Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 /EvnwYQy
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 8ioxb`U
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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 (>,}C/-UG
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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 Ly~s84k_po
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分页支持类: Z,QSbw@,7
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java代码: u-k!h
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package com.javaeye.common.util; 4yDWVd;
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import java.util.List; +eVm+4WK
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publicclass PaginationSupport { Cj10?BNV)
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publicfinalstaticint PAGESIZE = 30; 1\LK[tvh
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privateint pageSize = PAGESIZE; i}_d&.DbF
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privateList items; $.Qu55=z<
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privateint totalCount; A4IPd
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privateint[] indexes = newint[0];
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privateint startIndex = 0; =|O><O|
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public PaginationSupport(List items, int "o>` Y
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totalCount){ ,0^9VWZV
setPageSize(PAGESIZE); 5cZKk/"Ad}
setTotalCount(totalCount); KKGwMJku}
setItems(items); JrJTIUf_
setStartIndex(0); mKZ^FgG
} "SFs\] Z
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public PaginationSupport(List items, int m'"Ra-
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totalCount, int startIndex){ |W;EPQ+<
setPageSize(PAGESIZE); LT:*K!>NOL
setTotalCount(totalCount); x67,3CLy?
setItems(items); )A*Sl2ew
setStartIndex(startIndex); ?t"bF :!
}
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public PaginationSupport(List items, int -z?O^:e#x
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totalCount, int pageSize, int startIndex){ ^SJa/I EZ.
setPageSize(pageSize); |X0Ys8f
setTotalCount(totalCount); mP+rPDGp
setItems(items); [+
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setStartIndex(startIndex); O#@KP"8
} J%ue{PL7
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publicList getItems(){ A]%hM_5 s
return items; X0zE-h6P
} zmpQ=%/H
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publicvoid setItems(List items){ b 1t7/q
this.items = items; Z<~^(W7h
} Nbm=;FHB`
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publicint getPageSize(){ MnT+p[.
return pageSize; jY8u1z
} QAK.Qk?Qu
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publicvoid setPageSize(int pageSize){ SPY4l*kX
this.pageSize = pageSize; f')3~)"
} n$YCIW)0
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publicint getTotalCount(){ G[[NDK
return totalCount; ^bckl
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} ]J6+nA6)
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publicvoid setTotalCount(int totalCount){ ,';+A{aV
if(totalCount > 0){ aShZdeC*f
this.totalCount = totalCount; i4*!t.eI
int count = totalCount / zFk@Y
^"\.,Y
pageSize; H=k`7YN
if(totalCount % pageSize > 0) $[-{Mm
count++; C%+>uzVIw
indexes = newint[count]; `Ao;xOJ
for(int i = 0; i < count; i++){ 8L}N,6gC4_
indexes = pageSize * Zjh9jvsW
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i; OJ\rT.{
} TAn.5
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}else{ w=H4#a?fc
this.totalCount = 0; SsF
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} $/uNV1]o
} Cb/?hT
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publicint[] getIndexes(){ /,Sd
return indexes; Q|W!m0XO
} *cn#W]AE
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publicvoid setIndexes(int[] indexes){ tHo0q<.oX
this.indexes = indexes; CJNz J(
} %1p4K)
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publicint getStartIndex(){ Pf]O'G&F
return startIndex; 4MOA}FZ~
} ,.+"10=N.
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publicvoid setStartIndex(int startIndex){ Ev\kq>2O
if(totalCount <= 0) K-}'Fiq
this.startIndex = 0; W<uL{k.Kpd
elseif(startIndex >= totalCount) 6}6ky9
this.startIndex = indexes ]m(5>h#
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[indexes.length - 1]; 4';]fmf@[i
elseif(startIndex < 0) >MIp r
this.startIndex = 0; 'D4KaM.d
else{ <#9zc'ED:
this.startIndex = indexes /@bLc1"
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[startIndex / pageSize]; |V|)cPQ
} tK|hC[
} 5}4MXI4
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publicint getNextIndex(){ |k4ZTr]?
int nextIndex = getStartIndex() + q61
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pageSize; r4c3t,L*$I
if(nextIndex >= totalCount) Gr;~P*
return getStartIndex(); \[+\JWJj
else "Rp ]2'?
