Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 v!#koqd1y.
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 |$[.X3i
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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 8peK[sz
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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 *JO%.QNg
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分页支持类: Ue=1NnRDkA
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java代码: [f?x,W~
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package com.javaeye.common.util; b@B\2BT
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import java.util.List; OpmPw4?}
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publicclass PaginationSupport { 10tt' :
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publicfinalstaticint PAGESIZE = 30; /}(\P@Z
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privateint pageSize = PAGESIZE; ufN`=IJ%
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privateList items; b<BkI""b
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privateint totalCount; LAuaowE\v
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privateint[] indexes = newint[0]; o`nJJ:Cxq-
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privateint startIndex = 0; H<
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public PaginationSupport(List items, int fo e)_
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totalCount){ JTTI`b2l_
setPageSize(PAGESIZE); ^39?@xc@
setTotalCount(totalCount); G%T<wKD<
setItems(items); Bpv"qU7
setStartIndex(0); gH0Rd
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} [@0Hmd7
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public PaginationSupport(List items, int )H{OqZZYD
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totalCount, int startIndex){ *s?C\)x
setPageSize(PAGESIZE); yS4nB04`=
setTotalCount(totalCount); hmI>
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setItems(items); %V92q0XW
setStartIndex(startIndex); x) R4_3
} 2,p= %
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public PaginationSupport(List items, int `eKFs0M.
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totalCount, int pageSize, int startIndex){ nM`pnR_
setPageSize(pageSize); uk3PoB^>
setTotalCount(totalCount); q5.5%W
setItems(items); ^geY Ay
setStartIndex(startIndex); 5Z[HlN|-!
} $SU<KNMZ
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publicList getItems(){ zS `>65}e
return items; W\O.[7JP
} *7C l1o
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publicvoid setItems(List items){ ;JX2ebx
this.items = items; $Q`\-
} VW:Voc
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publicint getPageSize(){ 2lxA/.f
return pageSize; p e$WSS J
} L7N>p4h]Xj
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publicvoid setPageSize(int pageSize){ q^b12@.
this.pageSize = pageSize; vZIx>
} :~~\{fm
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publicint getTotalCount(){ /Tp>aW%}"
return totalCount;
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} fAD
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publicvoid setTotalCount(int totalCount){ qcfg 55]'c
if(totalCount > 0){ jNAboSf2Y
this.totalCount = totalCount; r:,"k:C
int count = totalCount / u4Z
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pageSize; <\L=F8[
if(totalCount % pageSize > 0) :D:J_{HJ
count++; ;RW5XnVx
indexes = newint[count]; dDqT#N?Y
for(int i = 0; i < count; i++){ z*WQ=l2
indexes = pageSize * XpdjWLO]C<
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} xsg55`
}else{ kj`h{Wc[)
this.totalCount = 0; T>m|C}yy
} 1fV\84m^
} -\g@s@5
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publicint[] getIndexes(){ / 16 r_l
return indexes; r,ep{
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} bJL ,pe+u
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publicvoid setIndexes(int[] indexes){ ;z9U_
this.indexes = indexes; hD7Lgi-N)W
} f1I/aR V:+
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publicint getStartIndex(){ u7
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return startIndex; 5,du2
} vH{JLN2
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publicvoid setStartIndex(int startIndex){ nc:K!7:
if(totalCount <= 0) Lasi)e=$<
this.startIndex = 0; J_&G\b.9/
elseif(startIndex >= totalCount) {Yv5Z.L&(
this.startIndex = indexes cN|
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[indexes.length - 1]; }1YQ?:@
elseif(startIndex < 0) a7e.Z9k!
this.startIndex = 0; nb(Od,L
else{ y&2O)z!B
this.startIndex = indexes ]Waa7)}DM
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[startIndex / pageSize]; M1XzA
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} *YWk.
