Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 /+>)"D6'
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ZAMeqPt
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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 F "!agc2!
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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 yH*hL0mO
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分页支持类: $0_^=DEW
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java代码: M|d={o9Hp
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package com.javaeye.common.util; ~e{H#*f&1/
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import java.util.List; d^PD#&"g
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publicclass PaginationSupport { S@x}QQ|.
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publicfinalstaticint PAGESIZE = 30; C;9t">prk
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privateint pageSize = PAGESIZE; WE0}$P:
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privateList items; te i`/
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privateint totalCount; nP<S6:s:
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privateint[] indexes = newint[0]; q(78fZ *X
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privateint startIndex = 0; Q
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public PaginationSupport(List items, int k0L] R5W
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totalCount){ Y(_KizBY
setPageSize(PAGESIZE); P|N2R5(>T
setTotalCount(totalCount); G8eD7%{b:)
setItems(items); zCt\o
setStartIndex(0); ygN>"eP
} pV7N byb4
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public PaginationSupport(List items, int Ea-bC:>
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totalCount, int startIndex){ b^x07lO
setPageSize(PAGESIZE); Y&K <{\vE
setTotalCount(totalCount); @xS]!1-
setItems(items); [F+,YV%t
setStartIndex(startIndex); _-O cc=Z
} b._m 8z ~
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public PaginationSupport(List items, int YGp)Oy}:
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totalCount, int pageSize, int startIndex){ `N}d}O8
setPageSize(pageSize); S/.^7R7{f
setTotalCount(totalCount); oaK.kOo
setItems(items); JEhm1T
setStartIndex(startIndex); ,X68xk.'
} eCWPhB6l
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publicList getItems(){ sHdp
return items; _\\ -md:
} M(enRs3`O
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publicvoid setItems(List items){ id ?"PD"%
this.items = items; ?iv=53<c#
} :HRT 2I
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publicint getPageSize(){ dY!u)M;~~
return pageSize; 'N\&<dT>
} E)W@{?.o#
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publicvoid setPageSize(int pageSize){ <^8*<;PaG
this.pageSize = pageSize; T_LLJ}6M
} ~jN'J+_$
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publicint getTotalCount(){ <uci9- eC
return totalCount; 7&U&E|
} 6S1m<aH6
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publicvoid setTotalCount(int totalCount){ bMm3F%FFq&
if(totalCount > 0){ 'c %S!$P
this.totalCount = totalCount; F PR`tE
int count = totalCount / UV AJxqz%}
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pageSize; I[d]!YI}F
if(totalCount % pageSize > 0) <41ZZ0<EwY
count++; NmpnJu|8
indexes = newint[count]; fDh]tua
for(int i = 0; i < count; i++){ .tnkT;T
indexes = pageSize * ;a
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} z-r2!^q27
}else{ r2\c'9uH
this.totalCount = 0; -Q"hZ 9
} j}f[W [2
} HC*?DJ,
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publicint[] getIndexes(){ lG:kAtx4
return indexes; !L$x:/R9M
} ?X9UTOx
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publicvoid setIndexes(int[] indexes){ Z[?mc|*x
this.indexes = indexes; e,0-)?5R
} 3n]79+w@z
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publicint getStartIndex(){ nP3 E
return startIndex; t;NV $!!
} `yO'[2
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publicvoid setStartIndex(int startIndex){ rD
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if(totalCount <= 0) O_~7Glu
this.startIndex = 0; Yh<WA>=
elseif(startIndex >= totalCount) -_N)E ))G
this.startIndex = indexes ;9a 6pz<
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[]|
[indexes.length - 1]; %*}Y6tl '|
elseif(startIndex < 0) "ju'UOcS/
this.startIndex = 0; iE].&>w
else{ F@YKFk+a
this.startIndex = indexes BuOgOYh9
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[startIndex / pageSize]; EGVM)ur
} mtAE
} ?C-Towo=i
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publicint getNextIndex(){ kz}R[7
int nextIndex = getStartIndex() + U7h(`b
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pageSize; x;s0j"`Jb
if(nextIndex >= totalCount) lLhL`C!
return getStartIndex(); p'_%aVm7
else ULJ mSe
return nextIndex; o 5U(i
} X}ma]
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publicint getPreviousIndex(){ KLW n?`
int previousIndex = getStartIndex() - }_9,w;M$
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pageSize; =q7Z qP
if(previousIndex < 0) SRIA*M.B}
return0; {i0SS
else 'a6<ixgo0
return previousIndex; O^Q7b7}y
} nI.x
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} Q4*?1`IsR
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抽象业务类 Rhc-q|Lz8
java代码: #DU26nCL
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/** )Z 9E=%
* Created on 2005-7-12 8Me:Yp_Xt
*/ PXzsj.
