Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 [d!C6FT
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 |0w'+HaE~N
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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 EU, 4qO
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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 >
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分页支持类: 8 Oeg"d
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java代码: u0$7k9mE
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package com.javaeye.common.util; tH:ea$A
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import java.util.List; ,@!8jar@w}
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publicclass PaginationSupport { ]T^m>v)X
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publicfinalstaticint PAGESIZE = 30; #2DH_P
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privateint pageSize = PAGESIZE; /db?ltb
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privateList items; sNvT0
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privateint totalCount; E yNI]XEj
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privateint[] indexes = newint[0]; g8XGZW!
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privateint startIndex = 0; ~J<bwF
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public PaginationSupport(List items, int =La}^
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totalCount){ F:pXdU-xf
setPageSize(PAGESIZE);
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setTotalCount(totalCount); #j-,#P@
setItems(items); (dMFYL>YP
setStartIndex(0); A</[Q>8
} A ws#>l<
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public PaginationSupport(List items, int C2<y(GU[Bh
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totalCount, int startIndex){ Od&M^;BQ
setPageSize(PAGESIZE); sTG+c E
setTotalCount(totalCount); =~=/ d q
setItems(items); dt`L}Yi
setStartIndex(startIndex); Km,tfM5j
} X3W)c&Pr
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public PaginationSupport(List items, int e982IP
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totalCount, int pageSize, int startIndex){ !FSraW2
setPageSize(pageSize); #eUfwd6.Y
setTotalCount(totalCount); K6Gc)jp:b
setItems(items); b,Z&P|
setStartIndex(startIndex); k2t?e:)3zr
} d:pp,N~2o
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publicList getItems(){ >`{i[60r
return items; L//sJe
} B8_l+dXO
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publicvoid setItems(List items){ `|/|ej]$P
this.items = items; !r
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} [CUJ A
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publicint getPageSize(){ cEqh|Q
return pageSize; %eV`};9
} i;xg[e8.
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publicvoid setPageSize(int pageSize){ ##s!-.T
this.pageSize = pageSize; $U8ap4EXM
} q~w;C([k_
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publicint getTotalCount(){ eXOFA d]>u
return totalCount; (Dl"s`UH~
} IL\mFjZ'
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publicvoid setTotalCount(int totalCount){ yBe/UFp+
if(totalCount > 0){ c|.:J]
this.totalCount = totalCount; (mD]}{>
int count = totalCount / ib&qH_r/
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pageSize; 7 %|>7
if(totalCount % pageSize > 0) F0JFx$AoD
count++; z<fEJN
indexes = newint[count]; os.x|R]_
for(int i = 0; i < count; i++){ kp6x6%{K\
indexes = pageSize * dXDD/8E
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i; Ck:J
} Jzdc'3dq
}else{ >'jM8=o*Ax
this.totalCount = 0; ]Bsq?e^
} "EHc&,B`
} b910Z?B^L
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publicint[] getIndexes(){ wtUG2 (
return indexes; etoE$2c
} sy?>e*-{
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publicvoid setIndexes(int[] indexes){ xY S%dLE"
this.indexes = indexes; Hj\~sR$L-
} kYs|")isj
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publicint getStartIndex(){ X]fw9tZ
return startIndex; 3DHm9n+/:
} oW[,EW+u
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publicvoid setStartIndex(int startIndex){ K_5&_P1
if(totalCount <= 0) Tpukz_F
this.startIndex = 0; injmP9ed
elseif(startIndex >= totalCount) )^\='(s
this.startIndex = indexes v'!Ntk
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[indexes.length - 1]; C6VoOT)\
elseif(startIndex < 0) g5Dx9d{
this.startIndex = 0; $<cZ<g5)
else{ %D
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this.startIndex = indexes dM UDLr-
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[startIndex / pageSize]; h)rf6*hw
} AD\<}/3U
} m GhJn
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publicint getNextIndex(){ {^W,e ^:
int nextIndex = getStartIndex() + Gme$FWa
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pageSize; b8.%? _?
if(nextIndex >= totalCount) j7 =3\SO
return getStartIndex(); Qu,k
else X u):.0I
return nextIndex; Pm^N0L9?q
} tb0E?&M
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publicint getPreviousIndex(){ (nD$%/uK'
int previousIndex = getStartIndex() - 5j,qAay9
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pageSize; `4H9f&8(
if(previousIndex < 0) 6I.m c
return0; r0deBRM
else 'd^gRH<z
return previousIndex; r.b6E% D
} ph?0I:eU
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} R.H\b!
