Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ?gq',FFDq
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 FqvMi:F
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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 +[=yLE#P%
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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 Tb2Tb2C
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。 x[ sSM:
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分页支持类: =:|fN3nJ2
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java代码: __FhuP P
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package com.javaeye.common.util; C< :F<[H
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import java.util.List; k:+Bex$g
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publicclass PaginationSupport { uv:DO6 {
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publicfinalstaticint PAGESIZE = 30; $'9b,- e
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privateint pageSize = PAGESIZE; _l i\b-
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privateList items; i$Rlb5RU
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privateint totalCount; ;w^-3 U7:
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privateint[] indexes = newint[0]; q}nL'KQ,n
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privateint startIndex = 0; k 5<[N2D|!
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public PaginationSupport(List items, int :%#(<@ {
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totalCount){ CoZXbTq
setPageSize(PAGESIZE); <2\4eusk
setTotalCount(totalCount); LPg1 G+e
setItems(items); jslfq@5v
setStartIndex(0); -n C
5
} OT&mNE4
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public PaginationSupport(List items, int E!a5-SrR
"S">#.L
totalCount, int startIndex){ JD\:bI
setPageSize(PAGESIZE); v{R:F
setTotalCount(totalCount); jh3LD6|s}
setItems(items); `7;I*|
setStartIndex(startIndex); D]I]I!2c
}
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public PaginationSupport(List items, int :&]THUw
. PzlhTL7
totalCount, int pageSize, int startIndex){ 2Z ?
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setPageSize(pageSize); dMA"% R
setTotalCount(totalCount); ~}SOd<n)|
setItems(items); UUxDW3K
setStartIndex(startIndex); ..ig jc#UF
} E&?z-,-o@
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publicList getItems(){ kUl:Yj=&
return items; nly`\0C
} o'W[v0>
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publicvoid setItems(List items){ ty8\@l
this.items = items; t/6t{*-w
} =uZOpeviQ
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publicint getPageSize(){ J,8Wo6
return pageSize; [WOLUb
} . Q#X'j
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publicvoid setPageSize(int pageSize){ LnN6{z{M
this.pageSize = pageSize; hL\gI(B
} HiBw==vlV
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publicint getTotalCount(){ uZyR{~-C
return totalCount; VfJbexYT
} i;1EXM
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publicvoid setTotalCount(int totalCount){ [l+1zt0w0
if(totalCount > 0){ sK#)wjj\^
this.totalCount = totalCount; 1 :xN )M,s
int count = totalCount / +^St"GWY
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pageSize; @K 8sNPK
if(totalCount % pageSize > 0) d83K;Ryd
count++; zc<C %t[~y
indexes = newint[count]; ^
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for(int i = 0; i < count; i++){ ,g R9~k,
indexes = pageSize * *k$ ":A
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i; p^G:h6|+|
} ^&o38=70*
}else{ =] R_6#
this.totalCount = 0; =[O;/~J%:
} axTvA(k9
} k+^-;=u6<
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publicint[] getIndexes(){ MZt~
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return indexes; wIW]uo/=
} u S$:J:Drx
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publicvoid setIndexes(int[] indexes){ @"*8nV#
this.indexes = indexes; x(e=@/qp
} LB<,(dyh
l
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publicint getStartIndex(){ WJG& `PP
return startIndex; L< MIl[z7
} EJ*
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publicvoid setStartIndex(int startIndex){ M(,npW
if(totalCount <= 0) *D: wwJ
this.startIndex = 0; :les
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elseif(startIndex >= totalCount) q?x.P2
this.startIndex = indexes *QzoBpO<
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[indexes.length - 1]; b|i94y(
elseif(startIndex < 0) zOR
this.startIndex = 0; <r*A(}Y
else{ pN+lC[C
this.startIndex = indexes /aepE~T
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[startIndex / pageSize]; )v!>U<eprD
} D`=hP(y^
} ,+0>p
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publicint getNextIndex(){ qMAH~P0u
int nextIndex = getStartIndex() + ;c5Q"
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pageSize; ?]S!-6:
if(nextIndex >= totalCount) pKrol]cth8
return getStartIndex(); O!!Ne'I
else \-mz[<ep
return nextIndex; ,:!X]F#d$
} kc d~`+C
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publicint getPreviousIndex(){ ;!(.hCHvr
int previousIndex = getStartIndex() - ;J3az`
IrU}%ZVV
pageSize; x\vb@!BZ
if(previousIndex < 0) Wq!n8O1
return0; gt5
else JFx=X=C
return previousIndex; $x&\9CRM
} |BD]K0
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} V~y4mpfX
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抽象业务类 v%|()Z0
java代码: 2nOoG/6
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/** lgC|3]
* Created on 2005-7-12 J7R+|GTcx
*/ *pN,@ZV$
package com.javaeye.common.business; RltG/ZI
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import java.io.Serializable; C[$uf
import java.util.List; )1H$5h
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import org.hibernate.Criteria; ^Bihm] Aq
import org.hibernate.HibernateException; `F:PWG`
import org.hibernate.Session; 8S1%;@c
import org.hibernate.criterion.DetachedCriteria; %gB 0\C
import org.hibernate.criterion.Projections; Z']D8>d
import YcS}ug7
}Y(yDg;"
org.springframework.orm.hibernate3.HibernateCallback; 3Q^@!hu
import B$b'bw.
