Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 H^vA}F`
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Xn>>hzj-x?
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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 .RyuWh!5
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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 ( )f)
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分页支持类: ~&+ a.@T
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java代码: iOL/u)
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package com.javaeye.common.util; MD3iWgM
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import java.util.List; v!$?;"d+
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publicclass PaginationSupport { @Pi]kWW})
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publicfinalstaticint PAGESIZE = 30; .[3C
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privateint pageSize = PAGESIZE; 5w+&plIJ
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privateList items; kLpq{GUv:
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privateint totalCount; $xF[j9nM
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privateint[] indexes = newint[0]; _+~&t9A!
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privateint startIndex = 0; JZE@W-2
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public PaginationSupport(List items, int [,MK)7DU
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totalCount){ tF./Jx]_
setPageSize(PAGESIZE); 9\=SG"e(
setTotalCount(totalCount); cqW(9A|8
setItems(items); ZPz=\^
setStartIndex(0); !41"`D!1
} [;ZC_fD
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public PaginationSupport(List items, int _>?.MUPB
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totalCount, int startIndex){ 4 ?[1JN>
setPageSize(PAGESIZE); joZd
setTotalCount(totalCount); 4Tx.|
setItems(items);
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setStartIndex(startIndex); V7O7"Q^q
} /^bU8E&^M
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public PaginationSupport(List items, int g-NrxyTBlx
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totalCount, int pageSize, int startIndex){ Iek]/=
setPageSize(pageSize); %T\2.vl
setTotalCount(totalCount); J8Vzf$t};
setItems(items); Gi2Fjq/Y
setStartIndex(startIndex); *Tr{a_{~C
} ?8U]UM6Tu4
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publicList getItems(){ EQ|Wke
return items; Dk8@x8
} Kxz|0l
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publicvoid setItems(List items){ G|"m-.9F
this.items = items; UISsiiG(
} #uCfXJ-
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publicint getPageSize(){ yF|+oTp
return pageSize; hJz]N$@W
} OK47Q{.gh
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publicvoid setPageSize(int pageSize){
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this.pageSize = pageSize; -dfs8 [i
} aVr =7PeF
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publicint getTotalCount(){ \~zm_-Hw@Y
return totalCount; {k[dg0UV
} 4Mt RI
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publicvoid setTotalCount(int totalCount){ E&U_@ bc-
if(totalCount > 0){ P_75-0G
this.totalCount = totalCount; i*A_Po
int count = totalCount / bqx2lQf,_
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pageSize; ,]das
if(totalCount % pageSize > 0) _Vt(Eg_\
count++; yUO%@;
indexes = newint[count]; Uty0mc(
for(int i = 0; i < count; i++){ >$=l;jO`n
indexes = pageSize * {G<1.
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i; 1F3Q^3+
} YNKvR
}else{ y|3("&)"S
this.totalCount = 0; zG^$-L.n
} 4%JJ}{Ff
} UQ@szE
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publicint[] getIndexes(){ u|D L?c>W
return indexes; E]r<t#
} qG g2 9
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publicvoid setIndexes(int[] indexes){ n1PvZ~^3
this.indexes = indexes; VRSBf;?
