Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 NrfAr}v'E
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 LOe l6Ui
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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 .;%`I
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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 Q^Q6|
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分页支持类: W$Z8AZ{E
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java代码: CWS]821;
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package com.javaeye.common.util; G5!!^p~
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import java.util.List; +Sg+% 8T
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publicclass PaginationSupport { r.v.y[u
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publicfinalstaticint PAGESIZE = 30; N=c{@h
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privateint pageSize = PAGESIZE; a]0hB:
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privateList items; 5_4=(?<
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privateint totalCount; Poxoc-s
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privateint[] indexes = newint[0]; C$`^(?iO/
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privateint startIndex = 0; zl)r3#6hW
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public PaginationSupport(List items, int $qM&iI-l0
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totalCount){ :VlMszy}B3
setPageSize(PAGESIZE); (4FZK7Fm
setTotalCount(totalCount); G3.\x_;k
setItems(items); So}pA2[0
setStartIndex(0); $~'G<YYF4
} Ej$oRo{IG
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public PaginationSupport(List items, int 8,]wOxwqi
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totalCount, int startIndex){ DfVSG1g
setPageSize(PAGESIZE); 4\14HcTcK
setTotalCount(totalCount); I\('b9"*
setItems(items); fs8C ^Ik>~
setStartIndex(startIndex); "VA'W/yv!
} R{{?wr6b$
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public PaginationSupport(List items, int .8]=yPm
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totalCount, int pageSize, int startIndex){ Q*R9OF
setPageSize(pageSize); qex::Qf
setTotalCount(totalCount); +Q+!#
setItems(items); c"NGE
setStartIndex(startIndex); )wk9(|[o
} hGo/Ve+@
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publicList getItems(){ ,sltB3f
return items; P$"s*otr
} b:x*Hjf
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publicvoid setItems(List items){ __)"-\w-_(
this.items = items; UDHMNubB
} G+K`FUNA
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publicint getPageSize(){ , 4@C %
return pageSize; 4YCuO%
} j/hm)*\io
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publicvoid setPageSize(int pageSize){ X'usd$[.
this.pageSize = pageSize; uo7[T*<Q
} "2`/mtMon
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publicint getTotalCount(){ z#+Sf.
return totalCount; W
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} EP6@5PNZ
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publicvoid setTotalCount(int totalCount){ &}VVr
if(totalCount > 0){ ,/UuXX
this.totalCount = totalCount; ab*O7v
int count = totalCount / W(PNw2
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pageSize; P8GGN
if(totalCount % pageSize > 0) uEyu s96 +
count++; W7.QK/@
indexes = newint[count]; LEY k
for(int i = 0; i < count; i++){ k<%y+v
indexes = pageSize * (^^}Ke{J
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} NeniQeR
}else{ S,RC;D7
this.totalCount = 0; 57:27d0y
} FK;2u$:
}
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publicint[] getIndexes(){ b
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return indexes; &a";jO
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} `5Em : 8 M
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publicvoid setIndexes(int[] indexes){ MG74,D.f
this.indexes = indexes; .a}!!\@
} ^fvx2<
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publicint getStartIndex(){ i^V3u
return startIndex; fs*OR2YG7
} +}NQ|y V
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publicvoid setStartIndex(int startIndex){ i/F].Sag
if(totalCount <= 0) (2r808^2
this.startIndex = 0; ;>jOB>b{h
elseif(startIndex >= totalCount) %DhLU~VX
this.startIndex = indexes tdn|mX#
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[indexes.length - 1]; }*56DX
elseif(startIndex < 0) L7s
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this.startIndex = 0; poXT)2^)
else{ ilFS9A3P
this.startIndex = indexes rqhRrG{L|&
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[startIndex / pageSize]; 8<Ex`
} N-}|!pqb
} Q=#!wWVP
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publicint getNextIndex(){ cDh\$7'b
int nextIndex = getStartIndex() + M.KXDD#O
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pageSize; P'oY+#
if(nextIndex >= totalCount) opqf)C
return getStartIndex(); r+}<]?aT>-
else Px?0)^"2
return nextIndex; WsR4)U/]v
} -d6PXf5
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publicint getPreviousIndex(){ wO"ezQ
int previousIndex = getStartIndex() - >~@ABLp6
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pageSize; p *GAs
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if(previousIndex < 0) q:G3y[ P
return0; ".
