Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 DwQaj"1<%
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 2n9E:tc
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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 q{rc[ s?
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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 D]I]I!2c
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分页支持类: B{D!5{t
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java代码: C$Y pk\p
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package com.javaeye.common.util; BjT0mk"P
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import java.util.List; >3S^9{d
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publicclass PaginationSupport { _;A?w8z
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publicfinalstaticint PAGESIZE = 30; zLG5m]G4D
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privateint pageSize = PAGESIZE; y6[^I'kz
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privateList items; Eua\N<!aai
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privateint totalCount; zuWfR&U|W
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privateint[] indexes = newint[0]; xK`.^W
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privateint startIndex = 0; _&/FO{ F@m
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public PaginationSupport(List items, int zU+` o?al
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totalCount){ k$V.hG|6M
setPageSize(PAGESIZE); &ZjQa.-U>
setTotalCount(totalCount); pg}9baW?
setItems(items); H8>u:
setStartIndex(0); EDm,Y
} kEM5eY
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public PaginationSupport(List items, int /Z:\=0`
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totalCount, int startIndex){ [:HT=LX3
setPageSize(PAGESIZE); k^|P8v+"D
setTotalCount(totalCount); =6mnXpM.
setItems(items); >L#HE
setStartIndex(startIndex); \O"EK~x}/
} /4\!zPPj.
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public PaginationSupport(List items, int oGzZ.K3 A
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totalCount, int pageSize, int startIndex){ S`LS/)
setPageSize(pageSize); bDLPA27
setTotalCount(totalCount); }gE?ms4$
setItems(items); oG! S(95
setStartIndex(startIndex); G22=8V
} * /S=9n0
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publicList getItems(){ 1/t}>>,M
return items; J%?'Q{
} @"jV^2oY1
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publicvoid setItems(List items){ f
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this.items = items; H];QDix?
} yNk9KK )
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publicint getPageSize(){ :*wnO;eN
return pageSize; mVYLI!n}0#
} 4\%0a,\^
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publicvoid setPageSize(int pageSize){ p]d3F^*i
this.pageSize = pageSize;
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} fJ[(zjk
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publicint getTotalCount(){ M1Jnn4w*d
return totalCount; \R>!HY
} [.}-n AN
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publicvoid setTotalCount(int totalCount){ tUXq!r<'dT
if(totalCount > 0){ 3|/<Pk
this.totalCount = totalCount; 'F'v/G~F
int count = totalCount / `P&L. m]|
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pageSize; sR`WV6!9
if(totalCount % pageSize > 0) "{0
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count++; p[*NekE6-
indexes = newint[count]; +tz^ &(
for(int i = 0; i < count; i++){ o=`FGowF
indexes = pageSize * W
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} ;!(.hCHvr
}else{ VWoxi$3v
this.totalCount = 0; I|=$.i
} t:m2[U_}
} Wq!n8O1
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publicint[] getIndexes(){ ~
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return indexes; xF*C0B;QL
} @0`Q
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publicvoid setIndexes(int[] indexes){ 2M>Y3Q2Yv
this.indexes = indexes; 5b_[f(
} vb{+yEa
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publicint getStartIndex(){ {0fQ"))"
return startIndex; n/_cJD\
} 0zg\thL
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publicvoid setStartIndex(int startIndex){ 28L3"c
if(totalCount <= 0) PjEKZHHz
this.startIndex = 0; gIR{!'
elseif(startIndex >= totalCount) Yt"&8N]
this.startIndex = indexes ~%9ofXy
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[indexes.length - 1]; #`6A}/@.+
elseif(startIndex < 0) ,*fvA?