} *m`x/_y+
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publicint getStartIndex(){ lk
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return startIndex; ua_,c\iL
} W%o! m,zFM
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publicvoid setStartIndex(int startIndex){ *Gj`1#Z$
if(totalCount <= 0) Ag8lI+
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this.startIndex = 0; :/t_5QN
elseif(startIndex >= totalCount) 8|5+\1!#/)
this.startIndex = indexes 6Lg#co}9
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[indexes.length - 1]; 0V`~z-#
elseif(startIndex < 0) F|o1r
this.startIndex = 0; NdXC8
else{ R9QW%!:,\2
this.startIndex = indexes d5R2J:dI
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[startIndex / pageSize]; mC?}:WM@
} 1|:;~9n<t
} uX&h~qE/
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publicint getNextIndex(){ 2^:iU{
int nextIndex = getStartIndex() + t2rZ%[O
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pageSize; &4l!2
if(nextIndex >= totalCount) [MKt\(
return getStartIndex(); +"~*L,ken0
else 0 wDhX
return nextIndex; 1(%6X*z
} Ub4)x
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publicint getPreviousIndex(){ [ lK`~MlQ
int previousIndex = getStartIndex() - Q7/Jyx|
bBGg4{
pageSize; 7_rDNK@e
if(previousIndex < 0) u
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return0; .SOCWznb
else |W&K@g$
return previousIndex; =GeGlI6
} z=8l@&hYLq
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} !<b+7A
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抽象业务类 /sPa$D
java代码: ]g,j
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/** %>y!N!.F
* Created on 2005-7-12 VMNdC}
*/ Y$+v "
package com.javaeye.common.business; 2^U?Ztth6
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import java.io.Serializable; l-Dg m
import java.util.List; ??++0<75
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import org.hibernate.Criteria; <7/7+_y
import org.hibernate.HibernateException; 0G+qF96
import org.hibernate.Session; qP=a:R-
import org.hibernate.criterion.DetachedCriteria; T?`Ha\go
import org.hibernate.criterion.Projections; zn|O)"C
import z:)*Aobwv
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org.springframework.orm.hibernate3.HibernateCallback; {?X +Yw
import
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org.springframework.orm.hibernate3.support.HibernateDaoS %z"$?Iv
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upport; kY'C'9p
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import com.javaeye.common.util.PaginationSupport; $d&7q5[
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public abstract class AbstractManager extends 7~QAprwVS
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HibernateDaoSupport { ~uB@o KMru
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privateboolean cacheQueries = false; A$;*O)
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privateString queryCacheRegion; [RTo[-ci2
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publicvoid setCacheQueries(boolean e%0IEX
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cacheQueries){ 6QP T
this.cacheQueries = cacheQueries; B>cx[.#!
} x@>~&eP
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publicvoid setQueryCacheRegion(String N;=J)b|9
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queryCacheRegion){ 8Kn}o@Yd
this.queryCacheRegion = ogya~/
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queryCacheRegion; $ylxl"Y
} +hlR
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publicvoid save(finalObject entity){ R m2M
getHibernateTemplate().save(entity); n~i^+pD@
} ;B:\e8
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publicvoid persist(finalObject entity){ YC*`n3D|'
getHibernateTemplate().save(entity); !Uhc jfq`e
} X-j<fX_
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publicvoid update(finalObject entity){ 1d&Q
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getHibernateTemplate().update(entity); qs9r$o.\l
}
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publicvoid delete(finalObject entity){ NpA%7Q~B$,
getHibernateTemplate().delete(entity); i2LN`5k
} 5iGz*_
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publicObject load(finalClass entity, s:tWEgZk?
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finalSerializable id){ V9`jq$
return getHibernateTemplate().load &Mz.i,Gh
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(entity, id); sq8O+AWl
} h{?f
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publicObject get(finalClass entity, H;FzWcm
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finalSerializable id){ F-Ku0z]){?
return getHibernateTemplate().get *kJa$3*r
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(entity, id); ,%y!F3m
} Jf@Xz7{z
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publicList findAll(finalClass entity){ =Q!V6+}nY^
return getHibernateTemplate().find("from 2k`Q+[?{q>
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" + entity.getName()); 8,B#W#*{
} G/KTF2wl7
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publicList findByNamedQuery(finalString 2nSz0 .
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namedQuery){ 6(q8y(.`
return getHibernateTemplate fs#9*<]m
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().findByNamedQuery(namedQuery); @ZcI]G%
} !zfV(&
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publicList findByNamedQuery(finalString query, O%Qz6R
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finalObject parameter){ |j$$0N
return getHibernateTemplate 8:
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().findByNamedQuery(query, parameter); N,ZmGzNP)
} RRGs:h@;
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publicList findByNamedQuery(finalString query, u>2opI~m
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finalObject[] parameters){ m2F+6G
return getHibernateTemplate ^3Z~RK\}
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().findByNamedQuery(query, parameters); X>MDX.Z
} *o=( w5
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publicList find(finalString query){ <mQ9YO#
return getHibernateTemplate().find &tlU.Whk+
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(query); z*N%kcw"
} Z$K[e
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publicList find(finalString query, finalObject $oi8<8Y
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parameter){ 08nA}+k
return getHibernateTemplate().find D#X&gE
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(query, parameter); H*&!$s.
