Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 e> -fI_+b
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 {k8R6l1
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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 VBv|7S
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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 *BFG{P
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分页支持类: 7X`]}z4g
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java代码: PJ3M,2H1b.
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package com.javaeye.common.util; $@^*lUw
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import java.util.List; 5DxNHEuS
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publicclass PaginationSupport { ^n~bx*f
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publicfinalstaticint PAGESIZE = 30; )/cf%
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privateint pageSize = PAGESIZE; hh7unHt-
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privateList items; JBk >|q"
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privateint totalCount; []b=
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privateint[] indexes = newint[0]; r%\%tz'`j
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privateint startIndex = 0; $q*hE&x
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public PaginationSupport(List items, int ^2C
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totalCount){ 7&&3@96<*#
setPageSize(PAGESIZE); tE WolO[\
setTotalCount(totalCount); 7A"v:e
setItems(items); z9Nial`p
setStartIndex(0); 4@r76v}{
} G3dA`3
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public PaginationSupport(List items, int )m_q2xV
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totalCount, int startIndex){ wQX18aF/#d
setPageSize(PAGESIZE); ~CuJ$(9Y
setTotalCount(totalCount); R4vf
setItems(items); Te2C<c
setStartIndex(startIndex); (tvfF0~
} (lg~}Jwq
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public PaginationSupport(List items, int %E2V$l0
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totalCount, int pageSize, int startIndex){ ;
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setPageSize(pageSize); _E2W%N
setTotalCount(totalCount); L@"&s#~=3
setItems(items); {uN-bl?o
setStartIndex(startIndex); M$s9
} `Z^\<{z
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publicList getItems(){ BU.O[?@64
return items; :!yPR
} ~s*kuj'%+
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publicvoid setItems(List items){ S S fNI>
this.items = items; d<RJH
} 3b[.s9Q
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publicint getPageSize(){ |[!7^tU*
return pageSize; V3(8?Fz.
} P!dSJ1'oC
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publicvoid setPageSize(int pageSize){ N\anjG
this.pageSize = pageSize; zl<D"eP
} I,W`s
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publicint getTotalCount(){ >i"WKd=
return totalCount; EY^?@D_<
} $8}'h
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publicvoid setTotalCount(int totalCount){ rvuasr~
if(totalCount > 0){ =q}Z2 OoYh
this.totalCount = totalCount; Rj3ad 3z'E
int count = totalCount / u#UtPF7q
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pageSize; _rg*K
if(totalCount % pageSize > 0) ?[;>1+D
count++; De2$:?
indexes = newint[count]; N}nE?|N=5
for(int i = 0; i < count; i++){ o)n=n!A
indexes = pageSize * ZCuo YE$g
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} 2~R%_r+<
}else{ "B>8on8O
this.totalCount = 0; (TU/EU5
} 3L36
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} aNBwb9X
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publicint[] getIndexes(){ =b, m31
return indexes; md `=2l
} zkquXzlgB
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publicvoid setIndexes(int[] indexes){ ~n$\[rQ
this.indexes = indexes; Ehxu`>@N
} tUt_Q;%yC
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publicint getStartIndex(){ D#A6s32a
return startIndex; Y]7 6y>|e
} bFSs{\zE
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publicvoid setStartIndex(int startIndex){ Lp(i&A
if(totalCount <= 0) I4KE@H"%7
this.startIndex = 0; aW}d=y[
elseif(startIndex >= totalCount) 7'#_uAQR
this.startIndex = indexes R3>c\mA
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[indexes.length - 1]; [^W
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elseif(startIndex < 0) `{m,&[n
this.startIndex = 0; %j/pln&
else{ KcUR
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this.startIndex = indexes eV~"T2!Sb
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[startIndex / pageSize]; BwrX.!M
} ;2$0j1>
} 5WvsS(
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publicint getNextIndex(){ 'j-U=2,n
int nextIndex = getStartIndex() + jYvl-2A'
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pageSize; 4;Vi@(G)
if(nextIndex >= totalCount) DIfQ~O+u
return getStartIndex(); GG"6O_
else 2x<!>B
return nextIndex; Fy0sn|
} L6#4A3yh
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publicint getPreviousIndex(){ |3^U\r^zo
int previousIndex = getStartIndex() - r-*j"1 e
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pageSize; zXU
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if(previousIndex < 0) @vB-.XU
return0; jz]}%O
else ahQY-%>
return previousIndex; 4j8$&~/
} rNurzag
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} kBxEp/y
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抽象业务类 IMBjI#\
java代码: R1/c@HQw?