} eX o@3/
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publicint getNextIndex(){ ^ ]SU (kY
int nextIndex = getStartIndex() + rv%^2h<&
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pageSize; K[9{]$(Z
if(nextIndex >= totalCount) 86~q pN
return getStartIndex(); G\
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else trL8oZ6
return nextIndex; 8-q4'@(
}
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publicint getPreviousIndex(){ A@n//AZM
int previousIndex = getStartIndex() - n<MreKixE
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pageSize; 8z*/J=n
if(previousIndex < 0) %>,Kd6bdg
return0; rq^VOK|L
else s@|TQ9e |j
return previousIndex; HeM-
} c4L++
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抽象业务类 'h;x>r
java代码: o*s3"Ib
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/** 7
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* Created on 2005-7-12 =%9j8wHX
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package com.javaeye.common.business; N"2P]Zr
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import java.io.Serializable; `6y\.6j
import java.util.List; axdRV1+s
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import org.hibernate.Criteria; (J`EC
import org.hibernate.HibernateException; *@[+C~U
import org.hibernate.Session; 6q~*\KRk
import org.hibernate.criterion.DetachedCriteria; CL"q"
import org.hibernate.criterion.Projections; SgY\h{{sP
import [HQ Bx`3TS
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org.springframework.orm.hibernate3.HibernateCallback; 2R`}}4<Z
import -P=Hp/ELi
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org.springframework.orm.hibernate3.support.HibernateDaoS NU!B|l
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upport; Z+C&?K
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import com.javaeye.common.util.PaginationSupport; A@JZK+WB}
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public abstract class AbstractManager extends TAZ+2S# #7
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HibernateDaoSupport { kB;!EuL
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privateboolean cacheQueries = false; FY <77i
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privateString queryCacheRegion; W&Kjh|[1QZ
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publicvoid setCacheQueries(boolean w"BMJ+
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cacheQueries){ 'A9U[|
this.cacheQueries = cacheQueries; lcEin*Oc
} Y,s@FGI2
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publicvoid setQueryCacheRegion(String =bB7$#al
}
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queryCacheRegion){ g+M& _n
this.queryCacheRegion = ,SSq4
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queryCacheRegion; K!_''Fg
} "\1QJ
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publicvoid save(finalObject entity){ t+Hx&_pMj
getHibernateTemplate().save(entity); %%f(R7n
} m6M:l"u
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publicvoid persist(finalObject entity){ ]eIV'lP,j/
getHibernateTemplate().save(entity); Q1?0]5
} y`.m'n7>P
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publicvoid update(finalObject entity){ Rz!! ;<ye8
getHibernateTemplate().update(entity); ELQc:
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} TeWpdUCO
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publicvoid delete(finalObject entity){ s+XDtO
getHibernateTemplate().delete(entity); hZNAI
} UqZ#mK i
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publicObject load(finalClass entity, f/RDo4
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finalSerializable id){ ad[oor/7|
return getHibernateTemplate().load V-TWC@Y"
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(entity, id); ,Frdi>7 ~
} )m[dfeqd +
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publicObject get(finalClass entity, 5RhP^:i@C
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finalSerializable id){ )90K^$93"
return getHibernateTemplate().get R
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(entity, id); It3.
