Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 %vjfAdC
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 rd4mAX6@
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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 gL6.,4q+1
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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 ]`_eaW?Ua
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分页支持类: HWi: CDgm
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java代码: (pkq{: Fs
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package com.javaeye.common.util; DjQgF=;
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import java.util.List; s!\Gi5b
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publicclass PaginationSupport { ^<QF*!
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publicfinalstaticint PAGESIZE = 30; 95hdQ<W
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privateint pageSize = PAGESIZE; : tcqb2p
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privateList items; A!fRpN
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privateint totalCount; >J_%'%%f
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privateint[] indexes = newint[0]; -<M'h
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privateint startIndex = 0; gaxxB]8
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public PaginationSupport(List items, int XI58Cy*!
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totalCount){ '"fZGz?
setPageSize(PAGESIZE); |!.VpN&
setTotalCount(totalCount); oiNt'HQ2/
setItems(items); [-'LJG Wb<
setStartIndex(0); f,QBj{M,
} L(w?.)E
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public PaginationSupport(List items, int V[baGNe
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totalCount, int startIndex){ O>kM2xw
setPageSize(PAGESIZE); 6`U]%qx_I
setTotalCount(totalCount); 4'BZ +A,p
setItems(items); qASV\
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setStartIndex(startIndex); f~Q]"I8w
} a7wc>@9Q,
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public PaginationSupport(List items, int 1]]#HTwX
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totalCount, int pageSize, int startIndex){ _&|<(m&."
setPageSize(pageSize); +W[NgUrGJ
setTotalCount(totalCount); *ci%c^}V
setItems(items); `as6IMqJD
setStartIndex(startIndex); ;P!x/Ct
} &24$*Oe
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publicList getItems(){ W:* {7qJ
return items; l"app]uVZ
} r0/o{Y|l6
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publicvoid setItems(List items){ h1jEulcMtq
this.items = items; 0>)F+QC
} RI#o9d"x}
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publicint getPageSize(){ +[Zcz4\9
return pageSize; XL!^tMk
} G*\U'w4w|*
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publicvoid setPageSize(int pageSize){ D~LU3#n
this.pageSize = pageSize; ~;P>}|6Y
} B96"|v$
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publicint getTotalCount(){ V.^Z)iNf^
return totalCount; [|{m/`8C
} 4VrL@c
@
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publicvoid setTotalCount(int totalCount){ hR(p{$-T
if(totalCount > 0){ Egr'IbB
this.totalCount = totalCount; g&`[r6B
int count = totalCount / bc(b1u?
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pageSize; lJ/{.uK
if(totalCount % pageSize > 0) {H[3[
count++; c?XqSK`',Z
indexes = newint[count]; 4oywP^I
for(int i = 0; i < count; i++){ -VP da @@w
indexes = pageSize * Jl|^
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i; Bn?MlG;aA
} /{HK0fd
}else{ 5x1_rjP$|
this.totalCount = 0; 4N{5i)
} A.@Af+
} l5fF.A7TT
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publicint[] getIndexes(){ \r7gubD
return indexes; |cd=7[B
} 8j<+ '
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publicvoid setIndexes(int[] indexes){ IWD21lS
this.indexes = indexes; +KKx\m*
} !-Br?
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publicint getStartIndex(){ ;_<K>r*
return startIndex; Z5%T pAu[
} -y5Zc?e
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publicvoid setStartIndex(int startIndex){ n^7m^1to
if(totalCount <= 0) $dgez#TPL
this.startIndex = 0; Isna
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elseif(startIndex >= totalCount) cA]Ch>]A%
this.startIndex = indexes $,L,VYN
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[indexes.length - 1]; E+|r
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elseif(startIndex < 0) PS${B
this.startIndex = 0; wM#BQe3t#
else{ ?B`Yq\L)
this.startIndex = indexes $bi@,&t;
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[startIndex / pageSize]; oHI/tS4
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} q\gvX
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} ?g~g GQV
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publicint getNextIndex(){ z`Cq,Sz/
int nextIndex = getStartIndex() + 6
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=-GHs$u%f
pageSize; en6oFPG
if(nextIndex >= totalCount) m&X6a C'[
return getStartIndex(); !j|93*
else |+0XO?,sZ
return nextIndex; j/9Uf|z-_
} ;
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publicint getPreviousIndex(){ fsDwfwil*
int previousIndex = getStartIndex() - 6W abw:
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pageSize; "x)xjL
if(previousIndex < 0) k)a-odNrb
return0; '!6Py1i
else p#Vh[UTl^
return previousIndex; ~yvOR`2Gg
} Q/,jv5
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} 2"~QI xY=
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抽象业务类 1*"t-+|
java代码: V~uH)IMkh7
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/** U Ux]
* Created on 2005-7-12 wf<=rW'
*/ KnC;j-j
package com.javaeye.common.business; `KgWaf-
}!i#1uHUH:
import java.io.Serializable; \V#2K><
import java.util.List; hZ0CnY8 '
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import org.hibernate.Criteria; =Kv*M@
import org.hibernate.HibernateException; W(oJ{R&m{
import org.hibernate.Session; cVt
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import org.hibernate.criterion.DetachedCriteria; \tj7Jy
import org.hibernate.criterion.Projections; hy"O_Le
import R7o3X,-iwn
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org.springframework.orm.hibernate3.HibernateCallback; 4E`y*Hmzy+
import MqBA?7
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org.springframework.orm.hibernate3.support.HibernateDaoS K 9ytot