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抽象业务类 AC:s4iacC
java代码: SP*JleQN
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/** %s2"W~
* Created on 2005-7-12 1m`tqlFU9
*/ bo;pj$eR3R
package com.javaeye.common.business; 2c~?UK[1
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import java.io.Serializable; IR
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import java.util.List; O)xEF~DaD
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import org.hibernate.Criteria; L%K_.!d^
import org.hibernate.HibernateException; Bdq"6SK>
import org.hibernate.Session;
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import org.hibernate.criterion.DetachedCriteria; '<D `:srV
import org.hibernate.criterion.Projections; te*Y]-&I|/
import e#6&uFce
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org.springframework.orm.hibernate3.HibernateCallback; \+Rwm:lI
import ]X:
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org.springframework.orm.hibernate3.support.HibernateDaoS 5d?!<(e6
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upport; 22/?JWL>
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import com.javaeye.common.util.PaginationSupport; Iq0 #A5U%
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public abstract class AbstractManager extends *%N7QyO`I
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HibernateDaoSupport { ?]\W8)
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privateboolean cacheQueries = false; "_1-IE
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privateString queryCacheRegion; B)*#g
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publicvoid setCacheQueries(boolean Ie2w0Cs28
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cacheQueries){ M8?#%x6;N
this.cacheQueries = cacheQueries; Y-%l7GErhL
} V8nz-DL{
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publicvoid setQueryCacheRegion(String Pv7f
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queryCacheRegion){ [/AdeR
this.queryCacheRegion = %;<k(5bhGJ
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queryCacheRegion; i9&K
} h{W$ fZc<
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publicvoid save(finalObject entity){ ez^*M:K
getHibernateTemplate().save(entity); I3 G*+6V
} uG=t?C6
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publicvoid persist(finalObject entity){ 5U-p'c9IC
getHibernateTemplate().save(entity); ;z.6'EYMG
} mh
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publicvoid update(finalObject entity){ nc3ltT,R
getHibernateTemplate().update(entity); tDC0-N&6S~
} |&elZ}8
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publicvoid delete(finalObject entity){ er["NSo
getHibernateTemplate().delete(entity); 'w` SBYQ5
} DA+A >5/
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publicObject load(finalClass entity, P9
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finalSerializable id){ saGRP}7?
return getHibernateTemplate().load C<[d
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(entity, id); 22)0zY%\
} &Pu+(~'Q
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publicObject get(finalClass entity, 6WA|'|}=
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finalSerializable id){ 0hrCG3k.91
return getHibernateTemplate().get aL8p"iSG9
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(entity, id); )ZT6:)
} GXT]K>LA
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publicList findAll(finalClass entity){ FjD,8^SQW
return getHibernateTemplate().find("from \@Ee9C13
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" + entity.getName()); B3y?.
} G;2R]H#p
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publicList findByNamedQuery(finalString ;M}itM
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namedQuery){ _REqT
return getHibernateTemplate *-?Wcz
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().findByNamedQuery(namedQuery); O4m(Er@a
} cwk+#ur
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publicList findByNamedQuery(finalString query, q}#iV$dAj
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finalObject parameter){ M0RRmW@f.a
return getHibernateTemplate 6XdWm
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().findByNamedQuery(query, parameter); FXS^^p
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} $[[?;g
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publicList findByNamedQuery(finalString query, 8jRs=I
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finalObject[] parameters){ z(+&wa
return getHibernateTemplate },rav]
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().findByNamedQuery(query, parameters); w "{bp
} y>$1UwQ
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publicList find(finalString query){ J5;5-:N
return getHibernateTemplate().find a>U6Ag<
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(query); Nu@5 kwH
} y`4{!CEyLW
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publicList find(finalString query, finalObject ~F;CE"3A
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parameter){ {&-#s#&
return getHibernateTemplate().find @}(SR\~N]
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(query, parameter); (VyA6a8
} |=O1Hn
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public PaginationSupport findPageByCriteria dByjcTPA
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(final DetachedCriteria detachedCriteria){ fp{G|.SA
return findPageByCriteria B52yaG8C
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); jJia.#.Ze
} C`NmZwL
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public PaginationSupport findPageByCriteria Nt~x&s
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(final DetachedCriteria detachedCriteria, finalint p>q&&;fe
9/@ &*
startIndex){ %G[/H.7s-
return findPageByCriteria T`\]!>eb
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(detachedCriteria, PaginationSupport.PAGESIZE, zJY']8ah
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startIndex); \lEkfcc
} j0x5@1`6G
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public PaginationSupport findPageByCriteria k][h9'
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(final DetachedCriteria detachedCriteria, finalint 59<hV?