} }wGy#!CSza
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public PaginationSupport findPageByCriteria [iN\R+:
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(final DetachedCriteria detachedCriteria){ sg_%=;
return findPageByCriteria 9]a!1
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); H$xUOqL
} =K9-
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public PaginationSupport findPageByCriteria @P<Mc)o^
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(final DetachedCriteria detachedCriteria, finalint G}'\
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startIndex){ ]Q{MF- EKj
return findPageByCriteria <+ckE2j
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(detachedCriteria, PaginationSupport.PAGESIZE, G 2FD'Sf
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startIndex); PE2O$:b\
} U~<~>^[
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public PaginationSupport findPageByCriteria w?M` gl8r
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(final DetachedCriteria detachedCriteria, finalint !JPZ7_nn
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pageSize, uBo~PiJ2"
finalint startIndex){ #!]~E@;E
return(PaginationSupport) OH vV_
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getHibernateTemplate().execute(new HibernateCallback(){ ljk,R
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publicObject doInHibernate B..> *Xb
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(Session session)throws HibernateException { @}A3ie'w
Criteria criteria = uSNlI78D
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detachedCriteria.getExecutableCriteria(session); ~G8haN4
int totalCount = <f@
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((Integer) criteria.setProjection(Projections.rowCount O[HBw~
7u[$
()).uniqueResult()).intValue(); lBOxB/`
criteria.setProjection ?xzDz
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(null); r?=3TAA
List items = nb U?:=P
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criteria.setFirstResult(startIndex).setMaxResults 4Kn)5>
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(pageSize).list(); Z(o]8*;Ai
PaginationSupport ps = DM*u;t{i
3qrjb]E%}
new PaginationSupport(items, totalCount, pageSize, a*Ng+~5)6
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startIndex); *!yY7 ~#
return ps; 604^~6
} C)+%9Edg
}, true); !R1OSVFp
} w:@W/e*9N
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public List findAllByCriteria(final UJrN+RtL
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DetachedCriteria detachedCriteria){ #:}mi;{
return(List) getHibernateTemplate (Z at|R.F
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().execute(new HibernateCallback(){ 9I*`~il>{
publicObject doInHibernate NpF)|Ppb{
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(Session session)throws HibernateException { 5t[7taLX\
Criteria criteria = ya/pn
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detachedCriteria.getExecutableCriteria(session); @z7$1pl}
return criteria.list(); .jbT+hhM
} qJ<Ghd`8v
}, true); ZTK)N
} ^h"F\vIpV
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public int getCountByCriteria(final (Ei} :6,}
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DetachedCriteria detachedCriteria){ cW\Y1=Gv|
Integer count = (Integer) &W-1W99auE
S *K0OUq
getHibernateTemplate().execute(new HibernateCallback(){ qiyJ4^1
publicObject doInHibernate Pxe7 \e
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(Session session)throws HibernateException { yI_MYL[
Criteria criteria = XQ$9E?|=
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detachedCriteria.getExecutableCriteria(session); |NXe{q7{
return +{"w5o<CO
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criteria.setProjection(Projections.rowCount I"r[4>>B>0
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()).uniqueResult(); EMMp4KKOx+
} K.: :P84m;
}, true); 3B[u2o>
return count.intValue(); ;$rh&ET
} )dZ1$MC[
} 3C(V<R?
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用户在web层构造查询条件detachedCriteria,和可选的 &=hkB9
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 n%={!WD
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PaginationSupport的实例ps。 `& }C*i"
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ps.getItems()得到已分页好的结果集 cK~VNzsz
ps.getIndexes()得到分页索引的数组 T,fDH!a
ps.getTotalCount()得到总结果数 U~YjTjbd
ps.getStartIndex()当前分页索引 yh"48@L'D
ps.getNextIndex()下一页索引 pl5Q2zq%
ps.getPreviousIndex()上一页索引 pJPP6Be<
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 m005*>IY
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 P'D'+qS
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一下代码重构了。 BF+i82$zo
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我把原本我的做法也提供出来供大家讨论吧: ck K9@RQ
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首先,为了实现分页查询,我封装了一个Page类: l6k.`1.In
java代码: N2e]S8-
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/*Created on 2005-4-14*/ `Uy'YfYF
package org.flyware.util.page; &Y|AX2KUC
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/** +U*:WKdI?