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org.springframework.orm.hibernate3.support.HibernateDaoS !*wK4UcX"
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upport; %J\1W"I?
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import com.javaeye.common.util.PaginationSupport; <o5+*X
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public abstract class AbstractManager extends 5B{O!SNd
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HibernateDaoSupport { _p vL b
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privateboolean cacheQueries = false; $smzP.V
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privateString queryCacheRegion; 2 @g'3M
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publicvoid setCacheQueries(boolean ]@bo; .
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cacheQueries){ Sk@~}
this.cacheQueries = cacheQueries; Fl GKy9k
} %p?u
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publicvoid setQueryCacheRegion(String 2~+Iu+
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queryCacheRegion){ 28M!G~|
this.queryCacheRegion = w/s{{X<bF
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queryCacheRegion; }et^'BkA(
} 'sI= *c
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publicvoid save(finalObject entity){ G0$
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getHibernateTemplate().save(entity); /OaLkENgvf
} VmrW\rH@
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publicvoid persist(finalObject entity){ F7^d@hSV
getHibernateTemplate().save(entity); `zAo IQ
} j3F[C:-zY
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publicvoid update(finalObject entity){ v"Bv\5f,Ys
getHibernateTemplate().update(entity); +0;n t
} F(/^??<5
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publicvoid delete(finalObject entity){ aX6.XHWbDf
getHibernateTemplate().delete(entity); NL))!Pi
} Zk2-U"0\o
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publicObject load(finalClass entity, u2'xM0nQ
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finalSerializable id){ zEJ|;oL
return getHibernateTemplate().load r'fNQJ >
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(entity, id); ;<%~g8:XL
} C\UD0r'p?
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publicObject get(finalClass entity, .EGZv(rz&
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finalSerializable id){ ^<xpp.eY
return getHibernateTemplate().get HS| &["
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(entity, id); .Vq-<c%
} XXacWdh \
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publicList findAll(finalClass entity){ $Y][-8{t
return getHibernateTemplate().find("from 2#5SI
<R}(UK
" + entity.getName()); [|V<e+>T/
} +2`RvQN
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publicList findByNamedQuery(finalString l"!.aIY"e
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namedQuery){ j&)+qTV
return getHibernateTemplate MT BN&4[
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().findByNamedQuery(namedQuery); Z2`(UbG}
} u*Eb4
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publicList findByNamedQuery(finalString query, LX4S}QXw
& :x_
finalObject parameter){ S/]2Qt#T
return getHibernateTemplate erYpeq.