return nextIndex; $u4esg
} 'c<@SVF{Zz
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publicint getPreviousIndex(){ Hvq< _&2
int previousIndex = getStartIndex() - 7=ZB;(`L1
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pageSize; XjwTjgL<
if(previousIndex < 0) `<>8tZS9"
return0; XfxNyZsy&>
else Xklp6{VH9
return previousIndex; NwG&uc+Q
} [VPqI~u5)
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} 1*r{%6
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抽象业务类 S@7A)
java代码: ,U'Er#U
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/**
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* Created on 2005-7-12 -c=IO(B/
*/ r DY q]`
package com.javaeye.common.business; 1{"fmV
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import java.io.Serializable; 3@}HdLmN|
import java.util.List; N_VAdNJ^:
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import org.hibernate.Criteria; ,oP-:q!PC
import org.hibernate.HibernateException; ^%d+nKx9nL
import org.hibernate.Session; ){>;eky
import org.hibernate.criterion.DetachedCriteria; ~pj9_I
import org.hibernate.criterion.Projections; SAG)vmm
import (>0d+ KT
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org.springframework.orm.hibernate3.HibernateCallback; z PV/{)S
import oUw-l_ M]
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org.springframework.orm.hibernate3.support.HibernateDaoS |<ke>j/6n
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upport; `bT{E.(T
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import com.javaeye.common.util.PaginationSupport; ^@)/VfVg
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public abstract class AbstractManager extends )hQNIt3o_
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HibernateDaoSupport { XE$eHx3;
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privateboolean cacheQueries = false; 3<+l.Wly
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privateString queryCacheRegion; O:7y-r0i
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publicvoid setCacheQueries(boolean u'K<-U8H
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cacheQueries){ x\Sp~]o3C
this.cacheQueries = cacheQueries; T"d]QYJS
} il-&d]AP
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publicvoid setQueryCacheRegion(String %k$C
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queryCacheRegion){ RV(}\JU
this.queryCacheRegion = J*U(f{Q(
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queryCacheRegion; ]K9x<@!
} j9u-C/Q\r
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publicvoid save(finalObject entity){ LOida# R
getHibernateTemplate().save(entity); ^m1Rw|
} .X2mEnh
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publicvoid persist(finalObject entity){ L8j,?u#
getHibernateTemplate().save(entity); C}1(@$
} iD(K*[;lc
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publicvoid update(finalObject entity){ @ ~sp:l
getHibernateTemplate().update(entity); 6PMu;#
}
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publicvoid delete(finalObject entity){ p[uwG31IL`
getHibernateTemplate().delete(entity); J)fS2Ni+
} D9LwYftZ
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publicObject load(finalClass entity, r\3In-(AT
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finalSerializable id){ lHGv:TN
return getHibernateTemplate().load Xj-3C[8@
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(entity, id); &e rNVD5o
} g{J3Ba
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publicObject get(finalClass entity, T]vD ,I+
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finalSerializable id){ _>`0!mG
return getHibernateTemplate().get yQx>h6
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(entity, id); #SqOJX~Q
} tRv#%>fj
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publicList findAll(finalClass entity){ Lw#hnLI.
return getHibernateTemplate().find("from z H \*v'
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" + entity.getName()); Z?x]HB`r
} {[9^@k
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publicList findByNamedQuery(finalString 8p211MQ<
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namedQuery){ SUVr&S6Nk
return getHibernateTemplate & aLR'*]6
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().findByNamedQuery(namedQuery); !.J~`Y'd_
} ;% !?dH6
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publicList findByNamedQuery(finalString query, ^4fkZh
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finalObject parameter){ ;I7Z*'5!
return getHibernateTemplate k
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;4_n:XUgo;
().findByNamedQuery(query, parameter); ~J2Q0Jv
} *@ o3{0[Z
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publicList findByNamedQuery(finalString query, lR(&Wc\j
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finalObject[] parameters){ qQ_B[?+W
return getHibernateTemplate iBi/9
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().findByNamedQuery(query, parameters); ~8X'p6
} LH_ 2oJ\
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publicList find(finalString query){ NWpRzh8$u
return getHibernateTemplate().find `Q8 D[
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(query); Kq?7#,_
} 4J_%quxO
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publicList find(finalString query, finalObject Qh[t##I/
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parameter){ t}tKm
return getHibernateTemplate().find 4Klfnki
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(query, parameter); @bx2=
} 9j"\Lr*o"
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public PaginationSupport findPageByCriteria at*=#?M1?
