Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 \&ra&3o
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 U1G"T(;s:
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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 Tm~a&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 $50A!h
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分页支持类: ysm)B?+k
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java代码: ~c~N _b
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package com.javaeye.common.util; d|CSWcU
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import java.util.List; ts/rV#s~
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publicclass PaginationSupport { IoWh&(+KdH
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publicfinalstaticint PAGESIZE = 30; <seb,> :
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privateint pageSize = PAGESIZE; H!mNHY_fA
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privateList items; =EwC6+8*M
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privateint totalCount; Z~)Bh~^A
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privateint[] indexes = newint[0]; hvCX,^LoJ
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privateint startIndex = 0; 5:v"^"S z
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public PaginationSupport(List items, int O& k+;r
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totalCount){ 5<h7+ %?t9
setPageSize(PAGESIZE); ovJwor
setTotalCount(totalCount); ~x;1&\'k
setItems(items); }qU(G3
setStartIndex(0); $'Z\'<k[
} l?GN& u
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public PaginationSupport(List items, int !\w@b`Iv8
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totalCount, int startIndex){ :MPWf4K2s
setPageSize(PAGESIZE); <yzgZXxIaS
setTotalCount(totalCount); |^p7:)cy
setItems(items); L5$r<t<
setStartIndex(startIndex); X:Z4QqT
} ^-Ob($(\
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public PaginationSupport(List items, int :k9n
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totalCount, int pageSize, int startIndex){
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setPageSize(pageSize); x[l_dmq
setTotalCount(totalCount); <Vucr
setItems(items); JwEQR
setStartIndex(startIndex); @%Y$@Qb{
} yg34b}m{
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publicList getItems(){ 6t@kft>Nv
return items; A'Q=DoE
} w5zrEk#
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publicvoid setItems(List items){ HUUN*yikj
this.items = items; k$]-fQM
} }4G/x;D
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publicint getPageSize(){ ]M%kt +u!
return pageSize; a&oz<4oT
} RMJq9a
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publicvoid setPageSize(int pageSize){ @BCws)
this.pageSize = pageSize; d +0(H
} _Q&O#f
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publicint getTotalCount(){ J*HZ=6L
return totalCount; Si=zxy T
} XL!\Lx
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publicvoid setTotalCount(int totalCount){ w}2 ;f=
if(totalCount > 0){ ]6JI((
this.totalCount = totalCount; JBzRL"|
int count = totalCount / ig
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pageSize; xZ2^lsY
if(totalCount % pageSize > 0) ~Q<h,P
count++; ?+6w8j%\
indexes = newint[count]; =e\E{K'f@
for(int i = 0; i < count; i++){ &oi*]:<FNe
indexes = pageSize * !<`}mE!:
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} Z*r;"WHB
}else{ EPO*{bN7O
this.totalCount = 0; Tgxxm
} $'m&RzZ
} %K@s0uQ
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publicint[] getIndexes(){ ynkPI6o
return indexes; J*4byu|
} }?PvNK]",
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publicvoid setIndexes(int[] indexes){ *WS'C}T
this.indexes = indexes; 4n1-@qTPF~
} 4q%hn3\
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publicint getStartIndex(){ WEX6I16
return startIndex; :.xdG>\n3
} g$=y#<2?