WcAX/<Y >
().findByNamedQuery(query, parameter); -uenCWF\#
} (4n 8[
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publicList findByNamedQuery(finalString query, #Zk6
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finalObject[] parameters){ Ll lyx20U
return getHibernateTemplate PMjqcdBzm
fZH:&EP
().findByNamedQuery(query, parameters); Q&^ti)vB
} ]H) x
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publicList find(finalString query){ 5YMjvhr?W
return getHibernateTemplate().find ` :Am#"j]}
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(query); Xm*gH, '
} ~c,HE] B
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publicList find(finalString query, finalObject
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parameter){ cD
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return getHibernateTemplate().find [F%INl-sy
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(query, parameter); dGf{d7 D
} G%-[vk#]
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public PaginationSupport findPageByCriteria Uaog_@2n,
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(final DetachedCriteria detachedCriteria){ B.6gJ2c
return findPageByCriteria 2ksX6M3kY
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ]wWN~G)2lV
} `omZ'n)
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public PaginationSupport findPageByCriteria xRq|W4ay
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(final DetachedCriteria detachedCriteria, finalint PYPs64kNC]
!]7Z),s
startIndex){ Vq2d+
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return findPageByCriteria E(*RtOC<W
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(detachedCriteria, PaginationSupport.PAGESIZE, 3i=+ [
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startIndex); m^@,0\F
} c?"#x-<1s
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public PaginationSupport findPageByCriteria
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(S* T{OgO
(final DetachedCriteria detachedCriteria, finalint ie{9zO<d
6%~ Z^>`N
pageSize, q3TAWNzI0
finalint startIndex){ v1<3y~'f
return(PaginationSupport) M%5qx,JQY
nAG2!2_8
getHibernateTemplate().execute(new HibernateCallback(){ R2yiExw<
publicObject doInHibernate (e6JI]tz{
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(Session session)throws HibernateException { Tn<
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Criteria criteria = uV`r_P
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detachedCriteria.getExecutableCriteria(session); ='a[(C&Y
int totalCount = @v\Osp t=
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((Integer) criteria.setProjection(Projections.rowCount thIuK V{CO
pca `nN!
()).uniqueResult()).intValue(); t J
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criteria.setProjection /]=Ih
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(null); A}?n.MAX>
List items = zs:OHEZw
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criteria.setFirstResult(startIndex).setMaxResults P!3)-apP\
HWOs
(pageSize).list(); DKnjmZ:J|
PaginationSupport ps = RTHD2
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new PaginationSupport(items, totalCount, pageSize, SB0Cq
=7wI/5iN
startIndex); CtJ*:wF
return ps; rrbD0UzFA
} pyYm<dn
}, true); SDt)|s
} 0Am&:kX't
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public List findAllByCriteria(final m1H_kJ
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DetachedCriteria detachedCriteria){ "c` $U]M%
return(List) getHibernateTemplate _ dEc? R}
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().execute(new HibernateCallback(){ /I}#0}
publicObject doInHibernate :_V9Jwu
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(Session session)throws HibernateException { Evu`e=LaG
Criteria criteria = ,|6O}E&
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li!.(b
detachedCriteria.getExecutableCriteria(session); k%Dpy2uH
return criteria.list(); nb
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} l{ <+V)
}, true); 7.mY@
} CAg~K[
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public int getCountByCriteria(final 9oBK(Sf@^
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DetachedCriteria detachedCriteria){ MIma:N_c
Integer count = (Integer) UtPFkase
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getHibernateTemplate().execute(new HibernateCallback(){ uqy&PS
publicObject doInHibernate 3kfrOf.4h
NV\t%/ ?
(Session session)throws HibernateException { N$]B$vv
Criteria criteria = ehCGu(=
)N$T&
detachedCriteria.getExecutableCriteria(session); xe?!UCUb@
return VF[$hs
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criteria.setProjection(Projections.rowCount !jlLF:v|1A
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()).uniqueResult(); l@:Tw.+/9
} E$l 4v>iA
}, true); -wn,7;
return count.intValue(); ^f6pw!