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(final DetachedCriteria detachedCriteria){ 2ya`2 m
return findPageByCriteria _"bx#B*
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); @CmxH(-i-
} ?MYD}`Cv
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public PaginationSupport findPageByCriteria YZ>cE#
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(final DetachedCriteria detachedCriteria, finalint fUXp)0O
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startIndex){ fUL"fMoU
return findPageByCriteria $T4PC5.
fh^_=R(/
(detachedCriteria, PaginationSupport.PAGESIZE, @\y7
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startIndex); !D3}5A1,
} Lk9>7xY
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public PaginationSupport findPageByCriteria ge[i&,.&z
+ LwoBn>6
(final DetachedCriteria detachedCriteria, finalint IT(c'}
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pageSize, Z@ kC28
finalint startIndex){ |
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return(PaginationSupport) Z|c9%.,
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getHibernateTemplate().execute(new HibernateCallback(){ )ta5y7np
publicObject doInHibernate {yHfE,
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(Session session)throws HibernateException { 4AYc8Z#'
Criteria criteria = pL@zZK0
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detachedCriteria.getExecutableCriteria(session);
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int totalCount = d_uy;-3
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((Integer) criteria.setProjection(Projections.rowCount $k ma#7
1Q SIZoK7
()).uniqueResult()).intValue(); yV/ J(
criteria.setProjection j>xVy]v= |
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(null); NE3wui1 V
List items = P|4E1O
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criteria.setFirstResult(startIndex).setMaxResults rfRo*u2"
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(pageSize).list(); }+
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PaginationSupport ps = >iH).:j
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new PaginationSupport(items, totalCount, pageSize, AvE^
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startIndex); id+m[']+
return ps; 4AOS}@~W
} Czr4
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}, true); W 8$=a
} g[au-.:
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public List findAllByCriteria(final BhW]Oq&
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DetachedCriteria detachedCriteria){ W}k?gg=
return(List) getHibernateTemplate X/-KkC
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().execute(new HibernateCallback(){ qM>OE8c#/
publicObject doInHibernate mK40 f
f=_?<I{
(Session session)throws HibernateException { |M<.O~|D6}
Criteria criteria = U.Chf9a-
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detachedCriteria.getExecutableCriteria(session); EO/cW<uV'
return criteria.list(); +<\cd9
} "gN* J)!x
}, true); J)8pqa
} {<}I9D5
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public int getCountByCriteria(final 39T&c85
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DetachedCriteria detachedCriteria){ r,.95@
Integer count = (Integer) j+13H+dN
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getHibernateTemplate().execute(new HibernateCallback(){ h w ;d m
publicObject doInHibernate /cL9?k;o
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(Session session)throws HibernateException { 9(^X2L&Z
Criteria criteria = Og$eQS
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detachedCriteria.getExecutableCriteria(session); VJl &Bq+
return +<!)k?
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criteria.setProjection(Projections.rowCount P96Cw~<Q?
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()).uniqueResult(); y13CR2t6
} D)*_{
}, true); F`;TU"pDf
return count.intValue(); g~Nij~/
} 1FD7~S|
} nXM9Px!
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用户在web层构造查询条件detachedCriteria,和可选的 [I++>4
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 iO?gF
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PaginationSupport的实例ps。 SrQ4y`?