this.startIndex = 0; EQ&E C
else{ <tZPS`c'_
this.startIndex = indexes 1MdVWFKXV
\*#9Ry^f
[startIndex / pageSize]; QE7
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} >= Hcw
} 36D-J)-Z
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publicint getNextIndex(){ X*Mw0;+T
int nextIndex = getStartIndex() + rJJI<{$
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pageSize; ^'DrU<o
if(nextIndex >= totalCount) 24 S,w>j
return getStartIndex(); 'z\K0
else J;Az0[qMR
return nextIndex; #2c-@),
} 5-|fp(Ww_W
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publicint getPreviousIndex(){ =4
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int previousIndex = getStartIndex() - (S+tQ2bt
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pageSize; P)~PrTa%
if(previousIndex < 0) 8o~<\eF%
return0; Ek'
else iq`y
return previousIndex; 9viQ<}K<
} r=dFk?8XbC
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} uY;-x~Z
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抽象业务类 EAq/Yw2$
java代码: LV{a^!f`y
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/** z#b31;A@$
* Created on 2005-7-12 Gnmj-'x
*/ 6C>x,kU
package com.javaeye.common.business; 9 ="i'nYp
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import java.io.Serializable; :Vq gmn
import java.util.List; M:h~;+s
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import org.hibernate.Criteria; v"Bv\5f,Ys
import org.hibernate.HibernateException; v`B7[B4K3
import org.hibernate.Session; b9HE #*d,
import org.hibernate.criterion.DetachedCriteria; Owalt4}C
import org.hibernate.criterion.Projections; +vfk+6
import NL))!Pi
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org.springframework.orm.hibernate3.HibernateCallback; VF=$'Bl|
import dI&2dcumS
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org.springframework.orm.hibernate3.support.HibernateDaoS <2w@5qL
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upport; N4"%!.Y
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import com.javaeye.common.util.PaginationSupport; ,WbO8#z+
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public abstract class AbstractManager extends .EGZv(rz&
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HibernateDaoSupport { !G3O!]
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privateboolean cacheQueries = false; `bO+3Y'5
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privateString queryCacheRegion; ^lB'7#7
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publicvoid setCacheQueries(boolean $Y][-8{t
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cacheQueries){ <R}(UK
this.cacheQueries = cacheQueries; [|V<e+>T/
} +2`RvQN
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publicvoid setQueryCacheRegion(String v#:#w.]-Y
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queryCacheRegion){ yWu80C8q
this.queryCacheRegion = T>d-f=(9KH
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queryCacheRegion; ~P|YAaFx
} I(ds]E
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publicvoid save(finalObject entity){ 3t[2Bd
getHibernateTemplate().save(entity); -uenCWF\#
} w<N[K>
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publicvoid persist(finalObject entity){ Ll lyx20U
getHibernateTemplate().save(entity); U,Nf&g
} Q&^ti)vB
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publicvoid update(finalObject entity){ rC}r99Pe:x
getHibernateTemplate().update(entity); YY{S0jnhF
} FkR9-X<
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publicvoid delete(finalObject entity){ =yOIP@
getHibernateTemplate().delete(entity); "n:z("Q*
} >}GtmnF
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publicObject load(finalClass entity, wgpu]ooUF&
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finalSerializable id){ Ki{&,:@
return getHibernateTemplate().load Uaog_@2n,
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(entity, id); B.6gJ2c
} 2ksX6M3kY
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publicObject get(finalClass entity, ]wWN~G)2lV
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finalSerializable id){ *xA&t)z(i
return getHibernateTemplate().get R
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(entity, id); ZJ'#XZpr
} Eic/#j{4
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publicList findAll(finalClass entity){ kJq8"Klg
return getHibernateTemplate().find("from L;H(I@p(e
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" + entity.getName()); |"?0H#
} F#eZfj~
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publicList findByNamedQuery(finalString 'J#u;KJ
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namedQuery){ i-~HT4iw
return getHibernateTemplate z{Z'2 ,#
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().findByNamedQuery(namedQuery); {<o_6 z`$
} yNi/JM
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publicList findByNamedQuery(finalString query, fI;6!M#
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finalObject parameter){ 7'z{FSS
return getHibernateTemplate puA~}6C
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().findByNamedQuery(query, parameter); k?3NF:Yy7
} d4t%/ Uh
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publicList findByNamedQuery(finalString query, }p$>V,u
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finalObject[] parameters){ xDG8C39qrs
return getHibernateTemplate [U.3rcT"N
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().findByNamedQuery(query, parameters); wZ6LiYiHl
} _so\h.lt
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publicList find(finalString query){ ~cQ./G4
return getHibernateTemplate().find FM$XMD0=
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(query); 2'Cwx-_G`
} .;)7)%
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publicList find(finalString query, finalObject RTHD2
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parameter){ SB0Cq
return getHibernateTemplate().find S\b[Bq
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(query, parameter); K?o( zh;
} rrbD0UzFA
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public PaginationSupport findPageByCriteria WcqQR))n
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(final DetachedCriteria detachedCriteria){ N}Q%y(O^
return findPageByCriteria 0Am&:kX't
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); m1H_kJ
} b6Pi:!4
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public PaginationSupport findPageByCriteria _ dEc? R}
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(final DetachedCriteria detachedCriteria, finalint /I}#0}
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startIndex){ PKFjM~J
return findPageByCriteria Evu`e=LaG
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(detachedCriteria, PaginationSupport.PAGESIZE, KM
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startIndex);
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} ea[vzD]
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public PaginationSupport findPageByCriteria @a2n{
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(final DetachedCriteria detachedCriteria, finalint 4Bg"b/kF
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pageSize, " O0p.o
finalint startIndex){ }zC9;R(E
return(PaginationSupport) U|SF;T
.