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publicvoid setStartIndex(int startIndex){ B^8]quOH
if(totalCount <= 0) y9<]F6TT
this.startIndex = 0; Y"eR&d
elseif(startIndex >= totalCount) UC@&! kM
this.startIndex = indexes 42 6l:>D(
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[indexes.length - 1]; UD.&p'^ /{
elseif(startIndex < 0) wO\,?SI4
this.startIndex = 0; s+mNr3
else{ R.ZC|bPiD
this.startIndex = indexes y~ubH{O#
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[startIndex / pageSize]; F|Y}X|x8Q
} <qGVOAnz+
} Z]Zs"$q@
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publicint getNextIndex(){
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int nextIndex = getStartIndex() + e-@=QI^,
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pageSize; ZH
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if(nextIndex >= totalCount) (<.uvq61
return getStartIndex(); >J!J:
else Mv\odf\]
return nextIndex; ,gdf7&r
} pxj}%LH
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publicint getPreviousIndex(){
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int previousIndex = getStartIndex() - 4VPJv>^
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pageSize; +A3Q$1F
if(previousIndex < 0) <4DSk9/
return0; g)o?nAr
else B Q)1)8r
return previousIndex; |{)SLvlJl
} m\h. sg&
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} +a@:?=hc
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抽象业务类 vbol70
java代码: ,[ogh
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/** {9 PeBc
* Created on 2005-7-12 gy%/zbZx
*/ M@R_t(&=
package com.javaeye.common.business; x37pj)i/
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import java.io.Serializable; xt{f+c@P
import java.util.List; X?B9Z8
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import org.hibernate.Criteria; ^:c:~F6J
import org.hibernate.HibernateException; h[Hn*g
import org.hibernate.Session; M=HP!hn
import org.hibernate.criterion.DetachedCriteria; HOEjLwH
import org.hibernate.criterion.Projections; )JYt zc
import OJ2O?Te8
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org.springframework.orm.hibernate3.HibernateCallback; m{~p(sQL
import &s]wf
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org.springframework.orm.hibernate3.support.HibernateDaoS 9)_fH6r
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upport; ZO^Y9\L
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import com.javaeye.common.util.PaginationSupport; O@n1E'S/
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public abstract class AbstractManager extends Wa/&H$d\u@
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HibernateDaoSupport { =*ZQGM 3w
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privateboolean cacheQueries = false; aP%&-W$D|
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privateString queryCacheRegion; 5LPyPL L
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publicvoid setCacheQueries(boolean cqr4P`Oj
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cacheQueries){ 9`3%o9V9Y
this.cacheQueries = cacheQueries; f/_RtOSw
} Z(' iZ'55F
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publicvoid setQueryCacheRegion(String 3jH8pO^
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queryCacheRegion){ _~^JRC[q
this.queryCacheRegion = ( k@%04c
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queryCacheRegion; 2 g)W-M
} s@WF[S7D
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publicvoid save(finalObject entity){ I 0/enL
getHibernateTemplate().save(entity); c[/h7!/aH
} k8]uy2R6}
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publicvoid persist(finalObject entity){ 9c/&+j
getHibernateTemplate().save(entity); \xQ10\u
} 0K0[mC}ZwM
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publicvoid update(finalObject entity){ ~|LlT^C
getHibernateTemplate().update(entity); |_=o0lf
} q- U/JC
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publicvoid delete(finalObject entity){ ?1r>t"e5
getHibernateTemplate().delete(entity); q~3dbj
} O<@S,/Q4
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publicObject load(finalClass entity, $@[`/Uh
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finalSerializable id){ #$<7
return getHibernateTemplate().load yK1Z&7>J>
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(entity, id); %T.4Aj
} dkz79G}e
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publicObject get(finalClass entity, {V> >a
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finalSerializable id){ /Dn,;@ZwAi
return getHibernateTemplate().get U%swqle4
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(entity, id); f}4bnu3
} KUr}?sdz
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publicList findAll(finalClass entity){ ;8Z\bHQ>
return getHibernateTemplate().find("from N8<Wm>GLX~
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" + entity.getName()); E1atXx
} 9~6FWBt
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publicList findByNamedQuery(finalString Qx9lcO_
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namedQuery){ t@a2@dX|
return getHibernateTemplate C?UV3
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q
().findByNamedQuery(namedQuery); 0;*1g47\
} h\ZnUn_J
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publicList findByNamedQuery(finalString query, LuM[*_8
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finalObject parameter){ W9!EjXg
return getHibernateTemplate REyk,s2"6
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().findByNamedQuery(query, parameter); "V|1w>s
} =Q % F~
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publicList findByNamedQuery(finalString query, *x^W`i
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finalObject[] parameters){ F_m[EB
return getHibernateTemplate #6])\
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().findByNamedQuery(query, parameters); GqFDN],Wp
} ,W"[q ~
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publicList find(finalString query){ 9{gY|2R_
return getHibernateTemplate().find , _K /e
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(query); ?8cgQf$
} 7$ vs X
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publicList find(finalString query, finalObject MHs2UN
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parameter){ Tw:j}ERq
return getHibernateTemplate().find {> T
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(query, parameter); OH2Xxr[bQ
} ]>E)0<t
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public PaginationSupport findPageByCriteria jB+K)NXHL
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(final DetachedCriteria detachedCriteria){ Hw 7
return findPageByCriteria |@{4zoP_N
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Ks|qJ3;
} q; &\77i$
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public PaginationSupport findPageByCriteria inO)Y]|f
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(final DetachedCriteria detachedCriteria, finalint gq[|>Rs75
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startIndex){ B d#D*"gx
return findPageByCriteria ~>h_#sIBC
,{"%-U#z
(detachedCriteria, PaginationSupport.PAGESIZE, !j'9>G{T
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startIndex); PuKT0*_ 7
} |"4+~z%/9!