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ps.getItems()得到已分页好的结果集 2pxWv
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ps.getIndexes()得到分页索引的数组 rY[3_ NG%
ps.getTotalCount()得到总结果数 hpqHllL
ps.getStartIndex()当前分页索引 ,NaV
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ps.getNextIndex()下一页索引 n~"g'Y
ps.getPreviousIndex()上一页索引 EbBv}9g
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 =e-a&Ep-z
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 (sV]UGrZ
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一下代码重构了。 .fLiX x
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我把原本我的做法也提供出来供大家讨论吧: x%IXwP0
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首先,为了实现分页查询,我封装了一个Page类: 0,1L e$)6
java代码: @wYQLZ
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/*Created on 2005-4-14*/ ONr?.MJ6j
package org.flyware.util.page; :>tF_6
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/** *c~'0|r
* @author Joa KD,^*FkkL
* AMh37Xo
*/ G_2gKkIK-
publicclass Page { DGa#d_I
~J:$gu~`
/** imply if the page has previous page */ {dy`
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privateboolean hasPrePage; -A~;MGY
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/** imply if the page has next page */ a!c/5)v(
privateboolean hasNextPage; eEW roF
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/** the number of every page */ E(aX4^]g
privateint everyPage; " ;-{~
*/%$6s~
/** the total page number */ $I)Tk`=
privateint totalPage; V!pq,!C$v
gD,YQ%aq
/** the number of current page */ oglXW8
privateint currentPage; RR[)UQ
i$`|Y*
/** the begin index of the records by the current P;)2*:--)
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query */ mC*W2#1pF
privateint beginIndex; S F&M
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/** The default constructor */ [ -9)T
public Page(){ V9 +xL 1U#
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} W; 3
R;
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/** construct the page by everyPage "jl1.Ah
* @param everyPage {&\J)oZ
* */ @K,2mhE~h
public Page(int everyPage){ pTa'.m
this.everyPage = everyPage; \b_-mnN"
} im_w+h%^
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/** The whole constructor */ ~I8v5 H
public Page(boolean hasPrePage, boolean hasNextPage, MAuM)8_P/|
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S`pF7[%rp
int everyPage, int totalPage, !6XvvTs/<
int currentPage, int beginIndex){ t Y:G54d=_
this.hasPrePage = hasPrePage; hrJ$%U
this.hasNextPage = hasNextPage; +L`V[;
this.everyPage = everyPage; B8bvp:Ho|
this.totalPage = totalPage; iyA*JCD
this.currentPage = currentPage; 4/*]`
this.beginIndex = beginIndex; bh= \
} Kwy1SyU
3q'K5}
_
/** +O|_P`HBoI
* @return ]}nu9z<
* Returns the beginIndex. v
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*/ EHH|4;P6
publicint getBeginIndex(){ IT8B~I\OY
return beginIndex; QT`fix{
} pu\b`3C(
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/** ?~F]@2)5w
* @param beginIndex 2"T8^r|U
* The beginIndex to set. &FL%H;Kfx
*/ k)$iK2I
publicvoid setBeginIndex(int beginIndex){ IL!BPFG w
this.beginIndex = beginIndex; Tx y]"_
} yQu vW$
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/** P/FrE~
* @return MB}:GY?
* Returns the currentPage. .(`(chRa}
*/ cj$,ob&DX
publicint getCurrentPage(){ -0A@38, }
return currentPage; Y Eg
.
} 6tOP}X
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/**
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* @param currentPage o:Ln._bj
* The currentPage to set. RM)1*l`!E
*/
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publicvoid setCurrentPage(int currentPage){ Sv.KI{;v$
this.currentPage = currentPage; \z2vV+f
} y' 2<qj
cge-'/8w%
/** vad|Rp l
* @return Zn?8\
* Returns the everyPage. }phz7N9
*/ 'g. :MQ8
publicint getEveryPage(){ 8r2XGR
return everyPage; ,yTN$K%M
} {\P?/U6~f
q A.+U:I8
/** |c<XSX?ir
* @param everyPage CKJAZ 2
* The everyPage to set. 4#TnXxL
*/ w#W5}i&x
publicvoid setEveryPage(int everyPage){ .=?Sz*3
this.everyPage = everyPage; @8|~+y8,
} H!p!sn
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/** |d5ggf.w
* @return Q%rVo4M#2
* Returns the hasNextPage. k"t>He
*/ C,[L/!
publicboolean getHasNextPage(){ P~&O4['<
return hasNextPage; TLy;4R2Nn
} &q.)2o#Q.