package com.javaeye.common.business; *a;@*
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import java.io.Serializable; P262Q&.}d
import java.util.List; H,fZ!8(A_)
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import org.hibernate.Criteria; }/tf>?c
import org.hibernate.HibernateException; #'D"
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import org.hibernate.Session; ]V l]XT$Um
import org.hibernate.criterion.DetachedCriteria; vX0f,y
import org.hibernate.criterion.Projections; &s Pq<l o
import Z>c3
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org.springframework.orm.hibernate3.HibernateCallback; m7a#qs;,
import hI%bjuq
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org.springframework.orm.hibernate3.support.HibernateDaoS f"7O "6
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upport; IN8>ZV`j)
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import com.javaeye.common.util.PaginationSupport; 0.T4{JS#
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public abstract class AbstractManager extends lO&3{dOYE
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HibernateDaoSupport { gb
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privateboolean cacheQueries = false; ;<yd^Xs
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privateString queryCacheRegion; k.("3R6v:
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publicvoid setCacheQueries(boolean aRG2@5
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cacheQueries){ - p3Re9
this.cacheQueries = cacheQueries; Bjk]ZU0T
} A+6 n#
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publicvoid setQueryCacheRegion(String qmO6,T-|
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queryCacheRegion){ 8Ac)'2t;U
this.queryCacheRegion = Bm&kkx.9P
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queryCacheRegion; yjfat&$
} Eskb9^A
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publicvoid save(finalObject entity){ ~U;rw&'H
getHibernateTemplate().save(entity); 5N%93{L
} hxCvk/7sT
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publicvoid persist(finalObject entity){ B<j'm0a>B
getHibernateTemplate().save(entity); >e\9Bf_
} 3a.kBzus
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publicvoid update(finalObject entity){ 'F>'(XWWQ
getHibernateTemplate().update(entity);
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} ml \4xp,
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publicvoid delete(finalObject entity){ X[f=h=|
getHibernateTemplate().delete(entity); \j&^aAp r
} UnI48Y
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publicObject load(finalClass entity, $O9^SB
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finalSerializable id){ . e=C{
return getHibernateTemplate().load Cvn#=6V3
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(entity, id); \[Z?&
} zZVfj:i8
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publicObject get(finalClass entity, XC.%za8
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finalSerializable id){ =Zi2jL?On
return getHibernateTemplate().get jBegh9KHq
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(entity, id); _i/t?7
} _YF%V;X
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publicList findAll(finalClass entity){ 7Hm3;P.
return getHibernateTemplate().find("from (V4
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" + entity.getName()); xO-+i\ ZV
} y~)1
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publicList findByNamedQuery(finalString &^W|iXi#
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namedQuery){ =}.EY iD
return getHibernateTemplate m9/}~Y#k
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().findByNamedQuery(namedQuery); qK)73eNSR
} DZi!aJ
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publicList findByNamedQuery(finalString query, F&&$Qn_+
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finalObject parameter){ H,b5C_D29
return getHibernateTemplate @|\}.M<e*)
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().findByNamedQuery(query, parameter); }Hn/I,/
} k{'0[,mx#
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publicList findByNamedQuery(finalString query,
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finalObject[] parameters){ y- 1 pR
return getHibernateTemplate j$+nKc$
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().findByNamedQuery(query, parameters); g1jTy7g?
} ~Q\3pI. |
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publicList find(finalString query){ ]MxC_V+P`
return getHibernateTemplate().find {7)st
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(query); Yl3n2R /U
} 5-M&5f.
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publicList find(finalString query, finalObject z_|/5$T>U
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parameter){ |o\8
return getHibernateTemplate().find y~FV2$
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(query, parameter); VY3&
} wu)w
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public PaginationSupport findPageByCriteria 1R,:
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(final DetachedCriteria detachedCriteria){ hRCed4qA
return findPageByCriteria m%76i;uP
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); dxmE3*b`
} !_"fP:T>
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public PaginationSupport findPageByCriteria Vv ?-"\Z>
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(final DetachedCriteria detachedCriteria, finalint jrS[f
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startIndex){ )'~6HO8Z
return findPageByCriteria ={z*akn,
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(detachedCriteria, PaginationSupport.PAGESIZE, -:na:Vsi
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startIndex); S;)w.
} 6Aku1h
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public PaginationSupport findPageByCriteria } q$ WvY/
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(final DetachedCriteria detachedCriteria, finalint (JM5`XwM
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pageSize, QDhOhGK
finalint startIndex){ JhLgCnm
return(PaginationSupport) AT%u%cE-
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getHibernateTemplate().execute(new HibernateCallback(){ @w?P7P<O`
publicObject doInHibernate #Jw1IcuH
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(Session session)throws HibernateException { C<P%CG&;
Criteria criteria = 2Tagr1L
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detachedCriteria.getExecutableCriteria(session); i(NdGL#P
int totalCount = fP.