} mY !LGN
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publicList findAll(finalClass entity){ (GI]Uyn
return getHibernateTemplate().find("from hz~jyH.h_
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" + entity.getName()); a#4 'X*
} SebJ}P1x
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publicList findByNamedQuery(finalString *oU-V#
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namedQuery){ O)Mf/P'
return getHibernateTemplate u.Z,HsEO b
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().findByNamedQuery(namedQuery); e3b|z.^ 8
} 6`l7saHXE
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publicList findByNamedQuery(finalString query, T&PLvyBL
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finalObject parameter){ =FtJa3mHK
return getHibernateTemplate K]Onb{QY
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().findByNamedQuery(query, parameter); bD;c>5t
} OlF5~VAbfb
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publicList findByNamedQuery(finalString query, F_&bE@k
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finalObject[] parameters){ v5N2$Sqp*
return getHibernateTemplate {-?8r>
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().findByNamedQuery(query, parameters); 8x9$6HO
} DTR/.Nr'K
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publicList find(finalString query){ @Xb>GPVe#L
return getHibernateTemplate().find =ykOh_M
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(query); n%YG)5;
} 1_z6O!rx
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publicList find(finalString query, finalObject 5};$>47m
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parameter){ ' N?t=A
return getHibernateTemplate().find @ dF]X
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(query, parameter); }475c{
} @lnM%
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public PaginationSupport findPageByCriteria p/f!\
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(final DetachedCriteria detachedCriteria){ j |tu|Q
return findPageByCriteria ^,M&PP6
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); j$8i!C
} "=BO,see9
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public PaginationSupport findPageByCriteria J|BZ{T}d
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(final DetachedCriteria detachedCriteria, finalint XN=Cq*3}
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startIndex){ MN22#G4j^w
return findPageByCriteria m*^|9*dIC
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(detachedCriteria, PaginationSupport.PAGESIZE, V^U1o[`
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startIndex); ?98]\pI
} Dxwv\+7]
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public PaginationSupport findPageByCriteria ,t]qe
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(final DetachedCriteria detachedCriteria, finalint *KXg;777
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pageSize, M:~/e8Xv
finalint startIndex){ ;5.o;|w?!
return(PaginationSupport) 6!3Jr
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getHibernateTemplate().execute(new HibernateCallback(){ o,sw[
publicObject doInHibernate T"GuE[?a
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(Session session)throws HibernateException { dWI.t1`i
Criteria criteria = $.z~bmH"D
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detachedCriteria.getExecutableCriteria(session); D-8>?`n\
int totalCount = BI\+NGrB
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((Integer) criteria.setProjection(Projections.rowCount '%m0@5|hCD
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()).uniqueResult()).intValue(); N+vU@)_lC
criteria.setProjection 0KF)+`CC>
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(null); ` tkd1M
List items = g1uqsqYt
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criteria.setFirstResult(startIndex).setMaxResults A!kNqJ2
}bv0~}G4
(pageSize).list(); 7\
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PaginationSupport ps = Z`?<A da
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new PaginationSupport(items, totalCount, pageSize, !vQ!_|g1
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startIndex); I>27U<PX
return ps; >q&Q4E0
} (Jw[}&+
}, true); !k&~|_$0@
} Te8BFcJG
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public List findAllByCriteria(final !j(KbAhWZ
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DetachedCriteria detachedCriteria){ c#G]3vTdE
return(List) getHibernateTemplate n(Up?_
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().execute(new HibernateCallback(){ tH:K6^oR
publicObject doInHibernate }eX_p6bBw
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(Session session)throws HibernateException { 4M8AYh2)
Criteria criteria = 16\U'<
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detachedCriteria.getExecutableCriteria(session); /s%I(iP4
return criteria.list(); \ooqa<_
} Gc9^Z=
}, true); ~^.&nph
} (%>Sln5hq
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public int getCountByCriteria(final `~(C\+gUp
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DetachedCriteria detachedCriteria){ s9A'{F
Integer count = (Integer) tji,by#E/%
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getHibernateTemplate().execute(new HibernateCallback(){ LIH>IpamN
publicObject doInHibernate J1<fE(X
)).;p_nLZ
(Session session)throws HibernateException { 1V`]sfRK
Criteria criteria = -aNTFt~|[
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detachedCriteria.getExecutableCriteria(session); x
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return bIm$7a`T
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criteria.setProjection(Projections.rowCount 7atYWz~yG
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()).uniqueResult(); uz4mHyS6
} E|9LUPcb
}, true); %:o@IRTRU
return count.intValue(); ;_i0@@J
} Jb-wvNJu
} x=B+FIJ
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用户在web层构造查询条件detachedCriteria,和可选的 8"LaP3U
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 %FFw!eVi
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PaginationSupport的实例ps。 ~+7yi4(i
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ps.getItems()得到已分页好的结果集 /&j4I