTL_$
Criteria criteria = xGQ958@
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detachedCriteria.getExecutableCriteria(session); D?u*^?a2
int totalCount = .)W'{2J-
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((Integer) criteria.setProjection(Projections.rowCount 1*eWo~G
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()).uniqueResult()).intValue(); Xj;nh?\u
criteria.setProjection !b"#`O%`
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(null); 3_Su5~^
List items = JLsy|}>
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criteria.setFirstResult(startIndex).setMaxResults
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(pageSize).list(); UW+|1Bj_:
PaginationSupport ps = R qS2Qo]
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new PaginationSupport(items, totalCount, pageSize, taXS>*|B
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startIndex); E3#}:6m
return ps; Kc= &jCn
} tVUoUl
}, true); %C%~f{4
} T`{W$4XS
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public List findAllByCriteria(final ,TTt<&c
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DetachedCriteria detachedCriteria){ 8>Hnv]p
return(List) getHibernateTemplate d ,| W
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().execute(new HibernateCallback(){ qb y!
publicObject doInHibernate N(v<*jn
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(Session session)throws HibernateException { ^tIi;7k
Criteria criteria = "E;]?s9x
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detachedCriteria.getExecutableCriteria(session); T<\Q4Coth
return criteria.list(); 2G8f4vsC[
} !Y3w]_x[:
}, true); J7BfH,o
} ~S)o('
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public int getCountByCriteria(final 3&kHAXzM
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DetachedCriteria detachedCriteria){ 6elmLDMni\
Integer count = (Integer) *5iNw_&
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getHibernateTemplate().execute(new HibernateCallback(){ \?-`?QPux
publicObject doInHibernate =$UDa`}D
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(Session session)throws HibernateException { S(jbPQT
Criteria criteria = \$ L2xd
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detachedCriteria.getExecutableCriteria(session); yz!j9pJ
return eN@V?G26K
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criteria.setProjection(Projections.rowCount F{\MIuoy
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()).uniqueResult(); g4<w6eB
} dOArXp`s
}, true); +1Oi-$
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return count.intValue(); [G^ir
} $VYMAk&\
} NrVrR80Y
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用户在web层构造查询条件detachedCriteria,和可选的 K'~wlO@O
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 2-i>ymoOS
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PaginationSupport的实例ps。 uYAPGs#k
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ps.getItems()得到已分页好的结果集 Z[
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ps.getIndexes()得到分页索引的数组 S+A'\{f
ps.getTotalCount()得到总结果数 QD%~A0
ps.getStartIndex()当前分页索引 Pp1HOJYJp0
ps.getNextIndex()下一页索引 zlIXia5
ps.getPreviousIndex()上一页索引 dL'hC#!h
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 1 ry:Z2
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 DYJ@>8
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一下代码重构了。 TjGe8L:
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我把原本我的做法也提供出来供大家讨论吧: iy Zs:4jkc
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首先,为了实现分页查询,我封装了一个Page类: Lz2 AWqR
java代码: &*RJh'o|N(
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@ 'rk[S}A
/*Created on 2005-4-14*/ Ia$&SS)K
package org.flyware.util.page; wy"^a45h
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/** R| t"(6
* @author Joa |U%S<X
* O/$pT%D1x
*/ f m.-*`ax
publicclass Page { M0DdrL/
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/** imply if the page has previous page */ \[oU7r}?/V
privateboolean hasPrePage; {`BC$V
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/** imply if the page has next page */ D`PnY&ffT
privateboolean hasNextPage; EAp6IhW{
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/** the number of every page */ f
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privateint everyPage; nk9Kq\2f:
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/** the total page number */ qlmz@kTb
privateint totalPage; iD#HBo
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/** the number of current page */ RRig
privateint currentPage; @$z/=g sy
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/** the begin index of the records by the current ]W3D4Swq
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query */ \ Xow#@[
privateint beginIndex; E6|!G
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/** The default constructor */ ?I&ha-."
