Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ,qBnqi[
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 0ECO/EuCg
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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 XL"v21X
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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 sWojQ-8}
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分页支持类: Ba\wq:
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java代码: C+Fh$
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package com.javaeye.common.util; a[d{>Fb.
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import java.util.List; q;Ar&VrlNq
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publicclass PaginationSupport { yNb#Ia
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publicfinalstaticint PAGESIZE = 30; {Q#Fen
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privateint pageSize = PAGESIZE; 32)&;
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privateList items; ((hJmaq
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privateint totalCount; Fw_bY/WN{
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privateint[] indexes = newint[0]; 4cVs(`g^
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privateint startIndex = 0; s[{:>~{iq
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public PaginationSupport(List items, int Z<,CzKs+||
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totalCount){ z9);e8ck
setPageSize(PAGESIZE); 8h@)9Q]d\
setTotalCount(totalCount); l/y
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setItems(items); |GVGny<
setStartIndex(0); &EbD.>Ci
} 21)-:rS
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public PaginationSupport(List items, int .SKNIct
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totalCount, int startIndex){ R;Gl{
setPageSize(PAGESIZE); `|ck5DZT5L
setTotalCount(totalCount); 6S+K*/w
setItems(items); oE|u;o
setStartIndex(startIndex); X'3`Q S:!
} J*6n6
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public PaginationSupport(List items, int R>YMGUH~w
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totalCount, int pageSize, int startIndex){ JK^B +.
setPageSize(pageSize); EU&3Pdnd
setTotalCount(totalCount); ,nu7r1}
setItems(items); /Mi-lh^j-
setStartIndex(startIndex); 9B?t3:
} sgb+@&}9n
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publicList getItems(){ ;5JIY7t
return items; v[3hnLN%
} Fh!!T%5>C
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publicvoid setItems(List items){ 0u&?Zy9&
this.items = items; 6UzT]" LR;
} j
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publicint getPageSize(){ @qr3v>3X<
return pageSize; E't G5,/m
} _.J[w6
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publicvoid setPageSize(int pageSize){ p?`|CE@h7
this.pageSize = pageSize; ?/|@ #&
} Zy+QA>d|
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publicint getTotalCount(){ ,h(f\h(9
return totalCount; JXy667_
} #3:'lGBIK
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publicvoid setTotalCount(int totalCount){ s2' :&5(
if(totalCount > 0){ 4f @\f7\
this.totalCount = totalCount; L8-[:1
int count = totalCount / O^="T^J
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pageSize; {;(g[H=q;
if(totalCount % pageSize > 0) m 'H
count++; z1@sEfk>
indexes = newint[count]; \qd)l
for(int i = 0; i < count; i++){ pi l*/&pB
indexes = pageSize * h
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} jv#" vQ9A]
}else{ Fi3(glgd-
this.totalCount = 0; ht74h
} VL!kX``^F
}
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publicint[] getIndexes(){ *,XJN_DKj
return indexes; s:Ql](/B#
} M(]|}%
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publicvoid setIndexes(int[] indexes){ u1|Y;*
this.indexes = indexes; 2T2#HP
} ^{sI'l~
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publicint getStartIndex(){ O/r<VTOp
return startIndex; A)p!w aG
} Y;5^w=V
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publicvoid setStartIndex(int startIndex){ +?m=f}>W1
if(totalCount <= 0) w!h{P38
this.startIndex = 0; Lzx(!<v
elseif(startIndex >= totalCount) `kT$Gx4x
this.startIndex = indexes 9 0(oV&
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[indexes.length - 1]; w.F3o4YP
elseif(startIndex < 0) xfV2/A#h
this.startIndex = 0; Yw1q2jT
else{ Bma|!p{
this.startIndex = indexes &i}cC4i
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[startIndex / pageSize]; l aL4ez
} :Y?08/V
} 1bAp{u&
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publicint getNextIndex(){ j9fL0$+FI
int nextIndex = getStartIndex() + {]m
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pageSize; =ir;m
if(nextIndex >= totalCount) E2/U']R
return getStartIndex(); s#Y7*?Sm
else KUn5S&eB
return nextIndex; "dU#j,B2
} 8o5^H>
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publicint getPreviousIndex(){ l|QFNW[i
int previousIndex = getStartIndex() - 3Eux-C!t
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pageSize; R =c
if(previousIndex < 0) #^[N4uV
return0; 6h*bcb#C
else /OtQk-E
return previousIndex; iQR})=Q
} ?#y<^oNM
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抽象业务类 /PuWJPy;
java代码: L ]'CA^N
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/** 39m"}26*E
* Created on 2005-7-12 ]OUOL/J
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package com.javaeye.common.business; Y]Nab0R&
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import java.io.Serializable; XD>@EYN<X
import java.util.List; 1pr_d"#4
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import org.hibernate.Criteria; qq{N; C
import org.hibernate.HibernateException; qk"=nAJX
import org.hibernate.Session; &otgN<H9
import org.hibernate.criterion.DetachedCriteria; i 58CA?