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upport; ^T[8j/9o^
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import com.javaeye.common.util.PaginationSupport; R#ABda9
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public abstract class AbstractManager extends k !S0-/h
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HibernateDaoSupport { lLO|,
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privateboolean cacheQueries = false; sw.cw}1
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privateString queryCacheRegion; hjVct
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publicvoid setCacheQueries(boolean VQ5D?^'0/
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cacheQueries){ >hkmL](^
this.cacheQueries = cacheQueries; WgxGx`Y)
} (!72Eaw:]
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publicvoid setQueryCacheRegion(String 'OIOl
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queryCacheRegion){ tC0:w,C)
this.queryCacheRegion = u^DfRd&P0
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queryCacheRegion; {:U zW\5l)
} +gZg7]!Z
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publicvoid save(finalObject entity){ J1@X6U!{
getHibernateTemplate().save(entity); `SdvXn
} 3/rEXKS
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publicvoid persist(finalObject entity){ DQC=f8
getHibernateTemplate().save(entity); E8_j?X1
} P9Yee!*H
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publicvoid update(finalObject entity){ HeV6=
getHibernateTemplate().update(entity); ,$"*X-1
} !t.
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publicvoid delete(finalObject entity){ {+`'ZU6C
getHibernateTemplate().delete(entity); ,8~qnLy9
} ( v<l9}!
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publicObject load(finalClass entity, RO>3U2
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finalSerializable id){ ,8=`Y9#
return getHibernateTemplate().load 1k=w 9
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(entity, id); %2H0JXKa,
} xEW>7}+\
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publicObject get(finalClass entity, YkOl@l$D
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finalSerializable id){ Y^ Of
return getHibernateTemplate().get )4nf={iM
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(entity, id); U*P&O+(1'
} $&fP%p
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publicList findAll(finalClass entity){ F0.Rv):
return getHibernateTemplate().find("from c@eQSy
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" + entity.getName()); c(@(j8@S
} ,, 8hU7P
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publicList findByNamedQuery(finalString 1/JtL>SKE
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namedQuery){ %-lilo
return getHibernateTemplate UF_?T.Rl^
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().findByNamedQuery(namedQuery); A7`+XqG
} 'P AIh*qA
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publicList findByNamedQuery(finalString query, x=S8UKUx
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finalObject parameter){ jDO"?@+
return getHibernateTemplate D+nKQ4
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().findByNamedQuery(query, parameter); A$JL"~R
} zl]Ic' _i
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publicList findByNamedQuery(finalString query, s%bm1$}
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finalObject[] parameters){ [=EmDP:@
return getHibernateTemplate a<E\9DL
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().findByNamedQuery(query, parameters); x(]Um!
} =q\Ghqj1
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publicList find(finalString query){ tM:%{az
return getHibernateTemplate().find 6_=t~9sY
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(query); v1R t$[
} t}Q
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publicList find(finalString query, finalObject MnPk+eNJm
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parameter){ 7l+:gD
return getHibernateTemplate().find %a=^T?8
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(query, parameter); ,hVDGif
} [uLpm*7
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public PaginationSupport findPageByCriteria Zl\$9Q_
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(final DetachedCriteria detachedCriteria){ olxnQYFo
return findPageByCriteria 7Eo;TNbb
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); +HSKFp
} @Rw]boC
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public PaginationSupport findPageByCriteria TN=!;SvQU
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(final DetachedCriteria detachedCriteria, finalint DX(!G a
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startIndex){ oXgi#(y
return findPageByCriteria `gX$N1(
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(detachedCriteria, PaginationSupport.PAGESIZE, nr?| !gj
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startIndex); 3Hi[Y[O`%P
} v/GZByco>
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public PaginationSupport findPageByCriteria w!rw%
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(final DetachedCriteria detachedCriteria, finalint ?BnX<dbi&
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pageSize, mIW/x/I
finalint startIndex){ -+z8bZ
return(PaginationSupport) pn p)- a*7
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getHibernateTemplate().execute(new HibernateCallback(){ \qkb8H
publicObject doInHibernate q+U&lw|"w
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(Session session)throws HibernateException { sP@7%p>wt
Criteria criteria = D zdKBJT +
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detachedCriteria.getExecutableCriteria(session); vEc<|t
int totalCount = <AN5>:k[pM
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((Integer) criteria.setProjection(Projections.rowCount =h\uC).t&
Wg=q lux-
()).uniqueResult()).intValue(); oIGF=x,e8
criteria.setProjection 9dwLkr
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(null); [mFgo
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List items = ~BC~^D&WD
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criteria.setFirstResult(startIndex).setMaxResults 2Ft#S8
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(pageSize).list(); 9dFo_a*?