* @author Joa fD ?w!7f-1
* Jw)-6WJ!uO
*/ }@Ou]o
publicclass Page { >'|Wrz67Z
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/** imply if the page has previous page */ z2cd1HxN
privateboolean hasPrePage; %8~g#Z
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t1
/** imply if the page has next page */ H=(Zx
privateboolean hasNextPage; |FH|l#bu>
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/** the number of every page */ A_JNj8<6r
privateint everyPage; ipn0WQG
#x[3@zP.
/** the total page number */ <)ltvo(
privateint totalPage; T~b6Zu6
%P`w"H,v3#
/** the number of current page */ Jyo(Etp
privateint currentPage; =%oQIx
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/** the begin index of the records by the current "%]vSr
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query */ A,#a?O6m
privateint beginIndex; ;;lOu~-*$p
l
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/** The default constructor */ h;S?
public Page(){ Kuy0Ci
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} Y[Kpd[)[v
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/** construct the page by everyPage mv\S1[<T
* @param everyPage 9 7Mi{Zz
* */ 1JWo~E'
public Page(int everyPage){ ^P}c0}^
this.everyPage = everyPage; NG?- dkD
} bbxo!K
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/** The whole constructor */ gzeTBlXg
public Page(boolean hasPrePage, boolean hasNextPage, Lm"zW>v
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int everyPage, int totalPage, z]bcg$m
int currentPage, int beginIndex){ =Xh*w
this.hasPrePage = hasPrePage; $61j_;WF`
this.hasNextPage = hasNextPage; A~%h*nZc%I
this.everyPage = everyPage; +w'He9n
this.totalPage = totalPage; %m?$"<q_K
this.currentPage = currentPage; ]iE)8X
this.beginIndex = beginIndex; ISALR{Aq
} Z@ZSn0
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/** ^b@&O-&s
* @return o0\d`0-el
* Returns the beginIndex. 2V)qnMxAZJ
*/ j2%?-(U
publicint getBeginIndex(){ i*2l4
return beginIndex; (4oO8aBB
} #xBh62yIuP
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/** 8xQjJ
* @param beginIndex K6M_b?XekA
* The beginIndex to set. p{S#>JTr
*/ k$v8cE
publicvoid setBeginIndex(int beginIndex){ 6;{E-y
this.beginIndex = beginIndex; AxZaV;%*
} 3}ATt".
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/** CGY,I
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* @return Xw_6SR9C
* Returns the currentPage. f5dctDHP
*/ +!Lz]@9K
publicint getCurrentPage(){ iDrQ4>
return currentPage; Y4)v>&H
} .BjnV%l7Id
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/** TDR2){I
* @param currentPage (Q~(t
* The currentPage to set. 6*tbil_G+
*/ &=`6- J
publicvoid setCurrentPage(int currentPage){ z)0%gd|
this.currentPage = currentPage; $mLiEsJ
} v7@O ,%
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/** IM$I=5ye
* @return C3GI?|b
* Returns the everyPage. }j6<S-s~
*/ gi5Ffvs$
publicint getEveryPage(){ d6ABgQi0
return everyPage; gPzp/I
} 9Ls=T=96
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/** |dI,4Z\Qb
* @param everyPage #,PB(
* The everyPage to set. fw+ VR.#2H
*/ X'XH-E
publicvoid setEveryPage(int everyPage){ k*Vf2O3${
this.everyPage = everyPage; "'\f?A9
} XX|wle1Kg
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/** vg ^&j0
* @return y&{ Z"+B5
* Returns the hasNextPage. d 0CFMy6
*/ Od@<L
publicboolean getHasNextPage(){ ^#)M,.G^
return hasNextPage; }}MZgm~U)
} ct-;L' a
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/** %x zgTZ
* @param hasNextPage 5X=ik7m^
* The hasNextPage to set. @#W$7Gwf0
*/ 8bP4
publicvoid setHasNextPage(boolean hasNextPage){ >
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this.hasNextPage = hasNextPage; 9a;8^?Ld%S
} &nX,)"
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/** t?404
* @return Xsit4Ma
* Returns the hasPrePage. 4[^lE?+
*/ >W7IWhm3
publicboolean getHasPrePage(){ Wk*t-
return hasPrePage; _E<