import org.hibernate.criterion.Projections; Yx/~8K_%M?
import }u)GERWO
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org.springframework.orm.hibernate3.HibernateCallback; ;lt;]7
import b,A1(_pzi
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org.springframework.orm.hibernate3.support.HibernateDaoS srA~gzF
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upport; fYPU'"hzG
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import com.javaeye.common.util.PaginationSupport; vw
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public abstract class AbstractManager extends by[(9+/z$
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HibernateDaoSupport { wd0ACF
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privateboolean cacheQueries = false; "Y0[rSz,UW
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privateString queryCacheRegion; Jxp'.oo[
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publicvoid setCacheQueries(boolean e28#Yh@U
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cacheQueries){ {q4"x5|
this.cacheQueries = cacheQueries; fX|,s2-FW
} l.)!jWY
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publicvoid setQueryCacheRegion(String A1;t60z+q>
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queryCacheRegion){ =Z$6+^L
this.queryCacheRegion = /LzNr0>2
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queryCacheRegion; I@+<[n2
} S5!2%-;<k
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publicvoid save(finalObject entity){ gf>5xf{M
getHibernateTemplate().save(entity); @jeV[N,0
} o(qmI/h
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publicvoid persist(finalObject entity){ sl 5wX
getHibernateTemplate().save(entity); !7D S
} nQ6'yd"
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publicvoid update(finalObject entity){ 4v
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getHibernateTemplate().update(entity); 5gEK$7Vp
} n-_w0Y
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publicvoid delete(finalObject entity){ pn|{P<b\
getHibernateTemplate().delete(entity); "de:plMofy
} (*]Y<ve
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publicObject load(finalClass entity, mqw.v$>
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finalSerializable id){ ha5\T'
return getHibernateTemplate().load 5.
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(entity, id); {BU,kjv1g
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publicObject get(finalClass entity, EK^2 2vi$
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finalSerializable id){ &aOOG8l
return getHibernateTemplate().get Y$^QH.h
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(entity, id); +`FY
} z_TK
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publicList findAll(finalClass entity){ 8%Lg)hvl
return getHibernateTemplate().find("from N~(}?'y9S
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" + entity.getName()); fM{Vy])J
} ?K"]XXsI
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publicList findByNamedQuery(finalString R,lr&;a8
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namedQuery){ %94"e7Hy
return getHibernateTemplate #oI`j
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().findByNamedQuery(namedQuery); fkM4u<R^
} 9q?gmAn.
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publicList findByNamedQuery(finalString query, b3H;Ea?^^<
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finalObject parameter){ z,WrLZC
return getHibernateTemplate )U`
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().findByNamedQuery(query, parameter); -}s?!Pg>
} P^UcpU,
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publicList findByNamedQuery(finalString query, 6822xk
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finalObject[] parameters){ e_SlM=_u
return getHibernateTemplate _+i-)
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().findByNamedQuery(query, parameters); jBM>Pe^`3
} $8)/4P?OL
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publicList find(finalString query){ }V{,
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return getHibernateTemplate().find iVRz
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(query); 9 +6"<r!