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getHibernateTemplate().execute(new HibernateCallback(){ 2q]y(kW+
publicObject doInHibernate ,yc_r=_
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(Session session)throws HibernateException { Cge@A'2
Criteria criteria = GPV=(}z
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detachedCriteria.getExecutableCriteria(session); =`Ii?xo
int totalCount = z7TMg^9#
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((Integer) criteria.setProjection(Projections.rowCount 8'XAZSd(
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()).uniqueResult()).intValue(); v2eLH:6
criteria.setProjection :jL>sGvBv
q[?xf3
(null); h [*/Tnr
List items = t Sibzl~
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criteria.setFirstResult(startIndex).setMaxResults fghw\\]3
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(pageSize).list(); g{PEplk
PaginationSupport ps = M;2@<,rM
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new PaginationSupport(items, totalCount, pageSize, eka<mq|W
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startIndex); >^Rkk{cc
return ps; 5<64 C}fE3
} ozaM!e e\z
}, true); PU8>.9x
} u%m,yPU~B
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public List findAllByCriteria(final fh%|6k?#M
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DetachedCriteria detachedCriteria){ WSEw:pln
return(List) getHibernateTemplate hK]mnA[Y
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().execute(new HibernateCallback(){ Y#e,NN
publicObject doInHibernate 2F7( Y)
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(Session session)throws HibernateException { 6_mkt|E=
Criteria criteria = i?{)o]i
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detachedCriteria.getExecutableCriteria(session); jxc^OsYj
return criteria.list(); _:+hB9n s
} *Aqd["q
}, true); L(RI4d
} KBC?SxJSJc
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public int getCountByCriteria(final ?Vre"6U
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DetachedCriteria detachedCriteria){ z]+&kNm
Integer count = (Integer) x-nO; L-2p
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getHibernateTemplate().execute(new HibernateCallback(){ jK^Q5iD
publicObject doInHibernate Rf4}((y7Y\
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(Session session)throws HibernateException { k~%j"%OB
Criteria criteria =
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detachedCriteria.getExecutableCriteria(session); bZ0{wpeK=
return &9Kni/
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criteria.setProjection(Projections.rowCount }INj~d<:
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()).uniqueResult(); gpw,bV
} OLS/3c
z
}, true); X
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return count.intValue(); ;kDUQw
} \>$3'i=mQ
} /hN;\Z[@
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用户在web层构造查询条件detachedCriteria,和可选的 &+5ij;AD
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 b#nI#!p'
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PaginationSupport的实例ps。 $c{fPFe-
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ps.getItems()得到已分页好的结果集 g@2KnzD
ps.getIndexes()得到分页索引的数组 E1j3c
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ps.getTotalCount()得到总结果数 9?iA~r|+
ps.getStartIndex()当前分页索引 5szJ.!(
ps.getNextIndex()下一页索引 \
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ps.getPreviousIndex()上一页索引 $35C1"
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 S]&:R)#@
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 {'p <
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一下代码重构了。 p#%*z~ui
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我把原本我的做法也提供出来供大家讨论吧: fK^W6)uuV
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首先,为了实现分页查询,我封装了一个Page类: #w3J+U 6r
java代码: < 1%}8t"
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/*Created on 2005-4-14*/ k!ID
package org.flyware.util.page; oJZxRm[g$t
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/** to'CuPkT
* @author Joa ypgM&"eR
* Uc,MZV4
*/ 0xx4rpH
publicclass Page { <+-=j
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/** imply if the page has previous page */ q9wObOS$
privateboolean hasPrePage; *c\XQy
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/** imply if the page has next page */ 's.e"F#
privateboolean hasNextPage; NB4Q,iq$
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/** the number of every page */ K {kd:pr
privateint everyPage; "=w:LRw
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/** the total page number */ NLr a"Z
privateint totalPage; ^Ze(WE)
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/** the number of current page */ qm"SN<2S*
privateint currentPage; ;mYZ@g%e
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/** the begin index of the records by the current jEE!H/
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query */ twu,yC!