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/** x]H3Y3
* @param hasNextPage ^GN5vT+:'
* The hasNextPage to set. `hzd|GmX
*/ 2K
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publicvoid setHasNextPage(boolean hasNextPage){ 'zE:
fLo
this.hasNextPage = hasNextPage; 6KVV z/
} ki#y&{v9Be
K/DH
/
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/** XnD0eua#
* @return 5Qb;2!
* Returns the hasPrePage. Pv#KmSA9
*/ 6s'[{Ov
publicboolean getHasPrePage(){ VZ;@S3TS
return hasPrePage; O)l%OOv
} %j%%Rn
6{L F-`S%
/** d"Bo8`_
* @param hasPrePage
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* The hasPrePage to set. ?%93b ,7
*/ (WJV.GcP1
publicvoid setHasPrePage(boolean hasPrePage){ n>n"{!
this.hasPrePage = hasPrePage; EVWA\RO'\
} ?b5H
2W
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/** }&mj.hGv
* @return Returns the totalPage. {798=pC<.
* AYt*'Zeg!s
*/ ;jF%bE3
publicint getTotalPage(){ iL+y(]
return totalPage; r9<V%PHv
} fa"\=V2S
ZH% we
/** Ohc^d"[7
* @param totalPage K@HLIuz4t
* The totalPage to set. W.IH#`-9E
*/ cFw3Iw"JJ
publicvoid setTotalPage(int totalPage){ B+|IZoR
this.totalPage = totalPage; 2f `&WUe
} -W9gH
g2A"1w<-AH
} ci;&CHa
jBS'g{y-!
Ny]lvgu9X
r-*l1([eW
%S c=_%6
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 1PmX."a
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个PageUtil,负责对Page对象进行构造: ::ri3Tu
java代码: O6/xPeak
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/*Created on 2005-4-14*/ &u("|O)w$
package org.flyware.util.page; sLNNcj(Cy>
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import org.apache.commons.logging.Log; V>AS%lXj
import org.apache.commons.logging.LogFactory;
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/** ~C0Pu.{o
* @author Joa L -YNz0A
* L(;.n>/
*/ vABXXB
publicclass PageUtil { =Aj"j-r&{
% oR>Uo
privatestaticfinal Log logger = LogFactory.getLog M= atls
u"\=^F
(PageUtil.class); x+K gc[r
UP R/XQ
/** %iX/y
* Use the origin page to create a new page h>| g2h
* @param page N70zjy4?fL
* @param totalRecords CGkI\E
* @return 'P,,<nkr|
*/ ?/)lnj)e{
publicstatic Page createPage(Page page, int u|T%Xy=LU
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totalRecords){ UUGe"]V^g:
return createPage(page.getEveryPage(), YlrB@mE0n$
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page.getCurrentPage(), totalRecords); 6A.P6DW
} {79qtq%W{
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/** vn ``0!FX
* the basic page utils not including exception (m/aV
4
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handler &/iFnYVhy
* @param everyPage Z~_8P
* @param currentPage g9`[Y~
* @param totalRecords YQ+^
* @return page loBtd%wY
*/ TH YVT%v
publicstatic Page createPage(int everyPage, int @"w2R$o
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currentPage, int totalRecords){ ex!XB$X
everyPage = getEveryPage(everyPage); xb]odYGdW
currentPage = getCurrentPage(currentPage); V!W1fb7V
int beginIndex = getBeginIndex(everyPage, (2d3jQN`
LfHzT<)|
currentPage); J$rJd9t
int totalPage = getTotalPage(everyPage, W~<m[#:6C
R2CQXhiJ
totalRecords); \@8*T S
boolean hasNextPage = hasNextPage(currentPage, ?d~]Wd !z
4
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totalPage); Oi6Eo~\f
boolean hasPrePage = hasPrePage(currentPage); 5tMh/]IeS
b9DR%hO:
returnnew Page(hasPrePage, hasNextPage, }I]W'<jY
everyPage, totalPage, ifvU"l
currentPage, E0<)oQ0Xa>
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beginIndex); zA,/@/'(
} s%^o*LQ|9
(![t_r0
privatestaticint getEveryPage(int everyPage){
Y<aO
return everyPage == 0 ? 10 : everyPage; o)p[
C
} gJK KR]4*
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privatestaticint getCurrentPage(int currentPage){ ^&-a/'D$,
return currentPage == 0 ? 1 : currentPage; 1|]xo3j"'
} dqxd3,Z
[g`, AmR\!