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((Integer) criteria.setProjection(Projections.rowCount xLC3>>P
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()).uniqueResult()).intValue(); rsy'q(N[
criteria.setProjection 4B^ZnFJ%m
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(null); @g&ct>@y
List items = 8/=L2fNN[
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criteria.setFirstResult(startIndex).setMaxResults z[3L2U~6
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(pageSize).list(); r_-_a(1R:
PaginationSupport ps = {PVW D7
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new PaginationSupport(items, totalCount, pageSize, ,d {"m)r<
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startIndex); dfij|>:*0
return ps; 8]U{;|';
} RE/~#k@a
}, true); 1fZ(l"
} e=+?K5q{P(
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public List findAllByCriteria(final E<Q
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DetachedCriteria detachedCriteria){ U4b0*` o
return(List) getHibernateTemplate (w}H]LQ
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().execute(new HibernateCallback(){ <psZQdH
publicObject doInHibernate .n~M(59
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(Session session)throws HibernateException { j'HZ\_
Criteria criteria = Bq$rf < W
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detachedCriteria.getExecutableCriteria(session); D?NbW @]
return criteria.list(); #6CC3TJ'k
} /N&CaH\;^$
}, true); a+%6B_|\
} :(M(>4t
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public int getCountByCriteria(final !0vG|C;'
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DetachedCriteria detachedCriteria){ T-U}QM_e
Integer count = (Integer) 'LO^<
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getHibernateTemplate().execute(new HibernateCallback(){ 2fWTY0
publicObject doInHibernate `wDl<[V
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(Session session)throws HibernateException { -@0GcUE:r
Criteria criteria = x3o]U)^
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detachedCriteria.getExecutableCriteria(session); }<9cL'
return v%iof1 T'
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criteria.setProjection(Projections.rowCount "gDb1h)8
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()).uniqueResult(); osX8eX]\
} RsY3V=u
}, true); 'qOREN
return count.intValue(); }x07^4$j
} !qM=a3
} yFtd=AI'E
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用户在web层构造查询条件detachedCriteria,和可选的 %)0*&a 4
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 \E*d\hrl{
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PaginationSupport的实例ps。 id2j7|$,
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ps.getItems()得到已分页好的结果集 i5CK*"$Q
ps.getIndexes()得到分页索引的数组 CTZh0x
ps.getTotalCount()得到总结果数 U qFv}VsnF
ps.getStartIndex()当前分页索引 }wHW7SJ
ps.getNextIndex()下一页索引 6{^E{go
ps.getPreviousIndex()上一页索引 Is{KN!Hw
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 A*}.EClH
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 \kU &^Hi
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一下代码重构了。 <7j87
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我把原本我的做法也提供出来供大家讨论吧: WYEKf9}
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首先,为了实现分页查询,我封装了一个Page类: \<y#R~7s
java代码: dAkgR~
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/*Created on 2005-4-14*/ =Q+=
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package org.flyware.util.page; /7t>TYip!
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/** Ns7(j-
* @author Joa Q2F+?w;,
* o'f?YZ$.
*/ {:]9Q Tq
publicclass Page { e= .njMqW5
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/** imply if the page has previous page */ q(2K6
privateboolean hasPrePage; AigS!-
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/** imply if the page has next page */ I~Zh@d%
privateboolean hasNextPage; w6{TE(]zp
Y[$!`);Ye
/** the number of every page */ \8?Tdx=
privateint everyPage; a6WI170^1
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/** the total page number */ c%'RR?Tl
privateint totalPage; %|oJ>+
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/** the number of current page */ )`A3M)
privateint currentPage; :=/>Vbd: )
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/** the begin index of the records by the current [ji#U s:h
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query */ LS88.w\=S@
privateint beginIndex; Zy(W^~NT
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/** The default constructor */ fDvl/|62{
public Page(){ Db1pW=66:
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} cxr=k%~}J
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/** construct the page by everyPage I.94v
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* @param everyPage -U/c\-~fU
* */ tjluk
public Page(int everyPage){ A#95&kJpy
this.everyPage = everyPage; i* NH'o/
} Y[K*57fs
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/** The whole constructor */ "vyNxZE
public Page(boolean hasPrePage, boolean hasNextPage, 3T!lA
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int everyPage, int totalPage,
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int currentPage, int beginIndex){ $}jssnoU
this.hasPrePage = hasPrePage; YtfVD7m
this.hasNextPage = hasNextPage; <F=xtyl7
this.everyPage = everyPage; Gch[Otq]%
this.totalPage = totalPage; lo,$-bJ,<,
this.currentPage = currentPage; h_T7% #0
this.beginIndex = beginIndex; JaL%qco
} NwG= <U*
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/** G6FEp`
* @return Dqe^E%mc
* Returns the beginIndex. :"IE
*/ \8 h;K>=h
publicint getBeginIndex(){ eK!V
);
return beginIndex; IuRmEL_Q_
} [ zEUH:9D
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/** ?Vdia:
* @param beginIndex 52,m:EhL
* The beginIndex to set. 0 SNIYkGE
*/ I{*<