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public PaginationSupport findPageByCriteria QU4/hS;Ux
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(final DetachedCriteria detachedCriteria, finalint qmNg Ez%
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pageSize, 8ZY F%
finalint startIndex){ T$ <l<.Qd
return(PaginationSupport) q J)[2:.G
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getHibernateTemplate().execute(new HibernateCallback(){ o :`>r/SlL
publicObject doInHibernate XH9Y|FX%#
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(Session session)throws HibernateException { FW](GWp`:
Criteria criteria = S8+GM
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detachedCriteria.getExecutableCriteria(session); L9,;zkgo
int totalCount = 0L3v[%_j"
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((Integer) criteria.setProjection(Projections.rowCount P?- #d\qi
@FC|1=+
()).uniqueResult()).intValue(); N3J T[7
criteria.setProjection uB;\nj5'D
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(null); *V@>E2@
List items = ]: VR3e"H
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criteria.setFirstResult(startIndex).setMaxResults * z,] mi%
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(pageSize).list(); ~
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PaginationSupport ps = PtfxF]%H
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new PaginationSupport(items, totalCount, pageSize, xqP DL9\
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startIndex); %}T' 3
return ps; lB7 V4
} -&L(0?*qo
}, true); 7w}PYp1Z'~
} N0]C?+
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public List findAllByCriteria(final 5somoV B
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DetachedCriteria detachedCriteria){ 9j[lr${A
return(List) getHibernateTemplate dfo_R
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().execute(new HibernateCallback(){ 33O O%rWi
publicObject doInHibernate y7iHB
k"^:
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(Session session)throws HibernateException { n U0
Criteria criteria = -SyQ`V)T7N
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detachedCriteria.getExecutableCriteria(session); rn$LZE
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return criteria.list(); -0pAj}_2}
} MST\_s%[
}, true); mpsi{%gA
}
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public int getCountByCriteria(final 6[\b]I\Q
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DetachedCriteria detachedCriteria){ `>kHJI4
Integer count = (Integer) 4&)4hF
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getHibernateTemplate().execute(new HibernateCallback(){ orT%lHwjL
publicObject doInHibernate wD*z >v$
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(Session session)throws HibernateException { nnw5
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Criteria criteria = pn5A6
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detachedCriteria.getExecutableCriteria(session); F.N4Q'2Z
return ZvQ~K(3
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criteria.setProjection(Projections.rowCount Cob<N'.
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()).uniqueResult(); e!eUgD
} d]fo>[%Xr
}, true); ")gd)_FOS
return count.intValue(); GjHV|)^
} ~s$
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} JPsR7f
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用户在web层构造查询条件detachedCriteria,和可选的 }]fJ[KbDp
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 f:w#r.]
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PaginationSupport的实例ps。 hny(:Dj
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ps.getItems()得到已分页好的结果集 t;>"V.F<1
ps.getIndexes()得到分页索引的数组 yf lt2 R
ps.getTotalCount()得到总结果数 bwr}Ge
ps.getStartIndex()当前分页索引 &,4 3&pFU
ps.getNextIndex()下一页索引
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ps.getPreviousIndex()上一页索引 "OdR"M(G\
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 g^`;B"
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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 RhL!Zz
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一下代码重构了。 c:$W5j('Z
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我把原本我的做法也提供出来供大家讨论吧: \[!k`6#t7
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首先,为了实现分页查询,我封装了一个Page类: CO)BF%?B
java代码: L\`uD[g
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/*Created on 2005-4-14*/ )/B'
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package org.flyware.util.page; hwon^?