privatestaticint getBeginIndex(int everyPage, int 7=vYO|a/4
W_%W%i|
currentPage){ ^4 8\>-Q\
return(currentPage - 1) * everyPage; e"~)Utk
} wA631kr
VXwPdMy*L
privatestaticint getTotalPage(int everyPage, int ogJ<e_m
nPOO3!<{
totalRecords){ 3}j1RYtz
int totalPage = 0; xHe^"LL
VGB-h'
if(totalRecords % everyPage == 0) VKNp,Lf
totalPage = totalRecords / everyPage; `R0Y+#$8h
else vtZ?X';wh
totalPage = totalRecords / everyPage + 1 ; >D~w}z/fk
1AT'S;`
return totalPage; pqH4w(;
} "$DldHC
c|Y!c!9F
privatestaticboolean hasPrePage(int currentPage){ R^6Zafp
return currentPage == 1 ? false : true; Mi?}S6bp
} m:3J!1
S/fW/W*/}
privatestaticboolean hasNextPage(int currentPage, CL1
oAk
[%?y( q
int totalPage){ 2uL9.q
return currentPage == totalPage || totalPage == `s%QeAde
/ gu3@@h
0 ? false : true; !UcOl0"6
} kW+G1|
).Gd1pE
O_AGMW/2+
} <sc\EK
x6%#wsvS
{xToz]YA
JhJLqb@q
$_FZn'Db6
上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 rVcBl4&1*g
V^2-_V]8
面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 wVE:X3Ei
M~p=#V1D
做法如下: (Q_2ODKo
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 K$ AB} Fvc
1`QsW&9=b
的信息,和一个结果集List: lQL:3U0DjU
java代码: tr=@+WHp
gz4UV/qr/
d;44;*D
/*Created on 2005-6-13*/ a:b^!H>#
package com.adt.bo; M(2`2-/xh
mW +tV1XjG
import java.util.List; .8(%4ejJ(
;UpJ=?W
import org.flyware.util.page.Page; :Eo8v$W\RB
/>F.Nsujy
/** Hk9U&j$
* @author Joa T>F9Hs W
*/ /AR]dcL@76
publicclass Result { D%gGRA
az2Xch]
private Page page; 0m&3?"5u
,E9d\+j
private List content; anC+r(jjg9
eO[c l B
/** o|rzN\WJn
* The default constructor !M^\f
N1
*/ F~R7~ZE
public Result(){ 7kd|K
b(
super(); OD|1c6+X
} ,ux+Qz5(
]7vf#1i<
/** 7=3O^=Q^Q
* The constructor using fields hy!6g n
* n| C|&
* @param page agT7=hX].
* @param content Q7(eq0na
*/ CjKRP;5
public Result(Page page, List content){ ?bI?GvSh
this.page = page; J3IRP/*z
this.content = content; '\t7jQ
} O]ZC+]}/
q~O>a0f0
/** 75AslL?t
* @return Returns the content. 61|B]ei/
*/ mf2Mx=oy
publicList getContent(){ -l[jEJS}
return content; (}jL_E
} <+q$XL0
enumK\
/** |^iA6)Q
* @return Returns the page. y\z > /q
*/ 6#|qg*OS
public Page getPage(){ >qpqQ;
bm
return page; 8Zw]f-5x\
} ;($1Z7j+
wT/6aJoX
/** ]/44Ygz/
* @param content
iRs V#s
* The content to set. Bc[6*Y,%T
*/ M2p<u-6
"
public void setContent(List content){ Rcf=J){D6
this.content = content; G#lg|# -#
} X+at%L=
'=#5(O%pp
/** O9e.=l
* @param page Abf1"#YImy
* The page to set. >[Rz
<yv
*/ VDa|U9N
publicvoid setPage(Page page){ T V;BNCg
this.page = page; TvM24Orct
} Sn ^Aud
} [+gzdLad
l&|)O6N
&k+*3.X
ev"M;"y
r=$gT@
2. 编写业务逻辑接口,并实现它(UserManager, WIG=D{\Yx
Tq#<Po $
UserManagerImpl) =G>.-Qfs
java代码: ?K<ZkYw?