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/** ,FXc_BCx4
* Created on 2005-7-12 !zvOCAb,
*/ rxqSi0p
package com.javaeye.common.business; .6C6ZUB;
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import java.io.Serializable; 3,K\ZUU.,
import java.util.List; A7,%'.k
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import org.hibernate.Criteria; ^d@2Y0hH
import org.hibernate.HibernateException; bt(Y@3;
import org.hibernate.Session; ~)n[Vf
import org.hibernate.criterion.DetachedCriteria; 3fA+{Y8S
import org.hibernate.criterion.Projections; X6T[+]Gc
import TZ `Ypi7r
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org.springframework.orm.hibernate3.HibernateCallback; Gz BPI'C
import ,k=8|=aF
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org.springframework.orm.hibernate3.support.HibernateDaoS
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upport; lSlZ^.&
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import com.javaeye.common.util.PaginationSupport; u{h67N
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public abstract class AbstractManager extends 5gII|8>rQ
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HibernateDaoSupport { Qc)i?Z'6
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privateboolean cacheQueries = false; p*)I QM<B
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privateString queryCacheRegion; TUz4-Pd
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publicvoid setCacheQueries(boolean r>7+&s*yk
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cacheQueries){ Aj=GekX{
this.cacheQueries = cacheQueries; !h|,wq]k
} ,Q3OQ[Nmh
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publicvoid setQueryCacheRegion(String x0jaTlU/
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queryCacheRegion){ w-2#CX8jY
this.queryCacheRegion = PTLlLa85<
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queryCacheRegion; ^1vKhO+p$
} UP$>,05z6
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publicvoid save(finalObject entity){ k52IvB@2
getHibernateTemplate().save(entity); MmfBFt*
} +3o0GJ
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publicvoid persist(finalObject entity){ [7d(PEQL`
getHibernateTemplate().save(entity); *9uNM@7&0
} GlTpK^.
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publicvoid update(finalObject entity){ S9]I[4
getHibernateTemplate().update(entity); ~]QQaP
} L\UGC%]9
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publicvoid delete(finalObject entity){ &P>& T
getHibernateTemplate().delete(entity); !02y'JS1
} aL*MC gb'
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publicObject load(finalClass entity, %OB>FY:|
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finalSerializable id){ 0ju-l=w
return getHibernateTemplate().load >
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(entity, id); !=PH5jTY
} @TD=or .&
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publicObject get(finalClass entity, 3)ox8,{%}
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finalSerializable id){ 8a`3eM~?[
return getHibernateTemplate().get RXg\A!5GV
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(entity, id); -j]c(Q MA]
} `B4Ilh"d
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publicList findAll(finalClass entity){ ,zr9* t
return getHibernateTemplate().find("from 7M7Lj0Y)L
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" + entity.getName()); ]u!s-=3s
} ZJU
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publicList findByNamedQuery(finalString *$|f9jVh
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namedQuery){ bGL} nPo
return getHibernateTemplate J`)/\9'&&
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().findByNamedQuery(namedQuery); O8b#'f~
} cW_wIy\]&
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publicList findByNamedQuery(finalString query, f=}T^Z<
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finalObject parameter){ %K')_NS@
return getHibernateTemplate NK/y,f6
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().findByNamedQuery(query, parameter); a>W++8t1 ;
} ,b -
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publicList findByNamedQuery(finalString query, 7gN;9pc$
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finalObject[] parameters){ gC(S(osF
return getHibernateTemplate 4'dN7E1*f
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().findByNamedQuery(query, parameters); )Sb-e(sl
} <mlN\BcX;
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publicList find(finalString query){ JygJ4RI%j
return getHibernateTemplate().find {l!{b1KJ
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(query); B
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} 6xtgnl#T
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publicList find(finalString query, finalObject TP {\V>*Yz
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parameter){ RV_I&HD!
return getHibernateTemplate().find 2(0%{*m
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(query, parameter); 1uN;JN
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} (}6\_k[}m
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public PaginationSupport findPageByCriteria gBhX=2%
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(final DetachedCriteria detachedCriteria){ f~\H|E8(
return findPageByCriteria w^
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); r>ed/<_>m;
} 9v`sSTlSd
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public PaginationSupport findPageByCriteria He'VqUw_
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(final DetachedCriteria detachedCriteria, finalint O2ktqAWx@
N,rd= m+
startIndex){ J-'XT_k:iM
return findPageByCriteria 1!G}*38;
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(detachedCriteria, PaginationSupport.PAGESIZE, &.DRAD)
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startIndex); {g1"{
} VFZ?<m
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public PaginationSupport findPageByCriteria 9%|skTgIqH
^
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(final DetachedCriteria detachedCriteria, finalint LH_H
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pageSize, 4GF3.?3
finalint startIndex){ ,)*[Xa_n
return(PaginationSupport) )uOtQ0
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getHibernateTemplate().execute(new HibernateCallback(){ i&lW&]
publicObject doInHibernate 68h1Wjg:"!