PaginationSupport ps = jJV1 /]TJ
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new PaginationSupport(items, totalCount, pageSize, &*; Z(ul&9
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startIndex); "h:#'y$V
return ps; h$#|s/
} NEt_UcC
}, true); scPvuHzl
} =kb/4eRg
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public List findAllByCriteria(final sMcN[r
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DetachedCriteria detachedCriteria){ ]\F}-I[
return(List) getHibernateTemplate W?gelu]
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().execute(new HibernateCallback(){ %FJB9?9=|
publicObject doInHibernate NdB:2P
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(Session session)throws HibernateException { Je~`{n
Criteria criteria = |N0RBa4%
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detachedCriteria.getExecutableCriteria(session); nTHCb>,vM
return criteria.list(); %UB+N8x`a
} OBf$0
}, true); yGC3B00Z
} r#w.yg4EX
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public int getCountByCriteria(final `.F3&pA
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DetachedCriteria detachedCriteria){ vP^V3
Integer count = (Integer) 5}:`CC2,S~
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getHibernateTemplate().execute(new HibernateCallback(){ tJpK/"R'
publicObject doInHibernate 1SG^X-(GM/
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(Session session)throws HibernateException { LzD,]{CC5
Criteria criteria = Na<);Pg
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detachedCriteria.getExecutableCriteria(session); RP%FMb}nt
return %18%T{|$e
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criteria.setProjection(Projections.rowCount 8b< 'jft
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()).uniqueResult(); Zn6u6<O=
} HJ;!'@
}, true); lMe+.P|
return count.intValue(); O |*-J
} @cn8 m
} Nq#B4Zx
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用户在web层构造查询条件detachedCriteria,和可选的 {11xjvAD
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 4}Yn!"jW&
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PaginationSupport的实例ps。 FMz>p1s|dK
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ps.getItems()得到已分页好的结果集 a6 w'.]m
ps.getIndexes()得到分页索引的数组 d bHxc@H
ps.getTotalCount()得到总结果数 7-d.eNQl
ps.getStartIndex()当前分页索引 9)D9'/{L#
ps.getNextIndex()下一页索引 UHX,s
ps.getPreviousIndex()上一页索引 "]U_o<V
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 BB.120v&N
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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 `Af5%m[
*z)+'D*+
一下代码重构了。 co{i~['u
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我把原本我的做法也提供出来供大家讨论吧: `+@r0:G&v
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首先,为了实现分页查询,我封装了一个Page类: TbgIr
java代码: u^( s0q
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/*Created on 2005-4-14*/ IgPU^?sp
package org.flyware.util.page; Vsd4;
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/** p%IVWeZnx
* @author Joa zA8Tp8(
* `_(N(dm
*/ ESni r6HoU
publicclass Page { ;I~UQgE6H
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/** imply if the page has previous page */ !r4B1fX
privateboolean hasPrePage; fK+[r1^
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/** imply if the page has next page */ BKQwF*<V
privateboolean hasNextPage; m.c2y6<=
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/** the number of every page */ 7x.]