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else TXfG@4~kC
return previousIndex; ,~7+r#q7
} .KF(_
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} XC\'8hL:
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抽象业务类 seNH/pRb
java代码: W29GM -,K
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/** j9 &0/
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* Created on 2005-7-12 :c0 |w
*/ &Y$)s<u8.
package com.javaeye.common.business; KPdlg.
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import java.io.Serializable; eEg>EI_U
import java.util.List; /5C>7BC
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import org.hibernate.Criteria; YPS,[F'B.
import org.hibernate.HibernateException; 8YkCTJfBGu
import org.hibernate.Session; #5_pE1
import org.hibernate.criterion.DetachedCriteria; mJS-x-@
import org.hibernate.criterion.Projections; <W88;d33r=
import Fo&ecWhw
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org.springframework.orm.hibernate3.HibernateCallback; &A~(9IV
import gYfOa`k
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org.springframework.orm.hibernate3.support.HibernateDaoS ;V)94YT
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upport; d(6&kXK
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import com.javaeye.common.util.PaginationSupport; L&qY709
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public abstract class AbstractManager extends bv'Z~@<c
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HibernateDaoSupport { /n#t.XJY*
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privateboolean cacheQueries = false; ceNJXK
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privateString queryCacheRegion; W[.UM
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publicvoid setCacheQueries(boolean Kw,ln<)2
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cacheQueries){ `pYL/[5
this.cacheQueries = cacheQueries; cUZ^,)8
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} U%_6'5s{^
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publicvoid setQueryCacheRegion(String v$bR&bCT
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queryCacheRegion){ \|Ya*8V
this.queryCacheRegion = =!PUKa3f<
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queryCacheRegion; 9Q*zf@w
} \}NZ]l
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publicvoid save(finalObject entity){ yy$7{9!
getHibernateTemplate().save(entity); ekO*(vQ~
} -Khb
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publicvoid persist(finalObject entity){ LQ=Fck~[r
getHibernateTemplate().save(entity); i+Btz-
} -xc'P,`
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publicvoid update(finalObject entity){ ^W<uc :L7
getHibernateTemplate().update(entity); |Xa|%f
} %dA7`7j
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publicvoid delete(finalObject entity){ 9A1w5|X
getHibernateTemplate().delete(entity); Se&%Dr3Nv
} AC/8 2$
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publicObject load(finalClass entity, d#wK
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finalSerializable id){ v0S7 ]?_
return getHibernateTemplate().load XP_V
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(entity, id); '8bT9
} B=J/HiwV)
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publicObject get(finalClass entity, [P"R+$"
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finalSerializable id){ k84JDPu#
return getHibernateTemplate().get 7q,M2v;
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(entity, id); t=oTU,<
} <IL$8a
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publicList findAll(finalClass entity){ +{S^A)
return getHibernateTemplate().find("from sy.U]QG
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" + entity.getName()); 9b*1-1"
} )t$|'c}
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publicList findByNamedQuery(finalString Uw5`zl
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namedQuery){ Ws(#ThA
return getHibernateTemplate &`4v,l^Zi6
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().findByNamedQuery(namedQuery); K# dV.
} ,zY!EHpx
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publicList findByNamedQuery(finalString query, &MsBcP[
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finalObject parameter){ a7UfRG
return getHibernateTemplate )q+9_KUq
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().findByNamedQuery(query, parameter); SRx `m,535
} 3xnu SOdh
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publicList findByNamedQuery(finalString query, (j;6}@
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finalObject[] parameters){ \aG:l.IM0
return getHibernateTemplate 4l*4wx""v
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().findByNamedQuery(query, parameters); L'Fy\K\
} A_WtmG_9
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publicList find(finalString query){ bqDHLoB\1
return getHibernateTemplate().find Hc{0O7
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(query); ]h$,=Qf
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} q"[8u ]j
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publicList find(finalString query, finalObject *r k!`n&
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parameter){ 4W''j[Y/
return getHibernateTemplate().find ,,>b=r_r&
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(query, parameter); Lh5d2}tcO
} ;9hi2_luV
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public PaginationSupport findPageByCriteria &<E*W*b[
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(final DetachedCriteria detachedCriteria){ +L86w7
return findPageByCriteria 058+_xX
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); O0gLu1*1v
} *XK9-%3
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public PaginationSupport findPageByCriteria Vnv9<=R
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(final DetachedCriteria detachedCriteria, finalint {rG`Upp
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startIndex){ @{Q[M3l