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pageSize, [jrqzB
finalint startIndex){ 'Jydu
return(PaginationSupport) Xwq]f:@V
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getHibernateTemplate().execute(new HibernateCallback(){ VI_+v[Hk/
publicObject doInHibernate g1{/ 5{XI
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(Session session)throws HibernateException { [b/o$zR
Criteria criteria = aGK@)&h$
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detachedCriteria.getExecutableCriteria(session); AnMV <
int totalCount = TSjIz5
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((Integer) criteria.setProjection(Projections.rowCount B!;+_%P76
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()).uniqueResult()).intValue(); UpfZi9v?W
criteria.setProjection bL`eiol6
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(null); >c~RI7uu
List items = }mk>!B}=
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criteria.setFirstResult(startIndex).setMaxResults cWa)#:JOV
"=A>}q@;H
(pageSize).list(); #xT!E:W'
PaginationSupport ps = aG{$Ic
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new PaginationSupport(items, totalCount, pageSize, !SxG(*u
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startIndex); O{]9hm(tN
return ps; qP1FJ89H
} L/Vx~r`P
}, true); ,
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} i9 A ~<
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public List findAllByCriteria(final gl7|H&&xV
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DetachedCriteria detachedCriteria){ p|[B
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return(List) getHibernateTemplate Q5a)}6-5
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().execute(new HibernateCallback(){ {whvTN1#dh
publicObject doInHibernate ~*.-
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(Session session)throws HibernateException { 09h.1/
Criteria criteria = V diJ>d[
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detachedCriteria.getExecutableCriteria(session); @xAfZb2 E
return criteria.list(); S\#1 7.=
} HM9fjl[
}, true); YY5!_k
} hdma=KqZ(
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public int getCountByCriteria(final }q[Bd
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DetachedCriteria detachedCriteria){ =E*Gb[r_7
Integer count = (Integer) q_[G1&MC
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getHibernateTemplate().execute(new HibernateCallback(){ >3.X?
publicObject doInHibernate t18$x"\4k
gm"#:< )
(Session session)throws HibernateException { r'7LR
Criteria criteria = 9jir*UI
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detachedCriteria.getExecutableCriteria(session); , X{>
return 2f~($}+*
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criteria.setProjection(Projections.rowCount Zyf P;&
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()).uniqueResult(); e^1uVN
} #I*QX%(H#
}, true); \;X+X,M
return count.intValue(); uBrMk
} Cfu=u *u
} muON>^MbC
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用户在web层构造查询条件detachedCriteria,和可选的 J Yb}Zw;
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 kS5_
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PaginationSupport的实例ps。 -e GL) M
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ps.getItems()得到已分页好的结果集 26?W
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ps.getIndexes()得到分页索引的数组 K>:]Bx#F7
ps.getTotalCount()得到总结果数 Io`P,l:
ps.getStartIndex()当前分页索引 NE2pL@sk
ps.getNextIndex()下一页索引 9p* gU[
ps.getPreviousIndex()上一页索引 am1[9g8L
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ]va>ex$d
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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
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一下代码重构了。 3chPY4~A
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我把原本我的做法也提供出来供大家讨论吧: Wm~` ~P
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首先,为了实现分页查询,我封装了一个Page类: ZIR0PQh\
java代码: w>fdQ!RdP
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/*Created on 2005-4-14*/ ]Y>h3T~
package org.flyware.util.page; o{b=9-V
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/** W1Lr_z6
* @author Joa -$VZtex
* 8b.u'r174
*/ 54;J8XT7
publicclass Page { Jb)#fH$L
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/** imply if the page has previous page */ GPhl4#'