} ov;1=M~RF
} mD@*vq
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用户在web层构造查询条件detachedCriteria,和可选的 }@6Tcn1
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 6[+@#IWx
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PaginationSupport的实例ps。 +/O3L=QyJ
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ps.getItems()得到已分页好的结果集 _EPfeh;
ps.getIndexes()得到分页索引的数组 ;::]R'F[
ps.getTotalCount()得到总结果数 |m{u]9
ps.getStartIndex()当前分页索引 zm>^!j
!
ps.getNextIndex()下一页索引 rfo7\'yk
ps.getPreviousIndex()上一页索引 m&S *S_c
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Ymvd3> _
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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 \-?0ab3Z
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一下代码重构了。 ;f?suawMv
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我把原本我的做法也提供出来供大家讨论吧: c'|](vOd]
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首先,为了实现分页查询,我封装了一个Page类: i,V,0{$
java代码: =D~>$Y
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/*Created on 2005-4-14*/ nh
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package org.flyware.util.page; 7q%xF#mK=
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/** 52,[dP,g
* @author Joa Am
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* B,S~Idr}
*/ bZ0{wpeK=
publicclass Page { C))x#P36
;_X2E~i[
/** imply if the page has previous page */ sHqa(ynK
privateboolean hasPrePage; !jWE^@P/B
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/** imply if the page has next page */ %_@T'!]
privateboolean hasNextPage; c7~'GXxQ2
U9"(jl/o
/** the number of every page */ C'7DG\pr
privateint everyPage; r'(*#
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/** the total page number */ c_4K
privateint totalPage; rnyXMt.q
;rRV=$y
/** the number of current page */ 38mC+%iC
privateint currentPage; b#nI#!p'
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/** the begin index of the records by the current $c{fPFe-
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query */ }el7@Gv
privateint beginIndex; Xj9\:M-
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${)oi:K@:
/** The default constructor */ 5pT8 }?7
public Page(){ p'`?CJq8
PrHoN2y5E
} lqTc6@:D
r2*8.j51
/** construct the page by everyPage \,xa_zeO
* @param everyPage H+{@VB
* */ hd*GDjmRQ/
public Page(int everyPage){ B:Y F|k}T
this.everyPage = everyPage; [ $5u:*
} 9Nw&l@
n$ rgJ
/** The whole constructor */ Xub*i^(]
public Page(boolean hasPrePage, boolean hasNextPage, b:5-0uxjs
jM}(?^@
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int everyPage, int totalPage, '%X29B5
int currentPage, int beginIndex){ >4#:qIU
this.hasPrePage = hasPrePage; #w3J+U 6r
this.hasNextPage = hasNextPage; ;}Ei #T,D
this.everyPage = everyPage; ",xTgB3?V
this.totalPage = totalPage; f(G1xw]]@Y
this.currentPage = currentPage; c@2a)S8Y]
this.beginIndex = beginIndex; G@KDRv
} fG d1
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/** 9
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* @return u`ryCZo#g
* Returns the beginIndex. k;B[wEW@
*/ ]$uC~b
publicint getBeginIndex(){ + ZKU2N*
return beginIndex; jOU99X\0
} ;X^#$*=Q
h'HI92; [
/** DcNp-X40I
* @param beginIndex kY?tUpM!TB
* The beginIndex to set. .{t*v6(TP
*/
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publicvoid setBeginIndex(int beginIndex){ Z3yy(D>*
this.beginIndex = beginIndex; UEx13!iFo
} 1>uAVPa
-g."{|
/** TQu.jC
* @return HC}vO0X4
* Returns the currentPage. \HIBnkj)3n
*/ !?>QN'p.b
publicint getCurrentPage(){ vV xw*\`<6
return currentPage; 74ho=
} Q}G2f4
@ x .`z
/** ;Xf1BG r
* @param currentPage c`/VYgcTqB
* The currentPage to set. soLW'8
*/ q9dplEe5
publicvoid setCurrentPage(int currentPage){ {i+
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this.currentPage = currentPage; s=]NKJaQH
} b*Q3j}c Z
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/** D;s%cL`
* @return `#'j3,\6
* Returns the everyPage. wAw1K 2d
*/ .'&pw}F
publicint getEveryPage(){ c:e3hJ
return everyPage; }`2a>N:
&
} Z;V(YK(WO.