public Page(){ KB!.N[!v
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} fg"@qE-;
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/** construct the page by everyPage Lc(D2=%
* @param everyPage S3]Cz$
* */ Ps5UX6\ .m
public Page(int everyPage){ ZYZQ?FN
this.everyPage = everyPage; h[72iVn
} }C.M4{a\
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/** The whole constructor */ 8WK%g0gm
public Page(boolean hasPrePage, boolean hasNextPage, WJCEiH
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int everyPage, int totalPage, bs$x%CR
int currentPage, int beginIndex){ jC>l<d_
this.hasPrePage = hasPrePage; [RG&1~
this.hasNextPage = hasNextPage; [,)yc/{*
this.everyPage = everyPage; De,4r(5
this.totalPage = totalPage; @=q,,t$r
this.currentPage = currentPage; e|u|b
this.beginIndex = beginIndex; b}4k-hZL
} Hi #'h
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/** VQF!|*#
* @return B4 5B`Ay
* Returns the beginIndex. Y\luz`v
*/ \)859x&(
publicint getBeginIndex(){ n-[J+DdB
return beginIndex; uZ][#[u
} }yCJ#}
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/** J&%vBg^
* @param beginIndex E"!C3SC [
* The beginIndex to set. 'gd3 w~
*/ R[ p. )F7
publicvoid setBeginIndex(int beginIndex){ itb0dF1G
this.beginIndex = beginIndex; MJ'|$b}
}
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/** -]c5**O}
* @return } r^@Xh
* Returns the currentPage. YgiwtZ5FY
*/ wOQ-sp0q0
publicint getCurrentPage(){ 5\1Z"?
return currentPage; CZyOAoc<
} ^G%Bj`%
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/** CL%?K<um
* @param currentPage /'?Fz*b
* The currentPage to set. 6+"P$Ed#i
*/ -G&>b
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publicvoid setCurrentPage(int currentPage){ }LQ*vD-Jj
this.currentPage = currentPage; q#wg2
} ?T-6|vZA
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/** T5_z^7d
* @return 6He 7A@Eh
* Returns the everyPage. 2/S~l;x
*/ qp
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publicint getEveryPage(){ 0/P!rH9
return everyPage; iOz<n
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} yo*c& >
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/** vr56
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* @param everyPage JG&`l{c9
* The everyPage to set. *u.6,jw
*/ Wh[+cH"M
publicvoid setEveryPage(int everyPage){ OQ"%(w>Hb
this.everyPage = everyPage; 7cin?Z1
} b3}928!D-@
j eF1{ %
/** ?Z%Ja_}8ma
* @return mMmzi4HL
* Returns the hasNextPage. iJ_`ZM.w
*/ (;YO]U4
publicboolean getHasNextPage(){ '8`{u[:
return hasNextPage; I$0JAy
} 7 y}b (q=
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/** -a(f-
* @param hasNextPage =1t#$JG
* The hasNextPage to set. m)9N9Ii#)
*/ <K!5N&vh
publicvoid setHasNextPage(boolean hasNextPage){ F4X/ )$Dk
this.hasNextPage = hasNextPage; 'TpW-r:
} l!e8=QlJ
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/** |sz`w^#
* @return )3v0ex@Jl
* Returns the hasPrePage. *0M#{HQ
*/ 8[5%l7's
publicboolean getHasPrePage(){ Frn#?n)S9
return hasPrePage; P;0tI;
} 8}h ^Frh
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/** YfUdpa0
* @param hasPrePage m! &bK5+*
* The hasPrePage to set. Kv"e\
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*/ b1{~j]"$L
publicvoid setHasPrePage(boolean hasPrePage){ +(3"XYh
this.hasPrePage = hasPrePage; ; iQ@wOL]
} 0?l|A1I%
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/** k9UmTvX
* @return Returns the totalPage. pWH8ex+
* j~c7nWfX
*/ d$)'?Sf]h
publicint getTotalPage(){ [^ck;4q
return totalPage; Malt7M
} p%Ae"#_X%
="
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/** Pa2HFy2
* @param totalPage ~jAOGo/&6
* The totalPage to set. =BY)>0?z
*/ qT#+DDEAL
publicvoid setTotalPage(int totalPage){ f|Kd{ $VO
this.totalPage = totalPage; 65AXUTg
}
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} _=B(jJZ
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5)V]qV$
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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 q]:+0~cz
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个PageUtil,负责对Page对象进行构造: l)D18
java代码: Y{Kpopst
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