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privateint everyPage; D:PrFa
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/** the total page number */ g&X
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privateint totalPage; Su*Pd;
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/** the number of current page */ s"(F({J
privateint currentPage; Z._%T$8aJv
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/** the begin index of the records by the current OhTd>~R`<
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query */ -P28pVX`
privateint beginIndex; RU\MT'E>(
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/** The default constructor */ '[Bok=$B)
public Page(){ J1Oe`my
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} XRXQ
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/** construct the page by everyPage F\-oZ#g
* @param everyPage LNF|mS\+D
* */ wa$Q8/
public Page(int everyPage){ 3($tD*!o
this.everyPage = everyPage; ,b74m
} )u.%ycfeV
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/** The whole constructor */ {r_x\VC=p
public Page(boolean hasPrePage, boolean hasNextPage, dQ_yb+<
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int everyPage, int totalPage, Nj+gSa9
int currentPage, int beginIndex){ SlD7 \X&~
this.hasPrePage = hasPrePage; 2(25IYMS8
this.hasNextPage = hasNextPage; ~-#8j3 J;
this.everyPage = everyPage; iV.j!H7o
this.totalPage = totalPage; J@o$V- KK
this.currentPage = currentPage; 1.z]/cx<y
this.beginIndex = beginIndex; NH!x6p]n
} @c;:D`\p1C
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/** %D E_kwL
* @return h8:5[;e
* Returns the beginIndex. jGtu>|Gj
*/ &'W ~~ir
publicint getBeginIndex(){ \' >d.'d
return beginIndex; U]
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} #>O+!IH
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/** FXFyF*w2
* @param beginIndex #NQx(C
* The beginIndex to set. Gr!@ih^
*/ H1hADn
publicvoid setBeginIndex(int beginIndex){ ;#ElJXS
this.beginIndex = beginIndex; <4jqF 4
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} )q>q]eHz
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/** ]ujXPK=t
* @return epxbTJfc
* Returns the currentPage. QI6=[
*/ \OK"r-IO
publicint getCurrentPage(){ $Sc;
return currentPage; Fqg*H1I[
} e6_`
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/** O*m9qF<
* @param currentPage I$JyAj
* The currentPage to set. @~`:sa+H
*/ Gw?ueui<
publicvoid setCurrentPage(int currentPage){ !X+}W[Ic^
this.currentPage = currentPage; Z2&7HTz
} _t@9WA;+\
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/** gCv[AIE_m
* @return 7x)32f"
* Returns the everyPage. bipA{VU
*/ t9[%o=N~lD
publicint getEveryPage(){ !c=EB`<*
return everyPage; #s|,oIm
} CzG/=#IU
=[IKwmCX
/** la89>pF
* @param everyPage 9 N9Q#o$!.
* The everyPage to set. XseP[
*/ gutf[Ksu
publicvoid setEveryPage(int everyPage){ Pt?d+aBtV
this.everyPage = everyPage; ZG1 {"J/z
}
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/** 0{sYD*gK]
* @return mZ4I}_\,
* Returns the hasNextPage. fx= %e
*/
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publicboolean getHasNextPage(){ xQ\S!py-
return hasNextPage; E9:p A5H-j
} 7` IO mTk
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/** HOlMj!.
* @param hasNextPage 2hE+Om^n
* The hasNextPage to set. P*9L3R*=N
*/ f%c-
publicvoid setHasNextPage(boolean hasNextPage){ Nj`Miv o
this.hasNextPage = hasNextPage; +V/m V7FK
} 6Y/TqI[
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/** 9H,Ec,.
* @return BH^8!7dkT
* Returns the hasPrePage. eLyaTOZadu
*/ z|sR
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publicboolean getHasPrePage(){ $d%NFc&
return hasPrePage; i`" L?3T
} 7G9o%!D5
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/** mY/x|)MmM
* @param hasPrePage p$bR M`R&s
* The hasPrePage to set. 2 [yfo8H
*/ L6"?p-:@'
publicvoid setHasPrePage(boolean hasPrePage){ =-8y=
this.hasPrePage = hasPrePage; ,)P6fa/
} >;OwBzB
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/** $_b^p=
* @return Returns the totalPage. L*Q#!_K0P
* #;9n_)
*/ Kw%n;GFl'
publicint getTotalPage(){ Ax=k0%M[&
return totalPage; ^cE|o&Rm;
} !$:lv)y
Z;^UY\&X
/** 6wzTX8
* @param totalPage CvwC| AW
* The totalPage to set. (f^K\7HM
*/ ~*|0yPFg
publicvoid setTotalPage(int totalPage){ pZu2[
this.totalPage = totalPage; \\F@_nB,b
} g4 BEo'
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} MCOz-8@|Y
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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 \}0J%F1
wG1A]OJl1
个PageUtil,负责对Page对象进行构造: VO|2
java代码: "y_A xOH
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/*Created on 2005-4-14*/ RO-ABFEi(
package org.flyware.util.page; P
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import org.apache.commons.logging.Log; O]OZt,k(
import org.apache.commons.logging.LogFactory; <lHelX=/
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/** .".xNHR#
* @author Joa V+/Vk1
* ?UAB}CjY
*/ 2QUZAV\ Y
publicclass PageUtil { -G<$wh9~3
;~Eb Q
privatestaticfinal Log logger = LogFactory.getLog t'@1FA!)
P
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(PageUtil.class); :IFTiq5a;
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/** xU/Eu;m
* Use the origin page to create a new page Py$*c
* @param page 2| u 'J
* @param totalRecords Z~}=q
* @return [gZd$9a
*/ sy+o{] N
publicstatic Page createPage(Page page, int jHPJk8@y
:]%z8,6k
totalRecords){ &:g5+([<