privateint beginIndex; aAbA)'G
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/** The default constructor */ m_;fj~m
public Page(){ soLW'8
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} {i+
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/** construct the page by everyPage HUMy\u84H
* @param everyPage gV-*z}`U
* */ q1q9W@H
public Page(int everyPage){ gs3c1Qa3b
this.everyPage = everyPage; pSb tm74
} 'pT13RFD
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/** The whole constructor */ Yn[>Y)
public Page(boolean hasPrePage, boolean hasNextPage, c9G%;U)
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$ OG){'X
int everyPage, int totalPage, ,oUzaEX
int currentPage, int beginIndex){ Z.&/,UU:4
this.hasPrePage = hasPrePage; @dk-+YxG
this.hasNextPage = hasNextPage; h
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this.everyPage = everyPage; +SF+$^T
this.totalPage = totalPage; '#yqw%
this.currentPage = currentPage; >DUTmJxv
this.beginIndex = beginIndex; er5!ne
} UOFb.FRP>
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/** ;:_AOb31N
* @return J;NIa[a
* Returns the beginIndex. KJV8y"^=Q
*/ 2F>Y{3&
publicint getBeginIndex(){ [|ZFei)r
return beginIndex; yuy\T(7BN
} \I:27:iAL
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/** Pn^ `_
* @param beginIndex sQ340!
* The beginIndex to set. aoZ |@x
*/ g<(!>:h
publicvoid setBeginIndex(int beginIndex){ 0VcHz$
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this.beginIndex = beginIndex; "b~C/-W I
} }A+ncabm
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/** \c<;!vkZ04
* @return pHoHngyi&
* Returns the currentPage. %'ah,2a%
*/ nhdZC@~E0
publicint getCurrentPage(){ -N% V5 TN
return currentPage; hcj]T?
} 6i-G{)=l
T 5Zh2Q@
/** /6Q]f
* @param currentPage "o+?vx-
* The currentPage to set. .n1&Jsey
*/ g=[OH
publicvoid setCurrentPage(int currentPage){ %SOXw8-
this.currentPage = currentPage; r@}`Sw]@
} >zqaV@T
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/** BK%.wi
* @return `@
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* Returns the everyPage. sBB[u'h!
*/ ?tY+P`S
publicint getEveryPage(){ u>)h
return everyPage; 2zqaR[C
} l>K+4
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/** <wk
* @param everyPage 6`O,mpPu4G
* The everyPage to set. ru@#s2
*/ PkrVQH9^w
publicvoid setEveryPage(int everyPage){ #?Kw
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this.everyPage = everyPage; 0:
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} $*942. =Q
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/** :-}K:ucaj
* @return b"A,q
* Returns the hasNextPage. 0t?o6e
*/ k7Bh[ ..!
publicboolean getHasNextPage(){ )`rD]0ua;
return hasNextPage; I4G0!"T+
} LWv<mtuYf
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/** T8a' 6otc
* @param hasNextPage y<kUGsD
* The hasNextPage to set. &'$Bk5 D@G
*/ ,Q56A#Y\
publicvoid setHasNextPage(boolean hasNextPage){ @KK6Jy OTQ
this.hasNextPage = hasNextPage; {/]2~!
} R|8vdZ%@
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/** `jGeS[FhR
* @return
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* Returns the hasPrePage. GMJ4v S
*/ 0TmEa59P
publicboolean getHasPrePage(){ $KYGQP
return hasPrePage; WVRIq'
} >t3_]n1e
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