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(Session session)throws HibernateException { zEO~mJzo
Criteria criteria = P HOngn
{
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detachedCriteria.getExecutableCriteria(session); j>;1jzr2}
int totalCount = -ak.wwx\
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((Integer) criteria.setProjection(Projections.rowCount syg{qtBz^
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()).uniqueResult()).intValue(); 0(Y,Q(JTo&
criteria.setProjection !Whx^B:
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(null); qGH[kd
List items = lMu9Dp
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criteria.setFirstResult(startIndex).setMaxResults Xw'sh#i2
$8U$.~v
(pageSize).list(); m-\_L=QzM
PaginationSupport ps = 4(P<'FK $
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new PaginationSupport(items, totalCount, pageSize, mMXDzAllB
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startIndex); C^,baCX
return ps; eq%cRd]u
} xS%&l)dT
}, true); :3R3>o6m
} O>hh
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public List findAllByCriteria(final ~D}fy
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DetachedCriteria detachedCriteria){ *&Iv Eu
return(List) getHibernateTemplate /D^ g"
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().execute(new HibernateCallback(){ ]!^wB 3j
publicObject doInHibernate "@^<~bw
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(Session session)throws HibernateException { NY<qoV
Criteria criteria = ktynIN
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detachedCriteria.getExecutableCriteria(session); h>*3i#
return criteria.list(); 3GKKC9C6
} k3t]lGp
}, true); fA<os+*9i
} [Q8Wy/o
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public int getCountByCriteria(final hM!g6\ w
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DetachedCriteria detachedCriteria){ !m~r0M7
Integer count = (Integer) %pOxt<
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getHibernateTemplate().execute(new HibernateCallback(){ ^
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publicObject doInHibernate HU/4K7e`
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(Session session)throws HibernateException { {aV,h@>
Criteria criteria = q1L>nvE
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detachedCriteria.getExecutableCriteria(session); V >eG\
return > O?<?
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criteria.setProjection(Projections.rowCount 5655)u.N8
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()).uniqueResult(); q]pHD})O
} @|"K"j#
}, true); n+&8Uk
return count.intValue(); P(I%9
}
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} vs+aUT C\
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用户在web层构造查询条件detachedCriteria,和可选的 zBq&/?
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Y=Ic<WHR
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PaginationSupport的实例ps。 KwaxNb5
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ps.getItems()得到已分页好的结果集 ,d lq2
ps.getIndexes()得到分页索引的数组 i9qIaG/
ps.getTotalCount()得到总结果数 l44QB8
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ps.getStartIndex()当前分页索引 4HZXv\$
ps.getNextIndex()下一页索引 2#yDVN$
ps.getPreviousIndex()上一页索引 N$t<&5+
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 IIGx+>
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 3rHn?
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一下代码重构了。 M6A0D+08
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我把原本我的做法也提供出来供大家讨论吧: kd"nBb=
F/LMk8RgR
首先,为了实现分页查询,我封装了一个Page类: `S-%}eUv
java代码: +!ljq~%
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/*Created on 2005-4-14*/ *CQZ6&^
package org.flyware.util.page; "WtYqXyd
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/** `s+kYWg'Z
* @author Joa \5j}6Wj
* Z;1r=p#s
*/ H0])>1sWB
publicclass Page { 9Qu(RbDqC
=<PEvIn
/** imply if the page has previous page */ ':tdb$h
privateboolean hasPrePage; .w{Y3,dd>
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/** imply if the page has next page */ %#&njP
privateboolean hasNextPage; t\YM Hq<Y
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/** the number of every page */
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privateint everyPage; %;u"2L0@
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/** the total page number */ W?kJ+1"(
privateint totalPage; m`$Q/SyvG
)/Eu=+d
/** the number of current page */ q=`n3+N_H~
privateint currentPage; #rr!ApJ
0J466H_d{
/** the begin index of the records by the current S#y GqN0i
+%klS `_
query */ ,g0t&jITo
privateint beginIndex; Np$&8v+en
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/** The default constructor */ YXqYIG.G
public Page(){ zv;xxAX
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} }f}? |&q
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/** construct the page by everyPage [~\]<;;\
* @param everyPage IqepR
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* */ PXtF#,roP
public Page(int everyPage){ 3XDU(#
this.everyPage = everyPage; }hg2}g99
} W4k$m2
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