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/** ">G*hS
* @param everyPage t=X=",)f
* The everyPage to set. HE35QH@/`
*/ `<|tC#<z
publicvoid setEveryPage(int everyPage){ :._Igjj$=
this.everyPage = everyPage; z"T+J?V/
} sfip AM
qFK.ULgP`
/** ht*(@MCr<
* @return \i/HHP[%
* Returns the hasNextPage. ~&<t++ g
*/ =
publicboolean getHasNextPage(){ IA<>+NS
return hasNextPage; vQ*RrHG?c
} `kJ)E;v;3
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/** ^8EW/$k
* @param hasNextPage xxyc^\$
* The hasNextPage to set. $cK}Tlq
*/ A
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publicvoid setHasNextPage(boolean hasNextPage){ :{N*Z }]
this.hasNextPage = hasNextPage; U#cGd\b
} 'iF%mnJ
f]#\&"
/** u178vby;l
* @return D{s87h
* Returns the hasPrePage. i%!<6K6UT
*/ pHoHngyi&
publicboolean getHasPrePage(){ r-wCAk}m*?
return hasPrePage; %'ah,2a%
} '5Yzo^R;
f*<Vq:N=\
/** F{;#\Ob
* @param hasPrePage (BPO*'
* The hasPrePage to set. ~CT]&({
*/ >G8I X^*sG
publicvoid setHasPrePage(boolean hasPrePage){ AwXzI;F^
this.hasPrePage = hasPrePage; L'r&'y[
} z?<B@\~
lHtywZ@%3
/** rbnAC*y8'L
* @return Returns the totalPage. %SOXw8-
* r@}`Sw]@
*/ t 8 6w&
publicint getTotalPage(){ >vp4R`
return totalPage; LT<2 n.S
} >#$SaG!
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/** e,epKtL
* @param totalPage VS/M@y_./
* The totalPage to set. W]#w4Fp!
*/
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publicvoid setTotalPage(int totalPage){ u+Ix''Fn#%
this.totalPage = totalPage; dkz%
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} uUg;v/:
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} L&DjNu`!9
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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 &RYdSXM
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个PageUtil,负责对Page对象进行构造: E+i*u
java代码: z'm}p
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/*Created on 2005-4-14*/ _i {Y0d+
package org.flyware.util.page; zawu(3?~)5
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:
import org.apache.commons.logging.Log; !nSa4U,$w<
import org.apache.commons.logging.LogFactory; 8j;Un]
M i& ;1!bg
/** {/]2~!
* @author Joa JY2<ECO
* P !i_?M
*/ ;Y\LsmZ;F
publicclass PageUtil { >^~^#MT
@w8}]S
privatestaticfinal Log logger = LogFactory.getLog w2.]
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.qSDe+A
(PageUtil.class); M!'d
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/** ^AH[]sE_
* Use the origin page to create a new page gLX<>|)*
* @param page x|a&wC2,{
* @param totalRecords iT
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* @return Z?{\34lPj
*/ 6ieul@?*u*
publicstatic Page createPage(Page page, int uC;_?Bve
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totalRecords){ MvpJ0Y (
return createPage(page.getEveryPage(), o6MFMA+vi
d}4NL:=&
page.getCurrentPage(), totalRecords); t|i NSy3
} OF7hp5
SvM\9
/** qUd7O](b=?
* the basic page utils not including exception AB'+6QU9k
!^%3
handler QEs$9a5TE
* @param everyPage rJ Jx8)M
* @param currentPage #gQn3.PX+y
* @param totalRecords ByY2KJ7
* @return page RqTO3Kf
*/ 8TFQ%jv
publicstatic Page createPage(int everyPage, int gS'{JZu2
9,'m,2%W
currentPage, int totalRecords){ Qb^G1#r@C
everyPage = getEveryPage(everyPage); $Aw@xC^!
currentPage = getCurrentPage(currentPage); |T6K?:U7
int beginIndex = getBeginIndex(everyPage, [Kwj
7q`
JJd qdX;
currentPage); RRt(%Wm*
int totalPage = getTotalPage(everyPage, &YXJ{<s
"tCTkog3]
totalRecords); WiytHuUF
boolean hasNextPage = hasNextPage(currentPage, PT2;%=f
L(TM&
ps\-
totalPage); P~trxp=k
boolean hasPrePage = hasPrePage(currentPage); rw'+2\
0SL{J*S4[#
returnnew Page(hasPrePage, hasNextPage, v8ap"9b
everyPage, totalPage, lD,2])>
currentPage, J 6KHc^,7
*DPX4P
beginIndex); 8 ??-H0P
} a&_