"mtp0
fYn{QS?
/*Created on 2005-7-15*/ QS;F+cmTh
package com.adt.service; B{PLIisc
9P0yv3
import net.sf.hibernate.HibernateException; Pgev) rh[
/RqhykgZ
import org.flyware.util.page.Page; l5HWZs^
HlRAD|]\
import com.adt.bo.Result; oLP]N$'#
>h%\HMKk
/** y\Dn^
* @author Joa S+pP!YX
*/ \xeVDKJH+n
publicinterface UserManager { k/bque
6w!e?B2/%
public Result listUser(Page page)throws !-RwB@\
!7c'<[+Hm
HibernateException; |[ocyUsxX
`j:M)2:*y
} W>:kq_gT
A$<>JVv
pyF5S,c
XN(tcdCG
>2Ca5C
java代码: s|gp
gIBpOPr^d
)UP8#|$#T
/*Created on 2005-7-15*/ )-q\aX$])
package com.adt.service.impl; c _mq
iokPmV
import java.util.List; HtUG#sc&`{
,ey0:.!;
import net.sf.hibernate.HibernateException; z{M8Yf |
B@-"1m~la?
import org.flyware.util.page.Page; !;+U_j'Pg
import org.flyware.util.page.PageUtil; (H1lqlVWV#
sX5sL
import com.adt.bo.Result; IXJ6PpQLv
import com.adt.dao.UserDAO; 8nsZ+,@+[
import com.adt.exception.ObjectNotFoundException; ]738Z/)^
import com.adt.service.UserManager; 3cHtf
uP Rl[tS0
/** gY%&IHQ'
* @author Joa x
^[F]YU
*/ 4oN${7k0
publicclass UserManagerImpl implements UserManager { v~`*(Hh
ALAL( f`
private UserDAO userDAO; 6g|#ho1Bbs
pw;r 25
/** f8#*mQ
* @param userDAO The userDAO to set. $`v+4]
*/ :ol6%Z's
publicvoid setUserDAO(UserDAO userDAO){ )Oe`s(O@[I
this.userDAO = userDAO; N33AcV!*8
} 6? !I
X(b1/lzA
/* (non-Javadoc) R=Ymo.zs6
* @see com.adt.service.UserManager#listUser 5v3RVaqZ
O8[k_0@
(org.flyware.util.page.Page) 6y9C@5p}B
*/ u?Z
<n:
public Result listUser(Page page)throws `I{ tZ$iD
?U JSxL
HibernateException, ObjectNotFoundException { ?~ ?Hdv
int totalRecords = userDAO.getUserCount(); ssT@<Tk^4
if(totalRecords == 0) n.I2$._(b
throw new ObjectNotFoundException ?$16A+
`[bJYZBc2
("userNotExist"); (Z
8,e
page = PageUtil.createPage(page, totalRecords); lvx]jd\
List users = userDAO.getUserByPage(page); c>rKgx
returnnew Result(page, users); IhwN],-V
} 2!idy]vy_
P>fKX2eQ-
} Wz5=(<{S
-_HRqw,Z0
j9>TTgy@
wB2}uk7
=+4 _j
其中,UserManagerImpl中调用userDAO的方法实现对User的分页查 Hh@2 m\HA
"4RQ`.SR
询,接下来编写UserDAO的代码: }>,CUz
3. UserDAO 和 UserDAOImpl: .8x@IWJD
java代码: D!/0c]"
#EFMgQO
fzyzuS$
/*Created on 2005-7-15*/ AygvJeM_W
package com.adt.dao; $NdH*
R|-j]Ne
import java.util.List; V pH|R
*k4+ioFnKE
import org.flyware.util.page.Page; L W?&a3e
A9iQ{l
import net.sf.hibernate.HibernateException; _{mJ.1)V;
!")WZq^`
/** pkW5D
* @author Joa VW~Xbyf
*/ VRB~7\A5<)
publicinterface UserDAO extends BaseDAO { xRB7lV*
ivD^HhG
publicList getUserByName(String name)throws $Ba`VGP>)3
x*J|i4
HibernateException; Y6a$gXRT
lU&Q^Zj`
publicint getUserCount()throws HibernateException; El+Ft.7
99EX8
publicList getUserByPage(Page page)throws :cb[M5c
97(n\Wt2
HibernateException; W%WC(/hor
fSr`>UpxC
} ^^eV4Y5`+
jQkUNPHu
}I)z7l.