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/** |=xK-;qs
* @author Joa g_T[m*
* *.+Eg$'~V
*/ dx<KZR$!V
publicclass Page { yv2&K=rZp
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/** imply if the page has previous page */ t9Sog~:'
privateboolean hasPrePage;
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t7(#Cuv-
/** imply if the page has next page */ O<H5W|cM
privateboolean hasNextPage; <<ze84E
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/** the number of every page */ I_h8)W
privateint everyPage; cTq}H_hC
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/** the total page number */ !8z,}HUdK
privateint totalPage; V~9s+>
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/** the number of current page */ ^hMJNy&R
privateint currentPage; H7I&Ky
@$e!|.{1q
/** the begin index of the records by the current szDd!(&pv
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query */ byyzXRO;
privateint beginIndex; 2G(RQ\Ro*
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/** The default constructor */ &B;M.sz~C4
public Page(){ [1 ?
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} IKm_YQ$XOy
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/** construct the page by everyPage p>O>^R
* @param everyPage | M|5Nc>W
* */ AJ:(NV1=
public Page(int everyPage){ tbNIl cAWS
this.everyPage = everyPage; A<+veqb4
} }H>}v/
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/** The whole constructor */ \?|FB~.Ry
public Page(boolean hasPrePage, boolean hasNextPage, E\X:VQ9
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int everyPage, int totalPage, ~0^d-,ZD5
int currentPage, int beginIndex){ h"/y$
this.hasPrePage = hasPrePage; 0fpxr`
this.hasNextPage = hasNextPage; {e1akg.
this.everyPage = everyPage; :M |<c9I
this.totalPage = totalPage; qZcRK9l]F1
this.currentPage = currentPage; mfI>1W(
this.beginIndex = beginIndex; [ITtg?]F
} R)<PCe`vf
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/** q#mw#Uw-
* @return )[c@5zy~*
* Returns the beginIndex. ^e1Ux
*/ w<0F-0:8
publicint getBeginIndex(){ Avc9W[4
return beginIndex; ;:%*h2
} zFq8xw
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/** q0>@!1Wb
* @param beginIndex P>i!f!o*I
* The beginIndex to set. %#zqZ|q
*/ UP})j.z
publicvoid setBeginIndex(int beginIndex){ cGE,3dsF[
this.beginIndex = beginIndex; { +$zgg
} :O~*}7G
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/** >[D(<b(U&
* @return V/8"@C
* Returns the currentPage. DUAI
*/ T08SGB]
publicint getCurrentPage(){ gZ^'hW-{
return currentPage; p;Lp-9H\33
} Hkv4^|
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/** S]O0zv^}
* @param currentPage $BPTk0Y
* The currentPage to set. @rV|7%u
*/ SdJGhU
publicvoid setCurrentPage(int currentPage){ 9 :ubPqt
this.currentPage = currentPage; !
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} EV$$wrohQ`
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/** X>$s>})Y
* @return REj<2Lo
* Returns the everyPage. MKr)6PG,
*/ 0[O ."9
publicint getEveryPage(){ /4!.G#DLQ
return everyPage; Si:$zGL$(
} G|h@O'
*MG*]\D
/** 5r-OE-U{
* @param everyPage 4^jIV!V
* The everyPage to set. gpe/ dfyJ9
*/ L2jjkyX]
publicvoid setEveryPage(int everyPage){ ,*r}23
this.everyPage = everyPage; z87_/(nu
} u5 1%~
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/** /M3UK
* @return :Nt_LsH
* Returns the hasNextPage. \mIm}+!H
*/ L6ifT`;T
publicboolean getHasNextPage(){ z^etH/]Sy
return hasNextPage; h,(f3Ik0O
} ^s;xLGl]
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/** m,"N4a@
* @param hasNextPage 8F;f&&L"y
* The hasNextPage to set. yG ,oSp|
*/ #j?SdQ
publicvoid setHasNextPage(boolean hasNextPage){ 0&@pD`K e
this.hasNextPage = hasNextPage; L#}HeOEi[
} XS&oW
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/** yltzf
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* @return |_A DG
* Returns the hasPrePage. 8do7`mN
*/ P>wDr`*
publicboolean getHasPrePage(){ /KCJ)0UU
return hasPrePage; "{lw;AA5F
} 3%NbT
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/** z/Kjz$l!
* @param hasPrePage l?rT_uO 4
* The hasPrePage to set. dZ"B6L!^(
*/ c'XvZNf .C
publicvoid setHasPrePage(boolean hasPrePage){ @'ln)RT,
this.hasPrePage = hasPrePage; T]fBVA
} Shm$>\~=
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/** iYE7BUH=
* @return Returns the totalPage. uK_R#^
* D rMG{Yiu
*/ }iZ>Gm'5
publicint getTotalPage(){ s&