return findPageByCriteria u9*}@{,
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(detachedCriteria, PaginationSupport.PAGESIZE, 0/."R;
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startIndex); j:9kJq>mv
} -/.Xf<y58
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public PaginationSupport findPageByCriteria I%NPc4p
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(final DetachedCriteria detachedCriteria, finalint ec4jiE
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pageSize, I9`R LSn
finalint startIndex){ Oop;Y^gG}
return(PaginationSupport) KGclo-,
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getHibernateTemplate().execute(new HibernateCallback(){ n#G
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publicObject doInHibernate o[bG(qHZ
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(Session session)throws HibernateException { ,f4mFL0~N
Criteria criteria = bg'B^E3
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detachedCriteria.getExecutableCriteria(session); wR?M2*ri
int totalCount = oOhm`7iy
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((Integer) criteria.setProjection(Projections.rowCount $Wy7z^t
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()).uniqueResult()).intValue(); $Gs&'
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criteria.setProjection ->oQ,ezB
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(null); >o=3RB=Fh
List items = _be*B+?2 t
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criteria.setFirstResult(startIndex).setMaxResults Ds$8$1=L=k
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(pageSize).list(); u:pdY'`"#
PaginationSupport ps = " -4V48ci
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new PaginationSupport(items, totalCount, pageSize, oQC* d}_E}
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startIndex); 2roPZj
return ps; x+vNA J
} h94SLj]
}, true); ~ySmN}3~'
} r3l}I6
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public List findAllByCriteria(final @^y/V@lDm
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DetachedCriteria detachedCriteria){ z[DUktZl
return(List) getHibernateTemplate URDb
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().execute(new HibernateCallback(){ 2,O-/A;tW*
publicObject doInHibernate Wiqy".YY
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(Session session)throws HibernateException { =z]&E 78Y
Criteria criteria = K,[g<7X5
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detachedCriteria.getExecutableCriteria(session); aTs5^Kh')
return criteria.list(); f- pt8
} :<=!v5 SK
}, true); X-! yi
} ~1pJQ)!zlq
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public int getCountByCriteria(final e_+`%A+-
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DetachedCriteria detachedCriteria){ _=jc%@]1y
Integer count = (Integer) kL^;^!Nt
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getHibernateTemplate().execute(new HibernateCallback(){ ^ 3LM%B
publicObject doInHibernate .b]g#Du=
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(Session session)throws HibernateException { v@;:aN
Criteria criteria = PGMu6$
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detachedCriteria.getExecutableCriteria(session); 7Nc@7_=
return x{u_kepv[k
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criteria.setProjection(Projections.rowCount t'4hWNR'
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()).uniqueResult(); %}P^B^O
} k+44ud.j
}, true); ={b/s31H:
return count.intValue(); y-}lz#N
} 2GcQh]ohc
} ]Ole#Lz}Q
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用户在web层构造查询条件detachedCriteria,和可选的 0G9@A8LU
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 *#Hi W)
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PaginationSupport的实例ps。 TQ" [2cY
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ps.getItems()得到已分页好的结果集 |!dyk<}oIu
ps.getIndexes()得到分页索引的数组 m~r^@D
ps.getTotalCount()得到总结果数 a@zKi;
ps.getStartIndex()当前分页索引 DTN @b!
ps.getNextIndex()下一页索引 N7%Jy?-+
ps.getPreviousIndex()上一页索引 bXc7$5(!VB
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 6 -gx ba
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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 .%3bXK+F
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一下代码重构了。 I1kx3CwJ{P
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我把原本我的做法也提供出来供大家讨论吧: zUXqTcj
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首先,为了实现分页查询,我封装了一个Page类: b0x9}
java代码: (SoV2[|
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/*Created on 2005-4-14*/ v@`#!iu
package org.flyware.util.page; 6,uW{l8L
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/** 5)V J
* @author Joa <X
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* W DY,?
*/ x+nrdW+
publicclass Page { Hm`9M.5b
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/** imply if the page has previous page */ /`D]m?
privateboolean hasPrePage; u
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/** imply if the page has next page */ &B#HgWud
privateboolean hasNextPage; `BMg\2Ud*
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/** the number of every page */ ]XJpy-U
privateint everyPage; jr*A1y*
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/** the total page number */ zkI\ji
privateint totalPage; Jm\'=#U#
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/** the number of current page */
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privateint currentPage; %D\TLY
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/** the begin index of the records by the current B y6:
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query */ _,NL;66=[
privateint beginIndex; W*u Yb|0
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/** The default constructor */ Yj/S(4(h?
public Page(){ #_QvnQ?I
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} Bg"b,&/^u
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