privateboolean hasPrePage; &;,,H< p
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/** imply if the page has next page */ p9U?!L!y
privateboolean hasNextPage; u?Tpi[
#
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/** the number of every page */ HmfG$Z
privateint everyPage; FsB^CxVg
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/** the total page number */ s5.AW8X=?*
privateint totalPage; t>GfM
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/** the number of current page */ 'bGX-C
privateint currentPage; \;-fi.Hrf$
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/** the begin index of the records by the current 4nH*Ui!T
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query */ RCTQhTy=
privateint beginIndex; s]T""-He
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@D-AO_
/** The default constructor */ &1l=X]%
public Page(){ >&g}7d%
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} ANIz,LS
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/** construct the page by everyPage /(.6bv
* @param everyPage lf>*Y.!@me
* */ O%1v)AT&\
public Page(int everyPage){ 9jN)I(^D6
this.everyPage = everyPage; wxm:7$4C
} J$4wL
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/** The whole constructor */ O3N0YGhJ
public Page(boolean hasPrePage, boolean hasNextPage, p~ C.IG
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int everyPage, int totalPage, sS&Z ,A
int currentPage, int beginIndex){ `28};B>
this.hasPrePage = hasPrePage; <APB11
this.hasNextPage = hasNextPage; hS[yNwD
this.everyPage = everyPage; ELh8ltLY
this.totalPage = totalPage; 7NC=*A~
this.currentPage = currentPage; `X,yM-(
this.beginIndex = beginIndex; r1ws1 rr=
} ^8 ' sib
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/** L=2y57&Y
* @return r ]W
* Returns the beginIndex. ^:9$@+a
*/ iX'rU@C
publicint getBeginIndex(){ s5RjIa0$7
return beginIndex; 5TBp'7 /s~
} *lef=:&,,
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/** 7W6cM%_B
* @param beginIndex Q]rD}Ckv-
* The beginIndex to set. K1V#cB
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*/ [1 Ydo`
publicvoid setBeginIndex(int beginIndex){ [D5t{[i
this.beginIndex = beginIndex; tbnH,*
} LqdY Qd51
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/** bYz&P`o}
* @return Qu,8t8
* Returns the currentPage. Ro2d,'
*/ '0$?h9"
publicint getCurrentPage(){ 3] 1-M
return currentPage; pZ#ap<|>I
} >NB?&|
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/** B\g]({E
* @param currentPage do uc('@
* The currentPage to set. #YDr%>j
*/ dD<fn9t
publicvoid setCurrentPage(int currentPage){ h7s;m
this.currentPage = currentPage; e!fqXVEVR
} DF6c|
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/** 6Es?
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* @return _LwOOZj
* Returns the everyPage. <o2r~E0r3
*/ kt4d;4n
publicint getEveryPage(){ jlFk@:y4
return everyPage; 10#oG{9
} #d{=\$=
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/** %!ebO*8q
* @param everyPage E,n}HiAz7V
* The everyPage to set. :b[`
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*/ \:>
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publicvoid setEveryPage(int everyPage){ 7FN<iI&7\
this.everyPage = everyPage; #k3t3az2{
} c:83LZ
k`".
/** c`x7u}C
* @return q P ;A}C
* Returns the hasNextPage. @DW[Z`X
*/
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publicboolean getHasNextPage(){ yGg,$WM
return hasNextPage; >r &;3:"
} 3Rm#-T s
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/** -st7_3
* @param hasNextPage Gamr6I"K
* The hasNextPage to set. 0'&X
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*/ .I3?7
publicvoid setHasNextPage(boolean hasNextPage){ Oo?,fw
this.hasNextPage = hasNextPage; = sAn,ri
} elG;jB
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/** hP J4Oj1O
* @return <lr*ZSNY
* Returns the hasPrePage. ozsxXBh-`'
*/ {F&-7u0
publicboolean getHasPrePage(){ HxK$ 4I`
return hasPrePage; +Taa!hfys
} TI y&&_p
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/** G0n'KB
* @param hasPrePage VcK}2<8:+~
* The hasPrePage to set. 3CTX -#)vS
*/ NGYyn`Lx
publicvoid setHasPrePage(boolean hasPrePage){ D j\e@?Y
this.hasPrePage = hasPrePage; H* !EP
} v;{{ y-
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/** wLuv6\E
* @return Returns the totalPage. ]L2Oz
* fpM#XFj
*/ ~Lfcg*
publicint getTotalPage(){ a)*6gf<