} H;8(y4;
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publicList find(finalString query, finalObject 4p]Y`];U
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parameter){ 5"+* c@L
return getHibernateTemplate().find a%kj)ah
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(query, parameter); G>b1No3%k
} 8}&cE#@
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public PaginationSupport findPageByCriteria `#hy'S:e
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(final DetachedCriteria detachedCriteria){ B(~D*H2T[
return findPageByCriteria 9I9)5`d|Jn
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); :}lE@Y,R
} q:(K^
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public PaginationSupport findPageByCriteria v'uQ'CiH
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(final DetachedCriteria detachedCriteria, finalint 8^T' a^Wt
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startIndex){ 2-]m#}zbP
return findPageByCriteria {)+/w"^.
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(detachedCriteria, PaginationSupport.PAGESIZE, -v:Y\=[\
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startIndex); qQb8K+ t
} ,F1$Of/'@\
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public PaginationSupport findPageByCriteria wFe</U-';
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(final DetachedCriteria detachedCriteria, finalint N4Ym[l
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pageSize, Rj8l]m6U9
finalint startIndex){ uzS57 O%
return(PaginationSupport) *m;L.r`5[
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getHibernateTemplate().execute(new HibernateCallback(){ wZ\0<skU
publicObject doInHibernate 0Bll6Rd
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(Session session)throws HibernateException {
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Criteria criteria = GxBj N7"
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detachedCriteria.getExecutableCriteria(session); ,Vogo5~X
int totalCount = (wTg aV1
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((Integer) criteria.setProjection(Projections.rowCount 4B|f}7%\
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()).uniqueResult()).intValue(); h0GXN\xI
criteria.setProjection hAY_dM
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(null); ow&R~_
List items = vt1!|2{
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criteria.setFirstResult(startIndex).setMaxResults $wBUu
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(pageSize).list(); ?HW*qD#k
PaginationSupport ps = @+xQj.jNC
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new PaginationSupport(items, totalCount, pageSize, {5,CW
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startIndex); 6K,AQ.=V2
return ps; )t|M)z J
} ].$N@tC
}, true); MQI6e".
} //`X+[bMG
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public List findAllByCriteria(final (LnKaf8
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DetachedCriteria detachedCriteria){ $ (GXlhA
return(List) getHibernateTemplate 1(-)$m8}
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().execute(new HibernateCallback(){ i6[Hu8
publicObject doInHibernate Ts.61Rx
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(Session session)throws HibernateException { XX+4X*(o
Criteria criteria = ^mH^cP?/
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detachedCriteria.getExecutableCriteria(session); V%"aU}
return criteria.list(); }^=J]
} (*#S%4(YX
}, true); #
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} ?@tp1?)
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public int getCountByCriteria(final QqRL>.)W
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DetachedCriteria detachedCriteria){ VLR W,lR9O
Integer count = (Integer) Wu:evaZ:i
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getHibernateTemplate().execute(new HibernateCallback(){ {`{U\w5Af
publicObject doInHibernate R+P1 +5
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(Session session)throws HibernateException { t1D6#JP(a
Criteria criteria = @xmL?wz
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detachedCriteria.getExecutableCriteria(session); BYRf MtT@+
return SI-s:%O
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criteria.setProjection(Projections.rowCount -2f_e3jF
Lb(=:Z!{
()).uniqueResult(); ) !3sB{H
} F6yMk%
}, true); oB+drDp8U
return count.intValue(); x2l~aw#?
} e~xN[Q\0]
} *M09Y'5]
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用户在web层构造查询条件detachedCriteria,和可选的 WSUU_^.
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 uq'T:d
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PaginationSupport的实例ps。 :W^
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ps.getItems()得到已分页好的结果集 rQCj^=cf;~
ps.getIndexes()得到分页索引的数组 Ean
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ps.getTotalCount()得到总结果数 ht)J#Di
ps.getStartIndex()当前分页索引 [8[g_
ps.getNextIndex()下一页索引 Re-4y5f
ps.getPreviousIndex()上一页索引 "H#2
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 PCtf&U