pKnIQa[c
l:x_j\
java代码: VT
Vm7l
9GaL0OWo
{n6\g]p3
/*Created on 2005-7-15*/ mgxz1d
package com.adt.dao.impl; {RH*8?7
' Nw6.5
import java.util.List; @EYK(QS-
(]}XLMi,|!
import org.flyware.util.page.Page; $M-NR||k
Z<I[vp6{
import net.sf.hibernate.HibernateException; 8| Sba<d
import net.sf.hibernate.Query; ZRUh/<\[
[C2kK *JZ
import com.adt.dao.UserDAO; }pt-q[s>
J7_8$B-j7
/** c9|I4=_K
* @author Joa zQn//7#-G
*/ 1aVgwAI
public class UserDAOImpl extends BaseDAOHibernateImpl ThbP;CzI#
sC9-+}
implements UserDAO { We|-5
[1mIdwS
/* (non-Javadoc) bIq-1
Y(
* @see com.adt.dao.UserDAO#getUserByName <jg8y'm@0
z}D#WWSxf
(java.lang.String) @|Z*f\
*/ yTP[,bM
publicList getUserByName(String name)throws FRc |D
8dlInms
HibernateException { aK!xRnY
String querySentence = "FROM user in class +B](5 z4
"\}21B~{7'
com.adt.po.User WHERE user.name=:name"; ]gEu.Nth`
Query query = getSession().createQuery ipfm'aQ
T4l-sJ'|
(querySentence); k -io$
query.setParameter("name", name); yB|]LYh
return query.list(); |HNQ|r_5S
} p
FXd4*
~T;K-9R
/* (non-Javadoc) X4XFu
* @see com.adt.dao.UserDAO#getUserCount() e
W9)@nVJ
*/ ~>4@;
publicint getUserCount()throws HibernateException { t&8<k+m
int count = 0; G[vUOEU~O
String querySentence = "SELECT count(*) FROM a
pKa4nI
g<0w/n!jmC
user in class com.adt.po.User"; W6)dUi
:"
Query query = getSession().createQuery C5BzWgK
G#^m<G^M
(querySentence); anpJAB:1
count = ((Integer)query.iterate().next 7=L:m7T
-`,~9y;tx
()).intValue(); C:WtCAm(
return count; \\y}DNh
} SIj6.RK
iZsau2K
/* (non-Javadoc) #/\pUK~km
* @see com.adt.dao.UserDAO#getUserByPage u!m,ilAnd
PXOq#
(org.flyware.util.page.Page) ?G2qlna
*/ |zK!+fu
publicList getUserByPage(Page page)throws lR|$*:+
6JUav."`~
HibernateException { 3we.*\2$
String querySentence = "FROM user in class jq7vOr-_g
(N&k}CO]W
com.adt.po.User"; /QV [N
Query query = getSession().createQuery 'O!Z:-qE
X}_QZO=z
(querySentence); 8}ii3P y
query.setFirstResult(page.getBeginIndex()) p)K9ZI
.setMaxResults(page.getEveryPage()); D!81(}p
return query.list(); v$qpcu#o
} bM*Pcxv
/e;e\k_}'
} BDarJY
`;zu1o
eTLI/?|+N
i528e{&
_%AJmt}
至此,一个完整的分页程序完成。前台的只需要调用 Wm];p qN
d#X&Fi
userManager.listUser(page)即可得到一个Page对象和结果集对象 <